Spiralling tapered slip-on drill string stabilizer

Claim 2

A stabilizer for use in a drilling string comprising: 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 and to wedge between said body member and said drill string, 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 in which said lug is integral with said body member.

Claim 4

The stabilizer of claim 1 in which said arcuate recess extends around the periphery of the interior surface 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 5

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

Claim 6

The stabilizer of claim 4 in which the basket-like slip member has a longitudinal slot extending from the bottom of slip member to the top of slip member.

Claim 7

The stabilizer of claim 5 in which the basket-like slip member has partial longitudinal slots disposed about the circumference of the slip member.

Claim 8

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

Claim 9

The stabilizer of claim 1 wherein the slip member has serrations or teeth like members on the interior surface of the slip, said serrations or teeth-like members adjacent the drill string.

Claim 10

The stabilizer of claim 1 further comprising at least one blade longitudinally disposed on the exterior surface of said body member.

Claim 11

The stabilizer of claim 1 wherein the slip member and body have a single start thread.

Claim 12

The stabilizer of claim 1 wherein the slip member and body threads have more than one start.

Claim 13

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

Claim 14

The stabilizer of claim 1 further comprising stabilizer blades with a trailing edge slope greater than the leading edge slope.

Claim 15

A stabilizer for use in a drilling string comprising: 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 an 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; 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 thread 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 16

A stabilizer for use in a drilling string comprising: 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 an 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; 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 thread 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 17

The stabilizer of claim 14 in which said lugs are intergal with said body member.

Claim 18

The stabilizer of claim 14 in which said arcuate recess extends around the circumference of 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 19

The stabilizer of claim 14 in which said slip members are integral basket-like members.

Claim 20

The stabilizer of claim 17 in which each basket-like slip member has a longitudinal slot extending from the bottom of slip member to the top of slip member.

Claim 21

The stabilizer of claim 18 in which each basket-like member has partial longitudinal slots disposed about the circumference of the slip member.

Claim 22

The stabilizer of claim 14 in which each said slip member is a coil-type member.

Claim 23

The stabilizer of claim 14 wherein each slip member has serrations or teeth like members on the interior surface of the slip, said serrations or teeth like members adjacent the drill string.

Claim 24

The stabilizer of claim 14 further comprising at least one blade longitudinally disposed on exterior of said body.

Claim 25

The stabilizer of claim 14 wherein the slip member and body have a single start thread.

Claim 26

The stabilizer of claim 14 wherein the slip member and body threads have more than one start.

Claim 27

The stabilizer of claim 14 wherein 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 28

The stabilizer of claim 14 wherein 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 29

The stabilizer of claim 14 further comprising stabilizer blades with a trailing edge slope greater than the leading edge slope.

Claim 30

A stabilizer for use in a drill string comprising: 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 31

A stabilizer for use in a drill string comprising: 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.