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A kind of high performance oil and gas well cement dispersant and preparation method thereof

A cement dispersant and dispersant technology, which is applied in the field of oil and gas well cementing, can solve problems such as unsatisfactory requirements, poor dispersion effect, and adverse effects of cement slurry thickening curve, etc., to reduce costs, improve dispersion efficiency, and uniform products No precipitation effect

Active Publication Date: 2018-02-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This dispersant has the advantages of salt resistance and temperature resistance, but its dispersion performance is not good, especially for high temperature and high pressure cement slurry system.
Polycarboxylate water reducers, which are widely used in concrete, have also begun to be used as dispersants in the field of oil and gas cementing. However, due to the molecular structure of the dispersants, the existing polycarboxylate dispersants have different Retarding effect, high temperature (greater than 110 ℃) will have adverse effects on the thickening curve of cement slurry, and cannot meet the requirements of some low temperature and high temperature and high pressure cementing

Method used

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  • A kind of high performance oil and gas well cement dispersant and preparation method thereof
  • A kind of high performance oil and gas well cement dispersant and preparation method thereof
  • A kind of high performance oil and gas well cement dispersant and preparation method thereof

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Embodiment 1

[0032] The high-performance oil and gas well cement dispersant of the present embodiment is prepared through the following steps:

[0033] a. Mix 222g polyethylene glycol monomethyl ether methacrylate, 44.5g α-methacrylic acid, 33.5g 2-acrylamido-2-methylpropanesulfonic acid and 650g deionized water to obtain 950g aqueous solution A ;

[0034] b. Dissolve 4.5g of sodium persulfate in 45.5g of deionized water to obtain 50g of aqueous solution B;

[0035] c. When the temperature of the reactor is 80°C, add the aqueous solution B dropwise to the aqueous solution A to carry out the polymerization reaction, control the reaction temperature at 80°C, and control the reaction time at 4h;

[0036] d. The reactant is cooled to room temperature, adjusted to pH 7 with NaOH, and discharged to obtain 1000 g of polycarboxylic acid dispersant;

[0037] e. Mix 1000g of this polycarboxylic acid dispersant with 1000g of sulfonated acetone-formaldehyde condensate dispersant evenly for compoundi...

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Abstract

The invention relates to a high-performance cement dispersing agent for an oil gas well. The cement dispersing agent comprises a polycarboxylic dispersing agent and a sulfonated acetone formaldehyde dispersing agent in a weight ratio of 1:(0.1-10). The polycarboxylic dispersing agent and the sulfonated acetone formaldehyde dispersing agent are compounded to obtain a certain synergistic effect and achieve an unexpected technical effect, so that the production cost is effectively lowered, the dispersibility is effectively improved, and the problem that the polycarboxylic dispersing agent coagulated at low temperatures and at high temperatures has an adverse effect on a cement paste thickening curve is solved.

Description

technical field [0001] The application relates to the field of oil and gas well cementing, in particular to a high-performance oil and gas well cement dispersant and its preparation method. Background technique [0002] High-performance oil and gas well cement dispersant refers to the substance that can reduce the mixing water consumption and improve the strength of cement stone under the condition that the rheology of cement slurry and the amount of cementing material remain unchanged; It is a substance that makes the rheological properties of cement slurry better under the condition of constant water consumption. At present, the sulfonated acetone-formaldehyde condensate dispersant is the largest and most widely used cement dispersant for oil and gas wells in my country. This dispersant has the advantages of salt resistance and temperature resistance, but its dispersing performance is not good, especially for high temperature and high pressure cement slurry systems. Poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C08F220/28C08F220/06C08F220/58
Inventor 于斌赵琥孙超张浩宋维凯汪蕾王清顺符军放
Owner CHINA NAT OFFSHORE OIL CORP
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