Low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing

A cementing and deep water technology, applied in the field of corrosion, low temperature, shallow water-gas channeling cementing operations, can solve the problems of complex construction process, many changing factors, high cementing risk, etc. Good performance and low cost

Active Publication Date: 2012-01-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the past, foam low-density cementing was mostly used in marine low-temperature cementing, but the construction process is complicated, there are many changing factors, and the cementing r...

Method used

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  • Low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing
  • Low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing
  • Low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Take by weighing 100 parts by weight of cement (see Table 1), 25 parts by weight of floating pearls, 5 parts by weight of II grade fly ash, 2 parts by weight of anhydrous sodium sulfate, 0.1 parts by weight of triethanolamine, and 0.5 parts by weight of borax dry-mixed as dry powder, Measure 100 parts by weight of water, weigh 0.5 parts by weight of sulfonated polystyrene and dissolve in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, and the low-temperature early-strength corrosion-resistant cement slurry for deep-water well cementing is prepared.

Embodiment 2

[0056] Take by weighing 100 parts by weight of cement (see Table 1), 30 parts by weight of floating beads, 15 parts by weight of II grade fly ash, 0.3 parts by weight of sodium lignosulfonate, 1.5 parts by weight of calcium chloride, 0.1 parts by weight of sulfonated alkyl The naphthalene methyl resin is dry mixed into dry powder, 100 parts by weight of water is taken, and 3 parts by weight of polyvinyl alcohol is taken and dissolved in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, and the low-temperature early-strength corrosion-resistant cement slurry for deep-water well cementing is prepared.

Embodiment 3

[0058] Take by weighing 100 parts by weight of cement (see Table 1), 100 parts by weight of floating beads, 20 parts by weight of class II fly ash, 0.3 parts by weight of zinc oxide, 2 parts by weight of potassium chloride, 1 part by weight of calcium chloride, 0.2 parts by weight of The sulfonated alkylnaphthalene methyl resin is dry mixed into a dry powder, and 95 parts by weight of water are taken, and 3 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid are weighed and dissolved in water. Then, put the aqueous solution in the mixing container, the stirrer rotates at a low speed (4000±200 rpm), and add the mixed dry powder within 15 seconds, cover the lid of the stirrer, and turn it at a high speed (12000±200 rpm). 500 rpm) and continue to stir for 35 seconds, and the low-temperature early-strength corrosion-resistant cement slurry for deep-water well cementing is prepared.

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PUM

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Abstract

The invention relates to a low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing. The system consists of the following components in part by weight: 100 parts of cement, 20 to 100 parts of density regulator, 0.3 to 0.6 part of retarder, 0.1 to 5 parts of fluid loss agent, 0.1 to 3 parts of early strength agent, 0 to 0.6 part of dispersant, 5 to 30 parts of heat regulator and 60 to 120 parts of water. 100 weight parts of cement contains the following components in part by weight: 20 to 70 parts of CaO, 20 to 60 parts of Al2O3, 5 to 20 parts of SiO2, 10 to 35 parts of P2O5, 0.5 to 5 parts of Fe2O3 and 1 to 4 parts of MgO. The cement paste system has excellent low-temperature early-strength, corrosion-resistant, thickening time-adjustable and 'right angle thickening' properties, and is expected to solve the main problems of low temperature, set cement corrosion, shallow water-gas channeling and the like that the deepwater cementing faces. The system is reliable in technology and low in cost, is convenient to construct on site, and is particularly suitable for low-temperature, corrosion and shallow water-gas channeling cementing operations under deepwater conditions.

Description

technical field [0001] The invention relates to a low-temperature early-strength cement slurry system for deep-water well cementing, which is particularly suitable for low-temperature, corrosion, and shallow water-gas channeling flow cementing operations under deep-water conditions. Background technique [0002] The definition of deep water changes with the development of drilling technology. Ten years ago, it refers to sea areas with a water depth of more than 300m, and now it refers to sea areas with a water depth of more than 500m, and water depths exceeding 1,500m are called ultra-deep water. Although the global deep-water oil and gas production in 2005 only accounted for 40% of the total oil and gas discoveries in the world, it rose to 65% especially in 2002-2003. So far, the proven oil reserves in deep waters are 90.573×10 8 m 3 , it is estimated that there are (135.065~158.9)×10 8 m 3 Many oil companies are competing to get involved in the development of deep wate...

Claims

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Application Information

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IPC IPC(8): C09K8/487
Inventor 程小伟郭小阳李早元谢鹏关素敏袁可李明
Owner SOUTHWEST PETROLEUM UNIV
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