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Method for improving fracture complexity through deep plugging of main fracture of normal-pressure or deep shale gas

A technology for shale gas and main fractures, which is applied in the field of oil and gas field exploration and development, and can solve the problems of difficulty in realizing fracture end sealing technology and poor technical adaptability.

Active Publication Date: 2020-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems that the fracture end plugging technology in normal pressure or deep layer shale gas reservoirs is difficult to realize and the technical adaptability is poor, the present invention proposes a method for deep sealing of main fractures in normal pressure or deep layer shale gas to increase the complexity of fractures, so that In the process of fracture end plugging, the proppant can migrate to the fracture end to the greatest extent, and it is more likely to realize the plugging effect of the proppant at the fracture end, thereby greatly improving the effectiveness of the fracture end plugging technology in shale. Adaptability in gas reservoirs

Method used

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  • Method for improving fracture complexity through deep plugging of main fracture of normal-pressure or deep shale gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Well X, with a maximum vertical depth of 4120 meters, is a typical deep shale gas well:

[0083] (1) Determine the key reservoir parameters of Well X.

[0084]By means of seismic, well logging, mud logging, and core laboratory experiments, etc., the lithology, physical properties (porosity, permeability), rock mechanics parameters, three-dimensional in-situ stress, horizontal bedding fractures and high-angle natural fractures of the target reservoir are analyzed. The development situation, etc. were analyzed for the design of the later construction plan.

[0085] (2) Calculate geological sweet spot and engineering sweet spot.

[0086] On the basis of step (1), the geological sweet spot and engineering sweet spot are calculated according to the conventional method, and the comprehensive sweet spot is calculated according to the equal weight method.

[0087] (3) Optimizing the position of the segment cluster.

[0088] On the basis of step (2), according to the distribu...

Embodiment 2

[0105] Well Y, the well was completed by horizontal well staged fracturing technology.

[0106] (1) Determine the key reservoir parameters of Well Y.

[0107] By means of seismic, well logging, mud logging, and core laboratory experiments, etc., the lithology, physical properties (porosity, permeability), rock mechanics parameters, three-dimensional in-situ stress, horizontal bedding fractures and high-angle natural fractures of the target reservoir are analyzed. The development situation, etc. were analyzed for the design of the later construction plan.

[0108] (2) Calculate geological sweet spot and engineering sweet spot.

[0109] On the basis of step (1), the geological sweet spot and engineering sweet spot are calculated according to the conventional method, and the comprehensive sweet spot is calculated according to the equal weight method.

[0110] (3) Optimizing the position of the segment cluster.

[0111] On the basis of step (2), according to the distribution ch...

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Abstract

The invention discloses a method for improving the fracture complexity through deep plugging of main fractures of normal-pressure or deep shale gas. The method comprises the following steps of: 1, determining key reservoir parameters; 2, calculating geological sweet spots and engineering sweet spots; 3, optimizing the position of a segment cluster; 4, optimizing fracture parameters; 5, optimizingfracturing construction parameters; 6, performing perforation; 7, performing high-viscosity prepad fluid high-displacement fracture construction; 8, determining the highest sand-liquid ratio; 9, continually injecting a propping agent to achieve deep plugging of the fractures; 10, executing other conventional segment plug type sand adding processes in accordance with the parameters in the step 5; and 11, carrying out displacing operation. According to the method, during fracture end plugging, the propping agent can move towards the fracture end to the maximum extent, the plugging effect of thepropping agent at the fracture end can be achieved more possibly, and then the adaptability of the fracture end plugging technology in a shale gas reservoir is greatly improved.

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 deep sealing of main fractures of normal pressure or deep layer shale gas and increasing the complexity of fractures. Background technique [0002] At present, whether it is shale gas under normal pressure or deep shale gas fracturing, the width of the main fracture is narrow. Normal-pressure shale gas is due to the relatively high content of brittle minerals and relatively low fracture toughness, making it difficult to establish net pressure in fractures, resulting in the extension speed of fracture length being much greater than the extension speed of fracture width; High Young's modulus under ground conditions will lead to relatively small fracture width. [0003] When the fracture width is small, the first reason is that the induced stress is small and the complexity of the fracture is difficult to increase. In addition, when the...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/13E21B43/267G06F30/20
CPCE21B43/261E21B43/267E21B33/13
Inventor 蒋廷学刘红磊李洪春周林波侯磊周珺李奎为刘斌彦
Owner CHINA PETROLEUM & CHEM CORP
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