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Oil well cement inhibiting agent

A technology of oil well cement and retarder, which is applied in the directions of drilling compositions, chemical instruments and methods, can solve the problems of affecting the strength development of cement stone and the sensitivity of sugar compound addition, and achieves improved displacement efficiency and transition time. Short, applicable temperature range effect

Active Publication Date: 2009-02-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these retarders have certain defects, for example: lignosulfonates are only suitable for use at medium and low temperatures (≤90°C); hydroxycarboxylates are only suitable for use at higher temperatures (≥120°C) ; The amount of sugar compound is very sensitive; Cellulose affects the strength development of cement stone; Boric acid usually needs to be used in combination with other retarders

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, a multi-component copolymer is prepared. Add 35g of itaconic acid and 100g of 2-acrylamido-2-methylpropanesulfonic acid into 500g of deionized water, dissolve them and add them into the reactor, put the reactor into a constant temperature water bath at 60°C, Introduce nitrogen gas for 30 minutes to exclude oxygen. After the temperature of the aqueous solution in the reactor reaches 60°C, add 27g of 10% potassium persulfate initiator solution in batches within 30 minutes, and make the reaction last for 3h-4h to obtain multi-component copolymerization substance solution. The effective content of this solution is 20%.

[0024] Then, get 600g polymer solution (polymer quality is 120g) and 80g hydroxyethylidene diphosphonic acid solution (effective content 50%, hydroxyethylidene diphosphonic acid quality is 40g), the two are mixed to obtain 680g retarder Sample 1. In sample 1, the number of parts by weight of the multi-polymer is 75, and the number of parts by weig...

Embodiment 2

[0029] First, a multi-component copolymer is prepared. Add 30g of acrylic acid, 20g of itaconic acid, and 100g of 2-acrylamido-2-methylpropanesulfonic acid into 570g of deionized water, dissolve them and add them into the reactor, and put the reactor into a constant temperature water bath at 60°C. Introduce nitrogen into the reactor for 30 minutes to exclude oxygen. After the temperature of the aqueous solution in the reactor reaches 60°C, add 30 g of 10% concentration of potassium persulfate initiator solution in batches within 30 minutes to make the reaction last for 3 hours to 4 hours. A polypolymer solution was obtained. The effective content of this solution is 20%.

[0030] Then, get 630g polymer solution (polymer quality is 126g) and 28g aminotrimethylene phosphonic acid solution (effective content 50%, aminotrimethylene phosphonic acid quality is 14g), the two are mixed to obtain 658g retarder sample 2 . In sample 2, the number of parts by weight of the multi-polyme...

Embodiment 3

[0034] First, a multi-component copolymer is prepared. Add 20g of itaconic acid, 10g of maleic anhydride, 20g of acrylamide, and 100g of 2-acrylamido-2-methylpropanesulfonic acid into 570g of deionized water, dissolve them in the reactor, and place the reactor in 60 ℃ in a constant temperature water bath, feed nitrogen into the reactor for 30 minutes to exclude oxygen, and after the temperature of the aqueous solution in the reactor reaches 60 ℃, add 30 g of 10% potassium persulfate initiator solution in batches within 30 minutes to make the reaction continue 3h-4h, the multi-component copolymer solution was prepared. The effective content of this solution is 20%.

[0035] Then, get 600g polymer solution (polymer quality is 120g) and 160g hydroxyethylidene diphosphonic acid solution (effective content 50%, hydroxyethylidene diphosphonic acid quality is 80g), the two are mixed to obtain 760g retarder Sample 3. In sample 3, the number of parts by weight of the multi-polymer i...

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PUM

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Abstract

The invention relates to a retarder for cement paste used in petroleum drilling, completion or well cementing operation, which comprises two components. The two components are a multipolymer containing carboxylic acid groups accounting for 60 to 90 portions by weight and an organic phosphonic acid and salts thereof accounting for 10 to 40 portions by weight. The average relative molecular mass of the multipolymer containing carboxylic acid groups is 2,000 to 20,000. The applicable temperature scope of the cement retarder is wide, and the cement retarder can be applied at high temperature, medium and low temperatures. The applicable temperature scope ranges from 30 DEG C to 230 DEG C. The cement retarder can be matched with various additives and is very compatible, which is applicable for oil well cement of various grades. The retarder can resist salt well, which is applicable for fresh water, brine, seawater, concentrated water and so on. The retarder can be widely applied in various shallow holes, moderate-depth holes, deep holes and superdeep holes. An excess amount of retarder is not sensitive in brine and seawater; the construction safety is ensured; the retarder does not adversely affect the strength development of cement.

Description

technical field [0001] The invention relates to a retarder for cement slurry used in oil drilling, well completion or well cementing operations. Background technique [0002] The cement retarder of the present invention is a kind of cement admixture, and is usually used in the cement slurry used in the cementing operation of oil and gas wells. In the cementing operation of oil and gas wells, the cement slurry is injected into the well by pumping, and the cement slurry is replaced into the annular space between the casing and the wellbore by pumping, so as to isolate oil, gas, water layers, protect production layers and The purpose of supporting the protective casing. The grout should have good pumpability until it is delivered to the required location. As the hydration reaction of cement active components in the cement slurry proceeds, the consistency of the cement slurry will increase. When the consistency reaches a certain value, the cement slurry will lose its fluidity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
Inventor 邹建龙朱海金屈建省高永会张清玉谭文礼孙富全
Owner BC P INC CHINA NAT PETROLEUM CORP
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