Acrylamide polymer-oil base compounded system and application thereof as cement paste supporting liquid

A technology of acrylamide and polymer, which is applied in the field of cement slurry bearing liquid, acrylamide polymer and oil-based compound system, which can solve the problems of cement slurry that cannot reach the support plugging, leakage of large cracks, and plugging failure And other problems, to meet the site construction requirements, strong anti-dilution, good compatibility

Inactive Publication Date: 2017-01-25
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during on-site construction, the high-viscosity supporting fluid is mainly composed of high-concentration bentonite slurry or dripping drilling fluid. These two supporting fluids are easily diluted by formation water, and cannot reach the supporting plugging cement slurry. The role of the cement slurry will cause the cave to be extended, and the large crack will be lost, resulting in the failure of plugging

Method used

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  • Acrylamide polymer-oil base compounded system and application thereof as cement paste supporting liquid
  • Acrylamide polymer-oil base compounded system and application thereof as cement paste supporting liquid
  • Acrylamide polymer-oil base compounded system and application thereof as cement paste supporting liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 8g of acrylamide, 3g of 2-acrylamide-2-methylpropanesulfonic acid and 5g of acrylic acid in 50mL of water, add dropwise 1wt% sodium hydroxide solution to adjust the pH of the solution to 9, to obtain aqueous solution I; Dissolve in 20ml of water to form aqueous solution II; add 100mL of white oil to the four-necked flask, and add solution I to the four-necked flask, add 3g of SP-80 under stirring conditions and fill with nitrogen to exhaust oxygen; heat the mixed solution in a water bath to After 80°C, slowly drop solution II into the four-necked flask, continue to blow nitrogen and stir for 4 hours, then stop the reaction, cool the solution to room temperature, and the obtained white viscous liquid is the compound system of acrylamide polymer and oil base .

[0028] The apparent viscosity of the compound system of acrylamide polymer and oil base is 112mPa.s, which meets the pumping requirements of on-site construction and has good rheological properties.

Embodiment 2

[0030] 10g of acrylamide, 5g of 2-acrylamide-2-methylpropanesulfonic acid and 8g of acrylic acid were dissolved in 80mL of water, and 1.5wt% sodium hydroxide solution was added dropwise to adjust the pH of the solution to 9 to obtain aqueous solution I; Dissolve potassium sulfate in 20g water to form aqueous solution II; add 110mL white oil to the four-necked flask, and add solution I to the four-necked flask, add 3g SP-80 under stirring conditions and fill with nitrogen to exhaust oxygen; heat the mixed solution in a water bath After reaching 90°C, slowly drop solution II into the four-neck flask, continue to blow nitrogen and stir for 4 hours, then stop the reaction, cool the solution to room temperature, and the obtained white viscous liquid is a compound of acrylamide polymer and oil base system.

[0031] The apparent viscosity of the compound system of acrylamide polymer and oil base is 105mPa.s, which meets the pumping requirements of on-site construction and has good rh...

Embodiment 3

[0033] 9g of acrylamide, 4g of 2-acrylamide-2-methylpropanesulfonic acid and 6g of acrylic acid were dissolved in 80mL of water, and 1wt% sodium hydroxide solution was added dropwise to adjust the pH of the solution to 8 to obtain aqueous solution I; 0.5g of persulfuric acid Potassium was dissolved in 20g of water to form aqueous solution II; 100mL of white oil was added to the four-necked flask, and solution I was added to the four-necked flask, and 3g of SP-80 was added under agitation and nitrogen exhausted; the mixed solution was heated in a water bath to After 90°C, slowly drop solution II into the four-necked flask, continue to blow nitrogen and stir for 3.5 hours, then stop the reaction, cool the solution to room temperature, and the obtained white viscous liquid is a compound of acrylamide polymer and oil base system.

[0034] The apparent viscosity of the compound system of acrylamide polymer and oil base is 110mPa.s, which meets the pumping requirements of on-site co...

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Abstract

The invention discloses an acrylamide polymer-oil base compounded system. The compounded system is formed by compounding an acrylamide polymer with the molecular weight of 4.0*10<6>-1.0*10<7> and an oil base liquid, wherein the acrylamide polymer realizes the polymerization of the acrylamide polymer and the compounding of the acrylamide polymer and the oil base liquid through adopting inverse emulsion polymerization of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid; the system is used as the cement paste supporting liquid which thickens in the presence of water, and the thickening has controllability and a very strong anti-dilution property; and under the condition of 150 DEG C, 72h aging continues for, the apparent viscosity does not fall dramatically, and an excellent heat-resisting property is achieved. In addition, the supporting liquid and the cement paste have excellent compatibility and avoid the flash set phenomenon of the cement paste after being mixed sufficiently, the normal-temperature flowing property and high-temperature flowing property of the mixed thick liquid are both suitable for pumping to meet the on-site operation requirement.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cement slurry plugging engineering operations, in particular to an acrylamide polymer and oil-based compound system and its use as a cement slurry support fluid. Background technique [0002] The leakage phenomenon during the drilling of oil and gas wells, especially the return loss caused by large dissolved caves and large fractures, seriously affects the drilling efficiency. For lost-return leaks caused by large karst caves and large cracks, cement slurry is generally used for plugging. Before the cement slurry is injected into the cave, it is necessary to inject a high-viscosity support fluid downhole to play a supporting role. The support fluid mainly bears the liquid column pressure from the cement slurry and drilling fluid to ensure that the cement slurry stays and coagulates at the opening of the cave. hole, so as to achieve the purpose of plugging. [0003] However, during on-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 程智仇盛南郝惠军贾东民赵福祥左凤江张洪伟郭明红曹靖瑜徐兴军巩建军
Owner CNPC BOHAI DRILLING ENG
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