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2013 Vol. 35, No. S1

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2013, 35(S1)
Abstract(366) PDF-CN(490)
Abstract:
Application of velocity analysis and variable speed graphics software in southern Hetian
Xu Hao, Yang Zichuan, Hu Jinxiang, Wang Li, Zhu Lin, Du Zhiye
2013, 35(S1): 1-003. doi: 10.11781/sysydz2013S1001
Abstract(708) PDF-CN(595)
Abstract:
Locating in the piedmont tectonic belt of the Kunlun Mountain, the southern Hetian area in the southwestern Tarim Basin is a piedmont tectonic belt with multiple stages and types. Complicated geological structure background makes it difficult for speed research in the study area. The velocity analysis and variable speed graphics software of Hongliu company deals with velocity field problem in complicated area with big stratigraphic dip angle. It solves the problem of deep prediction in the main purpose layer, and ensures the accuracy of drilling design.
Interpretation and modeling technology based on 3d floating datum, northern Yaken, Tarim Basin
Fan Weifeng, Li Chunlei, Jiang Jinyong
2013, 35(S1): 4-007. doi: 10.11781/sysydz2013S1004
Abstract(761) PDF-CN(586)
Abstract:
In the northern Yaken of the Tarim Basin, the surface of 3d work area fluctuates obviously, making it difficult for velocity prediction. Improvements have been made with the newly-designed velocity modeling technology based on floating datum. Migrating error is avoided. The regularity of compaction velocity is used to fill the gap for velocity spectrum data in the shallow. The use of average interval velocity to calculate thickness avoids the problem of bigger average velocity. Ticking outliers based on isochronous speed sliced, the dependence on interpretation layer is avoided smoothly. The interpretation depth with the new method has a standard deviation of 123 m from well, which is 2.19% of relative error. The new-derived equation shows that a larger replacement velocity causes floating datum higher than surface. After the floating datum is compensated to the surface (long wavelength static correction,) the standard deviation decreases to 46 m and the relative error is 1.59%. The new technology implements the structure of Ykb1.
Fine division of logging lithologic section in Ordovician Yingshan Formation, Yubei area, Tarim Basin
Qin Weiqiang
2013, 35(S1): 8-011. doi: 10.11781/sysydz2013S1008
Abstract(717) PDF-CN(630)
Abstract:
The Ordovician Yingshan Formation (over 500 m thick) is the focus for petroleum exploration in Yubei area of the Tarim Basin. Fractures are well developed. Regional tectonic uplift and stratigraphic erosion have made it difficult for formation division and reservoir correlation. Natural gamma curve increases in the study area, and is featured by “horizontal evenness and vertical randomness”. Based on natural gamma ray spectrometry logging and geochemical element logging, the increasing feature of natural gamma ray spectrometry curve is analyzed. Combined with the changes of lithology and logging curve, the Ordovician Yingshan Formation is divided into 4 sections from top to bottom. The 4 sections have good comparability horizontally, providing good foundation for further fine analysis and potential target optimization.
Prediction of water breakthrough time for gas well in Luntai condensate gas field, Shaya uplift, Tarim Basin
Wang Ligang, Yang Xiaoteng, Jin Zhaokang, Lü Jing, Zhang Kui
2013, 35(S1): 12-014. doi: 10.11781/sysydz2013S1012
Abstract(934) PDF-CN(472)
Abstract:
 Locating in the eastern Yakela fault of the Shaya uplift of the Tarim Basin, the Luntai gas pool is a condensate gas pool with bottom water. Water breaks through severely since production; hence the accurate prediction of water breakthrough time is critical for guiding development. Based on data from watered well, by means of Sobocinaki-Cornelius method, the relationship between dimensionless coning height and dimensionless coning time is corrected. The error between predicted and actual water breakthrough times in watered well L5 is 9.24%. The water breakthrough time in well L2 is predicted as 12 years, and the rationality of the result is analyzed.
