Oil exploitation underground reversing system based on electric drive hydraulic technology

Abstract

The invention relates to the field of oil exploitation, in particular to an oil exploitation underground reversing system based on an electric drive hydraulic technology, which comprises a ground control center, a mechanical sliding sleeve, a control pipeline and a plurality of underground control terminals. The mechanical sliding sleeve is arranged along the drill hole, an interlayer is arranged in the side wall of the mechanical sliding sleeve, and a plurality of flow channels are further formed in the side wall of the mechanical sliding sleeve. The control pipeline is connected to a ground control center and arranged along an interlayer in the side wall of the mechanical sliding sleeve. The control pipeline comprises a power circuit and a control circuit; the plurality of underground control terminals are distributed in an internal interlayer along the mechanical sliding sleeve, and each underground control terminal comprises an electric drive hydraulic system and a gate; the ground control center controls the electric drive hydraulic system in real time through a control pipeline; the gate is arranged on the side wall of the mechanical sliding sleeve; the electrically-driven hydraulic system is connected to the gate and drives the gate to be opened or closed. The problems that manual underground line changing is difficult, potential safety hazards are large, and accuracy and timeliness are difficult to guarantee when underground line changing is conducted through a ground hydraulic system are solved.

Description

Technical Field

[0001] The present invention relates to the field of oil production, and in particular to an oil production downhole reversing system based on electric drive hydraulic technology. Background Art

[0002] In the process of oil extraction, as the development of oil fields deepens, the number of rock fractures continues to increase. When it is necessary to separately extract oil from different rock fractures, it is necessary to control the corresponding openings of the downhole lines, which increases the complexity and management difficulty of the downhole oil lines. Traditional downhole oil line switching operations often rely on manual intervention, which is not only inefficient, but also poses safety hazards. Especially in deep wells and complex geological conditions, manual operation is extremely difficult. Therefore, it is particularly important to develop an efficient, safe and automated downhole reversing system. The existing downhole reversing system generally transmits pressure to the downhole through the hydraulic oil circuit through the ground hydraulic system, and then controls the corresponding opening in the downhole to open or close, thereby realizing the line switching operation. When the control command reaches the corresponding opening, it is often difficult to ensure the accuracy and timeliness of the opening. Summary of the invention

[0003] The purpose of the present invention is to provide an oil well drilling reversing system based on electric drive hydraulic technology, which solves the problems of difficulty in manual underground line changing, great safety hazards, and difficulty in ensuring the accuracy and timeliness of underground line changing by ground hydraulic system.

[0004] The embodiments of the present invention are implemented by the following technical solutions:

[0005] An oil well drilling downhole reversing system based on electric drive hydraulic technology, comprising:

[0006] Ground Control Centre;

[0007] A mechanical sleeve is arranged along the drilled hole, a sandwich layer is arranged in the side wall thereof, and a plurality of flow channels penetrating the inside of the mechanical sleeve are also arranged on the side wall thereof;

[0008] A control pipeline, one end of which is connected to a ground control center and is arranged along the interlayer inside the side wall of the mechanical sleeve; the control pipeline includes a power supply line and a control line;

[0009] A plurality of downhole control terminals are distributed in the inner interlayer along the mechanical sleeve, including an electric-driven hydraulic system and a gate; the ground control center controls the electric-driven hydraulic system in real time through a control pipeline; the gate is arranged at the flow channel on the side wall of the mechanical sleeve; the electric-driven hydraulic system is connected to the gate to drive the gate to open or close.

[0010] The electric drive hydraulic system includes a motor, an oil pump, an oil storage tank and a hydraulic cylinder; the oil pump is driven by the motor; one end of the hydraulic cylinder is connected to the gate; and the oil storage tank is connected to the oil pump and the hydraulic cylinder through oil circuits.

