CN201428440Y - Minor-diameter downhole throttling device for gas well - Google Patents

Abstract

The utility model relates to a minor-diameter downhole throttling device for a gas well, which belongs to oilfield oil and gas production machinery and overcomes the defects existing in the prior art;a unique linkage mechanism for a friction mechanism, an anchoring mechanism, a sealing mechanism, a locking mechanism and a releasing mechanism is designed; therefore, the minor-diameter downhole throttling device for the gas well achieves the purposes of reliable setting, high sealing performance index, high temperature resistance and easy releasing and enables the gas production of the gas wellwith a 2'' oil tube to make great progress.

Description

Minor diameter natural gas well underground throttle device

One, technical field:

The utility model relates to a kind of oil field petroleum gas manufacturing machine, especially minor diameter natural gas well underground throttle device.

Two, background technology:

The oil exploitation natural gas well is produced the down-hole high pressure natural gas expenditure and pressure instrument that is used in the natural gas oil pipe the scaled high-pressure natural gas well of stratum output at present: have to be suitable for 2 ⁷/ ₈" oil pipe natural gas well underground throttle device and 3 " oil pipe natural gas well underground throttle device.And being suitable for 2 " developmental research of oil pipe natural gas well minor diameter restriction choke still is a blank, 2 " oil pipe minor diameter natural gas well minor diameter restriction choke owing to be subjected to oil pipe annular space (￠ 50.5mm) restriction, design is restricted.This just makes 2, and " well head easily formed hydrate and freezes when the oil pipe natural gas well was produced; Influence the natural gas well capacity." " oil pipe natural gas well minor diameter restriction choke has solved practical problem in the production, has huge social benefit and economic benefit for the problem that the production of the oil pipe natural gas well exists, research and development 2 according to scene, gas field 2." gas producing technology of the oil pipe natural gas well is obtained important breakthrough to make 2.

Three, summary of the invention:

The purpose of this utility model provides and a kind ofly is applicable to that the strata pressure of gas exploitation course mesohigh gas well is very high, well head pressure is also high when producing natural gas, " gas-bearing formation above minor diameter natural gas well underground throttle device in down-hole in the oil pipe; it has overcome the shortcoming that other technology exists, the purpose of this utility model is such realization to produce 2.Gas is chewed cap upper end box and is linked to each other with valve cover lower end pin thread; Gas is chewed with sealing ring combination edge and is put in the stomidium with valve; Valve set upper side box is connected with lower spindle lower end pin thread; Sealing ring is set in the upper end hole of valve cover; Attachment cap lower end pin thread is connected with the lower spindle lower end second road pin thread, and tightly the cap lower end is enclosed within on the extremely mouth of attachment cap, and the upper end box is connected with lock tube lower end pin thread; Lock ring is set in lock tube upper end pin thread and is equipped with in the inner chamber that the cap box is connected to form; Under protect the bowl be enclosed within on the bushing pipe; 1 soft gum tube and 2 ebonite tube combinations are enclosed within on the bushing pipe; On protect the bowl with carve body, 3 slips, slips holders are assembled into anchor mechanism, its lower end is enclosed within on the upper end elastic claw of bushing pipe; Design has step lock special seal circle to be set in to protect a bowl inner chamber on the bushing pipe; Centralizer body, 6 brake pads, 8 flat spring plates, helmets are assembled into the friction righting mechanism and are enclosed within deblocking and put, and the lower end pin thread of centralizer body is connected with the upper end box of slips holder; 2 shear pins are screwed in the shear pin screw thread of slips holder; Separate in the elastic claw that big envelope is set in bushing pipe, shear pin puts in to be separated in the groove of big envelope lower end; Last mandrel lower end box is connected with pin thread on the lower spindle, and the upper end fitted shaft is connected with a lower end of giving up; Cut off in the mating holes that is contained in mandrel and lower spindle; Give up head upper end is 5/8 sucker rod button.

