Deepwater well cementing mortar architecture

A technology for cementing cement slurry and cement slurry, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem of difficulty in obtaining anti-channeling ability and early strength, affecting the cementing interface quality of cementing, and cementing channeling. High risk problems, to achieve the effect of adjustable density and thickening time, preventing shallow water-gas channeling problems, and reducing cementing waiting time

Inactive Publication Date: 2008-03-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Irregular well diameters, large annular gaps and narrow density "windows" in deep water surface sections make it difficult to remove mud cake, and cementing tends to take on a "sandwich" structure, which seriously affects the cementation quality of the cementing interface
[2] There is a risk of channeling
[3] The combination of shallow water-air flow, low tempe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100 parts of cement (the cement components are tricalcium silicate 42.27%, calcium sulfoaluminate 15.10%, dicalcium silicate 19.04%, gypsum 6.20%, and the rest are tetracalcium aluminoferrite, calcium carbonate and other trace elements), hollow 60 parts of microbeads, 2.2 parts of hydroxyethyl cellulose fluid loss reducer, 0.6 parts of sulfonated formaldehyde-acetone polycondensate dispersant, 3.5 parts of early strength agent, 0.5 part of retarder, 90 parts of water. The experimental results are shown in Table 1.

Embodiment 2

[0030] 100 parts of cement (the cement components are tricalcium silicate 32.10%, calcium sulfoaluminate 20.73%, dicalcium silicate 21.38%, gypsum 8.05%, and the rest are tetracalcium aluminoferrite, calcium carbonate and other trace elements), hollow 60 parts of microbeads, 2.2 parts of hydroxyethyl cellulose fluid loss reducer, 0.6 parts of sulfonated formaldehyde-acetone polycondensate dispersant, 3.5 parts of early strength agent, 0.5 part of retarder, 90 parts of water. The experimental results are shown in Table 1.

Embodiment 3

[0032] 100 parts of cement (the cement components are tricalcium silicate 42.27%, calcium sulfoaluminate 15.10%, dicalcium silicate 19.04%, gypsum 6.20%, and the rest are tetracalcium aluminoferrite, calcium carbonate and other trace elements), hollow 40 parts of microbeads, 2.0 parts of carboxymethyl hydroxyethyl cellulose fluid loss reducer, 0.6 parts of amino acid sulfonated formaldehyde-acetone polycondensate dispersant, 3.3 parts of early strength agent, 0.5 part of retarder, and 80 parts of water. The experimental results are shown in Table 1.

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PUM

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Abstract

The present invention provides one kind of cement slurry system for deep water well cementing. The cement slurry system consists of silicate-sulfoaluminate composite cement 100 weight portions, hollow bead 0-100 weight portions, water loss reducing agent of hydroxyethyl cellulose or carboxymethyl hydroxyethyl cellulose 1.5-3.0 weight portions, dispersant of sulfonated formaldehyde-acetone polycondensate or sulfonated formaldehyde amidate-acetone polycondensate 0.3-1.0 weight portion, early strength agent of inorganic salts 2.0-4.5 weight portions, setting retarder of low molecular organic acids 0.1-1.2 weight portions, and water 60-120 weight portions. It has excellent low temperature early strength and 'rectangular thickening' performance, and possesses broad application foreground in deep water well cementing.

Description

technical field [0001] The invention relates to a deep-water well cementing cement slurry system, which is particularly suitable for low-temperature, shallow water-gas channeling flow cementing operations under deep-water conditions. Background technique [0002] Deep water refers to sea areas with a water depth of 500-1500m. In recent decades, the total number of large oil fields discovered worldwide has shown a downward trend, but the discovery rate of large deep-water oil fields has increased rapidly. Among the 58 major oil and gas discoveries in the decade from 1990 to 1999, about 1 / 3 were In deep waters. In recent years, deep-water oil and gas discoveries accounted for 40% of the total oil and gas discoveries in the world, especially in 2002-2003, it rose to 65%. At present, there are about 9.2 billion proven reserves in the deep waters of 18 basins on 6 continental shelves. m 3 Oil equivalent, it is estimated that there are about 13.6 billion m 3 Unproven reserves....

Claims

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Application Information

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IPC IPC(8): C09K8/50
Inventor 王成文王瑞和步玉环
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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