Smith International, Inc.

Schlumberger Technology Corporation

Sandvik Intellectual Property Ab

Sameer Bhoite

Manoj D Mahajan

Navish Makkar

Charles H Dewey

Dwayne P Terracina

Tommy Gene Ray

Jaroslav Dobos

Dean M Homan

Vincent Shotton

Brian Cruickshank

Erwann Lemenager

Daniel W Brietzke

Edward M Tollefsen

Mahavir Nagaraj

Jeremy Marcus

Huicheng Pan

Asif Khaleel

Michael Bladon

Jung Kee Chung

An electromagnetic (EM) telemetry system includes an EM transmitter configured to transmit EM signals downhole and multiple sensors each configured to communicate with the EM transmitter and with another of the multiple sensors. Each sensor is placed a distance from another sensor along a length of a wellbore in the EM telemetry system. The EM telemetry system also includes a processor configured to select two or more sensors of the multiple sensors based on a signal to noise ratio (SNR) of an EM signal received from the two or more selected sensors, a depth of the EM transmitter, or both.

Downhole electromagnetic sensing techniques

A method for conducting survey measurements in a ranging operation between a first well and a second well include generating an electromagnetic field in a downhole location in the first well and scanning for the electromagnetic field in a downhole location in the second well. When at least one characteristic of the electromagnetic field is detected, the method includes automatically initiating survey measurements for a ranging operation without receiving a downlink command from surface.

Downhole electromagnetic communications between two wells

A downhole tool for increasing a cross-sectional area of a wellbore is provided. The downhole tool may include a first drilling assembly including a first reaming tool for selectively increasing the cross-sectional area of the wellbore. A first ball seat may receive a first ball. At least one of the first ball seat and the first ball may deform to allow the first ball to pass through the first ball seat when a predetermined pressure is applied thereto. A first piston may be coupled to the first ball seat. The first ball seat and the first piston may stroke when the first ball is received within the first ball seat, thereby actuating the first reaming tool between an active state and an inactive state.

Selective deployment of underreamers and stabilizers

An underreamer for increasing a diameter of a wellbore. The underreamer includes a body having an axial bore extending at least partially therethrough. An annular sleeve may be coupled to the body and adapted to move with respect to the body. The sleeve may include a plurality of grooves formed therein that are circumferentially offset from one another. A pin may be coupled to the body. The sleeve may be adapted to move with respect to the pin to transition the pin from a first groove in the sleeve to a second groove in the sleeve. The sleeve may be in a first axial position with respect to the body when the pin is positioned in the first groove, and the sleeve may be in a second axial position with respect to the body when the pin is positioned in the second groove. The underreamer also includes one or more cutter blocks. The radial cutting diameter of the one or more cutter blocks depends on the axial position of the one or more cutter blocks and may be determined therefrom.

Adjustable diameter underreamer and methods of use

The expandable tools disclosed herein may be used as an underreamer to enlarge a borehole, or may be used to stabilize a drilling system in a previously underreamed borehole or in a borehole that is being underreamed while drilling progresses. At least one moveable arm, which translates between a collapsed and expanded position in response to a differential pressure between the axial flowbore and the wellbore, includes a borehole-engaging surface with cutting elements and at least one nozzle to direct a fluid across the borehole-engaging surface. Flow directing elements on the external surface of the tool may be used to decrease the flow area in an annulus between the tool and the wellbore and directs fluid flow in the annulus toward the borehole-engaging surface.

Jet arrangement on an expandable downhole tool

A cutting structure for use with a reamer in enlarging a borehole in a subterranean formation includes a plurality of cutter blocks, radially extendable from a reamer body away from a central axis of the reamer body, each of the plurality of cutter blocks comprising at least one cutter blade thereon, wherein an angular spacing about the central axis of the reamer body between the at least one cutter blade on each of the plurality of cutter blocks is unequal.

Downhole reamer asymmetric cutting structures

A thrust bearing system for a roller cone rock bit includes at least one roller cone disposed on a leg having an air channel therethrough, the thrust bearing system including a primary thrust bearing surface on the leg configured to contact a corresponding primary bearing surface on the roller cone, wherein the primary thrust bearing surface on the leg includes at least one air circulation port in fluid communication with the air channel. The thrust bearing system further includes a secondary thrust bearing surface on the leg configured to contact a corresponding secondary bearing surface on the roller cone, wherein the secondary thrust bearing surface on the leg includes at least two air circulation ports located at specified locations in the secondary bearing surface and in communication with the air channel, and wherein a first circulation port is located in an upper half of the secondary thrust bearing surface and a second circulation port is located in a lower half of the secondary thrust bearing surface.

Air circulation ports in rotary rock bit journal bearing

Growing community of inventors

Conroe, TX, United States of America

Sameer Bhoite