Oil-soluble temporary plugging agent for refracturing of oil-water wells and preparation method thereof

An oil-soluble temporary plugging agent and a technology for repeated fracturing, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost of oil-soluble temporary plugging agent, poor plugging effect, limited material source, etc. , to achieve the effect of reducing construction cost, facilitating popularization and application, and simple production process

Active Publication Date: 2019-10-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used oil-soluble temporary plugging agents are mostly used in water plugging and workover operations, and the plugging strength is relatively low. If they are used in fracturing operations under relatively high pressure, the plugging effect will not be good.
In addition, due to limited sources of materials and cumbersome preparation methods, oil-soluble temporary plugging agents are often expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This example provides an oil-soluble temporary plugging agent for repeated fracturing of oil-water wells, which is composed of the following substances in mass percentage: 15%-25% of water, 15%-25% of modified phenolic resin, dicyclopentadiene Resin 10%-20%, fatty acid glyceride surfactant 10%-30%, sodium chloride 20%-30%.

[0021] The principle of the invention: modified phenolic resin has good toughness and heat resistance, which is used to improve the temporary plugging strength and temperature resistance of the temporary plugging agent; dicyclopentadiene resin (DCPD resin) has extremely high cohesiveness, Mainly play the role of bonding and molding solidification; fatty acid glyceride surfactants play the role of emulsifying the resin; sodium chloride plays the role of adjusting the dissolution rate of the temporary plugging agent.

Embodiment 2

[0023] On the basis of Example 1, this example provides an oil-soluble temporary plugging agent for repeated fracturing of oil-water wells, which consists of the following substances in mass percentages: 20% water, 15% modified phenolic resin, dicyclopentan Diene resin 10%, fatty acid glyceride surfactant 25%, sodium chloride 30%.

[0024] Preparation process: Step 1) Add 20Kg of water into a high-temperature closed furnace and heat to 50°C, then add 25Kg of fatty acid glyceride surfactant into the furnace and stir thoroughly to completely dissolve the surfactant; Step 2) Heat Keep the solution at 75~80°C, add 15Kg of modified phenolic resin and stir evenly; step 3) add 10Kg of dicyclopentadiene resin to melt and stir evenly; finally add 30Kg of sodium chloride and stir for 2 hours, stop heating; Step 4) Pour the uniformly stirred solution into the centrifuge container, and the centrifuge container rotates at a certain speed and sprays the mixed solution in the form of droplet...

Embodiment 3

[0029] On the basis of Example 1, this example provides an oil-soluble temporary plugging agent for repeated fracturing of oil-water wells, which consists of the following substances in mass percentages: 20% water, 20% modified phenolic resin, dicyclopentan Diene resin 15%, fatty acid glyceride surfactant 20%, sodium chloride 25%.

[0030] Preparation process: Step 1) Add 20Kg of water into a high-temperature closed furnace and heat to 50°C, then add 20Kg of fatty acid glyceride surfactant into the furnace and stir thoroughly to completely dissolve the surfactant; Step 2) Heat Keep the solution at 75~80°C, add 20Kg of modified phenolic resin and stir evenly; step 3) add 15Kg of dicyclopentadiene resin to melt and stir evenly; finally add 25Kg of sodium chloride and stir for 2 hours, stop heating; Step 4) Pour the uniformly stirred solution into the centrifuge container, and the centrifuge container rotates at a certain speed and sprays the mixed solution in the form of droplet...

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Abstract

The invention provides an oil-soluble temporary plugging agent for oil-water well refracturing. The oil-soluble temporary plugging agent consists of the following substances by weight percent: 15-25% of water, 15-25% of modified phenol-formaldehyde resin, 10-20% of dicyclopentadiene resin, 10-30% of a fatty glyceride type surfactant, and 20-30% of sodium chloride. The oil-soluble temporary plugging agent provided by the invention is high in oil solution ratio and high in dissolution rate, is higher in plugging strength compared with that of a conventional oil-soluble temporary plugging agent, can meet requirements of fracturing construction, can be dissolved quickly after the fracturing construction without polluting a reservoir stratum, achieves an effect of plugging cracks during the fracturing construction, and is low in use level which is reduced by 40-50% compared with that of the conventional oil-soluble temporary plugging agent, so that the construction cost is reduced. The oil-soluble temporary plugging agent provided by the invention is simple in production process and convenient to promote and apply.

Description

technical field [0001] The invention belongs to the technical field of repeated fracturing, and in particular relates to an oil-soluble temporary plugging agent for repeated fracturing of oil-water wells and a preparation method thereof. Background technique [0002] Hydraulic fracturing is one of the main technologies for the reconstruction of low-permeability oil and gas reservoirs. However, the oil and gas wells after hydraulic fracturing will fail due to many reasons after a period of production. In addition, some fracturing operations will cause pollution to the production layer after the implementation, which will also make the fracturing fail to achieve the expected effect. For such oil and gas wells, most of them must be refractured to increase production capacity. Temporary plugging fracturing technology is mainly used to solve the complex oil-water relationship and well-developed micro-fractures in the oil layer. After a period of exploitation in water injection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508
Inventor 宋振云许伟星汪小宇吴增智李志航王季鹏王小文徐洋樊庆缘王忍峰赵晨君孟庆聪李文彬谢新秋范杰李珊李雪
Owner BC P INC CHINA NAT PETROLEUM CORP
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