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Guanidine gum fracturing fluid system

A guar gum fracturing fluid and system technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of high fracturing fluid residue content, incomplete gel breaking, etc.

Inactive Publication Date: 2015-04-22
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

[0004] The present invention provides a guar gum fracturing fluid system to solve the technical problem of high fracturing fluid residue content caused by incomplete gel breaking in the traditional guar gum fracturing fluid system

Method used

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  • Guanidine gum fracturing fluid system
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  • Guanidine gum fracturing fluid system

Examples

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Effect test

example 1

[0031] The guar gum fracturing fluid system was used for fracturing operations in sandstone reservoirs with low porosity and low permeability and a well temperature of 120°C.

[0032] Modified guar gum thickener 0.2% and water 99.6% are formulated into fracturing fluid base fluid. Modified guar gum thickener is carboxymethyl modified guar gum with special surface treatment. The appearance is light yellow powder, which belongs to The first-class product stipulated in the industry standard "SY / T5764-2007 General Technical Requirements for Vegetable Glue for Fracturing".

[0033] After it is fully swollen, add in order:

[0034] High-efficiency drainage aid 0.15%, high-efficiency drainage aid is made of perfluorooctyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, methanol or ethanol; 0.2% addition (mass ratio), 30°C Under these conditions, the surface tension is less than or equal to 25.0mN / m, and the interfacial tension is less than or equal to 2.0mN...

example 2

[0040] The guar gum fracturing fluid system was used for fracturing operations in sandstone reservoirs with low porosity and low permeability and a well temperature of 150°C.

[0041] Modified guar gum thickener 0.35% and water 99.52% are formulated into fracturing fluid base fluid. Modified guar gum thickener is carboxymethyl modified guar gum after special surface treatment. The appearance is light yellow powder. It is a first-class product specified in the industry standard "SY / T5764-2007 General Technical Requirements for Vegetable Glue for Fracturing".

[0042] After it is fully swollen for 12 minutes, add in sequence:

[0043] The high-efficiency drainage aid is 0.2%. The high-efficiency drainage aid is a compound of perfluorooctyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, methanol or ethanol. 0.2% addition (mass ratio), at 30°C, surface tension ≤ 25.0mN / m, interfacial tension ≤ 2.0mN / m.

[0044] High-efficiency clay stabilizer 0.2%, hig...

example 3

[0048] The concentrated guar gum fracturing fluid system was used for fracturing operations in sandstone reservoirs with low porosity and low permeability and a well temperature of 160°C.

[0049] 0.45% modified guar gum thickener and 99.5% water are configured as fracturing fluid base fluid. The modified guar gum thickener is carboxymethyl modified guar gum after special surface treatment. The appearance is light yellow powder, which belongs to The first-class product stipulated in the industry standard "SY / T5764-2007 General Technical Requirements for Vegetable Glue for Fracturing".

[0050] After it is fully swollen for 12 minutes, add in sequence:

[0051] The high-efficiency drainage aid is 0.2%. The high-efficiency drainage aid is a compound of perfluorooctyl carboxylic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether, methanol or ethanol. 0.2% addition (mass ratio), at 30°C, surface tension ≤ 25.0mN / m, interfacial tension ≤ 2.0mN / m.

[0052] High-efficien...

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Abstract

The invention discloses a guanidine gum fracturing fluid system. The system comprises a base solution and a cross-linking agent, wherein the weight ratio between the cross-linking agent and the base solution is 0.3-0.8%, the base solution comprises 0.2-0.45% of modified guanidine gum thickening agents, 0.15-0.2% of efficient discharge aiding agents, 0.2-0.5% of efficient clay stabilizers, 0.05-0.1% of bactericides, 0.05-0.15% of efficient gel breakers, and the balance water, and the sum of the weight percentages of all the constituents is 100%. By the adoption of the system, usage mount of guanidine gum is reduced, and therefore residue rate is small, reservoir damage is light, and reservoir protection is facilitated.

Description

technical field [0001] The present application relates to the technical field of petroleum exploitation, in particular to a guar gum fracturing fluid system. Background technique [0002] At present, my country's oilfields have basically entered the middle and late stages of production, the comprehensive water cut has increased, and the permeability of oil layers has decreased. Fracturing and fracture creation of oil wells to form artificial seepage channels is the most feasible way to improve oil well permeability, increase oil recovery efficiency, and increase production. means. [0003] At present, the traditional guar gum fracturing fluid system used in water-based fracturing in China has strong temperature resistance and shear resistance, which is good for carrying sand and creating fractures, but the guar gum is used in a large amount, and the gel is not completely broken after fracturing, resulting in the failure of the fracturing fluid. High residue content can easil...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/685C09K8/90C09K2208/26
Inventor 郝志伟宋有胜王宇宾徐鸿志赵文娜刘婧丹王雪莹叶松滨
Owner BC P INC CHINA NAT PETROLEUM CORP
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