CN101139918A - Layered water blocking device for oil exploitation well - Google Patents

Abstract

A water layer block device for petroleum exploitation well is provided, which relates to the technical field of downhole petroleum exploitation. The invention aims at solving the problem of prior straight push rod type water block devices of no fulfilling self-latching function, so as to cause that the straight push rod can be automatically pushed away, as well as the problem that large quantity of sand and mud in formations might extremely block floaters, so that the floaters can be raised automatically because of differences of water and oil density. The invention is provided with a pipeline (1-1) communicated through vertically inside a shell (1); a motor and a leadscrew nut mechanism (3) are arranged in a lower chamber cavity (1-5) inside the shell (1); a check valve (4) and a concave-shaped spring washer (5) are arranged in an upper chamber (1-4) inside the shell (1); a rotary shaft inside a motor (2) is connected with the leadscrew nut mechanism (3); a straight movement end of the leadscrew nut mechanism (3) is provided with a bulk-head ball (4-2) in the check valve (4). The valve of the invention can be sufficiently shut and contacted to reach the target of completely block water circuits, and under opening or closing status, the valve can be latched in existing status automatically. The invention adapts to all kinds of environments where pressure difference between formations and oil pipes is lower than 8MPa.

Description

The separate zone water shutoff device that the oil exploitation well is used

Technical field

What the present invention relates to is the technical field of oil underground mining water blockoff.

Background technology

The oil-field flooding displacement of reservoir oil exploitation middle and later periods, the main product oil reservoir is high moisture trend mostly.In order to increase output, improve recovery ratio, to realize water and oil control, progressively promoted measures such as layering card water blockoff and oil production by layer, and effective water clogging tool becomes wherein a great problem and bottleneck.In existing water-plugging technique, in patent publication No. is CN101012737A, a kind of water detection under production status is disclosed in the patent of " producing well derailing switch under production status is asked product; water detection and shutoff method " that open day is on August 8th, 2007, ask and produce and shutoff method, its core frame for movement adopts is straight push rod form but does not have self-locking mechanism, therefore, be difficult to satisfy the needs of the motive force of big pressure reduction between oil reservoir and the oil pipe, if derailing switch is under the state that builds the pressure for a long time, inside and outside differential pressure is huge, the problem that easily causes straight push rod to be pushed open automatically, so that can't reach the purpose of water blockoff.In patent publication No. is CN1385594A, open day be disclose in the patent of " intelligent water blocking valve used under well " on December 18th, 2002 a kind of by float methods because of the different automatic water blockoffs of buoyancy in water and oil, its weak point is to exist a large amount of silt very likely that float is stuck and can be because of the different rise and fall automatically of water, oil density in the oil reservoir, in addition, problems such as existence interpenetrates between layer and the layer can't realize separate zone production.Therefore, though this structure is simple, reliability is relatively poor, and is high to the oil reservoir environmental requirement, and practicality is not strong.

Summary of the invention

The present invention can not realize self-locking in order to overcome existing straight push rod form water blocking device, be difficult to satisfy the needs of the motive force of big pressure reduction between oil reservoir and the oil pipe, and the problem that easily causes straight push rod to be pushed open automatically, and because of exist in the oil reservoir a large amount of silt very likely with float is stuck can be because of the different rise and fall automatically of water, oil density, in addition, there is interpenetrative problem between layer and the layer, and has the problem that can't realize separate zone production.And then the separate zone water shutoff device that a kind of oil exploitation well is used proposed.

