Method and device for effecting, by means of specialized tools, such operations as measurements in highly inclined to the vertical or horizontal well portions

Claim 1

A method for effecting logging or servicing operations in a predetermined zone of a bore hole having, from the ground surface downwardly, an initial portion substantially vertical or of slight inclination, followed by an inclined or horizontal portion, with said predetermined zone being located beyond said initial portion of the well, the method comprises the steps of, (a) fixedly securing at the ground surface a logging or servicing tool body to the lower end of a first rod of a string of rods, with said tool body being electrically connected to a first electric connector rigidly secured to said first rod and accessible from the upper portion thereof, (b) assembling the string of rods, by end-to-end connection of new drill rods above the first rod, and progressively lowering the assembly of the tool body and the string of rods into the well as it is assembled, and in the absence of an external conduit extending within said bore hole from the ground surface to said predetermined measuring zone, for supporting, at its lower end, said string of rods after assembled, (c) introducing a second plug-in electric connector for use in a liquid medium, in the string of rods, from the surface, with said second connector being mechanically secured to the lower end of an electric transmission cable and electrically connected to the surface through said cable, and with said method further comprising: (1) lowering said second connector, secured to said cable and weighted, into the string of rods when the tool body is positioned substantially at the predetermined zone of the well, by sliding the cable through a sealing member secured at the surface to the string of rods, and with said sealing member comprising a special sub with a lateral port through which the cable is passed, and which is secured to the upper end of the string of rods; (2) displacing said second connector through the inclined or horizontal portion of the string of rods by pumping a fluid through the string of rods from the surface in a manner so as to exert a moving force on said second connector until said second connector operatively connects to said first connector; (3) displacing the tool through the well by adding a tubular string of rod elements above the special sub to thereby position the tool body in the predetermined zone of the well; and (4) effecting the logging or servicing operation in said zone.

Claim 2

A method for effecting logging or servicing operations in a predetermined zone of a bore hole having, from the ground surface downwardly, an initial portion substantially vertical or of slight inclination, followed by an inclined or horizontal portion, with said predetermined zone being located beyond said initial portion of the well, the method comprises the steps of, (a) fixedly securing at the ground surface a logging or servicing tool body to the lower end of a first rod of a string of rods, with said tool body being electrically connected to a first electric connector rigidly secured to said first rod and accessible from the upper portion thereof, (b) assembling the string of rods, by end-to-end connection of new drill rods above the first rod, and progressively lowering the assembly of the tool body and the string of rods into the well as it is assembled, and in the absence of an external conduit extending within said bore hole from the ground surface to said predetermined measuring zone, for supporting, at its lower end, said string of rods after assembled, (c) introducing a second plug-in electric connector for use in a liquid medium, in the string of rods, from the surface, with said second connector being mechanically secured to the lower end of an electric transmission cable and electrically connected to the surface through said cable, and with said method further comprising: (1) lowering said second connector, secured to said cable and weighted, into the string of rods when the tool body is positioned substantially at the predetermined zone of the well, by sliding the cable through a sealing member secured at the surface to the string of rods, and with said sealing member comprising a special sub with a lateral port through which the cable is passed, and which is secured to the upper end of the string of rods; (2) displacing said second connector through the inclined or horizontal portion of the string of rods by pumping a fluid through the string of rods from the surface in a manner so as to exert a moving force on said second connector until said second connector operatively connects to said first connector; (3) displacing the tool through the well by adding a tubular string of rod elements above the special sub to thereby position the tool body in the predetermined zone of the well; and (4) effecting the logging or servicing operation in said zone.

Claim 9

A device for effecting logging or servicing operations with the use of a specialized tool, in a predetermined zone of a bore hole, comprising in combination a first hollow rigid rod at the end of which is fixedly secured the tool, and constructed such that no external conduit extending within the bore hole from the ground surface to said predetermined measuring zone is required for supporting, at its lower end, said string of rods when said device is in use after being assembled, a first electric connector connected to the tool, a string of rods connectable to the upper portion of said first rigid rod, and an electric cable provided at its end with a second electric connector complementary to the first connector for connection thereto, and said string of rods comprising: at its upper portion, a sealing member adapted for having the cable slide therethrough into the string of rods, and said second connector is weighted and provided with means for causing it to move downwardly through the string of rods by the effect of a fluid pressure generated inside the string of rods on the second connector, and wherein said sealing member comprises a special sub having a lateral port through which the cable can pass, with said special sub adapted for being mounted on the top of the string of rods, and for being displaced into the bore hole by a distance A through which said tool is to be moved in said predetermined zone.

Claim 10

A device for effecting logging or servicing operations with the use of a specialized tool, in a predetermined zone of a bore hole, comprising in combination a first hollow rigid rod at the end of which is fixedly secured the tool, and constructed such that no external conduit extending within the bore hole from the ground surface to said predetermined measuring zone is required for supporting, at its lower end, said string of rods when said device is in use after being assembled, a first electric connector connected to the tool, a string of rods connectable to the upper portion of said first rigid rod, and an electric cable provided at its end with a second electric connector complementary to the first connector for connection thereto, and said string of rods comprising: at its upper portion, a sealing member adapted for having the cable slide therethrough into the string of rods, and said second connector is weighted and provided with means for causing it to move downwardly through the string of rods by the effect of a fluid pressure generated inside the string of rods on the second connector, and wherein said sealing member comprises a special sub having a lateral port through which the cable can pass, with said special sub adapted for being mounted on the top of the string of rods, and for being displaced into the bore hole by a distance A through which said tool is to be moved in said predetermined zone.