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Outside casing channeling-blocking agent

A channel sealing agent and retarder technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the difficult problem of oil and water well pipe external channel channeling, oil well cement and ultra-fine cement and low success rate of sealing channeling , poor bonding strength, etc.

Active Publication Date: 2012-09-26
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 channeling agent commonly used in oilfields at home and abroad is oil well cement or ultra-fine cement, which is generally used in oilfield water plugging, channeling sealing, and leakage plugging. Field applications show that although oil well cement or ultra-fine cement has high strength , but the volume will shrink after solidification, and micro-cracks will occur, the bonding strength is poor, and the plugging rate is low. Therefore, the success rate of oil well cement and ultra-fine cement sealing is low, and it is difficult to solve the problem of channeling outside the oil and water well pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A kind of sealing channeling agent outside the pipe, the concrete steps of its technical scheme are as follows:

[0012] Weigh 40g of water, add 1g of iron complex salt respectively under stirring, after all dissolve, slowly and alternately add 1g of nano-zinc oxide, 2g of nano-titanium oxide, 20g of silicon micropowder, 33g of ultra-fine cement and other materials under high-speed stirring, wait until fully After dispersion, continue to stir while adding 1.5g glass fiber and 1.5g sodium pyrophosphate until evenly mixed, take the slurry and pour it into a constant temperature container, seal it and place it in a constant temperature water bath at 80°C for constant temperature curing for 48 hours, take out the solidified product according to the requirements of the core flow test Drill the core and measure its breakthrough pressure as 1.3 MPa / cm; pour the prepared slurry into a stoppered measuring cylinder, record the volume of the slurry, seal it and put it in a constant...

Embodiment 2

[0014] A kind of sealing channeling agent outside the pipe, the concrete steps of its technical scheme are as follows:

[0015] Weigh 38g of water, add 1.5g of iron complex salt respectively under stirring, after all dissolve, slowly and alternately add materials such as 1.5g of nano-zinc oxide, 1g of nano-titanium oxide, 17g of silicon micropowder, 39g of ultra-fine cement under high-speed stirring, After being fully dispersed, continue to stir while adding 1g of glass fiber and 1g of sodium pyrophosphate until evenly mixed, take the slurry and pour it into a constant temperature container, seal it and place it in a constant temperature water bath at 80°C for constant temperature curing for 48 hours, take out the solidified material and perform the core flow test It is required to drill the core and measure its breakthrough pressure as 1.5MPa / cm; pour the above-mentioned prepared slurry into a stopper measuring cylinder, record the volume of the slurry, seal it and put it in a...

Embodiment 3

[0017] A kind of sealing channeling agent outside the pipe, the concrete steps of its technical scheme are as follows:

[0018] Weigh 39g of water, add 1g of iron complex salt respectively under stirring, after all dissolve, slowly and alternately add materials such as 2g nano-zinc oxide, 1g nano-titanium oxide, 17.5g silicon micropowder, 37g ultra-fine cement under high-speed stirring, wait until After fully dispersed, continue to stir while adding 2g of glass fiber and 0.5g of sodium pyrophosphate until evenly mixed, take the slurry and pour it into a constant temperature container, seal it and place it in a constant temperature water bath at 80°C for constant temperature curing for 48 hours, take out the solidified product according to the requirements of the core flow test Drill the core and measure its breakthrough pressure as 1.4MPa / cm; pour the prepared slurry into a stoppered measuring cylinder, record the volume of the slurry, seal it and put it in a constant temperatu...

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PUM

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Abstract

The invention discloses an outside casing channeling-blocking agent which is applicable to the blocking of the outside casing channeling of an oil-water well casing on an oil field. The outside casing channeling-blocking agent is composed of 0.5-2% of nano zinc oxide, 1-3% of nano titanium oxide, 15-30% of silicon micro powder, 0.5-2% of glass fiber, 30-45% of ultra-fine cement, 1-1.5% of complex iron salt, 0.5-2% of retarder and 35-45% of water. Because of the addition of the part of the nano materials, the channeling-blocking agent has good slurry fluidity and high thixotropy, ensures high intensity and non-shrinking volume after being cured, produces no micro crack and has high blocking rate. Besides, the channeling-blocking agent can effectively solve the outside casing channeling problem caused by poor high pressure water injection quality of a water injection well, poor well cementing quality of an oil well or other reasons, and can be also used for secondary well cementing above the top of the cement.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to an external pipe sealing agent. Background technique [0002] At present, the high-strength chemical channeling agent commonly used in oilfields at home and abroad is oil well cement or ultra-fine cement, which is generally used in oilfield water plugging, channeling sealing, and leakage plugging. Field applications show that although oil well cement or ultra-fine cement has high strength , but the volume will shrink after solidification, and micro-cracks will occur, the cementation strength is poor, and the plugging rate is low. Therefore, the success rate of oil well cement and ultra-fine cement sealing is low, and it is difficult to solve the problem of channeling outside the oil and water well pipe. Contents of the invention [0003] The purpose of the present invention is to provide a channel sealing agent outside the pipe. [0004] The technical solution of t...

Claims

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Application Information

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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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