文东复杂断块油田开发的几点认识

Some Knowleges of Wendong Complicate Fault-Block Oil Field

李战良,张中伟,史小平　　　

Li Zhanliang, Zhang Zhongwei, Shi Xiaoping

中原石油勘探局采油一厂,中原石油勘探局勘探开发科学研究院

Zhongyuan Petroleum Exploration Bureau , Henan , 457001 , P. R. China

文东油田属于异常高温、高压、低渗透复杂断块油田。由于其油层埋藏深、储层物性差、层间差异大、油气比高及含盐量大的特点,给该油田的开发提出了严峻的课题。在没有同类油田可借鉴的情况下,经过11a 的开发实践,摸索出了一套适合文东复杂断块油田开发的成功经验。通过对油田实施高压注水,地层压力回升,油田递减减缓,但要恢复到原始地层压力却很困难;压裂改造在油井投产初期和注水见效之后,通过优化选井和压裂方式,可以取得较好的增油效果;气举采油有效克服了高油气比和结盐、结蜡及井深、井况差的影响,提液效果好;逐层上返实验提高了采油速度和水驱动用程度,改善开发效果,为解决层间干扰、平面效率低等问题提供了经验借鉴。

Wendong oil field belongs to a complicate fault block oil fields with abnormal high temperature, high pressure , low permeability. Because the field has characters that reserviors are buried deeply , and it’s physical properties are poor ,interlayer differences are significant . Oil-gas ratio is high and has a high aquifer and salt content ,A Serious problems are put forward for us to develop it . Through 8 years development ,we get successful experience for complicate fault-block oil field development ,there are four respect s. ①lnjected water with high pressure have been adopted to make pressure build up and output depletion has slown down ,but it is difficult to recovery in-situ formation pressure. ②Fracturing improving has won an effect in the earlier time of putting into production and after the injection water by optimizing selecting wells and fracturing technique. ③Gas-lift has overcome high oil-gas ratio and salt deposit ,wax deposition and also the influnce of well depth and poor well conditions. Pumping liquid has good effect. ④Developing upward in turn intervel may increase recovery and the degree of water flooding , improving developing effect and provide the reference experience to solve the problems of interlayer interference and low plane efficency.