CN2256031Y - Low pressure lightweight top apparatus of gas well - Google Patents

Abstract

The utility model relates to a wellhead for producing gas (oil) in superficial layers in petroleum exploration and development, comprising an oil pipe head in which an oil pipe wedge plug is arranged, a gate valve, a flow regulating valve, a small four-way, a pressure gauge, etc. which are assembled by various flanges. The utility model has the advantages of compact structure, convenient transportation and installation, and high safety; the weight and the production cost of the wellhead is only the 20 to 35% and the 20 to 30% of a deep wellhead. The wellhead overcomes the abuses of large volume and inconvenient installation and transportation when a deep well wellhead is used as the wellhead of the gas production in the superficial layer, and poor safety when a simple wellhead is used. The utility model is especially suitable for a wellhead whose working pressure is 4 to 21MPa.

Description

Low pressure, light-duty gas wellhead equipment

The utility model belongs to a kind of shallow layer gas well is controlled fluid flow when gas production wellhead assembly that is mainly used in; The control head that also can be used as oil recovery, pressure acidifying and other underground work uses.

In recent years, China was in petroleum exploration and development, and the exploration and development utilization of shallow gas pay obtains paying attention to and development.But because the probing of shallow-layer well, the well site is narrow, and the device structure size is little, and is in light weight, thereby also just requires structure small volume and less weight, transportation, easy for installation to control head is corresponding.And China does not also have and the shallow gas well supporting wellhead assembly of operating pressure below 21MPa at present.Therefore, one be to adopt the high middle-deep well mouth device of pressure rating to replace in actual use; The 2nd, the fluid flow when adopting simple wellhead device control gas production.The former is because pressure rating is higher, volume is big, installation weight is generally at 1.5～2 tons, and therefore, not only transportation, installation and use etc. are all extremely inconvenient to be used for the shallow-layer well, and production and use cost are also higher; And the latter's tubing head usually adopts upper and lower flange, middle part to add weldering such as conduit to tie and form, and utilizes anchor ear to be connected with oil pipe.Though this type of device is simple in structure, exist security reliability poor, do not meet disadvantages such as safety in production requirement.

The purpose of this utility model be the design a kind of can with operating pressure at the matching used gas wellhead equipment of the following shallow-layer gas well of 21MPa, to reach the structure small volume and less weight, act on safe and reliable, transportation, easy for installation and reduce to produce effectively and purposes such as use cost.

Solution of the present utility model is still to adopt the pedestal of four-way tubing head as wellhead assembly.In the series connection of tubing head middle part 2 gate valves and a little four-way are set, the side of little four-way also is provided with 1～2 gate valve and the choke valve of a control fluid flow is set at the port of export of every gate valve; Another pressure meter then is located at the upper end of little four-way; The tubing head lower end of this wellhead assembly then is connected with gas well top layer conduit and supporting use by flange of the threaded end.Therefore, the utility model comprises tubing head and is located at oil pipe tapered plug, gate valve, choke valve, little four-way, pressure meter and the connector of inner chamber; Key is that this device is established 4～6 gate valves altogether, 1～2 choke valve and 2 pressure meters; Wherein respectively establish 1～2 gate valve at tubing head and little four-way side, and 2 gate valves of between serial connection; Pressure meter is connected to the end of little four-way and the gate valve output of the first side of oil pipe by stop valve respectively; Choke valve then is located at the gate valve output of little four-way side, also is provided with screw tap to hold out against tapered plug on the top of tubing head.All adopt flange seal to be connected between each gate valve and tubing head, little four-way, choke valve, stop valve and the gate valve.Above-mentioned gate valve both can adopt flat gate valve, also can adopt wedge valve.The oblique angle of oil pipe tapered plug and its awl seat fitting face is 30 °, and employing O type circle adds the stainless steel ring sealing or utilizes screw thread oil pipe directly to be hung on the bottom surface sealing of upper flange between two fitting faces.The above-mentioned choke valve that is used to control fluid flow is an Angle Throttle Valves.

The utility model is owing to the difference according to operating pressure, adopt gate valve, choke valve and the tubing head of varying number, little four-way etc. respectively and adopt standardized flange connector, seal organically to design, be combined into control head, its compact conformation, rationally, volume only is about 1/3rd of general middle-deep well well head, weight only be its 20～35%, cost of production only be its 20～30%, thereby has a small volume and less weight, characteristics such as safe in utilization, that reliability is high, transportation, easy for installation, and cost is low.Can be used as the gas production that operating pressure is 4～21MPa (oil) control head uses.

