RU2176722C2 - Arrangement of well-head equipment - Google Patents

Abstract

FIELD: mining industry, oil and gas production. SUBSTANCE: arrangement includes column head, column cross and pipe head. Axis of central conduit of pipe head is displaced relative to central axis of column cross away from high-pressure cable lead-in by calculated value. Controllable non-return valve of hydraulic communication of hole clearance to conduit of working string is made in wall of column cross. Body of non-return valve is pressed into seat. Seat is made in wall of column cross. High-pressure cable lead-in is manufactured in the form of bushing with collar inside in one end and internal thread at the other end to accommodate pressure nut with tail that seals separate conductors of electric cable by split collars. Outer surface of bushing has annular grooves in which springy sealing rings are located. Pipe head has seat for installation and fixation of packing bushing by split spring bearing ring. EFFECT: simplified design of arrangement, reduced number of components, improved operational characteristics, simplified mounting and dismantling, prevention of valve freezing, reduced usage of metal for banding. 1 dwg

Description

 The invention relates to the field of mining, in particular to the oil and gas industry, to well equipment devices.

 Known devices for wellhead equipment containing wells, a conductor, a column head, a crosspiece of a column head, a pipe head and a Christmas tree with gate valves on strings [2].

 A disadvantage of the known devices is limited functionality.

 A device for wellhead equipment of wells is known, comprising a column head, a crosspiece of the column head, a pipe head, the axis of the central channel of which is offset from the central axis of the crosspiece of the column head by a certain calculated value, away from the high pressure cable entry [1].

 A disadvantage of the known device of the wellhead equipment of wells is the unreliability during operation and the increased elemental base of the structure.

 The technical task is to reduce the element base and expand the functionality of wellhead equipment, eliminate the possibility of freezing of a valve located separately on a string, simplify installation and dismantling of high pressure cable entry, reduce the metal consumption of the strapping and increase reliability during operation of the device at the well.

 The solution to the technical problem is achieved by the fact that the device of the wellhead equipment is equipped with an adjustable non-return valve in the annulus hydraulic communication channel with the working string channel made in the wall of the column head crosspiece, the check valve body is pressed into a socket made in the wall of the column head crosspiece and intersecting the hydraulic communication channel , the cable gland of high pressure is made in the form of a sleeve with a collar inside on one end and an internal thread on the other end for a pressure nut with a tail ohm for sealing the split sleeves individual wires electric cable, the outer surface of the sleeve are made annular grooves in which there are elastic seals, and holds the head pipe socket for mounting a sealing sleeve and fixing its split retaining ring.

 The drawing shows a device wellhead equipment wells, General view.

 In the drawing, planes are conventionally aligned in which sections are located along the cable entry sleeve and along the check valve body.

 The displacement of the axes of the tube head and the cross of the column head is indicated by Δ.

 The device of the wellhead equipment includes a column head 1, a crosspiece 2 of a column head, a pipe head 3, a valve 4, an electric cable 5, a nut with a tail 6, split sealing cuffs 7, washers 8, a sleeve 9, elastic sealing rings 10, an annular hydraulic connection channel 11 with a working string, check valve body 12, adjustable cover 13, liner seals 14, spring on the liner rod 15, valve 16, channel inlet 17.

 Installation of wellhead equipment elements is as follows.

 A crosspiece 2 of the column head is installed on the column head 1 with a check valve body 12, connected hydraulically to the channel 11. The valve 12 is closed by the adjustment cover 13 and contains a liner seal 14, a spring 15, a valve stem 16 connected to the inlet of the channel 17.

 By means of a quick coupling, the column head 1 is connected to the crosspiece 2 of the column head.

 Before connecting the electric cable 5 to the electric centrifugal pump, it is lowered through the high pressure cable entry socket in the tube head 3 and control operations are performed before the electric centrifugal pump is launched.

 The pipe head 3 is screwed onto the last tubing pipe (tubing) together with an electric cable.

 Before landing of the pipe head 3 with the tubing string into the crosspiece of the column head, the electric cable passing through the socket of the pipe head performs the operation of filling the cable seal in the sleeve 9 at the calculated tolerance size.

 Split cuffs with oblique cuts 7 and washers 8 are installed in the sleeve 9 around each cable core and sealed with a nut with a tail 6.

