Sealing blocking agent for blasthole

A technology of plugging agent and blasthole, which is applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc. It can solve the problems of short validity period, high cost and high construction risk of mechanical sealing

Inactive Publication Date: 2005-01-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the high temperature and high pressure reservoir conditions in Zhuangxi area, the validity period of mechanical sealing is short and the success rate is low
The chemical plugging method is mainly to inject a plugging agent into the target layer to seal off the surrounding area of ​​the blast hole. The currently used plugging agent is mainly cement, but the amount of plugging agent required for cement extrusion is larg

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0007] Embodiment: take the production of 1t as an example to illustrate. Add 110kg of coal cinder (particle size less than 2mm), 440kg of fly ash, 220kg of calcium-based bentonite and 30kg of wood powder (particle size of less than 0.5mm) into the cement mixer, start the mixer, slowly spray 200kg of thermosetting resin, and mix well Pour it out, air-dry it, crush it to less than 2mm, and pack it in a three-in-one bag.

[0008] The characteristics of blasthole plugging agent of the present invention:

[0009] 1. High strength (not destroyed under large pressure difference);

[0010] 2. The curing time is adjustable (in the range of 1 to 4 hours, to ensure sufficient construction time);

[0011] 3. Have a certain toughness (not easy to break under vibration and impact conditions);

[0012] 4. Good combination with formation rock (capable of high production pressure difference);

[0013] 5. Small density (easy to carry);

[0014] 6. Can fully fill the entire blast hole;

...

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PUM

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Abstract

The invention provides a petroleum recovering embrasure plugging agent, mixed of five materials in percent: cinder (particle size less than 2 mm) 7%-11%, powder coal ashes 36%-44%, calcium-based colloidal clay 16%-22%, wood powder (particle size less than 0.5 mm) 1%-5% and thermosetting Arcolite 18%-20%. It has high strength, adjustable curing time, specific flexibility, good combinability with stratum rocks, low density, ability to fully plug the whole embrasure, good water, oil, acid, alkali and temperature resistance, etc.

Description

Technical field: [0001] The invention relates to an oilfield chemical agent, in particular to a blasthole plugging agent. Background technique: [0002] In the process of oilfield development, most of the oil wells are combined production of oil layers above the second layer. After the oil field enters the high water cut period, the injected water rushes along the high permeability layer, making the high permeability layer become a high pressure layer, affecting the normal fluid production of the middle and low permeability layers. At the same time, due to the long-term water injection development, the remaining oil saturation of the high-permeability layer decreases, and the utilization value decreases. Therefore, some high-permeability layers need to be sealed. At the same time, in the work of repairing holes and changing layers, due to reasons such as electrical measurement interpretation errors and perforation errors, misinjection of water layers also occurs from time ...

Claims

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Application Information

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IPC IPC(8): E21B33/12
Inventor 张贵才尚朝晖孙铭勤杜勇葛际江冷强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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