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Cement paste for fixing well and preparation method thereof

A cement slurry and well cementing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor corrosion performance of calcium aluminate hydrate, no high temperature resistance, strength attenuation, etc. Adjustable chemical time, controllable API water loss, good high temperature resistance

Inactive Publication Date: 2019-03-26
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminate cement is considered to be a commonly used high-temperature cement, but within this temperature range, there is also a phenomenon of strength attenuation. At the same time, the anti-CO2 of calcium aluminate hydrate 2 poor corrosion performance
Phosphate cement has excellent resistance to CO 2 Corrosion performance, but because the cement system does not have high temperature resistance, there will be obvious cracking phenomenon under high temperature conditions

Method used

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  • Cement paste for fixing well and preparation method thereof
  • Cement paste for fixing well and preparation method thereof
  • Cement paste for fixing well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The cement slurry base material in this embodiment includes the following components in parts by weight: 100 parts of aluminate cement, 10 parts of sodium dihydrogen phosphate, 30 parts of calcined α-alumina, 35 parts of white corundum, 10 parts of blast furnace slag, pulverized coal Ash 20 parts.

[0033] The above components were mixed at normal temperature to obtain the cement slurry base material of this embodiment, ready for use.

[0034] The components of the cement slurry in this embodiment include the following components in parts by weight: the cement slurry base material prepared above, 8 parts of fluid loss reducer, 2 parts of retarder, 0.5 part of defoamer, 90 parts of water, The water is tap water provided by the municipal government.

[0035] At normal temperature, the above water loss reducing agent, retarder, defoamer and the water are mixed to form the first mixture; the prepared cement slurry base material is mixed with the first mixture and stirred t...

Embodiment 2

[0038] The cement slurry base material in this embodiment includes the following components in parts by weight: 100 parts of aluminate cement, 15 parts of sodium dihydrogen phosphate, 30 parts of calcined α-alumina, 35 parts of white corundum, 15 parts of blast furnace slag, pulverized coal Ash 15 parts.

[0039] The above components were mixed at normal temperature to obtain the cement slurry base material of this embodiment, ready for use.

[0040] The components of the cement slurry in this embodiment include the following components in parts by weight: the cement slurry base material prepared above, 8 parts of fluid loss reducer, 2 parts of retarder, 0.5 part of defoamer, 90 parts of water, The water is tap water provided by the municipal government.

[0041] At normal temperature, the above water loss reducing agent, retarder, defoamer and the water are mixed to form the first mixture; the prepared cement slurry base material is mixed with the first mixture and stirred t...

Embodiment 3

[0044] The cement slurry base material in this embodiment includes the following components in parts by weight: 100 parts of aluminate cement, 10 parts of sodium dihydrogen phosphate, 30 parts of calcined α-alumina, 35 parts of white corundum, 20 parts of blast furnace slag, pulverized coal Ash 10 parts.

[0045] The above components were mixed at normal temperature to obtain the cement slurry base material of this embodiment, ready for use.

[0046] The components of the cement slurry in this embodiment include the following components in parts by weight: the cement slurry base material prepared above, 8 parts of fluid loss reducer, 2 parts of retarder, 0.5 part of defoamer, 90 parts of water, The water is tap water provided by the municipal government.

[0047]At normal temperature, the above water loss reducing agent, retarder, defoamer and the water are mixed to form the first mixture; the prepared cement slurry base material is mixed with the first mixture and stirred to...

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Abstract

The invention provides cement paste for fixing a well and a preparation method thereof. The cement paste for fixing the well comprises a cement slurry base material, a fluid loss agent, a retarder, adefoamer and water, wherein the fluid loss agent, the retarder, the defoamer and water separately account for 3-4%, 0-2%, 0-0.5% and 40-50% of the weight of the cement slurry base material. The cementpaste has the abilities of being not recessed and resisting CO2 corrosion at a high temperature condition of 550 DEG C, so that the cement paste can guarantee a long-term packing effect in an oil extraction stage of in situ combustion.

Description

technical field [0001] The invention relates to a cement slurry technology for oil and gas well cementing, in particular to a cement slurry for well cementing and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] With the depletion of conventional oil and gas resources, my country's major oil fields have entered the secondary and tertiary oil recovery period. As an unconventional oil resource, heavy oil has great exploitation value. Incineration oil layer recovery technology is a thermal oil recovery method that has developed rapidly in recent years and has obvious technical advantages and potentials. It is one of the technologies to enhance the recovery of heavy oil. Its principle is to use the heavy components in the formation crude oil as fuel , using air or oxygen-enriched gas as a combustion aid, adopting methods such as spontaneous combustion and artificial ignition to make the temperature of the ...

Claims

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Application Information

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IPC IPC(8): C04B28/06C09K8/467C04B111/20
CPCC04B28/06C04B2111/20C04B2201/50C09K8/467C04B22/16C04B14/303C04B18/141C04B18/08C04B2103/22C04B2103/50C04B24/163
Inventor 雍富华杨立军冯义王国涛肖华陈芳徐丽琴鄢畅曾贵蓉王忠华周芝琴尹学源赵业卫张波刘国健
Owner BC P INC CHINA NAT PETROLEUM CORP