WO2023097928A1 - 一种井下滑套层位选择和开度控制的液压系统及其方法 - Google Patents
一种井下滑套层位选择和开度控制的液压系统及其方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 210000002445 nipple Anatomy 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000033001 locomotion Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 284
- 239000010720 hydraulic oil Substances 0.000 description 40
- 229910000831 Steel Inorganic materials 0.000 description 28
- 239000010959 steel Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
Definitions
- the invention relates to the technical field of oil and gas exploitation, in particular to a hydraulic system for layer selection and opening control of a downhole sliding sleeve and a method thereof.
- the downhole flow control valve is the key control device to control the inflow of each production layer.
- the flow control valve can adjust the pressure between production layers, fluid flow rate, and wellbore inflow dynamics in real time, realize multi-layer mixed production, realize real-time control and optimized production of oil reservoirs, control water cone gas invasion, accelerate production, and improve recovery .
- a set of flow control valves needs to be installed for each production layer in the well.
- the full hydraulic control flow control valve includes two parts: layer selection and opening control.
- Layer selection determines the downhole target layer, and after the target layer is selected, the opening of the target layer is controlled to control the downhole flow rate of the target layer, while the sliding sleeves in other layers do not perform any operations.
- the present invention aims to provide a hydraulic system and method for layer selection and opening control of downhole sliding sleeves, so as to realize simple and convenient production control of oil and gas layers.
- the present invention is a hydraulic system for layer selection and opening control of downhole sliding sleeves, characterized in that the system includes:
- the layer selection pup joint includes a group of hydraulic input ports and a group of hydraulic output ports, and a first group of hydraulic control valves connected between the group of hydraulic input ports and a group of hydraulic output ports, configured to pass through the The group of hydraulic control valves controls the opening and closing of the group of hydraulic output ports;
- the high and low pressure selection pup joint includes a group of hydraulic connection ports, a group of high and low pressure output ports and oil return ports, and a second connection between the group of hydraulic connection ports and a group of high and low pressure output ports and oil return ports.
- a group of hydraulic control valves wherein the group of hydraulic connection ports are respectively connected to the group of hydraulic output ports in one-to-one correspondence, and are configured to pass through the input mode of the second group of hydraulic control valves and the layer selection sub-joint And the adjustment of pressurization controls the opening and closing of the set of high and low pressure output ports and the oil return port.
- the system includes a multi-layer control system, each layer control system includes the layer selection sub-joint and the high-low voltage selection sub-joint connected, and the multi-layer control system is connected in parallel.
- the system includes a six-layer control system, and the number of the group of hydraulic input ports is three.
- the layer selection sub also includes three oil passages
- the first group of hydraulic control valves includes two normally open hydraulic control check valves, four normally closed hydraulic control check valves
- the two ends of the three oil passages are respectively provided with corresponding hydraulic input ports and hydraulic output ports, wherein, a normally open hydraulic control check valve and a normally closed Hydraulic control one-way valve, two normally closed hydraulic control one-way valves are arranged in sequence on the second oil passage, and one normally closed hydraulic control one-way valve is installed on the third oil passage, leading out from the input port of the second oil passage
- a normally open hydraulically controlled check valve is jointly controlled with the normally open hydraulically controlled check valve on the first oil passage, and the other normally closed hydraulically controlled check valves are jointly controlled in pairs, finally leading to five hydraulic outputs mouth.
- the high and low pressure selection nipple further includes an output oil return hole and eight other oil passage holes
- the second group of hydraulic control valves includes two normally open hydraulic control check valves and Six normally closed hydraulically controlled one-way valves, one check valve is set on each oil passage, four oil passages form a group, forming two groups of symmetrical parallel oil circuits, in each group, two oil passages
- Two valves in the group are set for joint control; the output oil return hole is set in parallel with the two groups of oil circuits.
- the system further includes a sliding sleeve, the sliding sleeve includes a two-stage telescopic cylinder in the wall and radial holes distributed on the wall communicating with the inside and outside, the two-stage telescopic cylinder includes The first single-stage hydraulic cylinder and the second single-stage hydraulic cylinder; the first single-stage hydraulic cylinder includes the first single-stage hydraulic cylinder left chamber, the first single-stage hydraulic cylinder right chamber and the first single-stage hydraulic cylinder piston ;
- the second single-stage hydraulic cylinder includes a second single-stage hydraulic cylinder left chamber, a second single-stage hydraulic cylinder middle chamber, a second single-stage hydraulic cylinder right chamber and a second single-stage hydraulic cylinder piston;
- the cylinder part of the second single-stage hydraulic cylinder is connected to the piston rod part of the first single-stage hydraulic cylinder;
- the radial hole is the oil and gas flow channel of the downhole production layer; the output port of the high and low pressure selection sub-joint one by one Cor
- the present invention also proposes a method for using the hydraulic system according to the layer selection and opening control of the downhole sliding sleeve, the method comprising:
- the layer selection nipples of different layers are activated, and by controlling the pressure value of the corresponding hydraulic pipeline, different high and low pressure combinations are input to change the corresponding layer high and low pressure selection nipples.
- the oil delivery and oil return directions of the joint are configured to control the different movements of the pistons in the sliding sleeves of the corresponding layers, thereby realizing the control of the opening of the sliding sleeves of the corresponding layers.
