Volume fracturing method for deep complex shale gas

A technology of volume fracturing and shale gas, which is applied in the direction of exploitation fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of high risk and low success rate of volume fracturing, so as to improve the complexity and improve filling The effect of speed and novel ideas

Active Publication Date: 2019-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high risk and low success rate of volume fracturing of deep complex shale gas in the prior art, the present invention provides a method for volume fracturing of deep complex shale gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Well X, with a maximum vertical depth of over 4,000 meters, is a typical deep shale gas well:

[0058] (1) Evaluation of key reservoir parameters

[0059] The carbonate rock content, natural fracture development characteristics, three-dimensional stress characteristics and rock mechanics characteristics of the reservoir were analyzed by means of whole-rock analysis, lithology logging and core in-situ stress test analysis.

[0060] (2) Research on formula of acidic slick water and ground crosslinking acid

[0061] According to the core and underground fluid compatibility experiments of the target layer, the formulation system of acidic slick water and ground cross-linked acid was optimized for parameters such as rheological properties, acid dissolution rate, acid-rock reaction kinetic parameters, and acid-etched fracture conductivity. Among them, the viscosity of acidic slippery water is 3mPa·s, and the viscosity of ground cross-linking acid is 55mPa·s.

[0062] (3) Pe...

Embodiment 2

[0080] Well Y.

[0081] (1) Evaluation of key reservoir parameters

[0082] The carbonate rock content, natural fracture development characteristics, three-dimensional stress characteristics and rock mechanics characteristics of the reservoir were analyzed by means of whole-rock analysis, lithology logging and core in-situ stress test analysis.

[0083] (2) Research on formula of acidic slick water and ground crosslinking acid

[0084] According to the core and underground fluid compatibility experiments of the target layer, the formulation system of acidic slick water and ground cross-linked acid was optimized for parameters such as rheological properties, acid dissolution rate, acid-rock reaction kinetic parameters, and acid-etched fracture conductivity. Among them, the viscosity of acidic slippery water is 5mPa·s, and the viscosity of ground cross-linking acid is 70mPa·s. .

[0085] (3) Perforation position determination and perforation operation

[0086] Perforating op...

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Abstract

The invention discloses a volume fracturing method for deep complex shale gas. The method includes the following steps: (1) performing evaluation on key reservoir parameters; (2) preparing acidic slick-water and ground crosslinking acid; (3) performing perforation position determining and perforation operation; (4) performing optimization on fracture parameters and main parameters of a fracturingtechnology; (5) performing acid pretreatment operation; (6) performing small test fracturing; (7) performing fracture generation construction by using a high viscosity ground crosslinking acid prepadfluid; (8) performing viscous fingering injection construction of the low viscosity acid slick-water; and (9) performing acidic slick-water sand-carrying construction. Therefore, the complexity of volume fracturing fractures of deep complex shale gas can be enhanced, the sand blocking risks of construction can be reduced, the filling rates of near well and far well fracture systems can be increased, the effective reforming volume of the deep complex shale gas can be enhanced, and effects of increasing and stabilizing production after fracturing can be improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a volume fracturing method for deep complex shale gas. Background technique [0002] At present, with the deepening of shale gas exploration and development, the probability of occurrence of deep complex shale gas is increasing. The so-called "complex shale gas" refers to shale gas reservoirs with a carbonate rock content of more than 20% in lithology and a large number of horizontal bedding fractures, texture fractures and high-angle natural fractures (filled or unfilled) in structure. , its complexity can easily lead to out-of-control fracture height of fracturing fractures, and then the net pressure of main fractures is greatly reduced, and it is difficult to achieve the goal of volume fracturing. substantially restricted. In terms of three-dimensional stress characteristics, due to the extrusion of tectonic stress, the minimum horizontal principal stress ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/11
Inventor 蒋廷学侯磊刘建坤吴春方苏瑗吴峙颖黄静左罗
Owner CHINA PETROLEUM & CHEM CORP
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