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Well cementation cement slurry composition and well cementation cement slurry

A technology of cementing slurry and composition, applied in the field of cementing slurry composition and cementing slurry, which can solve the problems of poor durability and low compressive strength, and achieve low compressive strength and excellent high temperature resistance Effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a cement slurry composition, which effectively solves the problem of low compressive strength of the existing sanding oil well cement system at ultra-high temperature by adding microcrystalline quartz to the composition. poor durability

Method used

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  • Well cementation cement slurry composition and well cementation cement slurry
  • Well cementation cement slurry composition and well cementation cement slurry
  • Well cementation cement slurry composition and well cementation cement slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The mass ratio of ultra-high temperature resistant cementing slurry in this embodiment is: 90% of oil well cement, 10% of microcrystalline quartz, and the defoamer accounts for 1‰ of the mass of oil well cement and microcrystalline quartz.

[0058] Pour the powder into the pulp cup, place the pulp cup on a corrugated mixer, pour water into the pulp cup and drop 2-10 drops of defoamer. Press the low-speed stirring button to stir for 15 seconds, then start the high-speed stirring button for 35 seconds and stop. Test the fluidity and density of the slurry, then pour the slurry into a Φ25.4×25.4mm steel cylindrical mold coated with butter to form, and put it in a constant temperature water bath curing box at 80°C for curing until the final setting for 2 hours After demoulding, continue to maintain to the specified age (1d, 7d) before testing. Some samples were cultured in water at 80°C for 7 days and then cured under high temperature and high pressure. After curing to the ...

Embodiment 2

[0061] In this embodiment, the mass ratio of the ultra-high temperature resistant cementing slurry is: 65% of oil well cement, 35% of microcrystalline quartz, and the defoamer accounts for 1‰ of the mass of oil well cement and microcrystalline quartz.

[0062] Pour the powder into the pulp cup, place the pulp cup on a corrugated mixer, pour water into the pulp cup and drop 2-10 drops of defoamer. Press the low-speed stirring button to stir for 15 seconds, then start the high-speed stirring button for 35 seconds and stop. Test the fluidity and density of the slurry, then pour the slurry into a Φ25.4×25.4mm steel cylindrical mold coated with butter to form, and put it in a constant temperature water bath curing box at 80°C for curing until the final setting for 2 hours After demoulding, continue to maintain to the specified age (1d, 7d) before testing. Some samples were cultured in water at 80°C for 7 days and then cured under high temperature and high pressure. After curing to...

Embodiment 3

[0065] In this embodiment, the mass ratio of the ultra-high temperature resistant cementing slurry is: 50% of oil well cement, 50% of microcrystalline quartz, and the defoamer accounts for 1‰ of the mass of oil well cement and microcrystalline quartz.

[0066] Pour the powder into the pulp cup, place the pulp cup on a corrugated mixer, pour water into the pulp cup and drop 2-10 drops of defoamer. Press the low-speed stirring button to stir for 15 seconds, then start the high-speed stirring button for 35 seconds and stop. Test the fluidity and density of the slurry, then pour the slurry into a Φ25.4×25.4mm steel cylindrical mold coated with butter to form, and put it in a constant temperature water bath curing box at 80°C for curing until the final setting for 2 hours After demoulding, continue to maintain to the specified age (1d, 7d) before testing. Some samples were cultured in water at 80°C for 7 days and then cured under high temperature and high pressure. After curing to...

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Abstract

The invention provides a well cementation cement slurry composition and well cementation cement slurry. The well cementation cement slurry composition comprises oil well cement and microcrystalline quartz. The well cementation cement slurry comprises the well cementation cement slurry composition and an optional treatment agent for well cementation. When the well cementation cement paste is applied to a steam injection well or other high-temperature and high-pressure deep wells in heavy oil thermal recovery, set cement has excellent high-temperature resistance under early-stage maintenance (80 DEG C * 7d, 0.1 MPa) and ultrahigh temperature and high pressure (350 DEG C * 90d, 21MPa). The problems of low compressive strength, poor durability and the like of an existing sand-adding oil well cement system at ultrahigh temperature can be solved. In addition, the microcrystalline quartz provides a new thought for research and development of the cement-based high-temperature well cementation material.

Description

technical field [0001] The invention belongs to the technical field of well cementing, and in particular relates to a cementing cement slurry composition and well cementing slurry. Background technique [0002] With the increasing shortage of conventional oil and gas field resources, oil production is developing towards high-temperature wells such as heavy oil thermal recovery wells. [0003] Heavy oil wells are generally cemented at low temperature and run at high temperature. During production, the downhole casing and cement sheath must withstand high temperatures above 300°C. The working conditions are complex and the temperature and stress fields in the well vary greatly. Although the logging quality was high after the cementing construction, the high-temperature strength of the cement sheath deteriorated severely after the steam injection was put into production, the hydraulic seal failed quickly, the durability of the cement sheath was poor, and the casing damage rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/467C09K8/487C04B28/00
CPCC09K8/46C09K8/467C09K8/487C04B28/00C04B2201/20C04B2201/50C04B14/06C04B2103/50C04B2103/0068
Inventor 周仕明姚晓汪晓静苗霞初永涛
Owner CHINA PETROLEUM & CHEM CORP