Filtration-reducing agent for synthetic polymer oil-well cement

A technology for synthesizing polymers and oil well cement, which is applied in the field of polymers, and can solve the problems of sudden drop in polymer molecular weight, lack of hydrolytic stability, cement settlement and loss of water loss performance, etc.

Inactive Publication Date: 2011-07-20
JIANGSU AOLUNDA HIGH TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cross-linking agents do not have hydrolytic stability under high temperature and high alkalinity conditions, resulting in a sudden drop in polymer molecular weight under high temperature and high alkalinity conditions, resulting in cement sedimentation and a decrease in water loss performance

Method used

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  • Filtration-reducing agent for synthetic polymer oil-well cement
  • Filtration-reducing agent for synthetic polymer oil-well cement
  • Filtration-reducing agent for synthetic polymer oil-well cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1 Acrylamide / 2-acrylamide-2-methylpropanesulfonate / 3-allyloxy-2-hydroxyl-propanesulfonate / acrylic acid / N, N'-dimethylacrylamide (mol %: 22 / 27 / 16 / 13 / 22) Synthesis of Pentapolymer

[0073] Add 7.5g acrylamide, 59.4g sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 10.5g N,N'-dimethylacrylamide, 4.5g acrylic acid, 0.2 g of N, N-methylenebisacrylamide and 30 g of water were stirred evenly as a crosslinking agent, and then put into a dropping funnel for later use.

[0074] 1.9g acrylamide, 14.8g sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 52.3g sodium 3-allyloxy-2-hydroxyl-propanesulfonate (40% content) ), 1.1g of acrylic acid, 2.7g of N, N'-dimethylacrylamide and 80g of water were added to a flask with a heater and a stirring device, heated to 65°C under nitrogen protection, and then stirred for 180 minutes Evenly add the standby monomer mixture in the above dropping funnel dropwise, while adding dropwise, add 4.0g of 10wt% sodium persul...

Embodiment 2

[0075] Example 2 Acrylamide / 2-acrylamide-2-methylpropanesulfonate / 3-allyloxy-2-hydroxyl-propanesulfonate / acrylic acid / N-isopropylacrylamide (mol%: 25 / 25 / 14 / 15 / 21) Synthesis of Pentapolymers

[0076] Add 8.6g of acrylamide, 55.0g of sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 5.2g of acrylic acid, 11.4g of N-isopropylacrylamide and 30g of water into a beaker and stir well Finally, put it into the dropping funnel and set aside.

[0077] 2.1g acrylamide, 13.7g sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 45.8g sodium 3-allyloxy-2-hydroxyl-propanesulfonate (40% content ), 1.3g acrylic acid and 2.8g N-isopropylacrylamide, crosslinking agent 0.4g diallyl polyethylene glycol ether (molecular weight 500), and 60g water join in a flask with heater and stirring device , heated to 65°C under the protection of nitrogen, and then evenly added the spare monomer mixture in the dropping funnel dropwise within 180 minutes under stirring, while adding dropwise,...

Embodiment 3

[0078] Example 3 Acrylamide / 2-acrylamide-2-methylpropanesulfonate / 3-allyloxy-2-hydroxyl-propanesulfonate / acrylic acid / N, N-diisopropylacrylamide (mol %: 30 / 26 / 12 / 17 / 15) Synthesis of Pentapolymer

[0079] Add 10.2g acrylamide, 57.1g sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 5.8g acrylic acid, 11.2g N,N-diisopropylacrylamide, Mix 1.0g sodium lauryl sulfate and 30g water evenly, put it into the dropping funnel, and set aside.

[0080] 2.6g acrylamide, 14.3g sodium 2-acrylamide-2-methylpropanesulfonate (50% content), 39.2g sodium 3-allyloxy-2-hydroxyl-propanesulfonate (40% content ), 1.5g acrylic acid, 2.8gN, N-diisopropylacrylamide, cross-linking agent pentaerythritol tetraallyl ether 0.8g (pentaerythritol tetraallyl ether, pentaerythritol triallyl ether and pentaerythritol diallyl ether mixture), 2.0g SDS and 80g water were added to a flask with a heater and a stirring device, heated to 65°C under nitrogen protection, and then evenly added dropwise to the spa...

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Abstract

The invention discloses a filtration-reducing agent for synthetic polymer oil-well cement. The filtration-reducing agent is prepared by copolymerizing an acrylamide monomer, a cross-linking agent and other monomers. The polymer has high stability under the conditions of high temperature, high pressure and strong basicity, can effectively enhance the filtration reducing performance of a well cementation cement slurry system in the environments of high temperature, high pressure and high salinity, solves the sedimentation problem of cement to the greatest extent, greatly solves the delayed coagulation problem, and is particularly suitable for cement well cementation of an oil well with super depth, ultrahigh temperature and ultrahigh pressure. The polymer can stabilize a well cementation cement slurry system, avoids free fluid in cement slurry and increases the cement intensity. Under a general condition (80 DEG C), the required dosage of the polymer is only 0.5 percent BOWC. Under the conditions of high temperature, high pressure and high salinity, the required dosage of the polymer is only 1.0 percent BOWC, so that the aim of reducing filtration of well cementation cement can be fulfilled, and the economic effect is very remarkable.

Description

technical field [0001] The invention relates to a polymer polymerized by various monomers, in particular to a synthetic polymer used for oil well cementing, which is copolymerized by acrylamide monomers, cross-linking agents and other monomers. The polymer of the present invention not only has strong stability under high temperature, high pressure and strong alkali conditions, but also can effectively improve the water loss reduction performance of the cement slurry system under high temperature, high pressure and high salt environment, greatly improving the It is especially suitable for cementing of ultra-deep, ultra-high temperature and ultra-high pressure oil wells. Background technique [0002] With the continuous reduction of easy-to-exploit oil reserves, oil exploration has developed into medium-deep wells, deep wells and ultra-deep wells in oceans and complex formations. The completion process of an oil well is a whole process from the drilling of the oil-producing l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C08F220/58C08F220/56
Inventor 吴本璋陈律毛锋钮强
Owner JIANGSU AOLUNDA HIGH TECH IND
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