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Method for forecasting opening pressure, opening sequence and water injection pressure of reservoir fissure

A technology of cracking pressure and water injection pressure, which is applied in the field of oil and gas field exploration and development, and can solve the problem that the development proposal of fractured reservoir cannot be predicted quantitatively.

Inactive Publication Date: 2016-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] The present invention aims to solve the above problems, and provides a method for predicting the opening pressure, opening sequence and water injection pressure of reservoir fractures, which solves the problem that the development suggestions of fractured reservoirs cannot be quantitatively predicted

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  • Method for forecasting opening pressure, opening sequence and water injection pressure of reservoir fissure
  • Method for forecasting opening pressure, opening sequence and water injection pressure of reservoir fissure
  • Method for forecasting opening pressure, opening sequence and water injection pressure of reservoir fissure

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specific Embodiment approach

[0057] The Tongcheng fault zone is located in Jinhu County, Jiangsu Province, structurally located in the Jinhu Sag of Subei Basin, and is a zone-level dextral strike-slip fault in the basin that divides the Longgang-Chajian sub-sag ( image 3 ), on the plane, the Tongcheng fault appears as a linear principal displacement zone, and engraved faults develop on both sides of the main fault; in space, the main fault tends to swing from east to west, showing a "ribbon effect". The main oil and gas producing layer in this area is the Paleogene Funing Formation 2 reservoir. The reservoir has poor physical properties, and the lithology is mainly low-permeability siltstone. Fractures play a vital role in oil and gas seepage.

[0058] The first step is to determine the formation period of fractures and establish a geomechanical model of the work area.

[0059] The high-intensity point of tectonic activity in the Tongcheng area is the late Funing period, and the active faults in this per...

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Abstract

The invention relates to the field of exploration and development of oil and gas fields, in particular to a method for forecasting the opening pressure, the opening sequence and the water injection pressure of a reservoir fissure. According to the method, a geomechanical model is determined through geological data, physical experiments and the like, and on the basis of paleo-stress-field numerical simulation, by means of the rock fracturing criterion and the ancient-and-modern rock-mechanics layer evolution characteristics, the present occurrence of different group fissures is forecasted; on the basis of present-stress-field numerical simulation, the work-area rock-mechanics layer distribution regularities are combined, principal-stress vertical gradients of different nodes are obtained with the rock-mechanics layer-top-bottom-face point searching method, ground stress information and fissure information are synthesized, inversion forecast of the opening pressure, the opening sequence and the water injection pressure of the fissure is achieved. The method is composed of strict mathematical algorithm derivation, after corresponding geological information is digitized, the corresponding calculation procedure can be developed with computer programming languages, forecast cost is low, and operability is high.

Description

technical field [0001] The invention relates to the field of exploration and development of oil and gas fields, in particular to a method for predicting opening pressure, opening sequence and water injection pressure of reservoir fractures. Background technique [0002] During the development of fractured reservoirs, the opening pressure of fractures, opening sequence and fracture pressure of reservoirs are factors that must be considered in formulating oil and gas development plans. The regularity of structural fracture development and reservoir fracture pressure are important guarantees for improving oil and gas recovery and economic benefits. Reasonable water injection pressure of oil and gas wells often cannot exceed the fracture pressure of oil and gas layers, and under this pressure condition, structural fractures must be fully opened to maximize oil and gas recovery benefits. The traditional fracture opening pressure is often based on the fracture development law of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/20E21B49/00
CPCE21B43/20E21B43/26E21B49/00
Inventor 汪必峰刘敬寿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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