RU2227200C2 - Device for fixing and removing devices used in wells - Google Patents

Abstract

FIELD: oil and gas extraction industry. SUBSTANCE: device has removable part, made in form of flat hollow spring fork with projecting teeth for interaction with lower facets of stopping prism. Hollow flat cantilever spring anchor is equipped with holding fingers and hooks. Hooks are latched to holding fingers and have projections for assuring simultaneous operation in case of action on one of said hooks. Stopping prism is connected to the holder of well devices made in shape of U-shaped divergent fork. EFFECT: increased reliability of operation, simplified operation process due to absence of maintenance before each lowering into a well. 7 dwg

Description

The invention relates to the field of oil and gas production, and in particular to technical means for hydrodynamic research of wells, and can be used for lowering downhole tools, fixing them at a predetermined depth in the tubing couplings, disconnecting them from the cable technique at which the device was lowered, and extracting from the well using a catcher.

A device for lowering and retrieving borehole objects is known (RF Patent No. 2124111), containing a hollow body with longitudinal slots and windows, inside which a spring-loaded rod with a variable cross section and a pin is installed, which allows lowering and removing borehole objects, but not ensuring their fixation at a given depth .

A device for securing cargo in a well (Author's certificate No. 1033721) is provided, comprising a body, a transportation unit, a latch, an extraction mechanism that allows lowering, securing the load on any part of the tubing and disconnecting from the cable technology on which the device was lowered into the well .

The disadvantage of this device is the presence of shear elements, which must be reinstalled before each descent into the well.

The closest in technical essence (prototype) is Well Tols (US Patent No. 2908333), containing a spring-loaded expandable anchor with a U-shaped clamp fixed to it, a locking sleeve and a detachable head for attaching to the cable technique.

The disadvantage of this device is the use of shear pins to disconnect the head fixed to the cable technology from the anchor fixed in the coupling of the tubing string.

The aim of the invention is to provide a device that allows using a wireline technique to launch downhole tools, fixation at a predetermined depth in the couplings of the tubing string with disconnection from the cable technology and allowing extraction from the well.

The positive effect of using the invention is to increase the reliability and simplify the application process due to the lack of restoration work before each descent into the well.

This goal is achieved in that the device comprises a detachable flat hollow spring fork attached to the cable technique with protruding teeth for interacting with the lower faces of the locking prism, while the protruding teeth engage the flat hollow spring fork with a flat hollow cantilever spring anchor, which is equipped with holding fingers and hooks symmetrically located in the lower part on the axes of rotation, which are fastened on the holding fingers and have protrusions that provide simultaneous actuation upon exposure to one of the hooks, the locking prism is connected to the downhole tool holder, made in the form of a U-shaped deflecting fork, and is rigidly connected with a bolt passing through the hole in the upper part of the flat hollow cantilever spring anchor, the head of which provides a catch with a catcher to remove the device from the well.

These design solutions increase the reliability of the device when it is fixed in the tubing coupling and simplify the process of its application, eliminating the need to replace parts when preparing the device for operation.

The invention is illustrated by drawings, where:

figure 1 - shows the device in transport position during descent into the well;

figure 2 - shows a left view of the device in the transport position during descent into the well;

figure 3 is a horizontal view in section aa in figure 1;

figure 4 is a horizontal view in section bB in figure 1;

figure 5 - position of the hooks during descent into the well (an enlarged view of the node 1 in figure 1);

Fig.6 - the position of the hooks after fixing the anchor (an enlarged view of the node II in Fig.7);

Fig.7 shows the device after fixing the anchor and detachable detachable flat hollow spring fork.

A device for fixing and disconnecting downhole tools (Fig. 1) includes a cable head 1 mounted on a detachable part consisting of a sleeve 2 with a flat hollow spring fork 3 having protruding teeth 4, a flat hollow cantilever spring anchor 5 with holding fingers 6 and axles rotation 7, hooks 8, locking prism 9, clamping bolt 10, axis 11, holder of downhole tools 12.

The detachable part is a flat hollow spring fork 3 made on the sleeve 2 with protruding teeth 4, inserted into the holes on the end of the upper part of the flat hollow spring anchor body 5 and located in the grooves of the locking prism 9. In this case, the protruding teeth 4 abut against the lower faces of the locking prism 9 and prevent the separation of the detachable part and the flat hollow cantilever spring anchor 5.

