A Method for Determining the Optimum Timing of Refracturing in Group Wells

Abstract

The invention discloses a method for determining the optimal timing of repeated fracturing of group wells, comprising the following steps: Step 1: determining the simultaneous fracturing target area of ​​group wells for repeated fracturing and the remaining oil reserve threshold in the area; if the remaining oil in the area If the reserves are within the threshold range, go to step 2, otherwise exit; step 2: calibrate the reservoir fluid flow model and in-situ stress model; step 3: simulate the points within the determined threshold range; get the simulation results and the corresponding production time, determine the time T inv , determine the time step T 1 * ,T 2 * , T 3 * ; Step 4: Simulate T with the group well hydraulic fracturing simulator 1 * ,T 2 * , T 3 * Time group well refracturing parameters; Step 5: Calibrate T through parameters 1 * ,T 2 * , T 3 * Time-to-time reservoir fluid flow model and in-situ stress model are simulated and calculated; Step 6: Obtain the best refracturing timing of group wells; the method provided by the present invention for the problems existing in the prior art combines economic benefits with low cost and conforms to the actual situation .

Description

Technical field [0001] The present invention relates to the field of unconventional or low-permeability reservoir fracturing technology, specifically to a method of determining the optimal timing of repeated fracturing of group wells. Background [0002] Fracturing of low-permeability reservoirs after well completion has become a necessary step in the effective development of low-permeability reservoirs, especially unconventional reservoirs. However, due to the poor physical properties of low-permeability reservoirs, it is difficult for oil wells and water injection wells to form an effective injection and production well network, and it is impossible to quickly replenish the formation energy. And hydraulic fractures are easy to fail, resulting in rapid yield reduction after the initial fracturing, short stable production period, seriously affecting the development effect, in order to restore the production capacity of such production wells, repeated fracturing such wells is the ...

AI Technical Summary

Problems solved by technology

[0004] Due to the strong heterogeneity of reservoir physical properties in low-permeability or unconventional reservoirs, large differences and complex relationships among parameters such as initial fracturing scale and production performance after well completion, they play different roles in fracturing effects to varying degrees, so It is very difficult to determine the timing of refracturing in group wells

At present, there is no method to determine the optimal timing of refracturing for group wells. Most of the existing methods are methods for determining the timing of refracturing for single wells. methods and equipment"

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