- the output port of the high and low pressure selection sub-joint is connected to the piston cylinder of the two-stage hydraulic telescopic sliding sleeve, and the sliding sleeve is provided with a set of radial through holes at different positions, through which different piston cylinders The control of input oil or oil return can make the radial through hole open or be blocked to obtain different numbers of outlets.
- the ends of the piston rods of the two-stage telescopic hydraulic cylinders are brought to different positions to block the Or open a part or all of the radial holes, so as to realize the flow regulation function of the downhole flow control valve.
- one input port is reserved as the oil return port at the input port, and other input ports are selected as the pressurization port, and the pressure of the pressurization port is set to be the same or different as required; Before, the radial holes of the sliding sleeve are blocked first, and then the opening adjustment is performed.
- the invention adopts a simple one-way valve combination, utilizes the pressurization sequence of the hydraulic pipeline and the combination of high and low pressure to realize downhole layer selection and opening degree control, and has the advantages of simple scheme and simple opening degree control.
- Fig. 1 is a schematic diagram of an intelligent completion flow control decoder and a sliding sleeve according to an embodiment of the present invention
- Fig. 2 is a hydraulic schematic diagram of a horizon selection sub-section according to an embodiment of the present invention
- Fig. 3 is a hydraulic principle diagram of high and low pressure selection nipples according to an embodiment of the present invention.
- Fig. 4 is a schematic diagram of a downhole flow control sliding sleeve according to an embodiment of the present invention.
- Fig. 5 is a wiring diagram of a horizon selection nipple according to an embodiment of the present invention.
- Fig. 6 is an action diagram of downhole flow control sliding sleeve opening 1 according to an embodiment of the present invention.
- Fig. 7 is an action diagram of downhole flow control sliding sleeve opening 2 according to an embodiment of the present invention.
- Fig. 8 is an action diagram of the opening 3 of the downhole flow control sliding sleeve according to an embodiment of the present invention.
- Fig. 9 is an action diagram of the opening 4 of the downhole flow control sliding sleeve according to an embodiment of the present invention.
- different hydraulic pressurization sequences are set at the input port to activate the layer selection nipples of different layers, and by controlling the pressure value of the corresponding hydraulic pipeline, different high and low pressure combinations are input to change the corresponding layer high and low pressure.
- the direction of oil delivery and oil return at the outlet of the pup joint is selected, so that it is configured to control the different movements of the pistons in the corresponding layer sliding sleeves, and then realize the opening control of the corresponding layer sliding sleeves.
- the hydraulic system for layer selection and opening control of the downhole sliding sleeve of the present invention mainly includes:
- the layer selection pup joint includes a group of hydraulic input ports and a group of hydraulic output ports, and a first group of hydraulic control valves connected between the group of hydraulic input ports and a group of hydraulic output ports, configured to pass through the The group of hydraulic control valves controls the opening and closing of the group of hydraulic output ports;
- the high and low pressure selection pup joint includes a group of hydraulic connection ports, a group of high and low pressure output ports and oil return ports, and a second connection between the group of hydraulic connection ports and a group of high and low pressure output ports and oil return ports.
- a group of hydraulic control valves wherein the group of hydraulic connection ports are respectively connected to the group of hydraulic output ports in one-to-one correspondence, and are configured to pass through the input mode of the second group of hydraulic control valves and the layer selection sub-joint And the adjustment of pressurization controls the opening and closing of the set of high and low pressure output ports and the oil return port.
- the implementation of the present invention is to independently realize the control requirements of the four openings of the six-layer sliding sleeves in the downhole.
- a special pressurization sequence activate the horizon selection nipple of the corresponding horizon decoder, and control the pressure value of the corresponding hydraulic pipeline.
- carry out a specific combination of high and low pressure and change the oil inlet and oil return direction of the decoder outlet of the corresponding layer, so as to control the different movements of the two-stage pistons in the sliding sleeve of the corresponding layer, and then realize the four openings of the sliding sleeve of the corresponding layer.
- the sliding sleeve is connected to the oil pipe, the hydraulic oil controls the opening of the sliding sleeve, and the opening of the sliding sleeve controls the flow rate of oil production.
- the special pressurization sequence can sequentially open the corresponding layer hydraulic oil circuit, while other layers are not opened.
- Changing the pressure of the hydraulic control pipeline can connect the high and low pressure of the decoder to select the middle and high pressure or low pressure oil circuit of the puppet, so that the liquid flow direction of the inlet and outlet of the decoder can be changed, so as to realize the four openings of the sliding sleeve. Control the flow of each target layer.
- the three hydraulic pipelines are sequentially connected to six downhole hydraulic control systems from the ground hydraulic station to the bottom of the well, and at the same time, the three hydraulic pipelines are connected to the ground hydraulic control equipment. That is to say, the downhole hydraulic control systems of each layer are connected in parallel with three hydraulic pipelines.
- the first hydraulic input pipeline, the second hydraulic input pipeline and the third hydraulic input pipeline can all be stainless steel pipelines.
- Each downhole hydraulic control system includes layer selection nipples, five hydraulic connection pipelines between nipples, high and low pressure selection nipples and five hydraulic output pipelines.
- Five hydraulic output pipelines are connected to the sliding sleeve to control the opening of the sliding sleeve.
- the layer selection subsection and the high and low voltage selection subsection can be included in the decoder.
- the layer selection pup joint includes two normally open hydraulic control check valves, four normally closed hydraulic control check valves and three oil passages; the high and low pressure selection sub joint includes two normally open hydraulic control check valves, six Normally closed hydraulically controlled one-way valve, eight oil passages and one oil return passage.
