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A kind of cementitious composition, composite cementitious material and cementing fluid

A technology of composite cementitious materials and compositions, which is applied in the field of oil and gas well cementing, can solve the problems of polluting the environment, failing to meet the strength decline of cement stone, and consuming clay, so as to achieve low prices, meet the needs of cementing, and prevent strength decline Effect

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the production of cement consumes a large amount of clay, rock and other materials and energy, and releases a large amount of CO 2 and other harmful gases, polluting the environment
Therefore, at a higher temperature, the requirement of cement stone to resist strength decline cannot be met by adding silica fume.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 24 parts of oil well cement (Jiahua grade G), 30 parts of 400-mesh silica-alumina admixture, 40 parts of calcium siliceous admixture, 4 parts of nano-silica fume with a particle size of 50-300nm, and 2 parts of nano-whiskers , 2-6 parts of anti-high temperature filtrate reducer, 1 part of anti-high temperature dispersant, 0.5 part of anti-high temperature setting retarder, 35-48 parts of water, 0.2 part of defoamer, the density is 1.80-2.00g / cm 3 The cement slurry system was cured at 220°C and 21MPa for 72 hours, and the test compressive strength was 21MPa. After curing for 28 days, the compressive strength was 23MPa.

Embodiment 2

[0059] 20 parts of oil well cement (Jiahua grade G), 20 parts of silica-alumina admixture, 54 parts of calcium siliceous admixture, 4 parts of nano-silica fume with a particle size of 50-300nm, 2 parts of nano-whisker, anti- 2-6 parts of high temperature fluid loss reducer, 1 part of high temperature resistant dispersant, 0.5 part of high temperature resistant setting retarder, 35-48 parts of water, 0.2 part of defoamer, to prepare cementing cement with a density of 1.80-2.00g / cm3 The slurry system was cured at 220°C and 21MPa for 72 hours, and the test compressive strength was 20MPa. After curing for 28 days, the compressive strength was 22MPa.

Embodiment 3

[0061] 20 parts of oil well cement (Jiahua grade G), 30 parts of silica-alumina admixture, 44 parts of calcium siliceous admixture, 4 parts of nano-silica fume with a particle size of 50-300nm, 2 parts of nano-whisker, anti- 2-6 parts of high temperature fluid loss reducer, 1 part of high temperature resistant dispersant, 0.5 part of high temperature resistant setting retarder, 35-48 parts of water, 0.2 part of defoamer, to prepare cementing cement with a density of 1.80-2.00g / cm3 The slurry system was cured for 72 hours at 220°C and 21MPa, and the test compressive strength was 23MPa. After curing for 28 days, the compressive strength was 25MPa.

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PUM

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Abstract

The present invention relates to a cementitious composition, a composite cementitious material and a cementing fluid comprising the cementitious composition. The cementitious composition includes a silica-alumina admixture, a calcium-siliceous admixture, a reinforcing material and a toughening material. The composite cementitious material includes cement and the above-mentioned cementitious composition. The cementing fluid prepared from the composite gelling material has the advantages of good system stability, low filtration water loss and adjustable thickening time. The formed hardened cement stone has high strength at high temperature and long-term resistance to strength decline, and has good application prospects in the field of oil and gas well development with high temperature environment such as ultra-deep wells and thermal recovery wells.

Description

technical field [0001] The invention relates to the field of oil and gas well cementing, in particular to a cementitious composition, a composite cementitious material and a cementing fluid comprising the cementitious composition. Background technique [0002] With the gradual deepening of the exploration and development of oil and gas wells in my country, the number of deep and ultra-deep wells has also increased, and the temperature of the wells has gradually increased, which is currently over 200 °C or even higher. my country has abundant reserves of heavy oil resources, and the exploitation of heavy oil has great potential. In the process of heavy oil recovery, high-temperature steam is injected, and after multiple rounds of high-temperature steam stimulation. In order to prevent the strength decline of ordinary oil well cement stone at high temperature, a certain amount of silica fume is usually mixed into the cement slurry to keep the strength of the cement stone stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/14C04B28/02E21B33/13C09K8/467
CPCC04B40/0039C04B28/026E21B33/13C09K8/467C04B2111/00724C04B2111/00008C04B18/12C04B14/047C04B14/106C04B7/12C04B18/08C04B14/06C04B14/30C04B14/303C04B14/304C04B18/146C04B14/383C04B24/161C04B24/166C04B2103/22Y02W30/91
Inventor 刘仍光丁士东陆沛青高元曾敏李小江
Owner CHINA PETROLEUM & CHEM CORP