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A combined method of deflagration fracturing and acidification

A technology of fracturing acidification and deflagration, which is applied to chemical instruments and methods, earthwork drilling, wellbore/well components, etc., which can solve the problems of lack of adaptability and flexibility, so as to save operation steps, ensure operation effect, The effect of enhancing the effect

Active Publication Date: 2018-12-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN101113669A published "A Fracturing Method for Improving the Productivity of Low-permeability Reservoirs". This method is mainly used to improve the productivity of low-permeability reservoirs. Effective combination of , acid, etc., to enhance the effect of conventional fracturing, without adaptability and flexibility
[0005] To sum up, until now, there is still a lack of a deflagration and fracturing combined operation method suitable for electric pump production strings, sandstone and carbonate reservoirs, and can select subsequent acidizing operations according to the deflagration fracturing conditions.

Method used

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  • A combined method of deflagration fracturing and acidification
  • A combined method of deflagration fracturing and acidification
  • A combined method of deflagration fracturing and acidification

Examples

Experimental program
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Effect test

Embodiment 1

[0118] The combination of deflagration, fracturing and acidification in Well 26H in LF13-1 Oilfield has been applied figure 2 The shown deflagration fracturing string and image 3 is the acidified column shown.

[0119] The amount of deflagration fracturing powder described in step (1) is 40kg, and the peak pressure generated by simulating 40kg is 60MPa. The formation fracture pressure of this well is 45.5MPa, and the peak pressure is 1.3 times the formation fracture pressure. Pressure is 47.3MPa, satisfying P 峰 -P 破 套抗 ; The acidification slug is shown in Table 1.

[0120] Table 1 Acid fluid slug consumption table of Well 26H in LF13-1 Oilfield

[0121]

[0122] The acid treatment radius is designed to be 1.3m; acidification construction pressure P≤16MPa; construction displacement 0.1-1.5m 3 / min, under the condition of limited construction pressure, the displacement should be increased as much as possible; see Figure 5 .

[0123] The acid solution slug described ...

Embodiment 2

[0131] The combination of deflagration, fracturing and acidification in well 6 of LF13-1 oil field was applied Figure 4 The Y column and Figure 5 The straight pipe column described above.

[0132] The amount of deflagration fracturing powder described in step (1) is 20kg, and the peak pressure produced by simulating 20kg is 50.2MPa. The formation fracture pressure of this well is 44.6MPa, and the peak pressure is 1.1 times the formation fracture pressure. Internal pressure is 56.2MPa, satisfying P 峰 -P 破 套抗 ; The acidification slug is shown in Table 2.

[0133] Table 2 Acid fluid slug consumption table of well 6 in LF13-1 oilfield

[0134]

[0135] The acid treatment radius is designed to be 2.0m; acidification construction pressure P≤15.86MPa; construction displacement 0.1-1.5m 3 / min, under the condition of limiting the construction pressure, the displacement should be increased as much as possible.

[0136] The acid solution slug described in the step (10) compri...

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Abstract

The invention discloses a method for detonation fracture acidizing combined operation. The method comprises the steps of optimizing detonation fracture acidizing combined operation process parameters, performing operation preparation before detonation fracture and filling a pitshaft with liquid, testing stratum absorption amount before the detonation fracture, placing a detonation fracture operation tubular column to a predetermined operation depth, performing pressurization detonation of the tubular column, performing well killing operation, detonating the fracture operation tubular column, testing the stratum absorption amount after the detonation fracture, placing an acidizing operation tubular column, performing pumping injection acid liquid slug, lifting the acidizing operation tubular column, placing an electric pump production tubular column and performing electric pump liquid drainage and well opening alkalifying neutralization, placing an electric pump production Y tubular column without a Y tubular column, performing pumping injection of acid liquid slug, placing the Y tubular column, performing electric pump liquid drainage and well opening alkalifying neutralization and the like. The method has the advantages that detonation fracture and acidizing effects can be further enhanced, the acid liquid injection capability is enhanced, the acidizing radius is expanded, crack closure is further avoided, and a physical effect is enhanced; a detonation fracture effect can be enhanced, a follow-up acidizing step is selected flexibly, and the operation step is omitted while an operation effect can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of oil and gas field stratum acidification and fracturing reconstruction, and more specifically, the invention relates to a deflagration fracturing and acidification combined method in the technical field. Background technique [0002] Deflagration fracturing, also known as high-energy gas fracturing, is a technical means of fracturing formations by using gunpowder or propellant combustion to generate high-temperature and high-pressure gas. Acidizing technology is also a commonly used technical means in oilfield stimulation measures. [0003] At present, domestic oilfields combine deflagration fracturing and acidizing, that is, use physical and chemical compound methods to increase production. Physical is deflagration fracturing, which can form radial multi-fracture oil flow channels in the formation, enhance the ability of acid liquid injection, and expand the radius of acidification; chemical is acidizing,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/263E21B43/27C09K8/66C09K8/72
CPCC09K8/66C09K8/72E21B43/26E21B43/263
Inventor 孙林杨万有易飞黄波刘春祥杨军伟陈庆栋
Owner CHINA NAT OFFSHORE OIL CORP
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