- the layer selection pup joint and the high and low pressure selection pup joints are connected by five hydraulic connection pipelines.
- the high and low pressure selection nipples are connected with the downhole flow control sliding sleeve by five hydraulic output pipelines.
- the hydraulic control system has the functions of downhole layer selection and control of the opening of the downhole sliding sleeve. Three hydraulic pipelines can be used to control the opening of the six downhole sliding sleeves, so as to realize the control of the flow rate of each target layer.
- an embodiment of the present invention provides a hydraulic downhole intelligent flow control valve decoder control scheme, as shown in Figure 1, the decoder system includes a first hydraulic input pipeline 1, a second hydraulic input pipeline 2, a third Hydraulic input pipeline 3, layer selection nipple 4, first high pressure connecting pipeline 5, first low pressure connecting pipeline 6, second high pressure connecting pipeline 7, second low pressure connecting pipeline 8, first oil return connecting pipeline 9, high and low pressure Select the pup joint 10, the first high pressure output pipeline 11, the first low pressure output pipeline 12, the second high pressure output pipeline 13, the second low pressure output pipeline 14 and the first oil return output pipeline 15; decoder and downhole flow control sliding sleeve 16 Connected via five hydraulic output lines.
- the left end of the layer selection pup joint 4 is connected to three hydraulic input pipelines through three hydraulic input pipeline joints, and the three hydraulic input pipeline joints are respectively the first hydraulic input pipeline joint 41 and the second hydraulic input pipeline joint 42 And the third hydraulic input line joint 43.
- the right end of the layer selection pup joint 4 is connected to five hydraulic connection pipelines through five hydraulic connection pipeline joints.
- the five hydraulic connection pipeline joints are the first high pressure connection pipeline joint 44, the second high pressure connection pipeline joint 45, the first low pressure connection pipeline A pipeline joint 46 , a second low pressure connection pipeline joint 47 and a first oil return connection pipeline joint 48 .
- the first oil passage 49 , the second oil passage 50 and the third oil passage 51 are distributed in the horizon selection sub-joint 4 .
- the layer selection sub-section 4 also includes a first normally open hydraulically controlled check valve 17, a second normally open hydraulically controlled check valve 18, a first normally closed hydraulically controlled check valve 19, a second normally Closed hydraulic control check valve 20, the third normally closed hydraulic control check valve 21 and the fourth normally closed hydraulic control check valve 22;
- the first normally open hydraulic control check valve 17 has a first normally open oil inlet 23 at the left end and the first normally open control port 24, the right end of the first normally open hydraulic control check valve 17 has a first normally open oil outlet 25;
- the left end of the second normally open hydraulic control check valve 18 has a second normally open oil inlet 26 and the second normally open control port 27, the second normally open hydraulic control check valve 18 has a second normally open oil outlet 28 at the right end;
- the first normally closed hydraulic control check valve 19 has a first normally closed oil inlet 29 at the left end , the right end of the first normally closed hydraulically controlled check valve 19 has a first normally closed oil outlet 30 and a first normally closed control port 31;
- the first oil passage connects 49 to the first hydraulic input line connector 41, the second normally open oil inlet 26, the second normally open oil outlet 28, the second normally closed oil inlet 32, and the second normally closed oil outlet Port 33, the first normally open control port 24, the first high pressure connection pipeline joint 44 and the first low pressure connection pipeline joint 46;
- the second oil passage 50 is connected to the second hydraulic input pipeline joint 42, the first normally open oil inlet 23 , The first normally open oil outlet 25, the first normally closed oil inlet 29, the first normally closed oil outlet 30, the fourth normally closed oil inlet 38, the fourth normally closed oil outlet 39, the second normally open The control port 27, the second normally closed control port 34, the third normally closed control port 37, the second high pressure connection pipeline joint 45 and the second low pressure connection pipeline joint 47;
- the third oil passage 51 is connected to the third hydraulic input pipeline The joint 43 , the third normally closed oil inlet 35 , the third normally closed oil outlet 36 and the first oil return connection pipeline joint 48 .
- the first normally open hydraulic control check valve 17 includes a first normally open steel ball, a first normally open spring, a first normally open spring seat, a first normally open steel ball ejector rod, a first normally open oil inlet, The first normally open oil outlet and the first normally open control port; similarly, the second normally open hydraulic control check valve 18 includes the second normally open steel ball, the second normally open spring, the second normally open spring seat, the second normally open Two normally open steel ball ejector rods, the second normally open oil inlet, the second normally open oil outlet and the second normally open control port; the first normally closed hydraulic control check valve 19 includes the first normally closed steel ball, the second normally closed One normally closed spring, the first normally closed spring seat, the first normally closed steel ball ejector rod, the first normally closed oil inlet, the first normally closed oil outlet and the first normally closed control port; similarly, the second normally closed The hydraulic control check valve 20 includes a second normally closed steel ball, a second normally closed spring, a second normally closed spring seat, a second normally closed steel ball ejector
- the five hydraulic connection pipelines are used to connect with the five input ports of the subsequent high and low pressure selection nipples 10 .
- Stainless steel pipelines can be used for the first high pressure connecting pipeline, the second high pressure connecting pipeline, the first low pressure connecting pipeline, the second low pressure connecting pipeline and the first oil return connecting pipeline.
