In-slot temporary plugging agent for fracturing and preparation method thereof

A temporary plugging agent and fracturing technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of ineffective gel breaking and flowback, permanent damage to the reservoir, difficult gel breaking, etc., and achieve easy popularization And the use, preparation method is simple, the sealing effect is good

Active Publication Date: 2019-02-01
DAQING HUAYING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polymers and plugging pellets are the most widely used. Among them, the polymer temporary plugging agent has a good plugging effect due to its firm chemical cross-linked network structure, but there is a phenomenon of slow or even difficult gel breaking. If it is not thorough, it will cause a certain degree of damage to the formation; the plugging ball has the characteristics of high plugging strength and small deformation, but the disadvantage is that it is easy to fall off and the plugging effect is poor. Difficult to dissolve
The above-mentioned temporary plugging agents cannot effectively seal the fractures during the fracturing process, and cannot effectively break the gel and flow back, causing permanent damage to the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A temporary plugging agent for fracturing, its components and parts by weight are: 35 parts of hydroxypropyl cellulose, 10 parts of polyvinyl butyral, 15 parts of zinc oxide, 20 parts of urea-formaldehyde resin, hexamethylene 3 parts of base tetraammonium, 10 parts of calcium hypochlorite.

[0015] The preparation method of temporary plugging agent for fracturing is as follows: at room temperature 25°C, 35kg of hydroxypropyl cellulose, 10kg of polyvinyl butyral, 15kg of zinc oxide, 20kg of urea-formaldehyde resin, hexamethylene tetraammonium 3kg and 10kg of calcium hypochlorite are mixed evenly, and then the mixture is slowly added to 527kg of water under stirring conditions, and after stirring for 30 minutes, the temporary plugging agent for fracturing can be obtained. This temporary plugging agent can withstand a pressure difference of 45.3MPa after waiting for 4 hours in the wellbore at 45°C. After the gel is broken, the viscosity of the gel-breaking fluid is less th...

Embodiment 2

[0017] A temporary plugging agent for fracturing, its components and parts by weight are: 38 parts of hydroxypropyl cellulose, 15 parts of polyvinyl butyral, 16.5 parts of zinc oxide, 27 parts of urea-formaldehyde resin, hexamethylene 6 parts of base tetraammonium, 14 parts of calcium hypochlorite.

[0018] The preparation method of temporary plugging agent for fracturing is as follows: 38kg of hydroxypropyl cellulose, 15kg of polyvinyl butyral, 16.5kg of zinc oxide, 27kg of urea-formaldehyde resin, hexamethylene tetraammonium 6kg and 14kg of calcium hypochlorite are mixed evenly, and then the mixture is slowly added to 497kg of water under stirring conditions, and after stirring for 30 minutes, the temporary plugging agent for fracturing can be obtained. This temporary plugging agent can withstand a pressure difference of 40.6MPa after waiting for 2 hours in the wellbore at 60°C. After the gel is broken, the viscosity of the gel-breaking fluid is less than 5mPa·S, and it can ...

Embodiment 3

[0020] A temporary plugging agent for fracturing, its components and parts by weight are: 40 parts of hydroxypropyl cellulose, 20 parts of polyvinyl butyral, 18 parts of zinc oxide, 33 parts of urea-formaldehyde resin, hexamethylene 8 parts of base tetraammonium, 18 parts of calcium hypochlorite.

[0021] The preparation method of temporary plugging agent for fracturing is as follows: 40kg of hydroxypropyl cellulose, 20kg of polyvinyl butyral, 18kg of zinc oxide, 33kg of urea-formaldehyde resin, and 8kg of hexamethylene tetraammonium are mixed at room temperature at 25°C. Mix evenly with 18kg of calcium hypochlorite, then slowly add the mixture into 459kg of water under stirring conditions, and stir for 30 minutes to obtain a temporary plugging agent for fracturing. This temporary plugging agent can withstand a pressure difference of 31.9MPa after waiting for 4 hours in the wellbore at 90°C. After the gel is broken, the viscosity of the gel-breaking fluid is less than 5mPa·S, ...

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Abstract

The invention belongs to the technical field of oil field production, and specifically relates to an in-slot temporary plugging agent for fracturing and a preparation method thereof. The temporary plugging agent comprises the following components (by weight): 38 parts of hydroxypropyl cellulose, 15 parts of polyvinyl butyral, 16.5 parts of zinc oxide, 27 parts of urea-formaldehyde resin, 6 parts of hexamethylenetetramine and 14 parts of calcium hypochlorite. The preparation method comprises the following steps: uniformly mixing hydroxypropyl cellulose, polyvinyl butyral, zinc oxide, urea-formaldehyde resin, hexamethylenetetramine and calcium hypochlorite at normal temperature of 25 DEG C, and then slowly adding the mixture into water under the condition of stirring, and stirring for 30 minto obtain the in-slot temporary plugging agent for fracturing. After 2 h of waiting on cement setting in a shaft of 60 DEG C, the temporary plugging agent can withstand a pressure difference of 40.6MPa. After gel breaking, the viscosity of the gel breaking liquid is less than 5 mPa.S, and all the gel breaking liquid can be discharged to the ground through a backflow process.

Description

Technical field: [0001] The invention belongs to the technical field of oilfield production, and in particular relates to a temporary plugging agent for fracturing and a preparation method thereof. Background technique: [0002] With the continuous development of oil and gas resources in my country, the geological conditions of reservoirs are becoming more and more complex, and the difficulty of exploitation is also increasing. In recent years, for reservoirs with strong heterogeneity, low permeability, and ultra-low permeability, in order to further improve the stimulation efficiency and achieve uniform stimulation, the temporary plugging and diversion technology has been proposed, which is to add temporary plugging and diversion in real time during the hydraulic fracturing process. It can temporarily plug the artificial fractures that have been formed, force the fractures to crack and expand in other directions, and open new fractures under high pressure to increase the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/508
CPCC09K8/508C09K8/514
Inventor 孙安顺
Owner DAQING HUAYING CHEM IND
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