CN2750039Y

CN2750039Y - Wire rope hanging submersible electric screw pump oil extraction system

Info

Publication number: CN2750039Y
Application number: CN 200320125827
Authority: CN
Inventors: 李志�; 罗昌华
Original assignee: China National Offshore Oil Corp CNOOC; China Offshore Oil Bohai Co Ltd
Current assignee: China National Offshore Oil Corp CNOOC; China Offshore Oil Bohai Co Ltd
Priority date: 2003-12-16
Filing date: 2003-12-16
Publication date: 2006-01-04
Anticipated expiration: 2013-12-16

Abstract

The utility model discloses a wire rope hanging submersible electric screw pump oil extraction system, particularly an oil extraction system used in oil exploitation lifting technology. The system comprises a power cable, a screw pump machine set arranged under a well, a wire cable for suspending the screw pump machine set under a well, a wellhead wire cable sealing device arranged at the point of a wellhead, a wire cable connector for connecting the wire cable and the screw pump machine set, a packer and a centralizer, wherein the wellhead wire cable sealing device comprises a press cap, a sealing member and a tapered locking slip with a via hole and for slipping the wire cable; the wire cable connector adopts a tapered slip, and is provided with a fishing head; the packer is of a leather cup slip structure, and the outside of the packer is provided with a sliding bush and a supporting slip. The oil extraction system of the utility model can be used for the work condition environments of vertical wells, inclined vertical wells and inclined wells.

Description

Wire rope hangs the electric submersible screw pump oil extraction system

Technical field

The utility model relates to a kind of oil exploitation system, relates in particular to the oil extraction system in a kind of oil exploitation lifting technology.

Background technology

At present, screw pump mainly contains two kinds of forms in field use, and a kind of is that the ground bar drives, it is mainly used in the straight well work condition environment, for the inclined shaft work condition environment,, also in the inclined shaft environment, do not use the precedent that the ground bar drives both at home and abroad owing to have serious bar, pipe wearing and tearing; Another kind is an electric submersible screw pump, promptly takes screw pump to down-hole with oil pipe, and with oil pipe as oil discharge passage, there is certain limitation in this structure for big discharge capacity well, construction operation complexity, cost for oil production.

The utility model content

At above-mentioned prior art, the utility model provides a kind of wire rope of using to replace oil pipe to hang the oil extraction system of electric submersible screw pump, this oil extraction system form of construction work is simple, construction speed is fast, the oil recovery cost of production is low, comprise two kinds of structures of underneath type and overhead, can be widely used in straight well, oblique straight well and inclined shaft work condition environment.

In order to solve the problems of the technologies described above, the utility model wire rope hangs the technical scheme that the electric submersible screw pump oil extraction system adopted and is: described oil extraction system comprises power cable, place the screw pump unit of down-hole, be used for hanging the subsurface progressive cavity unit wire rope, be arranged on the well head place the cable wires at well head sealing device, be used for wire rope hookup, packer and centralizer that wire rope and screw pump unit are coupled together; Described cable wires at well head sealing device comprises pressure cap, seal and has via hole and be used for blocking the cone locking slips of wire rope; Described wire rope hookup adopts taper slips structure, and described wire rope hookup is provided with fishing head; Described packer is a leather cup slips structure, in its arranged outside sliding sleeve and supporting slip is arranged.

Packer also is provided with two axial via holes described in the utility model wire rope suspension electric submersible screw pump oil extraction system.Below the screw pump unit, also be provided with tail pipe.

Compared with prior art, the beneficial effects of the utility model are:

1. in the utility model oil extraction system,, both eliminated the wear problem of rod tube, do not needed bar, pipe centralizer again owing to removed traditional rod tube;

2. adopt the utility model oil extraction system, its form of construction work is simple, has accelerated construction speed, has saved resources such as great amount of manpower and material resources;

3. no matter from the tubing string cost, or the construction operation aspect all saved the oil recovery production cost widely, and economic benefit is obvious;

4. the utility model oil extraction system wide accommodation can be used for straight well, oblique straight well and inclined shaft work condition environment.

