CN111255386B

CN111255386B - Horizontal well segmented oil production process pipe column

Info

Publication number: CN111255386B
Application number: CN202010042462.5A
Authority: CN
Inventors: 侯新宇; 张庆龙; 孙继国
Original assignee: Daqing Heidimiao Heavy Oil Production Test Technology Development Co ltd
Current assignee: Daqing Heidimiao Heavy Oil Production Test Technology Development Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-08-11
Anticipated expiration: 2040-01-15
Also published as: CN111255386A

Abstract

The invention belongs to the technical field of horizontal well oil production processes, and particularly relates to a horizontal well segmented oil production process pipe column which comprises an oil well pump, a cable butt-joint device, a cable-passing oil pipe anchor, an electric control packer and an electric control production allocator. The butt joint mode can effectively avoid violent collision between the plug assembly and the socket assembly, thereby improving the reliability of cable butt joint and prolonging the service life of the cable butt joint device.

Description

Horizontal well segmented oil production process pipe column

Technical Field

The invention belongs to the technical field of horizontal well oil extraction processes, and particularly relates to a horizontal well sectional oil extraction process pipe column.

Background

The horizontal well technology is a novel oil extraction technology in China, can increase the contact area between a well hole and an oil reservoir, increase the oil drainage area, reduce the seepage resistance and greatly improve the single well yield. The water is required to be found and blocked when the oil is extracted from the horizontal well, most of the existing water finding and blocking modes are mechanical water blocking, the construction process is complex, the construction period is long, and the efficiency is low. In order to solve the problem, the invention patent with the patent number of CN201510288629.5 discloses a horizontal well water finding and blocking and oil layer pressure monitoring device, and the water finding and blocking process is carried out in an electric control mode, so that the problem is effectively solved. However, this device has two significant drawbacks: 1. when the cable butt-joint device is in butt joint, parts on the butt-joint plug and the butt-joint socket are damaged after colliding with each other due to inevitable impact, and the reliability and the service life of the cable butt-joint device are seriously influenced. 2. The electric packer in the device has the disadvantages of complex structure, multiple sealing points and poor working reliability. Therefore, a need exists for a more reliable horizontal well production process string.

Disclosure of Invention

The invention provides a horizontal well sectional oil extraction process pipe column, which aims to solve the problems in the background technology.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the electric cable butt connector comprises an oil well pump, a cable butt connector, a cable-passing oil pipe anchor, an electric control packer and an electric control production allocator, wherein the electric control packer and the electric control production allocator are connected with cables for supplying power, the cables extend upwards to the ground;

in the cable butt connector, the socket component is slidably mounted in a cable butt connector shell, an electric push rod is arranged in the cable butt connector shell, a slide rod is arranged on the electric push rod, the socket component is fixedly mounted at the tail end of the slide rod and can move axially under the driving of the electric push rod, the plug component is connected to the cable butt connector shell through a ball locking mechanism, the ball locking mechanism comprises an inclined hole, a lock ball and a lock groove, the inclined hole is machined in the side face of the lower end of the cable butt connector shell, the lower end of the inclined hole is located on the inner side of the cable butt connector shell, the lock ball is mounted in the inclined hole, the lock groove is machined in the side face of the plug component, the lock groove is an annular groove, the cross section of the lock groove is arc-shaped, and the diameter of the arc-shaped lock ball is equal to the.

As a further technical scheme, the structure of the electric control packer comprises an upper joint, a lower joint, a central pipe, a setting piston, a piston sleeve, a rubber cylinder and an electromagnetic driving mechanism, wherein the upper joint and the lower joint are respectively connected to the upper end and the lower end of the central pipe through threads, the upper end of the piston sleeve is connected to the upper joint through threads, the setting piston is inserted into the piston sleeve, and during setting, the setting piston slides along the outer wall of the central pipe under the action of the electromagnetic driving mechanism so as to compress the rubber cylinder and enable the rubber cylinder to be set.

