Tackifying anti-calcium salt polymer filtrate reducer and preparation method

A technology of fluid loss reducer and polymer, which is applied in the field of drilling fluid to achieve the effect of low permeability and good rubber protection effect

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current domestic fluid loss control agents can only be used at 150°C 2+ Content 1.4×10 4 Effectively control fluid loss within mg / L, lack of fluid loss reducer with higher temperature resistance under higher calcium ion content

Method used

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  • Tackifying anti-calcium salt polymer filtrate reducer and preparation method
  • Tackifying anti-calcium salt polymer filtrate reducer and preparation method
  • Tackifying anti-calcium salt polymer filtrate reducer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053](1) Add 10g N-vinylformamide, 6g acrylamide, 80g 2-acrylamido-2-methylpropanesulfonic acid, 2.5g acrylic acid, 1.5g methyl methacrylate into 150g deionized water, and use 40g 40% sodium hydroxide solution adjusts the pH value at 8 to obtain mixed solution A, and the total concentration of monomers in mixed solution A is 34.5%

[0054] (2) Add 0.3g xanthan gum in mixed solution A, pass N 2 After 0.5 hour, mixed solution B was obtained, wherein xanthan gum was 0.1% by weight of mixed solution B.

[0055] (3) Add 0.05 g of initiator ammonium persulfate and sodium bisulfite and 0.3 g of complexing agent disodium edetate to mixed solution B at 50° C., and react for 3 hours to obtain a gel-like product, wherein The initiator dose is 0.1% of the total weight of the monomer; disodium edetate is 0.1% of the weight of the mixed solution B;

[0056] (4) Shear and granulate the gel-like product, dry it at 85°C for 10 hours, and pulverize it to obtain the viscosity-increasing anti...

Embodiment 2

[0059] (1) Add 20g of N-vinylformamide, 5g of acrylamide, 70g of 2-acrylamido-2-methylpropanesulfonic acid, 3g of acrylic acid, and 2g of methyl methacrylate into 100g of deionized water, and use 38g of 40% Sodium hydroxide solution adjusts the pH value at 8 to obtain mixed solution A, and the total concentration of monomers in mixed solution A is about 42%.

[0060] (2) Add 4g polyanionic cellulose (HV-PAC) in mixed solution A, logical N 1 hour, obtain mixed solution B, wherein polyanionic cellulose (HV-PAC) is 1.68% of mixed solution B weight.

[0061] (3) Add 0.05 g of initiator ammonium persulfate and sodium bisulfite and 0.3 g of complexing agent disodium edetate to mixed solution B at 30° C., and react for 5 hours to obtain a gel-like product, wherein The initiator dose is 0.1% of the total weight of the monomers; disodium edetate is 0.13% of the weight of the mixed solution B;

[0062] (4) Shear and granulate the gel-like product, dry it at 90°C for 8 hours, and pulver...

Embodiment 3

[0065] (1) Add 10g of N-vinylformamide, 10g of acrylamide, 77g of 2-acrylamido-2-methylpropanesulfonic acid, 2g of acrylic acid, and 1g of methyl methacrylate into 200g of deionized water, and use 40g of 40% The sodium hydroxide solution adjusted the pH value at 7 to obtain a mixed solution A, and the total concentration of the monomers in the mixed solution A was 29%.

[0066] (2) Add 5g of β-cyclodextrin to the mixed solution A, and pass N2 under stirring for 1.5 hours until the β-cyclodextrin is completely dissolved to obtain a mixed solution B, wherein the β-cyclodextrin is 1.89% of the weight of the mixed solution B .

[0067] (3) Add 0.05 g of initiator ammonium persulfate and sodium bisulfite and 0.5 g of complexing agent disodium edetate to mixed solution B at 60° C., and react for 7 hours to obtain a gel-like product, wherein The amount of initiator is 0.1% of the total weight of the monomer; disodium edetate is 0.15% of the weight of the mixed solution B;

[0068] ...

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Abstract

The invention discloses a tackifying anti-calcium salt polymer filtrate reducer and a preparation method. The filtrate reducer is prepared by polymerizing raw materials of the following monomers in percentage by mass: 5-40% of an N-vinyl amide monomer, 5-30% of an acrylamide monomer, 40-85% of a sulfoacid monomer containing vinyl, 2-20% of an acrylic acid monomer and 1-10% of a methacrylate monomer. The filtration reducer is reasonably interacted with clay particles under high calcium salt by controlling the proportion of adsorption groups and hydrated groups on polymer molecular chains, so that the filtrate reducer is in a proper dispersed state to form a filter cake which is low in permeability, flexible and thin and compact, and the filtration loss of a drilling fluid is reduced; meanwhile, the anti-calcium filtrate reducer has a relatively great molecular weight. Compared with existing anti-salt polymer filtration reducers, the reducer has the advantages that the viscosity reduction rate of the filtrate reducer in a high calcium salt aqueous solution is small, and plays certain roles of coating, inhibiting and viscosity-shearing improving in the high calcium salt drilling fluid.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, and more particularly relates to a viscosity-increasing anti-calcium salt polymer fluid loss reducer and a preparation method thereof. Background technique [0002] Filtrate reducer is an important additive to ensure the stability of drilling fluid performance. It helps the drilling fluid to form a low-permeability, thin and dense filter cake on the well wall. Hydration expansion can achieve the purpose of stabilizing the well wall, ensuring regular well diameter and smooth drilling. [0003] With the increase of the world's energy demand and the development of drilling technology, the formations encountered are becoming more and more complex. Drilling fluids are facing challenges such as high temperature, salt-gypsum formations, fractured formations and high-pressure brine formations. Traditional natural modification and synthetic fluid loss control Chemicals can no longer meet the need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F226/02C08F220/56C08F220/06C08F220/14C08F4/40C09K8/035
CPCC08F4/40C08F220/58C09K8/035C08F220/585C08F226/02C08F220/56C08F220/06C08F220/14
Inventor 杨小华王琳林永学何剑金军斌王海波李雄
Owner CHINA PETROLEUM & CHEM CORP
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