RU122429U1 - DEVICE FOR Dismantling the mouth of the cross - Google Patents

Abstract

A device for dismantling a wellhead cross, containing a faceplate of a wellhead cross and a universal branch pipe, characterized in that it additionally includes a metal mounting plate having a square axial hole, holes for mounting bolts and side handles rigidly connected to the plate, and a tip is welded to the lower end of the universal branch pipe in the form of a parallelepiped having a square at the base that coincides with the square of the axial hole of the mounting plate.

Description

The utility model relates to equipment for the oil and gas industry and can be used to mechanize the process of dismantling the wellhead cross during the repair of wells.

When carrying out underground well repairs, namely

- when replacing the wellhead cross in connection with the expiration of the term of operation;

- during preparatory-final work during the perforation;

- during the audit of wellhead valves;

- when building the pipe column;

- when staging the production string, the wellhead cross is dismantled. When replacing the estuarine crosspiece, problems arise regarding its lapel, due to structural characteristics that create inconvenience in dismantling this armature.

Requirements and scope of work on the overhaul and current repair of wells at OAO TATNEFT are set forth in the guidance document developed by the TatNIPIneft Institute [1].

In accordance with this document, the process of dismantling wellhead equipment refers to the preparatory work for underground repair of wells (hereinafter referred to as ORS) and is carried out manually using various tools, such as scrap, chain keys, etc. Due to the low efficiency and inadequate use of labor, as well as the large time costs, auxiliary special equipment (bulldozer, tractor, etc.) is additionally involved at this stage. The operation of dismantling the wellhead cross is as follows.

Since the wellhead cross is located above the production casing and connected to it by an internal threaded connection by means of a coupling and a pipe, for its dismantling it is necessary to carry out untwisting rotational movements. The critical point in this procedure is “stragging” from the wellhead position of the wellhead cross within the coupling joint that has been established during the operation of the well. Carrying out this operation requires a lot of effort, for which special equipment is involved. To do this, one end of the tow rope is mounted on the outlet of the wellhead crosspiece, and the other is attached to the bulldozer. When the bulldozer moves, the wellhead cross is rotated about its axis - not more than 10-15 degrees in order to avoid a break in the protruding parts of the cross. Then the cable is re-hooked, and this operation is repeated until the free passage of the wellhead cross is achieved inside the coupling connection. Further actions are carried out manually - until the lapel and the dismantling of the estuarine cross are completely lapel. The inversion of the wellhead cross occurs in the reverse order.

The objective of the proposed utility model is to create a special device to reduce transport costs, simplify and reduce the duration of the process of dismantling the wellhead crosspiece, as well as increase the level of industrial safety of staff at the workplace.

The technical result is the creation of the proposed device is sufficient in magnitude of the torque, providing "straganie" wellhead crosses inside the coupling threaded connection due to the resulting circumferential force.

The proposed device consists of a universal pipe with a welded tip in the form of a parallelepiped having a square in the base, and a metal mounting plate (thickness 15-20 mm) having a square axial hole, as well as holes for fixing bolts M20 × 150 (at least 4 pcs. ) and side handles rigidly connected to the plate and designed to be gripped by hands when collecting the proposed structure at the wellhead.

The device is illustrated by figures 1, 2, 3 and is used as follows.

Before the production of underground repair of the well, the PRS team moves to the well and installs the lifting unit. Next, the borehole fittings are disassembled, plugs are installed on the manifold line, HKSH hydraulic key is installed at the wellhead, and the downhole pumping equipment and tubing are lifted.

After extracting the downhole pumping equipment and tubing from the well, the wellhead crosspiece remains at the mouth, which must also be dismantled from the coupling connection by means of a flap.

To do this, on the faceplate of the wellhead cross 7 (Fig. 3) with mounting bolts (at least 4 pcs.), A mounting plate 1 is mounted with side handles (Figs. 1, 3) and an axial hole of square shape 2 (Fig. 1). The side handles, rigidly connected to the mounting plate, are used as an auxiliary element when placing the mounting plate on the mouth plate of the wellhead cross.

Further, using the ETA-50 elevator (not shown in the drawing), the universal pipe 3 (Fig. 2, 3) rises to open the wellhead crosspiece 7 (Fig. 3). To capture the pipe with the ETA-50 elevator, there is a sleeve 4 in its upper part (Fig. 2, 3), and in the lower part a parallelepiped-shaped tip with a square base 5 (Fig. 2), matching the square axial hole 2 of the mounting plates 1.

The universal pipe 3 is inserted into the axial square hole 2 of the mounting plate 1 and, using the GKSh hydraulic key (not shown in the drawing), is rotated to turn the sleeve threaded connection 6. Due to the fact that the mounting plate 1 has a rigid bolt connection with the faceplate of the wellhead cross 7, rotation of the design "universal pipe - mounting plate - wellhead crosspiece". Depending on the direction of rotation, you can make a lapel or inversion of the wellhead cross.

OAO TATNEFT manufactured and successfully tested the proposed device during repair work related to the opening of the wellhead cross. It is planned to introduce the proposed device for dismantling the wellhead cross in 2012 and subsequent years during repairs at the wells of OAO TATNEFT.

[1] - Collection of typical technological processes during the repair of wells of OAO Tatneft (RD 153-39.1-408-05). TatNIPIneft OAO Tatneft. Bugulma. 2005.126 s.

Claims (1)

A device for dismantling the wellhead crosspiece containing the faceplate of the wellhead crosspiece and a universal pipe, characterized in that it further includes a metal mounting plate having a square axial hole, holes for mounting bolts and side handles rigidly connected to the plate, and a tip is welded to the lower end of the universal pipe in the form of a parallelepiped having a square in the base coinciding with the square of the axial hole of the mounting plate.