特殊工艺井开采特殊油气藏技术进展

Study on Non-conventional Well Technology for Special Reservoir Exploitation

目前我国的一些老油区,低渗透、稠油、断块等特殊油气藏已逐渐成为主力接替区块,依靠常规直井、水平井技术难以对其经济有效开发。以分支水平井为代表的特殊工艺井技术可实现一个井口对应多个地下井眼、多个储层同时开发的目的,显著增加储层裸露面积,提高油气采收率和储层的动用程度。文章在简要列举了特殊油气藏开发的难点之后,对特殊工艺井的安全钻井技术、井眼轨迹控制技术、特殊工艺井完井技术、储层保护技术等配套技术的研究情况进行了详细介绍,并明确表示他们依靠特殊工艺井钻完井配套工艺,完成了各类分支井近80口,其中鱼骨分支井60余口,钻完井成功率为100%,固井优质率达90%以上,实现了特殊油气藏的经济高效开发,为同类特殊油气藏开发提供了宝贵的经验。

Now low-permeability reservoirs,heavy oil reservoirs,fault-block reservoirs,and other special reservoirs have become main replacement blocks of some old oil provinces in china,they are difficult to be developed economically by using conventional vertical well technology and horizontal well technology.Non-conventional well technology represented by branch horizontal well technology could achieve the goal of developing multiple reservoirs at the same time by corresponding one wellhead with a number of underground boreholes,increasing the exposed area of reservoir significantly and enhancing oil-gas recovery and sweepout of reservoir.After briefly introducing the difficulties in special oil and gas reservoir exploitation,this paper introduces the systematic non-conventional well drilling technology,well trajectory control technology,special well completion technology and reservoir protection technology in details,and points out that they have been used to nearly 80 branch wells including more than 60 fishbone-branch wells,with the success rate of drilling and completion reaching 100% and the high-grade cementing rate higher than 90%,fulfilling economic and efficient development of special reservoir and providing valuable experience for development of similar special reservoir.