Title

Design of Operating Parameters in MB8 Gas Storage with Edge and Bottom Water

作者

龚瑞程王爱明陈芳芳于海涛刘金滚

Authors

GONGRuicheng WANGAiming CHENFangfang YUHaitao LIUJingun

单位

中国石油青海油田采气二厂, 甘肃敦煌 736200 中国石油青海油田勘探开发研究院, 甘肃敦煌 736200 中国石油青海油田采气三厂, 甘肃敦煌 736200

Organization

No.2 Gas Production Plant, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736200, China Exploration and Development Research Institute, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736200, China No.3 Gas Production Plant, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736200, China

摘要

边底水在储气库运行过程中会影响气井注采能力和调峰能力，国内外中等强度边底水气藏改建天然气地下储气库的案例比较少。针对青海气田MB8井区中等强度边底水特点，改建储气库时应考虑注采过程中地层水对库容与渗流的影响。基于气井气水产出特征优选注采井井型，采用水驱气藏物质平衡方程评价储气库库容，考虑气水两相渗流评价单井注采能力，同时采用数值模拟方法研究注采过程中边底水运移状况。研究表明，MB8井区改建天然气地下储气库具备可行性，可通过增加井数、降低单井注采量、优化井位部署等方式，减小边底水对储气库运行的影响；考虑边底水的影响，MB8井区改建天然气地下储气库的有效工作气量为1.7$\times$10$^8$ m$^3$，合理注采井数20口，运行压力区间为8.1$\sim$10.9 MPa。

Abstract

The edge-bottom water will affect the injection and production capacity and peak production of gas wells during gas storage operation. There are few cases of underground gas storage building from medium-strength edge-bottom water gas reservoirs at home and abroad. In accordance with the medium intensity edge-bottom water in Wellblock MB8, the formation water will make influence on storage capability when building a gas storage. We evaluate well type by optimizing of gas-water characteristics of injection-production wells, assess gas storage capacity by material balance equation of water drive gas reservoir, analyze well injection-production capacity considering gas-water two phase seepages, and study edge-bottom water transport conditions in the process of injection-production with numerical simulation method. The study shows that it is feasible to transform underground gas storage in Wellblock MB8, and the influence of edge and bottom water on gas storage operation can be reduced by increasing the number of wells, reducing the injection and production of single well, and by optimizing the well location. Considering the influence of edge and bottom water, the effective working gas in MB8 gas storage is 170 million cubic meters, the reasonable number of injection and production wells is 20, and the operating pressure range from 8.1$\sim$10.9 MPa.

关键词：

储气库; 边底水气藏; 运行参数; 注采能力; 库容;

Keywords:

gas storage; edge and bottom water gas reservoirs; operating parameters; injection-production capability; storage capacity;

基金项目

DOI

10.11885/j.issn.1674-5086.2021.06.18.01

MB8边底水气藏储气库运行参数设计