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

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

Inactive Publication Date: 2011-02-09
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 res

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 polyethylene glycol monomethyl ether (PEGM) and 5g maleic anhydride (MA) according to a molar ratio of 1:1.05 and put them into the reaction vessel. The molecular weight of the polyethylene glycol monomethyl ether used is 350. Nitrogen gas was introduced, and the reaction was carried out at 60°C for 3 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). Take 8.5 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and dissolve it in 34 g of water, and adjust the pH value to 7-8 with sodium hydroxide solution at 0-4°C. Then, 23 g of acrylamide (AM) and 92 g 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) and polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA) is 1...

Embodiment 2

[0019] Take 17g polyethylene glycol monomethyl ether and 3.5g maleic anhydride according to a molar ratio of 1:1.04 and put them into the reaction vessel. The molecular weight of the polyethylene glycol monomethyl ether used is 500. Nitrogen gas was passed through and reacted at 65° C. for 2.5 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). Dissolve 14 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) in 56 g of water, and adjust the pH 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), control the total monomer mass concentration to 20%, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), The molar ratio of acrylamide (AM) and polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA) is 2:7:1.

[0020] Stir the materials uniforml...

Embodiment 3

[0022] Put 18 g of polyethylene glycol monomethyl ether and 2.5 g of maleic anhydride into the reaction vessel at a molar ratio of 1:1.06. The molecular weight of the polyethylene glycol monomethyl ether used is 750. Nitrogen gas was passed through and reacted at 68°C for 2.5 hours to obtain polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA). 5.1 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is dissolved in 20.4 g of water, and the pH is adjusted 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), control the total monomer mass concentration to 20%, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), The molar ratio of acrylamide (AM) and polyethylene glycol monomethyl ether maleic anhydride ester (PEGM-MA) is 1:8:1.

[0023] Stir all the materials uniformly, and afte...

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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 temperature-resistant and salt-resistant fluid loss agent in the process of petroleum drilling and a preparation method thereof, and belongs to the technical field of fluid loss agents. Background technique [0002] With the increasing demand for oil in modern society, the difficulty of oil exploration and development is also increasing. Now, global oil and natural gas exploitation has begun to show a trend toward deep land, harsh environments and oceans. [0003] In order to realize the safety and speed of drilling operations and higher comprehensive benefits, it is necessary to improve the performance of the drilling fluid to maintain or basically maintain its original performance under the conditions of high temperature, high pressure and high density. As a drilling fluid additive, fluid loss control agents play an important role in drilling operations. The research direction is mainly divided into two aspects: the modification...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08G65/48C08F283/06
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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