High-temperature-resistant copolymer oil well cement retarder and preparation method thereof

An oil well cement and copolymer technology, which is applied in chemical instruments and methods, drilling compositions and other directions, can solve the influence of the thickening performance of cement slurry on the development of low temperature strength of cement stone, the stability of cement slurry has a great influence, and the high temperature of cement slurry can be solved. It can solve the problems of poor stability and performance, and achieve the effect of solving serious settlement at high temperature, good compatibility and compatibility, and rapid strength development.

Active Publication Date: 2015-03-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Such as CN101402849A (a kind of oil and gas well cementing high temperature retarder and preparation method thereof) discloses a kind of binary copolymer of 2-acrylamido-2-methylpropanesulfonic acid and itaconic acid, can withstand 200 ℃, but Its synthesis process is complex, using N,N-dimethylpropionamide as the mother liquid, which pollutes the environment, and abnormal gelation phenomena such as "cored" and "bulging" occur in the cement slurry during the thickening process at 180 °C, which will affect well cementing Cement Slurry Performance, Possessing Cementing Risks
CN101967371A (high temperature resistant oil well cement retarder and preparation method thereof) discloses 2-acrylamide-2-methylpropanesulfonic acid, itaconic acid, acrylamide and N,N-dimethylpropylacrylamide Quaternary copolymer retarder, which can withstand high temperature of 180°C, is suitable for long sealing section and large temperature difference cementing, but this retarder is not suitable for deep well or ultra-deep well cementing operations with higher bottom hole circulation temperature , and the thickening time of cement slurry has a serious "upside down" phenomenon with temperature, which increases the risk of cementing
In addition, the 2-acrylamido-2-methylpropanesulfonic acid, dicarboxylic acid and acrylic acid terpolymer retarders developed by domestic researchers can withstand temperatures up to 200°C, but because their molecular structures contain a large number of strong dispersive groups group (such as -SO 3 - , carboxylic acid groups, etc.), so that the polymer has strong dilution and dispersibility at high temperatures, resulting in poor high-temperature stability of the cement slurry, affecting the bonding quality of the first and second interfaces, and thus prone to oil-gas-water channeling. Affect the cementing quality
[0004] The prior art represented by the above-mentioned patent documents has made great progress in the temperature resistance of the polymer retarder, but the prior art has a great influence on the stability of the cement slurry above 130°C, and some of the retarded The agent has a great influence on the thickening performance of cement slurry and the development of low temperature strength of cement stone.

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  • High-temperature-resistant copolymer oil well cement retarder and preparation method thereof
  • High-temperature-resistant copolymer oil well cement retarder and preparation method thereof
  • High-temperature-resistant copolymer oil well cement retarder and preparation method thereof

Examples

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Embodiment 1

[0033] The present embodiment provides a kind of preparation method of high temperature resistant copolymer oil well cement retarder, comprises the following steps:

[0034] Weigh 105g of 2-acrylamido-2-methylpropanesulfonic acid, 7.5g of dimethyl diallyl ammonium chloride, and 15g of maleic anhydride, dissolve them in 350g of deionized water, and then transfer them to a , a thermometer, a constant pressure titration funnel, and a four-neck flask with nitrogen inlet, heat and stir and feed nitrogen to fully dissolve the raw materials;

[0035] Add 0.15g sodium polyphosphate and 0.15g diphenylamino urea to the solution system during the process of heating and stirring to dissolve completely;

[0036] When the temperature of the solution rises to 60°C (this temperature is the reaction temperature), 3.0g of isopropanol is added thereto and stirred at 250r / min for 20min, then slowly added dropwise 10g of azobisisobutylimidazoline salt with a mass concentration of 30% Salt initiat...

Embodiment 2

[0043]This example provides a method for preparing a high-temperature-resistant copolymer oil well cement retarder, the steps of which are basically the same as in Example 1, except that the amount of 2-acrylamido-2-methylpropanesulfonic acid is 90g , the amount of dimethyl diallyl ammonium chloride is 24g, the amount of maleic anhydride is 22.5g, the amount of acrylic acid is 13.5g, the chain transfer agent is changed to hypophosphorous acid, and the apparent viscosity of the obtained copolymer retarder is 1120mPa ·s, the relative molecular weight is 30350.

Embodiment 3

[0045] This example provides a method for preparing a high-temperature-resistant copolymer oil well cement retarder, the steps of which are basically the same as in Example 1, except that the reaction temperature is adjusted from 60°C to 55°C, and azobisisobuimidazole The morphine hydrochloride solution was replaced by ammonium persulfate solution in an amount of 15 g. After reflux at 85°C for 7 hours, the obtained copolymer retarder was recorded as sample 3, with an apparent viscosity of 850 mPa·s and a relative molecular weight of 38540.

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Abstract

The invention relates to a high-temperature-resistant copolymer oil well cement retarder and a preparation method thereof. The preparation method comprises: respectively weighing four polymerization monomers such as 2-acrylamide-2-methylpropanesulfonic acid, diallyldimethylammonium chloride, maleic anhydride or itaconic acid or fumaric acid, and acrylic acid or methacrylic acid according to the mass ratio of 45-80:5-17:7-18:8-20, dissolving the first three monomers in water, then adding sodium polyphosphate and diphenylcarbazide, then successively adding a chain transfer reagent and an initiator, and finally dropwise adding the forth monomer, performing heating reaction and adjusting the pH value, so as to obtain the copolymer retarder. The invention also provides the high-temperature-resistant copolymer oil well cement retarder prepared by the above preparation method. The retarder is resistant to a high temperature up to 230 DEG C and is weak in dispersibility at a high temperature, the cement paste strength develops fast at a low temperature, the addition amount of the retarder has good linear relation with the cement paste hardening time, and the cement paste comprehensive performance is good.

Description

technical field [0001] The invention relates to a high-temperature-resistant copolymer oil well cement retarder and a preparation method thereof, belonging to the technical field of cement retarders. Background technique [0002] With the development of oilfield exploration and development toward deep wells, ultra-deep wells and complex wells, the temperature and pressure at the bottom of the well continue to rise, which brings many difficulties and challenges to cementing engineering. Therefore, in order to meet the special requirements for cementing slurry in high-temperature oil and gas well cementing projects, prevent rapid thickening and condensation of cement slurry during pumping in deep wells and ultra-deep wells, and ensure safe and smooth construction, it is necessary to A certain amount of retarder is added to the cement slurry to improve the thickening and rheological properties of the cement slurry under high temperature and high pressure. [0003] The prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F226/02C08F220/06C08F222/06C08F222/02C08F2/38C09K8/467
Inventor 于永金夏修建刘硕琼靳建洲齐奉忠袁进平徐明冯宇思
Owner BC P INC CHINA NAT PETROLEUM CORP
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