RU2107147C1 - Pipe elevator - Google Patents

Abstract

FIELD: oil and gas production industry. SUBSTANCE: this relates to equipment used in subsurface repair of oil and gas wells and is intended for catching string of pump-compressor pipes and holding them suspended during round-trip operations. Pipe elevator has body which is pivotally connected with shackle, segment-type grip with control handle, and lock with supporting post. End face of lock and working face of supporting post have serrated surfaces which together create ratchet mechanism. Length of working face of supporting post is equal to or larger than value of working stroke of lock. End face of lock is kept in permanent contact with working face of post over entire length of working stroke, except handle position "Closed". Performance reliability of pipe elevator is achieved mainly due to preventing uncontrolled release of lock. EFFECT: higher efficiency. 4 dwg

Description

 The invention relates to equipment used in the underground repair of oil and gas wells, and is used to capture a column of tubing and tubing (tubing) and hold them in weight during tripping operations (STR).

 There are several modifications of pipe elevators designed to capture the tubing string and hold on weight during the STR. Pipe elevators contain a housing, an earring, a grip, a lock and a handle with a lock [1,2].

 Of the known closest to the claimed is an ETA type elevator containing a housing articulated with an earring, a retractable grip for pipes and a pivot handle connected to a lock rotary sleeve. The latch is located in the handle, made in the form of a spring latch [2], interacting with a vertical support column.

 A disadvantage of the known elevator is that the latch has three fixed positions: "Closed", "Intermediate" and "Open". This creates great inconvenience in the work, and the intermediate position of the latch is sometimes perceived by the operator as the "Closed" position, while spontaneous opening of the gripper and pipes fall on the operator’s platform.

 The technical problem solved by the invention is to increase the reliability of the elevator from the point of view of preventing spontaneous opening of the lock.

 The problem is solved in that the pipe elevator for gripping the tubing string and holding them on weight during tripping operations, comprising a housing articulated with an earring, as well as a segmented gripper with a control handle and a latch with a support column, has a structure in which the end face of the latch and the working face of the support stand have gear surfaces forming a ratchet mechanism, and the length of the working face of the support stand is equal to (or more) the magnitude of the working stroke of the latch, while the end face of the latch is It is in constant contact with the working face of the rack along the entire length of the working stroke, except for the position of the handle "Closed".

 The invention is illustrated by drawings, which depict: in FIG. 1 is a side elevator general view, FIG. 2 is a general elevator view in the direction of arrow A, FIG. 3 is a section along B-B, and the working face of the stand is shown from the side of the latch. It is indicated here: α is the angle of rotation of the handle with a latch; R-radius of rotation of the latch; L-length of the working face of the support column; d-diameter of the end face of the latch; t-step of the toothed surface of the working face of the support column and the end face of the latch; C-technological gap, Figure 4 is a section along BB.

 The elevator includes a housing 1, pivotally connected to the earring 2, a gripper 3, a handle 4, a spring-loaded latch 5 with a control lever 6, a support stand 7 with a gear surface on the working face 8. The end face of the latch 5 has a mating gear surface.

 The elevator works as follows. In the initial position, the elevator is closed. The handle 4 with the latch 5 at the same time occupy the extreme left position (shown by the dashed line in Figs. 2, 3 and 4), and the end face of the latch 5 is located outside the working edge 8, protrudes from the handle 4 to the maximum value, abutting the side surface against the support column 7, fixes the handle 4 from turning to the right.

 To translate the elevator into the "Open" position, push the latch 5 into the handle 4 using the lever 6 and turn the handle 4 to the right extreme position (shown in Fig. 2 by the main line), while the latch is in the recessed position. Next, the gripper 3 extends to enter the tubing.

 To translate the elevator to the "Closed" position, turn the handle 4 all the way to the left, while the end face of the latch will slip on the toothed surface 8 of the support rack 7 and will work as a gear pair of a ratchet mechanism. In the extreme left position of the handle 4, the latch 5 jumps off the gear surface 8 and is located behind the side face of the support column 7, fixing the handle 4 from turning to the right.

 If for some reason the operator does not bring the handle 4 to the extreme left position, and the latch 5 does not fit behind the side face of the support post 7, the ratchet mechanism will take over the stop function (toothed surfaces 8 and the end face of the latch 5) , preventing spontaneous disclosure of capture 3.

 The proposed elevator is characterized by great convenience in controlling the handle 4 and increased reliability from spontaneous opening of the gripper.

Claims (1)

 A pipe elevator for gripping a string of tubing and holding it on weight during tripping operations, comprising a housing articulated with an earring, as well as a segmented gripper with a control handle and a latch with a support stand, characterized in that the end face of the latch and the working the support strut have gear surfaces forming a ratchet mechanism, and the length of the working face of the support strut is equal to (or more) the magnitude of the working stroke of the latch, while the end face of the latch is in constant contact with the working face of the racks throughout the stroke length with the exception of the position of the handle, "Closed."

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