As a further technical scheme, the electromagnetic driving mechanism comprises an electromagnetic assembly, a permanent magnet, a magnet yoke and a return spring, the electromagnetic assembly is fixedly connected to the outer wall of the central tube through threads and is powered through a cable, the permanent magnet is positioned right below the electromagnetic assembly, an electromagnetic coil is arranged in the electromagnetic assembly, after the electromagnetic coil is electrified, the electromagnetic assembly and the permanent magnet are mutually exclusive, the permanent magnet is embedded on the upper end surface of the magnet yoke, the side surface of the magnet yoke is processed with an annular groove, a clamp spring is installed in the annular groove, the outer side of the clamp spring and the inner side of the setting piston are respectively provided with one-way retaining threads which are mutually matched, the one-way retaining threads enable the clamp spring to only upwards slide along the inner wall of the setting piston, the return spring is sleeved on the outer side of the central tube and located between the magnet yoke and the setting piston, and the magnet yoke always keeps an upward movement trend under the action of the return spring.

As a further technical scheme, the electromagnetic driving mechanism further comprises a piston rod, a fixed seat and an auxiliary piston, the fixed seat is fixedly installed on the central tube or the piston sleeve, an axial through hole is formed in the fixed seat, the piston rod is inserted into the through hole from the upper end, the auxiliary piston is inserted into the piston sleeve, a sealing cavity is formed between the auxiliary piston and the fixed seat, and the sealing cavity and the through hole in the fixed seat are filled with silicone grease.

As an alternative scheme, the structure of the electromagnetic assembly includes a motor, an upper magnetic ring and a lower magnetic ring, wherein the upper magnetic ring is sleeved outside the central tube and can rotate under the driving of the motor, the lower magnetic ring is connected to the central tube through threads, four fan-shaped magnets are respectively embedded on the lower end face of the upper magnetic ring and the upper end face of the lower magnetic ring, and two adjacent ends of two fan-shaped magnets on the upper magnetic ring or the lower magnetic ring are both S poles or both N poles.

The invention has the beneficial effects that:

1. according to the invention, the electric push rod is additionally arranged in the cable butt connector, before the plug assembly and the socket assembly are plugged, the slide rod on the electric push rod is positioned at the upper limit position, and after the plug assembly and the cable butt connector shell are stably connected through the ball locking mechanism, the electric push rod is started to drive the socket assembly to move downwards, so that the plug assembly and the socket assembly are plugged. The butt joint mode can effectively avoid violent collision between the plug assembly and the socket assembly, thereby improving the reliability of cable butt joint and the service life of the cable butt joint device.

2. Compared with the prior art, the invention has the advantages that the structure is greatly simplified, the working reliability is greatly increased, and the overall reliability of the segmented oil extraction process tubular column is effectively improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a cable dockee;

FIG. 3 is a schematic structural view of the plug assembly of FIG. 2;

FIG. 4 is a schematic structural diagram of an electrically controlled packer;

FIG. 5 is a schematic structural view of a second embodiment of an electrically controlled packer;

FIG. 6 is a schematic structural view of a third embodiment of an electrically controlled packer;

FIG. 7 is an enlarged, fragmentary, schematic view of the electromagnetic assembly of FIG. 6;

FIG. 8 is a schematic view of the distribution and magnetic pole orientation of the upper segment magnets on the lower end surface of the upper magnetic ring or the upper end surface of the lower magnetic ring in FIG. 7;

FIG. 9 is an enlarged schematic view of the lower half of FIG. 2;

