High-temperature-resistant gelling agent in acid liquid and method for preparing high-temperature-resistant gelling agent

A gelling agent and high temperature resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost and poor high temperature resistance, and achieve the effects of stable performance, convenient construction and simple preparation

Inactive Publication Date: 2016-10-26
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a high temperature resistant acid liquid gelling agent and its preparation method to solve the problems of poor high temperature resistance and high cost of the acid liquid system used in reservoir acid fracturing in the prior art

Method used

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  • High-temperature-resistant gelling agent in acid liquid and method for preparing high-temperature-resistant gelling agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Prepare reaction mother liquor: dissolve 66g of acrylamide monomer, 75g of acryloyloxyethyltrimethylammonium chloride monomer (80% aqueous solution), 2g of acrylic acid into 300g of deionized water, stir evenly, and then add Na 2 CO 3 Adjust the pH value of the solution to a pH value of 11, stir evenly to obtain a reaction mother liquor, and place the mother liquor into a polymerization device;

[0025] (2) When the temperature of the mother liquor is 8°C, feed high-purity N into the mother liquor 2 ;

[0026] (3) Polymerization reaction: add 0.11g azobisisobutylimidazoline hydrochloride, 0.03g sodium formate, 0.06g potassium persulfate, 0.06g sodium bisulfite, 0.03g three Pentasodium ethylene tetraamine pentaacetate, react fully for 1 hour, then keep warm for 3 hours;

[0027] (4) The polymer obtained after the polymerization reaction in step (3) was taken out and granulated, dried at 60° C. for 5 hours, and pulverized to make a gelling agent.

Embodiment 2

[0029] (1) Prepare reaction mother liquor: dissolve 50g of acrylamide monomer, 56.7g of acryloyloxyethyltrimethylammonium chloride monomer (80% aqueous solution), 5g of itaconic acid into 186.5g of deionized water, and stir Uniformly, then add Na 2 CO 3 Adjust the pH value of the solution to a pH value of 12, stir evenly to obtain a reaction mother liquor, and place the mother liquor into a polymerization device;

[0030] (2) When the temperature of the mother liquor is 8°C, feed high-purity N into the mother liquor 2 ;

[0031] (3) Polymerization reaction: Add 0.07g azobisisobutyronitrile, 0.03g sodium formate, 0.07g potassium persulfate, 0.07g sodium bisulfite, 0.01g ethylenediammonium tetraacetic acid to the mother liquor in step (2) successively , fully reacted for 1 hour, and then kept warm for 3 hours;

[0032] (4) The polymer obtained after the polymerization reaction in step (3) was taken out and granulated, dried at 60° C. for 5 hours, and pulverized to make a gel...

Embodiment 3

[0034] (1) Preparation of reaction mother liquor: dissolve 38.5g of acrylamide monomer, 43.7g of acryloyloxyethyltrimethylammonium chloride monomer (80% aqueous solution), and 10g of acrylic acid into 155g of deionized water, and stir evenly. Then add Na 2 CO 3 Adjust the pH value of the solution to a pH value of 12, stir evenly to obtain a reaction mother liquor, and place the mother liquor into a polymerization device;

[0035] (2) When the temperature of the mother liquor is 8°C, feed high-purity N into the mother liquor 2 ;

[0036] (3) Polymerization reaction: add 0.06g azobisisobutylimidazoline hydrochloride, 0.02g sodium formate, 0.04g potassium persulfate, 0.04g sodium bisulfite, 0.01g ethyl alcohol successively in the mother liquor in step (2) Diammonium tetraacetic acid, fully reacted for 1 hour, then kept warm for 3 hours;

[0037] (4) The polymer obtained after the polymerization reaction in step (3) was taken out and granulated, dried at 60° C. for 5 hours, an...

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Abstract

The invention discloses a high-temperature-resistant gelling agent in acid liquid and a method for preparing the high-temperature-resistant gelling agent. Acrylamide monomers, acryloyloxyethyl trimethyl ammonium chloride monomers and third monomers are polymerized to obtain the high-temperature-resistant gelling agent. The method includes adding azo initiators, chain transfer agents, oxidation and reduction initiators and iron ion complexing agents during polymerization reaction to obtain reaction products; granulating and drying the reaction products to obtain the high-temperature-resistant gelling agent. The high-temperature-resistant gelling agent in the acid liquid and the method have the advantages that the high-temperature-resistant gelling agent is easy to synthesize, gelling acid liquid systems are stable in performance, easy to prepare and convenient to construct, can be applied to high-temperature carbonate rock acidizing construction, are high-temperature-resistant and salt-resistant and are excellent in retardance, filtration reduction, fracture forming and resistance decrease performance, secondary damage can be alleviated, the flow guide capacity of acid erosion fracture can be effectively improved, penetration distances of acid can be effectively extended, and the deep acidizing purpose can be achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield reservoir transformation, in particular to a high-temperature-resistant acid liquid gelling agent and a preparation method thereof. Background technique [0002] With oilfield exploration and development gradually turning to ultra-high temperature reservoirs, the operating temperature of the commonly used gelled acid systems is less than 150 °C, which is difficult to meet the needs of on-site reservoir acid fracturing. The average temperature of most wells in PetroChina Tarim and Sinopec Northwest Bureau is between 160-180°C, a few wells reach 190°C, and the temperature of buried hill reservoirs in the central Huabei Oilfield even reaches 201°C (Niudong 1 ), the well temperature of buried hill reservoirs in Jidong Oilfield is also around 160-180°C. At present, the main difficulty in the acid fracturing of ultra-high temperature wells is that the well temperature is ultra-high, and the performance...

Claims

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Application Information

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IPC IPC(8): C09K8/72C09K8/035C08F220/34C08F220/56C08F220/06C08F222/02
CPCC09K8/725C08F220/34C08F220/56C09K8/035C08F220/06C08F222/02
Inventor 贾红战崔福员杨彬李军李文杰张立军王云云曹骕骕徐杏娟谷庆江
Owner CNPC BOHAI DRILLING ENG
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