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Preparation method of fluid loss additive for oil-well cement

The technology of fluid loss reducer and oil well cement is applied in the field of deep well oil drilling fluid, which can solve the problems of complicated operation, sedimentation, dehydration and the like, and achieves the effects of high feasibility, improved grafting rate and simple method.

Inactive Publication Date: 2016-11-16
天津开发区四达科工贸发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preparing fluid loss additives using lignin as a monomer usually refers to a method proposed for one scheme, which is cumbersome to operate, and the crosslinking agent used is usually not stable, and dehydration and precipitation will occur. Conducive to the quality of fluid loss control agent products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:

[0017] (1) Weigh 2g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 0.64×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 15 minutes;

[0018] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:1, dissolve them in water and adjust the pH to 6, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 1.85 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 15 minutes;

[0019] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, heat up to 55° C., react for 4 hours under continuous stirring environment, and carry out inoculation Branch modificati...

Embodiment 2

[0026] Embodiment 2: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:

[0027] (1) Weigh 5g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 2.56×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 30 minutes;

[0028] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:3, dissolve them in water and adjust the pH to 7, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 7.40 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 20 minutes;

[0029] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, raise the temperature to 65° C., react for 6 hours under continuous stirring environment, and carry out inoculation Bra...

Embodiment 3

[0036] Embodiment 3: a kind of preparation method of oil well cement fluid loss reducer, comprises the following steps:

[0037] (1) Weigh 3g of lignin and dissolve it in deionized water, add redox initiator ferrous ammonium sulfate and hydrogen peroxide, the concentration of ferrous ammonium sulfate is 1.92×10 -4 mol / g, feed nitrogen, and initiate at 50°C for 20 minutes;

[0038] (2) Take two kinds of anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate in a ratio of 4:2, dissolve them in water and adjust the pH to 7, add potassium persulfate as an initiator, and the concentration of potassium persulfate is 3.70 ×10 -5 mol / g, feed nitrogen, and initiate at 50°C for 18 minutes;

[0039] (3) Mix the initiated lignin monomer and two kinds of anionic monomers together, add aluminum citrate cross-linking agent and continuously feed nitrogen gas, raise the temperature to 60° C., react for 5 hours under continuous stirring environment, and carry out inoculation Bra...

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Abstract

The present invention is a kind of preparation method of oil well cement filtrate reducer, comprising the following steps: (1) dissolving lignin in deionized water, adding redox initiator ferrous ammonium sulfate and hydrogen peroxide, feeding nitrogen to initiate; ( 2) Weigh two anionic monomers of acrylic acid and sodium p-vinylbenzenesulfonate, dissolve them in water and adjust the pH to 6-7, add potassium persulfate as an initiator, and feed nitrogen to initiate; (3) Mix the lignin monomer and two kinds of anionic monomers, add aluminum citrate cross-linking agent and continuously feed nitrogen to carry out graft modification; (4) after the reaction is completely finished, add absolute ethanol, demulsify and filter, A solid product was obtained. In the present invention, lignin macromolecules and modified monomers are respectively initiated to increase the grafting rate of the polymerization reaction, and aluminum citrate is used as a crosslinking agent, which is stable and conducive to the production of high-quality products. The method of the present invention is simple and can For a variety of grafting monomers, the feasibility is very high.

Description

technical field [0001] The invention relates to the field of deep well oil drilling fluids, in particular to a preparation method of an oil well cement fluid loss reducer. Background technique [0002] With the increasing demand for energy in the process of my country's economic and industrial growth, domestic exploration and development of petroleum resources are also deepening. As an important treatment agent in deep well oil drilling fluid, high temperature resistant fluid loss reducer can reduce the fluid loss of drilling fluid and ensure the smooth progress of oilfield production process. It has always been the focus in the field of oilfield chemical research. Lignin, as the second largest natural polymer material in nature, and the main by-product of paper production, its rational development and utilization will greatly solve the problem of environmental pollution and create economic benefits with sustainable development. The traditional method of preparing fluid los...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F220/06C08F212/14C08F220/56C08F220/58C08F4/40C08K5/098C09K8/035
CPCC08F289/00C08F4/40C08K5/098C09K8/035
Inventor 钱经纬钱安凯
Owner 天津开发区四达科工贸发展有限公司
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