 The tube head 3 with a tubing string, with an electric centrifugal pump with an electric cable, is unloaded onto the landing cone and the sleeve 9 with elastic sealing rings 10 is inserted into the socket of the cable entry of the tube head and fixed with a snap spring split ring.

 A quick-disconnect connection of the pipe head 3 with the tubing string and a sealed electrical cable is connected to the crosspiece of the column head.

 During operation, the valve 16 is adjusted by means of the adjusting cover 13, compressing or expanding the spring 15.

 Dismantling is carried out in the reverse order.

 Before lifting the tube head 3 with the tubing string, a snap spring split ring, a sleeve 9 with elastic sealing rings 10 by the tail of the nut 6 are dismantled.

 The cable entry is disassembled and the cable is wound onto a drum.

 New technical solutions provide novelty, a significant difference between the wellhead equipment and allow you to use the device as a standard for various wells with different production methods, i.e. use as a fountain fittings for gushing wells, as a fittings for wells equipped with sucker rod pumps with a rocking machine, or for mechanical extraction using electric centrifugal pumps.

 Without the proposed new technical solutions for wellhead equipment, the well will be idle due to poor performance requirements.

 At present, in oil and gas fields, well equipment contaminated by oil smudges, production operators are forced to steam off and at the same time waste working time.

 Environmental and fire safety services constantly issue acts and regulations for fines to mining departments.

 This happens in all fields.

 The main reason for this problem is a design flaw and, as a consequence, the unreliability of the downhole equipment supplied both by domestic enterprises and from abroad.

 The company does not offer new technical solutions.

 In the proposed device of the wellhead equipment of the wells, in comparison with the analog, the control of sealing the cable cores is carried out in stationary conditions, which allows to ensure reliable tightness of the cable entry of high pressure in the well.

 A built-in bypass adjustable valve in the wall of the crosspiece of the column head simplifies the construction of wellhead equipment and eliminates the need for a technological string with shut-off devices and a valve.

 The built-in valve in the wall of the crosspiece of the column head is constantly under the influence of the positive temperature regime of the pumped liquid.

An example of a device for wellhead equipment is characterized by the following parameters:
hydraulic communication channel in the wall of the crosspiece of the column head for at least 15 minutes;
valve length ≈ 65 mm;
heat transfer from the axis of the working string to the valve occurs approximately along a wall with a thickness of 35 mm at a distance of 60 mm;
the socket for the cable entry sleeve is approximately 45 mm;
cable entry working pressure 35.0 MPa. The effort of mounting and dismantling the cable entry is about 5 kgf.

 Compared with the analogue, the proposed device for well equipment will find wide application in the fields due to the low cost, reliability, interchangeability for various types of wells, light weight and ease of assembly.

 All elements of the proposed device are competitive and can find a sales market abroad.

 The use of the wellhead equipment of wells in existing wells and newly commissioned will allow to obtain a positive technical and economic effect.

 The price of the proposed device for wellhead equipment is half less than the well-known execution devices by enterprises in Baku, Kympinov Romania, Kubota firm in Japan, and E.M.S. in the United States, the Voronezh Mechanical Plant, the Chelyabinsk Plant "Stankomash" and the Yugokamsk Machine-Building Plant named after Lepsi.

 A preliminary design of the proposed device for wellhead equipment was considered by specialists of Surgutneftegas OJSC.

 According to protocol N 115 of 08/19/1996, a decision was made on the advisability of experimental design work on the development of small-sized fountain fittings.

Sources of information
1. Asfandiyarov H.A. and other oil and gas manifestations and open fountains during the operation of wells.- M .: Nedra, 1986, p. 84-85
2. SU 1776290 A3, 11/15/1992.

Claims (1)

 An apparatus for wellhead equipment comprising a column head, a crosspiece of a column head, a pipe head, the axis of the central channel of which is offset from the central axis of the crosspiece of the column head by a certain calculated value, away from the high pressure cable entry, characterized in that it is equipped with an adjustable hydraulic check valve an annulus with a working string channel made in the wall of the crosspiece of the column head, the check valve body is pressed into the socket made in the walls a cross of the column head crossing the hydraulic communication channel, the high pressure cable entry is made in the form of a sleeve with a collar inside on one end and an internal thread on the other end for a compression nut with a shank to seal with split cuffs of individual cores of the electric cable, ring grooves are made on the outer surface of the sleeve in which the elastic sealing rings are located, and in the pipe head there is a socket for installing the sealing sleeve and fixing it with a split spring support ring.