RU197004U1 - Downhole Catcher - Google Patents

Abstract

The utility model relates to the field of the oil and gas industry and can be used for capture at the wellhead and subsequent retention of downhole instruments. The catcher contains a cylindrical body with a movable stop, in the lower part of the body in non-through longitudinal grooves located grippers are made with a displaced center of gravity, installed through holes and fixed with a ring, the stop is spring loaded from above with one spring. The catcher consists of a small number of parts; it is easy to manufacture and assemble. Installation and dismantling of the catcher takes the minimum time, without the need for a special tool. 1 ill.

Description

The utility model relates to the field of the oil and gas industry and can be used for capture at the wellhead and subsequent retention of downhole instruments.

A downhole catcher is known from the technical field [RU 47426, published on August 27, 2005], which is a body with a lead-in cone, spring-loaded with grippers made in the form of pointed grips fixed pivotally. A disadvantage of the known catcher is the lack of reliability of the catcher, which is associated with the execution of the catches of the catcher spring-loaded, pivotally fixed.

The closest in technical essence to the claimed technical solution is a catcher [RU 94622, published May 27, 2010], adopted as a prototype containing a cylindrical body, a movable stopper arranged in the form of a cylinder mounted coaxially with a clearance relative to the top the end face of the housing, springs are installed in the upper part of the stopper, the inner guide cone under the shank of the device is made in the lower parts of the housing and the stopper, spring-loaded grips are located in the lower part of the housing in eskvoznyh longitudinal grooves symmetrically with respect to the through-groove and fixed therein by means of axes, the lower ends of the grippers extend beyond the lower end of the body, and abut the upper ends of the stopper in the external dihedron.

The disadvantages of the prototype are

- the complexity of the design of the grips of the wellhead catcher, due to the large number of component parts, unreliable operation of the articulation of the grippers with their simultaneous springing;

- difficulty in assembling the design of the catcher grips, due to the large number of parts.

The objective of the utility model is the creation of a downhole catcher with a minimum number of parts, the implementation of the gripping unit without springing and the absence of unreliable articulation.

The technical result consists in increasing the life of the catcher due to the grippers used in the catcher, made with a displaced center of gravity, without articulation, and without the use of spring-loaded grippers.

The technical result is achieved by the fact that the downhole trap containing a cylindrical body with an internal guide cone located inside the body by a movable stopper, in the lower part of which is made an internal guide cone under the shank of the device and grippers located in the lower part of the body in non-through longitudinal grooves according to the utility model made with a displaced center of gravity, installed through holes in the longitudinal grooves of the housing, fixed with a ring threaded through each grip and laid in the groove of the housing, and the stopper is spring loaded from above with a single spring.

The utility model is illustrated in the drawing, which shows a General view of the downhole catcher with a held device.

The downhole catcher consists of a cylindrical body 1 with three longitudinal grooves 2 for installing grippers 3, a thread 4 is made on the upper part of the body 1 for mounting the catcher body in the lubricator plug, the lower part of the body 1 has an inner guide cone 5 under the body of the depth tool, tapering from bottom to top ; on the outer part of the housing 1 there is a groove 6, for installing the ring 7; the stopper 8 has a cylindrical shape and is installed in the inner upper part of the housing 1, one spring 9 is installed on the upper part of the stopper 8, the lower inner part of the stopper 8 has an inner guide cone 10 for centering the shank of the device, tapering from the bottom up; the grippers 3 are installed in the longitudinal grooves 2 of the housing 1 and are fixed with the help of a ring 7 threaded through the holes 11 made in each grip, the ring 7 is thus laid in the groove of the housing 1, thus being fixed from movement. The grips 3 in the upper part have a displaced center of gravity relative to the hole 11, causing the grips to shift to the central axis of the housing.

The catcher works as follows.

The catcher is mounted in the plug of the lubricator using the threaded part 4. A steel wire (not shown) is passed through the catcher. The catcher is mounted with a deep device fixed to the wire. The catcher and plug of the lubricator are assembled and mounted on top of the lubricator. In the absence of the device in the catcher, the grippers 3 with the upper part, under the influence of the shifted center of gravity, are shifted to the central axis of the catcher, and when the stopper 8 is in the lower position, they abut against its outer surface. When lifting on a steel wire a device having a shank with a conical head and an annular groove, the device is oriented inside the center of the catcher using the internal guide cone 5, and then moves upward until it hits the inner cone 10 of the stopper 8, thereby compressing the spring 9. When moving the stopper upward, above the contact points of the grippers 3 with the stopper 8, the ends of the grippers are shifted towards the central axis of the housing 1 due to the displaced center of gravity, go under the cylindrical groove of the shank of the device, spring 9 p and this pushes the stopper 8 in the reverse direction down device presses the tail to the grippers 3, thereby holding device from falling out in the case of steel wire breakage under strong shock. To remove the held device, the lower protruding parts of the grippers 3 are compressed towards the axis of the housing, as a result, the upper ends of the grippers 3 are moved apart from the axis of the housing, the spring 9 moves the stopper 8 to the lower position, pushes the captured shank of the device down. The upper parts of the grippers 3 occupy the initial position on the outer surface of the stopper 8.

The inventive utility model consists of a small number of parts, does not have a large metal consumption, and is easy to manufacture and assemble. Installation and dismantling of the catcher takes the minimum time, without the need for a special tool. The absence of articulated joints and springs in the design of the catcher for spring-loaded grippers allows avoiding the catcher malfunction caused by breaking the springs from jamming or abrasive action, which increases the reliability of the catcher and, accordingly, its service life.

Claims (1)

A downhole catcher comprising a cylindrical body with an internal guide cone located inside the body by a movable stopper, in the lower part of which an internal guide cone is made under the shank of the device, and grippers located in the lower part of the body in non-through longitudinal grooves, characterized in that the grippers are offset center of gravity, installed through holes in the longitudinal grooves of the housing, fixed with a ring threaded through each grip and laid in the groove of the housing, and the stopper is spring-loaded on top of a single spring.

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