Accompanying drawing and description of drawings

Fig. 1, be the utility model structure and user mode figure;

Among the figure: 1, be tubing head (special four-way), 2, end flange, 3, tapered plug (tubing hanger), 4,10,11,12,17,22: gate valve, 5, tee junction.6, top layer conduit, 7,15: stop valve, 8,14: pressure meter.9, awl, 13,19: choke valve, 16, little four-way, 18: flange, 20: upper flange, 21, sealing ring, 23, end socket.

Embodiment

Present embodiment is an example with maximum working pressure (MWP) 14MPa gas wellhead equipment: whole device volume (high * wide * thick) 1630 * 1200 * 500mm, adopt 6 PF14/50 flat gate valves altogether; Latus rectum is 46mm; 13,19 is 6, and " * 16 Angle Throttle Valves, 2 pressure meters are Y100 * 25MPa.Each gate valve flange all adopts 6B～21/16 * 14, gasket ring R23; Screw number * diameter: 8 * Q20mm.All by SY5156 in the API standard～1～5 design, the specification of its medium and small four-way 16 is 200 * 200 * 50mm for all the other various big or small flanges, gasket ring, joint, little four-way.Tubing head 1, material are 35 cast steels, wherein vertical latus rectum

112mm, top internal diameter 140mm, middle part external diameter

210mm, upper flange 20: specification is

380 * 80, end flange: 380 * 90～5  "; Tapered plug (tubing hanger) 3:

" this tapered plug adopts 2 with the sealing of boring the seat fitting face, present embodiment to 170 * 2  for thickening, live load 63516kg/cm 167 * 7mmO type circle 21 reaches conical surface annular awl weldering one deck stainless steel layer under tapered plug; In order to the screw tap 9 that holds out against tapered plug 3, be four M27 * 2～175mm.This wellhead assembly assembles back intensity pressure testing 28MPa, and 3 minutes, it sealed close pressure-bearing leakproof before 50MPa phenomenon of sweating, and shell is done no abnormal for qualified during 70MPa.This wellhead assembly Applicable media: oil, natural gas, water; Only be the well head 1/3rd of CQ25/65 type middle-deep well about every cover gross weight 500kg, cost only be its 25%.

Embodiment two

On the basis of embodiment one, deduct gate valve 12 and 22, choke valve 13, and, promptly can be used as the wellhead assembly that maximum working pressure (MWP) is 4～7MPa with the port shutoff of end socket 23 with tubing head 1 and little four-way 16.Promptly at other technical data all under the condition with embodiment one, its cost and weight also can further reduce.

Claims (4)

1, a kind of low pressure, light-duty gas wellhead equipment comprise tubing head and are located at the oil pipe tapered plug of inner chamber, gate valve, choke valve, little four-way, pressure meter and connector; It is characterized in that this device establishes 4～6 gate valves, 1～2 choke valve and 2 pressure meters altogether; Wherein respectively establish 1～2 gate valve at tubing head and little four-way side, and 2 gate valves of between serial connection; Pressure meter is connected to the gate valve output of little four-way end and the first side of oil pipe respectively by stop valve; Choke valve then is located at the gate valve output of little four-way side; Also be provided with screw tap to hold out against tapered plug on the top of tubing head; All adopt flange seal to be connected between each gate valve and tubing head, little four-way, choke valve, stop valve and the gate valve.

2, by the described low pressure of claim 1, light-duty gas wellhead equipment, it is characterized in that described 4～6 gate valves both can be flat gate valve, also can be wedge valve.

3, by the described low pressure of claim 1, light-duty gas wellhead equipment, it is characterized in that described tubing head and be located at that the oblique angle of oil pipe tapered plug and its awl seat fitting face is 30 ° in the oil pipe tapered plug of inner chamber, and two cooperate between between adopt O type circle and stainless steel ring sealing or utilize screw thread oil pipe directly to be hung on the bottom surface sealing of upper flange.

4, by the described low pressure of claim 1, light-duty gas wellhead equipment, it is characterized in that described choke valve is an Angle Throttle Valves.

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