Spiralling tapered slip-on drill string stabilizer

Claim 2

A stabilizer for use in a drilling string characterized in that: a substantially cylindrical body member having a central passageway to accommodate the drill string, the inside surface of the body member defining a right-hand spiralling thread with a tapered trailing edge which spirals from a starting point on said body member, said thread terminating internally of said body member in an arcuate recess extending around the interior of said body member; a key member is secured to the inner wall surface of said recess of said body member, said key member having a lug extending longitudinally of said body member within said recess. a slip member adapted to thread within the body member between said body member and said drill string, the slip defining a right-hand thread with a matching tapered trailing edge configured to make up with said right-hand thread on said body member, one end of said slip terminating in a longitudinally disposed shoulder capable of abutting said lug upon threading of said slip within said body member.

Claim 3

The stabilizer of claim 1 characterized in that said slip member is an integral basket-like member.

Claim 4

The stabilizer of claim 2 characterized in that the basket-like slip member has a longitudinal slot extending from the bottom of slip member to the top of slip member.

Claim 5

The stabilizer of claim 3 characterized in that the basket-like slip member has partial longitudinal slots disposed about the circumference of the slip member.

Claim 6

The stabilizer of claim 1 characterized in that said slip member is a coil-type member.

Claim 7

c 6. The stabilizer of claim 1 characterized in that the slip member and body have a single start thread.

Claim 8

The stabilizer of claim 1 characterized in that the right-hand spiralling thread on the stabilizer body has a leading edge substantially at right angles to the longitudinal axis of the body and a sloped or tapered trailing edge sloping away from said leading edge.

Claim 9

A stabilizer for use in a drilling string characterized in that: a substantially cylindrical body member having a central passageway to accommodate the drill string, said member defined by an upper inside surface and a lower inside surface; the upper inside surface of the body member defining a left-hand spiralling thread with a tapered trailing edge which spirals from the top of the upper inside surface towards the center of said body member, said left-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; the lower inside surface of the body member defining a right-hand spiralling thread with a tapered trailing edge which spirals from the bottom of the lower inside surface towards the center of said body member, said right-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; c the arcuate recess in the center portion of the cylindrical body separating the terminus of the left-hand spiralling thread from the terminus of the right-hand spiralling thread; a key member secured to the inner wall surface of said recess of said body member, said key member having a lug extending downward and a lug extending upward, said lugs extending longitudinally within said body member within said recess and with the lower lug interrupting the right-hand spiralling thread and the upper lug interrupting the left-hand spiralling threat at the terminus of each thread; an upper slip member adapted to spirally thread within the upper end of said body member between said body member and said drill string, the slip defines a left-hand spiralling thread, configured to make up with said left-hand spiralling thread on said body member, the lower end of said slip terminating in a longitudinally disposed shoulder capable of abutting said upper lug upon threading of said slip within said body member; a lower slip member adapted to spirally thread within the lower end of said body member between said body member and said drill string, the slip defines a right-hand spiralling thread, configured to make up with said right-hand spiralling thread on said body member, the upper end of said slip terminating in a longitudinally disposed shoulder capable of abutting said lower lug upon threading of said slip within said body member.

Claim 10

A stabilizer for use in a drilling string characterized in that: a substantially cylindrical body member having a central passageway to accommodate the drill string, said member defined by an upper inside surface and a lower inside surface; the upper inside surface of the body member defining a left-hand spiralling thread with a tapered trailing edge which spirals from the top of the upper inside surface towards the center of said body member, said left-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; the lower inside surface of the body member defining a right-hand spiralling thread with a tapered trailing edge which spirals from the bottom of the lower inside surface towards the center of said body member, said right-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; c the arcuate recess in the center portion of the cylindrical body separating the terminus of the left-hand spiralling thread from the terminus of the right-hand spiralling thread; a key member secured to the inner wall surface of said recess of said body member, said key member having a lug extending downward and a lug extending upward, said lugs extending longitudinally within said body member within said recess and with the lower lug interrupting the right-hand spiralling thread and the upper lug interrupting the left-hand spiralling threat at the terminus of each thread; an upper slip member adapted to spirally thread within the upper end of said body member between said body member and said drill string, the slip defines a left-hand spiralling thread, configured to make up with said left-hand spiralling thread on said body member, the lower end of said slip terminating in a longitudinally disposed shoulder capable of abutting said upper lug upon threading of said slip within said body member; a lower slip member adapted to spirally thread within the lower end of said body member between said body member and said drill string, the slip defines a right-hand spiralling thread, configured to make up with said right-hand spiralling thread on said body member, the upper end of said slip terminating in a longitudinally disposed shoulder capable of abutting said lower lug upon threading of said slip within said body member.

