Abstract: A directly connected drill pipe applicable to extreme conditions includes a tool joint pin and a tool joint box, where an external pipe section is located on an external side of a threaded section of the tool joint pin, and an annular groove is formed between the external pipe section and the threaded section of the tool joint pin. An insertion section of the tool joint box can be inserted into the annular groove in a matched manner. A main shoulder of the tool joint pin is located at an end of the external pipe section, a main auxiliary shoulder of the tool joint pin is located on a bottom surface of the annular groove, and an auxiliary shoulder of the tool joint pin is located at a small end of the tool joint pin. The tool joint box has three corresponding shoulders which form a 3-stage sealing with the tool joint pin.

Abstract: A forced separation device includes a transmission shaft, a main shaft, an electromagnetic transmission mechanism, a blasting separation mechanism and a pressure-resistant cabin. A pressing cover is fastened to the upper portion of the pressure-resistant cabin. The electromagnetic transmission mechanism is provided with a driving chuck and a driven chuck. The driving chuck is connected with the transmission shaft, the driven chuck is connected with the main shaft, the pressing cover is welded with the transmission shaft, and the driven chuck is welded with the lower portion of the pressure-resistant cabin. The blasting separation mechanism is provided with explosive packages and detonators. A plurality of explosive packages are distributed between the pressing cover and the top surface of the pressure-resistant cabin, and each explosive package is connected with the corresponding detonator respectively. The pressure-resistant cabin is further internally provided with a storage battery.

Abstract: A wire-line core drilling tool includes an outer barrel assembly and an inner barrel assembly. The inner barrel assembly is provided with an elastic clamp positioning mechanism, an in-place reporting and core blockage alarm mechanism, a single-action mechanism, a core barrel check valve mechanism, a core barrel and a core-breaking mechanism. The elastic clamp positioning mechanism adopts a multi-point hinged mode. The in-place reporting and core blockage alarm mechanism is integrally formed. The single-action mechanism adopts a cooperating structure of an upper polycrystalline diamond compact (PDC) bearing, a lower PDC bearing and a tungsten carbide (TC) bearing arranged in the middle. The outer barrel assembly is provided with an elastic clamp retaining head, an elastic clamp chamber, an upper reamer, an outer barrel, a lower reamer and a drill bit. A ring base is arranged, and a centralizing ring is arranged.

Abstract: A directly connected drill pipe applicable to extreme conditions includes a tool joint pin and a tool joint box, where an external pipe section is located on an external side of a threaded section of the tool joint pin, and an annular groove is formed between the external pipe section and the threaded section of the tool joint pin. An insertion section of the tool joint box can be inserted into the annular groove in a matched manner. A main shoulder of the tool joint pin is located at an end of the external pipe section, a main auxiliary shoulder of the tool joint pin is located on a bottom surface of the annular groove, and an auxiliary shoulder of the tool joint pin is located at a small end of the tool joint pin. The tool joint box has three corresponding shoulders which form a 3-stage sealing with the tool joint pin.

Abstract: A wire-line core drilling tool includes an outer barrel assembly and an inner barrel assembly. The inner barrel assembly is provided with an elastic clamp positioning mechanism, an in-place reporting and core blockage alarm mechanism, a single-action mechanism, a core barrel check valve mechanism, a core barrel and a core-breaking mechanism. The elastic clamp positioning mechanism adopts a multi-point hinged mode. The in-place reporting and core blockage alarm mechanism is integrally formed. The single-action mechanism adopts a cooperating structure of an upper polycrystalline diamond compact (PDC) bearing, a lower PDC bearing and a tungsten carbide (TC) bearing arranged in the middle. The outer barrel assembly is provided with an elastic clamp retaining head, an elastic clamp chamber, an upper reamer, an outer barrel, a lower reamer and a drill bit. A ring base is arranged, and a centralizing ring is arranged.

Abstract: A forced separation device for a submarine drilling machine and a drilling tool comprises a transmission shaft, a main shaft, an electromagnetic transmission mechanism, a blasting separation mechanism and a pressure-resistant cabin, a gland is fastened to the upper portion of the pressure-resistant cabin, the electromagnetic transmission mechanism is provided with a driving sucker and a driven sucker, the driving sucker is connected with the transmission shaft, the driven sucker is connected with the main shaft, the gland is welded with the transmission shaft, and the driven sucker is welded with the lower portion of the pressure-resistant cabin; the blasting separation mechanism is provided with explosive packages and detonators, a plurality of explosive packages are distributed between the gland and the top surface of the pressure-resistant cabin, and each explosive package is connected with the corresponding detonator respectively; and the pressure-resistant cabin is further internally provided with a stor

Abstract: A multifunctional directional wireline core drilling device includes an outer assembly, an inner assembly, a core unjamming mechanism, and a directional coring mechanism. According to the present disclosure, wireline core drilling can be fulfilled; in addition, the directional coring mechanism can truly restore the strike and azimuth of a stratum facture by obtaining a core with an azimuth. By controlling the flow of drilling fluid during drilling, the core unjamming mechanism can effectively reduce core abrasion, generated due to jamming in the core barrel, during drilling, so that the core recovery of a fractured stratum prone to causing core jamming and the drilling efficiency are greatly improved.

Abstract: A directly connected drill pipe applicable to extreme conditions includes a tool joint pin and a tool joint box, where an external pipe section is located on an external side of a threaded section of the tool joint pin, and an annular groove is formed between the external pipe section and the threaded section of the tool joint pin. An insertion section of the tool joint box can be inserted into the annular groove in a matched manner. A main shoulder of the tool joint pin is located at an end of the external pipe section, a main auxiliary shoulder of the tool joint pin is located on a bottom surface of the annular groove, and an auxiliary shoulder of the tool joint pin is located at a small end of the tool joint pin. The tool joint box has three corresponding shoulders which form a 3-stage sealing with the tool joint pin.