FIG. 10 is a partial enlarged view of the portion A in FIG. 4

In the figure: 1-oil well pump, 2-cable butt joint device, 3-cable-passing oil pipe anchor, 4-electric control packer, 5-electric control production allocator, 6-oil pipe column, 7-cable, 8-locking ball, 9-inclined hole, 10-electric conducting ring, 11-socket assembly, 12-sliding rod, 13-electric push rod, 14-liquid passing channel, 15-buffer spring, 16-locking groove, 17-upper joint, 18-piston sleeve, 19-central tube, 20-reset spring, 21-setting piston, 22-rubber barrel, 23-lower joint, 24-electromagnetic assembly, 25-electromagnetic coil, 26-permanent magnet, 27-magnetic yoke, 28-snap spring, 29-one-way retaining thread, 30-piston rod, 31-fixing seat, 32-silicone grease, 33-auxiliary piston, 34-motor, 35-upper magnetic ring, 36-sector magnet, 37-lower magnetic ring, and 38-cable butt connector shell.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the present embodiment includes an oil well pump 1, a cable butt joint device 2, a cable-passing tubing anchor 3, an electronic control packer 4 and an electronic control production allocator 5, wherein the electronic control packer 4 and the electronic control production allocator 5 are connected with a cable 7 for supplying power, and the cable 7 extends upwards to the ground. The cable butt-joint device 2 is equivalent to a pair of plug and socket which are arranged in the underground, and the function of the cable butt-joint device is to form a circuit breaking point which can be repeatedly connected or disconnected in the underground, so that the tubing string 6 and the cable below the cable butt-joint device 2 can not be influenced by the pump detection operation when the pump is detected.

As shown in fig. 2 and 3, the cable butt connector 2 includes a plug component and a socket component 11, a cable 7 is connected to each of the plug component and the socket component 11, a jack matched with the plug component is provided in the socket component 11, a set of conducting rings 10 are respectively provided on an outer side of the plug component and an inner side of the jack, the conducting rings 10 on the plug component are connected to a terminal of the cable 7 on the plug component, the conducting rings 10 on the socket component 11 are connected to a terminal of the cable 7 on the socket component 11, and after the plug component is plugged into the socket component 11, the conducting rings 10 in the two sets of conducting rings 10 are in contact with each other two by two, so as to communicate the cable 7 connected to the plug component with the cable. The above structure of the cable butt connector 2 is the structure already existing in the prior art, and is not described in detail herein.

A first important innovative aspect of the present invention is the improvement of the cable butt connector.

When the cable butt connector 2 is installed, the plug assembly needs to be installed underground, and then the socket assembly 11, the cable butt connector shell 38 and the oil well pump 1 are put into the well together, and finally the butt joint of the plug assembly and the socket assembly 11 is completed. In actual operation, due to the limitation of operation precision of the operation vehicle, impact is inevitably generated when the cables are butted, and when the impact occurs between the plug assembly and the socket assembly, damage cannot be avoided, so that the problems of short circuit or poor contact and the like are caused. In the invention, the electric push rod 13 is additionally arranged in the cable butt-joint device 2, before the plug component and the socket component 11 are plugged, the slide rod 12 on the electric push rod 13 is positioned at the upper limit position, after the plug component and the cable butt-joint device shell 38 are stably connected through the ball locking mechanism, the electric push rod 13 is started to enable the slide rod 12 to drive the socket component 11 to move downwards, and then the plug component and the socket component 11 are plugged. This mating arrangement effectively avoids a violent collision between the plug assembly and the receptacle assembly 11, thereby improving the reliability of the cable mating and the service life of the cable dockee 2.

As shown in fig. 2 and 3, in the cable butt connector 2 of the present invention, the socket assembly 11 is slidably mounted in a cable butt connector housing 38, an electric push rod 13 is disposed in the cable butt connector housing 38, a slide rod 12 is disposed on the electric push rod 13, the socket assembly 11 is fixedly installed at the end of the sliding rod 12 and can move along the axial direction under the driving of the electric push rod 13, the plug assembly is connected to the cable butt connector housing 38 by a ball lock mechanism, which includes a slanted hole 9, a lock ball 8 and a lock slot 16, wherein, the inclined hole 9 is processed on the side surface of the lower end of the cable butt connector shell 38, the lower end of the inclined hole 9 is positioned on the inner side of the cable butt connector shell 38, the locking ball 8 is arranged in the inclined hole 9, the locking groove 16 is machined on the side face of the plug assembly, the locking groove 16 is an annular groove, the cross section of the locking groove 16 is arc-shaped, and the diameter of the arc-shaped groove is equal to that of the locking ball 8.

