Selection method of low-permeability gas reservoir interference well testing well

Abstract

The invention discloses a selection method of a low-permeability gas reservoir interference well testing well. The selection method comprises the steps that basic parameters of a low-permeability gasreservoir well pair are obtained; the response time of an observation well in the well pair is calculated according to the basic parameters; the basic parameters are imported into well testing analysis software, and simulation calculation is performed to obtain a well bottom pressure curve of the observation well; the inflection point time from well opening work of an active well to falling of theobservation well pressure curve in the observation well bottom pressure curve is obtained; the descending time required for descending the pressure of the observation well by 0.02 MPa from the momentof the inflection point time in the well bottom pressure curve of the observation well is read; and the response time and the falling time are taken as evaluation parameters, evaluation indexes are established, and quantitative grading judgment is carried out on whether the well pair is suitable for interference well testing or not. According to the selection method, by optimizing the observationwell pair, the success rate of interference well testing, the integrity of testing data and the reliability degree of interpretation results are improved. The test time is greatly saved, the implementation of the scheme is facilitated, and the test risk is reduced.

Description

technical field [0001] The invention relates to a method for selecting a low-permeability gas reservoir interference test well test well, belonging to the field of oil and gas exploration and development. Background technique [0002] With the continuous development of oil and gas fields, geological conditions and well pattern layout have become more and more complex. In order to determine the connectivity between wells and solve reservoir parameters, the study of interference well test analysis methods has attracted the attention of experts at home and abroad. By interfering with well testing, it is possible to determine the connection between two wells (connectivity relationship, degree), solve the physical parameters of formation seepage between wells, judge the sealing of faults, evaluate reserves, and determine the plane distribution state of reservoirs , Determine the vertical connectivity of the reservoir, explore the anisotropy of the reservoir, determine the directi...

AI Technical Summary

Problems solved by technology

[0003] Due to the small range of pressure change in the interference well test, for gas reservoirs, the natural gas as the pressure propagation medium has high compressibility, so that it is difficult for the pressure signal to propagate to the observation well, and the reservoir permeability of the low-permeability gas reservoir is small, so the interference Test time for well testing can often last a long time

Especially when the bottom hole pressure drops, it is difficult to identify the pressure interference signal of the excited well. In addition, due to the economic benefit of the oil field, it is often difficult to achieve early shutdown and stable pressure.

It can be seen that the test time and the quality of the test data of the interference well test are affected by many factors, and the poor quality gas well test data cannot be effectively interpreted by the interference well test.

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