Tight gas reservoir fractured horizontal well artificial fracture parameter interpretation method

Abstract

The invention discloses a tight gas reservoir fractured horizontal well artificial fracture parameter interpretation method. The tight gas reservoir fractured horizontal well artificial fracture parameter interpretation method comprises the following steps that an artificial fracture parameter vector is initially assigned, an initial iteration step number is set as k = 0, and an initial damping factor is set as [xi]<0> = 0.001; a shaft temperature profile (please see the specification for the formula) of the current iteration step, a shaft temperature profile inversion error (please see the specification for the formula) of the k inversion iteration, a temperature Jacobian matrix (please see the specification for the formula) of the kth inversion iteration, a temperature diagonal matrix [omega]<k>, and an increment (please see the specification for the formula) of the current iteration step (please see the specification for the formula) are calculated; an inversion crack parametervector (please see the specification for the formula) of the (k+1) iteration step and a shaft temperature profile inversion error (please see the specification for the formula) of the (k + 1) inversion iteration are calculated; whether (please see the specification for the formula) meets one of the inversion iteration termination conditions or not is judged, if one of the inversion iteration termination conditions is met, iteration is stopped; and if one of the inversion iteration termination conditions is not met, k is made to be equal to (k+1), iteration is continued until one of the inversion iteration termination conditions is met, and a current (please see the specification for the formula) is output as an artificial fracture parameter inversion interpretation result. According to the tight gas reservoir fractured horizontal well artificial fracture parameter interpretation method, the measured shaft temperature profile data are inverted, so that artificial fracture parameters of all levels of a tight gas reservoir fractured horizontal well can be quantitatively interpreted.

Description

technical field [0001] The invention relates to a method for interpreting artificial fracture parameters of tight gas reservoir fracturing horizontal wells, belonging to the field of oil and gas exploitation. Background technique [0002] As an important natural gas resource, tight gas reservoirs have very rich reserves in my country. However, due to the low permeability, tightness and complex pore structure of tight gas reservoirs, the production of tight gas in my country is generally low. In order to improve the yield and development benefits of tight gas reservoirs, currently, the exploitation of tight gas reservoirs is mainly carried out by fracturing horizontal wells. Therefore, the artificial fractures formed by hydraulic fracturing are very important for the effectiveness of fracturing stimulation, and directly determine the pressure of tight gas reservoirs. productivity of fractured horizontal wells. In order to ensure the effectiveness of fracturing stimulation f...

AI Technical Summary

Problems solved by technology

[0003] At present, the artificial fracture diagnosis and testing technologies for fracturing horizontal wells mainly include near-well monitoring technology (such as: tracer, warm production logging, etc.) and remote monitoring technology (such as: micro-seismic, etc.). The type of fluid flowing into fractures can provide part of the fracture information near the wellbore zone, but the specific geometric parameters of artificial fractures cannot be obtained from it; the main advantage of remote monitoring technology is to monitor the overall range of hydraulic fracturing pressure response, which has great impact on hydraulic fracturing stimulation. The overall range can be judged intuitively, but the disadvantage is that it is difficult to know the characteristic parameters of effectively supported cracks, and the crack extension range of remote monitoring is much larger than the actual effective artificial crack control range, so the existing conventional testing technology is difficult to directly Measure the specific parameters of each artificial fracture in the fractured horizontal well

However, at present, domestic research on the quantitative interpretation of artificial fracture parameters of fractured horizontal wells in tight gas reservoirs based on the measured wellbore temperature profile data is basically blank.

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