Intermittent opening gas well shut-in time determination method and system

Abstract

The invention provides an intermittent opening gas well shut-in time determining method. The intermittent opening gas well shut-in time determining method comprises: generating a casing pressure recovery coefficient of a current intermittent gas well according to current intermittent gas well parameters obtained in advance; and determining the optimal well shut-in time of the current intermittent gas well according to the casing pressure recovery coefficient of the current intermittent gas well, the casing pressure of the current intermittent gas well and the optimal well shut-in time standard chart corresponding to the type of the current intermittent gas well. The productivity of the intermittent gas well can be further fully exerted, and the well opening time rate and yield of the intermittent gas well are improved.

Description

technical field [0001] The invention relates to the technical field of gas reservoir engineering, in particular to a method and system for determining the shut-in time of an intermittent gas well. Background technique [0002] Tight sandstone gas reservoirs play a pivotal role in natural gas reserves and are one of the important resources for the rapid development of natural gas. The Sulige gas field is a typical tight sandstone gas reservoir with tight reservoirs and strong heterogeneity. With the deepening of development, the number of gas wells has increased year by year, and the proportion of low-yield gas wells has exceeded 60% and the proportion has increased year by year. The vast majority of low-yield gas wells adopt intermittent production because they cannot produce continuously. A reasonable splitting system can increase the operating time rate of splitting gas wells and give full play to the productivity of gas wells. At present, the methods for determining the...

AI Technical Summary

Problems solved by technology

At present, the methods for determining the working time of interspersed gas wells mainly include test method and simulation method. The test method has a long cycle and the single well is scattered, which affects the productivity of interspersed gas wells. The single well mechanism model of the simulation method is difficult to truly describe the actual reservoir. The research results are difficult to be consistent with the actual situation, and it is difficult to guarantee the productivity of the intermittent gas well during the application process; both of these two methods have certain limitations, and there are certain restrictions on the productivity of the intermittent gas well.

At present, each gas production unit in the Changqing gas region has different positions for inter-split gas wells, resulting in large differences in the optimization of inter-split gas wells. Most of the systems adopted the empirical method, and did not evaluate its rationality, which also has a certain impact on the productivity of intersecting gas wells

Images