In the lower part of the outer surface of the flat hollow cantilever spring anchor 5, protrusions are made for fixing in the groove of the coupling 13 of the tubing, the lower plane of the protrusions perpendicular to the axis of the coupling, and the upper one makes an angle of 45 ° with it. The lower parts of the springs of the flat hollow cantilever spring anchor 5 have milled grooves in which the holding fingers 6 are located, as well as the axis of rotation 7 with hooks 8 mounted on them, fastened on the holding fingers 6, while the ends of the hooks 8 abut against the walls of the tubing and protect the protrusions of the flat hollow spring anchor 5 from impacts on the edges of the tubing when the device is lowered into the well. The hooks 8, which are mirrored relative to the axis of the tubing, have protrusions 14 near the axis of rotation 7 (FIG. 5), which ensure that the hooks 8 are mutually dropped from the holding fingers 6 when one of them is dropped.

In the retaining prism 9, a clamping bolt 10 is fixed, which holds the retaining prism 9 inside the flat hollow cantilever spring anchor 5. The head of the clamping bolt 10 is made in the form of a cone with a step that allows it to be caught by the catcher when removing the device from the well.

On the axis 11 passing through the retaining prism 9, the holder of the downhole tools 12 is threaded for attachment of the downhole tool. The deviation of the holder of the downhole tool 12 is necessary to prevent the device from skewing when descending into deviated wells, as well as to facilitate installation and removal of the device from the lubricator.

The device operates as follows.

Before the device is lowered into the well, a flat hollow spring fork 3 attached to the cable head 1 is inserted into the holes on the end in the upper part of the housing of the flat hollow spring anchor 5 until it stops, while the protruding teeth 4, sliding along the grooves on the locking prism 9, are under the lower faces of the latter, then compress the springs of the flat hollow cantilever spring anchor 5, thereby compressing the flat hollow spring fork 3, as a result of which the protrusions on the flat hollow spring fork 3 engage with the lower faces of the retainer prisms 9. Having fixed the springs of the hollow cantilever spring anchor 5 in this position, fasten the hooks 8 on the holding fingers 6 and, having attached the downhole tool to the holder 12, lower the device into the well, while the hooks 8 slide along the inner walls of the tubing. At a given depth, the descent is stopped and the ascent begins. When they reach the junction of the tubing, the hooks 8 fall into the groove in the sleeve 13, abut against the upper side of the groove and, moving around the axis of rotation 7, are pulled off from the holding fingers 6, while the springs of the flat hollow cantilever spring anchor 5 are straightened and located on external protrusions of them enter the grooves in the coupling 13 (Fig.7). When straightening the springs of the flat hollow cantilever spring anchor 5, the springs of the flat hollow spring fork 3 also straighten and the teeth 4 located on its surfaces disengage from the lower faces of the locking prism 9, allowing the flat hollow spring fork 3 to move upward along the grooves of the locking prism 9. Detachable part is pulled out of the body of the flat hollow cantilever spring anchor 5 and together with the cable head 1 is removed from the well. After detaching the detachable part from the flat hollow cantilever spring anchor 5 fixed on the coupling 13, the head of the clamping bolt 10 is exposed, allowing it to be caught by a catcher to remove the device from the well using cable technology.

Sources of information

1. RF patent No. 2124111, 1997

2. Copyright certificate No. 746092, 1997

3. US patent No. 2908333, 1956

Claims (1)

A device for fixing and disconnecting downhole tools, comprising a detachable part, a flat hollow cantilever spring anchor with holding fingers located at the bottom of the consoles of the flat hollow cantilever spring anchor hooks, a locking prism fixed inside the flat hollow cantilever spring anchor, the downhole tool holder, characterized in that that the detachable part contains a flat hollow spring fork with protruding teeth for interaction with the lower faces of the locking prism, while the holder the downhole tool is made in the form of a U-shaped deflecting fork and connected to a locking prism, and the hooks are fastened on the holding fingers of a flat hollow cantilever spring anchor and have protrusions that provide simultaneous operation when exposed to one of the hooks.

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