Degradable fiber for use in well treatment fluid, method for manufacturing same, and well treatment method

Patent metadata

Field	Value
Publication number	US-2016102244-A1
Application number	US-201414894635-A
Country	US
Kind code	A1
Filing date	May 30, 2014
Priority date	Jun 3, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

A fiber formed from a resin that degrades in treatment fluid for hydrocarbon resource recovery, an oligomer component content of a resin forming an outer surface of the fiber being not greater than 1 mass %, and a birefringence of the fiber being not less than 0.02; a method for manufacturing a degradable fiber for use in well treatment fluid, the oligomer component content of a resin that forms an outer surface of an undrawn yarn obtained in a spinning step being not greater than 1 mass %, and a birefringence of a drawn yarn before heat treatment in a drawing step being not less than 0.02; and a well treatment method using the well treatment fluid containing the degradable fiber for use in well treatment fluid and a proppant.

First claim

1 . A degradable fiber for use in well treatment fluid, formed from a resin that degrades in a treatment fluid for hydrocarbon resource recovery,
an oligomer component content of a resin forming an outer surface of the fiber being not greater than 1 mass %, and a birefringence of the fiber being not less than 0.02.

2 . The degradable fiber for use in well treatment fluid according to claim 1 , wherein the fiber is dispersed in a single-fiber state in a treatment fluid for hydrocarbon resource recovery.

3 . The degradable fiber for use in well treatment fluid according to claim 1 , wherein a fineness is from 0.1 to 20 denier, and a fiber length is from 0.3 to 100 mm.

4 . The degradable fiber for use in well treatment fluid according to claim 1 , wherein the fiber is a composite fiber.

5 . The degradable fiber for use in well treatment fluid according to claim 3 , wherein the fiber is a composite fiber.

6 . The degradable fiber for use in well treatment fluid according to claim 1 , wherein the resin that degrades in a treatment fluid for hydrocarbon resource recovery contains an aliphatic polyester.

7 . The degradable fiber for use in well treatment fluid according to claim 2 , wherein the resin that degrades in a treatment fluid for hydrocarbon resource recovery contains an aliphatic polyester.

8 . The degradable fiber for use in well treatment fluid according to claim 3 , wherein the resin that degrades in a treatment fluid for hydrocarbon resource recovery contains an aliphatic polyester.

9 . The degradable fiber for use in well treatment fluid according to claim 4 , wherein the resin that degrades in a treatment fluid for hydrocarbon resource recovery contains an aliphatic polyester.

10 . The degradable fiber for use in well treatment fluid according to claim 5 , wherein the resin that degrades in a treatment fluid for hydrocarbon resource recovery contains an aliphatic polyester.

11 . A method for manufacturing a degradable fiber for use in well treatment fluid in which the fiber is formed from a resin that degrades in treatment fluid for hydrocarbon resource recovery, an oligomer component content of a resin forming an outer surface of the fiber is not greater than 1 mass %, and a birefringence of the fiber is not less than 0.02, comprising a spinning step and a drawing step, the oligomer component content of a resin that forms an outer surface of an undrawn yarn obtained in the spinning step being not greater than 1 mass %, and a birefringence of a drawn yarn before heat treatment in the drawing step being not less than 0.02.

12 . A well treatment method using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the fiber being formed from a resin that degrades in treatment fluid for hydrocarbon resource recovery, an oligomer component content of a resin forming an outer surface of the fiber being not greater than 1 mass %, and a birefringence of the fiber being not less than 0.02.

13 . The well treatment method according to claim 12 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the degradable fiber for use in well treatment fluid being dispersed in a single-fiber state in a treatment fluid for hydrocarbon resource recovery.

14 . The well treatment method according to claim 12 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the degradable fiber for use in well treatment fluid having a fineness of 0.1 to 20 denier and a fiber length of 0.3 to 100 mm.

15 . The well treatment method according to claim 12 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the degradable fiber for use in well treatment fluid being a composite fiber.

16 . The well treatment method according to claim 14 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the degradable fiber for use in well treatment fluid being a composite fiber.

17 . The well treatment method according to claim 12 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the resin that degrades in a treatment fluid for hydrocarbon resource recovery containing an aliphatic polyester.

18 . The well treatment method according to claim 13 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the resin that degrades in a treatment fluid for hydrocarbon resource recovery containing an aliphatic polyester.

19 . The well treatment method according to claim 14 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the resin that degrades in a treatment fluid for hydrocarbon resource recovery containing an aliphatic polyester.

20 . The well treatment method according to claim 15 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the resin that degrades in a treatment fluid for hydrocarbon resource recovery containing an aliphatic polyester.

21 . The well treatment method according to claim 16 , using a well treatment fluid containing a degradable fiber for use in well treatment fluid and a proppant, the resin that degrades in a treatment fluid for hydrocarbon resource recovery containing an aliphatic polyester.

Assignees

• Kureha Corp

Inventors

• Takahashi Takeo
• Saijo Hikaru
• Saito Mizuki

Classifications

• C09K8/035

  Organic additives · CPC title

• C09K2208/08

  Fiber-containing well treatment fluids · CPC title

• D01F6/92

  of polyesters · CPC title

• C08G63/16

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title