A shale gas productivity evaluation method based on production logging data

Abstract

The invention discloses a shale gas productivity evaluation method based on production logging data. The steps are as follows: a. Combining dynamic and static geological data and segmental fracturing engineering parameters, comprehensively analyzing the main control factors of shale gas well productivity; b. . Using the productivity data of each fracturing segment and each perforation cluster of the production well measured by production logging, statistically analyze the relative productivity relationship between different sub-layer units; c. Single factor analysis under different fracture development degrees, different Corresponding relationship of production capacity under fracturing scale and different fracturing process conditions; d. Using the production capacity relationship per unit length of different sublayer units under different geological and engineering conditions, calculate the regression between the production in the first year and the actual production, and correct it according to the results and adjust the productivity relationship to determine the final productivity prediction equation. This method is accurate and reasonable in shale gas well productivity prediction results, and at the same time avoids the difficulty of selecting shale gas reservoir parameters, and can quickly and effectively predict the average production of gas wells in the first year.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a shale gas productivity evaluation method based on production logging data. Background technique [0002] In conventional gas reservoirs, the productivity of gas wells is usually evaluated by obtaining the open flow through productivity testing. Specifically, there are back pressure testing methods, isochronous well testing methods, corrected isochronous well testing methods, and "one-point" well testing methods. For shale Gas wells have the characteristics of large initial fracturing fluid flowback, large wellbore pressure fluctuations and difficulty in obtaining, and rapid production decline. Many scholars have carried out many explorations and improvements on the basis of this method, mainly the correction of the empirical coefficient or the binomial However, it is still difficult to accurately estimate the productivity of shale gas wells. In view of th...

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Problems solved by technology

[0002] In conventional gas reservoirs, the productivity of gas wells is usually evaluated by obtaining the open flow through productivity testing. Specifically, there are back pressure testing methods, isochronous well testing methods, corrected isochronous well testing methods, and "one-point" well testing methods. For shale Gas wells have the characteristics of large initial fracturing fluid flowback, large wellbore pressure fluctuations and difficulty in obtaining, and rapid production decline. Many scholars have carried out many explorations and improvements on the basis of this method, mainly the correction of the empirical coefficient or the binomial However, it is still difficult to accurately estimate the productivity of shale gas wells

In view of the characteristics of shale gas staged fracturing and shale gas seepage mechanism, numerical simulation productivity evaluation and analytical method productivity evaluation have gradually become the hotspots of shale gas productivity evaluation research. The simulation of complex shapes has become the main problem it faces, restricting the application and popularization of such methods

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