Silicate grout for deep water

A technology of cement slurry and cement, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems affecting the performance of cement slurry in the sealing section, accidents, and increased workload of cementing operations, so as to reduce the cementing time. Coagulation time, convenient cementing operation, controllable and adjustable thickening time

Active Publication Date: 2014-03-05
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the current cementing operations in offshore oil fields, the cement is blown from the cement carrier to the drilling platform by soot blowing. After blowing the mixed cement, it is necessary to clean the ash tank if the stratum in other temperature ranges is to be sealed, otherwise It will affect the performance of cement slurry in other sealing sections, which may cause serious accidents, and cleaning the ash tank will increase the workload of cementing operations
At present, there is no report on the use of G-grade Portland cement slurry in deepwater surface casing cementing in China.

Method used

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  • Silicate grout for deep water

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1, the preparation of portland cement slurry

[0031] The formula is: 1.20 Jiahua G-grade cement 100Kg, South China Sea deep sea water 100Kg, a mixture of ultra-fine slag powder and ultra-fine G-grade cement 25Kg (the mass-number ratio of ultra-fine slag powder and ultra-fine G-grade cement is 2 : 3), potassium tartrate 0.1Kg, calcium lignosulfonate (Jingzhou Jiahua Science and Technology Co., Ltd.) and sodium polystyrene sulfonate (number average molecular weight is 5000g / mol, Jingzhou Jiahua Science and Technology Co., Ltd.) mixture 3Kg (wherein , the mass fraction ratio of calcium lignosulfonate and sodium polystyrene sulfonate is 2:1), hollow calcium borosilicate microbeads (its density is 0.44g / cm 3 ) 34Kg, 2-acrylamide-2-methylpropanesulfonic acid-acrylamide copolymer (number average molecular weight is 100000g / mol) 5Kg.

[0032] Mix the above-mentioned components evenly to obtain Portland cement slurry, and perform a performance test according to the ...

Embodiment 2

[0033] Embodiment 2, the preparation of portland cement slurry

[0034] The formula is: 100Kg of 1.40 Jiahua G-grade cement, 70Kg of China Bohai deep sea water, 20Kg of a mixture of ultra-fine slag powder, ultra-fine G-grade cement and sodium sulfate (among them, ultra-fine slag powder, ultra-fine G-grade The mass fraction ratio is 2: 3: 1), the mixture 2Kg of calcium lignosulfonate (Jingzhou Jiahua Technology Co., Ltd.) and sodium carbonate (wherein, the mass fraction ratio of calcium lignosulfonate and sodium carbonate is 1: 1), hollow calcium borate silicon borate microbeads (its density is 0.44g / cm 3 ) 18Kg, acrylamide-sodium acrylate copolymer (the number average molecular weight is 2000000g / mol) 4Kg.

[0035] Mix the above-mentioned components evenly to obtain Portland cement slurry, and perform a performance test according to the deep water cementing test standard API10B-3-2004. The performance test results are shown in Table 1.

Embodiment 3

[0036] Embodiment 3, the preparation of portland cement slurry

[0037] The formula is: 1.50 Jiahua G grade cement 100Kg, fresh water 60Kg, superfine slag powder, superfine G grade cement and potassium chloride mixture 10Kg (among them, the mass of superfine slag powder, superfine G grade cement and potassium chloride Parts ratio is 2: 3: 1), calcium lignosulfonate (Jingzhou Jiahua Technology Co., Ltd.) and sodium silicate mixture 1Kg (wherein, the mass-number ratio of calcium lignosulfonate and sodium silicate is 1 : 1), hollow calcium borosilicate microbeads (its density is 0.44g / cm 3 ) 13Kg, acrylamide-sodium acrylate copolymer (number average molecular weight 200000g / mol) 3Kg.

[0038] Mix the above-mentioned components evenly to obtain Portland cement slurry, and perform performance tests on it according to the deep water cementing test standard API10B-3-2004. The performance test results are shown in Table 1.

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Abstract

The invention discloses silicate grout for deep water, which consists of the following ingredients in parts by mass: 100 parts of cement, 2 to 40 parts of lightening agents, 3 to 7 parts of filtrate or reduction agents, 1 to 5 parts of dispersant, 10 to 50 parts of reinforcing agents, 0.1 to 1.5 parts of retarder and 50 to 100 parts of water. The silicate grout has excellent low-temperature early strength and low-temperature approximately right-angle thickening performance, the defects of slow gel strength development of the silicate grout at low temperature and low density and low early strength are overcome, and the surface casing and cementing operation can be ensured under the conditions of low temperature and low cracking pressure in deep water and complicated air flows in shallow water.

Description

technical field [0001] The invention relates to a Portland cement slurry, in particular to a Portland cement slurry for deep water. Background technique [0002] Deep water refers to the sea area with a water depth greater than 350 meters. The deep water surface casing is the outermost casing of the deep water oil and gas well casing program. Its main functions are: to isolate the upper seawater layer and prevent seawater and surface groundwater from penetrating into the wellbore; to protect the wellhead , to strengthen the well wall of the surface well section below the mud line; for those who continue to drill and encounter high-pressure oil and gas layers, install blowout preventers on the surface casing to prevent blowout; during oil and gas production, install underwater oil recovery devices, etc. The operating environment of pipe cementing in oceanic deep water surface has the outstanding characteristics of low temperature, low formation fracture pressure, existence of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C09K8/473
Inventor 耿亚楠许明标刘书杰周建良朱磊王晓亮林平
Owner CHINA NAT OFFSHORE OIL CORP
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