Choke for controlling the flow of drilling mud

a technology of drilling mud and choke, which is applied in the direction of drilling pipes, wellbore/well accessories, sealing/packing, etc., can solve the problem of compromising the correct control of the pressure in the wellbor

Inactive Publication Date: 2007-10-18
SMITH INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] It is an object of the invention to alleviate the disadvantages of the prior art and to provide a syste

Problems solved by technology

However due to large rock debris or contaminated mud, the safety choke could get clogged

Method used

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  • Choke for controlling the flow of drilling mud
  • Choke for controlling the flow of drilling mud
  • Choke for controlling the flow of drilling mud

Examples

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Embodiment Construction

[0022] Described is a drilling system comprising an drilling fluid outlet system that comprises choke means for choking the returned flow of retrieved drilling fluid and alternating means for alternating the flow direction through the choke means.

[0023] So if the choke means would get clogged, the returned flow is alternated, such that the choke means are cleaned and the debris is discharged.

[0024] According to a preferred embodiment, the drilling fluid outlet system comprises an inlet and an outlet, the choke means comprise a first inlet / outlet connection, a second outlet / inlet connection and the alternating means connect the inlet alternatingly to the first or second connection and the outlet alternatingly to the second or first connection. So with these alternating means it is possible to connect the choke means such that the inlet is used as an inlet or outlet and that at the same time the outlet is used as outlet or inlet.

[0025] In another embodiment of the drilling system a...

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Abstract

A drilling system and method for drilling a well bore in to an earth formation is provided with drilling means for drilling a well bore and pumping means for pumping drilling fluid into the wellbore during drilling. Also provided is a drilling outlet system for retrieving drilling fluid from the well bore. The drilling fluid outlet system has choke means for choking the return flow of retrieved drilling fluid, and alternating means for alternating the flow direction through the choking means.

Description

CROSS REFERENCE TO EARLIER APPICATION [0001] The present application is a continuation application of U.S. application Ser. No. 10 / 520,606 filed 6 Jan. 2005, which is a national stage application of International application No. PCT / EP2003 / 006750, which claims priority on European Patent Application 02254746.7 filed 8 Jul. 2002.BACKGROUND OF THE INVENTION [0002] The present invention is related to a drilling system, more particularly, a system for controlling formation pressure while drilling. [0003] According to prior art systems, the pressure is controlled by pumping fluid into the bore hole, via the annulus. Such a drilling fluid outlet system could further comprise a safety choke, in case the pump fails. [0004] However due to large rock debris or contaminated mud, the safety choke could get clogged or could be damaged, which jeopardises correct control over the pressure in the well bore. SUMMARY OF THE INVENTION [0005] The invention relates to a drilling system for drilling a we...

Claims

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Application Information

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IPC IPC(8): E21B21/01E21B21/10E21B21/08
CPCE21B21/106E21B21/08
Inventor VAN RIET, EGBERT JAN
Owner SMITH INT INC
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