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A telescoping four-sided drilling derrick and method of erection that is to be positioned on a drill floor over a well bore and is capable of withstanding severely adverse weather, environmental or geologic conditions. The derrick is in several sections and includes a bottom section, a top section a

A telescoping four-sided drilling derrick and method of erection that is to be positioned on a drill floor over a well bore and is capable of withstanding severely adverse weather, environmental or geologic conditions. The derrick is in several sections and includes a bottom section, a top section and at least one intermediate section all for superpositioning over the bottom section to form a vertical four-sided tower. Each of the sections is composed of vertical members positioned in each of the four corners of each section to thereby form a total of four faces around the perimeter of each section. A window is one face sufficiently large to receive consecutively therebelow at least one section. In turn each of the intermediate sections is inserted within the bottom section for subsequent serial telescopic raising of the intermediate sections. Thereafter support means is connected across the window after the last intermediate section has been received within the bottom section so as to substantially close the window and rigidify the bottom section to enable the bottom section and the derrick to withstand the stress imposed by the superposed sections and any severely adverse conditions.

대표청구항 ▼

A telescoping four sided drilling derrick for positioning on a drill floor over a well bore and being capable of withstanding severely adverse weather, environmental or geologic conditions comprising: a bottom section, a top section and at least one intermediate section for super positioning over sa

A telescoping four sided drilling derrick for positioning on a drill floor over a well bore and being capable of withstanding severely adverse weather, environmental or geologic conditions comprising: a bottom section, a top section and at least one intermediate section for super positioning over said bottom section to form a vertical four sided drilling derrick, each of said sections being composed of vertical members positioned in each of the four corners of said section, four faces being formed around the perimeter of each said section between adjacent said vertical members, said vertical members of said intermediate section having an abutment secured to a vertical side of said vertical member, a latch means positioned on the upper end of said bottom section and having an abutment surface thereon for operating contact with the abutment of said vertical member, each of said faces in each section including at least one bracing cross member supporting adjacent said vertical members, said at least one bracing cross member in said bottom section being secured along an upper portion of the base of said bottom section forming a window, said window being sufficiently large to receive consecutively below said at least one bracing cross member each of said intermediate sections within said bottom section for subsequent serial telescopic raising of said intermediate sections, support means connected across said window to substantially close said window and rigidify said bottom section to enable said bottom section and said derrick to withstand the stress imposed by the superposed sections and any said adverse conditions.