- the left end of the high and low pressure selection pup joint 10 is connected to five hydraulic connection pipelines through five hydraulic connection pipeline joints.
- the five hydraulic connection pipeline joints are the third high pressure connection pipeline joint 84, the fourth high pressure connection pipeline joint 85, and the third low pressure connection A pipeline connector 86 , a fourth low pressure connection pipeline connector 87 and a second oil return connection pipeline connector 88 .
- the right end of the high and low pressure selection pup joint 10 is connected to five hydraulic output pipelines through five hydraulic output pipeline joints.
- the five hydraulic output pipeline joints are: first high pressure output pipeline joint 89, second high pressure output pipeline joint 90, first low pressure output pipeline joint An output pipeline connector 91 , a second low pressure output pipeline connector 92 and a first oil return output pipeline connector 93 .
- the high and low pressure selection pup joint 10 includes a third normally open hydraulically controlled check valve 52, a fourth normally open hydraulically controlled check valve 53, a fifth normally closed hydraulically controlled check valve 54, a sixth normally closed Hydraulically controlled one-way valve 55, seventh normally closed hydraulically controlled one-way valve 56, eighth normally closed hydraulically controlled one-way valve 57, ninth normally closed hydraulically controlled one-way valve 58 and tenth normally closed hydraulically controlled one-way valve 59 .
- the left end of the third normally open hydraulic control check valve 52 has a third normally open oil inlet 60 and a third normally open control port 61, and the right end of the third normally open hydraulic control check valve 52 has a third normally open oil outlet 62;
- the left end of the fourth normally open hydraulic control check valve 53 has a fourth normally open oil inlet 63 and a fourth normally open control port 64, and the right end of the second normally open hydraulic control check valve 53 has a fourth normally open oil outlet 65;
- the high and low pressure selection pup joint 10 distributes the first high-pressure oil passage 94, the second high-pressure oil passage 95, the first low-pressure oil passage 96, the second low-pressure oil passage 97, the first high-pressure oil return passage 98, the second High pressure oil return channel 99 , first low pressure oil return channel 100 , second low pressure oil return channel 101 and first output oil return channel 102 .
- the first high-pressure oil passage 94 is connected to the third high-pressure connection pipeline joint 84, the eighth normally closed oil inlet 75, the eighth normally closed oil outlet 76, the eighth normally closed control port 77, the fourth normally open control port 64, The tenth normally closed control port 82 and the first high pressure output pipeline joint 89;
- the first low pressure oil passage 96 is connected to the third low pressure connection pipeline joint 86, the fourth normally open oil inlet 63, the fourth normally open oil outlet 65, The ninth normally closed control port 79 and the first low pressure output pipeline joint 91;
- the second high pressure oil passage 95 is connected to the fourth high pressure connection pipeline joint 85, the fifth normally closed oil inlet 66, the fifth normally closed oil outlet 67, The fifth normally closed control port 68, the third normally open control port 61, the seventh normally closed control port 73 and the second high pressure output pipeline joint 90;
- the second low pressure oil passage 97 is connected to the fourth low pressure connection pipeline joint 87, the third A normally open oil inlet 60 , a third normally open
- the third normally open hydraulic control check valve 52 includes a third normally open steel ball, a third normally open spring, a third normally open spring seat, a third normally open steel ball ejector rod, a third normally open oil inlet, The third normally open oil outlet and the third normally open control port; similarly, the fourth normally open hydraulic control check valve includes a fourth normally open steel ball, a fourth normally open spring, a fourth normally open spring seat, The fourth normally open steel ball ejector rod, the fourth normally open oil inlet, the fourth normally open oil outlet and the fourth normally open control port; the fifth normally closed hydraulic control check valve includes the fifth normally closed steel ball , the fifth normally closed spring, the fifth normally closed spring seat, the fifth normally closed steel ball ejector rod, the fifth normally closed oil inlet, the fifth normally closed oil outlet and the fifth normally closed control port; similarly, all The sixth normally closed hydraulic control check valve includes the sixth normally closed steel ball, the sixth normally closed spring, the sixth normally closed spring seat, the sixth normally closed steel ball ejector rod, the sixth normally closed oil inlet,
- Five hydraulic output pipelines are used to connect five input ports of the downhole flow control sliding sleeve 16 .
- Stainless steel pipelines can be used for the first high-pressure output pipeline, the second high-pressure output pipeline, the first low-pressure output pipeline, the second low-pressure output pipeline and the first oil return output pipeline.
- the downhole flow control sliding sleeve 16 includes a nested first single-stage hydraulic cylinder 103 and a second single-stage hydraulic cylinder 104;
- the first single-stage hydraulic cylinder 103 includes a left chamber 105 of the first single-stage hydraulic cylinder , the first single-stage hydraulic cylinder right chamber 106 and the first single-stage hydraulic cylinder piston 107;
- the second single-stage hydraulic cylinder 104 includes the second single-stage hydraulic cylinder left chamber 108, the second single-stage hydraulic cylinder middle chamber 109 , the second single-stage hydraulic cylinder right chamber 110 and the second single-stage hydraulic cylinder piston 111.
