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A low-temperature activator and low-temperature fracturing fluid system

A technology of fracturing fluid and activator, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problems of inability to break the gel or the long time of breaking the gel, high residue content, incomplete gel breaking, etc., and achieve easy Large-scale production, simple preparation process and good application prospects

Active Publication Date: 2021-05-18
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a low-temperature activator for improving production of low-temperature reservoirs and a low-temperature fracturing fluid system composed of the low-temperature fracturing fluid system, which overcomes the problem that the current fracturing fluid system cannot break the gel or takes a long time to break the gel in the low-temperature reservoir. Disadvantages and problems of incomplete glue and high residue content

Method used

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  • A low-temperature activator and low-temperature fracturing fluid system
  • A low-temperature activator and low-temperature fracturing fluid system
  • A low-temperature activator and low-temperature fracturing fluid system

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preparation example Construction

[0049] The embodiment of the present application further provides a method for preparing the above-mentioned low-temperature fracturing fluid. The addition amount of each component is determined according to the above-mentioned low-temperature fracturing fluid ratio. The preparation steps include:

[0050]S1. Add the primary hydroxypropyl guar gum into the water under stirring condition, and keep stirring for 10 minutes to obtain the first mixed solution.

[0051] S2. After stirring the first mixed solution, adding the clay stabilizer, drainage aid and low-temperature activator into the first mixed solution in sequence to obtain a second mixed solution.

[0052] S3. After stirring the second mixed solution, adding the gel breaker into the second mixed solution to obtain a third mixed solution.

[0053] S4. During the process of fully stirring the third mixed solution, adding the organoboron crosslinking agent into the third mixed solution to obtain a fourth mixed solution. St...

Embodiment 1

[0062] This embodiment provides a low-temperature activator and low-temperature fracturing fluid.

[0063] A low-temperature activator. In parts by weight, 8 parts of polyamine compounds, 25 parts of small-molecular organic amines and 35 parts of water are compounded to obtain a low-temperature activator, wherein 25 parts of small-molecular organic amines are composed of 8 parts of ethylenediamine , 10 parts of triethanolamine and 7 parts of urea.

[0064] Prepare the low-temperature fracturing fluid according to the preparation method of the aforementioned low-temperature fracturing fluid, wherein the proportioning and composition of the low-temperature fracturing fluid are: in parts by weight, 1.0 parts of low-temperature activator; hydroxypropyl guar gum (first grade) 0.25 parts; 0.25 parts of organic boron crosslinking agent; 1.2 parts of clay stabilizer; 1.2 parts of drainage aid; 0.08 parts of gel breaker; 100 parts of clear water.

[0065] The prepared low-temperature ...

Embodiment 2

[0067] This embodiment provides a low-temperature activator and low-temperature fracturing fluid.

[0068] A low-temperature activator, in parts by weight, is obtained by compounding 12 parts of polyamine compounds, 37 parts of small-molecule organic amines and 44 parts of water, wherein 37 parts of small-molecule organic amines are composed of 13 parts of ethylenediamine , 14 parts of triethanolamine and 10 parts of urea.

[0069] Prepare the low-temperature fracturing fluid according to the preparation method of the aforementioned low-temperature fracturing fluid, wherein the proportioning and composition of the low-temperature fracturing fluid are: in parts by weight, 0.5 parts of low-temperature activator; hydroxypropyl guar gum (first grade) 0.15 parts; 0.20 parts of organic boron crosslinking agent; 0.8 parts of clay stabilizer; 0.8 parts of drainage aid; 0.03 parts of gel breaker; 100 parts of clear water.

[0070] The prepared low-temperature fracturing fluid was plac...

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Abstract

The invention discloses a low-temperature activator and a low-temperature fracturing fluid system. The low-temperature activator is compounded by polyamine compounds, small molecular organic amines and water. The low temperature fracturing fluid is composed of low temperature activator, hydroxypropyl guar gum (first grade), organic boron crosslinking agent, clay stabilizer, drainage aid and gel breaker. When the low-temperature fracturing fluid is used in low-temperature reservoir fracturing reconstruction at 5°C to 52°C, by adjusting the amount of low-temperature activator, the gel-breaking time of the low-temperature fracturing fluid can be controlled within the range of 2h to 12h, and the gel-breaking fluid Viscosity decreases, apparent viscosity ≤ 5mPa·s, residue content ≤ 200mg / L.

Description

technical field [0001] The invention relates to a low-temperature activator and a low-temperature fracturing fluid system, belonging to the field of oil field stimulation and transformation. Background technique [0002] In recent years, most of my country's onshore and offshore proven reserves are low (ultra-low, ultra-low) permeability oil and gas reservoirs, including a considerable amount of coalbed methane, tight oil / gas, shale oil / gas, natural gas hydrate, etc. Regular oil and gas reservoirs. A considerable part of the unconventional reservoirs has the characteristics of shallow burial and low reservoir temperature. For example, in Shanxi Changzhi Coalbed Methane, the well depth is generally 800m-1000m, and the reservoir temperature is 20°C-25°C; the Tuha Santang Lake block generally has a well depth of about 1500-1700m, and a well temperature of only 40°C-55°C, which belongs to the low-temperature, low-porosity and low-permeability type. Reservoirs: Natural gas hydra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/90
CPCC09K8/68C09K8/685C09K8/905
Inventor 张明锋王宇宾徐鸿志郝志伟赵文娜张鹏远张硕王天驹王蕊宋宇飞
Owner BC P INC CHINA NAT PETROLEUM CORP
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