CN2526502Y

CN2526502Y - Layered constant steam distributing valve for thickened oil heat recovery well

Info

Publication number: CN2526502Y
Application number: CN 02209779
Authority: CN
Inventors: 陈人忠; 代英伟
Original assignee: WEIGAO SCIENCE AND TECHNOLOGY Co Ltd PANJIN CITY
Current assignee: WEIGAO SCIENCE AND TECHNOLOGY Co Ltd PANJIN CITY
Priority date: 2002-01-15
Filing date: 2002-01-15
Publication date: 2002-12-18
Anticipated expiration: 2012-01-15

Abstract

The utility model relates to a viscous oil thermal production well sub-layer constant gas distribution valve used for injection steam heat exploitation, consisting of an upper joint 1, a central pipe 2, a flux control ring 3, a valve core 4, an external pipe 5, a spring 6 and a pressing cap 7. The utility model has the advantages of reasonable design, simple structure, reliable work, and strong automatic anti-jamming; the utility model can be adopted to automatically adjust and control gas injection flux under the condition that an object layer sucking pressure is changed and to ensure the viscous oil thermal production well to implement sub-layer constant gas distribution, thus being beneficial to solving the contradiction between layers, improving the viscous oil exploitation effect and being suitable for promotion and application.

Description

Thick oil thermal extraction layering constant steam distributing valve

The utility model relates to a kind of downhole hardware that is used for thick oil filling steam heating exploitation.

Steam injection oil recovery by heating technology is the main method in heavy crude producing oil field.At present, the viscous crude field thick oil thermal extraction is when steam in jection, and the main path that solves interlayer contradiction is that some target zone is annotated in choosing on the basis of heating power packer, or adopts the method for pitching to select the layer of annotating some purpose.In addition, also have on basis, on steam injection string, stamp metering hole and utilize metering hole to carry out flow-control target zone vapor absorption capacity estimation.More than these measures for annotate inhale between the vapour target zone the less well effect of vapour difference still can, but then can only improve by a small margin, and can not fundamentally solve significantly for the well that the interlayer vapor absorption capacity differs greatly.In addition, the chemical profile control method effect of field by using is also not satisfactory, under the condition of the certain water vapour mass dryness fraction in down-hole, to target zone because of the variation restraint of inhaling steam pressure and changing the suction steam flow amount that causes a little less than, it is not good enough to adjust effect.

The purpose of this utility model is to provide a kind of can regulate oil reservoir steam in jection flow automatically in the steam injection thermal recovery well, thereby realizes solving the interlayer contradiction of annotating the vapour target zone, the thick oil thermal extraction layering constant steam injection valve that improves the thickened oil recovery effect.

