SU1370235A1 - Device for locating seizure of drill pipe string - Google Patents

Abstract

The invention relates to the oil and gas industry. The purpose of the invention is to increase reliability in operation by simplifying the design and technology of work. The device contains a cable lug 6, a cargo carrier 7 and a non-magnetic case 4 in which an induction coil with core 2 and a pole tip (pi) 3 is placed. The device has an additional non-magnetic case 4 in which an additional induction coil with core 2 is placed, Mon 3 and nonmag

Description

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nntnymi levers 5. Same NP J directed in the same direction. Each body 4 is pivotally connected by levers 5, one end with a tip 6, and the other with a load carrier. Spread evenly around the perimeter of the drill pipe with magnetic marks, PN 3 coils with cores 2. The amplitudes of the magnetic marks are recorded. Then the maximum permissible deformation load is applied to the pipes and the recording of the amplitudes of the magnetic marks is repeated. By comparing the recorded amplitude record, a sticking zone is determined. 2 Il.

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The invention relates to the oil and gas industry and can be used to determine the location of sticking of drill pipes in case of accident elimination in a well.

The purpose of the invention is to increase the reliability of work at the expense of simplifying the design and technology of work.

FIG. 1 shows the device in the transport position and during the registration of the amplitudes of the magnetic labels; a general view; in fig. 2 - the same, at the moment of setting the magnetic mark.

A device for determining the location of sticking of a string of pipe 1 contains induction coils with core 2, pole pieces 3 housed in a nonmagnetic body 4, non-magnetic levers 5, cable tip 6 and a load carrier 7. The device may contain one or more additional non-magnetic bodies 4.

Identical induction coils with core 2 are rigidly fastened with pole tips 3 and placed in non-magnetic housings 4. Each non-magnetic housing 4 is pivotally connected by non-magnetic levers 5 at one end with cable lug 6, and with the opposite end to the load carrier 7. Equal pole tips 3 are directed in the same direction. I

The device works as follows.

The device is lowered into the assumed interval of the clamp. And the pipe strings, stop the movement of the device and feed a constant current through the cable lug 8 through the cable lug 6 and induction coils with core 2. At this

between the pole tips 3, mutual repulsion forces arise, since the pole tips of the same name are directed in one direction. As the body of the drill pipe 1 approaches, the attractive forces begin to dominate over the repulsive forces. Thus, the pole tips 3 of the induction coils with core 2 are evenly distributed around the perimeter of the drill pipe 1. Then the constant current is turned off, the weight of the holder 7 articulated levers 5 return the device to its original position. The device is moved to a new point and the magnetization is repeated.

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After installing the magnetic marks along the length of the string of pipes 1, the amplitudes of the magnetic marks are recorded. Then the maximum permissible deforming load is applied to the column and the recording of the amplitudes of the magnetic marks is repeated. Compare both records of the amplitudes of the magnetic labels. In the free part of the pipe string, the magnitude of the magnetic marks decreases significantly or disappears, but remains unchanged in the stuck.

In the interval between the changed and unchanged amplitudes of the magnetic marks, the upper limit of the sticking is determined.

The introduction of at least one additional non-magnetic body 4 with an induction coil with a core 2 and pole pieces 3 makes it possible to create a uniform magnetization along the perimeter of the section of the drill pipe.

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The arrangement of like pole pieces 3 in the same direction allows the distribution of induction coils with cores 2 and pole pieces 3 equally around the perimeter of the drill pipe section at the time of insertion of the magnetic mark. The hinge connection of non-magnetic housings 4 with cable lugs 6 at one end and with the load carrier 7 at the opposite end ensures their mutual mobility and directionality of distribution along the perimeter of the drill pipe and returning to the starting position. and the carrier 7.

Thus, to apply a magnetic tag with a uniform and significant amplitude around the perimeter of the magnetized section of the drill pipe, several induction coils with core, pole tips and non-magnetic bodies are used, but not less than two in one direction and as they approach the body of the drill pipe are attracted to it. As a result of the mutual addition of the magnetic fields of the induction coils and their uniform distribution, a uniform magnetization is created

the entire perimeter of the magnetized section of the drill pipe.

The distribution of induction coils with a core and pole pieces along the perimeter of the drill pipe is carried out only by the energy of the magnetic field of the magnetizing elements of the device, and the return to the initial position is due to their own weight and load carrier. All this increases reliability by simplifying the design of the device and the technology of work.

Claims (1)

Invention Formula A device for determining the location of sticking of a pipe string containing a cable lug, a load carrier and a non-magnetic case in which an induction coil with a core and pole lugs is placed, in order to increase reliability in operation by simplifying the design and technology of work, it is equipped with an additional non-magnetic case in which an induction coil with a core and pole pieces is placed, and non-magnetic levers, with the pole tips of the same name being directed into and of the same direction, and each nonmagnetic housing pivotally coupled arms nonmagnetic one end with ferrule and another - with Cargo Holders. FIG. 2