Bridging particle for shallow casing blind hole

A plugging agent and casing leakage technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of short thickening time of oil well cement and ultra-fine cement, difficulty in solving the problem of casing leakage, and low plugging success rate and other problems, to achieve the effect of no shrinkage in curing volume, no shrinkage in volume, and improved safety

Active Publication Date: 2012-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the high-strength chemical plugging agents commonly used in oil fields at home and abroad are oil well cement or ultra-fine cement, which are generally used in oilfield water plugging, channeling plugging, and leak plugging. Field applications show that although oil well cement or ultra-fine cement has high strength , but the volume will shrink after curing, and micro-cracks will be generated, the plugging success rate is low, and due to the short thickening time of oil well cement and ultra-fine cement, there is a certain construction risk, it is difficult to solve the corrosion and perforation of oil and water well casing leaking problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of plugging agent for shallow casing lost circulation well, the concrete steps of its technical scheme are as follows:

[0013] Weigh 40g of water, add 0.5g of iron complex salt under stirring, after it is completely dissolved, slowly add 2g of nano-zirconia, 17g of silica powder, 13g of light calcium carbonate, 26g of ultra-fine cement, 0.5g of glass fiber, etc. under high-speed stirring After the material is fully stirred evenly, continue to add 1g of calcium formate while stirring until it is evenly mixed, take the slurry and put it into a constant temperature container and mold, seal it and put it in a constant temperature water bath at 60°C for constant temperature curing for 48 hours, take out the solidified body and flow it according to the core The test requires drilling a rock core and measuring its breakthrough pressure as 1.0MPa / cm; taking out the solidified body in the mold, and measuring its compressive strength with a uniformly loaded pressure testin...

Embodiment 2

[0015] A kind of plugging agent for shallow casing lost circulation well, the concrete steps of its technical scheme are as follows:

[0016] Weigh 37g of water, add 1g of iron complex salt under stirring, after it is completely dissolved, slowly add 1.5g of nano-zirconia, 18g of silicon micropowder, 14g of light calcium carbonate, 27g of ultra-fine cement, 1g of glass fiber and other materials under high-speed stirring After fully stirring evenly, continue to add 0.5g of calcium formate while stirring until evenly mixed, take the slurry and put it into a constant temperature container and mold, seal it and put it in a constant temperature water bath at 60°C for 48 hours, take out the solidified body and flow it according to the core The test requires drilling a rock core and measuring its breakthrough pressure as 1.3MPa / cm; taking out the solidified body in the mold, and measuring its compressive strength with a uniformly loaded pressure testing machine as 31.5MPa; pouring the...

Embodiment 3

[0018] A kind of plugging agent for shallow casing lost circulation well, the concrete steps of its technical scheme are as follows:

[0019] Weigh 35g of water, add 1g of iron complex salt under stirring, after it is completely dissolved, slowly add 1g of nano-zirconia, 19g of silica powder, 15g of light calcium carbonate, 28g of ultra-fine cement, 0.5g of glass fiber and other materials under high-speed stirring After fully stirring evenly, continue to add 0.5g of calcium formate while stirring until evenly mixed, take the slurry and put it into a constant temperature container and mold, seal it and put it in a constant temperature water bath at 60°C for 48 hours, take out the solidified body and flow it according to the core The test requires drilling a rock core and measuring its breakthrough pressure as 1.2MPa / cm; taking out the solidified body in the mold, and measuring its compressive strength with a uniformly loaded pressure testing machine as 30.8MPa; pouring the prepa...

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Abstract

The invention discloses a bridging particle for a shallow casing blind hole. The bridging particle is suitable for the leakage stoppage of a shallow casing blind hole in an oil field, and comprises 1 to 3% of nano-zirconia, 10 to 20% of silica micropowder, 10 to 15% of light calcium carbonate, 25 to 40% of superfine cement, 0.2 to 2% of glass fiber, 1 to 2% of drag reducer, 0.5 to 2% of early strength agent and 30 to 45% of water. The slurry of the bridging particle has good thixotropy; the multiviscosity time is adjustable; the strength is high and the volume does not shrink after solidification; and no micro-cracks are generated. The invention can effectively solve technical problems of oil field leakage stoppage, such as severe casing leakage after a casing of an oil-water well is corroded and holed, while improving construction safety.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a plugging agent for perforated leakage wells in shallow layers. Background technique [0002] At present, the high-strength chemical plugging agents commonly used in oil fields at home and abroad are oil well cement or ultra-fine cement, which are generally used in oilfield water plugging, channeling plugging, and leak plugging. Field applications show that although oil well cement or ultra-fine cement has high strength , but the volume will shrink after curing, and micro-cracks will be generated, the plugging success rate is low, and due to the short thickening time of oil well cement and ultra-fine cement, there is a certain construction risk, it is difficult to solve the corrosion and perforation of oil and water well casing Leakage problems caused. Contents of the invention [0003] The object of the present invention is to provide a leak-stopping agent with hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 魏开鹏罗懿李克智卢瑜林
Owner CHINA PETROLEUM & CHEM CORP
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