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A low-damage, ultra-low-concentration guar gum fracturing fluid system, preparation method and application

A technology of fracturing fluid and guar gum, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of water-sensitive reservoirs such as large damage, large amount of residue, and large damage, and achieve the reduction of gel-breaking fluid The effect of surface and interfacial tension, reducing the amount of gel-breaking residue, and broad application prospects

Active Publication Date: 2019-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional fracturing fluid system still has the following problems: water-sensitive reservoir damage is greater; residue, unbroken concentrated gel and filter cake cause great damage; the reaction time and activity of the gel breaker are dependent on temperature High, the duration of gel breaking is short, and the oxidative gel breaking of the gel breaker is random, resulting in incomplete breakage of the guar gum glycosidic bond; the gel breaking reaction is a non-specific reaction, which can react with any object encountered, such as tubing, formation matrix and crude oil, etc.; at the same time, the concentration of guar gum in the conventional guar gum fracturing fluid system is relatively high. After entering the formation, hydroxypropyl guar gum will leave a large amount of residue in the fracture and fracture wall, causing damage to the reservoir, resulting in a decrease in the seepage capacity of the formation and a decrease in production capacity. decrease, which directly affects the fracturing effect
However, whether it is a conventional fracturing fluid system or a modified low-concentration guar gum fracturing fluid system, to a certain extent, there are still large amounts of guar gum, uncontrollable gel breaking time, and large residues after gel breaking (usually >350mg / L ) and other issues, which eventually lead to the substandard flowback rate after construction

Method used

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  • A low-damage, ultra-low-concentration guar gum fracturing fluid system, preparation method and application
  • A low-damage, ultra-low-concentration guar gum fracturing fluid system, preparation method and application
  • A low-damage, ultra-low-concentration guar gum fracturing fluid system, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0045] The guar gum fracturing fluid system is composed of base fluid, gel breaker and crosslinking agent. The base fluid is composed of the following components in mass percentage: thickener (hydroxypropyl guar gum) 0.3%, clay stabilizer (potassium chloride ) 1%, drainage aid (ZITHE-34 high-efficiency drainage aid) 0.2%, fungicide (1,2-benzisothiazolin-3-one) 0.1%, pH regulator (sodium carbonate) 0.2%, Foaming agent (YFP-1 foaming agent) 1%, the balance is water; crosslinking agent is SITAR-11 type super delayed crosslinking agent, the volume ratio of base liquid and crosslinking agent is 100:0.2; The gel agent is FANTA-05 low-temperature fracturing gel-breaking enzyme, and the amount of gel-breaking agent accounts for 0.005% of the mass of the base fluid.

[0046] The preparation steps of the guar gum fracturing fluid system are as follows:

[0047] 1) Preparation of base liquid

[0048] Accurately take each component according to the mass percentage, add thickener, clay s...

Embodiment 2

[0052] The guar gum fracturing fluid system is composed of base fluid, gel breaker and crosslinking agent. The base fluid is composed of the following components in mass percentage: thickener (guar gum) 0.22%, clay stabilizer (ammonium chloride) 0.2% , drainage aid (ZITHE-34 high-efficiency drainage aid) 1%, bactericide (1,2-benzisothiazolin-3-one) 0.01%, pH regulator (sodium bicarbonate) 0.2%, foaming Agent (YFP-1 type foaming agent) 0.2%, the balance is water; crosslinking agent is SITAR-11 type super delayed crosslinking agent, the volume ratio of base liquid and crosslinking agent is 100:0.4; gel breaker It is FANTA-06 medium-high temperature fracturing gel-breaking enzyme, and the amount of gel-breaking agent accounts for 0.0005% of the mass of the base fluid.

[0053] The preparation steps of the guar gum fracturing fluid system are as follows:

[0054] 1) Preparation of base liquid

[0055] Accurately take each component according to the mass percentage, add thickener...

Embodiment 3

[0059] The guar gum fracturing fluid system is composed of base fluid, gel breaker and crosslinking agent. The base fluid is composed of the following components in mass percentage: thickener (carboxymethyl hydroxypropyl guar gum) 0.26%, clay stabilizer ( Potassium chloride 0.3%, ammonium chloride 0.3%) 0.6%, drainage aid (ZITHE-34 efficient drainage aid) 0.1%, fungicide (1,2-benzisothiazolin-3-one 0.02%, Caspofungin 0.04%) 0.06%, pH regulator (sodium hydroxide) 0.01%, foaming agent (YFP-1 type foaming agent) 0.7%, surplus is water; Strong delayed cross-linking agent, the volume ratio of base fluid to cross-linking agent is 100:0.6; the breaker is ammonium persulfate, and the amount of breaker accounts for 0.1% of the mass of the base liquid. The preparation method is the same as in Example 1.

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Abstract

The invention discloses a low-damage and ultralow-concentration guar gum fracturing fluid system, a preparation method and an application of the guar gum fracturing fluid system and belongs to the technical field of reservoir reforming for oil-gas field development. In order to solve the problems that the existing conventional fracturing fluid systems hardly give attention to the lowering of concentration of a thickener, the prolonging of crosslinking time, the improving of gel strength and gelout capability and being environmentally friendly, a SITAR-11 powerful delayed crosslinker is selected, so that formed gel is endowed with a relatively high delayed crosslinking effect while heat resistance, shearing resistance and solid carrying capacity for the formed gel are guaranteed, and the concentration of the thickener is greatly lowered; and on one hand, the reduction of cost and the increase of economic benefit are facilitated, and on the other hand, the amount of gelout residues is reduced after the concentration of the thickener is lowered. Further, FANTA-05 and FANTA-06fracturing gelout enzymes, which are thorough in gelout and controllable in gelout time, and a ZITHE-34 efficient discharge aiding agent are added in a matched manner, so that the fracturing fluid system, which has a delayed crosslinking effect, is high in heat resistance and salt tolerance, excellent in solid carrying behavior, controllable in gelout time and thorough in gelout and is green, environmentally friendly and efficient, can be formed.

Description

technical field [0001] The invention relates to a low-damage, ultra-low-concentration guar gum fracturing fluid system, and also relates to a preparation method and application of the fracturing fluid system, belonging to the technical field of oil and gas field development and reservoir transformation. Background technique [0002] In the process of oil and gas field development, as the production target gradually shifts from conventional oil and gas reservoirs to unconventional low-porosity tight oil and gas reservoirs, the lower limit of the physical properties of the recoverable reserves is getting lower and lower. Important measures for increasing production and injection of oil and gas reservoirs and key technologies for economical and effective development. In the process of hydraulic fracturing construction, the fracturing effect mainly depends on the perfection of fracturing technology, that is, the knowledge and understanding of fractures and formation conditions, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K2208/24
Inventor 梁文龙何青杨同玉唐万举赵静李雷付娜陈现义王旭红王彩王雪韦李轩张宇
Owner CHINA PETROLEUM & CHEM CORP
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