Description of drawings

Fig. 1 is that the utility model embodiment one underneath type wire rope hangs electric submersible screw pump oil extraction system schematic diagram;

Fig. 2 is the structural representation of cable wires at well head sealing device 3 in the utility model oil extraction system;

Fig. 3 is the structural representation of wire rope hookup 5 in the utility model oil extraction system;

Fig. 4 is the structural representation of the anchor packer of leather cup shown in Fig. 17;

Fig. 5 is that the utility model embodiment two overhead wire rope hang electric submersible screw pump oil extraction system schematic diagram.

It below is the explanation of main Reference numeral in the utility model Figure of description.

1---power cable 2---wire rope

3---cable wires at well head sealing device 4---strain relief clamp

5---wire rope hookup 6---safety pin

7---packer 8---screw pump

9---protector 10---speed changer

11---motor 12---pressure tester

13---centralizer 14---tail pipe

31---

pressure cap

32,35---seal

33---connectors 34---locking slips

51---pressure caps 52---locking slips

53---filler 54---fishing head

The outer fishing head of 55---safety pins 56---

71---cup packing part 72---axial passage

73---side direction switching sliding sleeve 74---supporting slip

The specific embodiment

Below in conjunction with accompanying drawing the utility model is done to describe in further detail.

Fig. 1 shows in the utility model oil extraction system and implements one, be that the underneath type wire rope hangs the electric submersible screw pump oil extraction system, it comprises the power cable 1 that is connected to the subsurface progressive cavity unit from aboveground, be used for hanging the wire rope 2 of subsurface progressive cavity unit, be arranged on the cable wires at well head sealing device 3 at well head place, be used for wire rope hookup 5 that wire rope 2 and screw pump unit are coupled together, safety pin 6, the packer 7 of leather cup slip-type structure, place the pressure tester 12 of screw pump unit below, centralizer 13 and tail pipe 14, described tail pipe weight is decided according to the pit shaft projected depth.For stationary power cable 1 and wire rope 2, also be provided with a plurality of strain relief clamps 4.

As shown in Figure 2, the utility model oil extraction system passes through well head in order to guarantee wire rope, and can guarantee the sealing of well head, be provided with cable wires at well head sealing device 3 at the well head place, described cable wires at well head sealing device 3 comprises pressure cap 31,

seal

32 and 35, connector 33 and has taper ladder via hole and be used for blocking the locking slips 34 of wire rope 2; Wherein, fill with elastomeric material and high-viscosity material in the seal 32, to guarantee the inside and outside sealing with well head of wire rope; In addition, in order to prevent in the wire rope 2 landing wells that described locking slips 34 adopts pyramidal structure to be used for blocking wire rope 2.

For wire rope 2 and down-hole leather cup anchor packer 7 and screw pump unit are coupled together, as shown in Figure 3, adopted the wire rope hookup 5 of cone locking slips structure in the utility model oil extraction system, comprise pressure cap 51, locking slips 52, filler 53, fishing head 54, safety pin 55 and outer fishing head 56, in addition, when wire rope 2 strength are not enough to trip out down-hole leather cup anchor packer 7 and screw pump unit, in order to guarantee to salvage with oil pipe, the fishing head that is arranged in the wire rope hookup can assist oil pipe to salvage.

Fig. 4 shows embodiment one in the utility model oil extraction system, be that the packer 7 that underneath type wire rope suspension electric submersible screw pump oil extraction system is adopted is leather cup slips structures, comprise cup packing part 71, two axial passages 72, but the sliding sleeve 73 and the supporting slip 74 of side direction switch are arranged in its arranged outside, between described sliding sleeve 73 and the supporting slip 74 for the conical surface contacts, the packer 7 of described leather cup slips structure set or deblocking be by on carry or transfer wire rope 2 and realize.

The function and the operating principle of described leather cup anchor packer 7 are described below in further detail.

