Dense conglomerate oil reservoir horizontal well refracturing simulation method

Abstract

The invention provides a horizontal well refracturing simulation method for a compact conglomerate oil reservoir. The method comprises the following steps: establishing a geologic model according to oil reservoir data; obtaining an initial fracture network model through UFM fracture propagation simulation, and obtaining a final fracture simulation fracture network form through correction; establishing an unstructured grid numerical simulation model and performing correction through production dynamic simulation; optimizing a water injection scheme through water injection energy increasing simulation, and optimizing soaking time through four-dimensional geological modeling based on the optimized water injection scheme; establishing a fracture network model after refracturing; and establishing a numerical simulation model after refracturing and carrying out refracturing production dynamic simulation. According to the method, the existence of multiple groups of micro-scale natural fracture equivalent gravels is adopted, so that fracture expansion better conforms to the conglomerate oil reservoir; through four-dimensional crustal stress modeling, crustal stress models at different time points are established, and a basis is provided for determining a conglomerate oil reservoir water injection scheme and soaking time after water injection, namely, when to carry out refracturing work according to crustal stress recovery conditions.

Description

technical field [0001] The invention belongs to the technical field of reservoir numerical simulation, in particular to a method for simulating repetitive fracturing of horizontal wells in tight conglomerate reservoirs. Background technique [0002] With the increase of the national energy strategy demand and the improvement of exploration technology, the newly proven oil reserves are gradually increasing, and the types of reservoirs are showing a trend of diversification. It has become another focus of national oilfield development. [0003] Conglomerate reservoirs are deep, low porosity, ultra-low permeability and abnormally high pressure lithologic structural reservoirs. Horizontal well plus volume fracturing technology has been proven to be the key technology for the development of glutenite reservoirs. The primary fracturing operation of horizontal wells The scheme often has a poor matching relationship with the formation and horizontal well trajectory. At the same tim...

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Problems solved by technology

However, for conglomerate reservoirs, the established model cannot simulate the existence of gravel; it cannot give an effective basis for determining the water injection scheme and the time of soaking the well after water injection, that is, when to carry out refracturing work

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