滩坝砂油藏不同压裂方式下单井控制可采储量预测方法

苏映宏

doi:10.11781/sysydz202104697

滩坝砂油藏不同压裂方式下单井控制可采储量预测方法

doi: 10.11781/sysydz202104697

苏映宏

中国石化石油勘探开发研究院, 北京 102206

基金项目:

中国石化科技部项目“石油探明未开发储量优选评价及潜力研究” P18055-3

详细信息

作者简介:
苏映宏(1971-), 男, 硕士, 高级工程师, 从事储量评价研究。E-mail: suyh.syky@sinopec.com

中图分类号: TE155
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出版历程
- 收稿日期: 2021-02-10
- 修回日期: 2021-05-06
- 刊出日期: 2021-07-28

Prediction of single-well-constrained recoverable reserves in beach bar sand reservoir using different fracturing methods

SU Yinghong

SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

摘要

摘要: 单井控制可采储量是评价滩坝砂油藏开发是否经济可行的重要指标。由于未动用特低渗透滩坝砂油藏存在压敏效应、启动压力梯度、不同压裂方式等特征，难以应用常规的单井控制可采储量预测方法进行预测。基于典型区块静、动态数据，建立直井分层压裂油藏数值模拟模型，通过历史拟合确定启动压力梯度及压敏效应表征公式中的系数，并分析压敏效应和启动压力梯度对生产动态的影响。在此基础上，分析不同油藏参数和开发参数对直井分层压裂弹性开发单井控制可采储量的影响，确定单井控制可采储量的主控因素依次为：压力系数、渗透率、含油饱和度、有效厚度、孔隙度、压裂缝长、集中度和黏度；通过多元回归方式建立直井分层压裂弹性开发下单井控制可采储量与主控因素之间的计算公式，经与实际生产井数据对比，相对误差为4.58%，说明公式具有较高的精度，能够满足矿场要求。进一步建立直井体积压裂、水平井多段压裂和水平井体积压裂弹性开发单井控制可采储量与油藏参数之间的预测公式，研究结果为评价滩坝砂油藏动用潜力提供基础。
- 滩坝砂油藏 /
- 单井控制可采储量 /
- 主控因素 /
- 压裂方式 /
- 储量预测
Abstract: Single-well-constrained recoverable reserve is an important index to evaluate whether the development of beach bar sand reservoir is economically feasible. Due to the characteristics of pressure sensitive effect, start-up pressure gradient and different fracturing methods, it is difficult to apply the conventional prediction method to single-well-constrained recoverable reserve in undeveloped ultra-low permeability beach bar sand reservoirs. In this paper, based on the static and dynamic data of typical blocks, a numerical simulation model of vertical well stratified fracturing was established. The coefficients in the characterization formula of start-up pressure gradient and pressure-sensitive effect were determined by history fitting, and the influences of pressure-sensitive effect and start-up pressure gradient on production performance were analyzed. On this basis, the influence of different reservoir parameters and development parameters on the single-well-constrained recoverable reserves of elastic development with vertical-well stratified fracturing was analyzed. The main factors of single-well-constrained recoverable reserves were determined as follows: pressure coefficient, permeability, oil saturation, effective thickness, porosity, fracture length, concentration and viscosity. A vertical-well stratified fracturing model was established by multiple regression. Compared with the data from actual production wells, the relative error was 4.58%, which showed that the formula had a high accuracy and could meet the requirements of mines. Furthermore, some prediction formulas between the single-well-constrained recoverable reserves and the reservoir parameters corresponding to the volume fracturing of vertical wells, the multi-stage fracturing of horizontal wells and the volume fracturing of horizontal wells were established. The results provided a basis for evaluating the production potential of beach bar sand reservoirs.
- beach bar sand reservoir /
- single-well-constrained recoverable reserves /
- main controlling factors /
- fracturing mode /
- reserves forecast