Operating principle: restriction choke is connected on the instrument cab steel wire for logging, is contained in the blowout prevention box, be lowered to the design throttling degree of depth in the gas well oil pipe.Carry on the instrument cab winch is quick, centralizer body friction piece and anchoring system produce relative motion in promoting the mandrel system, and anchor mechanism is anchored on the tube inner wall, and secondly sealing mechanism seals the sky that changes of restriction choke and oil pipe generation; Locking mechanism locking anchor mechanism and sealing mechanism; Draw steel wire for logging in the continuation, the shear pin on the pull head is cut off, and realizes giving up, and the restriction choke seat is encapsulated in the design well depth, trips out steel wire for logging and weight linear meter, finishes the seat envelope process of gas well restriction choke.Underground throttle device valve throttling when gas well production drives a well, step-down, expansion process occur in the pit shaft, by down-hole valve throttling, reduce gas pressure in the pit shaft, destroy the formation condition of hydrate, reach the purpose that the control hydrate generates.Make gas flow rate surpass velocity of sound, improve the temperature of extraction natural gas, prevention well head gas hydrate forms.

During deblocking gas well restriction choke, on fishing socket connection and steel wire for logging, be loaded in the blowout prevention box, down in the gas well oil pipe, when fishing socket is transferred the degree of depth to restriction choke, fishing socket relies on deadweight that the deblocking of guide head guiding restriction choke is covered in the work together, continue pressurization, the deblocking of restriction choke covers into and drags in the pawl, and the barb that fishing socket drags for pawl is caught the barb of separating big envelope of restriction choke, on carry steel wire for logging 150-250Kg, the deblocking shear pin is cut off, and the screen resilience of hermetically-sealed construction makes the packing element resilience, and anchor mechanism loses support force, the anchoring structure deblocking is finished the restriction choke deblocking and is tripped out minor diameter natural gas gas well restriction choke.

The problem that exists at the job execution process of oil exploitation natural gas well oil pipe expenditure and pressure throttling technology and the state of the art of dealing with problems at present; The utility model can guarantee to realize the minor diameter restriction choke of oil exploitation natural gas well oil pipe expenditure and pressure technology, and the realization seat secures and leans on, and withstand voltage difference is high, and deblocking is reliable.Formation condition by gas pressure and destruction hydrate in down-hole valve throttling, the reduction pit shaft reaches the purpose that prevents that hydrate from generating, and improves the temperature of extraction natural gas.2 " unique friction mechanism, anchor mechanism, the sealing mechanism of oil pipe minor diameter natural gas well underground throttle device design, separate the linkage of seal structure, locking mechanism is realized step lock.In the time of can being implemented in following of the effect envelope of friction mechanism, grappling, sealing are carried out synchronously, genlocing, and cutting off under impact loading at last gives up cuts off and finishes the seat envelope.Can realize during deblocking dragging for and separate big envelope and break the deblocking shear pin, under the effect of screen resilience, sealing mechanism, anchor mechanism be deblocking simultaneously, can trip out the down-hole smoothly under packing element.

Important technological parameters: 1, restriction choke heatproof: 130 ℃; 2, maximum outer through Φ 45mm3, maximum length 660mm; 4, withstand voltage poor: 30MPa; 5, seat envelope load 300Kg; 6, deblocking load 100-150Kg; 7, depth of setting＜=3000m; 8, be suitable for oil pipe 2 " TBG.

Four, description of drawings:

Fig. 1 is the structural representation of minor diameter natural gas well underground throttle device, among the figure 1, gas is chewed cap 2, sealing ring 3, gas chews 4, valve cover 5, sealing ring 6, attachment cap 7, and tight cap 8, lock tube 9, lock ring 10, under protect the bowl 11, soft gum tube 12, ebonite tube 13, on protect the bowl 14, sealing ring 15, carve body 16, slips 17, slips holder 18, shear pin 19, bushing pipe 20, lower spindle 21, centralizer body 22, brake pad 23, latch plate 24, helmet 25, separate big envelope 26, last mandrel 27, cut off 28, give up 29, be equipped with cap.

Five, the specific embodiment:

