Lifting the depth of rod pump with deepening tail pipe and its influencing factors
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摘要: 塔河油田油藏属于缝洞型碳酸盐岩油藏，埋藏深度大（5 350~6 600 m），流体性质复杂，目前最高黏度245 000 mPa·s（55℃），即原油在深度3 000 m以下的井筒内不具有流动性，为此，采用套管掺入稀油的降黏方式进行开采。随着油田超稠油区块储量动用，机械举升难度增大。通过对塔河油田稠油区块不同泵型有杆泵井实施浅提泵挂加深尾管，以及对稠油有杆泵浅提泵挂影响因素分析，在保障稀稠油混配质量的前提下，达到合理上提泵挂深度，降低杆柱载荷的目的，从而改善有杆泵运行工况。Abstract: The Tahe reservoir is a fractured-vuggy carbonate reservoir about 5 350-6 600 m deep with complicated fluid properties. The highest viscosity is 245 000 mPa·s (55℃), that is, crude oil in wellbore over 3 000 m deep could not flow. Therefore, we mixed light oil into pipes to reduce viscosity. As more heavy oil reserves have been employed, the difficulty of mechanical lifting increased. We lifted the depth of rod pump and deepened tail pipe in view of different sucker-rod pump types in heavy oil blocks in the Tahe oil field, and discussed their influencing factors. By guarantee the quality of mixed oil, we reasonably lifted pump depth in order to reduce rod load, and to improve rod pump working condition.
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