A Fast Equivalent Simulation Method for Refracturing in Tight Oil Reservoirs

Abstract

The invention provides a rapid simulation method for repeated fracturing in SRV areas combined with microseismic monitoring data, which belongs to the field of oil reservoir numerical simulation technology, and includes the following steps: based on the oil reservoir geological model established by the geological modeling software Petrel, using Petrel RE Establish a fine-grid numerical simulation model of oil-water two-phase in tight reservoirs; consider the initial fracturing, carry out production dynamic history matching before repeated fracturing; based on the numerical simulation Case after history fitting, establish a restart numerical simulation model, and carry out vertical well Water injection energy simulation before refracturing; based on the attribute field of the model after water injection and combined with microseismic monitoring data during refracturing, establish the SRV area after refracturing; use the enumeration method to initialize the model and carry out repeated fracturing Prediction of production performance of fractured oil wells. By using the solution of the present invention, considering the SRV region, the evaluation of the refracturing effect and the production prediction of vertical wells in tight oil reservoirs can be quickly realized, thereby guiding the design of the fracturing scheme of the subsequent refracturing wells.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir numerical simulation, in particular to a method for equivalent simulation of repeated fracturing of vertical wells and post-fracture production prediction combined with microseismic monitoring results. Background technique [0002] Tight oil reservoirs have extremely low natural productivity and must use hydraulic fracturing technology to obtain industrial oil flow. However, after the initial fracturing, the depleted development of tight oil reservoirs has the characteristics of rapid decline in pressure and production. In order to improve oil well production and block recovery, when the production declines to a certain stage, refracturing technology can be used to improve oil well productivity. During repeated fracturing, large-scale water injection before fracturing can be used to supplement the formation energy, multiple temporary plugging of fractures, and diversion in fractures. Crack...

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Problems solved by technology

However, it is very difficult to realize the description of volume fracturing fracture network by using the local grid refinement method and unstructured grid method, and the simulation operation speed will be greatly reduced due to the difference in grid scale and shape.

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