[0011] The oil circuit includes pipe a, pipe b, pipe c, pipe d, pipe e and an oil circuit reversing valve; the output end of the oil pump is connected to the oil storage tank through pipe a, and is connected to one side of the oil circuit reversing valve through pipe b; the input end of the hydraulic cylinder is connected to one side of the oil circuit reversing valve through pipe c; the output end of the hydraulic cylinder is connected to one side of the oil circuit reversing valve through pipe d; the oil storage tank is also connected to one side of the oil circuit reversing valve through pipe e; the oil circuit reversing valve and the motor are electrically connected to the ground control center through control lines.

[0012] Both the pipe a and the pipe b are provided with a one-way valve; the one-way valve on the pipe a points to the oil pump; the one-way valve on the pipe b points to the oil circuit reversing valve.

[0013] A control method for a downhole reversing system for oil production based on electric drive hydraulic technology comprises the following steps:

[0014] Step 1: The ground control center sends a line change command to the underground according to the demand;

[0015] Step 2, the command is transmitted to multiple downhole control terminals through the control line;

[0016] Step 3, in the downhole control terminal where the gate needs to be closed, the motor drives the oil pump to pump the hydraulic oil from the oil storage tank to the input end of the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged from the output end to the oil storage tank, so that the flow channel on one side is closed;

[0017] Step 4, in the downhole control terminal where the gate needs to be opened, the motor drives the oil pump to pump the hydraulic oil from the oil storage tank to the output end of the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged from the input end to the oil storage tank, thereby opening the flow channel on one side.

[0018] The step 3 comprises:

[0019] Step 3-1, when the gate closing step is performed, the oil circuit reversing valve connects pipe b and pipe c, and connects pipe d and pipe e respectively;

[0020] Step 3-2, the motor drives the oil pump to work, and the hydraulic oil is pumped into the chamber in the oil pump along the pipe a through the one-way valve;

[0021] Step 3-3, the oil pump then pushes out the hydraulic oil, so that the hydraulic oil passes through the one-way valve and flows into the internal chamber of the input end of the hydraulic cylinder along pipes b and c in sequence, and at the same time, the hydraulic oil in the internal chamber of the output end of the hydraulic cylinder is discharged into the oil storage tank along pipes d and e in sequence;

[0022] Step 3-4, repeat steps 3-2 and 3-3, and the output end of the hydraulic cylinder can push the gate to close the flow channel.

[0023] The step 4 comprises:

[0024] Step 4-1, when the gate opening step is performed, the oil circuit reversing valve connects pipe b and pipe d, and connects pipe c and pipe e respectively;

[0025] Step 4-2, the motor drives the oil pump to work, and the hydraulic oil is pumped into the chamber in the oil pump along the pipe a through the one-way valve;

[0026] Step 4-3, the oil pump then pushes out the hydraulic oil, so that the hydraulic oil passes through the one-way valve and flows into the internal chamber of the output end of the hydraulic cylinder along pipes b and d in sequence, while the hydraulic oil in the internal chamber of the input end of the hydraulic cylinder is discharged into the oil storage tank along pipes c and e in sequence;

[0027] Step 4-4, repeat steps 4-2 and 4-3, and the output end of the hydraulic cylinder can pull the gate to open the flow channel.

[0028] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0029] 1. The present invention is a downhole reversing system for oil production based on electric drive hydraulic technology. Since the existing hydraulic system generally adopts a hydraulic system set on the ground, when transmitting to the downhole through the hydraulic oil circuit, its hydraulic pipeline is too long, which limits the response speed and affects timeliness, and the hydraulic pipeline is easily squeezed, affecting normal operation. Therefore, the present invention sends instructions remotely through the ground control center, and then only controls the downhole control terminal to open or close it through the control pipeline, so that its response speed is accelerated and the line change operation can be realized in time;

[0030] 2. The present invention is a downhole reversing system for oil production based on electric drive hydraulic technology. When the hydraulic system arranged on the ground transmits to the downhole through the hydraulic oil circuit, its pipeline goes deep into the downhole, which makes the liquid pressure too high and there is a safety hazard. In addition, the depth of the hydraulic pipeline is limited when entering the well. Therefore, the present invention arranges a number of separate downhole control terminals on the mechanical sleeve downhole, which integrate the electric drive hydraulic system, and can control the opening or closing of the corresponding gate through a separate hydraulic cycle, so as to realize remote downhole line change, avoid the hydraulic pipeline being too long, and further improve its response speed;

