CA2305253A1 - Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well - Google Patents

Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well Download PDF

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Publication number
CA2305253A1
CA2305253A1 CA002305253A CA2305253A CA2305253A1 CA 2305253 A1 CA2305253 A1 CA 2305253A1 CA 002305253 A CA002305253 A CA 002305253A CA 2305253 A CA2305253 A CA 2305253A CA 2305253 A1 CA2305253 A1 CA 2305253A1
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Canada
Prior art keywords
drilling
string
live well
dual string
drill
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CA002305253A
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French (fr)
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CA2305253C (en
Inventor
Robert Gardes
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Individual
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Individual
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Priority claimed from PCT/US1997/018486 external-priority patent/WO1999019595A1/en
Publication of CA2305253A1 publication Critical patent/CA2305253A1/en
Application granted granted Critical
Publication of CA2305253C publication Critical patent/CA2305253C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

A method and system (10) of drilling multiple radial wells (60) using underbalanced drilling, by first drilling a principal wellbore (16). There would then be provided a first carrier string (30) having a deflection member (50) on its lowermost end. There is then lowered a second drill string (12) that is deflected by the deflection member (50) from the principal wellbore (16). A second fluid is then pumped into an annular space between the second drill string (12) and the carrier string (30) to a position that it co-mingles with a first fluid. There is then provided a volume of fluid to establish an equilibrium within the carrier string (30). The direction of the deflection member (50) is reoriented to a second depth within the borehole. Finally, the drill string (12) and drill bit (46) is lowered to a second depth to drill a second radial well (60) while the well is alive and producing.
CA002305253A 1997-10-09 1997-10-09 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well Expired - Lifetime CA2305253C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1997/018486 WO1999019595A1 (en) 1996-02-01 1997-10-09 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well

Publications (2)

Publication Number Publication Date
CA2305253A1 true CA2305253A1 (en) 1999-04-22
CA2305253C CA2305253C (en) 2007-08-21

Family

ID=22261866

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002305253A Expired - Lifetime CA2305253C (en) 1997-10-09 1997-10-09 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well

Country Status (2)

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AU (1) AU4982797A (en)
CA (1) CA2305253C (en)

Also Published As

Publication number Publication date
AU4982797A (en) 1999-05-03
CA2305253C (en) 2007-08-21

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Effective date: 20171010