Suspended stable fluid loss agent, preparation method thereof and application of fluid loss agent in horizontal well cementation

A water loss reducing agent and suspension stabilization technology, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., and can solve problems such as poor cementing quality and increased total addition

Active Publication Date: 2021-09-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a suspension-stable fluid loss reducer, its preparation method, and its application in horizontal well cementing, so as to solve the problems of the existing fluid loss reducer and suspension stabilizer in the cement slurry. When the water loss and stability of the system are adjusted, the increase in the total amount of the two will lead to the deterioration of the cementing quality

Method used

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  • Suspended stable fluid loss agent, preparation method thereof and application of fluid loss agent in horizontal well cementation
  • Suspended stable fluid loss agent, preparation method thereof and application of fluid loss agent in horizontal well cementation
  • Suspended stable fluid loss agent, preparation method thereof and application of fluid loss agent in horizontal well cementation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The first step, the preparation of the polymer backbone

[0050] Put 5.63 parts by weight of sodium styrene sulfonate (SSS) and 5.25 parts by weight of acrylic acid (AA) into the reactor, stir evenly with distilled water to obtain the first mixed system; use NaOH aqueous solution to adjust the first mixed system. The pH value is 6, and the first mixed system is stirred and mixed with 4.55 parts by weight of N,N-dimethylacrylamide (DMAA) and 1.22 parts by weight of N-vinylpyrrolidone (NVP) to obtain the second mixed system; adjust The solid content of the second mixed system is 20wt%, at N 2 Keep the temperature at 40°C in the atmosphere, and carry out the first mixing and stirring of the second mixed system with ammonium sulfate and sodium bisulfite, and stir for 4 hours to obtain the post-polymerization system; after cooling the post-polymerization system to room temperature, gradually add into acetone (Ac), filter the precipitated product to be a linear main chain po...

Embodiment 2

[0054] The first step, the preparation of the polymer backbone

[0055]Put 4 parts by weight of SSS and 6 parts by weight of AA into the reactor, stir evenly with distilled water to obtain the first mixed system; use NaOH aqueous solution to adjust the first pH value of the first mixed system to 6, and make the first mixed system Stir and mix with the DMAA of 3 weight parts, the NVP of 2 weight parts, get the second mixing system; Adjust the solid content of the second mixing system to be 20wt%, in N 2 Keep the temperature at 40°C in the atmosphere, and carry out the first mixing and stirring of the second mixed system with ammonium sulfate and sodium bisulfite, and stir for 4 hours to obtain the post-polymerization system; after cooling the post-polymerization system to room temperature, gradually add into Ac, filter the precipitated product to be a linear main chain polymer, and dry it for later use.

[0056] The second step, the preparation of graft copolymer

[0057] 15 ...

Embodiment 3

[0059] The first step, the preparation of the polymer backbone

[0060] In parts by weight, put 7 parts by weight of SSS and 4 parts by weight of AA into the reactor, stir evenly with distilled water to obtain the first mixed system; use NaOH aqueous solution to adjust the first pH of the first mixed system to be 6, The first mixing system is stirred and mixed with 5 parts by weight of DMAA and 0.50 parts by weight of NVP to obtain a second mixing system; the solid content of the second mixing system is adjusted to be 20wt%. 2 Keep the temperature at 40°C in the atmosphere, and carry out the first mixing and stirring of the second mixed system with ammonium sulfate and sodium bisulfite, and stir for 4 hours to obtain the post-polymerization system; after cooling the post-polymerization system to room temperature, gradually add into Ac, filter the precipitated product to be a linear main chain polymer, and dry it for later use.

[0061] The second step, the preparation of graf...

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Abstract

The invention provides a suspended stable fluid loss agent, a preparation method thereof and application of the fluid loss agent in horizontal well cementation. The preparation method comprises the following steps: S1, carrying out polymerization reaction on 4-7 parts by weight of sodium p-styrenesulfonate, 4-6 parts by weight of acrylic acid, 3-5 parts by weight of N, N-dimethylacrylamide and 0.5-2 parts by weight of N-vinyl pyrrolidone to obtain a linear main chain polymer; and S2, carrying out graft copolymerization modification on the linear main chain polymer by adopting 0.5 to 2 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 0.2 to 1.0 part by weight of acrylic acid, 0.2 to 1.2 parts by weight of N, N-dimethylacrylamide and 0.05 to 0.3 part by weight of methyl acrylate, so as to obtain the suspended stable fluid loss agent. The suspended stable fluid loss agent has the characteristics of fluid loss reduction property, suspension stability, low viscosity, good compatibility and low cost, and can improve the well cementation quality of a horizontal well.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a suspension-stable fluid loss reducer, its preparation method and its application in horizontal well cementing. Background technique [0002] With the continuous increase of global primary energy consumption, increasing the exploration and development of unconventional oil and gas resources such as proven and undeveloped low-grade reserves and shale gas, tight oil, and tight gas has become a promising prospect for the oil and gas industry. An important direction for sustainable development. In view of the characteristics of low-grade oil and gas resources in old oilfields such as low abundance, low permeability, and low single-well production, unconventional oil and gas resource reservoirs in new blocks are dense, source-reservoir integration, and micro-nano-scale pore-throat system development, etc. Large oil service companies widely adopt the "horizontal well + ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F273/00C08F220/58C08F220/06C08F220/14C08F220/54C08F228/02C08F226/10C08F265/02C09K8/487C09K8/467E21B33/13
CPCC08F273/00C08F265/02C08F228/02C08F220/06C09K8/487C09K8/467E21B33/13C08F220/14C08F220/54C08F226/10
Inventor 吕斌靳建洲于永金曲从锋徐明齐奉忠王兆会张华张弛刘子帅周崇峰丁志伟夏修建郭玉超纪宏飞周琛洋张晓兵郭雪利
Owner BC P INC CHINA NAT PETROLEUM CORP
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