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Oil well cement thixotropic agent and preparation method thereof

A technology of oil well cement and thixotropic agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of temperature sensitivity, weak comprehensive performance, weak thixotropy, etc., and achieve improvement of thixotropy and comprehensive performance good effect

Active Publication Date: 2015-11-04
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides an oil well cement thixotropic agent and a preparation method thereof, which solves the technical problems of weak thixotropy, sensitivity to temperature and poor comprehensive performance of the thixotropic cement slurry system in the prior art, and better realizes The technical effect of sealing the leakage layer and preventing fluid channeling

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  • Oil well cement thixotropic agent and preparation method thereof
  • Oil well cement thixotropic agent and preparation method thereof
  • Oil well cement thixotropic agent and preparation method thereof

Examples

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Embodiment 1

[0040] An oil well cement thixotropic agent provided by an embodiment of the present invention includes: ultrafine clay and an amphoteric polymer, and the mass ratio of the ultrafine clay to the amphoteric polymer is 10:1.

[0041] In this example, the amphoteric polymer is a tetrapolymer synthesized by aqueous radical polymerization.

[0042] Specifically, the tetrapolymer includes: acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid and a cationic monomer, and acrylamide, 2-acrylamido-2-methylpropanesulfonic acid The weight ratio of acid, acrylic acid and cationic monomer is: 35-80 parts of acrylamide, 10-50 parts of 2-acrylamido-2-methylpropanesulfonic acid, 5-15 parts of acrylic acid, 5-5 parts of cationic monomer 30 servings.

[0043] In this embodiment, the cationic monomer is dimethyl diallyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride or octadecyl dimethyl allyl ammonium chloride.

Embodiment 2

[0045] see figure 1 , the preparation method of the oil well cement thixotropic agent provided by the embodiment of the present invention, the method is used to prepare the above-mentioned oil well cement thixotropic agent, comprising:

[0046] Step S110: adding distilled water to the container;

[0047] Step S120: Add 10-50 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-15 parts of acrylic acid into the container, and stir to dissolve;

[0048] Step S130: adjusting the acid-base of the substance in the container, so that the pH of the substance is between 6 and 7;

[0049] To illustrate this step, step S130 specifically includes:

[0050] Add sodium hydroxide solution to the container to acid-base the substance so that the substance has a pH between 6 and 7.

[0051] Step S140: Add 35-80 parts of acrylamide and 5-30 parts of cationic monomer into the container, and stir to dissolve;

[0052] The embodiment of the invention is specifically described:

[0053] Af...

Embodiment 3

[0065] Weigh 15 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5 parts of acrylic acid into a beaker with an appropriate amount of distilled water, and stir to dissolve. Then sodium hydroxide solution was added dropwise to adjust the pH of the system to 6.5, and the mixture was poured into a cleaned three-necked bottle. Add 70 parts of acrylamide and 10 parts of cationic monomer, fill with nitrogen, and start stirring. After all the monomers are dissolved, turn on the heating device to heat the mixed solution in the three-necked bottle. When the temperature of the system reaches 35°C, add 0.5 part of initiator to initiate the polymerization reaction. After reacting in a constant temperature water bath at 50°C for 4-6 hours, a gel-like viscous substance was obtained. The synthetic colloidal viscous material is granulated, dried, and ground to obtain a solid granular product, and the ultrafine clay and the solid granular product are mixed uniformly with a mass ratio of...

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Abstract

The invention relates to the technical field of oil well cement additives, and discloses an oil well cement thixotropic agent and a preparation method thereof. The method comprises the following steps: adding distilled water into a container; adding 10-50 parts of 2-acrylamido-2-methylpropanesulfonic acid and 5-15 parts of acrylic acid into the container, and dissolving by stirring; regulating the pH value of the substance in the container to 6-7; adding 35-80 parts of acrylamide and 5-30 parts of cationic monomer, and dissolving by stirring; heating the container, and adding an initiator to initiate the polymerization reaction to obtain an amphoteric polymer; and mixing superfine clay and the amphoteric polymer in a mass ratio of 10:1 to obtain the oil well cement thixotropic agent. The oil well cement thixotropic agent solves the technical problem of low thixotropy, low sensitivity to temperature and low comprehensive properties in the oil well cement thixotropic agent in the prior art, and better implements the technical effects of plugging the loss zone and preventing the fluid cross flow.

Description

technical field [0001] The invention relates to the technical field of oil well cement admixtures, in particular to an oil well cement thixotropic agent and a preparation method thereof. Background technique [0002] With the increasingly complex geological conditions and increasingly harsh operating environment, cementing technology is facing more and more severe challenges. At present, more and more marine sedimentary reservoirs are encountered in our country's petroleum exploration and development, and the reservoirs are pregnant with a large number of fractures and pores. Both drilling and cementing are faced with the problem of serious lost circulation in marine formations. Cementing leakage is a common problem in my country's oil and gas fields at present, and has brought huge losses to the development of many oil and gas fields. The extremely complex geological conditions not only increase the difficulty of drilling and exploration, but also put forward higher requi...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B24/26
CPCC04B24/2652C09K8/467
Inventor 卢海川邢秀萍李洋尚光远谢承斌李立荣王建东
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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