High-temperature retarder for well cementation and preparation method thereof

A retarder, high temperature technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems affecting the water loss performance of cement slurry, thermal dilution and sedimentation of the slurry, etc., and achieves weak dehydration effect at high temperature. , The effect of inhibiting cement hydration and excellent temperature resistance

Active Publication Date: 2020-10-27
北京普斯维斯石油技术有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Tiemeyer C et al. synthesized the copolymer of AMPS / IA by free radical copolymerization in aqueous solution. The copolymer has good retarding properties for cement at 200 °C, and studied the retarding mechanism of the retarder under high temperature conditions. It is found that it has obvious dispersing effect on cement and affects the water loss performance of cement slurry
The combination of AMPS polymer retarder and organic reinforcing agent (such as tartaric acid, gluconic acid or citric acid) can effectively delay the setting time of cement, but at high temperature and high pressure, the reinforcing agent will cause thermal dilution and sedimentation of the mud due to its high dispersion

Method used

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  • High-temperature retarder for well cementation and preparation method thereof
  • High-temperature retarder for well cementation and preparation method thereof
  • High-temperature retarder for well cementation and preparation method thereof

Examples

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preparation example Construction

[0036] A preparation method of high-temperature retarder for well cementing, comprising the following steps:

[0037] Step 1: Dissolving polymerized monomers in water to form solution A, adjusting the pH to 5.0-7.0;

[0038] Step 2: adding a molecular weight regulator to solution A in step 1 to form solution B;

[0039] Step 3: adding solution B in step 2 to initiator polymerization;

[0040] Step 4: Adjust the pH to 9.5-10.5, hydrolyze and cool down to obtain the required retarder.

[0041] The added mass of the molecular weight regulator accounts for 0.2-3.0%, preferably 0.8-2.0%, of the polymerized monomer mass; the added mass of the initiator accounts for 0.5-2.5%, preferably 0.8-1.2% of the polymerized monomer mass.

[0042] The polymerization temperature in step 3 is 50-70°C, and the polymerization time is 4-8h; the preferred polymerization temperature is 60-65°C, and the polymerization time is 5-6h; during the polymerization, keep the pH at 5.0-7.0. The hydrolysis te...

Embodiment 1

[0054] A preparation method of high-temperature retarder for well cementing, comprising the following steps:

[0055] Step 1: Dissolve 9.00 g of N,N-dimethylacrylamide, 9.00 g of sodium allylsulfonate, and 12.00 g of 3-allyloxy-1,2-propanediol in 260.00 g of deionized water. Adjust the pH of the system to 6.5.

[0056] Step 2: Add 0.6000g PEG200 and stir evenly, then transfer the solution to a 500mL three-necked flask;

[0057] Step 3: Warm up to 60°C under 100r / min stirring condition, dissolve 0.6000g ammonium persulfate with 10.00g deionized water; drop it into a three-necked flask within 2min, and continue to react at 60°C for 4h after the dropwise addition is completed.

[0058] Step 4: Adjust the pH to 10.0, raise the temperature to 90° C., continue stirring for 1 hour, and cool down to room temperature to prepare a retarder.

Embodiment 2

[0060] A preparation method of high-temperature retarder for well cementing, comprising the following steps:

[0061] Step 1: 6.00 g of N,N-dimethylacrylamide, 12.00 g of sodium methacrylate, and 12.00 g of 2-(allyloxy)ethanol were dissolved in 335.00 g of deionized water. Adjust the pH of the system to 5.0.

[0062] Step 2: Add 0.5001g PEG400 and stir evenly, then transfer the solution to a 500mL three-neck flask;

[0063] Step 3: Warm up to 50°C under stirring at 100r / min, and dissolve 0.4500g of ammonium persulfate in 10.00g of deionized water; drop it into a three-necked flask within 2min, and continue the reaction at 50°C for 6h after the addition is completed.

[0064] Step 4: adjust the pH to 9.5, raise the temperature to 85°C, continue to stir for 1 hour, and cool down to room temperature to prepare the retarder.

[0065] The effects of the retarder prepared in this example on rheology, water loss and strength were studied

[0066] The cement slurry was prepared acc...

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Abstract

The invention discloses a high-temperature retarder for well cementation and a preparation method thereof. The retarder comprises a polymeric monomer, and the required retarder can be obtained throughpolymerization and hydrolysis of an aqueous solution of the polymeric monomer. The polymeric monomer comprises the following components in percentage by mass: 20-40% of a nonionic amide monomer, 20-40% of an anionic sulfonic acid monomer and 30-50% of a functional monomer; the retarder disclosed by the invention is controllable in retarding, adjustable in retarding time within the range of 90-240DEG C for 2-12 hours and excellent in temperature resistance, and the highest temperature resistance can reach 240 DEG C; the salt resistance is excellent, and the rheological property, the stability, the water loss and the strength of a well cementation cement paste system are not influenced.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a high-temperature retarder for well cementing and a preparation method thereof. Background technique [0002] With the continuous growth of energy demand and the deepening of oilfield exploration and development, high-temperature deep wells and ultra-deep wells have gradually become the focus of exploration and development. Due to the high reservoir temperature in deep and ultra-deep wells, the control of cementing slurry thickening time becomes the key to cementing operations. [0003] For deep and ultra-deep well long seal cementing operations, in order to meet the cementing requirements under high circulation temperature, a large amount of high temperature retarder needs to be added to the cement slurry. Although the high temperature resistance of the retarder has been greatly improved at this stage, there are still problems such as unstable retarding effect at high tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F220/54C08F228/02C08F8/12C09K8/467
CPCC08F8/12C08F216/1416C08F228/02C08F220/54C09K8/467
Inventor 侯向前邱燮和吴瑜李明辉代超玉蔡亚锋赵继伟尹海燕阿尔祖古丽·麦木提敏
Owner 北京普斯维斯石油技术有限责任公司
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