海上低渗透油田特点及开发策略探讨

目前海油低渗探明储量和低渗的产量分别占海油总探明储量和总产量比例虽然小,但在海油实现5 000万t年产后稳产阶段所起的作用将会越来越大。对于海上10～50 mD之间的一般低渗为主要考虑的勘探开发对象,当渗透率是5～10 mD之间的特低渗油田时需要优选出构造相对简单、储层比较连续的区块开发;对于复杂断块特低渗透油田和小于5 mD的超低渗油田,在目前海上经济技术条件下暂不具备勘探开发条件。在海上低渗透油田开发中需考虑压裂、注水的综合应用,尽量采用水平井和分支井开发,并且在开采过程中注意低渗储层的保护。

Study on Characteristics of Offshore Low-permeability Field and Development Strategy

The proved reserve and production of low-permeability reserves in CNOOC account for a small part in CNOOC＇s total preserved reserve and production at present.But it is becoming more and more important to keep the stable production of 500,000,000 ton each year.The main exploited low-permeability reserves in offshore are the reserves with permeability from 10mL to 50 mL.If the permeability is between 5 mL to 10 mL,it is necessary to choose the continuous reserves with relative simple structures to exploit.It is not recommended to exploit the complex blocks with lower permeability less than 5 mL according to present economic and technique.The integrated application of fracturing and water injection is vital to the development of the low-permeability reserves,the horizontal well and side track well were recommended for the exploitation,and special protection measures should be taken during development.