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Fluid loss agent for oil well cement as well as preparation method and application of fluid loss agent

A fluid loss agent and oil well cement technology, which is applied in the field of oil and gas well cementing, can solve the problems of poor temperature resistance, unsatisfactory improvement effect, complicated composition and function of fluid loss agent, etc., and achieves excellent high temperature resistance. film-forming effect

Active Publication Date: 2022-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the temperature resistance of polyvinyl alcohol fluid loss reducer is not good. At present, the products with temperature resistance (use temperature) of about 90°C and about 120°C are commonly used.
In this regard, in the prior art, a crosslinking agent is used to crosslink polyvinyl alcohol to improve its temperature resistance, but the effect of improvement is not ideal
In addition, due to the introduction of other monomers such as anions, the composition and function of the fluid loss reducer are complicated, which is not conducive to flexible performance adjustment according to needs when used on site

Method used

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  • Fluid loss agent for oil well cement as well as preparation method and application of fluid loss agent
  • Fluid loss agent for oil well cement as well as preparation method and application of fluid loss agent
  • Fluid loss agent for oil well cement as well as preparation method and application of fluid loss agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1) Prepare raw materials according to the following ratio:

[0055] Water: 100 parts by mass;

[0056] PVA1788 (the degree of polymerization is 1700; the degree of alcoholysis is 88%): 12 parts by mass;

[0057] Trimylene tricarbaldehyde: 0.15 parts by mass;

[0058] Boric acid: 0.15 parts by mass;

[0059] Concentrated hydrochloric acid: 0.15 parts by mass;

[0060] Sodium hydroxide: 0.66 parts by mass.

[0061] 2) Add water into the reaction kettle, add PVA1788 while stirring, raise the temperature to 90°C until PVA1788 is completely dissolved, and keep it for 30 minutes;

[0062] 3) Cool down to 55°C, and add trimesaldehyde while maintaining the temperature, continue to stir for 30 minutes, then add concentrated hydrochloric acid, and keep stirring for 60 minutes;

[0063] 4) Add sodium hydroxide and continue to stir for 30 minutes;

[0064] 5) Add boric acid and continue to stir for 30 minutes to prepare fluid loss reducer 1.

Embodiment 2

[0066] 1) Prepare raw materials according to the following ratio:

[0067] Water: 100 parts by mass;

[0068] PVA1788 (the degree of polymerization is 1700; the degree of alcoholysis is 88%): 8 parts by mass;

[0069] Trimaldehyde: 0.2 parts by mass;

[0070] Boric acid: 0.05 parts by mass;

[0071] Concentrated hydrochloric acid: 0.15 parts by mass;

[0072] Sodium hydroxide: 0.66 parts by mass.

[0073] 2) Add water into the reaction kettle, add PVA1788 while stirring, raise the temperature to 80°C until PVA1788 is completely dissolved, and keep it for 60 minutes;

[0074] 3) Cool down to 60°C, and add trimesaldehyde while maintaining the temperature, continue to stir for 30 minutes, then add concentrated hydrochloric acid, and keep stirring for 60 minutes;

[0075] 4)-5) were carried out in the same manner as in Example 1 to obtain fluid loss reducer 2.

Embodiment 3

[0077] 1) Prepare raw materials according to the following ratio:

[0078] Water: 100 parts by mass;

[0079] PVA2088 (the degree of polymerization is 2000; the degree of alcoholysis is 88%): 10 parts by mass;

[0080] Trimylene tricarbaldehyde: 0.1 parts by mass;

[0081] Boric acid: 0.1 parts by mass;

[0082] Concentrated hydrochloric acid: 0.15 parts by mass;

[0083] Sodium hydroxide: 0.66 parts by mass.

[0084] 2) Add water into the reaction kettle, add PVA2088 while stirring, raise the temperature to 100°C until PVA2088 is completely dissolved, and keep it for 45 minutes;

[0085] 3)-5) were carried out in the same manner as in Example 1 to obtain fluid loss reducer 3.

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Abstract

The invention provides a fluid loss agent for oil well cement. The fluid loss agent is prepared from the following raw materials in parts by mass: 100 parts of water; 7-12 parts by mass of monomer polyvinyl alcohol; 0.1 to 0.2 part by mass of an aromatic aldehyde cross-linking agent; 0.05 to 0.15 part by mass of boric acid; 0.1 to 0.2 part by mass of concentrated hydrochloric acid; and 0.5-0.8 part by mass of sodium hydroxide. The invention also provides a preparation method and application of the fluid loss agent.

Description

technical field [0001] The invention belongs to the field of oil and gas well cementing, and furthermore relates to a fluid loss reducer for oil well cement and its preparation method and application. Background technique [0002] In the cementing operation of oil and gas wells, the cement slurry is pumped into the well by the cement truck, and the cement slurry is replaced into the annular space between the casing and the wellbore through the process of replacing the slurry, so as to isolate the oil, gas and water layers and protect the oil and gas wells. Purpose of producing layer and supporting protective casing. [0003] The fluid loss reducer for oil well cement is an admixture of oil well cement, usually used in the cement slurry used in the cementing operation of oil and gas wells. The fluid loss reducer used in oil well cement can control the fluid loss in the cement slurry to the permeable formation, so as to maintain the appropriate water-cement ratio of the cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C08F8/28C08F116/06
CPCC09K8/467C08F8/28C08F116/06
Inventor 刘学鹏周仕明曾义金
Owner CHINA PETROLEUM & CHEM CORP
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