Shale gas horizontal well refracturing assessment method

Abstract

The invention discloses a shale gas horizontal well refracturing assessment method and belongs to the field of oil and gas reservoir yield increase technology. The method comprises the steps that values of assessment indexes of each of n to-be-assessed wells are determined, wherein the to-be-assessed wells are refractured shale gas horizontal wells, and the assessment indexes include reservoir quality, completion quality and production performance of the to-be-assessed wells; normalized values of the assessment indexes of each to-be-assessed well are calculated; and a refracturing assessment value of each to-be-assessed well is calculated according to the formula (shown in the description), wherein RF is the refracturing assessment value of the i(th) to-be-assessed well, R is the value of the reservoir quality of the i(th) to-be-assessed well, C is the value of the completion quality of the i(th) to-be-assessed well, P is the value of the production performance of the i(th)to-be-assessed well, the symbols (shown in the description) are the normalized values of R, C and P respectively, i is an integer and is greater than or equal to 1 and smaller than or equalto n, and n is greater than or equal to 2. Through the method, refracturing assessment can be performed on the shale gas horizontal wells quantitatively, and the defect that an assessment result has high subjectivity when weights are set according to experience is effectively overcome.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir stimulation, in particular to an evaluation method for repeated fracturing of shale gas horizontal wells. Background technique [0002] At present, horizontal wells and volume fracturing technologies are key technologies for the efficient development of shale gas. As multiple batches of fractured shale gas horizontal wells are put into production, the production effects of each fractured well under the same geological conditions show great differences. For fractured wells with poor production effects, experience in foreign shale gas development shows that refracturing is an effective means to improve production effects. Refracturing is a way to perform fracturing operations again or multiple times on the basis of the original fracturing well. An important factor that determines the successful stimulation of a fractured well after refracturing is the condition of the fractured well ...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem in the prior art that the weight of the evaluation factors is artificially set, which affects the evaluation results and leads to the limited application of the evaluation method, the embodiment of the present invention provides an evaluation method for refracturing of shale gas horizontal wells

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