Global Patent Index - EP 1071731 A1

EP 1071731 A1 2001-01-31 - FLUID AND METHOD FOR RELEASING TUBULAR ELEMENTS STUCK IN A WELL

Title (en)

FLUID AND METHOD FOR RELEASING TUBULAR ELEMENTS STUCK IN A WELL

Title (de)

FLUIDUM UND METHODE ZUR BEFREIUNG FESTGESETZER BOHRSTÄNGE

Title (fr)

FLUIDE ET METHODE POUR LIBERER DES ELEMENTS TUBULAIRES COINCES DANS UN PUITS

Publication

EP 1071731 A1 (FR)

Application

EP 99900942 A

Priority

  • FR 9900082 W
  • FR 9801118 A

Abstract (en)

[origin: FR2773816A1] The composition of the invention aids the release of jammed drilling elements resulting from an interaction with the colloidal deposits on the walls during an arrest in rotation. It is particularly applicable to water-based drilling fluids. A new fluid composition for well drilling formulated to release jammed tubular elements consisting of the components: (1) A part A comprising one or more esters obtained by reaction of an 8 - 24C monocarboxylic acid (A1) and a 2-20C polyol (A2). The molar ratio of A1 : A2 is between 1 : 1 and (n - n/10) : 1, where n is the number of OH groups in A2; (2) A part B comprising one or more 8-24C monocarboxylic acids, the acid A1 and part B being, each separately, a mixture of at least 80% of carboxylic acids with 1 - 3 unsaturations; (3) A part C comprising one or more esters from the reaction of a 2-24C monocarboxylic acid with a 2-24C monoalcohol, or one or more linear hydrocarbons with at least one unsaturation or saturated branched hydrocarbons (optionally with at least one unsaturation). C had a viscosity less than 10mPa.s. at 40 deg C; and (4) Optionally a part D comprising a tertiary amine. The amount of C is determined, relative to the other components, so that the viscosity of the fluid composition is less than 40 mPa.s. at 40 deg C. An Independent claim is also included for the method in which the fluid is incorporated to enable the release of jammed tubes.

IPC 1-7 (main, further and additional classification)

C09K 7/00; C09K 7/06; E21B 31/03

IPC 8 full level (invention and additional information)

C09K 8/02 (2006.01); C09K 8/34 (2006.01); E21B 31/03 (2006.01)

CPC (invention and additional information)

E21B 31/03 (2013.01); C09K 8/02 (2013.01); C09K 8/34 (2013.01); C09K 2208/02 (2013.01); Y10S 507/94 (2013.01)

Citation (search report)

See references of WO 9936487A1

Designated contracting state (EPC)

DE DK FR GB IE IT NL

EPO simple patent family

FR 2773816 A1 19990723; FR 2773816 B1 20010504; CA 2318341 A1 19990722; EP 1071731 A1 20010131; GB 0016520 D0 20000823; GB 2350120 A 20001122; GB 2350120 B 20020403; NO 20003670 A 20000913; NO 20003670 D0 20000718; US 6537951 B1 20030325; WO 9936487 A1 19990722

INPADOC legal status


2004-06-23 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20031217

2002-04-10 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: INSTITUT FRANCAIS DU PETROLE

2002-04-10 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: OLEON NV

2001-08-16 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: INSTITUT FRANCAIS DU PETROLE

2001-08-16 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: ATOFINA RESEARCH

2001-05-23 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010405

2001-01-31 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000821

2001-01-31 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE DK FR GB IE IT NL