[0031] 3. The present invention is an underground oil production reversing system based on electric drive hydraulic technology. The control pipeline and underground control terminal used are both arranged in the interlayer of the mechanical sleeve. A gate that can be opened and closed is arranged in the interlayer. It is opened and closed in accordance with the reversing instruction and is placed underground together with the mechanical sleeve to control the import and export of oil production in different sections, which effectively utilizes space resources and reduces the floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional schematic diagram of a local structure of an embodiment;

[0033] Figure 2 Yes Figure 1 Enlarged view of point A in the middle.

[0034] In the figure, 1-rock layer, 101-rock crack, 102-drill hole, 2-mechanical sliding sleeve, 201-flow channel, 3-motor, 4-oil pump, 5-oil storage tank, 6-hydraulic cylinder, 7-gate, 8-oil circuit, 801-check valve, 802-oil circuit reversing valve, 803-pipe a, 804-pipe b, 805-pipe c, 806-pipe d, 807-pipe e. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example

[0038] like Figure 1 and 2As shown, a downhole reversing system for oil production based on electric drive hydraulic technology includes a ground control center, a mechanical sleeve 2, a control pipeline and several downhole control terminals; the ground control center is arranged at the wellhead, and includes a central controller, a command sending module and a status monitoring module; the mechanical sleeve 2 extends vertically to the downhole along the borehole 102 arranged inside the rock formation 1; a sandwich structure is arranged inside the side wall of the mechanical sleeve 2, which is used to accommodate the control pipeline and the downhole control terminal; the control pipeline includes a power supply line and a control line; one end of the power supply line is connected to a power supply arranged on the ground, and the other end is connected to several downhole control terminals along the mechanical sleeve 2, which is used to supply energy to the downhole control terminals; the staff controls the command sending module through the central controller, and remotely sends the line change command through the control line and receives the feedback signal of the downhole control terminal in real time; it should be noted that the central controller, the command sending module and the status monitoring module included in the ground control center are all existing technologies, which are only used for sending and receiving signals and performing control, and are not the improvement of this embodiment, and will not be described in detail here;

[0039] A plurality of flow channels 201 are provided on the side wall of the mechanical sleeve 2, and the flow channels 201 penetrate into the interior of the mechanical sleeve 2 and are used to connect or block the oil path 8; a plurality of downhole control terminals are distributed at intervals along the mechanical sleeve 2, and each terminal includes an electric drive hydraulic system and a gate 7; the ground control center controls the electric drive hydraulic system in real time through a control pipeline; the gate 7 is provided at the flow channel 201 on the side wall of the mechanical sleeve 2; the electric drive hydraulic system is connected to the gate 7 to drive the gate 7 to open or close;

[0040] The electric drive hydraulic system includes a motor 3, an oil pump 4, an oil storage tank 5, a hydraulic cylinder 6 and an oil circuit 8; the oil pump 4 is driven by the motor 3, and the motor 3 is connected to the ground control center through a control line to receive start and stop instructions; the oil pump 4, the oil storage tank 5 and the hydraulic cylinder 6 are connected to each other through the oil circuit 8; the oil circuit 8 includes a pipe a803, a pipe b804, a pipe c805, a pipe d806, a pipe e807 and an oil circuit reversing valve 802; the input end of the oil pump 4 is connected to the oil storage tank 5 through a pipe a803, and the output end is connected to the oil circuit reversing valve 802 through a pipe b804; a one-way valve 801 is arranged on each of the pipe a803 and the pipe b804, the one-way valve 801 of the pipe a803 points to the oil pump 4, and the one-way valve 801 of the pipe b804 points to the oil circuit reversing valve 802; when the oil pump 4 performs an oil pumping step During the operation, the one-way valve 801 of the tube a803 can facilitate the hydraulic oil in the oil storage tank 5 to pass into the oil pump 4, while the one-way valve 801 of the tube b804 can prevent the hydraulic oil therein from flowing back; the input end of the hydraulic cylinder 6 is connected to the oil circuit reversing valve 802 through the tube c805, and the output end is connected to the oil circuit reversing valve 802 through the tube d806; the oil storage tank 5 is also connected to the oil circuit reversing valve 802 through the tube e807; the oil circuit reversing valve 802 is connected to the ground control center through a control line, which is used to switch the direction of the oil circuit 8, and then control the opening or closing of the valve; it should be noted that the oil pump 4, the hydraulic cylinder 6 and the oil circuit reversing valve 802 are all prior arts, which are only used for the electric drive hydraulic system to control the opening or closing of the valve, and are not the improvement of this embodiment, and will not be described in detail here.

