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Floating-bead-free low-density oil well cement paste

An oil well cement slurry and oil well cement technology, which is applied in the field of oil and gas well cementing, can solve the problems of high price of nano wollastonite, and achieve the effects of stable density, small API filtration loss and improving cementing quality.

Active Publication Date: 2016-01-20
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent has better stability and higher early strength, its nano wollastonite is expensive, and its cement slurry density can only reach 1.60g / cm 3 , cannot fully meet the current requirements of lower density cement slurry for well cementing

Method used

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  • Floating-bead-free low-density oil well cement paste

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Effect test

Embodiment 1

[0032] A kind of floating bead-free oil well cement slurry, including the following raw materials by mass percentage: ordinary portland cement 18%, superfine portland cement 30%, fly ash 22.5%, micro silicon 22%, triethanolamine 3.8% , fluid loss reducer QS12S2.5%, dispersant SXY1.2%.

Embodiment 2

[0034] A kind of oil well cement slurry without drift beads, comprising the following raw materials in terms of mass percentage: 10% of G grade oil well cement, 41.5% of superfine portland cement, 24% of micro silicon, 18% of diatomite, and 4.0% of calcium chloride , fluid loss reducer QS12S1.0%, dispersant SXY1.5%.

Embodiment 3

[0036] A kind of oil well cement slurry without bleaching beads, comprising the following raw materials by mass percentage: 15% of D grade oil well cement, 35% of superfine Portland cement, 20.5% of fly ash, 22% of bentonite, 2% of triethanolamine, chlorine Calcium 2%, fluid loss reducer G60S 3.0%, dispersant QS20S 0.5%.

[0037] The specific surface area of ​​the superfine portland cement of the present embodiment is 1200cm 2 / g.

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Abstract

The invention discloses floating-bead-free low-density oil well cement paste and belongs to the technical field of oil and gas well cementation. The cement paste is prepared from 10-30% of cementing material A, 15-50% of cementing material B, 2-48% of filling material, 1-3% of fluid loss agent, 1-4% of early strength agent and 0.5-1.5% of dispersing agent. The cementing material A is one of G-grade oil well cement, D-grade oil well cement and ordinary Portland cement. The cementing material B is superfine ordinary Portland cement. The cement paste has the advantages of being low in cost, low in density, and high in early strength, density stability and quality stability.

Description

technical field [0001] The invention relates to a low-density oil well cement, in particular to a low-density oil well cement slurry without drift beads, which belongs to the technical field of oil and gas well cementing. Background technique [0002] With the development of the drilling field, the underground pressure system is becoming more and more complex, and the number of special wells such as lost wells and heavy oil wells is increasing. The conventional cement slurry system can no longer meet the cementing requirements of such wells, especially in the high density and water loss. Too large, the early strength development of the system is too slow, and the thickening time is too long. In order to solve this series of special problems, people continue to develop cement slurry systems with different characteristics, such as low-density cement that meets different density requirements. system. The composition of the floating bead shell is very close to that of high alum...

Claims

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Application Information

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IPC IPC(8): C09K8/473C09K8/487
CPCC04B28/04C04B2111/00724C09K8/426C09K8/473C09K8/487C04B14/062C04B18/08C04B24/122C04B2103/46C04B2103/408C04B14/08C04B22/124C04B2103/0035C04B14/104C04B2103/0032C04B22/147C04B2103/002
Inventor 曾雪玲古安林张斌阳运霞
Owner JIAHUA SPECIAL CEMENT
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