Comb-like polymer fluid loss additive for drilling fluid and preparation method thereof

A technology of comb polymer and fluid loss reducer, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability of temperature and salt resistance and fluid rheological properties, and achieve low equipment requirements , strong hydration ability, and mild reaction conditions

Inactive Publication Date: 2013-01-02
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims at the deficiencies of existing fluid loss reducers for drilling fluids, such as poor temperature and salt resistance and fluid rheological stability, and provides a comb-type drilling fluid with good temperature and salt resistance and stable fluid rheology. A polymer fluid loss control agent, and at the same time provide a preparation method of the comb-shaped polymer fluid loss control agent with mild synthesis conditions, low equipment requirements and simple process

Method used

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  • Comb-like polymer fluid loss additive for drilling fluid and preparation method thereof
  • Comb-like polymer fluid loss additive for drilling fluid and preparation method thereof
  • Comb-like polymer fluid loss additive for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 17g of polyethylene glycol monomethyl ether (PEGM) and 5g of maleic anhydride (MA) in a molar ratio of 1:1.05, and put them into a reaction vessel. The molecular weight of polyethylene glycol monomethyl ether used is 350. Nitrogen was blown, and the reaction was carried out at 60° C. for 3 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). Dissolve 8.5g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in 34g of water, and adjust the pH value to 7-8 with sodium hydroxide solution at 0-4°C. Then 23g of acrylamide (AM) and 92g of water were added, and the temperature was raised to 70°C. Add 20 g of the obtained polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA), control the total mass concentration of monomers to 20%, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), The molar ratio of acrylamide (AM) to polyethylene glycol monomethyl ether maleic anhydride (PEGM-MA) is 1:8:1.

[0017] Stir all the substances...

Embodiment 2

[0019] Take 17 g of polyethylene glycol monomethyl ether and 3.5 g of maleic anhydride in a molar ratio of 1:1.04 and put them into a reaction vessel. The molecular weight of polyethylene glycol monomethyl ether used is 500. Nitrogen was blown, and the reaction was carried out at 65° C. for 2.5 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). Dissolve 14g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in 56g of water, and adjust the pH value to 7-8 with potassium hydroxide solution at 0-4°C. Then, 16.6 g of acrylamide (AM) and 66.4 g of water were added, and the temperature was raised to 75°C. Add 20 g of the obtained polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA) to control the total monomer mass concentration to 20%, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), The molar ratio of acrylamide (AM) to polyethylene glycol monomethyl ether maleic anhydride (PEGM-MA) is 2:7:1.

[0020] Stir all the substances...

Embodiment 3

[0022] 18 g of polyethylene glycol monomethyl ether and 2.5 g of maleic anhydride were put into the reaction vessel at a molar ratio of 1:1.06, and the molecular weight of the polyethylene glycol monomethyl ether used was 750. Nitrogen was blown, and the reaction was carried out at 68° C. for 2.5 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). Dissolve 5.1 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in 20.4 g of water, and adjust the pH value to 7-8 with sodium hydroxide solution at 0-4°C. Then 14g of acrylamide (AM) and 56g of water were added, and the temperature was raised to 78°C. Add 20 g of the obtained polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA) to control the total monomer mass concentration to 20%, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), The molar ratio of acrylamide (AM) to polyethylene glycol monomethyl ether maleic anhydride (PEGM-MA) is 1:8:1.

[0023] Stir all the substances ev...

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Abstract

The invention provides a comb-like polymer fluid loss additive for drilling fluid and a preparation method thereof. The preparation method comprises the following steps of: performing esterification on polyethylene glycol monomethyl ether (PEGM) and maleic acid (MA) to obtain macromonomers; and adding two monomers, namely acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) into the macromonomers to perform copolymerization so as to obtain the comb-like polymer fluid loss additive with a long side chain by a solution polymerization method. The prepared comb-like polymer fluid loss additive has the advantages of resisting the temperature of 200 DEG C in the drilling fluid, along with good fluid loss reducing effect on the drilling fluid such as fresh water, saline and the like, capacity of controlling the drilling liquid to keep high rheological property under the condition of high temperature and high salinity, high temperature and salt resistance, stable fluid rheological property, mild synthesis condition, low equipment requirement and simple process.

Description

technical field [0001] The invention relates to a heat-resistant and salt-resistant fluid loss reducer in the oil drilling process and a preparation method thereof, belonging to the technical field of the fluid loss reducer. Background technique [0002] With the increasing demand for oil in modern society, the difficulty of oil exploration and development is also increasing. Now, the exploitation of oil and natural gas in the world has begun to show a trend of developing towards deep land, harsh environment areas and oceans. [0003] In order to achieve safe and rapid drilling operations and high comprehensive benefits, it is necessary to improve the performance of drilling fluid so that it can maintain or basically maintain its original performance under high temperature, high pressure, and high density conditions. As a drilling fluid additive, fluid loss reducer plays an important role in drilling operations. Its research direction is mainly divided into two aspects: th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F283/06C08G65/48
Inventor 徐健王立亚孙德军苏秀纯李洪俊代礼杨
Owner SHANDONG UNIV
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