RU2376448C2 - String head screw up device - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production and geological research, meant for string head remote screw up. Includes base, installed on the string head flange, fixed on it socket, on which bottom cylindrical bore installed cylinder with rotation possibility, on the cylinder top cylindrical bore back installed tooth gear with rotation possibility, covered with a plate, installed inside of the cylinder, on which unit of hydro lines connection installed, on the socket external lateral surface fixed one side operating hydro cylinder for connection, at pressure absence, tooth gear with base, at that under plate fixed two plunger cylinders from the both sides, plungers executed in a middle part as tooth battens, located in plunger cylinders cases cuttings, for interaction with tooth gear.

EFFECT: work productivity and safety increase because of mechanised string head screw to casing string without use of drive mechanisms, also provided reliable sealing of screw connection.

5 dwg

Description

The invention relates to the oil and gas and exploration industries and is intended for remote inversion of the column head.

There is a method of turning the column head onto the threaded part of the casing by creating torque using a linkage system driven by traction mechanisms (tractor, winch) by means of rope equipment [1].

The known method has significant disadvantages:

- work is carried out, as a rule, in a mine well in a confined space with the use of bulky auxiliary mechanisms;

- when the column head is twisted, a bending moment occurs, the magnitude of which will depend not only on the magnitude of the pulling force, but also on the distance between the threaded connection and the point of application of this force;

- an increase in the specified distance leads to an increase in the magnitude of the bending moment, which can lead to the breakout of the threaded connection and the destruction of the thread both on the casing and in the column head.

The aim of the invention is the implementation of the installation of the casing heads with a device that allows for mechanized inversion of the casing heads on the casing of the well without the use of traction mechanisms.

The goal is achieved by a device for the inversion of the column heads, including a base mounted on the flange of the column head, fixed on the base of the socket, in the lower cylindrical bore of which a cylinder is mounted for rotation, on which a gear wheel mounted with the possibility of rotation is installed, closed by a plate installed a single-acting hydraulic cylinder is mounted on the cylinder on which the hydraulic line connection unit is fixed, on the outer side surface of the socket for communication, in the absence of pressure, the gear wheel with the base, while under the plate there are two plunger hydraulic cylinders fixed to it from two sides, the plungers of which are made in the middle part in the form of gear racks located in the cutouts of the plunger hydraulic cylinder bodies for interaction with the gear .

The design of the device is shown in FIG. 1, FIG. 2 is a view A of FIG. 1, FIG. 3 is a view B of FIG. 1, FIG. 4 is a device mounted on a column head of a well, and FIG. 5 is a view E of FIG. .four.

The device consists of a base 1, on which a socket 3 is fixed by bolts 2, in the lower cylindrical bore of which cylinder 4 is able to rotate around its axis. A gear 5 rotates on a cylinder 4 in the upper cylindrical bore of socket 3, which is covered from falling out by a plate 6, which is fixed on the cylinder 4 with a nut 7 locked from the flap with screws 8.

A single-acting hydraulic cylinder 9 is fixed on the outer side surface of the socket 3, the piston of which reciprocates under the action of the pressure of the working fluid supplied to the cylinder body through the fitting “B” and the spring 10 after the pressure is relieved.

In the absence of pressure, the piston of the hydraulic cylinder 9 under the action of the spring with the right end enters one of a number of holes 11 located in the “skirt” of the gear wheel 5, coupling the latter, when it rotates, with the base 1.

For fastening the device to the column head in the base 1, threaded holes 12 are made for installing the fingers 13. Holes are made on concentrically arranged diameters equal to the diameters of the pitch circles of the centers of the pin holes of the flanges of the screwed column heads.

Two plunger hydraulic cylinders 15, whose plungers are made in the form of a gear rack in the middle part and pistons with rubber sealing rings at the ends, are fixed to the plate 6 (Fig. 2) from two sides to its lower side by bolts 14. The bodies of the hydraulic cylinders 15 in the middle part have cutouts for engaging the gear 5 with the teeth of the plungers.

In the hydraulic cylinders 15 (Fig.3), the working fluid under pressure is supplied through the fittings "G" and "D" of the connection node for hydraulic lines 16 through pipelines 17.

Work at the wellhead using the proposed device is as follows (figure 4).

Four thumbscrews are manually screwed onto the threaded end of the wellhead casing 18 until they stop. The device is first suspended on a hook of the hoisting mechanism and into the lower part of the base 1, four fingers are screwed into the holes located by the diameter matching the diameter of the pin holes of the flange of the installed head casing. 13 (FIG. 1).

The device is lowered onto the column head 19, being inserted with fingers into the pin holes of the column head, and secured with nuts from the bottom.

High pressure hoses are connected from the hydraulic pump station to the fittings “B”, “G” and “D”.

The plate 6 of the device (Fig. 5) is fixed by anchoring the holes “G” and “Z” with steel ropes with tension forces “T” sufficient to prevent the device from turning around its axis during operation of the plunger hydraulic cylinders 15.

When the working fluid is supplied under pressure alternately into the fittings “G” and “D”, a synchronous reciprocating movement of the plungers of the hydraulic cylinders 15 occurs, which, with their gear racks, are meshed with the gear wheel 4, rotate it around the axis. In turn, the gear wheel 4, in the absence of pressure in the cavity of the hydraulic cylinder 9, rotates the base 1 of the device, thereby performing the operation of turning the column head.

When applying pressure to the fitting "B", the piston of the hydraulic cylinder 9 disengages from the gear 5 and its rotation occurs idle, without rotation of the base 1.

The magnitude of the torque depends on the magnitude of the pressure of the working fluid supplied to the hydraulic cylinders 15, and is controlled by the pressure gauge of the hydraulic installation.

The device can produce both inversion of the column head and its lapel without the presence of operational personnel in this zone.

The source of information

1. Information on analogues of the device for the inversion of the column heads at the enterprises performing work on the arrangement of wells in the oil and gas industry is missing.

Claims (1)

A device for inverting column heads, including a base mounted on a flange of a column head, fixed to the base of a socket, in the lower cylindrical bore of which a cylinder is mounted for rotation, on which a gear wheel mounted in the upper cylindrical groove is rotated, covered by a plate mounted on the cylinder, on which the connection unit of the hydraulic lines is fixed, on the outer side surface of the socket, a single-acting hydraulic cylinder is fixed for communication, in the absence of pressure Nia, the toothed wheel with a base, with a plate thereto on both sides two fixed hydraulic cylinder plunger, the plungers are made in the middle portion in the form of toothed racks, arranged in the recesses plunger housings of hydraulic cylinders, for interaction with the gear wheel.

Images