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A polymer inhibitor for clay-free drilling fluid and preparation method thereof

A technology of polymer and drilling fluid, applied in the field of polymer inhibitor and its preparation, can solve the problems such as insufficient anti-slump resistance and insufficient temperature resistance, achieve strong anti-slump resistance, improve anti-slump ability, and inhibit water effect of swelling

Active Publication Date: 2017-05-17
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the existing inhibitors for clay-free drilling fluids, such as insufficient anti-slumping ability and insufficient temperature resistance, and provide a polymer inhibitor for clay-free drilling fluids with a temperature resistance of 200 ° C. The preparation method of this drilling fluid polymer inhibitor

Method used

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  • A polymer inhibitor for clay-free drilling fluid and preparation method thereof
  • A polymer inhibitor for clay-free drilling fluid and preparation method thereof
  • A polymer inhibitor for clay-free drilling fluid and preparation method thereof

Examples

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preparation example 1

[0025] Add 36g of acrylamide, 20g of N,N-dimethylacrylamide, 25g of N-vinyl-2-pyrrolidone, and 19g of dimethyldiallyl ammonium chloride into 100g of water and adjust the pH value to 9. Add 0.2 g ammonium persulfate and 0.2 g sodium bisulfite, react at 30°C for 0.5h to 1h to obtain a gel-like polymer, the product is sheared, granulated, dried and crushed at 60°C to obtain clay-free Polymer inhibitors for drilling fluids.

preparation example 2

[0027] Add 60g of acrylamide, 16g of N,N-dimethylacrylamide, 14g of 2-acrylamido-2-methylpropanesulfonic acid, and 10g of dimethyldiallylammonium chloride into 100g of water and adjust the pH value to 10. Add 0.15g of ammonium persulfate and 0.15g of sodium bisulfite respectively, and react at 30°C for 0.5h to 1h to obtain a gel-like polymer. The product is sheared, granulated, and dried at 60°C. Crush to obtain polymer inhibitors for clay-free drilling fluids.

preparation example 3

[0029] Add 61g of acrylamide, 5g of N,N-dimethylacrylamide, 20g of 2-acrylamido-2-methylpropanesulfonic acid, 14g of dimethyl diallyl ammonium chloride into 120g of water and adjust the pH value to 11. Add 0.1g of ammonium persulfate and 0.1g of sodium bisulfite respectively, and react at 30°C for 0.5h to 1h to obtain a gel-like polymer. The product is sheared and granulated, and dried at 60°C. Crush to obtain polymer inhibitors for clay-free drilling fluids.

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Abstract

Belonging to the technical field of preparation methods for petroleum drilling oilfield chemistry macromolecular polymers, the invention discloses a polymer inhibitor for clay phase-free drilling fluid and a preparation method thereof. The polymer inhibitor is formed by copolymerization of an organic amide monomer A, an amido hydrolysis inhibiting monomer B and a cationic monomer C according to a mass percentage of (56-76):(10-25):(14-19) under the action of an initiator and a pH value regulator. The intrinsic viscosity number of the polymer inhibitor is 2.0-3.0dl / g. The shale with a clear water recovery rate of 3.6% is employed to perform shale recovery experiment on the obtained product. A 0.5% aqueous solution of the polymer inhibitor can reach a primary shale recovery rate of higher than 90% after 16h at 200DEG C and a relative shale recovery rate of higher than 98%, and a contrast example, i.e. a 2% high temperature resistant polyamine inhibitor solution only has a primary shale recovery rate of 64.2% after 16h at 200DEG C. With good sloughing inhibiting and preventing ability under high temperature conditions, the polymer inhibitor provided by the invention can be used for weak gel clay phase-free drilling fluid to effectively inhibit hydration expansion of mud shale and ensure safe and fast drilling of a special process well, thus further improving the wellbore wall stabilization capacity.

Description

[0001] Technical field: [0002] The invention relates to a polymer inhibitor for clay-free drilling fluid and a preparation method thereof, which belongs to the technical field of preparation methods of chemical polymers in petroleum drilling and oilfields. [0003] technical background: [0004] With the deep development of petroleum exploration and development, more and more deep wells and special craft wells have put forward higher requirements for drilling fluid technology. Clay-free drilling fluid has good inhibition, good shear dilution and strong More and more people pay more and more attention to its reservoir protection ability, and it is an effective technical measure for safe and rapid drilling of special craft wells such as slim hole wells and horizontal wells and reservoir protection. At present, organic salts (sodium formate, potassium formate), inorganic salts (potassium chloride), polyalcohols, and polyamines are mostly used as inhibitors in clay-free drilling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/54C08F226/10C08F226/02C08F220/58C08F4/40C09K8/035
Inventor 苏雪霞孙举李午辰郑志军宋亚静王中华万龙
Owner CHINA PETROCHEMICAL CORP
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