The utility model is to realize like this.This kind layering constant gas filling device is made up of top connection, central tube, flow-control ring, spool, outer tube, spring and pressure cap, its structure, assembled relation are as follows: top connection lower end periphery is connected with central tube with outer tube with screw thread respectively with inner headed face, the central tube outside is provided with spool, be provided with flow-control ring and spring in the space between central tube and the spool, wherein flow-control ring upper outside step is sat and is placed on the spool end face, the bottom is connected with the spool inner headed face with screw thread, and outer tube lower end inner headed face screw thread has been tightened pressure cap.During use, this steam distributing valve is assembled on the thick oil thermal extraction laminated distributor under well constant steam distributing pipe post down to the down-hole predetermined position.During work, the steam in the insulated tubing to flow-control ring upper end, flows to the lower end of flow-control ring and spool through the orifice flow in the top connection then through the annular space between flow-control and the central tube, and the side opening road by the outer tube bottom flows to oil reservoir again.Flow-control ring and spool link together, and can do to slide up and down in outer tube, also just produce the relative displacement campaign between flow-control ring and the central tube simultaneously.The endoporus of flow-control ring is the up-small and down-big infundibulate of falling, when the flow-control ring is in the top dead-centre of stroke, the boss that a slyness is arranged on the central tube external diameter corresponding to position, flow-control ring endoporus maximum diameter of hole, and form an annular flow channels that is used to control flow, the cross-sectional area maximum of flow channels when this position between the flow-control ring endoporus; When under the flow-control hoop when mobile, the cross-sectional area of flow channels reduces by a certain rule, the cross-sectional area minimum of flow channels when the position of bottom dead centre.This steam distributing valve at its upstream or disturbances cause that to realize under the situation that steam flow changes that auto-control, constant are joined the mechanism of vapour as follows: before vapor stream inflow-rate of water turbine gate ring, flow-control ring and spool are in the top dead-centre of stroke under the effect of spring, spring has certain pretightning force.When the steam flow by designing requirement flows through the flow-control ring, before and after flow-control ring and spool, produce a chock pressure difference, this chock pressure difference acts on flow-control ring internal diameter and the formed annular cross-sectional area of spool external diameter and to produce a downward thrust, promotes flow-control ring and spool and moves downward together and compress spring.When flow-control ring and spool went downwards to the mid point of stroke, the thrust that chock pressure difference produces equated just with the reaction force of spring generation, makes whole system be in the state of a balance.When steam distributing valve upstream or disturbances caused that steam flow increases, flow-control ring two ends pressure reduction increased, and the thrust that chock pressure difference produces increases, and it is descending together to promote gate ring and spool, make the flow channels sectional area reduce, thereby steam flow reduces; Otherwise when steam distributing valve upstream or disturbances caused that steam flow reduces, flow-control ring two ends pressure reduction reduced, and the thrust that chock pressure difference produces reduces, and gate ring and spool are up together, and the flow channels sectional area increases, thereby steam flow is increased.So,, make thick oil thermal extraction to inhale under the situation that steam pressure changes and keep layering constant steam in jection, obtain good exploitation effect by design scheme at down-hole steam injection pressure and target zone by the above-mentioned work of this steam distributing valve.

The utility model is reasonable in design, simple in structure, reliable operation, Automatic Anti-interference is strong, utilize it can regulate each target zone notes steam flow amount of controlling automatically under the situation of steam injection pressure, the variation of target zone suction steam pressure, assurance viscous crude heat is annotated well realization layering constant and is joined vapour, thereby helps solving interlayer contradiction, improve the thickened oil recovery effect, be suitable for and apply.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the another kind of constructional variant of this steam distributing valve.

Fig. 3 is the down-hole steam distributing pipe post package assembly schematic diagram that is lowered in the thermal production well.Among the figure, label " 9 " is a sleeve pipe, and " 10 " are instlated tubular, and " 11 " are expansion loop, and " 12 " are the heating power packer, and " 13 " are the constant steam distributing valve, and " 14 " are plug.

Below in conjunction with accompanying drawing enforcement of the present utility model is illustrated.

As shown in the figure, the utility model is made up of top connection 1, central tube 2, flow-control ring 3, spool 4, outer tube 5, spring 6 and pressure cap 7.Wherein, top connection 1 inner headed face upper end band insulated tubing box, the lower end band is connected with central tube uses negative thread, and the middle part is to have longitudinal hole, periphery lower end band pin thread.Central tube 2 upper and lower ends are with pin thread respectively, and the top periphery is provided with the boss with flow-control ring 3 cooperatings.Flow-control ring 3 is the annulus that periphery upper end is provided with step, and step is following threaded, and its inner headed face upper/lower terminal is a taper seat.Spool 4 is the pipe that the threaded and below of a upper end inner headed face is provided with a little step.Outer tube 5 upper and lower ends are with negative thread respectively, and its underpart is uniformly distributed with 6-8 side direction through hole along the circumference.The another kind of constructional variant shown in Figure 2 and the difference of structure shown in Figure 1 are to have increased a valve seat above pressure cap, and the structure to spool 4, flow-control ring 3 and outer tube 5 changes a little in addition.

Claims

1, a kind of thick oil thermal extraction layering constant steam distributing valve, by top connection (1), central tube (2), flow-control ring (3), spool (4), outer tube (5), spring (6), pressure cap (7) is formed, it is characterized in that, top connection (1) lower end periphery is connected with central tube (2) with outer tube (5) with screw thread respectively with inner headed face, central tube (6) outside is provided with spool (4), be provided with flow-control ring (3) and spring (6) in the space between central tube (2) and the spool (4), flow-control ring (3) upper outside step is sat and is placed on spool (4) end face, the bottom is connected with spool (4) inner headed face with screw thread, and outer tube (5) lower end inner headed face screw thread has been tightened pressure cap (7).