RU157182U1 - CATCHER OF A GEOPHYSICAL INSTRUMENT IN A WELL - Google Patents

Abstract

A geophysical instrument catcher in the well, comprising a housing, in the upper part of the housing is equipped with an adapter for connecting to the pipe string, and in the lower part of the housing, a grip and a bell are made, characterized in that an inner cylindrical groove is made in the lower part of the housing with a grip made in it in the form of three fishing rings with cut and bent inward petals, while the inner diameters of fishing rings on bent petals are reduced from the bottom up, and the fishing rings are installed in the inner a cylindrical sample of the case with a gap allowing them to rotate relative to the case and each other, and the bell bottom is equipped with a winding hook and serrated notches.

Description

The proposal relates to the oil and gas industry and can be used in fishing operations, in particular for capturing and retrieving geophysical instruments from a well.

Known downhole tool catcher (patent for utility model RU No. 56943, IPC E21B 43/00, published on 09/27/2006 in Bull. No. 27), comprising a housing with a socket for the tool shank, a nozzle with a feed cone, the nozzle being provided an internal cylindrical groove, in which a grip is made, made in the form of two dies in the shape of half rings, provided on the inner surface with inclined sections tapering from the bottom up, while the dies are spring-loaded inside by a spring plate made in the shape of an oval.

The disadvantages of this device are:

- firstly, the restriction on the outer diameter of the capture of the geophysical instrument. This is due to the fact that the device allows you to capture the geophysical device in a strictly defined interval of the outer diameter, for example, 40-60 mm and does not allow you to capture the geophysical device in the well with a larger or smaller outer diameter from the above, i.e. less than 40 mm and more than 60 mm;

- secondly, the low reliability of the gripping design, due to the presence of dies spring-loaded inside the spring plate. Under the action of mechanical force on the dies during the capture of the device, a spring plate may break and the device will fail;

- thirdly, it does not allow loosening and removing sludge plugs, clay cake, which can be littered with the geophysical instrument due to the impossibility of washing.

The closest in technical essence and the achieved result is a device catcher in the well (utility model patent RU No. 70925, IPC E21B 31/00, published on 08/20/2008 in Bulletin No. 23), containing a housing, an adapter in the upper part of the housing for connecting to a pipe string or cable, in the lower part of the housing there is a grip and conical guide, while the adapter is pivotally connected to the housing.

The disadvantages of this device are:

- firstly, the restriction on the outer diameter of the capture of the geophysical instrument. This is due to the fact that the device allows you to capture the geophysical device in a strictly defined interval of the outer diameter, for example, 40-60 mm and does not allow you to capture the geophysical device in the well with a larger or smaller outer diameter from the above, i.e. less than 40 mm and more than 60 mm;

- secondly, the low reliability of the capture, due to its structural design, which does not allow fixing the device inside the capture. Under the action of mechanical force, the device enters the grip, crushing the conical edges of the grip, since the grip does not have the possibility of radial expansion inside the housing when passing through it catchable device. This leads to breakage of the grip and to the failure of the device, therefore, when lifting the device, the device freely leaves the grip;

- thirdly, it does not allow loosening and removing sludge plugs, clay cake, which can be littered with the geophysical instrument due to the impossibility of washing.

The technical task of the proposal is to develop a universal catcher design that allows you to remove the device with any outer diameter, as well as improving the reliability of the capture with the possibility of loosening and cleaning the "head" of the geophysical device from sludge and clay crust before capture.

The problem is solved by a geophysical instrument catcher in a well containing a body, in the upper part of the body is equipped with an adapter for connection to the pipe string, and in the lower part of the body, a grip and a bell are made.

What's new is that the case is hollow, and in the lower part of the case there is an internal cylindrical groove with a grip placed in it, made in the form of three fishing rings with cut and curved inward petals, while the inner diameters of the fishing rings along curved petals are reduced from bottom to top, moreover, fishing rings are installed in the inner cylindrical sample of the housing with a gap allowing them to rotate relative to the housing and each other, and the bell is equipped with a winding hook and gear notches.

The figure 1 schematically shows the proposed catcher of the geophysical instrument in the well.

Figure 2 schematically shows a petal cut in a fishing ring and bent inward.

The figure 3 shows a cross section aa of the catcher of a geophysical instrument in the well along the fishing ring.

The catcher of the geophysical instrument in the well contains a housing 1 (see Fig. 1) made hollow, in the upper part of the housing 1 is equipped with an adapter 2 for connection to the pipe string (not shown in Fig. 1, 2, 3), in the lower part of the housing 1 (see Fig. 1) made capture 3 and bell 4.

