Well cementation oil well cement composition and preparation method thereof

A technology of oil well cement and composition, which is applied in the field of oil well cement composition and its preparation, can solve the problems of easy and rapid decline and aging of cement cement strength, and achieve the effect of enhancing mechanical properties, preventing occurrence and expansion, and good effect

Active Publication Date: 2020-07-03
BAODING BAOXING OIL FIELD CEMENTING MATERIAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an oil well cement composition for well cementing, which is used to solve the problem that the strength of cement stones in well cementing is easy to rapidly decline and age in a high-temperature hydrothermal environment, and at the same time take into account the improvement of cement Excellent impact resistance, enhanced toughness, reduced brittleness, improved rheological properties

Method used

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  • Well cementation oil well cement composition and preparation method thereof
  • Well cementation oil well cement composition and preparation method thereof

Examples

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Embodiment 1

[0062] This embodiment provides an oil well cement composition for well cementing, including parts by mass: 60 parts of clinker, 8 parts of anti-strength recession agent, 4 parts of brittleness reducing and toughening agent, 4 parts of high temperature strengthening agent, 20 parts of BFS, 1.5 parts of dispersant. BFS is composed of the following raw materials by weight percentage: CaO35-45%, SiO 2 30-40%, Al 2 O 3 10-18%, MgO 5-12%, Fe 2 O 3 0.2-1%, MnO 0.2-1%, SO 3 1-5%. The anti-strength decay agent is wollastonite powder, and the brittleness reducing and toughening agent is high elastic modulus PVA fiber, low elastic modulus polypropylene fiber, and calcium sulfate whiskers mixed in a ratio of 1:1:10; the high temperature reinforcing agent is nano SiO 2 Sol (size range 1-100nm); dispersant is APC. Preparation method: ball mill BFS and clinker, and grind it to a specific surface area of ​​about 3000cm 2 / g, after adding other components, mixing again to obtain the oil wel...

Embodiment 2

[0064] In this example, on the basis of example 1, the strength-reducing agent is changed to wollastonite powder and metakaolin mixed in a mass ratio of 1:4. Others are the same as in Example 1.

Embodiment 3

[0066] This embodiment is on the basis of embodiment 1, the brittleness reducing and toughening agent is changed to a composition composed of carbon fiber and waterborne epoxy resin containing curing agent, wherein the mass ratio of carbon fiber and waterborne epoxy resin containing curing agent is 1:5 , And control the content of carbon fiber in the oil well cement composition to 0.2%.

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Abstract

The invention relates to a well cementation oil well cement composition. The oil well cement composition comprises the following components in parts by mass: 50-60 parts of clinker, 5-10 parts of an anti-strength declining agent, 4-8 parts of a brittleness-reducing toughening agent, 2-5 parts of a high-temperature reinforcing agent, 10-20 parts of BFS and 0.5-4 parts of a dispersing agent. The anti-strength declining agent is prepared by mixing wollastonite micro-powder and metakaolin according to a ratio of 1: 4, the brittleness-reducing toughening agent is one or more of high-elastic-modulusPVA fibers, low-elastic-modulus polypropylene fibers, calcium sulfate whiskers, carbon fibers and waterborne epoxy resin containing a curing agent, the high-temperature reinforcing agent is nano SiO2sol, and the dispersing agent is an APC dispersing agent. The invention is used for solving the problem that the strength of the well cementation cement paste is easy to quickly decline and age in ahigh-temperature hydrothermal environment, and can obviously enhance the impact resistance of the cement, enhance the toughness, reduce the brittleness and improve the rheological property of the cement paste.

Description

Technical field [0001] The invention relates to the technical field of special cement, in particular to an oil well cement composition for cementing and a preparation method thereof. Background technique [0002] When extracting oil, the first choice is to drill on the ground at a depth of hundreds of meters to several kilometers, and then insert a steel casing into the well hole. In order to integrate the casing and the formation tightly, the industry has always used oil well cement as the cementing material for cementing construction to support the casing and seal the formation. After that, perforation will be carried out at different depths of oil-bearing geological formations. , In order to achieve oil extraction. Due to different geological conditions, the physical and chemical parameters such as downhole pressure, temperature, underground rock formation acidity and alkalinity, and groundwater vary greatly. Therefore, it is more difficult to ensure that the cementing qualit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/24
CPCC04B28/24C04B2111/00724C04B2201/50C04B7/00C04B14/043C04B14/106C04B16/0641C04B14/383C04B14/386C04B24/281C04B22/064C04B22/06C04B22/066C04B2103/408C04B14/047C04B24/163Y02W30/91
Inventor 李建生
Owner BAODING BAOXING OIL FIELD CEMENTING MATERIAL MFG
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