초록 ▼

A stabilizer for driving and radially stabilizing a drill bit. The stabilizer has a fluid passage therethrough for passage of drilling fluid to the drill bit. The stabilizer includes radially extendable wedge-like members for stabilizing abutment thereof with a borehole wall; means affected by drill

A stabilizer for driving and radially stabilizing a drill bit. The stabilizer has a fluid passage therethrough for passage of drilling fluid to the drill bit. The stabilizer includes radially extendable wedge-like members for stabilizing abutment thereof with a borehole wall; means affected by drilling fluid pressure or spring tension for controlling extension and retraction of the wedge-like members; and, inclined slide surfaces for frictional interaction with the wedge-like members to prevent radial movement of said stabilizer relative to a borehole.

대표청구항 ▼

A drill but stabilizer comprising; a main body having a central axis, means by which the upper end of said main body can be attached to a driving means; means at a lower end of said main body forming a drill bit; a throat formed through said main body for passage of drilling fluid therethrough and t

A drill but stabilizer comprising; a main body having a central axis, means by which the upper end of said main body can be attached to a driving means; means at a lower end of said main body forming a drill bit; a throat formed through said main body for passage of drilling fluid therethrough and to the face of a bit that may be attached thereto; means forming an inclined slide surface on said main body, radially active stabilizing means slidably and guidably mounted to said inclined slide surface for radially stabilizing said main body relative to a borehole; a plunger; means by which said plunger is arranged diagonally relative to the central axis of said main body; said plunger being positioned in said main body for engaging and applying an outward directed force on said radially active stabilizing means to thereby move said radially active stabilizing means into any one of a range of different extended positions; and blocking means including and radially active stabilizing means and said inclined slide surface for frictional interaction with one another to selectively prevent inward radial movement of said radially active stabilizing means from any of said extended positions upon application of a radially directed force on said main body that is opposed to outward movement of said radially active stabilizing means sufficient to displace said outward force.