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Downhole tool member and manufacturing method for same

A technology for downhole tools and manufacturing methods, which is applied to wellbore/well parts, household components, household appliances, etc., can solve problems such as cracks and deformation, and achieve the effects of improving reliability, easy processing, and reducing cracks

Inactive Publication Date: 2020-04-21
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that when a three-dimensional molded product using the above-mentioned high molecular weight and high melt viscosity polyglycolic acid resin composition is directly molded by injection molding, deformation, cracks, etc. will occur.

Method used

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  • Downhole tool member and manufacturing method for same
  • Downhole tool member and manufacturing method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] With respect to 98 parts by mass of polyglycolic acid (PGA, "Kuredux" manufactured by Kureha Co., Ltd., weight average molecular weight (Mw): 241000), 3,3'4,4'-benzophenone tetracarboxylic acid as a carboxylic anhydride is blended 2 parts by mass of acid dianhydride (BTDA) (manufactured by Evonik Degussa Co., Ltd.), and a mixture of distearyl phosphate and monostearyl phosphate as a phosphorus compound ("ADK STAB AX-71" manufactured by ADEKA Co., Ltd.). It is supplied to the feed section of a twin-screw extruder kneader ("2D25S" manufactured by Toyo Seiki Co., Ltd.) whose screw section temperature is set to 200-240°C for melt kneading to obtain a pelletized polyglycolic acid resin composition Things. It should be noted that the content of the phosphorus compound is 900 ppm based on the total amount of the polyglycolic acid resin composition.

[0098] The weight average molecular weight of the polyglycolic acid resin composition is 226,000, and the temperature is 270°C and...

Embodiment 2

[0105] With respect to 99 parts by mass of polyglycolic acid, 1 part by mass of BTDA as a carboxylic anhydride was blended, and "ADK STAB AX-71" as a phosphorus compound was blended so as to be 1400 ppm, and pellets were obtained in the same manner as in Example 1 except that Shaped polyglycolic acid resin composition.

[0106] The weight average molecular weight of the polyglycolic acid resin composition is 197000, and the temperature is 270℃ and the shear speed is 122sec. -1 The melt viscosity measured below was 340 Pa·s. Therefore, the melt viscosity of the polyglycolic acid resin composition satisfies the relationship between (Formula 1) and (Formula 2) described above. Using the pellets of the polyglycolic acid resin composition, in the same manner as in Example 1, a round rod-shaped polyglycolic acid cured extruded product was obtained.

[0107] A thick cylindrical test piece was cut out from the obtained round bar, and the 23°C compressive strength was measured. As a result...

Embodiment 3

[0110] With respect to 97 parts by mass of polyglycolic acid, 3 parts by mass of BTDA as a carboxylic anhydride was blended, and "ADK STAB AX-71" as a phosphorus compound was blended so as to be 1400 ppm, and pellets were obtained in the same manner as in Example 1. Shaped polyglycolic acid resin composition.

[0111] The weight average molecular weight of the polyglycolic acid resin composition is 200,000, and the temperature is 270°C and the shear speed is 122 sec. -1 The melt viscosity measured below was 395 Pa·s. Therefore, the melt viscosity of the polyglycolic acid resin composition satisfies the relationship between (Formula 1) and (Formula 2) described above.

[0112] Using the pellets of the polyglycolic acid resin composition, in the same manner as in Example 1, a round rod-shaped polyglycolic acid cured extruded product was obtained. A thick cylindrical test piece was cut out from the obtained round bar, and the 23°C compressive strength was measured. As a result, it wa...

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Abstract

Provided is a downhole tool member containing a polyglycolic acid resin composition, which is easily processed during extrusion molding or injection molding, is less prone to cracking during cutting and transporting, and has sufficient strength in a high temperature environment well. This downhole tool member contains a polyglycolic acid resin composition that has a weight-average molecular weightMw of 150,000 to 300,000, inclusive, and that has a melt viscosity Mv (Pa*s), as measured at a temperature of 270 DEG C and a shear rate of 122 sec<-1>, satisfying Mv < 6.2*10<-15>*Mw<3.2>.

Description

Technical field [0001] The present invention mainly relates to a polyglycolic acid resin composition suitable for forming downhole tool components and a molded product thereof and a manufacturing method thereof. Background technique [0002] As a material for downhole tool components, a polyglycolic acid resin composition is known. In particular, downhole tool components such as frac plugs used in hydraulic fracturing require high strength, and therefore high strength is also required for their components. [0003] International Publication No. 2014 / 192885 (Patent Document 1) discloses a polyglycolic acid resin composition of high molecular weight and high melt viscosity as a material for obtaining such a high-strength downhole tool member. [0004] In addition, mechanical parts including downhole tool components usually have three-dimensional shapes and complex shapes. When a molded product with a three-dimensional shape and a complicated shape is manufactured from a resin materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12C08L67/04
CPCB29C48/256C08K5/09C08K5/521E21B33/1292C08L67/04B29C45/0001B29K2067/043B29L2031/26B29C48/022E21B33/128E21B33/1293
Inventor 小林卓磨小林史典西条光斎藤瑞辉吉田博明
Owner KUREHA KAGAKU KOGYO KK