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Low hydration heat and low density cement paste system for well cementation and preparation method and application thereof
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A low-heat of hydration, low-density technology used in chemical instruments and methods, solid waste management, earth-moving drilling, etc.
Active Publication Date: 2021-04-30
BC P INC CHINA NAT PETROLEUM CORP +1
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[0006] The second object of the present invention is to provide a low-heat of hydration low-density cement slurry system comprising the above-mentioned low-heat Portland cement, which solves the defects of the existing low-density cement slurry system, reduces the amount of admixture, and improves Oil and gas well cementing quality and production benefit
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[0065] 3. On the basis of above research result, the present invention further provides a kind of preparation method of low heat of hydration low density cement slurry system for well cementing, comprising the following steps:
[0066] S1. Weigh raw materials according to the following parts by weight: 60-70 parts of low-heat Portland cement, 30-40 parts of composite lightening material, 2-3 parts of fluid loss reducer, 0-0.15 parts of retarder, 0 parts of reinforcing agent ~1.5 parts, 70~85 parts of water;
[0067] S2. Under normal temperature conditions, mix the low-heat Portland cement weighed in S1, composite lightening material, fluid loss reducing agent, retarder and reinforcing agent evenly to obtain mixed dry ash;
[0068] S3. Pour 70-85 parts of water into the mixing cup of the constant-speed agitator, turn on the constant-speed agitator, and pour the mixed dry ash obtained in S2 evenly within 0-15 seconds at a speed of 4000 rpm into the rotating slurry cup and conti...
Embodiment 1
[0076] This embodiment provides a cement slurry system with low heat of hydration and low density for well cementing, the formula of which is:
[0077]
[0078]
[0079] In the control group, the same amount of high-resistance G-grade oil well cement was used to replace the low-heat Portland cement, and the remaining components and dosage remained unchanged.
[0080] The experimental data of the low-heat-of-hydration low-density cement slurry system obtained in this embodiment are shown in Table 4 below:
[0081] Table 4 Density is 1.26g / cm 3 Experimental performance of low heat of hydration low density cement slurry system for well cementing
[0082]
Embodiment 2
[0084] This embodiment provides a cement slurry system with low heat of hydration and low density for well cementing, the formula of which is:
[0085]
[0086] In the control group, the same amount of high-resistance G-grade oil well cement was used to replace the low-heat Portland cement, and the remaining components and dosage remained unchanged.
[0087] The experimental data of the low-heat-of-hydration low-density cement slurry system obtained in this embodiment are shown in Table 5 below:
[0088] Table 5 Density is 1.31g / cm 3 Experimental performance of low heat of hydration low density cement slurry system for well cementing
[0089]
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Abstract
The invention provides a low hydration heat and low densitycement paste system for well cementation, and a preparation method and application thereof, the low hydration heat and low densitycement paste system comprises the following components by weight: 60-70 parts of low heat portland cement; 30-40 parts of a composite lightening material; 2-3 parts of a fluid loss agent; 0 to 0.15 part of retarder; 0-1.5 parts of a reinforcing agent; and 70-85 parts of water. The low-hydration-heat and low-density cement paste system prepared by the invention has a wide temperature application range of 40-85 DEG C and a moderate density application range of 1.25-1.45 g / cm < 3 >; and compared with a G-grade cement low-density system under the same condition, the thickening time is longer (40-80 min is prolonged), and the solidification strength is higher (15-30% is improved) for 24 / 48 h. Meanwhile, the performance of a formula system is adjusted, a reasonable one-way adjustment space is reserved, the contradiction and problem that a retarder and a reinforcing agent are used at the same time in an existing system are solved, and meanwhile, the use amount of additives is greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of well cementing, and in particular relates to a cement slurry system with low heat of hydration and low density for well cementing, a preparation method and application thereof. Background technique [0002] Well cementing construction is to inject cement slurry between the formation and casing in the wellbore. After the cement slurry solidifies, it plays the role of separating formations with different pressures and supporting and protecting the casing; good cementing quality is to ensure the life of oil and gas wells. , one of the key technologies for enhancing oil recovery and rationally developing oil and gas fields. With the advancement of drilling technology, more and more deep wells, ultra-deep wells, special wells and difficult wells have been encountered in cementing. In order to solve a series of special problems, various special cement slurry systems for cementing have been created continuously....
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