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Method and device for optimizing and improving rock stratum fracturing permeation enhancement based on fracturing fluid viscosity

A fracturing fluid and viscosity technology, applied in the field of oil and gas wells, can solve the problems of incompletely developed fracturing fluid viscosity to form complex fractures, etc., and achieve the effects of simple structure, accelerated formation time, and convenient use.

Active Publication Date: 2022-05-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current fracturing permeability enhancement technology has not fully exploited the potential of using fracturing fluid viscosity to form complex fractures

Method used

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  • Method and device for optimizing and improving rock stratum fracturing permeation enhancement based on fracturing fluid viscosity
  • Method and device for optimizing and improving rock stratum fracturing permeation enhancement based on fracturing fluid viscosity
  • Method and device for optimizing and improving rock stratum fracturing permeation enhancement based on fracturing fluid viscosity

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Experimental program
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Effect test

Embodiment 1

[0077] like figure 1 As shown, the method for improving rock formation fracturing and permeability enhancement based on fracturing fluid viscosity optimization according to the present invention includes the following steps:

[0078] S1: Select at least two fracturing fluids with different viscosities. Specifically, it includes: obtaining the average value of the physical and mechanical parameters of the rock formation through logging; obtaining the fracturing pressure and flow rate of a fracturing fluid of a specified viscosity through the first fracturing; and determining at least two fracturing fluids with different viscosities according to these parameters.

[0079] S2: The injection time interval of the designed high and low pressure fracturing fluid. Specifically, it includes: estimating the area of ​​the fracturing fracture envelope through the estimated volume of the reformed area through real-time detection of fracturing; designing the fracturing fluid injection tim...

Embodiment 2

[0085] figure 2 It is a schematic diagram of the principle of shear stress fracturing on the fracture surface. The high viscosity fracturing fluid 4 and the low viscosity fracturing fluid 3 flow in the fracture surface one after the other, generating shear stress on the wall surface of the rock mass 1 .

[0086] Since the flow rates of the two fracturing fluids are almost the same, the shear stress 8 of the high-viscosity fluid is greater than the shear stress 7 of the low-viscosity fluid, there is a shear stress difference at the interface 5 of the two fracturing fluids, and the shear stress difference is further formed inside the rock mass 1 along the flow Tensile stress in direction 6; continue to inject fracturing fluid, fracturing fluid interface 5 flows forward, when fracturing fluid interface 5 moves to weak surface 2 of the rock mass, if the tensile stress is enough to overcome the confining pressure and the weak surface binding force, A new crack face will be formed ...

Embodiment 3

[0118] like Figure 5 The principle structure block diagram of the device of the present invention is shown, including a high-viscosity fracturing fluid tank, a low-viscosity fracturing fluid tank, and a fracturing fluid supply system. The low-viscosity fracturing fluid is built in the fluid tank, and the high-viscosity fracturing fluid and the low-viscosity fracturing fluid are respectively injected into the wellbore intermittently with different viscosities of fracturing fluids through the fracturing fluid supply system.

[0119] The fracturing fluid supply system consists of pumps, pressure gauges, flow meters, servo regulators, and timing control valves located between the high viscosity fracturing fluid tanks and the low viscosity fracturing fluid tanks.

[0120] In addition, the operating steps of the fracturing fluid supply system are as follows:

[0121] a. Select the fracturing fluid through step S1 and put it into the high-viscosity fracturing fluid tank and the low...

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Abstract

The invention relates to a method and a device for improving rock stratum fracturing and permeation enhancement based on fracturing fluid viscosity optimization, and belongs to the technical field of oil and gas wells. The method comprises the following steps: S1, selecting at least two fracturing fluids with different viscosities; s2, designing the injection time interval of the high fracturing fluid and the low fracturing fluid; s3, designing proper injection flows in different time periods; s4, fracturing fluids with different viscosities are alternately injected according to the parameters; and S5, continuously optimizing the fracturing process design according to the real-time monitoring data of fracturing. According to the method, a device comprises a high-viscosity fracturing fluid tank, a low-viscosity fracturing fluid tank and a fracturing fluid supply system, high-viscosity fracturing fluid is contained in the high-viscosity fracturing fluid tank, and low-viscosity fracturing fluid is contained in the low-viscosity fracturing fluid tank; the high-viscosity fracturing fluid and the low-viscosity fracturing fluid are intermittently injected into the shaft through the fracturing fluid supply system. According to the invention, the number and density of fractures generated in a rock stratum by a fracturing process can be improved, and a stronger permeation enhancing effect is achieved.

Description

technical field [0001] The invention relates to a method and a device for improving rock formation fracturing and permeability enhancement based on the optimization of fracturing fluid viscosity, belonging to the technical field of oil and gas wells. Background technique [0002] The application of fracturing and permeation enhancement technology is widely used in fields such as oil and gas development, especially the permeation enhancement of low-permeability and ultra-low-permeability reservoirs, such as the development of shale oil and gas, coalbed methane, and tight gas. The principle of fracturing and permeability enhancement is: by injecting fracturing fluid into the rock formation, overcoming the confining pressure and rock fracture toughness to do work, opening one or several artificial fractures, forming a flow dominant channel, and achieving the purpose of increasing permeability. In order to keep artificial fractures from closing under the action of confining pres...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 沈文豪王重王晨龙焦志明王志华
Owner TAIYUAN UNIV OF TECH
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