The present invention is made up of housing 1, motor 2, screw-nut body 3, one way valve 4, spill elastic washer sheet 5; Be provided with the pipeline 1-1 of up/down perforation in the housing 1, pipeline 1-1 upper end is provided with interface 1-2, the lower end of pipeline 1-1 is provided with lower interface 1-3, is provided with upper plenum 1-4 and following cavity 1-5 in the sidewall of housing 1, and upper plenum 1-4 is communicated with following cavity 1-5 by circular hole 1-7; Have through hole 1-6 between the periphery of the upper top of cavity 1-4 and housing 1, one way valve 4 is made up of pushing rod sleeve 4-1, water blockoff ball 4-2; Being provided with in one week of disc and the identical boss 4-3 of water blockoff ball 4-2 curvature in the middle part of in the pushing rod sleeve 4-1, water blockoff ball 4-2 is slidingly connected at pushing rod sleeve 4-1 inside; The inner round wall face on the upper plenum 1-4 top of the cylindrical wall of one way valve 4 and housing 1 is slidingly connected, the port surface of the inlet end face on one way valve 4 tops by spill elastic washer sheet 5 and upper plenum 1-4 top through hole 1-6 be apical grafting mutually, have through hole 1-8 between the inwall of the upper plenum 1-4 of housing 1 and housing 1 inner headed face, through hole 1-8 position is arranged on the outlet 4-4 place of one way valve 4; Screw-nut body 3 is made up of leading screw 3-1, square toes sleeve nut 3-2; The male end of leading screw 3-1 is threaded with the female end of square toes sleeve nut 3-2; Screw-nut body 3 is arranged in the top square hole of following cavity 1-5 of housing 1 and with housing 1 and is slidingly matched, motor 2 is arranged in the bottom of following cavity 1-5 of housing 1, the round bar end of square toes sleeve nut 3-2 in the screw-nut body 3 slides and passes behind the circular hole 1-7 in the housing 1 on the water blockoff ball 4-2 among the pushing rod sleeve 4-1 of apical grafting in one way valve 4, and the rotating shaft end of the leading screw 3-1 in the screw-nut body 3 is connected with the rotating shaft of motor 2 is coaxial.

Valve among the present invention close full contact, can reach the purpose of complete water blockoff, and can when opening or closing state, self-locking keep current state, it is applicable to that pressure reduction between oil reservoir and oil pipe is lower than the various environment of 8MPa.And has cheap a, advantage of simple structure.Because of spill elastic washer sheet has rebound effect, make that valve full contact when closing is tight.

Description of drawings

Fig. 1 is the overall structure schematic diagram during valve closing among the present invention, and Fig. 2 is an a place structure for amplifying schematic diagram among Fig. 1, and Fig. 3 is the overall structure schematic diagram during valve open among the present invention, and Fig. 4 is the structural representation of the present invention when concrete the application.

The specific embodiment

The specific embodiment one: in conjunction with Fig. 1, Fig. 2, Fig. 3 present embodiment is described, present embodiment is made up of housing 1, motor 2, screw-nut body 3, one way valve 4, spill elastic washer sheet 5;

Be provided with the pipeline 1-1 of up/down perforation in the housing 1, pipeline 1-1 upper end is provided with interface 1-2, the lower end of pipeline 1-1 is provided with lower interface 1-3, is provided with upper plenum 1-4 and following cavity 1-5 in the sidewall of housing 1, and upper plenum 1-4 is communicated with following cavity 1-5 by circular hole 1-7; Have through hole 1-6 between the periphery of the upper top of cavity 1-4 and housing 1, one way valve 4 is made up of pushing rod sleeve 4-1, water blockoff ball 4-2; Being provided with in one week of disc and the identical boss 4-3 of water blockoff ball 4-2 curvature in the middle part of in the pushing rod sleeve 4-1, water blockoff ball 4-2 is slidingly connected at pushing rod sleeve 4-1 inside; The inner round wall face on the upper plenum 1-4 top of the cylindrical wall of one way valve 4 and housing 1 is slidingly connected, the port surface of the inlet end face on one way valve 4 tops by spill elastic washer sheet 5 and upper plenum 1-4 top through hole 1-6 be apical grafting mutually, have through hole 1-8 between the inwall of the upper plenum 1-4 of housing 1 and housing 1 inner headed face, through hole 1-8 position is arranged on the outlet 4-4 place of one way valve 4; Screw-nut body 3 is made up of leading screw 3-1, square toes sleeve nut 3-2; The male end of leading screw 3-1 is threaded with the female end of square toes sleeve nut 3-2; Screw-nut body 3 is arranged in the top square hole of following cavity 1-5 of housing 1 and with housing 1 and is slidingly matched, motor 2 is arranged in the bottom of following cavity 1-5 of housing 1, the round bar end of square toes sleeve nut 3-2 in the screw-nut body 3 slides and passes behind the circular hole 1-7 in the housing 1 on the water blockoff ball 4-2 among the pushing rod sleeve 4-1 of apical grafting in one way valve 4, and the rotating shaft end of the leading screw 3-1 in the screw-nut body 3 is connected with the rotating shaft of motor 2 is coaxial.The sidewall of housing 1 is provided with the threading pipeline 6 of up/down perforation.