Evaluation of fluid locking damage in ultra-deep condensate gas well
Chen Qingdong, Ding Weiping, Liu Xiongwei, Liu Jianyi
2013, 35(S1): 15-018. doi: 10.11781/sysydz2013S1015
Abstract(899) PDF-CN(572)
Abstract:
In ultra-deep condensate gas wellbores, fluid lockings are common, which may cause serious economic losses. The experiments of fluid locking damage in cores have been carried out, which help to resolve fluid locking damages and are significant for the efficient development of gas condensate reservoirs.
Initial understanding of isolation of interlayer in Bashijiqike Formation of Dalaoba Condensate Gas Field
Lü Ping, Yao Tianwan, He Yunfeng, Ma Haihu, Ren Hong, Zhang Kui
2013, 35(S1): 19-023. doi: 10.11781/sysydz2013S1019
Abstract(696) PDF-CN(540)
Abstract:
 Thin sandstone and mudstone interlayers with low permeability were identified and classified in the Bashijiqike Formation of the Dalaoba Condensate Gas Field based on well logging data. Standards for well logging identification were established to describe the spatial distribution features of interlayers. Gas pools in the Bashijiqike Formation were controlled by sedimentary environment. In the southwest, mudstone interlayers of type Ⅰ2 developed, characterized by small thickness and poor continuity. In the east, physical interlayers of type Ⅱ2 developed, characterized by big thickness and stable distribution. According to MDT logging pressure data, production well water breakthrough time and gas/ water inversion relationship, the sealing capacity of interlayers in the Bashijiqike Formation was judged. Both of the two types of interlayers were proved capable for sealing. The gas pools were condensate ones with boundary water rather than bottom water.
Prediction and precaution of cyclic gas injection problem in Dalaoba Gas Condensate Reservoir
Lü Ping, Huang Huang, Liu Chunyun, Yao Tianwan, Xiao Hong
2013, 35(S1): 24-027. doi: 10.11781/sysydz2013S1024
Abstract(1142) PDF-CN(605)
Abstract:
The Dalaoba Gas Condensate Reservoir is a fully-equipped sandstone one. In the procedure of depleted exploitation, formation pressure drops quickly and edge water intrudes into gas well. Strata retrogrades condensation seriously and the gas/ oil ratio increases. The recovery rate of gas reservoir decreases. Gas is injected to maintain pressure so as to improve development efficiency and recovery rate. By surveying and studying the examples of gas breakthrough, conformance efficiency, ability of air intake and many other problems encountered in condensate gas reservoir exploitation home and abroad, combining with the characteristics of the Dalaoba Gas Condensate Reservoir, the problem may be faced in cyclic gas injection is summarized, and several proposals are raised to improve the efficiency of gas injection.
Countermeasures for water injection failure in fractured-vuggy reservoirs
Ding Lei, Liu Xiumei, Xiong Yanmei, Wu Wenjing
2013, 35(S1): 28-032. doi: 10.11781/sysydz2013S1028
Abstract(766) PDF-CN(530)
Abstract:
With the continuous expansion of the scale of water injection and the increase of oil wells exploited with water injection, more and more problems appear during injecting progress, and injection failure problems have become increasingly outstanding. A geological conceptual model is preliminarily established, with the static data of oil wells, combining with the acid fracturing pressure curves, water injection indicating curves, production characteristics and dynamic monitoring data (pressure drop testing curves). On this base, the node factors that causing injection effect variation or failure are found, and different tactics are adopted to solve that problem. Through continuous exploration and summary, one series of countermeasures for water injection failure wells has been gradually formed.
Gels to plug water in horizontal wells in clastic rock reservoir in district 9 of Tahe Oil Field
Qiao Quanxi, Chen Youmeng, Liu Pingan
2013, 35(S1): 33-036. doi: 10.11781/sysydz2013S1033
Abstract(731) PDF-CN(560)
Abstract:
 Horizontal wells, as one of the most efficient ways, are applied to develop the Triassic bottom water sandstone reservoir in district 9 of the Tahe Oilfield. Because of sufficient bottom water energy and serious heterogeneity, water coning can be formed along hypertonic paragraph, resulting in quick increasing of water content. Gels with strong plugging capacity and strong oil-water selectivity are used to block water channels. Water is blocked much more than oil even though gels enter into oil-water passage due to strong oil-water selectivity. This technology applies well in practice testing.
