Bei einem Hartmetallkopf für ein Werkzeug zum Bearbeiten von Feststoffmaterial, wie Gestein, Beton, der zum Befestigen an einem Ende eines Schafts des Werkzeugs ausgelegt ist und eine dem zu bearbeitenden Feststoffmaterial zuzuwendende Stirnfläche sowie eine im wesentlichen längs des Schaftes, vorstehende Seitenfläche aufweist, ist vorgesehen, dass in der Stirnfläche und/oder in der Seitenfläche eine als eine Vertiefung und/oder Erhebung ausgebildete Verschleißmarkierung eingearbeitet ist.

The present invention is directed to an improved method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations. The invention may be alternatively characterized as either (1) an improved downhole drill bit, or (2) a method of monitoring at least one operating condition of a downhole drill bit during drilling operations in a wellbore, or (3) a method of manufacturing an improved downhole drill bit. When characterized as an improved downhole drill bit, the present invention includes (1) an assembly including at least one bit body, (2) a coupling member formed at an upper portion of the assembly, (3) at least one operating conditioning sensor carried by the improved downhole drill bit for monitoring at least one operating condition during drilling operations, and (4) at least one memory means, located in and carried by the drill bit body, for recording in memory data pertaining to the at least one operating condition. Optionally, the improved downhole drill bit of the present invention may cooperate with a communication system for communicating information away from the improved downhole drill bit during drilling operations, preferably ultimately to a surface location. The improved downhole drill bit of the present invention may further include a processor member, which is located in and carried by the drill bit body, for performing at least one predefined analysis of the data pertaining to the at least one operating condition, which has been recorded by the at least one memory means.

The present invention is directed to an improved method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations. The invention may be alternatively characterized as either (1) an improved downhole drill bit, or (2) a method of monitoring at least one operating condition of a downhole drill bit during drilling operations in a wellbore, or (3) a method of manufacturing an improved downhole drill bit. When characterized as an improved downhole drill bit, the present invention includes (1) an assembly including at least one bit body, (2) a coupling member formed at an upper portion of the assembly, (3) at least one operating conditioning sensor carried by the improved downhole drill bit for monitoring at least one operating condition during drilling operations, and (4) at least one memory means, located in and carried by the drill bit body, for recording in memory data pertaining to the at least one operating condition. Optionally, the improved downhole drill bit of the present invention may cooperate with a communication system for communicating information away from the improved downhole drill bit during drilling operations, preferably ultimately to a surface location. The improved downhole drill bit of the present invention may further include a processor member, which is located in and carried by the drill bit body, for performing at least one predefined analysis of the data pertaining to the at least one operating condition, which has been recorded by the at least one memory means.

Die Erfindung betrifft ein Bohrwerkzeug mit einem als Platte (4) oder Kopf ausgebildeten Schneidelement (3) mit wenigstes einer radial nach außen gerichteten Querseite (6), welche zur Führung des Bohrwerkzeugs in einem Bohrloch dient. An der Querseite (6) ist ein Führungsbereich (15) und ein Vergleichsbereich (16) ausgebildet, wobei der Vergleichsbereich (16) gegenüber dem Führungsbereich (15) radial zu einer Längsachse des Bohrwerkzeugs um einen Verschleißabstand (a) zurückversetzt ist.

A rolling cutter drill bit comprises a bit body (12) adapted for rotation about a longitudinal axis (8), a plurality of extending legs (14), and a cantilevered bearing spindle (16) formed on each leg (14), a plurality of rolling cone cutters (17, 18, 19) being rotatably mounted upon the bearing spindles (16) with the cone apices (15) adjacent to the longitudinal axis (8) of the bit, a plurality of cutting inserts (20) being secured in the rolling cone cutters (17, 18, 19), and being arranged in a plurality of rows (50, 52, 54), at least two of the rolling cone cutters (17, 18, 19) being intermeshing cutters, arranged such that they have intermeshing rows of cutting inserts (20), wherein at least one of the intermeshing cutters (17, 18, 19) has a groove (72, 74, 76, 78) arranged to register with one of the rows (54) of cutting inserts (20) of another of the intermeshing cutters (17, 18, 19), and wherein the groove (72, 74, 76, 78) contains a plurality of generally flat top bearing inserts (88).

To test coiled tubing, at least one test is performed on a coiled tubing that has been used, such as in an oil or gas well. Performing such test includes obtaining a specific output data event (e.g. a nondestructive evaluation test readout) for the used coiled tubing. The specific output data event is compared with a predetermined sequence of output data events (e.g. a collection of data defining a "lifeline" for the coiled tubing) for determining where the sequence and the specific output data event correspond. A coiled tubing status indication is generated in response to where the specific output data event corresponds with the sequence as a measure of a point in the useful life of the used coiled tubing.

To test coiled tubing, at least one test is performed on a coiled tubing that has been used, such as in an oil or gas well. Performing such test includes obtaining a specific output data event (e.g. a nondestructive evaluation test readout) for the used coiled tubing. The specific output data event is compared with a predetermined sequence of output data events (e.g. a collection of data defining a "lifeline" for the coiled tubing) for determining where the sequence and the specific output data event correspond. A coiled tubing status indication is generated in response to where the specific output data event corresponds with the sequence as a measure of a point in the useful life of the used coiled tubing.

The invention is related to a method of determining the instantaneous rotation speed of a drill string or a drill bit in a borehole or the lateral shocks applied to the string or bit. The centripetal acceleration of the drill string is measured at at least two opposite ends of a drill string diameter so as to obtain two centripetal acceleration signals ac1 and ac2; the signals ac1 and ac2 are combined and the instantaneous rotation speed or the lateral shocks are derived from said combined signal. The accelerometers must be of the type delivering a signal with a DC component.

An important application of the invention is to transform drill string rotation speed dependent data acquired versus time with a constant sampling time increment T_c separating successive data, into compensated data which would be obtained for a substantially constant drill string rotation speed S_c. The compensated data are obtained either by adjusting the constant sampling time interval T_c into a variable sampling time increment T_v, using the measured instantaneous rotation speed S, or by selecting the data which have been acquired during periods of time during which the instantaneous rotation speed of the drill string varied within predetermined limits only.