Method for optimizing shut-in time of intermittent well of tight gas reservoir, and device

By analyzing the relationship between casing pressure data and shut-in time, a pressure drop rate model was established to optimize shut-in time, solving the problem of poor production reliability of intermittent wells in tight gas reservoirs in existing technologies, and achieving an improvement in gas well production efficiency and an increase in gas production.

WO2026113810A1PCT designated stage Publication Date: 2026-06-04CHINA NAT PETROLEUM CORP
View PDF 5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2025-10-29
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing technologies, when optimizing the shut-in time of intermittent wells in tight gas reservoirs, cannot effectively take into account actual conditions such as wellbore fluid accumulation and pipeline freezing, resulting in poor gas well production reliability and difficulty in meeting the actual production needs of natural gas.

Method used

By acquiring casing pressure data after well shut-in, analyzing the relationship between casing pressure and shut-in time, establishing a pressure drop rate model, determining the casing pressure recovery rate threshold, and optimizing shut-in time, gas well production data can be collected in real time to reflect the impact of wellbore fluid accumulation and pipeline freezing.

Benefits of technology

It improved the production efficiency of intermittent gas wells in tight gas reservoirs and enhanced the production capacity of gas wells. The optimized shut-in time scheme increased the average daily gas production by 14% in practical applications.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN2025131032_04062026_PF_FP_ABST
    Figure CN2025131032_04062026_PF_FP_ABST
Patent Text Reader

Abstract

A method for optimizing a shut-in time of an intermittent well of a tight gas reservoir, and a device. The method comprises: acquiring casing pressure data after shut-in and shut-in durations corresponding to the casing pressure data; acquiring the change trend of the shut-in durations and determining a casing pressure recovery rate threshold on the basis of the casing pressure data, the change trend and a gas well pressure stabilization standard; performing a curve fitting operation on the casing pressure data and the shut-in durations to establish a pressure drop rate model; and obtaining an optimized shut-in duration on the basis of the pressure drop rate model, fitted curve parameters and the casing pressure recovery rate threshold. By collecting production data of a gas well in real time, the real-time production data of the gas well reflects the influence on gas well production when wellbore liquid loading and piping freeze blockage occur during an actual production process of an intermittent gas well of a tight gas reservoir, and has strong reliability, thereby improving the production efficiency of the intermittent gas well of the tight gas reservoir, and fully utilizing the production capacity of the intermittent gas well.
Need to check novelty before this filing date? Find Prior Art