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Temporary plugging ball and manufacturing method and application thereof

A technology of temporary plugging balls and ball cores, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problem that temporary plugging agents cannot be ablated by themselves, and achieve good water solubility and good pressure resistance Effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem that the traditional temporary plugging element or temporary plugging agent cannot be ablated by itself, it is necessary to develop a fracturing diversion operation that can meet the needs of the downhole environment within a certain period of time, effectively plug the perforated blastholes in the fractured layer, and can be used in a given time. Temporary plugging agent technology that degrades or slowly dissolves due to physical or chemical effects within a short period of time

Method used

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  • Temporary plugging ball and manufacturing method and application thereof
  • Temporary plugging ball and manufacturing method and application thereof
  • Temporary plugging ball and manufacturing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: In the core-shell type temporary plugging ball in this embodiment, its shell layer 1 adopts the hardness of Shore 70A polyester type TPU, the main component of shell layer 2 is PBAT, and the core 3 components are low polymerization degree PVA (polymerization degree 500, degree of alcoholysis 50-75%, molecular weight 2.5-35,000); the diameter of the core 3 is 10 mm, and the core 3 is prepared by injection molding; the middle layer 2 is made of PBAT material, and the thickness is 3 mm. Put it into the mold, the mold temperature is room temperature, inject PBAT into the mold after plasticizing, and make a temporary plugging ball blank with a diameter of 16mm; the thickness of the shell layer 1 is 2mm, pre-set the temporary plugging ball blank into the mold, and the mold temperature is room temperature , Plasticize the TPU and inject it into the mold to finally make a temporary plugging ball with a diameter of 20mm.

Embodiment 2

[0031] Example 2: A core-shell temporary plugging ball composed of degradable or water-soluble polymer materials. The shell layer 1 is made of polyester TPU with a hardness of Shore 70A, the middle layer 2 is mainly composed of PLA, and the core 3 is a mixture of paper sand and dextrin; the diameter of the core 3 is 10 mm, and the core 3 is prepared by injection molding; the middle layer 2 is made of PLA material, and the thickness is 3 mm. The core 3 is preset into the mold, and the mold temperature At room temperature, PLA is plasticized and injected into the mold to obtain a temporary plugging ball with a diameter of 16mm; the thickness of the shell layer 1 is 2mm, the temporary plugging ball is preset into the mold, the temperature of the mold is room temperature, and the TPU is plasticized Inject into the mould, and finally make a temporary plugging ball with a diameter of 20mm.

Embodiment 3

[0032] Example 3: A core-shell temporary plugging ball composed of degradable or water-soluble polymer materials, the shell layer 1 is made of polyglycolic acid, the middle layer 2 is mainly composed of PBAT, and the core 3 is composed of low polymerization degree PVA mixture with fine wood chips; the diameter of the core 3 is 10 mm, and the core 3 is prepared by injection molding; the middle layer 2 is made of PBAT material, and the thickness is 2 mm. The core 3 is preset into the mold, and the temperature of the mold is room temperature. After plasticizing, inject into the mold to obtain a temporary plugging ball blank with a diameter of 14mm; the thickness of the shell layer 1 is 2mm, pre-set the temporary plugging ball blank into the mold, the temperature of the mold is room temperature, inject the polyglycolic acid into the mold after plasticizing, Finally, a temporary plugging ball with a diameter of 18 mm was obtained.

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Abstract

The invention discloses a temporary plugging ball, which comprises: a ball core, which is composed of a first material selected from one or more of water-soluble polyvinyl alcohol, wood chips, paper sand, bentonite, plastic soluble clay and a binder; the middle layer completely wraps the ball core and is composed of a second material, and the second material is selected from one or more of modified poly (butylene adipate-co-terephthalate) (PBAT), polylactic acid (PLA), polyester type thermoplastic polyurethane (TPU) and high-polymerization-degree polyvinyl alcohol (PVA); the shell layer completely covers the middle layer and is made of a third material, and the third material is selected from one or more of polyester type TPU, polyglycolic acid and modified starch.

Description

technical field [0001] The invention belongs to the technical field of downhole operations for oil field exploration, and in particular relates to a temporary plugging ball for fracturing diversion with a core-shell structure made of water-soluble materials and a preparation technology thereof, which are used for enhancing oil and gas recovery. Background technique [0002] During the continuous development of oil and gas reservoirs, it is necessary to perform staged fracturing on casing perforations in order to gradually and fully collect formation oil and gas energy. In order to avoid repeated fracturing, a staged, time-sharing, and directional fracturing technology has emerged in recent years, in which an adjustable temporary plugging agent material is used. Temporary plugging agent, mainly used in fracturing diversion operations, when it is necessary to segment or divert fracturing fractures in the well. The mechanism of this technology is to squeeze a part of the tempo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/514C09K8/516E21B33/12E21B43/26
CPCC09K8/516C09K8/5083C09K8/5086C09K8/514E21B33/12E21B43/261C09K2208/04
Inventor 刘奔魏辽阮臣良朱敏涛秦金立刘阳吴晋霞
Owner CHINA PETROLEUM & CHEM CORP