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图 1 模型纵向示意图

Figure 1. Longitudinal schematic diagram of single well model

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图 2 月产油量对比

Figure 2. Comparison of monthly oil productions

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图 3 井底流压对比

Figure 3. Comparison of bottom hole pressures

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图 4 储层含油饱和度场比较

Figure 4. Comparison of reservoir oil saturation fields

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图 5 储层压力变化场比较

Figure 5. Comparison of reservoir pressure change fields

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图 6 油田现场数据与模型计算累积产油量对比

Figure 6. Comparison of field data and model calculated cumulative oil productions

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图 7 各参数变化幅度对应的单井控制可采储量变化曲线

Figure 7. Variation curves of single-well-constrained recoverable reserves corresponding to the variation range of each parameter

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图 8 多元回归拟合效果

Figure 8. Fitting effect of multiple regressions

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图 9 FXX7-X6井月产油量

Figure 9. Monthly oil productions of well FXX7-X6

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图 10 FXX4-X9井月产油量

Figure 10. Monthly oil productions of well FXX4-X9

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图 11 不同井型及压裂规模单井控制可采储量对比

Figure 11. Comparison of single-well-constrained recoverable reserves of different well types and fracturing scales

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表 1 单井控制可采储量随各油藏参数因素变化状况

Table 1. Variation of single-well-constrained recoverable reserves with various reservoir parameters

变化幅度/%	单井控制可采储量评估结果/10⁴ t
变化幅度/%	渗透率	有效厚度	黏度	含油饱和度	孔隙度	压力系数	压缩系数	集中度	压裂缝长
-30	0.325	0.488	0.708	0.177	0.489	0.009	0.681	0.588	0.559
-25	0.399	0.522	0.705	0.289	0.523	0.123	0.683	0.605	0.583
-20	0.448	0.556	0.703	0.391	0.557	0.237	0.685	0.623	0.606
-15	0.501	0.591	0.701	0.483	0.591	0.351	0.687	0.640	0.629
-10	0.556	0.625	0.698	0.564	0.625	0.464	0.689	0.658	0.650
-5	0.615	0.659	0.696	0.634	0.66	0.578	0.691	0.675	0.671
0	0.693	0.693	0.693	0.693	0.693	0.693	0.693	0.693	0.693
5	0.740	0.728	0.691	0.745	0.728	0.806	0.696	0.711	0.711
10	0.806	0.762	0.689	0.785	0.762	0.920	0.698	0.729	0.730
15	0.876	0.796	0.686	0.815	0.796	1.034	0.700	0.748	0.748
20	0.949	0.83	0.684	0.834	0.83	1.148	0.702	0.766	0.765
25	1.024	0.865	0.682	0.843	0.864	1.262	0.704	0.784	0.782
30	1.102	0.899	0.679	0.844	0.898	1.375	0.706	0.803	0.798
变化30%与-30%的差额	0.777	0.411	0.029	0.667	0.409	1.366	0.025	0.215	0.239

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表 2 单井控制可采储量对比

Table 2. Comparison of single-well-constrained recoverable reserves

井号	渗透率/10^-3 μm²	有效厚度/m	含油饱和度	孔隙度	集中度	目前累计产油量/10⁴ t	单井控制可采储量/10⁴ t		相对误差/%
井号	渗透率/10^-3 μm²	有效厚度/m	含油饱和度	孔隙度	集中度	目前累计产油量/10⁴ t	预测值	多元回归计算值	相对误差/%
FXX4-X9	5.87	12.1	0.380	0.143	0.10	0.85	0.91	0.90	1.099
FXX1-X8	14.40	8.5	0.523	0.142	0.36	1.34	1.36	1.28	5.882
FXX7-X6	9.11	11.4	0.476	0.141	0.38	1.01	1.02	1.05	2.941
FXX7-X2	5.43	25.8	0.370	0.118	0.20	0.62	0.66	0.61	7.576
FXX4-X6	4.85	11.4	0.392	0.144	0.30	0.34	0.37	0.39	5.405

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