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

A technology of oil well cement and high temperature resistance, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unobvious fluctuations, and achieve the effect of simple and easy operation, high success rate, and increased consistency

Inactive Publication Date: 2016-11-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of high temperature resistant oil well cement retarder, the high temperature resistant oil well cement retarder has high temperature resistance characteristics and does not affect its high temperature settlement stability, the consistency of cement slurry is kept around a certain value, without fluctuation Obviously, it has the potential to solve existing engineering construction problems

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1 Preparation of high temperature resistant retarder with itaconic acid as the main retarding monomer

[0032] Weigh out sodium p-styrene sulfonate (SSS), itaconic acid (IA), and N-vinyl caprolactam (NVCL) at a mass ratio of 16:3:1, and dissolve them with deionized water, and pass the concentration to 5mol / L sodium hydroxide solution to adjust the PH value to 5, with 12% solid content as the standard to control the total solution volume.

[0033] Adjust the temperature of the water bath to 60°C, and install the reaction device, which includes three-necked flask, polytetrafluoroethylene stirring rod, separatory funnel and other main components. Transfer the mixed solution of sodium styrene sulfonate (SSS) and itaconic acid (IA) into a three-necked flask, keep the PTFE stirring rod at a speed of (2000±200 rpm), and pour nitrogen into the container to remove oxygen After the temperature rises to the set temperature, use a separating funnel to add N-vinyl caprolactam (...

Embodiment 2

[0035] Example 2 Preparation of high temperature resistant retarder with maleic acid as the main retarding monomer

[0036] Weigh out sodium p-styrene sulfonate (SSS), itaconic acid (IA), and N-vinyl caprolactam (NVCL) in a mass ratio of 13:3:3, dissolve them with deionized water, and pass the concentration to 5mol / L of sodium hydroxide solution to adjust the PH value to 7, with 12% solid content as the standard to control the total solution volume.

[0037] Adjust the temperature of the water bath to 65°C, and install the reaction device, which includes a three-necked flask, a polytetrafluoroethylene stirring rod, a separatory funnel and other main components. Transfer the mixed solution of sodium styrene sulfonate (SSS) and itaconic acid (MA) into a three-necked flask, keep the PTFE stirring rod at (2000±200 rpm), and pour nitrogen into the container to remove oxygen After the temperature rises to the set temperature, use a separatory funnel to add N-vinylcaprolactam (NVCL) and...

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Abstract

The invention discloses a high-temperature-resistant oil-well cement retarder and a preparation method thereof. The cement retarder comprises three structural units of sodium p-styrenesulfonate, maleic acid or itaconic acid, and N-vinylcaprolactam. The preparation method for the cement retarder comprises the following steps: (1) mixing odium p-styrenesulfonate, maleic acid or itaconic acid, and N-vinylcaprolactam according to the mass ratio of 10-17:2-7:1-3, dissolving in deionized water, controlling the total mass concentration of the monomers in the solution to be 10-20%, and adjusting the pH value of the solution to be 4-9; (2) introducing nitrogen into a reactor for removing oxygen, and adding an initiator potassium persulfate into the reaction system after the temperature of the reaction system raises to 55-70 DEG C; and (3) reacting 3-7 h, cooling the yellow slightly-viscous liquid product to room temperature, and performing purification, drying and crushing. The cement retarder possesses high-temperature resistance as well as high-temperature settlement stability, and the preparation method of the cement retarder has reliable principle, is convenient to operate, and possesses wide market prospect.

Description

Technical field [0001] The invention relates to an oil well cement polymer retarder for oil field cementing, which adopts a free radical aqueous solution polymerization method and selects new monomers to copolymerize, and can effectively prolong the thickening time of oil well cement slurry. The invention also relates to a preparation method of the polymer retarder. Background technique [0002] Cementing refers to when the drilling operation reaches a certain well depth, the casing string is inserted into the drilled wellbore, and then cement slurry is injected into the annulus between the casing and the well wall to reach a certain predetermined position and make it within a predetermined time The process of rapidly setting and hardening inside, forming a high-quality, complete cement ring with good interlayer sealing ability. Due to the irreversibility of the process, safe pumping can be completed only when the rheological properties of the cement slurry meet the pumping cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C08F212/14C08F222/02C08F226/06
CPCC09K8/44C08F212/14C08F222/02C08F226/06
Inventor 李明卢娅郭小阳郭子涵张兴国李早元程小伟刘健邓双谢冬柏
Owner SOUTHWEST PETROLEUM UNIV
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