Gas is chewed cap 1 upper end box and is overlapped 4 lower end pin threads with valve and link to each other; Gas is chewed 3 and is overlapped in 4 upper end holes with valve with sealing ring 2 combination edge; Valve overlaps 4 upper end boxes and is connected with lower spindle 20 lower end pin threads; Sealing ring 5 is set in the upper end hole of valve cover 4; Attachment cap 6 lower end pin threads are connected with the lower spindle 20 lower ends second road pin thread, and tightly cap 7 lower ends are enclosed within on the extremely mouth of attachment cap 6, and the upper end box is connected with lock tube 8 lower end pin threads; Lock ring 9 is set in lock tube 8 upper end pin threads and is equipped with in the inner chamber that cap 29 boxes are connected to form; Under protect bowl and 10 be enclosed within on the bushing pipe 19; 1 soft gum tube 11 and 2 ebonite tube 12 combinations are enclosed within on the bushing pipe 19; On protect bowl 13 and carve body 15,3 slips 16, slips holders 17 and be assembled into anchor mechanism, its lower end is enclosed within on the upper end elastic claw of bushing pipe 19; Design has the special button of step lock on the bushing pipe 19; Sealing ring 14 is set in and protects bowl 13 inner chambers; Centralizer body 21,6 brake pad 22,8 flat spring plates 23, helmets 24 are assembled into the friction righting mechanism and are enclosed within and separate on the big envelope 25, and the lower end pin thread of centralizer body 21 is connected with the upper end box of slips holder 17; 2 shear pins 18 are screwed in the shear pin screw thread of slips holder 17; Separate in the elastic claw that big envelope 25 is set in bushing pipe 19, shear pin 18 puts in to be separated in 25 times end slots of big envelope; Last mandrel 26 lower end boxes are connected with pin thread on the lower spindle 20, and the upper end fitted shaft is connected with 28 lower end of giving up; Cutting off 27 is contained in the mating holes of mandrel 26 and lower spindle 20; 28 upper end of giving up are 5/8 sucker rod buttons.

Claims (4)

1, minor diameter natural gas well underground throttle device, it is to chew cap (1) by gas, sealing ring (2), gas is chewed (3), valve cover (4), sealing ring (5), attachment cap (6), and tight cap (7), lock tube (8), lock ring (9), under protect the bowl (10), soft gum tube (11), ebonite tube (12), on protect the bowl (13), sealing ring (14), carve body (15), slips (16), slips holder (17), shear pin (18), bushing pipe (19), lower spindle (20), centralizer body (21), brake pad (22), latch plate (23), helmet (24), separate big envelope (25), last mandrel (26), cut off (27), give up (28) and be equipped with cap (29) and be formed by connecting, it is characterized in that: gas is chewed cap (1) upper end box and is linked to each other with valve cover (4) lower end pin thread, and gas is chewed (3) and made up in edge and valve cover (4) upper end hole with sealing ring (2); Valve cover (4) upper end box is connected with lower spindle (20) lower end pin thread, and sealing ring (5) is set in the upper end hole of valve cover (4); Attachment cap (6) lower end pin thread is connected with lower spindle (20) the lower end second road pin thread, and tightly cap (7) lower end is enclosed within on the extremely mouth of attachment cap (6), and the upper end box is connected with lock tube (8) lower end pin thread; Lock ring (9) is set in lock tube (8) upper end pin thread and is equipped with in the inner chamber that cap (29) box is connected to form; Under protect bowl (10) and be enclosed within on the bushing pipe (19), the combination of 1 soft gum tube (11) and 2 ebonite tubes (12) is enclosed within on the bushing pipe (19); Sealing ring (14) is set in and protects bowl (13) inner chamber; Two shear pins (18) are screwed in the shear pin screw thread of slips holder (17); Separate big envelope (25) and be set in the elastic claw of bushing pipe (19), shear pin (18) puts in to be separated under the big envelope (25) in the end slot; Last mandrel (26) lower end box is gone up pin thread with lower spindle (20) and is connected, and the upper end fitted shaft is connected with head (28) lower end of giving up, and cuts off (27) and is contained in the mating holes of mandrel (26) and lower spindle (20); Give up the head (28) upper end be 5/8 sucker rod button.

2, minor diameter natural gas well underground throttle device according to claim 1 is characterized in that: on protect bowl (13), carve body (15), 3 slips (16) and slips holder (17) and be assembled into anchor mechanism, its lower end is enclosed within on the upper end elastic claw of bushing pipe (19); Bushing pipe (19) is gone up design the special button of step lock.

3, minor diameter natural gas well underground throttle device according to claim 1, it is characterized in that: centralizer body (21), brake pad (22), latch plate (23) and helmet (24) are assembled into the friction righting mechanism and are enclosed within and separate on the big envelope (25), and the lower end pin thread of centralizer body (21) is connected with the upper end box of slips holder (17).

4, minor diameter natural gas well underground throttle device according to claim 1, it is characterized in that: brake pad (22) has 6, and latch plate (23) has 8.

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