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Universal oil well cement additive and method

An admixture, oil well technology, applied in chemical instruments and methods, drilling composition, sustainable waste treatment, etc., can solve problems such as poor rheology, poor boundary strength development, etc.

Inactive Publication Date: 2004-05-12
HALLIBURTON ENERGY SERVICES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, such low quality oil and gas well cements often have poor rheology, boundary strength development, or poor responsiveness to conventional admixtures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Cement slurries were prepared with various densities and using various API hydraulic cements, fresh water or brine and various amounts of the admixtures of the present invention. The slurries were tested for thickening time, bleed, rheology (plastic viscosity / yield point), compressive strength and shear adhesion strength at different temperatures. The test was performed according to the method described in "API Specifications for Materials and Testing of Oil Well Cement" ("API Specification 10", 5th Edition, published by American Petroleum Corporation on July 1, 1990).

[0045] The general admixture used in this test consists of 10 parts by weight of ferric chloride, 13 parts by weight of a dispersant made up of the polycondensation product of acetone, formaldehyde and sodium sulfite, 0.4 parts by weight of tartaric acid, 2 parts by weight of hydroxyethyl It consists of cellulose and 8 parts by weight of superfine hydraulic cement with a maximum particle size of about 1...

Embodiment 2

[0049] Cement slurries were prepared with various densities and using various API hydraulic cements, fresh water or brine and varying amounts of another admixture of the present invention. The slurries were tested for thickening time, bleed, rheology (plastic viscosity / yield point), compressive strength and shear adhesion strength at different temperatures. The test was performed according to the method described in "API Specifications for Materials and Testing of Oil Well Cement" ("API Specification 10", 5th Edition, published by American Petroleum Corporation on July 1, 1990).

[0050] The general admixture used in this test is sterilized by 10 parts by weight of ferric chloride, 14 parts by weight of calcium chloride, 0.3 parts by weight of tartaric acid, 12 parts by weight of hydroxyethyl cellulose, and 0.3 parts by weight of polydimethylsiloxane. Foaming agent, 11 parts by weight of dispersant composed of polycondensation products of acetone, formaldehyde and sodium sulfi...

Embodiment 3

[0053] The above test was repeated with 5 cement slurries having two different densities, with or without the universal admixture of the present invention. The results of these tests are listed in Table III.

[0054] As can be seen from Table III, all of the various slurries tested containing the admixture of the present invention have excellent properties and are suitable for oil and gas well gluing applications.

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Abstract

The present invention provides universal well cement additives and methods. The universal well cement additives improve the properties of a well cement slurry and can be comprised of iron chloride, a dispersing agent, an organic acid, a hydratable polymer and an ultra-fine particulate hydraulic cement.

Description

[0001] This application is a divisional application of Chinese patent application 99803313.8 submitted on January 25, 1999. technical field [0002] The present invention generally relates to oil well cement admixtures, and more specifically relates to a general composite admixture for improving the performance of oil well cement slurry. Background technique [0003] Hydraulic cement slurries used to bond subterranean structures or zones in oil or gas wells must have specific properties. For example, cement slurries must have certain properties such that they can be mixed and pumped without premature gelling, have a pumping time long enough to be placed in a subterranean structure or area, and have a high enough compressive resistance after hardening Strength, and has good drain control. [0004] The American Petroleum Corporation (API) has established standards for different types of oil well cements to ensure that the cement slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/12C04B28/04C04B40/00C09K8/46
CPCC04B40/0039C04B22/12C04B28/04C09K8/46Y02W30/91C04B7/02C04B7/527C04B18/146C04B22/124C04B24/06C04B24/166C04B24/383C04B24/42C04B2103/50C04B24/30C04B28/02
Inventor 苏德希尔·梅赫塔威廉·J·卡夫尼理查德·R·琼斯里基·L·摩根丹尼斯·W·格雷吉顿·查特吉
Owner HALLIBURTON ENERGY SERVICES INC