Wells – Processes – Placing or shifting well part
Reexamination Certificate
2002-01-22
2004-06-08
Walker, Zakiya (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S205000, C166S233000, C166S234000, C166S296000
Reexamination Certificate
active
06745843
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates generally to flow control in downhole completions. Specifically, this invention relates to the control of flow along the length of a horizontal downhole completion.
2. Related Art
Within the oil and gas industry, it is now fairly common to include lateral well bores that extend at an angle from a main vertical well bore. In some cases, the lateral well bores extend in a substantially horizontal direction from the main well bore.
A completion is typically deployed within such lateral well bores. The completion may include sliding sleeves, packers, and sand control equipment. Essentially, hydrocarbons flow from the formation intersected by the lateral well bore, into the lateral well bore, into the completion, and to the surface through the completion and associated tubing string.
However, in lateral well bores, specially those extending in a substantially horizontal direction, the flow rate into the completion is not equal along the length of the completion. Instead, due to the flow friction along the length of the completion, a higher flow rate tends to exist at the near end or “heel” of the lateral completion, and a lower flow rate tends to exist at the far end or “toe” of the lateral completion. The disparity in flow rate from the “toe” to the “heel” of the lateral completion, in turn, may lead to premature gas or water coning at the area of higher flow rate and/or may also decrease the total amount of hydrocarbons extracted from the relevant formation.
The prior art would therefore benefit from a system and method for equalizing the flow rate along a lateral completion.
SUMMARY OF THE INVENTION
The present invention uses an innovative design for a completion assembly for use in a lateral well bore having a base pipe with a plurality of holes through the sidewall of the base pipe. Flow through the holes is regulated to produce an influx difference between the ends of the base pipe. Flow can be regulated by variably spacing or sizing the holes. Flow can also be regulated by selectively inserting a rod between adjacent splines located on the base pipe to cover and block the flow through certain holes in the base pipe. Flow can also be regulated using a rotatable sleeve circumferentially adjacent to the base pipe such that rotation of the sleeve brings the holes and openings in the pipe and sleeve, respectively, into and out of alignment. A filter can be used to filter sand and other particulates. An erosion inhibitor can be used to extend the useful life of the assembly.
REFERENCES:
patent: 3584685 (1971-06-01), Boyd et al.
patent: 4428423 (1984-01-01), Koehler et al.
patent: 5152892 (1992-10-01), Chambers
patent: 5355948 (1994-10-01), Sparlin et al.
patent: 5355949 (1994-10-01), Sparlin et al.
patent: 5394938 (1995-03-01), Cornette et al.
patent: 5476143 (1995-12-01), Sparlin et al.
patent: 5787980 (1998-08-01), Sparlin et al.
patent: 5829522 (1998-11-01), Ross et al.
patent: 5842516 (1998-12-01), Jones
patent: 5849188 (1998-12-01), Voll et al.
patent: 5881809 (1999-03-01), Gillespie et al.
patent: 5899271 (1999-05-01), Simone et al.
patent: 5909773 (1999-06-01), Koehler et al.
patent: 5938925 (1999-08-01), Hamid et al.
patent: 5980745 (1999-11-01), Voll et al.
patent: 6089316 (2000-07-01), Spray
patent: 6125932 (2000-10-01), Hamid et al.
patent: 6345668 (2002-02-01), Reilly
patent: 6457518 (2002-10-01), Castano-Mears et al.
patent: 6481494 (2002-11-01), Dusterhoft et al.
patent: 2 371 319 (2002-07-01), None
Hackworth Matthew R.
Johnson Craig D.
Wang David W.
Echols Brigitte Jeffery
Griffin Jeffrey E.
Schlumberger Technology Corporation
Walker Zakiya
Williams Morgan & Amerson P.C.
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