Inter permeable network type polymer fluid loss agent and preparation method thereof

A technology of interpenetrating network type and fluid loss control agent, which is applied in the field of interpenetrating network type polymer fluid loss control agent and its preparation, can solve the problem that the wellbore stability cannot be fully satisfied, the synthesis conditions of fluid loss control agent are not easy to control, Product quality is difficult to grasp and other issues, to achieve the effect of low cost, easy handling, and not easy to gather

Active Publication Date: 2014-06-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The synthesis conditions of these fluid loss control agents are not easy to control, and the product quality is not easy to grasp, which can no longer fully meet the requirements of increasing drilling speed, inhibiting formation slurrying and improving wellbore stability

Method used

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  • Inter permeable network type polymer fluid loss agent and preparation method thereof
  • Inter permeable network type polymer fluid loss agent and preparation method thereof
  • Inter permeable network type polymer fluid loss agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Preparation of interpenetrating network polymer fluid loss control agent

[0053] (1) Get 78g 2-acrylamido-2-methylpropanesulfonic acid, 9g acrylamide, 6g N, N-dimethylacrylamide and 7g N-vinylpyrrolidone four monomers and dissolve them in water respectively. The molar percentages of the monomers are 60%, 20%, 10% and 10% successively to obtain 1000g of mixed solution A, and the total weight concentration of the four monomers in the mixed solution A is 10%;

[0054] (2) Add 3g of natural polymer sodium alginate to mixed solution A, pass N 2 After 3 hours, 1003g of mixed solution B was obtained, wherein sodium alginate was 0.3% of the weight of mixed solution A;

[0055] (3) The mixed solution B was reacted for 8 hours at 90° C., pH=10, adding 0.05 g of initiator potassium persulfate and 0.3009 g of complexing agent disodium ethylenediamine tetraacetate to obtain a viscous product, wherein persulfuric acid Potassium is 0.05% of the total monomer weight (100g); EDTA ...

Embodiment 2

[0078] 1. Preparation of interpenetrating network polymer fluid loss control agent

[0079] (1) Take 70g of 2-acrylamido-2-methylpropanesulfonic acid, 180g of acrylamide, 33g of N,N-dimethylacrylamide and 17g of N-vinylpyrrolidone and dissolve them in water respectively. The molar percentage of monomer is 10%, 75%, 10% and 5% successively, obtains 1000g mixed solution A, and the total mass concentration of four kinds of monomers in mixed solution A is 30%;

[0080] (2) Add 50g homopolymer polyacrylamide to the mixed solution A, pass N 2 After 2 hours, 1050 g of mixed solution B was obtained, wherein the mass of polyacrylamide was 5% of the mass of mixed solution A;

[0081] (3) The mixed solution B was reacted for 5 hours at 60° C., pH=3, adding 0.3 g of initiator sodium persulfate and 0.525 g of complexing agent disodium ethylenediamine tetraacetate to obtain a sticky product, in which The mass of sodium sulfate is 0.1% of the total mass of the monomer (300g); the mass of d...

Embodiment 3

[0089] 1. Preparation of interpenetrating network polymer fluid loss control agent

[0090] (1) Get 143g 2-acrylamido-2-methylpropanesulfonic acid, 49g acrylamide, 170g N, N-dimethylacrylamide and 38g N-vinylpyrrolidone four monomers and dissolve in water respectively, four The molar percentages of the monomers are 20%, 20%, 50% and 10% in sequence to obtain 1000 g of mixed solution A, and the total mass concentration of the four monomers in mixed solution A is 40%.

[0091] (2) Add 20g homopolymer poly(2-acrylamido-2-methylpropanesulfonic acid) to the mixed solution A, pass N 2 After 1 hour, 1020 g of mixed solution B was obtained, wherein the mass of poly(2-acrylamido-2-methylpropanesulfonic acid) was 2% of the mass of mixed solution A.

[0092] (3) The mixed solution B was reacted for 2 hours at 75° C., pH=7, adding 0.8 g of initiator ammonium persulfate and 1.02 g of complexing agent disodium ethylenediamine tetraacetate to obtain a viscous product, in which The quality ...

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Abstract

The invention discloses an inter permeable network type polymer fluid loss agent and a preparation method thereof, wherein the method comprises the following steps: (1) dissolving four monomers of 2-acrylamido-2-methyl propane sulfonic acid, acrylamide, N, N-methacrylamide and N-vinyl pyrrolidone into water, thus obtaining a mixed solution A; (2) adding natural or synthetic polymer into the mixed solution A, and introducing nitrogen (N2), thus and obtaining a mixed solution B; (3) adding an initiator and a complexing agent into the mixed solution B to react, thus obtaining a viscous product; and (4) drying and grinding the viscous product, thus obtaining the inter permeable network type polymer fluid loss agent. The method has the characteristics of large preparation amount, simple technology, low cost, high yield, moderate controllable conditions, low toxicity, low emission and the like, and the fluid loss agent is quick to dissolve and resistant to high temperature, resists salt to saturate, and has the prominent characteristics of improved drilling speed, inhibition for stratum pulping, improved borehole wall stability and the like.

Description

technical field [0001] The invention relates to the field of petroleum drilling, and more specifically relates to an interpenetrating network polymer fluid loss reducer and a preparation method thereof. Background technique [0002] Filtrate reducer is an important drilling fluid treatment agent to ensure the stability of drilling fluid performance, reduce the loss of harmful liquid to the formation, stabilize the wellbore wall and ensure regular well diameter. With the development of oilfield drilling and the increase of deep well offshore drilling projects, the requirements for fluid loss reducers in drilling fluids are also increasing to meet the salt tolerance (NaCl content greater than 30%) and high temperature resistance (temperature higher than 200 ° C, Even 240°C) new requirements. Currently commonly used fluid loss additives can be classified into the following categories according to their chemical components: (1) natural materials and natural modified materials; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/58C08F220/54C08F226/10
Inventor 朱腾王显光王琳徐健孙德军苏长明李家芬钱晓琳杨小华
Owner CHINA PETROLEUM & CHEM CORP
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