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Thixotropic chemical sealing channeling agent

A sealing agent and thixotropic technology, applied in chemical instruments and methods, sealing/isolation, wellbore/well components, etc., can solve the problems of easy formation of pores and crevice structures, low cement extrusion pressure, and poor plugging effect and other problems, to achieve the effect of outstanding crack resistance, small formation damage and convenient operation

Active Publication Date: 2011-09-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the pumping process, the cement slurry is easy to dehydrate and leak after being sheared by the blasthole, has low solidification strength, high shrinkage rate, and easily forms pores and crevices. The cement pressure is not high, the amount of cement squeezed is large, and the cement subsidence phenomenon causes poor plugging effect, and the pressure test fails after drilling the cement plug, and the validity period is also very short.

Method used

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  • Thixotropic chemical sealing channeling agent

Examples

Experimental program
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Effect test

Embodiment 1

[0027]

[0028] Wherein, the iron-rich low-carbon sulfoaluminate is purchased from Anshan Angang Slag Development Company, wherein Fe 2 o 3 Content 10.5%, carbon loss on ignition 2.5%, particle size 5.5μm;

[0029] The sodium-based bentonite is purchased from Heishan Bentonite Factory, and the expansion factor is 30 times;

[0030] The redispersible latex powder is produced by Dalian Chemical Industry (Jiangsu) Co., Ltd., with a solid content of 98%, a 400 μm sieve residue of no more than 2%, and a minimum film-forming temperature of 0°C;

[0031] The BET specific surface area of ​​the ultrafine silica is 165m 2 / g;

[0032] The cyclodextrin is alpha-cyclodextrin.

[0033] When using, prepare a piece of about 5m 3 Add water, iron-rich low-carbon sulfoaluminate, sodium bentonite, redispersible latex powder, ultra-fine silica, cyclodextrin, etc. in a proportional manner under stirring, and stir thoroughly for 5 to 10 minutes Finally, a chemical blocking agent with suita...

Embodiment 2

[0035]

[0036] Wherein, the iron-rich low-carbon sulfoaluminate is purchased from Liaoning Haicheng Mineral Powder Factory, wherein Fe 2 o 3 Content 9.5%, carbon loss on ignition 2%, particle size 4μm;

[0037] The sodium-based bentonite is purchased from Heishan Bentonite Factory, and the expansion factor is 50 times;

[0038] The redispersible latex powder is produced by Dalian Chemical Industry (Jiangsu) Co., Ltd., with a solid content of 98%, a 400 μm sieve residue of no more than 2%, and a minimum film-forming temperature of 0°C;

[0039] The BET specific surface area of ​​the ultrafine silica is 165m 2 / g;

[0040] The cyclodextrin is beta-cyclodextrin.

[0041] When using, prepare a piece of about 3m 3 Add water, iron-rich low-carbon sulfoaluminate, sodium-based bentonite, redispersible latex powder, ultrafine silica, cyclodextrin, etc. in sequence in a stirring state, and stir thoroughly for 5 to 10 minutes Finally, a chemical blocking agent with suitable visco...

Embodiment 3

[0043]

[0044] Wherein, the iron-rich low-carbon sulfoaluminate is purchased from Liaoning Haicheng Mineral Powder Factory, wherein Fe 2 o 3 Content 9.5%, carbon loss on ignition 2%, particle size 4μm;

[0045] The sodium-based bentonite is purchased from Heishan Bentonite Factory, and the expansion factor is 50 times;

[0046] The redispersible latex powder is produced by Dalian Chemical Industry (Jiangsu) Co., Ltd., with a solid content of 98%, a 400 μm sieve residue of no more than 2%, and a minimum film-forming temperature of 0°C;

[0047] The BET specific surface area of ​​the fumed silica is 260m 2 / g;

[0048] The starch is commercially available cornstarch.

[0049] When using, prepare a piece of about 3m 3 In a stirring tank, add water, iron-rich low-carbon sulfoaluminate, sodium bentonite, redispersible latex powder, fumed silica, starch, etc. in sequence in a stirring state, and stir thoroughly for 5 to 10 minutes to obtain It is a chemical blocking agent ...

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Abstract

The invention provides a thixotropic chemical sealing channeling agent. The sealing channeling agent comprises the following raw materials: 40 to 55 weight parts of iron rich low-carbon sulfur aluminate, 0.2 to 5.0 weight parts of sodium-based bentonite, 0.5 to 2.0 weight parts of fluid loss agent, 0.2 to 5.0 weight parts of white carbon black, 0.5 to 4.0 weight parts of cyclodextrin and / or starch and 30 to 50 weight parts of water. The chemical sealing channeling agent has the characteristics of strong adhesion and thermal stability, good durability, prominent cracking resistance and the like; the linear expansion rate reaches over 0.2 percent, the compressive strength reaches over 30MPa, and the shearing strength reaches over 10MPa; and by adding dispersant, fluid loss agent and thixotropic regulator, the sealing channeling agent has high thixotropic property and loss resistance.

Description

technical field [0001] The invention relates to a chemical agent for oil recovery, in particular to an inorganic gelling material, which can be used for cementing and sealing of oil and water wells, and is a thixotropic chemical sealing agent. Background technique [0002] After multiple rounds of steam injection in heavy oil and ultra-heavy oil wells, due to the repeated erosion of the cement sheath by high-temperature hot and humid steam, and the difference in expansion coefficient between cement, rock and casing, the casing and cement sheath or Channeling between the cement sheath and the well wall. The normal production of the oil well is seriously affected after the channeling outside the oil well pipe. [0003] For ultra-heavy oil reservoirs with channel channeling wells outside the pipe, cement extrusion is usually used to seal channeling, and oil well cement is used as the main agent for sealing channeling. During the pumping process, the cement slurry is easy to d...

Claims

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Application Information

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IPC IPC(8): C09K8/46E21B33/13
Inventor 龙华李瑞马昌明潘建华张守军郎宝山高本成刘恩宏朱富林王志兼白云渡
Owner PETROCHINA CO LTD
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