Ultra-high pressure gas reservoir production dynamic abnormal data diagnosis and correction method

Abstract

The present invention provides an ultra-high pressure gas reservoir production dynamic abnormal data diagnosis and correction method. The linear relationships between high-pressure stage normalization pseudo-pressure p and pressure p, and between high-pressure stage normalization pseudo-pressure p and apparent formation pressure p / z are adopted, the normalization pseudo-pressure yield qg / Delta p and substance balance pseudo-time t<ca> in Pslacio-Blasingame and Agarwal-Gardner decline curves are simplified, a standard flow characteristic curve of an ultra-high pressure gas well is established; the actual production curve of the ultra-high pressure gas well is compared with the standard flow characteristic curve of the ultra-high pressure gas well, so as to judge whether the actual production curve of the ultra-high pressure gas well is abnormal or not and judge the causes of abnormity. The calculation process of the established standard flow characteristic curve of the ultra-high pressure gas well is simple and the work load is small, and the calculation process facilitates on-site application; establishment of the ultra-high pressure abnormal well well-bottom flow pressure tracking and correction method considers the effects of change in the number of the communicated gas reservoir production wells and the gas well production adjustment on well controllable reserves, and thus the forecast result error is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development and analysis, in particular to a method for diagnosing and correcting abnormal production dynamic data of ultra-high pressure gas reservoirs. Background technique [0002] The Dina ultra-high pressure gas field in the Tarim Basin is the main gas field of the West-to-East gas transmission, with a buried depth of about 5000m and an original formation pressure of 106MPa. After the gas wells in this gas field were put into production for a period of time, due to the blockage of the screen at the bottom of the tubing, the flow pressure at the bottom of the metering hole changed abnormally, and the flow pressure dropped suddenly, and the pressure change did not match the production. Abnormal wells account for a large proportion and last for a long time. This ubiquitous abnormal phenomenon conceals the real production characteristics of gas wells, making it impossible to evaluate th...

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Problems solved by technology

However, the calculation process of this standard characteristic curve is complicated and the workload is heavy, which is not conducive to daily mine analysis and calculation, and is limited in practical application

In addition, in terms of tracking and correction of production data, due to the short normal production time of gas wells, the influence of changes in the number of production wells in connected gas reservoirs and production adjustment of gas wells on well controlled reserves cannot be considered when using the existing single well simulation method to calculate bottomhole flow pressure , so that the predicted flow pressure is inconsistent with the change trend of normal well flow pressure, which does not conform to the characteristics of connected gas reservoirs, and the error of prediction results is large

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