Water breakthrough characteristics and controlling measures of condensate gas well
He Yunfeng, Yao Tianwan, Zhang Ai, Wang Ligang, Jin Zhaokang
2013, 35(S1): 37-040. doi: 10.11781/sysydz2013S1037
Abstract(963) PDF-CN(543)
Abstract:
 In the development process of condensate gas reservoir, with the decline of formation pressure and the invasion of formation water, gas wells present different characteristics. Combining data of Cl- and moisture ratio, water type can be divided into three categories: condensate water, bound water and formation water. Through the analysis of moisture ratio, water-gas ratio, Cl- and gas productivity index per meter of condensate water, bound water and formation water, the influences of different water types on gas reservoir development are studied. Combined with the geological characteristics of gas reservoir, the water controlling measures for different types of gas well are put forward.
Discrete numerical well test and water injection optimization of fracture-cave type reservoirs
Long Wu, Zhang Yi, Huang Zhijuan, Wan Xiaoyong
2013, 35(S1): 41-044. doi: 10.11781/sysydz2013S1041
Abstract(922) PDF-CN(646)
Abstract:
 The carbonate oil reservoirs in the Tahe Oilfield belong to ancient karst fracture-cave type reservoirs. It has strongly heterogeneous characteristics and its space distribution is not continuous. The cracks which connect caves are the primary seepage channel and the fluid is mainly stored in the caves, so complex fluid flows lie in the reservoir. The traditional well test methods are hard to correctly describe fracture-cave type reservoir characteristics and fluid flow law. In view of the geologic features of fracture-cave type reservoirs, we regard reservoir as discrete media and set up a discrete numerical well test interpretation method. The results show that interpretations are more in line with the true fracture-cave reservoir geological features, and can better describe fracture-cave reservoir structure. According to the discrete numerical well test analysis combined with geological features, the paper divides carbonate oil reservoirs in the Tahe Oilfield into five typical reservoir types and explains cave sizes, distances and other key reservoir parameters. Well test interpretation results can effectively guide the injection wells optimization, injection parameter optimization and other supporting measures for production. It has an important significance for EOR of fracture-cave type reservoirs.
Distribution regularity of thin sand body in Halahatang Formation of Upper Triassic in Tahe Oil Field
Li Wenping, Fang Qin, Jiang Yumei
2013, 35(S1): 45-048. doi: 10.11781/sysydz2013S1045
Abstract(693) PDF-CN(512)
Abstract:
The fine description of thin layer, sedimentary subfacies and microfacies analyses and reservoir prediction have been made in thin sand body in the Halahatang Formation of the Upper Triassic in the Tahe Oil Field. The range and rule of sand body distribution have been concluded. Based on previous actual drilling data, the fine interpretation of structure has been made combined with seismic analysis. Through core sample observation, analysis and well logging evaluation, combined with dynamic and static data from producing well, the traps in target layers have been evaluated. Favorable traps have been pointed out and reserves have been calculated. Some old wells have been reviewed. The petroleum-bearing capacity of sand body has been judged, providing basement for the further exploration of old wells.
Study and application of waterflooding indication curve in fractured-vuggy heavy oil reservoir
Xiong Yanmei, Mei Shengwen, Liu Hongguang, He Wang
2013, 35(S1): 49-051. doi: 10.11781/sysydz2013S1049
Abstract(774) PDF-CN(519)
Abstract:
The technology of waterflooding to substitute oil in single well is the most economic method to reduce production decline in the exploration of fractured-vuggy carbonate reservoirs in the Tahe Oilfield. We deduce a waterflooding indication curve which is suitable for carbonate reservoir based on the definition of oil compressibility. We analyze the curve, and give some useful suggestions on the estimation of available geological reserves in single well, the time of waterflooding, the suitable work system and the method used to develop well potentiality. Our technology has been used for two years in oilfield, and it provides an effective foundation in the course quantitative analysis which is used to improve oilfield development effect.
