Downhole tool or downhole tool member, degradable resin composition, and method for recovering hydrocarbon resource

Patent metadata

Field	Value
Publication number	US-2016290083-A1
Application number	US-201415037841-A
Country	US
Kind code	A1
Filing date	Dec 22, 2014
Priority date	Dec 26, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A downhole tool or a member thereof, preferably a ball sealer, a ball seat, a frac plug or a bridge plug, comprising a degradable resin composition containing a degradable resin and a toughness enhancing agent, in which the degradable resin composition has an izod impact strength (unnotched) of 1,000 J/m or more, a tensile elongation of 3% or more, and a tensile strength of 30 MPa or more; a degradable resin composition for a downhole tool (member) containing 60 to 99.9 mass % of the degradable resin and 0.1 to 40 mass % of the toughness enhancing agent; and a method for recovering a hydrocarbon resource using the downhole tool (member).

First claim

1 . A downhole tool or a downhole tool member comprising a degradable resin composition containing a degradable resin and a toughness enhancing agent,
the degradable resin composition having an izod impact strength (unnotched) of 1,000 J/m or more, a tensile elongation of 3% or more, and a tensile strength of 30 MPa or more.

2 . The downhole tool or downhole tool member according to claim 1 ,
wherein, the downhole tool or downhole tool member contains a degradable resin composition containing 60 to 99.9 mass % of the degradable resin and 0.1 to 40 mass % of the toughness enhancing agent when a total of the degradable resin and the toughness enhancing agent is set as 100 mass %.

3 . The downhole tool or downhole tool member according to claim 1 ,
further comprising a chain extender wherein, the downhole tool or downhole tool member contains a degradable resin composition containing 60 mass % or more and less than 98.8 mass % of the degradable resin, more than 1 mass % and 37 mass % or less of the toughness enhancing agent, and 0.2 mass % or more and 3 mass % or less of the chain extender when a total of the degradable resin, the toughness enhancing agent and the chain extender is set as 100 mass %.

4 . The downhole tool or downhole tool member according to claim 1 ,
further comprising a reinforcing material, wherein, the downhole tool or downhole tool member contains a degradable resin composition containing 60 mass % or more and less than 94 mass % of the degradable resin, more than 1 mass % and 30 mass % or less of the toughness enhancing agent, and 5 mass % or more and 39 mass % or less of the reinforcing material when a total of the degradable resin, the toughness enhancing agent and the reinforcing material is set as 100 mass %.

5 . The downhole tool or downhole tool member according to claim 1 ,
wherein the downhole tool or downhole tool member is selected from the group consisting of a ball sealer, a ball seat, a frac plug and a bridge plug.

6 . A degradable resin composition for a downhole tool or a downhole tool member, the degradable resin composition comprising 60 to 99.9 mass % of a degradable resin and 0.1 to 40 mass % of a toughness enhancing agent when a total of the degradable resin and the toughness enhancing agent is set as 100 mass %,
the degradable resin composition having an izod impact strength (unnotched) of 1,000 J/m or more, a tensile elongation of 3% or more, and a tensile strength of 30 MPa or more.

7 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 6 ,
wherein the degradable resin is an aliphatic polyester.

8 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 6 ,
wherein the degradable resin is a polyglycolic acid.

9 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 6 ,
wherein the toughness enhancing agent contains a thermoplastic elastomer.

10 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 9 ,
wherein the thermoplastic elastomer is a thermoplastic polyester elastomer.

11 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 10 ,
wherein the thermoplastic polyester elastomer is a polyester-polyether block copolymer or an aromatic polyester-aliphatic polyester block copolymer.

12 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 6 ,
further comprising a chain extender wherein, the degradable resin composition for a downhole tool or a downhole tool member contains 60 mass % or more and less than 98.8 mass % of the degradable resin, more than 1 mass % and 37 mass % or less of the toughness enhancing agent, and 0.2 mass % or more and 3 mass % or less of the chain extender when a total of the degradable resin, the toughness enhancing agent and the chain extender is set as 100 mass %.

13 . The degradable resin composition for a downhole tool or a downhole tool member according to claim 6 ,
further comprising a reinforcing material, wherein the degradable resin composition for a downhole tool or a downhole tool member contains 60 mass % or more and less than 94 mass % of the degradable resin, more than 1 mass % and 30 mass % or less of the toughness enhancing agent, and 5 mass % or more and 39 mass % or less of the reinforcing material when a total of the degradable resin, the toughness enhancing agent and the reinforcing material is set as 100 mass %.

14 . A method for recovering a hydrocarbon resource using the downhole tool or downhole tool member according to claim 1 .

Assignees

• Kureha Corp

Inventors

• Takahashi Takeo
• Okura Masayuki
• Saijo Hikaru
• Watanabe Takahiro
• Sato Hiroyuki

Classifications

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• C08G18/7642

  containing at least two isocyanate or isothiocyanate groups linked to the aromatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate groups, e.g. xylylene diisocyanate or homologues substituted on the aromatic ring · CPC title

• E21B33/134

  Bridging plugs · CPC title

• C08G2230/00

  Compositions for preparing biodegradable polymers · CPC title

• E21B33/12

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title