Cement composition and process therewith

A composition and polymer technology, applied in drilling equipment, etc., can solve problems such as unsuitable strength properties, uncontrollable curing rate, and contamination of surrounding formations

Inactive Publication Date: 2002-02-06
PHILLIPS PETROLEUM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many difficulties are involved with this type of uncontrolled fluid loss, such as uncontrolled solidifica...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0006] According to a first embodiment of the present invention, a composition useful in the oil field is provided. The composition comprises, consists essentially of, or consists of cement, a liquid, and a liquid loss controlling amount of a polymer. The polymer typically comprises repeating units derived from a first unsaturated amide, a hydroxyacrylate, and a combination of monomers selected from the group consisting of: (1) vinylpyridine or a derivative thereof and acrylic acid or a salt thereof; (2 ) vinylmorpholine and a second unsaturated amide; (3) acrylic acid or its salt and a second unsaturated amide; (4) acrylic acid or its salt, vinylpyridine and vinylmorpholine; and two or more of the A combination of the above monomer combinations, wherein the first unsaturated amide is different from the second unsaturated amide, and wherein optionally the polymer further comprises a group selected from the group consisting of acrylonitrile, methacrylonitrile, vinyl acetate es...

no. 2 approach

[0008] According to a second embodiment of the present invention there is provided a method comprising introducing the composition disclosed in the first embodiment into an underground formation. Detailed description of the invention

[0009] As used herein, the term "liquid" refers to water, a solution, a suspension, or a combination thereof, wherein the suspension contains dissolved, partially dissolved, or undissolved substances such as salts. Preferred liquids of the invention are aqueous liquids such as fresh water, sea water, or brine. Examples of salts include metal salts. In general the total salt content can vary widely, eg from 1 to as high as 37.2% by weight based on water. A typical brine has a salt content of, for example, from about 10 to about 37.2% by weight, based on the amount of water.

[0010] The term "controlling fluid loss" is synonymous with "preventing fluid loss".

[0011] According to the first embodiment of the present invention, the additive is...

Embodiment 1

[0031] Preparation of 10 VP / 10 NaAC / 80 AM Polymer

[0032] All monomer ratios used in this example and in the following polymerization examples are mole percent. Polymerizations were carried out in a 1 liter jacketed resin flask equipped with a thermocouple, nitrogen sparger, reflux condenser with oil sparger and mechanical stirrer with stainless steel axial flow propeller. The jacket water temperature was maintained at 60°C. Polymerization was carried out in deionized water at a solids loading of 20 wt%. 0.05 PHM (parts per 100 parts of monomer) tetrasodium ethylenediaminetetraacetic acid (EDTA) was added to chelate the metals present. Sodium persulfate at a ratio of 0.3 PHM (parts per hundred monomers) was used to initiate polymerization. All monomers were commercially available and used as received.

[0033] Into the reactor: 289g deionized water, 0.050g EDTA, 13.7g 4-vinylpyridine (VP, Reilly Industries), 49g 25 wt% sodium acrylate solution (NaAC, neutralize...

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PUM

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Abstract

A composition comprising a polymer which comprises repeat units derived from a first unsaturated amide, a hydroxy acrylate, and at least two monomers selected from the group consisting of (1) a vinyl pyridine or derivative thereof and acrylic acid or salt thereof; (2) a vinyl morpholine and a second unsaturated amide; (3) acrylic acid or salt thereof and a second unsaturated amide; (4) acrylic acid or salt thereof, a vinyl pyridine, and a vinyl morpholine; and combination of two or more thereof wherein said first unsaturated amide is not the same as said second unsaturated amide.

Description

field of invention [0001] The present invention relates to polymer compositions useful as cement additives, cement compositions, and methods of using the cement compositions. Background of the invention [0002] Cementitious compositions are used in the oil and gas industry to cement the annulus in a wellbore between the surrounding form and the pipe or casing. The cement slurry is usually pumped down into the casing and back out of the casing through the annulus. The amount of water used to form the cement paste varies according to the type of hydraulic cement selected and the surrounding operating conditions. The amount of water used can vary widely, depending on factors such as the desired consistency of the slurry, the necessary density to control the forming pressure, and the strength requirements of the particular job. [0003] Hydraulic cement must be placed in or next to a porous medium, such as a ground formation, in the well being drilled. When this occurs, wate...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F220/56
CPCC04B24/2652C04B24/2641C08F220/56C04B24/2688
Inventor H·F·艾夫纳M·斯蒂芬斯
Owner PHILLIPS PETROLEUM CO
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