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Efficient anti-pollution isolation liquid for well cementation and preparation method thereof

A spacer fluid and anti-pollution technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low displacement efficiency of two-phase fluid, poor cement sheath cementation quality, etc., to improve displacement efficiency and avoid ring air Channeling, good chemical compatibility

Active Publication Date: 2012-02-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a high-efficiency anti-pollution spacer fluid for cementing to solve the problems of low efficiency of two-phase fluid contact pollution replacement and poor cement sheath cementation quality in cementing operations. 3 -2.60g / cm 3 The performance is controllable within the range, and the performance is stable in the temperature range of 40°C to 140°C; it has excellent anti-pollution performance, dilutes the drilling fluid and effectively isolates the drilling fluid and cement slurry, prevents contact pollution, and improves the displacement efficiency; Effective abrasion, scraping and displacement of attachments such as mud cake, dry dehydrated gelled and thickened drilling fluid, and improved cementing quality

Method used

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  • Efficient anti-pollution isolation liquid for well cementation and preparation method thereof
  • Efficient anti-pollution isolation liquid for well cementation and preparation method thereof
  • Efficient anti-pollution isolation liquid for well cementation and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] Wet preparation process: put 100 parts of water into the slurry cup, put 8 parts of sodium bentonite, and stir for 3 hours; then put in 0.65 parts of sodium humate, 0.6 parts of hydroxyethyl cellulose, and 0.5 parts of sodium sulfomethyl gallate , 0.1 part of sodium carbonate, stir evenly to adjust the performance to meet the requirements, then add 80 parts of barite powder to the required density; finally add 15 parts of sodium hydroxide to adjust the pH of the liquid between 8 and 11, and finally add 0.1 part of tributyl phosphate Stir for 1 hour to obtain a density of 1.3g / cm 3 High-efficiency anti-pollution spacer fluid for well cementing.

Embodiment 2

[0049] Wet preparation process: put 100 parts of water in the slurry cup, put in 15 parts of polyethylene glycol, and stir for 3 hours; then put in 3 parts of sodium sulfomethylhumate, 1 part of sodium carboxymethyl cellulose, and 2 parts of iron Sodium chromium lignosulfonate, 5 parts of calcium carbonate, stir evenly to adjust the performance to meet the requirements, then add 30 parts of ilmenite powder to the required density; finally add 10 parts of potassium hydroxide to adjust the pH of the spacer between 8 and 11, Finally, add 0.3 parts of phenylethyl alcohol oleate and stir for 1 hour to obtain a density of 1.8g / cm 3 High-efficiency anti-pollution spacer fluid for well cementing.

Embodiment 3

[0051]Dry preparation process: 28 parts of hydroxypropyl starch ether, 4 parts of sulfomethyl phenolic resin, 2 parts of sepiolite, 0.5 part of sodium carbonate, and 240 parts of magnetite powder are dry mixed into a mixed powder according to the weight ratio; Add 5 parts of sodium sulfomethyl gallate, 12 parts of sodium bicarbonate, and 0.2 parts of lauryl phenylacetate into 100 parts of clean water to make the base liquid of the isolation liquid and stir evenly; finally, add the mixed powder into the base liquid of the isolation liquid , stirred for 2 hours to obtain a density of 2.1g / cm 3 High-efficiency anti-pollution spacer fluid for well cementing.

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Abstract

The invention relates to an efficient anti-pollution isolation liquid for well cementation and a preparation method thereof, belonging to the technical field of well cementation. The isolation liquid comprises the following components in parts by weight: 100 parts of clear water, 4-29 parts of suspending stabilizer, 0.5-5 parts of fluid loss additive, 0.3-2 parts of tackifier, 0.1-5 parts of diluting agent, 0-5 parts of viscosity and shearing force increasing agent, 30-350 parts of weighting agent, 1-25 parts of pH value regulating agent and 0.1-0.5 part of defoamer. The isolation liquid provided by the invention has wide density regulation range, large temperature resisting range, strong anti-pollution capacity, wide applicability and strong maneuverability, can be conveniently subjected to in-situ preparation, can be prepared by using a mud tank equipment base fluid method or cement vehicle equipment dry-mixing method, and can apply effective abrasion, scraping and carrying effects to attachments on an interface of a well wall; and by using the isolation liquid, the problems that in the well cementation operation, pollution is generated by fluid displacement, the adhering quality of a well cementation interface is poor and the like are effectively solved.

Description

technical field [0001] The invention relates to a high-efficiency anti-pollution spacer fluid for well cementing and a preparation method thereof, which are used in the technical field of prefluid for petroleum cementing engineering. Background technique [0002] The ultimate purpose of the cementing project is to ensure the quality of the cementing, to ensure the effective sealing and bonding of the cement sheath with the casing and the formation, and to prevent the oil, gas and water between different formations from communicating with each other, so as to ensure the normal production and long-term production life of the oil and gas well. It provides convenience for post-acid fracturing stimulation. [0003] During cementing, the drilling fluid is displaced by cement slurry, and the cement sheath is formed in the annulus to support the casing and seal the formation. The complex situations faced in this process include: [0004] (1) Contact pollution between drilling fluid...

Claims

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Application Information

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IPC IPC(8): C09K8/40
Inventor 郭小阳李早元程小伟刘洋马勇杨香艳李云杰焦少卿刘建李明
Owner SOUTHWEST PETROLEUM UNIV
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