In the lower part of the housing 1, an inner cylindrical groove 5 is made with a gripper 3 located in it, made in the form of three fishing rings 6 ′, 6 ″, 6 ′ ″ with cut and bent inward petals (see Figs. 1 and 2, 3), for example, made in the amount of three pieces 7 ′, 7 ″, 7 ′ ″, in the corresponding fishing rings 6 ′, 6 ″, 6 ′ ″.

Inner diameters d ₁ ; d ₂ ; d ₃ , respectively, of fishing rings 6 ′, 6 ″, 6 ″ along the corresponding curved petals 7 ′, 7 ″, 7 ″ decrease from the bottom up.

Fishing rings 6 ′, 6 ″, 6 ″ are installed in the inner cylindrical sample 5 of the housing 1 with a clearance-S (see Fig. 1), allowing them to rotate relative to the housing 1 and each other, for example, the gap S = 5 cm = 0.05 m. The bell 4 is equipped with a winding hook 8 below, for example, made in the form of an arcuate cutout on the lower end of the bell 4 and serrated notches 9.

The device operates as follows.

The catcher (see figure 1) at the wellhead is connected to the drill pipe string using an adapter 2 and lowered into the well. A geophysical device, then a device located in the well and to be removed from the well, as a rule, is inclined and rests with the upper part on the wall of the well. When the device is reached, the bell 4 rests on its upper part, which can be littered with sludge or covered with clay peel, therefore, the drill pipe string and, accordingly, the catcher from the wellhead are rotated with simultaneous direct washing through the drill pipe string through the hollow body 1 and lowering the drill pipe string . As a result, the serrated notches 9 are loosened first, cleaning the “head of the geophysical instrument from sludge and clay cake, and the winding hook 8 directs the upper end of the instrument into the bell 4.

The possibility of flushing due to the presence of a hollow body 1, along with making serrated notches at the lower end of the bell 4, allows loosening the rock in the borehole and cleaning the sludge plug, clay cake before capture, with which the geophysical instrument to be removed can be littered.

Flushing is stopped, and the rotation of the drill pipe string continues with its lowering. The upper end of the device first moves along the bell 4, the inner surface of which is made in the form of a conical surface, tapering from the bottom up, and then the device falls into the grip 3, made in the form of three fishing rings 6 ′, 6 ″, 6 ′ ″ (see Fig. 1 and 2, 3) with cut and bent inward petals 7 ′, 7 ″, 7 ′ ″.

In capture 3, depending on the outer diameter of the device, it moves upward and is captured by the petals 7 ′, 7 ″, 7 ′ ″ by one of its three fishing rings 6 ′, 6 ″, 6 ″. For example, there is a capture of the geophysical instrument 10 (conventionally shown in FIG. 3) by the petals 7 ″ of a fishing ring 6 ″ of diameter d ₂ (see FIG. 3).

The design of the device catcher in the well has a universal design, since the capture is made in the form of three fishing rings with diameters (d ₁ ; d ₂ ; d ₃ ) of the petals 7 ′, 7 ″, 7 ′ ″ decreasing from the bottom up (see Fig. 1 and 3), bent inwardly respectively fishing rings 6 ′, 6 ″, 6 ″, which allows you to remove the geophysical instrument with almost any outer diameter.

The petals 7 ′, 7 ″, 7 ″ ″ are bent inside the corresponding fishing rings 6 ′, 6 ″, 6 ″ smaller than the outer diameter of the device, so the latter freely penetrates the fishing rings 6 ′, 6 ″, 6 ″.

When the trap is subsequently lifted upward on the drill pipe string, the lobes 7 ′, 7 ″, 7 ″ under the weight of the geophysical instrument themselves take the desired shape, ensuring the geophysical instrument is trapped in the borehole by the trap, thereby increasing the reliability of the capture 3.

Due to the clearance - S, the fishing rings 6 ′, 6 ″, 6 ″ have the possibility of axial movement and rotation relative to the housing 1 and relative to each other, which contributes to the unhindered movement of the captured geophysical instrument inside the capture 3 with less effort in comparison with the prototype

After that, the drill pipe string with the catcher is removed from the well together with the device fixed in the gripper 3.

The proposed catcher geophysical instrument in the well allows you to:

- loosen and clean the "head" of the geophysical instrument from sludge and clay cake before capture;

- remove the device with any outer diameter,

- increase the reliability of the capture.

Claims (1)

A geophysical instrument catcher in a well containing a housing, in the upper part of the housing is equipped with an adapter for connecting to the pipe string, and in the lower part of the housing, a grip and a bell are made, characterized in that an inner cylindrical groove is made in the lower part of the housing with a grip made in it in the form of three fishing rings with cut and bent inward petals, while the inner diameters of fishing rings on bent petals are reduced from the bottom up, and the fishing rings are installed in the inner a cylindrical sample of the case with a gap allowing them to rotate relative to the case and each other, and the bell bottom is equipped with a winding hook and serrated notches.

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