CN2427627Y

CN2427627Y - Concentric injection and oil collection means

Info

Publication number: CN2427627Y
Application number: CN 00208835
Authority: CN
Inventors: 杨景纯; 袁涛; 李天德; 薛家锋
Original assignee: No4 Oil Prodn Plant Of Daqing Petroleum Field Co Ltd
Current assignee: No4 Oil Prodn Plant Of Daqing Petroleum Field Co Ltd
Priority date: 2000-04-30
Filing date: 2000-04-30
Publication date: 2001-04-25
Anticipated expiration: 2010-04-30

Abstract

The utility model relates to a concentric injection and collection device matched with stratified injection under an oil well for a tertiary oil extraction well in an oil field. The utility model overcomes the problem of an eccentric water distributor. The concentric injection and collection device has a large diameter, and a guiding angle of a liquid outlet is in the shape of a circular arc. An upper and a lower piston (9, 13) and a piston sleeve are sheathed on a central tube, and the lower piston is sheathed with a sliding annular chamber 14. The upper piston is sheathed with a sliding sleeve 17, a spring 4 and a forcing screw nut 3. The screw nut is screwed to press a matching element under the screw nut, and the sliding sleeve is provided with a guiding slot 5 and a flow channel 16. The concentric injection and collection device having balanced stress on a matched post can meet the need of an oil displacing channel for injecting polymers and can to prevent the loss of the degradation and the viscosity of liquid.

Description

Annotate poly-device with one heart

The utility model relates to tertiary oil production in oil field polymer injection displacement of reservoir oil well laminated distributor under well and injects the poly-device of supporting concentric notes.

The oil field enters the displacement of reservoir oil of tertiary oil recovery polymer injection, because the polymeric liquid that polymer displacement of reservoir oil injects has the characteristic of degraded under mechanical shearing, viscosity reduction, therefore, the individual well layering injection technology technology of at present domestic and international polymer displacement of reservoir oil is to adopt two-tube double-deck method for implanting.Inject the single pipe layered technology of well for the polymer displacement of reservoir oil of developing, eccentric injection mandrel in the existing water drive layering injection technology can't be used, the subject matter of its existence: the one, when polymer solution passes through the water nozzle of eccentric injection mandrel, the channel diameter of water nozzle and serious to the mechanical shearing degraded that polymer solution produces along the streamlined shape of journey, make polymer solution pass through water nozzle after viscosity loss big; The 2nd, latus rectum is little in the existing eccentric injection mandrel central tube, be subjected under the constant situation of casing inner diameter restriction at its external diameter, enlarge the size restrictions that the interior latus rectum of eccentric injection mandrel central tube is subjected to eccentric position, its central tube internal channel diameter can not satisfy the needs that pass through that polymer displacement of reservoir oil injects the single pipe layered technology downhole flow of well controller; The 3rd, eccentric injection mandrel discharges at downhole packer needs to throw earlier a dead mouthpiece when setting, and treats to pull dead mouthpiece out after downhole packer release sets, and then throws a dead mouthpiece and could realize normal the injection.

The purpose of this utility model is to avoid the weak point that exists in the above-mentioned present technology, satisfies oil field polymer injection displacement of reservoir oil well laminated distributor under well and injects the poly-device of supporting concentric notes and provide a kind of.

The purpose of this utility model can reach by the following technical programs: the central tube that between upper and lower joint, is threaded with upper and lower connection, and it is the circular arc fluid hole that the lead angle of symmetry is arranged on this central tube, and connects piston bush outside in lower contact; In the ring cavity between lower contact and the piston bush in overlap on the above-mentioned fluid hole upper piston, under overlap lower piston, under lower piston, form residue ring cavity section; On central tube, be with sliding sleeve on the upper piston, the axial location groove and the runner of symmetry arranged on this sliding sleeve, wherein supporting stressed spring and application of force nut on the sliding sleeve.

In such scheme, fluid hole is positioned under the upper surface of lower piston on the central tube, and between form annular flow path, this annotates poly-device with one heart by above forecast scheme configuration.The inner diameter of centerpipe passage of annotating poly-device can satisfy the needs that polymer displacement of reservoir oil injects the single pipe layered downhole flow controller of well, fluid hole and residue ring cavity section design in conjunction with fluid and theory of mechanics on the central tube, resistance is little, the loss of fluid viscosity and the loss of degraded can be reduced, purpose of design can be realized.