Claim 11

The stabilizer of claim 8 characterized in that said arcuate recess extends around the interior surface of said body member and said key member is attached to one of a plurality of segments of a ring-like structure, each said segment sized to fit within said recess around said drill string, the inner surface of each said segment defining an arcuate ring-shaped depression sized to receive a common ring member disposed transversely relative to the longitudinal axis of said body member.

Claim 12

The stabilizer of claim 8 characterized in that said slip members are integral basket-like members.

Claim 13

The stabilizer of claim 10 characterized in that each basket-like slip member has a longitudinal slot extending from the bottom of slip member to the top of slip member.

Claim 14

The stabilizer of claim 8 characterized in that each said slip member is a coil-type member.

Claim 15

The stabilizer of claim 8 characterized in that the slip member and body has at least a single start thread.

Claim 16

The stabilizer of claim 8 characterized in that the right-hand spiralling thread on the stabilizer body and the left-hand spiralling thread on the stabilizer body each have a leading edge substantially at right angles to the longitudinal axis of the body and a sloped or tapered trailing edge sloping away from the leading edge.

Claim 17

The stabilizer of claim 8 characterized in that the right-hand spiralling thread on the lower inside surface of the body mating with the right-hand spiralling thread on the lower slip member tightens the slip onto the collar as the collar is pulled upwards and where the left-hand spiralling thread on the upper inside surface of the body mating with the left-hand spiralling thread on the upper slip member tightens the slip onto the collar as the collar is pushed downwards.

Claim 18

A stabilizer for use in a drill string characterized in that: a substantially cylindrical body member having a central passageway to accommodate the drill string, said member defined by an upper inside surface and a lower inside surface; the upper inside surface of the body member defining a left-hand spiralling thread which spirals from the top of the upper inside surface towards the center of said body member, said left-hand spiralling thread terminating internally of said body member in an arcuate recess extending around the interior of the said body member; the lower inside surface of the body member defining a right-hand spiralling thread which spirals from the bottom of the lower inside surface towards the center of said body member, said right-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; the arcuate recess in the center portion of the cylindrical body separating the terminus of the left-hand spiralling thread from the terminus of the right-hand spiralling thread; a key member secured to the inner wall surface of said recess of said body member, said key member having a lug extending downward and a lug extending upward, said lugs extending longitudinally within said body member within said arcuate recess with the lower lug interrupting the right-hand spiralling thread of the cylindrical body and the upper lug interrupting the left-hand spiralling thread of the cylindrical body at the terminus of each thread; a coil-type slip member comprising an upper slip member with a corresponding left-hand coil rigidly attached to a lower slip member with its corresponding right-hand coil, said upper portion of said slip member configured to make up with said left-hand spiralling thread on said body member and said lower portion of said slip member configured to make up with said right-hand spiralling thread on said body member.

Claim 19

A stabilizer for use in a drill string characterized in that: a substantially cylindrical body member having a central passageway to accommodate the drill string, said member defined by an upper inside surface and a lower inside surface; the upper inside surface of the body member defining a left-hand spiralling thread which spirals from the top of the upper inside surface towards the center of said body member, said left-hand spiralling thread terminating internally of said body member in an arcuate recess extending around the interior of the said body member; the lower inside surface of the body member defining a right-hand spiralling thread which spirals from the bottom of the lower inside surface towards the center of said body member, said right-hand spiralling thread terminating internally of said body member in the arcuate recess extending around the interior of said body member; the arcuate recess in the center portion of the cylindrical body separating the terminus of the left-hand spiralling thread from the terminus of the right-hand spiralling thread; a key member secured to the inner wall surface of said recess of said body member, said key member having a lug extending downward and a lug extending upward, said lugs extending longitudinally within said body member within said arcuate recess with the lower lug interrupting the right-hand spiralling thread of the cylindrical body and the upper lug interrupting the left-hand spiralling thread of the cylindrical body at the terminus of each thread; a coil-type slip member comprising an upper slip member with a corresponding left-hand coil rigidly attached to a lower slip member with its corresponding right-hand coil, said upper portion of said slip member configured to make up with said left-hand spiralling thread on said body member and said lower portion of said slip member configured to make up with said right-hand spiralling thread on said body member.