Wellbore cleaning method and apparatus
AssigneeSpecialised Petroleum Services Group Limited
InventorGeorge Telfer
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Abstract
This invention relates to well cleaning methods and apparatus. In particular, this invention relates to a method of drilling and cleaning a wellbore. In one embodiment of the invention, a method of drilling and cleaning a wellbore (12) is disclosed. The method comprises the steps of providing a drill string (10) having a drill bit (28) and a cleaning tool (24) with selectively activatable cleaning members (34); drilling a wellbore using the drill bit while maintaining the cleaning members in a deactivated position; and pulling the drill string from the wellbore with the cleaning members in an activated position, to thereby clean the wellbore. A corresponding cleaning tool is also disclosed.
Claims41
1-17. (canceled)
A tool comprising:
- a body having a bore running therethrough;
- a sleeve located within the bore, the sleeve including a ball seat and the sleeve being biased in a first direction;
- and
- a plurality of cleaning members mounted for movement relative to the body between activated and deactivated positions;
- wherein location of a ball on the ball seat facilitates movement of the sleeve in a second direction opposite to said first direction, to in turn facilitate movement of the cleaning members to their activated positions where they contact a wellbore wall.
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A drill string comprising:
- a drill bit;
- and
- a downhole cleaning tool comprising a body having a bore running therethrough and an;
- a sleeve located within the bore, the sleeve including a ball seat and the sleeve being biased in a first direction;
- and
- a plurality of cleaning members mounted for movement relative to the body between activated and deactivated positions;
- wherein the sleeve further comprises an index sleeve rotatably mounted on the sleeve and the body comprises a matching index pin located through the body for coupling the sleeve to the body.
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A tool comprising:
- a substantially cylindrical body having a central bore running axially therethrough;
- a sleeve located within the bore and including a ball seat;
- a spring located between the sleeve and the body to bias the sleeve in a first direction;
- an actuating surface upon the sleeve to move a plurality of cleaning members between an activated and deactivated position with respect to the body;
- wherein upon insertion of a drop ball through the central bore in a reverse direction, the sleeve is moved against the spring such that the cleaning members are activated to extend from the body and contact an interior of a casing wall.
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Dependencies are inferred from the claim text.