The utility model has following advantage than above-mentioned prior art: the viscosity degradation rate to polymer solution is low, and downhole flow regulator is passed through smoothly, has satisfied the requirement that polymer displacement of reservoir oil injects well single tube zonal injection technology technology.

Accompanying drawing 1 is a half sectional view of the present utility model;

Accompanying drawing 2 is front views of Fig. 1 upper sliding sleeve 5;

Accompanying drawing 3 is A-A sectional views on Fig. 2;

Accompanying drawing 4 is left views of Fig. 2.

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 1, the central tube 2 that is threaded between the top connection 1 that connects with the injection allocation tubing string, the lower contact 15, it is circular arc fluid hole 10 that the lead angle of symmetry is arranged on central tube 2, and connection piston bush 7 in lower contact 15 outside.In the ring cavity between lower contact 15 and the piston bush 7 in cover upper piston 9 on the hole 10, under cover lower piston 13, under lower piston 13, form residue ring cavity section 14.On central tube 2, be with sliding sleeve 17 on the upper piston 9, the axial location groove 5 and the runner 16 of symmetry arranged on this sliding sleeve 17, supporting stressed spring 4 and application of force nut 3 on the sliding sleeve 17.

In above-mentioned scheme, fluid hole 10 is positioned under the upper surface of lower piston 13 on the central tube 2, forms annular flow path between the two.Joint ring 8 is equipped with in sliding sleeve 17 usefulness bearing pins 6 location on the upper piston 9, the pin 12 that symmetry is arranged on joint ring 11 and the wall is housed on the lower piston 13.

At the problems referred to above that existing eccentric injection mandrel exists, inject the single pipe layered injection technology requirement in well down-hole in order to satisfy polymer displacement of reservoir oil, we have designed the poly-device of concentric notes, have solved on-the-spot practical problem.The utility model injects demixing technology at polymer displacement of reservoir oil, used the relevant principle of fluid with Machine Design, the major technique content: the one, change liquid flow path into concentric ring row of channels 14 to reduce polymer solution by eccentric water nozzle at the mechanical degradation of passage along journey, fluid hole on the central tube 2 10 is designed to the viscosity loss at place, streamlined reduction aperture, design aneroid and hindered directed sliding sleeve 5, make the sliding sleeve back that puts in place not produce resistance, avoided spring 4 liquid to be produced resistance and viscosity degraded loss takes place at fluid hole 10 places to the liquid that flows out from fluid hole 10; The 2nd, annotate poly-device external diameter with one heart and be subjected under the constant situation of casing inner diameter restriction, with its central tube 2 internal channel enlarged-diameter, make it to satisfy the needs that pass through that polymer displacement of reservoir oil injects the single pipe layered technology downhole flow of well controller, also satisfy the requirement of concentric ring row of channels 14; The 3rd, annotate poly-device with one heart after packer release sets, can directly inject without pulling, its principle is, annotate with one heart when poly-device is gone into the well and be in oil jacket not together with state, packer discharges when setting, the pipe internal pressure acts on the lower piston 13 and makes it descending, pressure also acts on the upper piston 9 and makes it motionless simultaneously, guarantee concentric ring row of channels 14 not with external communications, when treating to remove pressure after downhole packer release sets, act on the pressure disappearance on the upper piston 9, upper piston 9 moves downward under the force action of self gravitation and spring 4 after losing and supporting, and makes fluid hole 10 and external communications realization injection on the central tube 2.

Claims

1, a kind of poly-device of the supporting concentric notes of oil well lower leaf injection that relates to has top connection (1) and lower contact (15), it is characterized in that:

A. the central tube (2) that between top connection (1) and lower contact (15), is threaded, it is circular arc fluid hole (10) that the lead angle of symmetry is arranged on central tube (2), and goes up outer connection piston bush (7) in lower contact (15);

B. in the ring cavity between lower contact (15) and the piston bush (7) in overlap on hole (10) upper piston (9), under overlap lower piston (13), under lower piston (13), form residue ring cavity section (14);

C. on central tube (2), be with sliding sleeve (17) on the upper piston (9), the axial location groove (5) and the runner (16) of symmetry arranged on the sliding sleeve (17), supporting stressed spring (4) and application of force nut (3) on the sliding sleeve (17).

2, according to the poly-device of claims 1 described concentric notes, it is characterized in that: central tube (2) is gone up fluid hole (10) and is positioned under the upper surface of lower piston (13), and between form annular flow path.