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Crosslinking fluid loss agent preparation method

A technology of fluid loss reducer and cross-linking monomer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor temperature resistance, and improve viscoelastic performance, temperature resistance, and adsorption capacity Strong, good polymerization activity

Inactive Publication Date: 2013-08-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymers are all made of monoolefin monomers. While introducing cross-linkable structural units, the molecular structure does not contain residual double bonds. It has the advantages of good thermal stability and chemical stability. It can solve the problem of ordinary linear acrylamides. When the polymer is used as a fluid loss control agent, its temperature resistance is poor

Method used

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  • Crosslinking fluid loss agent preparation method
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  • Crosslinking fluid loss agent preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the present embodiment, adopt following mass parts raw material:

[0029]

[0030] The process steps are as follows:

[0031] 1. Mix the purified 3 / 4 butyl acrylate, 1 / 4 methyl methacrylate, 1 / 4 cross-linking monomer and compound emulsifier evenly, then add it to a three-necked bottle, and stir it quickly with a stirrer for 30 minutes to prepare a pre-emulsion .

[0032] 2. Heat the three-necked bottle with the pre-emulsion in a water bath. When the temperature reaches 70°C, nitrogen gas is introduced. After 10 minutes, 2 / 3 of the initiator is slowly added dropwise and stirred at a constant speed. The stirring speed is controlled within 100r / min. After keeping blue for a period of time, add the remaining monomer and initiator dropwise, and react at constant temperature for 2 hours. After cooling, add sodium bicarbonate solution dropwise to adjust the pH value to 6-7, and discharge to obtain fluid loss reducer FL-0.

Embodiment 2

[0034] In this example, except that the cross-linking monomer GMA accounts for 1% of the monomer content, the total amount of monomers remains unchanged, and the other three main monomers are reduced in the same proportion, and the mass percentages of other raw materials are the same as in Example 1 .

[0035] In this example, the process steps of preparing the fluid loss control agent FL by emulsion polymerization are the same as those in Example 1 to obtain the fluid loss control agent FL-1.

Embodiment 3

[0037] In this example, except that the cross-linking monomer GMA accounts for 3% of the monomer content, the total amount of monomers remains unchanged, and the other three main monomers are reduced in the same proportion, and the mass percentages of other raw materials are the same as in Example 1 .

[0038] In this example, the process steps of preparing the fluid loss control agent FL by emulsion polymerization are the same as those in Example 1 to obtain the fluid loss control agent FL-2.

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Abstract

The invention discloses a crosslinking fluid loss agent preparation method. The method comprises steps of: adopting acrylic ester and acrylamide as main monomers of the crosslinking fluid loss agent and glycidyl acrylate as a crosslinking monomer of the crosslinking fluid loss agent, selecting a water-soluble radical initiator, and synthesizing a copolymer in the presence of nitrogen through adopting an emulsion polymerization method. The polymerization reaction time takes 2 hours, the insulation time costs 2 hours, the pH value is set to be 6-7, and the polymerization experimental reaction temperature is 70 DEG C. The copolymer prepared by the method can crosslink at the temperature of above 130 DEG C so as to form a proper crosslinking network structure, so that the viscoelasticity and temperature resistance of cement slurry can be improved, a problem of the poor temperature resistance of an acrylamide polymer which is served as a fluid loss agent can be solved, and the fluid loss reduction performance of the fluid loss agent in deep wells and ultradeep wells is improved. The crosslinking fluid loss agent mainly serves as the fluid loss agent for the well cementation cement slurry of oil-gas wells.

Description

Technical field: [0001] The invention relates to a preparation method of a crosslinkable fluid loss reducer, which is mainly used as a fluid loss reducer in oil and gas well cementing cement slurry. Background technique: [0002] During the cementing construction of oil and gas wells, due to the effect of pressure, the liquid phase in the cement slurry will leak to the permeable formation, which will affect the solidification of the cement slurry and the construction fluidity, resulting in a decline in the cementing quality; at the same time, due to the excessive density of the cement slurry If it is too high, it will cause well leakage and pollute the formation. In order to prevent filtrate loss, it is necessary to add fluid loss control agent to the cement slurry during the cementing process. [0003] At present, acrylamide polymer fluid loss control agent is the most widely used, but its poor temperature resistance, especially in deep well and ultra-deep well operation, ...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/14C08F220/56C08F220/32C08J3/24C09K8/035
Inventor 何显儒冯春辉王煦张睿侯海龙陈前蔡术威
Owner SOUTHWEST PETROLEUM UNIV
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