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Preparation method of viscosity reducer for drilling fluid

A technology of viscosity reducer and drilling fluid, applied in the field of preparation of viscosity reducer for drilling fluid, can solve problems such as inability to meet drilling requirements, and achieve the effects of easy acquisition, outstanding viscosity reduction performance, and simple production process

Active Publication Date: 2018-03-23
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the development of drilling technology, the number of deep wells and ultra-deep wells with a bottom hole temperature exceeding 200°C is increasing. However, the temperature resistance of polymer viscosity reducers currently developed is generally below 180°C, and most commonly used on-site Viscosity reducer products can no longer meet the needs of drilling

Method used

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  • Preparation method of viscosity reducer for drilling fluid
  • Preparation method of viscosity reducer for drilling fluid
  • Preparation method of viscosity reducer for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 130

[0010] Dissolve 15 parts of acrylic acid and 20 parts of 2-acrylamido-2-methylpropanesulfonic acid in 105 parts of deionized water and set aside; dissolve 0.2 parts of ammonium persulfate in 6 parts of deionized water and set aside; Toric anhydride and 1.6 parts of activity regulator were dissolved in 20 parts of deionized water and then transferred to the reactor; after heating the reactor to 60°C, acrylic acid, 2-acrylamido-2-methylpropanesulfonate were stirred The acid mixed solution and the ammonium persulfate solution were slowly added dropwise at the same time. After the dropwise addition, the mixed solution was heated to 90°C, and the stirring speed was adjusted to 300~400r / min. After the pH value is adjusted to 7-8, 80 parts of sodium aminotrimethylene phosphate is added for compounding and blending, and the material is discharged to obtain a copolymer drilling fluid viscosity reducer.

[0011] The above-mentioned active regulator preparation method is as follows:

[...

Embodiment 2

[0014] Exactly the same as Example 1, the difference is: add 10 parts of acrylic acid, 15 parts of 2-acrylamido-2-methylpropanesulfonic acid dissolved in 75 parts of deionized water, add 0.15 parts of ammonium persulfate and dissolve in 5 parts of deionized In water, add 5 parts of maleic anhydride and 1.2 parts of activity regulator to dissolve in 20 parts of deionized water, and add 60 parts of sodium trimethylene phosphate.

Embodiment 3

[0016] It is exactly the same as Example 1, except that 10 parts of acrylic acid and 15 parts of 2-acrylamido-2-methylpropanesulfonic acid are dissolved in 75 parts of deionized water, and 0.175 parts of ammonium persulfate are added and dissolved in 5 parts of deionized In water, add 10 parts of maleic anhydride and 1.4 parts of activity regulator to dissolve in 40 parts of deionized water, and add 70 parts of sodium trimethylene phosphate.

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Abstract

The invention discloses a preparation method of a viscosity reducer for a drilling fluid. The viscosity reducer is prepared from acrylic acid, maleic anhydride, 2-acrylamide-2-methylpropanesulfonic acid and sodium amino-tris(methylenesulphonate) as raw materials through aqueous solution polymerization and physical compounding, wherein the raw materials are in parts by weight as follows: 10-20 parts of acrylic acid, 15-25 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of maleic anhydride and 60-120 parts of aminotri (methylenephosphonic acid) pentasodium salt. A low-molecular-weight polymer is obtained from monomers through polymerization under initiation of an initiator, viscosity of fresh water mud, salt water mud and calcium mud can be reduced effectively when a small quantity of the viscosity reducer is added to the drilling fluid, and the viscosity reducer further has certain fluid loss control property and is applicable to various types of water-based drilling fluid systems.

Description

technical field [0001] The invention relates to the field of preparation of oilfield chemical additives, in particular to a preparation method of a viscosity reducer for drilling fluid. Background technique [0002] Viscosity reducer is an indispensable drilling fluid treatment agent in the drilling process, and it plays a very important role in adjusting the rheology of drilling fluid. During the drilling process, due to the invasion and dispersion of solid particles, the viscosity and shear force of the drilling fluid system are likely to increase significantly. Although the solid control equipment can remove part of the large particle solid phase in the drilling fluid, it can adjust the rheology of the drilling fluid. Therefore, the method of adding viscosity reducer is often used to improve the rheological properties of drilling fluid in field operations. [0003] Since the 1930s, researchers have developed various types of viscosity reducer products, and polymer viscos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F220/06C08F222/06C09K8/035C09K8/24
CPCC08F220/58C08F220/585C08F222/06C09K8/035C09K8/24C08F220/06
Inventor 康建荣
Owner XUZHOU NORMAL UNIVERSITY
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