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Polymer thickener for high-temperature-resistant water-based fracturing fluid and production method for polymer thickener

A technology for water-based fracturing, polymers, compositions for drilling, chemical instruments and methods, etc.

Inactive Publication Date: 2016-03-30
DOWNHOLE OPERATION CO OF CNPC WESTERN DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of the prior art, the present invention provides a polymer thickener for high temperature resistant water-based fracturing fluid and its production method

Method used

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  • Polymer thickener for high-temperature-resistant water-based fracturing fluid and production method for polymer thickener
  • Polymer thickener for high-temperature-resistant water-based fracturing fluid and production method for polymer thickener
  • Polymer thickener for high-temperature-resistant water-based fracturing fluid and production method for polymer thickener

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Experimental program
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Embodiment 1

[0025] The weight percent of each monomer and water: AM:AA:PSNN:APEG:DMDAAC:MBA=450:250:80:0.4:18:0.02.

[0026] Solution preparation: Add 201.58g of distilled water into a 2000ml beaker, add 450g of AM monomer, 250g of AA monomer, add 80g of PSNN monomer, add 0.4g of APEG monomer, add 18g of DMDAAC monomer, add 0.02g of MBA monomer, Stir to dissolve for 30 minutes, and slowly add 40% NaOH solution under stirring condition to adjust the pH to 6-7. Continue to stir the solution for 20 min under the condition of feeding nitrogen gas at a certain flow rate to remove dissolved oxygen in water.

[0027] Polymerization of the solution: heating the solution to 40°C; adding 0.8% of thermal decomposition type and redox initiators accounting for the total mass of monomers at a certain speed; keeping the temperature at 40°C for 24 hours and then cooling down to room temperature. To obtain, the colloid is granulated, dried and pulverized to obtain a fracturing fluid thickener, which is r...

Embodiment 2

[0030] The weight percent of each monomer and water: AM:AA:PSNN:APEG:DMDAAC:MBA=450:150:80:0.5:20:0.04.

[0031] Solution preparation: Add 299.46g of distilled water into a 2000ml beaker, add 450g of AM monomer, 150g of AA monomer, add 80g of PSNN monomer, add 0.5g of APEG monomer, add 2g of DMDAAC monomer, add 0.04g of MBA monomer, Stir to dissolve for 30 minutes, and slowly add 40% NaOH solution under stirring condition to adjust the pH to 6-7. Continue to stir the solution for 20 min under the condition of feeding nitrogen gas at a certain flow rate to remove dissolved oxygen in water.

[0032] Polymerization of the solution: heating the solution to 40°C; adding 0.8% of thermal decomposition type and redox initiators accounting for the total mass of monomers at a certain speed; keeping the temperature at 40°C for 24 hours and then cooling down to room temperature. To obtain, the colloid is granulated, dried and pulverized to obtain a fracturing fluid thickener, which is re...

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Abstract

The present invention relates to a polymer thickener for a high-temperature-resistant water-based fracturing fluid and a production method for the polymer thickener. The thickener for the water-based fracturing fluid is a low molecular polymer which is good in temperature resistance, shear resistance and sand carrying performance in a hyperbranched structure and is used for a production-increasing fracturing operation in an oil field. The thickener is copolymerized by six monomers: acrylamide (AM), acrylic acid (AA), dimethyl diallyl ammonium chloride (DMDAAC), N,N'-methylenebisacrylamide (MBA), sodium p-styrenesulfonate (PSNN) and allyl polyoxyethylene ether (APEG). A production method for the thickener uses a thermal decomposition-type and redox-type initiator, so that the monomers are polymerized. The thickener provided by the present invention has the advantages of small amount of residues, low usage viscosity, good proppant carrying capacity, low cost and easy flow back and the like.

Description

technical field [0001] The invention relates to the technical fields of oil field chemistry and fracturing stimulation, in particular to a polymer thickener for high temperature resistant water-based fracturing fluid and a production method thereof. The fracturing fluid thickener is suitable for storage at 180-200°C Layer fracturing construction. Background technique [0002] Oil layer hydraulic fracturing is one of the commonly used methods to improve the seepage capacity and mode of crude oil in the formation. Reservoir hydraulic fracturing (also referred to as reservoir fracturing or fracturing), which uses surface high-pressure pumps to inject high-viscosity liquid into the well at a displacement that greatly exceeds the absorption capacity of the formation, forming high pressure near the bottom of the well. When the pressure exceeds the formation stress near the bottom of the well and the tensile strength of the rock, fractures symmetrical to the wellbore will be forme...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F283/06C08F220/56C08F220/06C08F212/14C08F226/02
CPCC09K8/68C08F283/065C09K8/685C09K8/882C09K8/887C08F220/56
Inventor 陈效领李帅帅苏盈豪胡儒丽
Owner DOWNHOLE OPERATION CO OF CNPC WESTERN DRILLING ENG CO LTD
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