Prediction and modeling of fractured-vuggy reservoir in block no. 12 of Tahe Oilfield
Hai Tao, Qian Zhen, Guo Zhongliang
2013, 35(S1): 52-055. doi: 10.11781/sysydz2013S1052
Abstract(866) PDF-CN(549)
Abstract:
In block no. 12 of the Tahe Oilfield, the fractured-vuggy reservoirs in Ordovician are featured by deep depth, irregular caves and fractures development and strong heterogeneity, making reservoir prediction difficult. Based on seismic data, the analyses of the variance ratio of seismic amplitude, eigenvalue coherence and trend surface difference are carried out to show the distribution of fractured-vuggy reservoir. Moreover, the inversion technique of seismic well logging is applied to predict the fractured-vuggy reservoirs in block no. 12 of the Tahe Oilfield. The results show that fractured-vuggy reservoirs are widespread in the study area, but worse in the north than the south. Beaded high-amplitude seismic reflections are well-developed, proved by drilling. Based on impedance inversion and fine-coherence analysis models, an idea of modeling fractured-vuggy reservoir by clustering procedure is proposed.
Features and sources of abnormal water production in Yakela-Dalaoba condensate gas reservoir
Zhang Ai, He Lei, Xu Shisheng
2013, 35(S1): 56-059. doi: 10.11781/sysydz2013S1056
Abstract(815) PDF-CN(620)
Abstract:
During the development of the Yakela-Dalaoba condensate gas reservoir, an abnormal water production type between bottom water and condensate water appears before bottom water invading into reservoir. It is characterized by high water content, high water/ gas ratio (water content is 9 times of initial condensate water content which is 0.084×10-4 m3/m3) and low tested chlorine ion content. Based on dynamic production and experimental data, it is summarized in this paper the water production characteristics and abnormalities of gas wells of the Yakela-Dalaoba condensate gas reservoir. Condensate water and intergranular water (including bound water) are the main sources, and the intergranular water (including bound water) may be carried to wellbore in the form of small droplets by high-speed flow of natural gas or condensate oil. The correct understanding of water production law helps reasonable control.
Main influencing factors and countermeasures of waterflood failure in carbonate rocks
He Wang, Qiu Zhenjun, Hai Tao, Zhang Shiliang
2013, 35(S1): 60-064. doi: 10.11781/sysydz2013S1060
Abstract(701) PDF-CN(565)
Abstract:
The effect of waterflood development in the Tahe Oilfield is obvious, preventing annual natural decline by 10%-15% in the recent 3 years. Statistics have indicated that 16. 1% of total wells fail in waterflood, featured by less injection times and high water cut production. The main influencing factors of waterflood failure include low hole location, poor reservoir condition, unreasonable waterflood parameter design or their composition. Countermeasures are put forward. The principles of well selection and waterflood parameter design are modified. Field application has achieved good effect, proving significance for promotion.
Water production laws and controlling measurements in Yakela-Dalaoba condensate gas reservoir
Xu Shisheng, Gao Jie, Zhang Ai
2013, 35(S1): 65-068. doi: 10.11781/sysydz2013S1065
Abstract(812) PDF-CN(546)
Abstract:
Taking the Yakela-Dalaoba edge-water condensate gas reservoir and the Luntai bottom-water condensate gas reservoir as examples, the water production laws in the exploration of condensate gas reservoir with edge and bottom water are analyzed. Three water production types of condensate gas reservoir are concluded and thecor responding measurements to control water production are proposed. Four edge-water or bottom-water breakthrough models of gas condensate wells and the corresponding controlling measures are put forward. They are applied in the Yakela-Dalaoba edge-water condensate gas reservoir gradually and have gained good effects. The studies of water production laws and controlling measurements in the Yakela-Dalaoba condensate gas reservoir provide significant development guidance for condensate gas reservoirs.
Application of water injection curve in reconstruction of vuggy reservoirs in Tahe area
Guo Zhongliang, He Wang, Hai Tao
2013, 35(S1): 69-071. doi: 10.11781/sysydz2013S1069
Abstract(670) PDF-CN(566)
Abstract:
Due to the strong heterogeneity of vuggy reservoirs in the Tahe Oilfield, it is difficult to judge reservoir structure by coring and logging. Meanwhile, the application of conventional well testing interpretation software is restricted because of poor adaptability. Based on the characteristics of karst landform, a well geological conceptual model is set up according to water injection curve combining with static and dynamic data. Reservoir reforming measurements are taken to improve the efficiency and effect of oil production.
