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Large-temperature-difference low-thermal-conductivity cement paste suitable for long-sealing-section well cementation

A large temperature difference, hot water conduction technology, applied in solid waste management, drilling composition, sustainable waste treatment, etc., can solve the problem of large thermal conductivity of cement stone in the annulus, large heat loss due to oil and gas migration, and strength of cement stone at the top Low-level problems, to achieve the effect of improving interlayer sealing ability, avoiding volume shrinkage, and good fluidity

Active Publication Date: 2020-12-18
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to overcome the problems of low cement stone strength at the top and high thermal conductivity of cement stone in the annular space, and large heat loss during oil and gas migration under the condition of large temperature difference

Method used

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  • Large-temperature-difference low-thermal-conductivity cement paste suitable for long-sealing-section well cementation
  • Large-temperature-difference low-thermal-conductivity cement paste suitable for long-sealing-section well cementation
  • Large-temperature-difference low-thermal-conductivity cement paste suitable for long-sealing-section well cementation

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Experimental program
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Effect test

Embodiment 1

[0040] The density is 1.50g / cm 3 The lightening agent (microsphere) adopts the hollow glass microsphere produced by Sinosteel Maanshan Mining Institute New Material Technology Co., Ltd.

[0041]

[0042] All of the above are measured in quality units;

[0043] Wherein, the density of the low-density cement slurry is 1.40g / cm 3 , the temperature is 100°C, and the pressure bearing capacity is 50MPa;

[0044] The low thermal conductivity material is composed of the following components in parts by weight: 0.75 parts of microsilicon, 0.08 parts of perlite, 0.08 parts of diatomite, 0.06 parts of bentonite, 0.10 parts of fiber powder, and 0.04 parts of tungsten diselenide;

[0045] The microspheres are high-strength glass microspheres, and the true density of the high-strength glass microspheres is 0.60g / cm 3 , the particle size is 3.55-111um, the median particle size Dv(50) is 28μm, and Dv(90) is 51.3μm;

[0046] The expansion agent is composed of sodium chloride: sodium thi...

Embodiment 2

[0052] The density is 1.45g / cm 3 The lightening agent (microsphere) adopts the hollow glass microsphere produced by Sinosteel Maanshan Mining Institute New Material Technology Co., Ltd.

[0053]

[0054] All of the above are measured in quality units;

[0055] Wherein, the density of the low-density cement slurry is 1.35g / cm 3 , the temperature is 120°C, and the pressure bearing capacity is 60MPa;

[0056] The low thermal conductivity material is composed of the following components in parts by weight: 0.70 parts of microsilicon, 0.10 parts of perlite, 0.05 parts of diatomaceous earth, 0.08 parts of bentonite, 0.12 parts of fiber powder, and 0.04 parts of tungsten diselenide;

[0057] The microspheres are high-strength glass microspheres, and the true density of the high-strength glass microspheres is 0.55g / cm 3 , the particle size is 3.55-111um, the median particle size Dv(50) is 28μm, and Dv(90) is 51.3μm;

[0058] The expansion agent is composed of sodium chloride: s...

Embodiment 3

[0064] The density is 1.40g / cm 3 The lightening agent (microsphere) adopts the hollow glass microsphere produced by Sinosteel Maanshan Mining Institute New Material Technology Co., Ltd.

[0065]

[0066] All of the above are measured in quality units;

[0067] Wherein, the density of the low-density cement slurry is 1.50g / cm 3 , the temperature is 60°C, and the pressure bearing capacity is 80MPa;

[0068] The low thermal conductivity material is composed of the following components in parts by weight: 0.85 parts of microsilicon, 0.03 parts of perlite, 0.06 parts of diatomite, 0.09 parts of bentonite, 0.15 parts of fiber powder, and 0.03 parts of tungsten diselenide;

[0069] The microspheres are high-strength glass microspheres, and the true density of the high-strength glass microspheres is 0.55-0.65g / cm 3 , the particle size is 3.55-111um, the median particle size Dv(50) is 28μm, and Dv(90) is 51.3μm;

[0070] The expansion agent is composed of sodium chloride: sodium...

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Abstract

The invention belongs to the field of well cementation operation in petroleum engineering, and relates to large-temperature-difference low-thermal-conductivity cement paste suitable for long-sealing-section well cementation. The low-thermal-conductivity cement paste comprises the following components in parts by weight: 100 parts of G oil well cement, 15-20 parts of a low thermal conductivity material, 16-32 parts of micro beads, 2.5-4 parts of an expanding agent, 3-4 parts of a fluid loss agent, 1.5-2 parts of a dispersing agent, 1.5-3 parts of a retarder, 0.5-1 part of a defoaming agent, and70-85 parts of water. According to the blended low-density cement paste system, domestic high-strength glass beads are used as a main lightening admixture, and a low-thermal-conductivity material containing micro-silicon is added to reduce the thermal conductivity coefficient of set cement. Therefore, the formed low-cost and high-performance cement paste system can greatly improve the well cementation quality of a deep well leaky stratum, reduce the thermal conductivity coefficient of a cement sheath and improve the thermal preservation capacity of a wellbore.

Description

technical field [0001] The invention belongs to the field of well cementing operations in petroleum engineering, and relates to a cement slurry with large temperature difference and low thermal conductivity suitable for well cementing in long sealing sections. Background technique [0002] Crude oil has certain viscous properties. When the temperature is lower than 35°C, its fluidity becomes poor, or even solidifies and cannot flow. Especially when the area north of the Yellow River enters winter production, the low temperature of the environment will reduce the temperature of the inner wall of the oil well and the oil pipeline, resulting in pipeline failure. Crude oil flows slowly, and even the wax contained in crude oil precipitates to form a sediment layer. The oil production wellhead adopts water jacket furnace or electric heating belt, etc., and installs the wellhead pipeline heating device, which can quickly increase the temperature and fluidity of crude oil. [0003]...

Claims

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Application Information

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IPC IPC(8): C04B28/04C09K8/467C04B14/22C04B18/14
CPCC04B28/04C09K8/467C04B14/22C04B18/146C04B2201/20C04B2201/50C04B14/18C04B14/08C04B14/104C04B20/0048C04B22/08C04B22/124C04B22/147C04B24/20C04B2103/302C04B22/04C04B24/2623C04B14/06C04B24/163C04B24/2652C04B24/32C04B22/002C04B24/18C04B24/003C04B24/22Y02W30/91
Inventor 王永洪候金三李璞卢德安潘军李勇
Owner 成都欧美克石油科技股份有限公司
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