In the specific implementation process, the following points need to be noticed at the cable butt-joint device 2:

first, a vertically through-going fluid passage 14 must be provided in the cable butt connector 2, so that the produced fluid can be smoothly produced through the cable butt connector 2.

Secondly, in order to avoid the cable 7 from being broken during the expansion and contraction of the sliding rod 12, a redundant cable 7 is required to be arranged above the socket assembly 11, and in fig. 2, the cable 7 is made to be a spring shape to make redundancy, so as to prevent the cable 7 from being broken.

Thirdly, in order to make the connection of the ball-locking mechanism more stable, a buffer spring 15 is required to be arranged between the plug assembly and the lower end of the cable butt connector housing 38, and the buffer spring 15 may be a wave spring or a disc spring.

A second important innovation of the invention consists in the improvement of the way in which the electrically controlled packer 4 is controlled.

As shown in fig. 4, the electrically controlled packer 4 structurally comprises an upper joint 17, a lower joint 23, a central tube 19, a setting piston 21, a piston sleeve 18, a rubber cylinder 22 and an electromagnetic driving mechanism, wherein the upper joint 17 and the lower joint 23 are respectively connected to the upper end and the lower end of the central tube 19 through threads, the upper end of the piston sleeve 18 is connected to the upper joint 17 through threads, the setting piston 21 is inserted into the piston sleeve 18, and during setting, the setting piston 21 slides along the outer wall of the central tube 19 under the action of the electromagnetic driving mechanism, so as to compress the rubber cylinder 22 and set the rubber cylinder 22. Compared with the prior art in which a complex electric setting driving mechanism is adopted, the invention creatively adopts the electromagnetic driving mechanism, so that the setting mechanism is simplified, and the setting force and the setting distance are easier to guarantee.

As shown in fig. 3 and 10, the electromagnetic driving mechanism includes an electromagnetic assembly 24, a permanent magnet 26, a magnetic yoke 27 and a return spring 20, the electromagnetic assembly 24 is fixedly connected to the outer wall of the central tube 19 through threads and is powered by the cable 7, the permanent magnet 26 is located right below the electromagnetic assembly 24, an electromagnetic coil 25 is arranged in the electromagnetic assembly 24, after the electromagnetic coil 25 is powered on, the electromagnetic assembly 24 and the permanent magnet 26 repel each other, the permanent magnet 26 is embedded on the upper end surface of the magnetic yoke 27, an annular groove is processed on the side surface of the magnetic yoke 27, a snap spring 28 is installed in the annular groove, one-way check threads 29 matched with each other are respectively arranged on the outer side of the snap spring 28 and the inner side of the setting piston 21, the snap spring 28 can only slide upwards along the inner wall of the setting piston 21 due to the one-way check threads 29, the return spring 20 is sleeved on the outer side, the yoke 27 always maintains the upward movement tendency under the action of the return spring 20. When setting, the electromagnetic coil 25 is electrified through the cable 7 to be changed into an electromagnet, the permanent magnet 26 and the magnetic yoke 27 move downwards under the pushing of magnetic force, then the setting piston 21 is pushed to move downwards, finally the rubber cylinder 22 is compressed, when the repulsive force between the electromagnetic assembly 24 and the permanent magnet 26 is balanced with the reverse force applied by the rubber cylinder 22, the electromagnetic coil 25 is powered off, at the moment, the magnetic yoke 27 and the permanent magnet 26 thereon move upwards under the action of the reset spring 20 to reset, then the electromagnetic coil 25 is electrified, and the rubber cylinder 22 is continuously compressed until the setting requirement is met. It should be noted that, as the name suggests, the one-way retaining thread 29 is to make the circlip 28 move only in one direction relative to the setting piston 21, but not in the opposite direction, the thread of this mechanism is in the shape of a right triangle (commonly called as a horse tooth), and is widely applied to downhole tools such as packers and tubing anchors, and belongs to a common technical means, so the specific structure thereof is not described herein again.