Causes for water flooding failures in carbonate fractured-vuggy reservoirs
Jin Peng, Chen Shanqin
2013, 35(S1): 72-077. doi: 10.11781/sysydz2013S1072
Abstract(751) PDF-CN(515)
Abstract:
 According to the basic principles of replacing oil by water flooding, we have summarized 3 factors which affect flooding effect based on geological models, including the turnover rate of oil and water near to wellbore, the oil and gas enrichment level of immediate vicinity of wellbore and the oil and gas replenishment rate of distant place of wellbore. The wells failed in water flooding have been classified and the corresponding countermeasures have been put forward.
Application of modified vertical tube of crane tube for train loading in Tahe Oilfield
Guo Dongdong, Deng Xia, Liu Changjun, Fu Xuefeng
2013, 35(S1): 78-080. doi: 10.11781/sysydz2013S1078
Abstract(669) PDF-CN(588)
Abstract:
 During the development of new blocks in the Tahe Oilfield, the transportation of crude oil has become more and more important, which requires the efficient running of crane tube for train loading. There are some problems in the train loading for crude oil in Yakelamo station of Oil and Gas Transportation and Sales Department of SINOPEC Northwest Oilfield Company. For example, the connecting plate in inner telescopic tube is broken, wire is fixed in an unreasonable way, and hanging wall falls off. Modifications have been made to reduce the repair rate of crane tube, improve train loading efficiency and protect crude oil transportation.
Processing of super-heavy oil coagulation in wellbore
Gou Bin, Wang Dingke, Wei Hongyang, Li Wei, Yin Yikun, Li Ning
2013, 35(S1): 81-085. doi: 10.11781/sysydz2013S1081
Abstract(732) PDF-CN(504)
Abstract:
In the development of super-heavy oil reservoir, it is very important to prevent coagulation in wellbore. Heavy oil often coagulates and blocks wellbore, and even high pressure fails to go through. In the previous workover treatment, some problems existed, such as the difficult return of heavy oil, the block of circulation system, the abnormal recovery of heavy oil feeding, the dilute oil high consumption, difficult construction, long cycle, high labor intensity and high cost. According to the special well conditions of ultra-deep and super-heavy oil, the buckle with coiled tubing cutting technology, the drilling and grinding technology and the ground device improvement technology have been applied in the Tahe Oilfield, making the prevent of super-heavy oil coagulation more efficient.
Abnormal analysis and countermeasures of molecular sieve dehydrating unit in Dalaoba Gas Collection Station
Luo Hui
2013, 35(S1): 86-088. doi: 10.11781/sysydz2013S1086
Abstract(919) PDF-CN(745)
Abstract:
The effective running of molecular sieve dehydrating unit is very important for natural gas processing. If molecular sieve dehydrating unit becomes invalid too quickly, it will restrict the safe, stale and effective operation of gas processing plant. The reasons for problems in molecular sieve dehydrating unit in the Dalaoba Gas Collection Station are discussed, and a series of practices are carried out. It has been found out that wax brought out by natural gas is harmful for molecular sieve’s efficiency. Some measures to improve the efficiency of molecular sieve dehydrating unit are proposed.
Practice of return acidification in vuggy reservoirs, Tahe Oil Field
Guo Zhongliang
2013, 35(S1): 89-091. doi: 10.11781/sysydz2013S1089
Abstract(751) PDF-CN(529)
Abstract:
In the Tahe Oil Field, vuggy reservoirs with active bottom water and well-developed high-angle fractures are explored by means of overall acidification. There is little potential after flooding. Through the identification and classification of dense segment, the remaining potential of reservoir is evaluated by means of the water drive curve of sandstone reservoir. Taking use of the barrier effect of dense segment, return acidification practice is carried out successfully in the field, and succeeds in increasing oil production.
