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A method for realizing self-supporting fractures in rock

A self-supporting, rock-based technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of fast decline and low fracture conductivity

Active Publication Date: 2021-09-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] 2) Fractures have low conductivity and rapid decline

Method used

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  • A method for realizing self-supporting fractures in rock
  • A method for realizing self-supporting fractures in rock
  • A method for realizing self-supporting fractures in rock

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Embodiment Construction

[0025] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0026] In order to solve the above problems, according to the combination of fracturing and acidizing construction parameters, the embodiment of the present invention obtains fracture-making injection fluids for different rock types, and further adopts the pulse injection method to construct multiple uniformly distributed non-uniform tunnels, so that without adding In the case of friction resistance, the liqu...

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Abstract

The invention discloses a method for realizing rock self-supporting fractures. The method includes the following steps: a fracture construction step, determining the combination of fracturing and acidizing construction parameters for different rock types, and performing the operation without adding proppant based on the combination of fracturing and acidizing construction parameters. In the fracturing and fracture creation of the fracturing and acidizing construction parameters, the fracturing fluid in the fracturing and acidizing operation parameter combination selects a low-friction and high-viscosity fracturing fluid system. The viscous fingering effect in the injection process; in the tunnel construction step, the deep penetrating hydraulic jet technology is used to spray on the formed fractures to form multiple non-uniform tunnels to achieve the rock self-supporting effect of the fractures. The invention can enlarge the effective fracture length of main fractures, improve the long-term effective flow-conducting capacity of reservoir fractures under high-deep formation and high closure stress, so as to increase the effective period of deep formation measures and improve economic development benefits.

Description

technical field [0001] The invention relates to the technical field of oil and gas well stimulation, in particular to a method for realizing rock self-supporting fractures. Background technique [0002] At present, there are more and more fracturing and acidizing operations in deep sandstone, carbonate rock and shale, and the deep reserves are also quite huge, which has great development prospects. However, in the reconstruction of deep layers, how to maximize the fracture conductivity under high closure stress is the focus and focus of the design. No matter what kind of lithology it is, whether it is the conductivity of hydraulic propped fractures or acid-etched fractures, as long as the effective closure stress exceeds 40 MPa, the fracture conductivity will decrease rapidly. Then lose the value of economical and effective development. [0003] In terms of technology, the current design and construction of deep fracturing and acidizing generally have the following limitat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B43/27
CPCE21B43/267
Inventor 蒋廷学李奎为刘红磊王海涛吴春方周林波刘世华
Owner CHINA PETROLEUM & CHEM CORP
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