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Preparation method of slow-release rubber breaking agent for chemical temporary-plugging rubber plug

A gel breaker and gel plugging technology, which is applied in the field of slow-release gel breaker preparation, can solve the problems that horizontal wells cannot be separated, and hydraulic fracturing cannot be performed.

Inactive Publication Date: 2011-06-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydraulic fracturing technology is the most widely used production stimulation measure at home and abroad. Horizontal well fracturing has now become an important way to improve the comprehensive benefits of oilfield exploration and development. No hydraulic fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, grind 10 parts by weight of NaCl into powder, add 15-22.5 parts by weight of binder into 20-40L of alcohol and keep stirring to completely dissolve the binder, and the completely dissolved binder is pale yellow and transparent Liquid. Put 100 parts by weight of the gel breaker and 10 parts by weight of NaCl into the agitator at the same time so that the NaCl and the gel breaker are evenly mixed, and then gradually add the binder solution while stirring continuously, and continue stirring for about 20 minutes. Then the stirred raw material of the capsule core is made into granules. At this time, only the powdered gel breaker is made into round granules with a size of 20-40 meshes, and the capsule coating is to be wrapped in the next step.

[0024] With the prepared capsule core granules, take 3kg of prepared capsule core granules and put them into a boiling spray drying granulator, take 180g cellulose, 84g resin, 90ml o-phthalylene and 84g talcum powder and dissol...

Embodiment 2

[0026] Use the same method to prepare capsule core granules, then take 3kg of prepared capsule core granules and put them into a boiling spray drying granulator, and dissolve 180g cellulose, 84g resin number, 90ml o-phthalylene and 84g talcum powder into 5000ml Add the dissolved inner layer coating material to the boiling spray drying granulator, set the temperature at 50-70°C, after the inner layer coating solution is completely wrapped, continue to use chlorine-containing emulsion to continue to coat the outer layer. For wrapping, use 500ml and set the temperature at 35°C. This capsule is used in chemical temporary plugging rubber plugs. When the formation temperature is 60°C, the chemical temporary plugging rubber plugs can be gelled at 60°C and remain in a colloidal state for 6 hours. After 6 hours, the gel will break, and it will take 48 hours until the gel is completely broken.

Embodiment 3

[0028] Use the same method to prepare capsule core granules, then take 3kg of prepared capsule core granules and put them into a boiling spray-drying granulator, and dissolve 180g of cellulose, 84g of resin, 90ml of o-phthalylene and 84g of talcum powder into 5000ml of alcohol From medium to complete dissolution, add the dissolved inner layer coating material into the boiling spray drying granulator, set the temperature at 50-70°C, after the inner layer coating liquid is completely wrapped, continue to wrap the outer layer with chlorine-containing emulsion , about 400ml is used, the temperature is set at 35°C, and the spray speed can be adjusted according to the package situation. This capsule is used in chemical temporary plugging rubber plugs. When the formation temperature is 60°C, the chemical temporary plugging rubber plugs can be gelled at 60°C and remain in a colloidal state for 4 hours. After 4 hours, the gel will start to break, and it will take 48 hours until the gel ...

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Abstract

The invention relates to a preparation method of a slow-release rubber breaking agent for a chemical temporary-plugging rubber plug, which comprises the following steps: adding 10 parts by weight of NaCl, 15-22.5 parts by weight of adhesive and 20-40 parts by weight of alcohol into 100 parts by weight of strong oxidant rubber breaking agent to prepare 20-40-mesh granular capsule cores; applying an inner coating and an outer coating outside each capsule core, wherein the coating material for every kilogram of capsule cores comprises 90g of cellulose, 28g of resin IV, 30 ml of o-phenylenedimethylene, 2000-3000 ml of alcohol, 28g of talcum powder and 200-450 ml of vinyl chloride-vinylidene chloride copolymer emulsion. The high-efficiency oxidant in the rubber breaking agent can be gradually released at stratum temperature under the slow-release action according to the implementation requirements when the chemical temporary-plugging rubber plug liquid is injected into a well and in the fracturing construction process, so as to ensure the rubber forming and pressure bearing properties of the rubber plug, thereby completely breaking the rubber plug, effectively increasing the backflow rate of the chemical temporary-plugging rubber plug and maximally reducing the damage to the stratum.

Description

Technical field: [0001] The invention relates to a preparation method of a slow-release gel breaker which uses a strong oxidant as a chemical temporary plug gel breaker for staged fracturing of a horizontal well. Background technique: [0002] Hydraulic fracturing technology is the most widely used production stimulation measure at home and abroad. Horizontal well fracturing has now become an important way to improve the comprehensive benefits of oilfield exploration and development. Hydraulic fracturing cannot be performed. The chemical temporary plugging rubber plug containing gel breaker forms a rubber plug with certain elasticity in the well and can withstand higher pressure, and can successfully seal the perforation section that does not need fracturing to complete the fracturing construction. After the fracturing operation, the rubber plug can automatically break the rubber and flow back. It has the advantages of simple construction, no need to add sand to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60
Inventor 邱晓惠崔明月胥云管保山陈作崔伟香王丽伟刘玉婷
Owner PETROCHINA CO LTD
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