摘要
随着海上油气田的进一步开发,海上已经针对低渗透油气田进行了开采,目前海上LF等多个低渗透油气田已经进行开发,这些区块储层砂岩岩石强度属于中-高强度,其生产过程中的井壁稳定问题直接影响着完井方式及后期的开发方式。针对海上LF中高强度砂岩油田水平井生产过程中的井壁问题展开研究,通过数值模拟的方法,利用等效塑性应变理论,对水平井在生产过程中影响井壁稳定的因素(生产压差、地层出水、地层压力衰减)进行研究。研究结果也表明,水平井井眼沿最小主应力方向时,且在纯砂岩地层中时可以采用裸眼完井,与油田实际生产的情况相符,从而验证了该方法的可行性。研究结果可对油田进行完井方法优选以及后期作业提供指导。
With the further development of offshore oil and gas fields,the low permeability oil and gas fields have been developed.And the rock strength of these sandstone reservoirs belonged to medium-high level,the wellbore stability at the production stage directly affected the methods of well completion and development.In allusion to the problem of wellbore stability in the process of horizontal well production in the sandstone reservoirs of Offshore LF Oilfield and by using the method of numerical simulation and the theory of equivalent plastic strain,the factors(production pressure,formation water,formation pressure attenuation)influencing the borehole stability in the production process of horizontal wells were studied.The results show that when the horizontal wells are in pure sandstone and along the direction of minimum principal stress,open hole completion can be taken.And this is consistent with the actual production situation in the oilfield,which verifies the feasibility of this method.The results of the study can provide guidance for the optimization of well completion methods and the late operation of the oilfield.
出处
《长江大学学报（自然科学版）》
CAS
2017年第7期56-61,共6页
Journal of Yangtze University(Natural Science Edition)
基金
国家科技重大专项(2011ZX05024-003)
关键词
水平井
生产过程
井壁稳定
中高强度砂岩
horizontal well
production stage
borehole stability
sandstone with medium-high strength
