Shear-resistant low-concentration guar gum zirconium gel fracturing fluid

A gel fracturing fluid, low-concentration technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of irreversible cross-linking process, high shear resistance, high temperature resistance, etc. , to achieve the effect of improving stability, good suspended sand performance and low concentration

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boron crosslinking agents mainly include borax, boric acid, and mixtures of boron and complexing agents, etc. Its main features are reversible crosslinking and high shear resistance, and its main disadvantage is that it is not resistant to high temperatures (generally, the operating temperature is less than 130°C)
Transition metal crosslinking agents mainly include organic zirconium crosslinking agents and organic titanium crosslinking agents, which are characterized by chemical crosslinking and high temperature resistance, and can be used as crosslinking agents for low-concentration guar gum fracturing fluids, but the main problem is Not resistant to high shear, irreversible cross-linking process

Method used

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  • Shear-resistant low-concentration guar gum zirconium gel fracturing fluid
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  • Shear-resistant low-concentration guar gum zirconium gel fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of organozirconium crosslinking agent tetrakis(triethanolamine) zirconate

[0043] Add 12g of tetra-n-propyl zirconate into a three-necked flask, start stirring, add 7.5g of triethanolamine and 7.5g of n-propanol, heat to 60°C, and react for 2 hours; during heating, a white solid is produced; after adding 1g of water, the solid dissolves, Then heated to 80°C and reacted for 4h to obtain a yellow liquid containing 12% zirconium.

Embodiment 2

[0044] Example 2 Preparation of water-based zirconium crosslinking agent (zirconium and complexing agent form a polynuclear hydroxyl bridge structure in water)

[0045] Take 10g of zirconium oxychloride and add it into a three-necked flask, add 40g of water at the same time, and stir to dissolve. Add 12g of lactic acid to 13g of ammonia water and mix evenly, then add the mixture dropwise into the flask, finally add 4g of glycerin, heat up to 60°C, and react for 2h to obtain a colorless liquid containing 3.57% zirconium.

Embodiment 3

[0046] Example 3 Preparation of fracturing fluid base fluid

[0047] Add 494g water in mixer, add 2.25g carboxymethyl hydroxypropyl guar gum under stirring, after dissolving 3min, add 2.5g clay stabilizer tetramethylammonium chloride, 1.5g microemulsion drainage aid successively ( ME-1), 0.1g sodium hydroxide, 0.05g fungicide formaldehyde, stir and dissolve for 2min, let stand for 1h, and prepare a fracturing fluid base fluid with a concentration of carboxymethylhydroxypropyl guar gum of 0.45%. The apparent viscosity of fracturing fluid base fluid is 70mPa s (170s -1 ), the pH value is 10.5.

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Abstract

The invention discloses a shear-resistant low-concentration guar gum zirconium gel fracturing fluid which comprises at least the following components by weight: 0.2-0.6% of carboxymethyl hydroxypropylguar gum, 0.1%-0.4% of a clay stabilizer, 0.2%-0.4% of a discharge aiding agent, 0.2%-0.4% of a crosslinking agent, 0.1%-0.3% of a rheology modifier, a pH adjuster with a dosage capable of keeping the pH of the fracturing fluid at 10 to 12, and balance of water. The rheology modifier is selected from urea and thiourea. The rheology modifier is added to control the cross-linking rate of the carboxymethyl hydroxypropyl guar gum and the organic zirconium crosslinking agent, and the stability of the zirconium gel fracturing fluid under high shear can be improved. The shear-resistant low-concentration guar gum zirconium gel fracturing fluid has low use concentration, can resist high shear, and has good suspended sand performance, and the use temperature is less than 170DEG C.

Description

technical field [0001] The invention relates to a shear-resistant low-concentration guar gum zirconium jelly fracturing fluid, which can be used as a working fluid for hydraulic fracturing stimulation measures in oil field development. Background technique [0002] Hydraulic fracturing is to use the surface high-pressure pump group to pump high-viscosity liquid (fracturing fluid) into the well with a displacement exceeding the absorption capacity of the formation, and to suppress high pressure at the bottom of the well. After tensile strength, fractures are generated at the bottom of the well. Continue to inject the fracturing fluid with proppant, the fracture continues to extend, and the proppant is filled in the fracture. After the pump is stopped, due to the supporting effect of the proppant on the fracture, a long enough sand-filled fracture with a certain conductivity can be formed in the formation. The hydraulic fracturing stimulation technology of oil and gas wells ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90E21B43/16
CPCC09K8/685C09K8/905E21B43/16
Inventor 陈凯宋李煜肖春金陈磊刘霜陈培胜王丹郁登郎张子麟
Owner CHINA PETROLEUM & CHEM CORP
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