A mud pulse telemetry valve and method including a flow tube having at least one upper hydraulic opening extending from an inner surface and at least one lower hydraulic opening extending from an inner surface, a flow restriction member positioned in the flow tube and defining an orifice, an orifice housing connected to the flow tube and supporting the flow restriction member, and a screen defining a flow path from a first end of the screen to the orifice. The orifice housing has at least one inlet port in fluid communication with the upper hydraulic opening upstream of the flow restriction member, and the screen has a plurality of filter openings positioned between the flow path and the at least one inlet port. The mud pulse telemetry valve further has a control valve assembly and a pilot valve assembly.

A pressure pulse communication system and method during gas drilling are provided. The system includes a downhole solenoid valve module and a sensor module, where the downhole solenoid valve module includes a valve body, a gas inlet, a piston micro-hole, a moving piston, a piston return spring, a piston cylinder, a gas outlet, a piston pressure relief hole, a solenoid valve spring, a solenoid valve, a battery, a pressure balancer, and a rubber seal. The pressure pulse communication system and method generate pressure pulses by changing the internal pressure of a drill pipe, such that a surface pressure sensor continuously receives the pressure pulses, thereby achieving the purpose of acquiring downhole temperature, pressure, and well inclination angle data.

A system for locating a casing collar includes a drill pipe sub-assembly with a drill pipe segment and detection apparatus. The detection apparatus includes a bypass port disposed in a wall of the drill pipe segment; an annular sleeve which directs fluid through the bypass port and into a drill pipe segment interior portion; an actuator which opens and closes the bypass port; and two magnetized coils which generate an electromagnetic field. The actuator closes the bypass port in response to a predetermined voltage generated by the magnetized coils when they displace past a casing collar. Also included are a weight loss detection device which detects a loss of weight in the drill pipe segment, and a depth determination device which determines a depth of the casing collar, based on detected loss of weight. Also disclosed and described are a related method and drill pipe sub-assembly.

A retrievable whipstock assembly for a wellbore includes a whipstock including a longitudinal body and an anchor connection, a deflection surface provided on the longitudinal body with a first engagement element, and a drilling assembly including a drill housing and a second engagement element. The second engagement element is selectively extendible between a recessed position and an extended position. In the extended position the second engagement element is engageable with the first engagement element.

An actuator sub for generating hydraulic pressure having a sub housing which includes (i) an outer surface, (ii) a main flow passage extending though the sub housing, and (iii) a wall space formed between the main flow passage and the housing outer surface. At least a first hydraulic tube is position in the wall space and an equalization port is configured to transmit pressure in the main flow passage to the first hydraulic tube. A drive motor driving an bi-directional hydraulic motor, are positioned in the first hydraulic tube, with the hydraulic motor being configured to output fluid to a fluid outlet of the first hydraulic tube, and the hydraulic motor, when not under power, allowing the reverse flow of fluid through the hydraulic motor. The actuator sub includes the absence of a check valve along a path carrying fluid between the hydraulic motor and the outlet of the second hydraulic tube.

The present disclosure provides a valve assembly comprising a valve section, a power section, and an electronics section. The valve assembly is configured to mate with a tubing sub (and/or mandrel) inserted in-line with a tubing string inserted into a wellbore. The valve allows for injection into or production from the tubing string. The valve assembly comprises an electric motor and a motor controller permitting fine control over the valve, as well as sensors which measure various parameters, such as fluid flow, valve position, pressure, temperature, and/or water cut. A cable connects the valve assembly to the surface and provides power and data telemetry and allows control of the valve assembly with a remote electronic signal. Multiple valve assemblies may be provided at spaced intervals along the tubing string and individually monitored and/or controlled by a remote location. Also disclosed is a method for operation of such valve assemblies.

An electronic trigger system includes a longitudinal housing including detection, electronics, and actuation sections disposed therein. The detection section includes a pressure sensor for receiving a predetermined pressure signal, and an electronic control board including at least one battery is disposed in the electronics section. The actuation section includes a prefill chamber, a setting piston disposed in the prefill chamber, an actuation device, an atmospheric chamber, and a pressure port. A predetermined amount of prefilled fluid at hydrostatic pressure is trapped between the setting piston and the actuation device in the prefill chamber. The actuation device isolates the prefilled fluid at hydrostatic pressure in the prefill chamber from the atmospheric chamber. Actuation occurs when, upon receipt of the predetermined pressure signal by the pressure sensor, the electronic control board transmits power to the actuation device, causing the prefilled fluid to flow through the actuation device and into the atmospheric chamber.

A fluid control system includes a fluid control device configured to be connected to at least one of two casing elements in a well, for controlling a fluid flow between a bore of the fluid control device and a zone located outside the casing elements; and a tracer material located within an inner chamber of a body of the fluid control device, the tracer material being uniquely associated with the fluid control device. The fluid control device is configured to release, when activated, the tracer material out of the inner chamber.

An apparatus includes a sub-surface safety valve (SSSV) to be positioned in a wellbore. The SSSV is configurable to move between a closed position and an open position. While in the closed position, the SSSV prevents downhole fluid in the wellbore to flow to a surface of the wellbore. While in the open position, the SSSV allows the downhole fluid in the wellbore to flow to the surface of the wellbore. The apparatus further includes an electrostatic motor to be positioned in the wellbore and to be coupled to the SSSV. The electrostatic motor is to be selectively powered to move the SSSV between the closed position and the open position.

A method of operating an actuator in mud having debris and lost circulation material is described. The method includes closing a servo valve positioned within a valve housing. The valve housing has a plurality of fluid vents positioned downstream of the servo valve and a plurality of debris vents positioned upstream of the servo valve. Dimensions of the plurality of fluid vents are less than dimensions of the plurality of debris vents. Closing of the servo valve creates a first fluid path such that fluid flows from a mud pump at a surface into the plurality of debris vents and out of the plurality of fluid vents shielding the servo valve from debris and lost circulation material.