异常高压变形介质油藏的开发动态特征研究--以尕斯库勒油田E3油藏为例

目的 通过研究异常高压变形介质油藏的开发动态特征，探讨该类油藏的开发模式。方法以尕斯库勒油田E3异常高压变形介质油藏为例，应用变形介质渗流理论，结合渗透率地层条件下模拟试验及典型井组生产动态数据分析，研究异常高压下变形介质油藏开发特征及合理开发模式。结果异常高压变形介质油藏表现出不同于常规油藏的开发动态特征，在开发过程中随着地层压力的下降，介质弹塑性形变，渗透率大幅度下降，不同结构的岩石发生不同程度的弹塑性形变；当关井恢复压力时油藏渗透率有所恢复，但随地层压力的进一步下降，介质发生不可逆形变，渗透率将逐渐下降，从而使油井产能降低；变形介质油藏具有特殊的弹塑性驱动渗流指示曲线特征，油井产量随压差增加到一定极限后，再增加压差产量随之下降。结论变形介质油藏的开发应尽可能在原始地层压力下开采，在合理生产压差下开发。

A study on the development performance of the deformable medium reservoir:Take E3 reservoir in Gaskule Oilfield as example

Aim To discuss the exploitation model of deformable medium reservoir in abnormally high-pressure by the study of the development performance. Methods Studing the exploitation performance character and reasonable exploitation model of the deformable medium reservoir in abnormally high-pressure exemplified to E3 reservoir in Gaskule Oilfield and applying to the seepage theory of the deformable medium formation and combining to the permeability simulate experimentation in stratum condition. Results The deformable medium reservoir in abnormally high-pressure is different from the conventional one in the development performance, In the middle of development, with pressure dropping, the medium of the reservoir appears elastic-plastic deformation with the permeability greatly decreasing, the extent of elastic-plastic deformation varies from the rock structure, so does the extent of irreversible decrease, the permeability of the reservoir will get recovery a bit when shut-in well and pressure builds up. But medium will be deformed irreversibly and permeability increasingly decrease and oil well productivity decrease too when formation pressure drops further, this deformable medium reservoir shows character of elastic-plastic flow indicative curve. The oil well productivity will decrease if production pressure difference increases over a limit. Conclusion The deformable medium reservoir should be developed by a reasonable presser, as possible as keeping original formation pressure.