Interpretation and evaluation method for downhole distributed temperature monitoring production profile of multilayer gas reservoir

Abstract

The invention discloses an interpretation and evaluation method for a downhole distributed temperature monitoring production profile of multilayer gas reservoir. The method comprises the following steps that downhole distributed temperature monitoring data under a target well are obtained; the downhole distributed temperature monitoring data are preprocessed; the temperature data are segmented according to the test curve characteristics and the well logging interpretation result of the target well; a numerical simulation method is adopted to calculate the temperature of each layer of the production profile of a target well rockshaft by using a seepage pressure field-temperature field model of the multi-layer gas reservoir; and the temperature of each layer of the production profile of therockshaft is compared with the segmented temperature data, and the optimal production flow of each layer is obtained through an optimization theory to obtain the production profile of the target well.Based on the gas state equation, the mass conservation and the energy law, the production profile evaluation method is proposed by coupling a seepage pressure field and a temperature field of the gasreservoir, the production profile of a gas well can be accurately obtained, and the method has important practical significance for fine description of the production of domestic high-temperature high-pressure multilayer gas reservoir and improvement of exploration and development benefits.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a method for interpreting and evaluating production profiles of distributed temperature monitoring in multi-layer gas reservoirs. Background technique [0002] How to obtain the production profile of oil and gas wells in real time, efficiently and accurately has always been a bottleneck problem concerned by petroleum engineering technicians. Although the production profile testing technology based on production logging can determine the production of downhole fluid, there are still many problems, such as long monitoring time, poor continuity of timeliness, removal of the instrument affects the smooth operation of oil and gas well production; the size of the monitoring instrument Large, poor well type adaptability; large error in monitoring results, high cost, etc. In recent years, exploratory wells in the Tarim Basin and Yinggehai Basin in my country...

AI Technical Summary

Problems solved by technology

Although the production profile testing technology based on production logging can determine the production of downhole fluid, there are still many problems, such as long monitoring time, poor continuity of timeliness, removal of the instrument affects the smooth production of oil and gas wells; the size of the monitoring instrument Large, poor well type adaptability; large errors in monitoring results, high cost, etc.

In recent years, exploration wells in the Tarim Basin and Yinggehai Basin in my country have shown ultra-high temperature and high pressure characteristics. Traditional production profile monitoring tools cannot meet the production profile test under extreme working conditions, which has seriously affected the production capacity of reservoirs in exploration areas. accurate understanding

At present, there is no interpretation and evaluation method for the production profile of the downhole distributed optical fiber temperature monitoring of high temperature and high pressure multi-layer gas wells

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