- Radial holes 113, radial holes 114 and radial holes 115 are distributed on the outer wall 112 of the downhole flow control sliding sleeve; there are five joints connected to the five hydraulic output pipelines on the downhole flow control sliding sleeve 16, and the joints include the first High-pressure sliding sleeve line joint 116, first low-pressure sliding sleeve line joint 117, second high-pressure sliding sleeve line joint 118, second low-pressure sliding sleeve line joint 119, and first oil return sliding sleeve line joint 120; first high-pressure sliding sleeve line joint 116 is connected with the right chamber 106 of the first single-stage hydraulic cylinder; the first low-pressure sliding sleeve line joint 117 is connected with the left chamber 105 of the first single-stage hydraulic cylinder; the second high-pressure sliding sleeve pipeline joint 118 is connected with the second single-stage The middle chamber 109 of the hydraulic cylinder is connected; the second low-pressure sliding sle
- one embodiment of the present invention provides a method for selecting downhole oil and gas production layers, which realizes that three hydraulic input pipelines control six downhole layers, and the connection sequence of each layer and the three hydraulic input pipelines is different, that is, each time Select one of the layers to control.
- the three hydraulic input pipelines any two of them can be used as pressure input pipelines, and the third can be used as oil return pipelines; the three pipelines can have six wiring combinations.
- the following steps may be included (the order of pressurization is adjustable):
- the pressurization sequence is to first pressurize the first hydraulic input pipeline 1, and then pressurize the second hydraulic input pipeline 2, then the fluid flow of the pup joint is selected for the first layer: pressurize the first hydraulic input pipeline 1 first, and then pressurize the second hydraulic input pipeline 2.
- the hydraulic oil on an oil passage 49 passes through the first hydraulic input pipeline joint 41, the second normally open oil inlet 26, the second normally open oil outlet 28, the first normally open control port 24 and the first normally closed control port 31 , close the first normally open hydraulic control check valve 17 and open the first normally closed hydraulic control check valve 19; then pressurize the second hydraulic input line 2, the hydraulic oil on the second oil passage 50 passes through the second hydraulic input The pipeline joint 42, the first normally closed oil inlet 29, the first normally closed oil outlet 30 and the second normally closed control port 34, open the second normally closed hydraulic control check valve 20; the hydraulic pressure on the first oil passage 49
- the oil enters the fourth normally closed control port 40, and the fourth normally closed hydraulic control check valve 22 is opened; the hydraulic oil on the second oil passage 50 enters the third normally closed control port 37, and the third normally closed hydraulic control check valve is opened 21; the first normally closed hydraulic control check valve 19, the second normally closed hydraulic control check valve 20, the third normally closed hydraulic control check valve 21 and the fourth normally closed hydraulic control check valve 22 are all opened, then The first layer horizon selection subsection
- the fluid flow condition of the sub-joint in the second layer first pressurize the first hydraulic input pipeline 1, the hydraulic oil on the second oil passage 50 passes through the second hydraulic input pipeline joint 42, the first normally open oil inlet 23, the second One normally open oil outlet 25, the second normally open control port 27 and the first normally closed oil inlet 29, close the second normally open hydraulic control check valve 18; then pressurize the second hydraulic input pipeline 2, the first The hydraulic oil on the oil passage 49 passes through the first hydraulic input pipeline joint 41 and the second normally closed oil inlet 26; the first normally closed hydraulic control check valve 19 and the second normally open hydraulic control check valve 18 are both closed , the second layer horizon selection subsection is not activated.
- the fluid flow conditions of the third layer selection pup joint pressurize the first hydraulic input pipeline 1 first, the hydraulic oil on the second oil passage 50 passes through the second hydraulic input pipeline joint 42, the first normally open oil inlet 23, the second One normally open oil outlet 25, the second normally open control port 27 and the first normally closed oil inlet 29, close the second normally open hydraulic control check valve 18; then pressurize the second hydraulic input pipeline 2, the third The hydraulic oil on the oil passage 51 passes through the third hydraulic input pipeline joint 43 and the third normally closed oil inlet 35; the first normally closed hydraulic control check valve 19, the second normally closed hydraulic control check valve 20 and the third normally closed hydraulic control check valve If the hydraulic control check valves 21 are all closed, the level selection nipple of the third layer is not activated;
- the fluid flow situation of the fourth layer selection pup joint first pressurize the first hydraulic input pipeline 1, the hydraulic oil on the first oil passage 49 passes through the first hydraulic input pipeline joint 41, the second normally open oil inlet 26, the second Two normally open oil outlets 28, the first normally open control port 24 and the first normally closed control port 31, close the first normally open hydraulic control check valve 17 and open the first normally closed hydraulic control check valve 19; and then Pressurize the second hydraulic input pipeline 2, the hydraulic oil on the third oil passage 51 passes through the third hydraulic input pipeline joint 43 and the third normally closed oil inlet 35; the second normally closed hydraulic control check valve 20, the third normally closed If both the closed hydraulic control check valve 21 and the fourth normally closed hydraulic control check valve 22 are in the closed state, then the level selection sub-joint of the fourth layer is not activated.
