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Preparation method for multi-element polymerized gel

A polymer gel, multi-component technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polyacrylamide degradation and damage, poor adhesion of the pipe wall, low colloidal strength, etc., and achieve low viscosity of the base fluid. , Low cost, strong resistance to pressure difference

Inactive Publication Date: 2013-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylamide gels have the disadvantages of low colloidal strength and poor adhesion to the tube wall. More importantly, metal ions have a serious degradation and damage effect on polyacrylamide, thus limiting its application in certain fields.
[0005] Chinese patent notification number CN101135237B provides a technology and process for downhole jelly valves. It is a gel composed of guar gum, caustic soda, formaldehyde, borax and hydrogen peroxide. Its process is simple and the construction period is short. Poor adhesion, low pressure bearing capacity and other disadvantages

Method used

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  • Preparation method for multi-element polymerized gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Synthesis of graft copolymer: Dissolve 1.5% sodium carboxymethylcellulose in deionized water, after fully swelling, add 10% acrylamide, 3% 2-acrylamido-2-methylpropanesulfonic acid, 1.8 % acrylic acid (dissolve 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in 0.5% sodium hydroxide solution first, then add the above solution after cooling), 7% acryloyloxyethyl trimethyl chloride ammonium, the temperature was raised to 45°C, and then the initiator was added, and the reaction was stirred for 8 hours to obtain the product.

[0033] The configuration of the base liquid: cut the synthesized graft copolymer into small particles, configure it into a 2% solution, and stir until it is completely dissolved.

[0034] Formation of multi-component polymeric gel: add 0.02% chromium potassium sulfate, 0.02% ammonium persulfate and 0.01% sodium bisulfite to the base fluid, place it in a simulated wellbore at 80°C, and the viscosity after gelation is 97105mPa· s, the modulu...

Embodiment 2

[0036] Synthesis of graft copolymer: Dissolve 5% sodium carboxymethylcellulose in deionized water, after fully swelling, add 20% acrylamide, 8% 2-acrylamido-2-methylpropanesulfonic acid, 6 % acrylic acid (dissolve 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in 0.5% sodium hydroxide solution first, then add the above solution after cooling), 20% acryloyloxyethyl trimethyl chloride ammonium, the temperature was raised to 45°C, and then the initiator was added, and the reaction was stirred for 8 hours to obtain the product.

[0037] Configuration of base liquid: cut the synthesized graft copolymer into small particles, configure it into a 1.5% solution, and stir until completely dissolved.

[0038] Formation of multi-component polymer gel: add 0.02% potassium chromium sulfate and 0.025% ammonium persulfate to the base fluid, place it in a simulated wellbore at 60°C, the viscosity after gelation is 77600mPa·s, and the elastic modulus is 3590Pa , the pressure bearin...

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Abstract

The invention relates to a preparation method for a multi-element polymerized gel. The preparation method comprises the following steps: preparing a graft copolymer from raw materials consisting of 1 to 5% of carboxymethylcellulose sodium, 10 to 20% of acrylamide, 3 to 8% of 2-acrylamido-2-methylpropanesulfonate, 10 to 20% of acryloyloxyethyl trimethyl ammonium chloride and 0.5 to 6% of acrylic acid in an aqueous medium in an environment with a temperature of 40 DEG C and filled with nitrogen with stirring after initiating by an initiator; dissolving the graft copolymer in water to prepare base fluid with a concentration of 1.5 to 2%; and adding a cross-linking agent and a gel breaking system to form the multi-element polymerized gel with controllable gel breaking. The multi-element polymerized gel prepared by using the preparation method has the advantages of low cost, low base fluid viscosity, convenience in pumping, great viscosity and strong differential pressure resistance after gelling, etc.

Description

technical field [0001] The invention relates to a preparation method of multi-component polymer gel, and the invention relates to the fields of polymer multi-component graft copolymerization and engineering technology. Background technique [0002] At present, in the process of drilling, completion and workover of oil and gas wells, in order to ensure construction safety, mud or well killing fluid and matching well killing devices are usually used to kill wells. However, this kind of conventional well killing will inevitably cause damage to the reservoir. Some wells have no production for a long time after the operation is completed, and even become completely abandoned wells, and the construction costs are expensive, the construction period is long, and the operation is complicated. [0003] In order to change this situation, snubbing operations can be used instead of killing hydraulic wells, that is, wellbore pressure is controlled through wellhead equipment, which can not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/56C08F220/34C08F220/58C08J3/075C09K8/40
Inventor 刘德基尹玉川王丙坤孙忠杰李晓辉石峰吴迪祝洪爽邓生辉马玉花姚普勇
Owner PETROCHINA CO LTD
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