Application of surface drive screw pump for oil emulsion lifting in Tahe Oilfield
Xu Yueyue, Yin Pan, Tan Hui, Jin Shilei
2013, 35(S1): 92-094. doi: 10.11781/sysydz2013S1092
Abstract(746) PDF-CN(529)
Abstract:
The pumping wells in Tahe Ordovician reservoir flush frequently, since oil emulsion causes polish rod lag and high current. Flushing causes long period of discharging flushing liquid and it always operates shortly. General oil-well pump and centrifugal pump cannot fit oil emulsion. This paper analyzes the failure of screw pump and researches other papers. The surface drive screw pump is improved in sucker rod and rubber. It is applied in well TK241CH and fits oil emulsion.
Discussion on high-temperature bottom water in condensate oil tank
Liu Jianhui, Zhang Renyi
2013, 35(S1): 95-097. doi: 10.11781/sysydz2013S1095
Abstract(685) PDF-CN(606)
Abstract:
 In the Dalaoba gas collection station, temperature rises abnormally in some condensate oil tanks. The reasons are discussed according to field condition and tank structure. The phenomenon of high-temperature bottom water in condensate oil tank is analyzed. Some advices for tank design and management are proposed.
Preliminary study of reasonable pressure difference including stress sensitivity in well block Shun 9
Tao Shan, Xu Y
2013, 35(S1): 98-100. doi: 10.11781/sysydz2013S1098
Abstract(622) PDF-CN(500)
Abstract:
Taking the sandstone reservoirs in well block Shun 9 in the Tahe Oil Field as an example, the reasonable pressure difference including stress sensitivity in reservoirs with low porosity, low permeability and microfracture is calculated with 3 different methods. The method which is most favorable for the study area is chosen after comparison. The critical pressure difference in well block Shun 9 is calculated as 22.10 MPa. The result is applied in the gas lift depth calculation in Shun 9CH, that is, under 888.53 m.
Key technology of gathering and transportation of ultra-thick high-sulfur crude oil in Tahe Oilfield
Zhao Yi, Ye Fan, Qiu Haifeng, Zhong Rongqiang, Kong Xiangmin, Zhang Jing
2013, 35(S1): 101-103. doi: 10.11781/sysydz2013S1101
Abstract(810) PDF-CN(630)
Abstract:
As an Ordovician carbonate karst vuggy extra-heavy unsaturated bottom-water reservoir, the super heavy oils in the Tahe Oilfield are featured by ultra-deep, ultra-thick, high viscosity, high-density, high content of H2S, high salinity and other characteristics. Acid fracturing is in large scale, and development and ground gathering are difficult. The SINOPEC Northwest Oilfield Company, through scientific research, has solved the problems in the gathering and transportation of ultra-thick crude oil. The gathering and transportation technique by mixing light oil to decrease viscosity is innovated. The desulfurization technique by gas extraction is applied for the first time on heavy oil rich in H2S, breaking heavy oil dehydration process to achieve the closed gathering of ultra-heavy oil.
Discussion on treatment process of oily waste water
Dong Gang, Liu Tao, Mao Yingtao, Xu Jing, Yang Xin
2013, 35(S1): 104-107. doi: 10.11781/sysydz2013S1104
Abstract(646) PDF-CN(565)
Abstract:
With the development of the Tahe Oilfield, the property of produced fluid changes, which increases the stability of oil/ water emulsion. Consequently, different components, solid or fluid, evenly disperse in sewage, resulting in unstable dehydration. The treatment of simultaneous oil and impurity removal in settler cannot meet the requirement of present production. Therefore, by adopting the processing technology of " removing oil firstly, impurity secondly", oil emulsion in sewage can be utmost eliminated, easing production loading in the settling and filtering sections. This processing technology has gained a successful application in the No. 2 and No. 3 plants of water disposal of the Tahe Oilfield, offering reference for the treatment of oil-bearing sewage which is highly-emulsified and has low oil/ water density difference.
