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Polymer/intercalation montmorillonite composite fluid loss reducer and its preparation method and application

A fluid loss reducer and polymer technology, applied in the field of oil and gas well cementing, can solve the problems of inability to resist calcium and magnesium ions, inability to carry out construction, thickening of cement slurry, etc., and achieve strong resistance to calcium and magnesium ion pollution and easy control. , The effect of strong water loss performance

Active Publication Date: 2019-10-25
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer cement fluid loss reducers are mostly prepared by solution polymerization, and most of the prepared fluid loss reducers cannot resist the interference of calcium and magnesium ions
If the well cementing construction is carried out on the offshore drilling platform, the cement slurry prepared with sea water will cause the cement slurry to thicken and cannot be used for construction

Method used

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  • Polymer/intercalation montmorillonite composite fluid loss reducer and its preparation method and application
  • Polymer/intercalation montmorillonite composite fluid loss reducer and its preparation method and application
  • Polymer/intercalation montmorillonite composite fluid loss reducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Put 4.5g of montmorillonite, 0.2g of octadecyltrimethylammonium bromide and 78g of distilled water into a 250mL four-necked flask, mix and stir for 12 hours, add 3.2g of sodium hydroxide, 0.3g of tributyl phosphate, and 0.02g Sodium methacrylic acid sulfonate, 0.01g ethylenediaminetetraacetic acid, 16.4g 2-acrylamido-2-methylpropanesulfonic acid, 1.9g N,N-dimethylacrylamide, 0.3g maleic anhydride, stir 2 hours, fill the solution with nitrogen for 40 minutes, start heating to 50°C, then add 0.12g ammonium persulfate, and continue to heat up to 70°C, add 0.02g p-hydroxyanisole after 3 hours, and finally get light red or light Yellow viscous liquid.

Embodiment 2

[0047] Add 3g montmorillonite, 0.2g cetyltrimethylammonium bromide and 78g distilled water into a 250mL four-neck flask, mix and stir for 12 hours, add 2.5g potassium hydroxide, 0.3g tributyl phosphate and 0.02g benzene Sodium ethylene sulfonate, 0.01g disodium ethylenediaminetetraacetic acid, 12.8g 2-acrylamido-2-methylpropanesulfonic acid, 3.4g N,N-diethylacrylamide, 0.56g fumaric anhydride, stir 2 hours, fill the solution with nitrogen for 40 minutes, start heating to 55°C, then add 0.21g sodium persulfate, and continue to heat up to 75°C, add 0.02g hydroquinone after 3 hours, and finally get light red or light yellow Viscous liquid.

Embodiment 3

[0049] Add 4g montmorillonite, 0.2g hexadecyldimethylammonium bromide and 78g distilled water into a 250mL four-neck flask, mix and stir for 12 hours, add 2.5g potassium hydroxide, 0.3g emulsified silicone oil, 0.02g thioglycolic acid , 0.01g ethylenediaminetetraacetic acid, 12.8g methacrylic acid, 3.4g N,N-diethylacrylamide, 0.56g fumaric anhydride, stir for 2 hours, inflate the solution with nitrogen for 40 minutes, start heating to 50℃ , Then add 0.21g potassium persulfate, and continue to heat up to 70 ℃, after 3 hours, finally get a light red or light yellow viscous liquid.

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Abstract

The invention discloses a polymer / intercalated montmorillonite compound fluid loss agent and a preparation method thereof. The fluid loss agent has a composite structure comprising a polymer supported in the intercalated layer of montmorillonite. A first monomer, a second monomer and a third monomer undergo a polymerization reaction in the presence of an intercalation agent, water, a pH adjuster, an antifoaming agent, a molecular weight regulator, an anti-metal ion interference agent and an initiator to form a polymer supported in the intercalated layer. The first monomer is 2-acrylamido-2-methylpropanesulfonic acid, the second monomer is N, N-dimethylacrylamide, and the third monomer is maleic anhydride. The method comprises adding the montmorillonite and intercalation agent into water, stirring to mix the materials, adding other raw materials without an initiator into the mixture, carrying out stirring and heating, adding an initiator into the mixture and carrying out a polymerization reaction process. The fluid loss agent has strong calcium and magnesium ion pollution resistance and water loss performances and is particularly suitable for marine drilling and cementing.

Description

Technical field [0001] This application relates to but not limited to the field of cementing oil and gas wells, and specifically relates to but not limited to a polymer / intercalation montmorillonite composite fluid loss reducer and its preparation method and application. Background technique [0002] In the process of drilling and cementing, it is very important to control the water loss performance of cement slurry. If the amount of water loss is too large, it will not only make the performance of the cement slurry worse, affect the quality of drilling, cementing or cementing construction, but also cause a certain degree of damage to the reservoir. Therefore, the water loss of the slurry must be controlled as required. The usual method of controlling water loss is to add a fluid loss agent. There are many materials used as fluid loss agents in oilfields. At present, synthetic fluid loss agents are commonly used, which are generally produced by copolymerization of two or more mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F220/54C08F222/06C08F220/06C08F228/02C08F2/44C08K9/04C08K3/34C09K8/03C09K8/467
CPCC08F2/44C08F220/06C08F220/58C08F220/585C08F228/02C08K3/346C08K9/04C09K8/03C09K8/467C08F220/54C08F222/06
Inventor 宋维凯王清顺冯克满赵琥罗宇维王永松黄卫东
Owner CHINA NAT OFFSHORE OIL CORP
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