EP0586223A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of testing a production well and of perforating a new zone
Assignee: Halliburton Co
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Filing: 1993-08-31
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Granted: —
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Expires: 2013-08-31
Abstract
Abstract A new sub-surface zone 406 of an existing production well (10) is perforated by shutting down production of the well through a production tubing bore (32) and running a coiled tubing test string (400) down into the production tubing string (26). The coiled tubing test string includes a perforating gun (402) and optionally a test packer (54). The gun (402) is fired adjacent the new zone (406) to make perforations (408) therein, and the coiled tubing string (400) is removed and production resumed.
Inventors
- 👤 Roger L. Schultz
- 👤 Gary O. Harkins
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:29
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/087; E21B49/088; E21B43/00; E21B43/11; E21B43/116
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
257 words
A method of perforating a new subsurface zone of a production well (10), said well having a casing (18) set in a borehole (12) intersecting said new subsurface zone (406) and a pre-existing subsurface zone (404) said casing having a casing bore (22) and having pre-existing perforations (24) communicating said casing bore with said pre-existing subsurface zone, said well further having a production tubing string (26) received within said casing (18) and having a production tubing bore (32), and a production packer sealing between said casing bore (22) and said production tubing string (26) above said pre-existing perforations (24), said well having previously been on production by flowing well fluid from said pre-existing subsurface zone (16) through said pre-existing perforations (24) and through said production tubing bore (32), said method comprising: (a) shutting down production of said well through said production tubing bore (32); (b) leaving said production tubing string (26) in place in said well and running a coiled tubing test string (400) downward into said production tubing string, said coiled tubing test string including a coiled tubing s tring and a perforating gun (402) carried by said coiled tubing string; (c) placing said perforating gun (402) adjacent said new subsurface zone (406); (d) firing said perforating gun (402) and thereby forming new perforations (408) communicating said casing bore (22) with said new subsurface zone (406); (e) after step (d), removing said coiled tubing test string (400) from said production tubing (26); and (f) resuming production of said well up through said production tubing bore (32).
Claim 2
Dependent Claim
71 words
A method according to claim 1, wherein in step (b), said coiled tubing test string (400) further includes a test packer (54) carried by said coiled tubing string; and step (c) includes setting said test packer (54) within one of said casing bore (22) and said production tubing bore (32) above said subsurface zone, with said perforating gun (402) located below said test packer (54) adjacent said new subsurface zone (406).
Claim 3
Dependent Claim
81 words
A method according to claim 2, wherein the test packer (54) is a straddle packer having upper (56) and lower (58) packer elements, and said perforating gun (402) is located between said upper and lower packer elements; and step (c) includes setting said straddle packer (54) in said casing bore (22) with said upper (56) and lower (58) packer elements above and below said new subsurface zone (406), respectively, thereby isolating said new subsurface zone from said pre-existing subsurface zone (404).
Claim 4
Dependent Claim
43 words
A method according to claim 2, wherein step (c) includes setting said test packer (54) in said production tubing bore (32) with said perforating gun (402) located below said production tubing (26) within said casing bore (22) adjacent said new subsurface zone (406).
Claim 5
Dependent Claim
19 words
A method according to claim 4, wherein in step (b), said test packer is a compression set test packer.
Claim 6
Dependent Claim
65 words
A method according to claim 2, wherein in step (b), said coiled tubing test string (400) includes a bridge plug carried by said coiled tubing test string below said perforating gun (402); and between steps (b) and (c), said bridge plug is set to block said casing bore (22) below said new subsurface zone (406) and then released from said coiled tubing test string (400).
References Cited (Backward Citations)
No citation records indexed.
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