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Sulphoaluminate cement paste for deepwater cementing

A technology of sulphoaluminate and cement slurry, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of long thickening conversion time, poor ability to prevent shallow layer flow, difficult solidification, etc., and achieve thickening The effect of adjustable time, short thickening time and fast strength at low temperature

Inactive Publication Date: 2011-02-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cement is difficult to solidify at low temperature, and the thickening conversion time is long, and the ability to prevent shallow flow is poor

Method used

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  • Sulphoaluminate cement paste for deepwater cementing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the preparation of sulphoaluminate cement slurry

[0025] The formula is: 100kg of sulfoaluminate cement, 75kg of fresh water, hollow calcium borosilicate microspheres (the density of which is 0.44g / cm 3 ) 32kg, acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer (the number average molecular weight is 9×10 5 g / mol) 5kg, sodium sulfate 1.5kg, citric acid 0.25kg, formaldehyde acetone condensate 0.5kg.

[0026] Preparation method: pre-mix the required solid materials evenly for use, then mix the liquid materials evenly, add the pre-mixed solid materials, and stir evenly to obtain sulphoaluminate cement slurry; according to the cementing test standard API10B-2- 2005 and the deepwater cementing standard API10B-3-2004 conducted performance tests on the sulphoaluminate cement slurry, and the results are shown in Table 1.

Embodiment 2

[0027] Embodiment 2, preparation of sulphoaluminate cement slurry

[0028] The formula is: 100kg of sulphoaluminate cement, 70kg of deep sea water in the Bohai Sea of ​​China, hollow calcium borosilicate microspheres (with a density of 0.44g / cm 3 ) 20kg, acrylamide-sodium acrylate copolymer (the number average molecular weight is 7×10 5 g / mol) 4kg, potassium chloride and sodium nitrate mixture 1.5kg (wherein, the mass and number ratio of potassium chloride and sodium nitrate is 1: 1), boric acid 0.2kg, formaldehyde acetone condensate 1kg.

[0029] Preparation method: pre-mix the required solid materials evenly for use, then mix the liquid materials evenly, add the pre-mixed solid materials, and stir evenly to obtain sulphoaluminate cement slurry; according to the cementing test standard API10B-2- 2005 and the deepwater cementing standard API10B-3-2004 conducted performance tests on the sulphoaluminate cement slurry, and the results are shown in Table 1.

Embodiment 3

[0030] Embodiment 3, preparation of sulphoaluminate cement slurry

[0031] The formula is: 100kg of sulfoaluminate cement, 63kg of deep seawater from the South China Sea, hollow calcium borosilicate microspheres (the density of which is 0.44g / cm 3 ) 18kg, acrylamide-sodium acrylate copolymer (the number average molecular weight is 7×10 5 g / mol) 4kg, sodium metaaluminate 1.5kg, sodium ethylenediamine tetramethylene phosphonate 0.5kg, formaldehyde acetone condensate 1.5 parts.

[0032] Preparation method: pre-mix the required solid materials evenly for use, then mix the liquid materials evenly, add the pre-mixed solid materials, and stir evenly to obtain sulphoaluminate cement slurry; according to the cementing test standard API10B-2- 2005 and the deepwater cementing standard API10B-3-2004 conducted performance tests on the sulphoaluminate cement slurry, and the results are shown in Table 1.

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Abstract

The invention discloses a sulphoaluminate cement paste for deepwater cementing, comprising cement, a lightening admixture, a fluid loss agent, a dispersing agent, a coagulant, a retarder and water. The ratio by weight of the cement to the lightening admixture to the fluid loss agent to the dispersing agent to the coagulant to the retarder and to the water is 100: (13-35): (2-5): (0.5-2): (0.5-3): (0.1-1): (48-75). The sulphoaluminate cement paste can be used at lower temperature, and has better thickening time and higher compressive strength.

Description

technical field [0001] The invention relates to a sulphoaluminate cement slurry, in particular to a sulphoaluminate cement slurry for deep water well cementing. Background technique [0002] The process of injecting mud between the borehole and casing of a well is called cementing. The main purpose of cementing is to seal off the annular space. The cement sheath in the annular space prevents the flow of formation fluid and achieves the purpose of mutual isolation between formations. A cement slurry system with excellent comprehensive performance is particularly important for cementing quality. [0003] There is a large amount of unexploited oil in the ocean field, especially the oil reserves in the deep water of the ocean are even more amazing. Deepwater drilling is an important link in the exploration and development of deepwater oil and gas resources, and cementing is an indispensable link in deepwater operations, especially in the face of complex geological structures i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/487
Inventor 李嗣贵刘科付英军王清顺王同友许明标冯克满
Owner CHINA NAT OFFSHORE OIL CORP
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