- the fluid flow conditions of the fifth layer selection pup joint first pressurize the first hydraulic input pipeline 1, the hydraulic oil on the third oil passage 51 passes through the third hydraulic input pipeline joint 43 and the third normally closed oil inlet 35; then Repressurize the second hydraulic input pipeline 2, the hydraulic oil on the first oil passage 49 passes through the first hydraulic input pipeline joint 41, the second normally open oil inlet 26, the second normally open oil outlet 28, the first normally open
- the control port 24 and the first normally closed control port 31 close the first normally open hydraulically controlled check valve 17 and open the first normally closed hydraulically controlled check valve 19; the second normally closed hydraulically controlled check valve 20 and the third normally closed hydraulically controlled check valve Closed hydraulically controlled check valve 21 and fourth normally closed hydraulically controlled check valve 22 are both closed, then the fifth floor level selection nipple is not activated;
- the liquid flow condition of the sixth layer selection pup joint first pressurize the first hydraulic input pipeline 1, the hydraulic oil on the third oil passage 51 passes through the third hydraulic input pipeline joint 43 and the third normally closed oil inlet 35; then Repressurize the second hydraulic input pipeline 2, the hydraulic oil on the second oil passage 50 passes through the second hydraulic input pipeline joint 42, the first normally open oil inlet 23, the first normally open oil outlet 25, the second normally open The control port 27 and the first normally closed oil inlet 29 close the second normally open hydraulic control check valve 18; the first normally closed hydraulic control check valve 19, the second normally closed hydraulic control check valve 20, and the third normally closed hydraulic control check valve If both the closed hydraulic control check valve 21 and the fourth normally closed hydraulic control check valve 22 are in the closed state, then the sixth layer level selection sub-joint is not activated.
- the pressurization sequence is to first pressurize the second hydraulic input pipeline 2, and then pressurize the first hydraulic input pipeline 1, then the second layer level selection nipple is activated, and the first layer, the third layer, the second layer Layer 4, 5, and 6 horizon selection subsections are not activated.
- the pressurization sequence is to first pressurize the third hydraulic input pipeline 3, and then pressurize the first hydraulic input pipeline 1, then the third layer level selection nipple is activated, and the first layer, the second layer, the second layer Layer 4, 5, and 6 horizon selection subsections are not activated.
- the pressurization sequence is to first pressurize the first hydraulic input pipeline 1, and then pressurize the third hydraulic input pipeline 3, then the fourth layer level selection nipple is activated, and the first layer, the second layer, the second layer Layer 3, Layer 5, and Layer 6 horizon selection subsections are not activated.
- the pressurization sequence is to first pressurize the second hydraulic input pipeline 2, and then pressurize the third hydraulic input pipeline 3, then the fifth layer level selection nipple is activated, the first layer, the second layer, the second layer Layer 3, Layer 4, and Layer 6 horizon selection sub-sections are not activated.
- the pressurization sequence is to first pressurize the third hydraulic input pipeline 3, and then pressurize the second hydraulic input pipeline 2, then the sixth layer level selection nipple is activated, and the first layer, the second layer, the second layer Layer 3, Layer 4, and Layer 5 horizon selection subs do not start.
- the embodiment of the present invention provides a downhole hydraulic control high and low pressure selection method to realize four opening degrees of the sliding sleeve in the target layer, thereby controlling the flow rate of the target layer, for example,
- the opening pressure of the fifth and eighth normally closed hydraulic control check valves can be high pressure (for example, 10MPa), and the third and fourth normally open
- the closing pressure of the hydraulic control check valve is low pressure (for example, 5MPa), which can make the opening pressure of the sixth, seventh, ninth and tenth normally closed hydraulic control check valves be low pressure (for example, less than 5MPa); adjust the layer selection pup joint
- the structure and spring of each hydraulically controlled check valve can make the opening and closing pressure of each hydraulically controlled check valve be low pressure (for example, less than 5MPa); more specifically, the following steps can be included (pressing sequence can be adjusted as required):
- the three high-pressure connecting pipeline joints 84 flow into the first high-pressure oil passage 94; the high-pressure hydraulic oil on the first high-pressure oil passage 94 passes through the eighth normally closed oil inlet 75, the eighth normally closed control port 77, and the eighth normally closed outlet.
- the hydraulic input pipeline 3 flows back to the oil tank; the opening degree of the downhole flow control sliding sleeve 16 is 3, as shown in FIG. 8 .
- the high-pressure hydraulic oil on the first high-pressure oil passage 94 passes through the eighth normally closed oil inlet 75, the eighth normally closed control port 77, the eighth normally closed oil outlet 76, the fourth normally open control port 64,
- the tenth normally closed control port 81, the first high pressure output pipeline connector 89, the first high pressure output pipeline 11 and the first high pressure sliding sleeve pipeline connector 116 close the fourth normally open hydraulic control check valve 53 and open the tenth normally closed fluid Control the check valve 59;
- the high-pressure hydraulic oil flows into the right chamber 106 of the first single-stage hydraulic cylinder, the piston 107 of the first single-stage hydraulic cylinder returns to the left limit position to the left, and the hydraulic oil through the left chamber 105 of the first single-stage hydraulic cylinder
- the third normally closed oil outlet 36, the third normally closed oil inlet 35, the third hydraulic input pipeline joint 43 and the third hydraulic input pipeline 3 in the open state flow back to the oil tank;
- the opening of the downhole flow control sliding sleeve 16 is the opening degree 4 (fully open), as shown in Figure 9.
- each of the six layers of decoders in the downhole can be opened independently, so as to control the flow of the target oil and gas layer to control the action of the sliding sleeve.
- Different pressure combinations of two pressure input pipelines can be selected, namely low pressure-low pressure, low pressure-high pressure, high pressure-low pressure and high pressure-high pressure control, to realize different movement forms of the first and second single-stage hydraulic cylinder pistons, so that flow control
- the sliding sleeve has four different openings, so as to realize the flow control of the target oil and gas layer.
- the invention can realize the flow control of the downhole target layer without using downhole electronic equipment.