Knowledge and practice of leakage casing and tube plugging in Tahe ultra-deep and super-heavy oil oilfield
Yan Junbao, Ding lei, Yang Yaohui
2013, 35(S1): 108-110. doi: 10.11781/sysydz2013S1108
Abstract(678) PDF-CN(543)
Abstract:
During the development of the Tahe Oilfield, well casing leaks more and more seriously year by year. Restricted by well depth, heavy oil, high temperature, high salinity, high hydrogen sulfide corrosion, well bundle structure and light oil injection, the conventional methods of leakage casing fail to meet the demand of the Tahe Oilfield which is featured by ultra-deep and super-heavy oil. The practices of leakage casing and tube plugging in 14 wells are analyzed, summarizing the corresponding conditions for 4 methods of leakage casing and tube plugging in ultra-deep and super-heavy oil wells. The advantage and disadvantage of 2 methods are discussed. Applications of leakage casing and tube plugging are made for 11 times in 10 wells, adding up oil by 5.86×104 t.
Deep pumping technology for large sucker rod pump in Tahe Oilfield
Chen Can, Shi Shuo, Yang Xiaohui, Xu Xin, Xie Xiangjun
2013, 35(S1): 111-113. doi: 10.11781/sysydz2013S1111
Abstract(731) PDF-CN(609)
Abstract:
The carbonate fractured-vuggy reservoirs with bottom water in Ordovician are most contributive in the Tahe Oilfield, and are characterized by extremely high heterogeneity. The current depth of plunger in the Tahe Oilfield has reached 2 606 m, and is deepening gradually. The working fluid level of 120 wells is below 2 500 m, accounting for 15.4% of total wells. In wells with insufficient liquid supply, water injection and deep pumping are the only ways to maintain normal production. When water injection fails in single well or unit, deep pumping is the main measurement to improve well production and development effect. The next step is to resolve the contradiction between pump setting depth of sucker rod pump and pump output, starting to develop the deep pumping technology of bull pump. The deep pumping technology for large sucker rod pump has been applied successfully in the Tahe Oilfield, and has increased oil production significantly. At present, the technology has been successfully applied for 3 times.
Technical transformation of first station constant pressure water supply system in Tahe Oil Field
Wang Hongshi, Zhang Bin, Luo Zeng
2013, 35(S1): 114-116. doi: 10.11781/sysydz2013S1114
Abstract(677) PDF-CN(527)
Abstract:
In view of the increasing demand for fresh water and the present condition of first station water supply system in the Tahe Oil Field, technical innovation has been made, including the transformation of power supply and control circuits. After the transformation, 2 sets of frequency converter can drive 2 pumps respectively, enhancing the water supply capacity of first station and meeting the production and living water demands in the Tahe Oil Field.
Influencing factors and controlling measures for the effect of doped dilute mixtures of heavy oil pump
Du Linhui, Chen Huaqiang, Liu Rui, Xia Xinyue, Zhao Yuan
2013, 35(S1): 117-120. doi: 10.11781/sysydz2013S1117
Abstract(661) PDF-CN(551)
Abstract:
Tahe heavy oil submersible electric pump in present pipe column structure leads to poor blend effect and causes many problems such as short downtime, low well electric pump operation frequency, short service life, high injection-production ratio, low oil utilization rate, high production cost and low economic benefit. Four elements controlling the effect of doped dilute mixtures of heavy oil pump are found, including mixing time, mixing temperature, contact surface and mixing strength. The corresponding countermeasures are put forward and applied in field works. The utilizing rate of dilute oil is improved significantly. The average ratio of injection to production declines by 0.22-0.49. Good economic efficiency shows great potential for future application.
Evaluation of new fracturing fluid system
Hou Fan, Zhang Ye, Yang Fangzheng, Zhang Zelan, Fang Yuyan, Jiao Kebo
2013, 35(S1): 121-124. doi: 10.11781/sysydz2013S1121
Abstract(671) PDF-CN(632)
Abstract:
The studies of new fracturing fluid are carried out in order to take the place of guar gum due to increasing cost. Based on the comprehensive evaluation of fracturing fluid system of modified xanthan gum and high polymer, the laboratory recipes of fracturing fluid of modified xanthan gum slippery water and high polymer are proposed. The fracturing fluid of modified xanthan gum has some shortcomings such as poor resistance for high temperature and long-time shearing and high content of glue residue. The fracturing fluid of high polymer is in high content of thickener, and it is difficult to balance delayed cross-linking performance and high temperature performance. The new fracturing fluid system can be applied in field works after further improvement.
