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High temperature gelatinizing agent used in acidizing and fracturing and synthetic method thereof

A technology of acid fracturing and high-temperature glue, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., which can solve the problems of slowing speed and achieve low residue and wide application range

Inactive Publication Date: 2014-03-19
北京希涛技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, ordinary cationic homopolymers are generally used as a new type of acid thickener, which can meet general operations. The characteristic of general products is that as the temperature of the formation increases, the viscosity of the acid gradually decreases, even at higher temperatures. Under the condition of 150℃, there is almost no viscosity, and it cannot play a good retarding effect.

Method used

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  • High temperature gelatinizing agent used in acidizing and fracturing and synthetic method thereof
  • High temperature gelatinizing agent used in acidizing and fracturing and synthetic method thereof
  • High temperature gelatinizing agent used in acidizing and fracturing and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the weight percent of each monomer and water is: DMC: DADMAC: AMPS: PVN: H 2 O=30:20:5:5:40.

[0041] Preparation of the solution: add 400g of distilled water in a 2000ml beaker, add 300g of DMC monomer, 200g of DADMAC monomer, add 50g of AMPS monomer, add 50g of PVN monomer, stir and dissolve for 30 minutes, slowly add neutralizer ( sodium hydroxide) to pH 4.5. The stirring solution was continued to ripen for 30 minutes.

[0042] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0043] Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalysts AZDN1g / L, V650.5g / L, V500.1g / L, ammonium persulfate 0.08g / L, sodium formaldehyde sulfoxylate in sequence under nitrogen protection 0.08g / L, stop blowing nitrogen and seal the polymerization tank, ind...

Embodiment 2

[0046] In this example, the weight percent of each monomer and water is: DMC: DADMAC: AMPS: PVN: H 2 O=30:20:8:10:32.

[0047] Preparation of the solution: add 320g of distilled water in a 2000ml beaker, add 300g of DMC monomer, 200g of DADMAC monomer, add 80g of AMPS monomer, add 100g of PVN monomer, stir and dissolve for 30 minutes, slowly add neutralizer ( sodium hydroxide) to pH 4.5. The stirring solution was continued to ripen for 30 minutes.

[0048] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0049]Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalysts AZDN 1g / L, V650.5g / L, V500.1g / L, ammonium persulfate 0.1g / L, sodium formaldehyde sulfoxylate in sequence under nitrogen protection 0.1g / L, stop blowing nitrogen and seal the polymerization tank, ind...

Embodiment 3

[0052] In this example, the weight percent of each monomer and water is: DMC: DADMAC: AMPS: PVN: H 2 O=20:10:5:5:60.

[0053] Preparation of the solution: add 600g of distilled water in a 2000ml beaker, add 200g of DMC monomer, 100g of DADMAC monomer, add 50g of AMPS monomer, add 50g of PVN monomer, stir and dissolve for 30 minutes, slowly add neutralizer ( sodium hydroxide) to pH 4.5. The stirring solution was continued to ripen for 30 minutes.

[0054] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0055] Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalysts AZDN1g / L, V650.5g / L, V500.2g / L, ammonium persulfate 0.1g / L, sodium formaldehyde sulfoxylate in sequence under nitrogen protection 0.1g / L, stop blowing nitrogen and seal the polymerization tank, induc...

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Abstract

The invention discloses a high temperature gelatinizing agent used in acidizing and fracturing. The gelatinizing agent is prepared by copolymerizing four monomers including methacryloyloxyethyl trimethyl ammonium chloride amide (DMC), dimethyl diallyl ammonium chloride (DADMAC), 2-acrylamide-2-methylpropane sulfonate (AMPS) and N-vinyl-2-pyrrolidone (PVN). The invention also discloses a preparation method of the gelatinizing agent used in acidizing and fracturing. Compared with the prior art, the gelatinizing agent disclosed by the invention has the characteristics of low residue content, wide range of application, resistance to high temperature of 150 DEG C, resistance to shear and easiness in dissolution in acid, can meet the acidizing and fracturing construction of carbonate formations at a temperature above 150 DEG C, and has the characteristics of good tackifying performance, good temperature resistance, no residues, low cost, easiness in flowback and the like.

Description

technical field [0001] The invention relates to a high-temperature gelling agent in acid fracturing, specifically, the invention relates to a polymer gelling agent used in acid fracturing to increase the viscosity of acid liquid while controlling the slow release of acid liquid and the gelling agent Synthetic method of the agent. Background technique [0002] Acidizing and acid fracturing are one of the main measures for increasing production of oil and gas wells and increasing injection of water injection wells. Sandstone matrix acidizing and carbonate matrix acidizing both inject acid liquid into the formation under the condition of lower than the fracture pressure of the reservoir, dissolve the soluble substances in the formation, remove the clogging substances in the voids or fractures, and thus increase the production of oil and gas wells Or a technological measure for increasing injection of water injection wells. Its main purpose is to unplug, restore and increase o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C08F220/36C08F226/02C08F220/58C08F226/10
CPCC08F220/36C09K8/725C09K8/74C08F226/02C08F220/585C08F226/10
Inventor 唐富刚郝春玲
Owner 北京希涛技术开发有限公司
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