- the term "comprises”, “comprises” or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase “comprising a " does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.
- connection should be understood in a broad sense, for example, it can be a fixed connection or a A detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be an internal communication between two components.
- installation should be understood in a broad sense, for example, it can be a fixed connection or a A detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be an internal communication between two components.
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Abstract
一种井下滑套层位选择和开度控制的液压系统，包括：层位选择短节（4），其包括一组液压输入口和一组液压输出口，及位于一组液压输入口和一组液压输出口之间连接的第一组液控阀，被配置为通过液控阀控制液压输出口的开闭；高低压选择短节（10），包括一组液压连接口和一组高低压输出口及回油口，及位于一组液压连接口和一组高低压输出口及回油口之间连接的第二组液控阀，其中一组液压连接口分别与一组液压输出口一一对应连接，被配置为通过第二组液控阀及层位选择短节（4）的输入方式及加压的调整控制高低压输出口及回油口的开闭。该系统可实现井下层位选择和开度控制，具有方案简单，开度控制简单等优点。还公开了一种井下滑套层位选择和开度控制的液压系统的使用方法。
Description
本发明涉及油气开采技术领域，具体涉及一种井下滑套层位选择和开度控制的液压系统及其方法。
油气生产中，油气井可能穿过地下多个油气层，需要对每个油气层的生产进行单独管理，以提高生产效率。井下流量控制阀是控制各产层流入的关键控制装置，通过使用流量控制阀的节流功能可以关闭、开启或节流一个或多个产层，实现对不同产层或者分支流量的单独控制。流量控制阀可实时调整产层间的压力、流体流速、井筒流入动态，实现多层合采混采，实现油藏的实时控制与优化开采、控制水锥气侵、加速生产、提高采收率。
井下每个产层需安装一套流量控制阀，通常全液压控制式流量控制阀包括层位选择和开度控制两部分。层位选择确定井下目的层，选定目的层后再对目标层进行开度控制，从而控制目的层的井下流量，而其他层位的滑套不执行任何操作。利用电控的方式来确定井下层位是简单可行的，但目前电子元器件的寿命在井下高温高压的情况下会大大缩短。也有一些液压控制方式的提出，但系统较为复杂，成本高。
因此，如何能采用较为简单、低成本的对油气层的生产进行有效控制，是本领域的一个研究方向。
有鉴于此，本发明旨在提供一种井下滑套层位选择和开度控制的液压系统及其方法，以能够简单方便地实现对油气层的生产控制。
本发明一种井下滑套层位选择和开度控制的液压系统，其特征在于，所述系统包括：
层位选择短节，包括一组液压输入口和一组液压输出口，及位于所述一组液压输入口和一组液压输出口之间连接的第一组液控阀，被配置为通过所述一组液控阀控制所述一组液压输出口的开闭；
高低压选择短节，包括一组液压连接口和一组高低压输出口及回油口，及位于所述一组液压连接口和一组高低压输出口及回油口之间连接的第二组液控阀，其中所述一组液压连接口分别与所述一组液压输出口一一对应连接，被配置为通过所述第二组液控阀及所述层位选择短节的输入方式及加压的调整控制所述一组高低压输出口及回油口的开闭。
根据本发明的一种实施方式，所述系统包括多层控制系统，每层控制系统包括相连接的所述层位选择短节和高低压选择短节，多层控制系统为并联连接。
根据本发明的一种实施方式，所述系统包括六层控制系统，所述一组液压输入口的数量为三个。
根据本发明的一种实施方式，所述层位选择短节还包括三个过油孔道，所述第一组液控阀包括两个常开液控单向阀、四个常闭液控单向阀，所述三个过油孔道的两端分别设有对应的所述液压输入口和液压输出口，其中，第一过油孔道上依次设置一常开液控单向阀和一常闭液控单向阀，第二过油孔道上依次设置两个常闭液控单向阀，第三过油孔道上设置一个常闭液控单向阀，自第二过油孔道的输入口引出一常开液控单向阀与所述第一过油孔道上的常开液控单向阀相互联控，其他常闭液控单向阀之间两两联控，最终引出五个液压输出口。
根据本发明的一种实施方式，所述高低压选择短节还包括一个输出回油孔道和另外八个过油孔道，所述第二组液控阀包括两个常开液控单向阀和六个常闭液控单向阀，每个过油孔道上设置一个单向阀，四个过油孔道为一组，共形成两组对称并联的油路，每组中，其中两个过油孔道上设有流向相同的常开液控单向阀和常闭液控单向阀，另外两个过油孔道上设有与所述其中两个过油孔道流向不同的常闭液控单向阀，该组中两两进行联控设置；所述输出回油孔道与所述两组油路并联设置。