In order to reduce the requirements on the carrying capacity of the cable 7 while ensuring the setting force, the invention provides another optimized electromagnetic driving mechanism. As shown in fig. 5, the electromagnetic driving mechanism further includes a piston rod 30, a fixing seat 31 and an auxiliary piston 33, the fixing seat 31 is fixedly installed on the central tube 19 or the piston sleeve 18, an axial through hole is formed in the fixing seat 31, the piston rod 30 is inserted into the through hole from the upper end, the auxiliary piston 33 is inserted into the piston sleeve 18, a sealing cavity is formed between the auxiliary piston 33 and the fixing seat 31, and the sealing cavity and the through hole in the fixing seat 31 are filled with silicone grease 32. The mechanism utilizes a hydraulic principle to enlarge the formation of the setting piston 21, but reduces the requirement on the magnitude of the magnetic repulsive force provided by the electromagnetic assembly, thereby reducing the requirement on the magnitude of the power supply current and finally reducing the requirement on the bearing capacity of the cable 7.

Alternatively, the electromagnetic assembly 24 includes a motor 34, an upper magnetic ring 35 and a lower magnetic ring 37, wherein the upper magnetic ring 35 is sleeved outside the central tube 19 and can rotate under the driving of the motor 34, the lower magnetic ring 37 is connected to the central tube 19 through a thread, four fan-shaped magnets 36 are respectively embedded on the lower end surface of the upper magnetic ring 35 and the upper end surface of the lower magnetic ring 37, and two adjacent ends of the two fan-shaped magnets 36 on the upper magnetic ring 35 or the lower magnetic ring 37 are the same as an S pole or the same as an N pole. In the above structure, the sector magnets 36 on the upper magnetic ring 35 and the lower magnetic ring 37 may have two corresponding states, one state is that the N pole and the S pole of one sector magnet 36 respectively correspond to the N pole and the S pole of the other sector magnet 36 up and down, and in this corresponding state, the repulsive force that the electromagnetic assembly 24 can provide is the superposition of the two sector magnets 36, so the repulsive force is the maximum; in another state, the N pole and the S pole of one sector magnet 36 respectively correspond to the S pole and the N pole of the other sector magnet 36 up and down, and in this corresponding state, the repulsive force provided by the electromagnetic assembly 24 is minimal or even zero, so as to ensure the smooth resetting of the magnetic yoke 27 and the permanent magnet 26. And the motor 34 is used for driving the upper magnetic ring 35 to rotate, so that the switching of two corresponding states is realized. A gear transmission mechanism consisting of a gear and an inner gear ring can be adopted between the output shaft of the motor 34 and the upper magnetic ring 35 to realize power transmission.

Claims

1. A horizontal well segmented oil extraction process pipe column comprises an oil well pump (1), a cable butt-joint device (2), a cable passing oil pipe anchor (3), an electric control packer (4) and an electric control production allocator (5), wherein the electric control packer (4) and the electric control production allocator (5) are connected with a cable (7) for supplying power, the cable (7) upwards extends to the ground, the cable butt-joint device (2) comprises a plug component and a socket component (11), the plug component is connected to a cable butt-joint device shell (38) through a ball locking mechanism, the plug component and the socket component (11) are respectively connected with a cable (7), a jack matched with the plug component is arranged in the socket component (11), the outer side of the plug component and the inner side of the jack are respectively provided with a group of conducting rings (10), and the conducting rings (10) on the plug component are connected to the tail end of the cable (, cable (7) end on socket subassembly (11) is connected in conducting ring (10) on socket subassembly (11), and after plug subassembly and socket subassembly (11) were pegged graft, two liang of contacts in each conducting ring (10) in two sets of conducting rings (10) to cable (7) and cable (7) the intercommunication of connection on socket subassembly (11) on the plug subassembly, its characterized in that will connect:

in the cable butt connector (2), the socket component (11) is slidably mounted in a cable butt connector shell (38), an electric push rod (13) is arranged in the cable butt connector shell (38), a slide rod (12) is arranged on the electric push rod (13), the socket component (11) is fixedly mounted at the tail end of the slide rod (12) and can move axially under the drive of the electric push rod (13), the ball locking mechanism comprises an inclined hole (9), a locking ball (8) and a locking groove (16), wherein the inclined hole (9) is processed on the side surface of the lower end of the cable butt connector shell (38), the lower end of the inclined hole (9) is positioned on the inner side of the cable butt connector shell (38), the locking ball (8) is mounted in the inclined hole (9), the locking groove (16) is processed on the side surface of the plug component, the locking groove (16) is an annular groove, and the cross section of the locking groove (16) is arc, and the diameter of the circular arc is equal to that of the locking ball (8).

2. The horizontal well staged oil recovery process string according to claim 1, wherein: the structure of automatically controlled packer (4) includes top connection (17), lower clutch (23), center tube (19), sit and seal piston (21), piston cover (18), packing element (22) and electromagnetic drive mechanism, top connection (17) and lower clutch (23) are respectively through threaded connection at the upper and lower both ends of center tube (19), threaded connection is passed through on top connection (17) in the upper end of piston cover (18), sit and seal piston (21) cartridge is in piston cover (18), during the seat, sit and seal piston (21) and slide along the outer wall of center tube (19) under electromagnetic drive mechanism's effect to compress packing element (22), make packing element (22) sit and seal.

3. The horizontal well staged oil recovery process string according to claim 2, wherein: the electromagnetic driving mechanism comprises an electromagnetic assembly (24), a permanent magnet (26), a magnet yoke (27) and a reset spring (20), the electromagnetic assembly (24) is fixedly connected to the outer wall of a central pipe (19) through threads and is powered through a cable (7), the permanent magnet (26) is located under the electromagnetic assembly (24), an electromagnetic coil (25) is arranged in the electromagnetic assembly (24), after the electromagnetic coil (25) is electrified, the electromagnetic assembly (24) and the permanent magnet (26) repel each other, the permanent magnet (26) is embedded on the upper end face of the magnet yoke (27), an annular groove is processed on the side face of the magnet yoke (27), a clamp spring (28) is installed in the annular groove, one-way backstop threads (29) which are matched with each other are respectively arranged on the outer side of the clamp spring (28) and the inner side of the setting piston (21), and the one-way backstop threads (29) enable the clamp spring (28) to only slide upwards along the, the return spring (20) is sleeved on the outer side of the central tube (19) and is positioned between the magnet yoke (27) and the setting piston (21), and the magnet yoke (27) always keeps an upward movement trend under the action of the return spring (20).

4. The horizontal well staged oil recovery process string according to claim 3, wherein: electromagnetic drive mechanism still includes piston rod (30), fixing base (31) and vice piston (33), and fixing base (31) fixed mounting is on center tube (19) or piston bush (18), is provided with the axial through-hole on fixing base (31), piston rod (30) are from the upper end cartridge in this through-hole, vice piston (33) cartridge is in piston bush (18), is sealed chamber between vice piston (33) and fixing base (31), and the through-hole intussuseption on this sealed chamber and fixing base (31) is filled with silicone grease (32).

5. The horizontal well staged oil recovery process string according to claim 2, wherein: the structure of the electromagnetic assembly (24) comprises a motor (34), an upper magnetic ring (35) and a lower magnetic ring (37), wherein the upper magnetic ring (35) is sleeved on the outer side of the central pipe (19) and can rotate under the driving of the motor (34), the lower magnetic ring (37) is connected onto the central pipe (19) through threads, four fan-shaped magnets (36) are respectively embedded on the lower end face of the upper magnetic ring (35) and the upper end face of the lower magnetic ring (37), and two adjacent ends of the two fan-shaped magnets (36) are the same S pole or the same N pole.