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Steel slag-based oil well cement expanding agent and application thereof in oil well cement

The technology of oil well cement and expansion agent is applied to steel slag-based oil well cement expansion agent and its application field in oil well cement, and can solve the problems of function, steel slag expansion agent is difficult to adapt to cementing operation, and its performance cannot meet cementing environment. Achieve the effect of reducing production costs, reducing micro-gap and waste of oil and gas resources, and improving market competitiveness

Active Publication Date: 2022-03-25
BEIJING ZHONGYANYI ENG TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the expansion agent formed by this technical means is used in well cementing operations, the single-generated Ca(OH)2 cannot act on the whole life cycle of oil well cement in a full-time and all-round way, and its performance It cannot meet the cementing environment at high temperature, so the steel slag expansion agent is still difficult to meet the needs of cementing operations

Method used

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  • Steel slag-based oil well cement expanding agent and application thereof in oil well cement
  • Steel slag-based oil well cement expanding agent and application thereof in oil well cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The oil well cement expansion agent in this implementation comprises the following components in parts by weight: 700 parts of steel slag, 100 parts of magnesite, 75 parts of dolomite, and 55 parts of periclase. The steel slag powder, magnesite, dolomite and periclase are mixed according to the above parts by weight and then ground to a specific surface area of ​​260 m 2 / kg, added to G-grade oil well cement at a dosage of 13%, and tested according to the standard "SY / T-5504.8-2013 Oil Well Cement Admixture Evaluation Method-Part 8 Expansion Agent". The results are shown in Table 1.

Embodiment 2

[0036] The oil well cement expansion agent in this implementation comprises the following components in parts by weight: 710 parts of steel slag, 100 parts of magnesite, 100 parts of dolomite, and 50 parts of periclase. The steel slag powder, magnesite, dolomite and periclase are mixed according to the above parts by weight and then ground to a specific surface area of ​​350 m 2 / kg, added to G-grade oil well cement at a dosage of 8%, and tested according to the standard "SY / T-5504.8-2013 Oil Well Cement Admixture Evaluation Method-Part 8 Expansion Agent". The results are shown in Table 1.

Embodiment 3

[0038] The oil well cement expansion agent of this implementation comprises the following components in parts by weight: 710 parts of steel slag, 110 parts of magnesite, 75 parts of dolomite, and 60 parts of periclase. The steel slag powder, magnesite, dolomite, and periclase are mixed according to the above parts by weight and then ground to a specific surface area of ​​300 m 2 / kg, added to grade G oil well cement at a dosage of 5%, and tested according to the standard "SY / T-5504.8-2013 Oil Well Cement Admixture Evaluation Method - Part 8 Expansion Agent". The results are shown in Table 1.

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Abstract

The invention discloses a steel slag-based oil well cement expanding agent and application thereof in oil well cement. Belongs to the technical field of oil field well cementation cement additives, and particularly relates to a steel slag-based oil well cement expanding agent and application thereof in oil well cement. The steel slag-based oil well cement expanding agent prepared by the invention has relatively large restrained expansion rate and relatively high compressive strength. Compared with the prior art, the steel slag-based oil well cement expanding agent disclosed by the invention has the advantages that the solid waste steel slag is efficiently and reasonably utilized, the expansion efficiency of the expanding agent in oil well cement is improved through the stability of magnesium hydroxide, and the micro-gaps of hardened set cement and the waste of oil and gas resources are greatly reduced. Meanwhile, magnesium oxide in the steel slag is turned into wealth, the production cost of the product is reduced, and the market competitiveness of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield cementing additives, and in particular relates to a steel slag-based oilwell cement expansion agent and its application in oilwell cement. Background technique [0002] During the cementing process, the water-cement ratio of the oil well cement slurry is large, and the cementing environment is harsh, generally in a state of high temperature (38-200°C) and high pressure, which makes the shrinkage of the oil well cement slurry very serious. Shrinkage will lead to relatively large micro-gap in the hardened cement stone, and high-pressure oil and gas fluid will escape into the low-pressure area through the micro-gap, resulting in the loss of oil and gas resources and may even lead to cementing failure. The use of oil well cement expansion agent is one of the effective methods to solve the shrinkage of cement paste, and the development of energy-saving, low-carbon, and environmentally friendly oil wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B28/00
CPCC04B40/0039C04B28/00C04B2201/50C04B18/142C04B22/066C04B22/10Y02W30/91
Inventor 姚广王敏文寨军唐官保郭随华黄文张坤悦王晶刘云王显斌高显束余杨马忠诚
Owner BEIJING ZHONGYANYI ENG TECH DEV CENT
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