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Cement-formation filtration control agent

A technology of fluid loss reducing agent and cementing cement, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor salt resistance and temperature resistance, and achieve high salt resistance and high resistance Pollution ability and good compatibility

Active Publication Date: 2012-01-11
天津科力奥尔工程材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The two major problems facing the current fluid loss reducer are poor temperature resistance and poor salt resistance. Therefore, the market has been looking forward to a cement fluid loss reducer that has better anti-water loss effect at higher temperatures, and in Cement fluid loss reducer that can also reduce water loss of cement slurry in salt water system

Method used

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  • Cement-formation filtration control agent
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 200g of sodium 2-acrylamido-2-methylpropanesulfonate, 33g of acrylamide, 5g of acrylic acid, 25g of succinic anhydride, and 600g of water; start stirring, add the four monomers into the water in turn, stir well and then add 165g Na 2 CO 3 After that, the temperature was raised to 65°C, 30g of persulfate was added, and the temperature was kept at 80°C for 100 minutes to carry out the polymerization reaction; then 35g of benzoate was added, and the stirring was continued for half an hour to obtain the tetrapolymer fluid loss reducer of the present invention.

[0036] According to the standard method stipulated by the industry, the fluid loss reducing agent of the present invention is measured, and the fluid loss of the above product is detected to be 55mL.

Embodiment 2

[0038] Take 150g of 2-acrylamido-2-methylpropanesulfonic acid, 50g of acrylamide, 8g of acrylic acid, 25g of D component succinic anhydride, 600g of water, 165g of Na 2 CO 3 , persulfate 20g, benzoate 25g;

[0039] The fluid loss reducer of the present invention was obtained by operating and testing according to the method described in Example 1, and the fluid loss was detected to be 52 mL.

Embodiment 3

[0041] Take 200g of sodium 2-acrylamido-2-methylpropanesulfonate, 65g of acrylamide, 10g of acrylic acid, 25g of succinic anhydride, 600g of water, and 163g of Na 2 CO 3 , persulfate 25g, benzoate 30g, get fluid loss reducer of the present invention.

[0042] The fluid loss reducer of the present invention was obtained by operating and testing according to the method described in Example 1, and the fluid loss was detected to be 58 mL.

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Abstract

The invention discloses an oil-field cement-formation filtration control agent with high temperature resistance and high salt resistance, which comprises the following components by weight percent: 1 to 80 percent of component A, 1 to 60 percent of component B, 1 to 30 percent of component C and 1 to 20 percent of component D. The cement-formation filtration control agent has wide temperature application range, the salt resistance can reach the saturation saline water, the filtration control effect is obvious, the thickening time is adjustable, and the performance is stable.

Description

technical field [0001] The invention relates to a cement fluid loss reducing agent for oil well cementing, which belongs to the field of oilfield building materials. Background technique [0002] Oil well cement is used to seal the annulus between the well wall and the casing. When sealing, the cement slurry is generally pumped into the casing, and the cement slurry is returned from the annulus. When using this method, when the cement passes through the permeable formation under pressure, the loss phenomenon will occur, that is, the water phase in the cement will separate and enter the formation, leaving cement particles. This phenomenon is called "water loss". When the cement encounters a shale layer, the water in the cement slurry will seep into the formation, resulting in a continuous decrease in the volume of the water phase. In severe cases, the cement slurry will become impossible to pump. , and even make the oil well scrapped. [0003] Adding cement fluid loss redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/487
Inventor 刘中华
Owner 天津科力奥尔工程材料技术有限公司