Shale gas reservoir fractured horizontal well output profile inversion interpretation method

Abstract

The invention discloses a shale gas reservoir fractured horizontal well output profile inversion interpretation method which comprises the following steps: according to actually measured wellbore parameters, preliminarily estimating the value range of the half length of each stage of fracture; substituting the pre-estimated mid-value of the half length of the crack into the temperature forward modeling prediction model and calculating a fitting evaluation objective function; when the fitting evaluation objective function is greater than the preset precision, performing inversion step by step from the toe end to the heel end; respectively calculating an inversion error function value of the temperature of each crack, and if an error judgment requirement is not met, performing linear interpolation operation and re-assigning until the error judgment requirement is met; and after half-length inversion of all the fractures is completed, outputting a half-length data result of each section of fracture, then substituting the half-length data result into the temperature forward modeling prediction model, and outputting a profile interpretation result. According to the method, the flow contribution of the shale gas reservoir fractured horizontal well production profile fracture and the half length of each stage of fracture can be quantitatively explained by inverting the field actual measurement temperature data.

Description

technical field [0001] The invention relates to an inversion interpretation method for the production profile of a fracturing horizontal well in a shale gas reservoir, and belongs to the technical field of oil and gas reservoir development. Background technique [0002] With the accelerated exploration of shale gas reservoirs in China, more and more shale gas reservoirs have been proven. The main development method of shale gas is the use of horizontal well fracturing technology, so the fracturing effect directly affects shale gas. However, there are many technical difficulties in the evaluation of fracturing effect of fracturing horizontal wells in shale gas reservoirs. Among them, the problems of unclear output profile, fuzzy flow contribution of fractures, and difficulty in quantifying fracture size after fracturing in shale gas reservoirs make it difficult to evaluate the effect of fracturing stimulation, thereby affecting the setting of the later production system and t...

AI Technical Summary

Problems solved by technology

And at present, the distributed optical fiber technology is mainly used to identify the water location and determine the fluid type, and it is rarely used in the study of fracture flow contribution and production profile of fractured horizontal wells in shale gas reservoirs.

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