RU36428U1 - Universal wellhead - Google Patents

Description

Object-device Universal wellhead wellhead

The utility model relates to the oil industry, in particular to oil equipment, namely, shutoff valves and can be used to equip the mouth of oil and gas wells operated by electric submersible and sucker rod pumps.

Wellhead constructions are known in which, in order to reduce the overall dimensions, weight and number of locking devices, a three-way tap with a conical or spherical stopper is used instead of the Christmas tree cross and two locking devices installed on its lateral branches.

The three-way valve has three working positions and allows you to direct the flow of the medium, depending on the need, along the right or left branch, or along both branches simultaneously.

However, these valves along with obvious advantages are characterized by disadvantages, which are as follows:

- at the time of maximum product selection on both lateral branches, there is no possibility of carrying out various technological operations associated with the descent of devices, tools and fixtures through the valve stem, since in this position of the crane the valve stem is blocked;

- the lack of self-sealing in the position when both lateral branches are blocked, practically makes it impossible to close the well without using a barrel shutoff device;

- when turning the cork (changing position), the sealing surfaces of the latter are directly affected by the flow of the medium, which leads to their rapid wear.

E 21 V 33/03

However, the design of this armature is complex, has large dimensions and metal consumption.

Armature of the mouth of oil and gas wells is also known, containing a corne in the form of a flange with bends on the upper end surface, in which lateral exits from the central channel and annulus are located, locking bodies and seal assemblies, and the axis of the lateral exits are placed in one horizontal plane (2 )

The disadvantages of this valve are the low reliability and stability of the valve, the complexity of the repair and installation and dismantling.

Closest to the claimed utility model is wellhead fittings, which we adopted as a prototype, containing a housing, a pipe holder with a research hole, a wellhead tee, a gas outlet, flow line and an annulus with valves, a check valve and a threaded spindle (3).

The disadvantages of wellhead valves are low reliability, the inability to use it with electric centrifugal pumps (ESP), as well as for piezometric wells.

The purpose of the utility model is to eliminate the above drawbacks and increase the reliability of valves during repairs while facilitating installation and dismantling, and its use in the operation of piezometric wells. In addition to this, it becomes possible to reduce weight, dimensions and increase the stability of the reinforcement.

The essence of the utility model is that a universal wellhead wellbore consists of a body, a pipe holder, a wellhead tee, as well as a gas outlet, flow line and an annulus with angle valves and a check valve, and the wellhead tee is elongated in the lower part. The fitting additionally contains a removable connection, on one end of which there is a union nut with an internal thread for the wellhead stuffing box tee, and on the other end there is a flange for fastening the valve, plug or lubricator. For descent of instruments during research

wells in the pipe holder at an angle made a wide-bore hole with a body installed in it with a blind cover. When operating an ESP well, this unit is also a cable sealing unit, and the lid is made with an opening for cable entry. A steel visor is used to ground and strengthen the reinforcement structure.

The design of the utility model is illustrated by drawings:

Figure 1 shows a universal wellhead well reinforcement;

figure 2 - removable connection;

in Fig.Z - cover cable entry.

Universal wellhead reinforcement (Fig. 1) consists of a housing 1, a pipe holder 2, a tee of a wellhead seal 3, a gas outlet 4 and a discharge 5 lines, an annulus 6 with angle valves (7.8.9, respectively), as well as a check valve 10, removable connection 11, at one end of which there is a union nut with an internal thread 12 for connection with a tee of the wellhead stuffing box 3, and at the other end there is a flange 13 for a valve, plug or lubricator (figure 2). For the descent of instruments during the study of wells in the pipe holder 2, a through-hole was made at an angle, in which, depending on the method of operation of the well, a body with a blind cover 14 is installed, and during the operation of the ESP well, a cable sealing unit with a cover with a hole is installed. To strengthen the structure and grounding, a steel visor 15 is welded to the body 1 and the nozzles of the annulus 5, 6.

Universal wellhead wellbore works in a lean manner.

The valve body 1 is used to connect it to the well casing coupling and has a gas outlet line 4 for venting gas from the annulus to the flow line 5 through the check valve 10. On the body 1 there is also a fitting with a screwed-in angle valve 9, designed to pump the process fluid into annulus and fluid level measurements in the well.

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A pipe holder 2 is attached to the flange of the housing 1, to which a tubing string (1ZHT) is suspended from the lower side. On the pipe holder 2, a wide-bore hole is provided for exploring the well with instruments. When the valve is operating in production mode or other technological processes, the wide-bore hole is jammed by plug 14. On the gas outlet line 4, after the corner valve, a check valve 10 is installed to vent excess gas pressure from the annulus into the flow line 5 and prevent overflow of produced products from 5 flow lines into the annulus when pressure is equalized in them. In addition to the design, the check valve 10 allows flushing the well with corrosion inhibitors or other process fluids in a closed cycle.

This reinforcement is designed for tying the wellhead equipped with a rod deep pump, ESP and allows you to adjust the operating mode of the well, its flushing and research. The design of the valve allows automatic bleeding of excess gas from the annulus to the flow line.

Sources of information:

1. Wellhead pumping equipment AZINMASH. - Oilfield business, JVb 6, 1954, p. 19.

2.A.S. USSR 635220 Е 21 В 33/03 “Armature of the mouth of oil and gas wells.

3. Wellhead fittings AU-140x50. Nasport and instruction manual 297-00-00 НС 386. Nrototype.

Claims (1)

A universal wellhead fitting consisting of a housing, a pipe holder, a wellhead tee, as well as a gas outlet, flow line and an annulus with angle valves and a check valve, characterized in that it is equipped with a removable connection, at one end of which there is a union nut with an internal thread for wellhead seal tee, and on the other end, a flange for attaching a valve, plug or lubricator, and the wellhead tee is elongated in the lower part, and a wide gap is made in the pipe holder at an angle one hole with a body with a blank cover installed in it, and if it is possible to operate an ESP well (electric centrifugal pump), this unit is a cable sealing unit, and the cover is made with a hole for cable entry, and a steel visor is installed for grounding and hardening the valve structure.