[0041] The working principle of this embodiment is:

[0042] A control method for a downhole reversing system for oil production based on electric drive hydraulic technology comprises the following steps:

[0043] Step 1: The ground control center sends a line change command to the underground according to the demand;

[0044] Step 2, the command is transmitted to multiple downhole control terminals through the control line;

[0045] Step 3, in the downhole control terminal where the gate 7 needs to be closed, first the oil circuit reversing valve 802 works to connect the pipe b804 and the pipe c805, and to connect the pipe d806 and the pipe e807; the motor 3 drives the oil pump 4 to work, and the hydraulic oil is pumped into the chamber in the oil pump 4 along the pipe a803 through the one-way valve 801; then the oil pump 4 pushes out the hydraulic oil, so that the hydraulic oil passes through the one-way valve 801, and successively along the pipe b804 and the pipe c805, and passes into the internal chamber of the input end of the hydraulic cylinder 6, and at the same time, the hydraulic oil in the internal chamber of the output end of the hydraulic cylinder 6 is discharged into the oil storage tank 5 along the pipe d806 and the pipe e807; the above steps are repeated, and the hydraulic oil pump 4 in the oil storage tank 5 is continuously pumped into the chamber of the input end of the hydraulic cylinder 6, and the hydraulic oil in the chamber of the output end of the hydraulic cylinder 6 is discharged into the oil storage tank 5, and the output end of the hydraulic cylinder 6 can push the gate 7 to close the flow channel 201;

[0046] Step 4, in the downhole control terminal where the gate 7 needs to be opened, first the oil circuit reversing valve 802 works to connect the pipe b804 and the pipe d806, and to connect the pipe c805 and the pipe e807; the motor 3 drives the oil pump 4 to work, and the hydraulic oil is pumped into the chamber in the oil pump 4 along the pipe a803 through the one-way valve 801; then the oil pump 4 pushes the hydraulic oil out, so that the hydraulic oil passes through the one-way valve 801, and successively along the pipe b804 and the pipe d806, and enters the hydraulic The hydraulic oil in the internal chamber of the output end of the hydraulic cylinder 6 and the internal chamber of the input end of the hydraulic cylinder 6 are discharged into the oil storage tank 5 along the pipe c805 and the pipe e807 in turn; the above steps are repeated to continuously pump the hydraulic oil 4 in the oil storage tank 5 into the chamber of the output end of the hydraulic cylinder 6, and discharge the hydraulic oil in the chamber of the input end of the hydraulic cylinder 6 into the oil storage tank 5, and the output end of the hydraulic cylinder 6 can pull the gate 7 to open the flow channel 201; thereby completing the downhole switching operation.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A downhole reversing system for oil production based on electric drive hydraulic technology, characterized in that: include: Ground Control Centre; A mechanical sleeve is arranged along the drilled hole, a sandwich layer is arranged in the side wall thereof, and a plurality of flow channels penetrating the inside of the mechanical sleeve are also arranged on the side wall thereof; A control pipeline, one end of which is connected to a ground control center and is arranged along the interlayer inside the side wall of the mechanical sleeve; the control pipeline includes a power supply line and a control line; A plurality of downhole control terminals are distributed along the mechanical sleeve in the internal interlayer thereof, including an electric-driven hydraulic system and a gate; the ground control center controls the electric-driven hydraulic system in real time through a control pipeline; the gate is arranged at the flow channel on the side wall of the mechanical sleeve; the electric-driven hydraulic system is connected to the gate to drive the gate to open or close.

