CNPC USA Corp. Patent applications |
Patent application number | Title | Published |
20160097702 | METHOD OF TESTING A POLYCRYSTALLINE DIAMOND COMPACT CUTTER - The method for determining fracture toughness includes clamping a cutting element in a first orientation, exerting a confining pressure on the cutting element, applying a first load at a first distance from a perimeter of the diamond table of the cutting element, increasing the first load to a first level sufficient to fracture, and recording the first level sufficient to fracture. Then, another load is applied at another distance from a perimeter of the diamond table with another cutting element or the same cutting element in another orientation. The load is increased until fracture again. The steps are repeated at different distances and different orientations to create a profile of the fracture toughness of the cutting element. The method also includes wearing the cutting element and measuring fracture toughness at a worn distance. The profile is a more complete rating of the cutting element under drilling conditions. | 04-07-2016 |
20160097242 | POLYCRYSTALLINE DIAMOND COMPACT CUTTER - The polycrystalline diamond compact cutter includes a diamond table and a carbide substrate. Different zones of the diamond table with relative thermal stability and toughness to each other are arranged for a particular cutting efficiency and working life. A thermally stable zone has a metal formation agent removed and forms a top outer ring. A base zone bonds to the carbide substrate on the bottom surface of the diamond table. An anchor zone sets between the thermally stable zone and the base zone, and an absorbing zone extends from the top surface to the base zone. The absorbing zone is circumscribed by the thermally stable zone and the anchor zone. The weight percentage metal content of the anchor zone is less than weight percentage metal content of the base zone. The weight percentage metal content of the base zone is less than weight percentage metal content of the absorbing zone. | 04-07-2016 |
20150308206 | SYSTEM AND METHOD FOR SETTING A COMPLETION TOOL - The system and method for setting a completion tool within a wellbore includes assembling a mandrel, inner sleeve, piston, outer sleeve, and dog member. In a first locked position, the dog member abuts against the indentation of the mandrel and the locking surface of the piston. The dog member is friction fit between the piston and mandrel so that movement of the completion tool corresponds to movement of the mandrel. The mechanical link, such as shear pins, of the completion tool is protected by the dog member holding steady on the mandrel. When the completion tool reaches the desired location, a pressure pulse opens a chamber between the sleeves to transition to a second released position. The dog member releases from the mandrel to be housed in the chamber, when movement of the mandrel sets the completion tool by the mechanical link, such as shear pins. | 10-29-2015 |
20150212226 | SYSTEM AND METHOD FOR A DOWNHOLE LOGGING TOOL WITH AN ARRAY OF PAIRED RECEIVER ANTENNAS - The system for measuring electric resistivity around a borehole includes a tool body having a generally cylindrical shape, at least one transmitter at a first transmitter position on the tool body, an array of receivers on the tool body at a set distance from the first transmitter position, and a processor connected to the transmitter and the array. Each transmitter produces a set of five different measurement combinations with various resolution, coarseness, depth of investigation, and verification with the array. The array includes two pairs of receivers, and each receiver is an antenna, such as a coil in a groove with an antenna shield. The array has innovative placement of each receiver of the two pairs of receivers on the tool body relative to the transmitter for a more complete evaluation of a formation around a borehole. | 07-30-2015 |
20150136403 | BALL SEAT SYSTEM - The system and method for hydraulic fracturing includes a downhole tool with a sub, a sleeve, a ball seat support, and a ball seat holder. A ball dropped through the wellbore sits on the ball interface of the ball seat holder. Fluid flowing through the system pushes the ball against the ball interface, causing the ball seat holder to slide through the ball seat support and the ball interface to clamp the ball. A ball matches only a particular ball interface. Additional pressure forms a seal of the ball, the ball seat holder, and the ball seat support and moves the sleeve to slide through the sub and expose the throughbore to the annulus for the fracturing. Contact distributed between the ball, ball interface of the ball seat holder, and ball seat support withstands the temperature and pressure of the fracturing without deformation or failure of the ball. | 05-21-2015 |
20140174738 | MILLABLE BRIDGE PLUG SYSTEM - A millable bridge plug system includes a mandrel, a sealing member, ring members, cone assemblies, and slip devices. The sealing member, ring members, cone assemblies and slip devices are positioned on and around the mandrel. Ring members push against an upper end and lower end of the sealing member. The sealing member has a surface interface contacting each of the ring members so that pressure from the ring members is exerted according to contact along the surface interface. The surface interface can have a curvature or be a double radiused surface. The ring members are pushed against the cone assemblies, and the ring members have ring surface interfaces contacting the cone assemblies. The pressure from the cone assemblies is exerted according to contact along the ring surface interface of the ring members. Coordination of the surface interfaces and ring surface interfaces control pressure to insure improved sealing against the wellbore. | 06-26-2014 |
20140166317 | MILLABLE BRIDGE PLUG SYSTEM - A millable bridge plug system includes a mandrel having an upper portion and a lower portion, a shearing member attached at said upper portion of the mandrel, a sealing member, ring members, cone assemblies, slip devices, and a cap member at a lower portion of the mandrel. The shear member and the cap member are modular so that one bridge plug interchangeably connects to another bridge plug. The shear members are compatible with cap members of other bridge plugs. The shear member and the cap member further include a locking mechanism for rotational engagement by protrusions on the cap member being fit into the shear member and a locking mechanism for triggering a spring loaded lock into a groove on the cap member. | 06-19-2014 |
20140166283 | MILLABLE BRIDGE PLUG SYSTEM - A millable bridge plug system includes a mandrel, a sealing member, ring members, cone assemblies, and slip devices. The sealing member, ring members, cone assemblies and slip devices are positioned on and around the mandrel. Ring members abut against an upper end and a lower end of the sealing member. The other sides of the ring members abut against the cone assemblies, and the cone assemblies engage respective slip devices. The cone assemblies have surface interfaces contacting each of the slip devices so that pressure from the cone assemblies is exerted according to contact along the surface interfaces. Each surface interface can have a curvature or be a single radiused surface. Coordination of the surface interfaces control pressure to insure improved fixed positioning in the wellbore. | 06-19-2014 |
20140158361 | PRESSURE CONTROLLED MULTI-SHIFT FRAC SLEEVE SYSTEM - A frac sleeve system includes an outer sleeve with openings, an inner sleeve with ports, a pressure seat, a bottom locking device and a spring device. In a closed configuration of the inner sleeve, the openings and ports are not aligned for any fluid connection. In an opened configuration, at least one opening is aligned with at least one port for a fluid connection through the system. The inner sleeve shifts back and forth between configurations according to the pressure seat and the spring. The interaction of a guide pin on the outer sleeve and the guide slot on the inner sleeve controls the rotational and longitudinal movement of the inner sleeve along the common axis of the inner sleeve and outer sleeve so that there is unlimited shifting between configurations. The locking devices and spring device are also reuseable for the multiple shifting. | 06-12-2014 |