Study of new gel agent to plug horizontal well in clastic rock reservoir in Tahe Oilfield
He Xing, Yang Liping, Ma Shufen
2013, 35(S1): 125-128. doi: 10.11781/sysydz2013S1125
Abstract(649) PDF-CN(567)
Abstract:
The conventional gel plugging agents have some shortcomings such as low intensity, poor heat/ salt resistance and high cost. In view of high temperature and salinity in the Tahe Oilfield, the combination of organic gel and inorganic network is introduced, and a new gel plugging system with higher resistance for heat/ salt is set up. The new system remains stable for 90 days in formation water at the temperature of 130 ℃ and the salinity of 20×104 mg/ L, showing good capacities of plugging. It has been applied in well TK937H, raising oil product obviously.
Sidetracking technology of new three-stage well structure in Tahe Oilfield
Yu Yang, Zheng Jiangli, Liu Xiaomin, Li Guangqiao, Zhou Wei
2013, 35(S1): 129-132. doi: 10.11781/sysydz2013S1129
Abstract(937) PDF-CN(631)
Abstract:
 67 wells have been drilled since a new three-stage well structure was tested and promoted in the Tahe Oilfield in August of 2011. Considering the sidetracking needs of these wells, a sidetracking technology program is presented in this paper. First, mudstone is drilled with 165. 1 mm bit and cemented with 139. 7 mm casing. Second, to reach design depth with 118 mm bit. Meanwhile, the feasibility of 139. 7 mm casing cementing and the directed drilling technique support of sidetracking slim hole are discussed. The optimized sidetracking technique program is proved feasible, and can meet the sidetracking requirements of new three-stage well structure in the Tahe Oilfield.
Feasibility assessment of safe application of turbine drill in block Mai 1
Pan Lijuan, Liu Biao
2013, 35(S1): 133-136. doi: 10.11781/sysydz2013S1133
Abstract(521) PDF-CN(508)
Abstract:
The technique of turbine drill has been planned to apply in block Mai 1 in order to improve production efficiency; however, due to the low ROP in igneous rocks in the Kaipaizileik Formation, collapse may happen in some wells and cause drilling stuck. So it is necessary to carry out a feasibility assessment. Through the analysis of igneous rock size, falling collapse time and log data, the debris falling collapse cycle, size and quantity proportion have been realized and the falling well section has been defined. According to the request of well bore structure of block Mai 1, from the viewpoints of optimizing assembly and carrying rock, we analyze how to use 139. 7 mm drill pipe under the condition of pump pressure to allow and reduce circulating pressure loss, improve annular return velocity, determine debris falling security to carry out the limit of well depth and pump rate, and finally reduce the risk of drilling stuck. The purpose of using turbine drill in igneous rock formation drilling safely and quickly has been achieved.
Technology and practice of fishing seriously-corroded tubings in Tahe Oilfield
Zhang Zhongbao
2013, 35(S1): 140-143. doi: 10.11781/sysydz2013S1140
Abstract(918) PDF-CN(524)
Abstract:
Due to ultra depth of wells, formation fluid corroding,HTHP, electrochemical corroding, workover damage, etc. , the corrosion and fracture of tubings in the Tahe Oilfield are increasing year by year, which bring a lot of troubles in the fishing process. Based on special fishing measures, proper choice of tools and reasonable technological parameters according to downhole conditions, the corroded tubings in well T801(K) have been fished successfully. This provides good experience to fish severely-corroded tubing.
Upgrading of integrated transportation management system for “three kinds of liquid” of oilfield
Zhao Lihu, Song Daojie
2013, 35(S1): 144-146. doi: 10.11781/sysydz2013S1144
Abstract(647) PDF-CN(522)
Abstract:
Through the upgrading of integrated transportation management system for “three kinds of liquid” of the Tahe Oilfield, reform covers the related service scheduling, allocation, weighing, statistics and system administrators of all personnel, forming a set of information integrated system of business process information, vehicle real-time monitoring, video monitoring, vehicle parking induction, automatic weighing, workload statistics, visa, settlement and etc. The upgrading and applying in production ensure personnel and equipment safety, improve production support capability and efficiency, and have obtained good economic efficiency.

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