2. According to claim 1, a downhole reversing system for oil production based on electric drive hydraulic technology is characterized in that: The electric drive hydraulic system includes a motor, an oil pump, an oil storage tank and a hydraulic cylinder; the oil pump is driven by the motor; one end of the hydraulic cylinder is connected to the gate; and the oil storage tank is connected to the oil pump and the hydraulic cylinder through oil circuits.

3. According to claim 2, a downhole reversing system for oil production based on electric drive hydraulic technology is characterized in that: The oil circuit includes pipe a, pipe b, pipe c, pipe d, pipe e and an oil circuit reversing valve; the output end of the oil pump is connected to the oil storage tank through pipe a, and is connected to one side of the oil circuit reversing valve through pipe b; the input end of the hydraulic cylinder is connected to one side of the oil circuit reversing valve through pipe c; the output end of the hydraulic cylinder is connected to one side of the oil circuit reversing valve through pipe d; the oil storage tank is also connected to one side of the oil circuit reversing valve through pipe e; the oil circuit reversing valve and the motor are electrically connected to the ground control center through control lines.

4. According to claim 3, a downhole reversing system for oil production based on electric drive hydraulic technology is characterized in that: Both the pipe a and the pipe b are provided with a one-way valve; the one-way valve on the pipe a points to the oil pump; the one-way valve on the pipe b points to the oil circuit reversing valve.

5. A control method for a downhole oil production reversing system based on electric drive hydraulic technology according to claim 1, characterized in that: The following steps are involved: Step 1: The ground control center sends a line change command to the underground according to the demand; Step 2, the command is transmitted to multiple downhole control terminals through the control line; Step 3, in the downhole control terminal where the gate needs to be closed, the motor drives the oil pump to pump the hydraulic oil from the oil storage tank to the input end of the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged from the output end to the oil storage tank, so that the flow channel on one side is closed; Step 4, in the downhole control terminal where the gate needs to be opened, the motor drives the oil pump to pump the hydraulic oil from the oil storage tank to the output end of the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged from the input end to the oil storage tank, thereby opening the flow channel on one side.

6. The oil production downhole reversing system based on electric drive hydraulic technology according to claim 5 is characterized in that: The step 3 comprises: Step 3-1, when the gate closing step is performed, the oil circuit reversing valve connects pipe b and pipe c, and connects pipe d and pipe e respectively; Step 3-2, the motor drives the oil pump to work, and the hydraulic oil is pumped into the chamber in the oil pump along the pipe a through the one-way valve; Step 3-3, the oil pump then pushes out the hydraulic oil, so that the hydraulic oil passes through the one-way valve and flows into the internal chamber of the input end of the hydraulic cylinder along pipes b and c in sequence, and at the same time, the hydraulic oil in the internal chamber of the output end of the hydraulic cylinder is discharged into the oil storage tank along pipes d and e in sequence; Step 3-4, repeat steps 3-2 and 3-3, and the output end of the hydraulic cylinder can push the gate to close the flow channel.

7. The oil production downhole reversing system based on electric drive hydraulic technology according to claim 5 is characterized in that: The step 4 comprises: Step 4-1, when the gate opening step is performed, the oil circuit reversing valve connects pipe b and pipe d, and connects pipe c and pipe e respectively; Step 4-2, the motor drives the oil pump to work, and the hydraulic oil is pumped into the chamber in the oil pump along the pipe a through the one-way valve; Step 4-3, the oil pump then pushes out the hydraulic oil, so that the hydraulic oil passes through the one-way valve and flows into the internal chamber of the output end of the hydraulic cylinder along pipes b and d in sequence, while the hydraulic oil in the internal chamber of the input end of the hydraulic cylinder is discharged into the oil storage tank along pipes c and e in sequence; Step 4-4, repeat steps 4-2 and 4-3, and the output end of the hydraulic cylinder can pull the gate to open the flow channel.

Images