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Low-density cement used for well cementation

A low-density cement and cementing technology, applied in the field of cement, can solve the problems of long thickening time, different thickening time and poor high temperature stability of cement slurry, and achieve constant density, high early strength and high high temperature stability. Effect

Inactive Publication Date: 2018-08-14
宁夏亿昀特种工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these high-temperature, high-pressure and low-density cements still have the problems of poor high-temperature stability and long static gelation time. The cement slurry thickens for a long time, which seriously affects the cementing quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Low-density cement for well cementing, including the following components by mass fraction: high-strength microbeads 5%, floating beads 2%, perlite 2%, oil well G-grade cement 70%, microsilica fume 8%, fly ash 6% , 2% fluid loss reducer, 3% stabilizer, 1% expansion agent, 0.6% early strength agent, 0.4% drag reducer.

[0025] Further, the expansion agent includes the following components in mass fraction: 29% of potassium aluminum silicate, 47% of calcium sulfoaluminate, and 24% of superfine magnesium hydroxide.

[0026] Further, the fluid loss reducer includes the following components in mass fraction: 27% of 2-acrylamide, 39% of 2-methylpropanesulfonic acid, 7% of ammonium persulfate, 9% of sodium bisulfite, sodium hydroxide 5%, N, N-methylenebisacrylamide 13%.

[0027] Further, the early strength agent includes the following components in mass fractions: 21% potassium carbonate, 18% polyaluminum chloride, 48% sodium silicate, and 13% calcium silicate.

[0028] Furt...

Embodiment 2

[0031] Low-density cement for well cementing, including the following components by mass fraction: 7% high-strength microbeads, 5% floating beads, 3% perlite, 65% oil well G-grade cement, 10% silica fume, and 3% fly ash , 2% fluid loss reducer, 3% stabilizer, 1% expansion agent, 0.7% early strength agent, 0.3% drag reducer.

[0032] The components and contents of the expansion agent, fluid loss reducer, early strength agent, stabilizer, and drag reducer are the same as those in Example 1.

Embodiment 3

[0034] Low-density cement for well cementing, including the following components by mass fraction: high-strength microbeads 8%, floating beads 7%, perlite 3%, oil well G-grade cement 55%, microsilica fume 12%, fly ash 8% , fluid loss reducer 2%, stabilizer 3%, expansion agent 1%, early strength agent 0.75%, drag reducer 0.25%.

[0035] The components and contents of the expansion agent, fluid loss reducer, early strength agent, stabilizer, and drag reducer are the same as those in Example 1.

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Abstract

The invention provides low-density cement used for well cementation. The low-density cement comprises the following components in percentages by mass: 5%-8% of high-strength microbeads, 2%-7% of floating beads, 2%-3% of perlite, 55%-70% of oil wells G-grade cement, 8%-12% of silica fume, 3%-9% of fly ash, 2% of a fluid loss agent, 2%-3% of a stabilizer, 1% of an expanding agent, 0.6%-0.75% of an early strength agent, and 0.25%-0.4% of a drag reducer. The low-density cement slurry used for the well cementation provided by the invention has high high-temperature stability, a constant high-pressure density and high early strength, has higher plastic viscosity, dynamic shearing force and thixotropy at high temperature, and is suitable for a well cementing process of high-yield oil wells, gas wells, deep wells, ultra-deep wells, horizontal wells and other wells with higher requirements.

Description

technical field [0001] The invention relates to a cement used in the technical field of drilling and cementing in oil fields, in particular to a low-density cement for well cementing. Background technique [0002] Cementing is a very important part of the drilling process. The quality of cementing directly affects whether oil and gas wells can produce oil and gas safely and efficiently. Cementing is the process of injecting cement into the annulus between the well wall and casing. The main purpose of the well is to seal off the underground oil and gas layers and water layers, prevent the upper and lower collusion, and establish a long-term, stable and safe channel for oil and gas production. At present, cementing mainly adopts high-density cement slurry system (oil well cement mud) and low-density cement slurry system for well cementing. Due to the high temperature and pressure at the bottom of deep wells and the high risk of cementing in the cementing of low-density cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467
CPCC04B28/00C04B2111/00724C04B2201/10C04B2201/20C04B2201/50C09K8/467C04B20/0016C04B18/082C04B14/18C04B18/08C04B18/146C04B22/00C04B22/142C04B22/066C04B22/10C04B22/12C04B12/04C04B22/148C04B24/008C04B22/062C04B24/122C04B24/16C04B24/124C04B22/14
Inventor 蒋颛杰
Owner 宁夏亿昀特种工程材料有限公司
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