低渗透气藏水平井气水两相产能研究

袁淋，李晓平

doi:10.11764/j.issn.1672-1926.2014.09.1455

天然气地球科学 >

2014 , Vol. 25 >Issue 9: 1455 - 1461

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.09.1455

天然气开发

低渗透气藏水平井气水两相产能研究

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西南石油大学“油气藏地质及开发工程”国家重点实验室，四川成都 610500

袁淋（1990-），男，四川南充人，硕士研究生，主要从事油气藏工程及渗流力学研究. E-mail：yuanlin343@163.com.

收稿日期: 2013-09-05

修回日期: 2013-11-05

网络出版日期: 2014-09-10

基金资助

国家杰出青年科学基金项目“油气渗流力学”(编号：51125019)资助.
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The Productivity Study of Gas-Water Two Phase Horizontal Well in Low-permeability Gas Reservoir

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（State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China）

Received date: 2013-09-05

Revised date: 2013-11-05

Online published: 2014-09-10

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摘要

低渗透含水气藏开发过程中，水平井底见水不仅增加了地层流体渗流的复杂性，而且降低了水平井产量。以气水两相渗流理论为基础，建立了气水两相运动方程，定义气水两相启动压力梯度以及气水两相广义拟压力，考虑应力敏感、滑脱效应、紊流效应和表皮效应对气水同产水平井产能的影响，利用保角变换方法推导出低渗透气藏中水平井气水两相三项式产能新公式。通过实例计算，利用新公式计算的无阻流量结果与实际产能测试结果相对误差较小，仅为5.13%，说明新公式精确可靠，且敏感性分析表明，水平气井产水量随着滑脱因子以及水气质量比的增大而增大，而随着启动压力梯度以及应力敏感指数的增大而减小，但启动压力梯度对产水量影响较小，若生产压差较大，启动压力梯度可以忽略不计。

关键词：

低渗透; 水平井; 气水两相; 产水量; 启动压力梯度; 应力敏感; 滑脱; 水气质量比

本文引用格式

袁淋，李晓平 . 低渗透气藏水平井气水两相产能研究[J]. 天然气地球科学, 2014 , 25(9) : 1455 -1461 . DOI: 10.11764/j.issn.1672-1926.2014.09.1455

Abstract

During the development of low-permeability water-cut gas reservoirs with horizontal well,water breakthrough not only adds the complexity of fluid percolation,but also decreases the production.Based on the seepage theory of gas-water two phase,this paper established a motion equation of gas-water two phase,defined the start-up pressure gradient and generalized pseudopressure of gas-water two phase,considered the effect of stress sensitivity,slippage effect,inertia turbulent effect and skin effect on the productivity of gas-water horizontal well,used the conformal mapping method to deduce a new trinomial productivity formula of horizontal well with gas-water two phase in low permeability gas reservoir.Case study shows the relative error between results calculated by new formula and actual test is very small,only 5.13%,which indicates the new formula is accurate and reliable.More ever,sensitivity analysis shows the water-output will become bigger as the increase of slippage and water-gas mass ratio,while it will become smaller as the increase of start-up pressure gradient and stress sensitivity index.However,the effect of start-up pressure gradient on water-output is very small,especially the bottom hole flowing pressure is very low,so its effect can be ignored.

Key words： Low-permeability; Horizontal well; Gas-water two phase; Water-output; Start-up pressure gradient; Stress sensitivity; Slippage; Water-gas mass ratio

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