High-efficient drainage technology of shale gas reservoirs with normal pressure in Pengshui Block

DUAN Chenglian; WEI Fengling; WEI Ruiling; LIU Fang; LIU Jing; WU Xiaoding

doi:10.13809/j.cnki.cn32-1825/te.2020.01.010

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High-efficient drainage technology of shale gas reservoirs with normal pressure in Pengshui Block
Vol. 10, Issue 1, Pages: 64-70(2020)
Published：2020
DOI： 10.13809/j.cnki.cn32-1825/te.2020.01.010
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DOI：

DUAN Chenglian, WEI Fengling, WEI Ruiling, et al. High-efficient drainage technology of shale gas reservoirs with normal pressure in Pengshui Block[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(1): 64-70. DOI： 10.13809/j.cnki.cn32-1825/te.2020.01.010.

摘要

彭水区块属于常压页岩气藏

压裂投产后无法自喷。在正常生产中也有地层水产出

由于地层能量不足、产气量低无法携液生产

因此

排采需求贯穿整个生产阶段。由于排液量变化大

不同开采阶段缺乏对应的合理排采方式

彭水页岩气的排液效率较低。为了确定适合彭水区块的高效排采方式

针对区块的排液特点

从经济和技术角度综合评价、优选了电潜泵+气举复合排采、同心管（小直径管）排采、自产气压缩机气举排采、外输气气举排采方式

形成了一套适合彭水区块常压页岩气的排采技术

气举排液的返排率达到72 %

对提高彭水页岩气的开发效益具有一定的指导意义。

Abstract

The shale gas reservoirs in Pengshui Block belong to the normal pressure system

where the spontaneous production fails after hydraulic fracturing. This is due to the relative low energy and productivity of the reservoirs

hence it is necessary to deploy the artificial lift for the production wells to drainage the water throughout the whole production stage. As the drainage methods are hardly suitable for the various flowback volume in different mining stages

the water drainage efficiency is low. In order to determine the efficient drainage strategies for Pengshui Block

several drainage processes

including electric potential pump+gas lift

concentric tube（small diameter tube） drainage

self-sufficient gas lift and transmission gas lift

are comprehensively evaluated and optimized at the point of economic and technical stage according to the drainage characteristics of the block. The drainage efficiency of gas lift forms a set of drainage technology suitable for shale gas with normal pressure in Pengshui Block. The flowback efficiency of gas lift is up to 72 % in field application. It provides a significant guideline for improving the development of shale gas reservoir in Pengshui.