Operating principle: in conjunction with Fig. 4 explanation, during production, quantity according to oil reservoir, earlier with oil pipe A with down-hole water blockoff device C, communication cable D, the packer E of back-off sub B and some be cascaded (as Fig. 1), be lowered in the oil well that needs water detection, water blockoff, wherein down-hole water blockoff device C is identical with the number of plies that this oil well is divided with the quantity of packer E, and is placed on the perforated interval of each layer, and packer C places the two ends of the perforated interval of each layer.Ground is suppressed with the high pressure pump truck and packer E is set and after pitching breaks away from the above oil pipe of back-off sub B with it, oil pumper F is connected down to corresponding position with oil pipe A again then.

Its concrete course of work is: ground controller G sends the command signal of switch valve, this signal passes among the water blockoff device C by cable, Drive and Control Circuit drive motor 2 rotation works among the water blockoff device C, drive the leading screw 3-1 rotation in the screw-nut body 3, and rotatablely moving of motor 2 is converted to rectilinear motion, the water blockoff ball 4-1 apical grafting that square toes sleeve nut 3-2 promotes in the one way valve 4 flattens on pushing rod sleeve 4-1 internal boss 4-3 and with spill elastic washer sheet 5, valve closing, make dc motor 2 that stall take place, operating current increases rapidly, when locked rotor current reaches preset value, to stop power supply, valve closing signal feeds back to rapidly among the aboveground ground controller G, on the contrary when valve open, motor 2 counter-rotatings, square toes sleeve nut 3-2, water blockoff ball 4-1 return, spill elastic washer sheet 5 shape that resiles, stall can take place in motor 2 equally when valve was opened fully, and stopped power supply, aboveground ground controller G also can receive this information, and can realize the monitoring of very-long-range.Described controller G, current sensing means get final product with the prior art means.

The mode that the sealing means of down-hole water blockoff device C takes movable sealing to combine with static seal, housing 1 can resolve into three sections, then by central tube with three sections serial connections, install to make things convenient for inner body, every section binding site adopts static seal to realize, screw-nut body 3 sections of moving reciprocatingly adopt movable sealing to realize, enter with grease proofing, water etc. and pollute in motor 2 and other circuit part.

Claims (2)

1. the separate zone water shutoff device used of oil exploitation well, it is made up of housing (1), motor (2), screw-nut body (3), one way valve (4), spill elastic washer sheet (5);

It is characterized in that being provided with in the housing (1) pipeline (1-1) of up/down perforation, pipeline (1-1) upper end is provided with interface (1-2), the lower end of pipeline (1-1) is provided with lower interface (1-3), be provided with upper plenum (1-4) and following cavity (1-5) in one sidewall of housing (1), upper plenum (1-4) is communicated with following cavity (1-5) by circular hole (1-7); Have through hole (1-6) between the periphery of the upper top of cavity (1-4) and housing (1), one way valve (4) is made up of pushing rod sleeve (4-1), water blockoff ball (4-2); In the pushing rod sleeve (4-1) middle part be provided with the boss (4-3) identical in one week of disc with water blockoff ball (4-2) curvature, water blockoff ball (4-2) is slidingly connected at pushing rod sleeve (4-1) inside; The inner round wall face on upper plenum (1-4) top of the cylindrical wall of one way valve (4) and housing (1) is slidingly connected, the port surface of the inlet end face on one way valve (4) top by spill elastic washer sheet (5) and upper plenum (1-4) top through hole (1-6) be apical grafting mutually, have through hole (1-8) between the inwall of the upper plenum (1-4) of housing (1) and housing (1) inner headed face, through hole (1-8) position is arranged on the outlet (4-4) of one way valve (4) and locates; Screw-nut body (3) is made up of leading screw (3-1), square toes sleeve nut (3-2); The male end of leading screw (3-1) is threaded with square toes sleeve nut's (3-2) female end; Screw-nut body (3) is arranged in the top square hole of following cavity (1-5) of housing (1) and with housing (1) and is slidingly matched, motor (2) is arranged in the bottom of following cavity (1-5) of housing (1), the round bar end of square toes sleeve nut (3-2) in the screw-nut body (3) slides and passes on the water blockoff ball (4-2) in the pushing rod sleeve (4-1) of circular hole (1-7) back apical grafting in one way valve (4) in the housing (1) the rotating shaft end of the leading screw (3-1) in the screw-nut body (3) and coaxial connection of rotating shaft of motor (2).

2. the separate zone water shutoff device that oil exploitation well according to claim 1 is used is characterized in that the sidewall of described housing (1) is provided with the threading pipeline (6) of up/down perforation.

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