An oilfield casing centralization tool allows a user to center the casing to install the casing hanger into the bowl profile of a wellhead to support the weight of the casing which can exceed over one million pounds. The oilfield casing centralization tool includes a push jack assembly, an anchoring jack assembly, and an elongated structural member. The anchoring jack assembly allows a user to fully secure the oilfield casing centralization tool to a bolt hole of the wellhead. With the oilfield casing centralization tool fully secured to the wellhead, the push jack assembly allows a user to push the casing a desired distance in order to center the casing within a wellbore. The elongated structural member serves as a rigid hub for the push jack assembly and the anchoring jack assembly.

A system may include an electromagnetic (EM) logging tool for inspecting downhole tubulars. The EM logging tool may include a mandrel, at least one low-frequency transmitter coil disposed on the mandrel, at least one-low frequency receiver coil disposed on the mandrel, and at least one-high frequency sensor configured to measure one or more electromagnetic properties of a tubular.

A drill string for drilling a borehole. The drill string may include a downhole motor operable to rotate the drill string and a centralizer assembly. The centralizer assembly may include an outer housing, a lower sub threadably engaged with the outer housing, and a centralizer. The centralizer may include a single eccentric blade, an internal shoulder positioned between the outer housing and the lower sub, and an alignment profile to align the centralizer in an azimuthal position relative to the drill string. The centralizer may be retainable in the aligned azimuthal position by the alignment profile and the internal shoulder being engaged by the outer housing and the lower sub.

A conductor assembly comprising a conductor of an offshore platform and a guide surrounding the conductor. The guide extending from an upper end to a lower end and having a main portion therebetween, a stabilising body defining a bore extending therethrough, the conductor extending through the bore of the stabilising body, the stabilising body provided between the conductor and the guide optionally the stabilising body comprising an inner body and an outer body. In this way, the conductor is allowed to move vertically within the guide with the only moving surfaces in contact being an outer surface of the inner body and the inner surface of the outer body, thus mitigating or eliminating abrasion of the conductor and/or guide.

A drilling dynamics data recorder is positioned within a slot in a downhole tool. The drilling dynamics data recorder may include a sensor package, the sensor package including one or more drilling dynamics sensors and a processor, the processor in data communication with the one or more drilling dynamics sensors. The drilling dynamics data recorder may also include a memory module, the memory module in data communication with the one or more drilling dynamics sensors and a communication port, the communication port in data communication with the memory module. The drilling dynamics data recorder may further include an electrical energy source, the electrical energy source in electrical communication with the memory module, the one or more drilling dynamics sensors, and the processor.

A method of mitigating whirl on a rotating device includes detecting force on a outer surface of the rotating device and switching the rotating device between a rotating mode and a non-rotating mode. In the rotating mode, the outer surface may rotate with an inner sleeve. In the non-rotating mode, the outer surface may be rotationally isolated from the inner sleeve. The rotating device may include a stabilizer with an active or passive system for switching modes. The stabilizer can include an outer collar, an inner sleeve, and a locking mechanism. The locking mechanism is changeable between a first mode in which the outer collar is rotationally fixed to the inner sleeve and a second mode in which the outer collar is rotationally isolated relative to the inner sleeve. An example passive device may include a magnetic clutch where the detected force overcomes magnetic forces to change mode.

A hydraulic casing centralizer device includes a cylindrical housing having a central chamber extending through a portion of the cylindrical housing and along a central axis thereof. The hydraulic casing centralizer device includes a locking mechanism that reacts to a hydraulic force when the hydraulic force is applied from an inside of the central chamber. The hydraulic casing centralizer device includes a threaded section that is configured for screwing the device into a casing joint. The threaded section may be disposed in the cylindrical housing.

A high efficiency smart steering drilling system includes a smart push force application tool and a centralizer. The centralizer is at an end close to a drill bit. The smart push force application tool is at an end away from the drill bit and includes a push force application wing rib having a telescoping function. The smart push force application tool is capable of automatically measuring an inclination angle and an azimuth angle and comparing the inclination angle and the azimuth angle with design values so as to control the push force application wing rib to output a push force in a telescopic manner based on a difference between the measured values and the design values and applying a push force to the drill bit. The drilling system achieves combined deflection under double action of drill bit push and pointing, greatly improving the deflection capability.

A large diameter injection water well is drilled using a drilling derrick and rotary drilling techniques. After snubbing in and drilling a short distance with drilling mud, a temporary drilling header is installed below the blowout preventers. Extending downward from the temporary drilling header is a drop pipe with a valve on the lower end thereof. Drilling pipe with attachments on the lower end thereof, are lowered into the drop pipe with the valve closed. After sealing to the drilling pipe, the valve is opened and the drilling pipe and attachments are lowered to the bottom of the well for the normal drilling operation. Thereafter, the drilling pipe and attachments are removed reversing the process of retracting into the drop pipe and closing the valve before removing the seal from the drilling pipe. The repeated insertion of the drilling pipe with various attachments on the end thereof in the drilling procedure occurs without having to kill or suppress the well until the final step when removing the drop pipe. Large diameter drillable centering guides insures pilot holes are being drilled in the bottom center of the large diameter injection water well.

A hydraulic propulsion horizontal directional coring device includes a casing pipe, a coring tube assembly and a conversion adapter. Both the casing pipe and the coring tube assembly coaxially set within the casing pipe are tubular. The conversion adapter, having a cylindrical structure fitted with the casing pipe, is coaxially set at a back side of the coring tube assembly and is slidably connected with an inner wall of the casing pipe. Under an action of an external force, the conversion adapter pushes the coring tube assembly to move along an axial direction of the casing pipe till a front end of the coring tube assembly extends out of or retracts into the casing pipe. The conversion adapter and the coring tube assembly have a first channel and a second channel axially provided therein, respectively. The first channel is connected with the second channel.