71 fens oil removal well shafts of cup packing part are upper and lower two parts, formed oil discharge passage for screw pump 8 thus, promptly the outlet of screw pump 8 and inlet are separated, the oil of avoiding screw pump 8 outlets occurring flows backwards back inlet and forms circulation, makes screw pump 8 give rise to ground to shaft bottom liquid; In addition, can guarantee when ordinary production, make wire rope 2 not bear the well internal loading.Supporting slip 74 plays the effect of (promptly being made up of screw pump 8, protector 9, speed changer 10 and motor 11 etc.) of studdle pump assembly, has guaranteed the screw pump unit when operate as normal is rotated, can be in sleeve pipe play.Two axial passages 72, one of them is that oil discharge passage up and down links to each other with oil pipe or screw pump 8; Another is the passage of power cable 1, makes power cable 1 can pass through leather cup anchor packer 7, can guarantee the upper and lower seal isolation of leather cup anchor packer 7 again for a long time, and is normal to guarantee oil well lifting technology in long-term exploitation manufacturing process.Side direction switching sliding sleeve 73, rising/when down cup anchor packer 7 and screw pump unit, in order successfully to link up the leather cup anchor packer about in the of 7, leather cup anchor packer 7 can be descended to the down-hole, set the back sliding sleeve at leather cup anchor packer 7 slips and can close and form closed chamber, guarantee that screw pump 8 can ordinary production; When lift pipe string, can open again and link up the leather cup anchor packer about in the of 7, guarantee that leather cup anchor packer 7 can rise to such an extent that come up.In addition, the fish head on leather cup anchor packer 7 tops is shorter, is easy to sand washing, so can adapt to the oil well that shakes out.

In addition, the weight of tail pipe 14 is determined according to the pit shaft projected depth in the utility model oil extraction system, arrives the pit shaft projected depth 7 times to guarantee the leather cup anchor packer; Pressure tester 12 can adopt the PSI pressure tester, and when ordinary production, pressure tester 12 monitoring streams are pressed, during closing well, but pressure tester 12 geodetic stressor layers.

Narrate the utility model embodiment one below, the process when promptly the underneath type wire rope hangs the application of electric submersible screw pump oil extraction system.

At first, press Fig. 1 or shown in Figure 5, connect tail pipe 14 tubing strings/and centralizer 13, assemble screw pump unit (promptly assembling screw pump 8, protector 9, speed changer 10, motor 11 etc.)/and pressure tester, connect and go into the well by working stamndard; Then, carry out the sealing of wire rope 2 and power cable 1, wire rope 2 and power cable 1 are accomplished fluently strain relief clamp 4 and are continued to go into the well; That utilizes that cable wires at well head sealing device 3 carries out wire rope 2 and power cable 1 crosses well head sealing and fixing, connects the well head production tree, connects power cable, the production of can completion recovering the oil.Owing to designed unique anchor packer of cable leather cup excessively 7 in the utility model oil extraction system, thereby in whole oil recovery production process, open or close the axial passage 72 in the packer 7, overcome and remove the resistance of process in the lifting technology, thereby realized above-mentioned process.

Fig. 5 shows the utility model oil extraction system embodiment two, be that the overhead wire rope hangs the electric submersible screw pump oil extraction system, the main distinction that it and underneath type wire rope shown in Figure 1 hang the electric submersible screw pump oil extraction system is, leather cup anchor packer 7 is arranged on below the electric submersible screw pump unit, power cable 1 is leather cup anchor packer 7 only, thereby has simplified the design of leather cup anchor packer 7.

Although in conjunction with the accompanying drawings the utility model is described above; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of distortion, these all belong within the protection of the present utility model.

Claims

1. a wire rope hangs the electric submersible screw pump oil extraction system, comprise power cable, place screw pump unit, packer and the centralizer of down-hole, it is characterized in that: also comprise the wire rope, the cable wires at well head sealing device that is arranged on the well head place that are used for hanging the subsurface progressive cavity unit, be used for wire rope hookup that wire rope and screw pump unit are coupled together; Described cable wires at well head sealing device comprises pressure cap, seal and has via hole and be used for blocking the cone locking slips of wire rope; Described wire rope hookup adopts taper slips structure, and described wire rope hookup is provided with fishing head; Described packer is a leather cup slips structure, in its arranged outside sliding sleeve and supporting slip is arranged.

2. a kind of wire rope according to claim 1 hangs the electric submersible screw pump oil extraction system, and it is characterized in that: described packer also is provided with two axial via holes.

3. a kind of wire rope according to claim 1 hangs the electric submersible screw pump oil extraction system, it is characterized in that: also be provided with tail pipe below the screw pump unit.