根据本发明的一种实施方式，所述系统还包括滑套，所述滑套包括壁内的两级伸缩液缸和分布于壁上连通内外的径向孔，所述两级伸缩液缸包括第一单级液缸和第二单级液缸；所述第一单级液缸包括第一单级液缸左腔室、第一单级液缸右腔室和第一单级液缸活塞；所述第二单级液缸包括第二单级液缸左腔室、第二单级液缸中间腔室、第二单级液缸右腔室和第二单级液缸活塞；所述第二单级液缸的缸体部分与所述第一单级液缸的活塞杆部分连接；所述径向孔为井下产层油气流动通道；所述高低压选择短节的输出口一一对应分别连接所述滑套的各个腔室。
本发明还提出一种根据所述的井下滑套层位选择和开度控制的液压系统的使用方法，所述方法包括：
通过在输入口设置不同的液压加压次序，以激活不同层位的层位选择短节，通过控制相应液压管线的压力值，进行不同高低压组合的输入，以改变相应层位高低压选择短节出口输油和回油方向，从而被配置为控制相应层位滑套中活塞不同的动作，进而实现相应层位滑套的开度控制。
根据本发明的一种实施方式，所述高低压选择短节的输出口连接两级液压伸缩滑套的活塞缸，所述滑套设有一组不同位置的径向通孔，通过对不同活塞缸的输入油或回油控制能够使得所述径向通孔打开或被封堵，得到不同的流出口数量。
根据本发明的一种实施方式，当所述第一单级液缸活塞和第二单级液缸活塞处于不同位置，两级伸缩液缸的活塞杆端部被带至不同位置，以封堵或打开所述径向孔中的一部分或全部，从而实现井下流量控制阀的流量调节功能。
根据本发明的一种实施方式，加压时在输入口留一个输入口作为回油口，选择其他输入口作为加压口，加压口的压力根据需要设置为相同或不同；每次加压前，均先将滑套的径向孔均封堵，再进行开度的调整动作。
本发明采用简单的单向阀组合，利用液压管线的加压次序及高低压组合可实现井下层位选择和开度控制，具有方案简单，开度控制简单等优点。
图1为本发明一实施例智能完井流量控制解码器及滑套原理图；
图2为本发明一实施例层位选择短节液压原理图；
图3为本发明一实施例高低压选择短节液压原理图；
图4为本发明一实施例井下流量控制滑套原理图；
图5为本发明一实施例层位选择短节接线图；
图6为本发明一实施例井下流量控制滑套开度1动作图；
图7为本发明一实施例井下流量控制滑套开度2动作图；
图8为本发明一实施例井下流量控制滑套开度3动作图；
图9为本发明一实施例井下流量控制滑套开度4动作图。
以下将结合附图对本发明的较佳实施例进行详细说明，以便更清楚理解本发明的目的、特点和优点。应理解的是，附图所示的实施例并不是对本发明范围的限制，而只是为了说明本发明技术方案的实质精神。
本发明通过在输入口设置不同的液压加压次序，以激活不同层位的层位选择短节，通过控制相应液压管线的压力值，进行不同高低压组合的输入，以改变相应层位高低压选择短节出口输油和回油方向，从而被配置为控制相应层位滑套中活塞不同的动作，进而实现相应层位滑套的开度控制。
本发明的井下滑套层位选择和开度控制的液压系统主要包括：
层位选择短节，包括一组液压输入口和一组液压输出口，及位于所述一组液压输入口和一组液压输出口之间连接的第一组液控阀，被配置为通过所述一组液控阀控制所述一组液压输出口的开闭；
高低压选择短节，包括一组液压连接口和一组高低压输出口及回油口，及位于所述一组液压连接口和一组高低压输出口及回油口之间连接的第二组液控阀，其中所述一组液压连接口分别与所述一组液压输出口一一对应连接，被配置为通过所述第二组液控阀及所述层位选择短节的输入方式及加压的调整控制所述一组高低压输出口及回油口的开闭。
下面以三条输入液压管线为控制系统输入，进行六层流量控制的实施方式说明。但可不局限于该数量的输入与层数及开度控制。
本发明实施方式要独立实现井下六层滑套各自的四个开度的控制要求，通过特殊的加压次序，激活相应层位解码器的层位选择短节，通过控制相应液压管线的压力值，进行特定高低压组合，改变相应层位解码器出口进油和回油方向，从而控制相应层位滑套中两级活塞不同的动作，进而实现相应层位滑套的四个开度。滑套连在油管上，液压油控制滑套的开度大小，滑套的开度又控制采油的流量大小。
特殊的加压次序可以依次开启相应层位液压油路，而其他层位不被开启。改变液压控制管线压力的高低，可连通解码器中高低压选择短节中高压或低压油路，就能够改变解码器进出油口的液流方向，从而实现滑套的四个开度，即可实现对各目标层位流量的控制。
根据本发明的一种实施方式，三条液压管线由地面液压站向井底方向依次连接6个井下液压控制系统，同时三条液压管线连接着地面液压控制设备。也就是说，各层井下液压控制系统并联连接后与三条液压管线。所述第一液压输入管线、第二液压输入管线和第三液压输入管线均可采用不锈钢管线。
每个井下液压控制系统包括层位选择短节、五根短节间液压连接管线、高低压选择短节和五根液压输出管线。五根液压输出管线连接滑套，对滑套的开度进行控制。其中层位选择短节和高低压选择短节均可被包含在解码器里。
层位选择短节包括两个常开液控单向阀、四个常闭液控单向阀和三个过油孔道；高低压选择短节包括两个常开液控单向阀、六个常闭液控单向阀和八个过油孔道及一个回油孔道。层位选择短节与高低压选择短节由五根液压连接管线连接。高低压选择短节与井下流量控制滑套由五根液压输出管线连接。该液压控制系统具有井下选层和控制井下滑套开度的功能，可利用三根液压管线控制井下六层滑套各自的开度，从而实现对各目标层位流量的控制。
如要每次进行其中一层的流量控制，对其他层不控制，可将各层的层位选择短节的三个输入口对应连接不同顺序的三条液压管线，也就是三条液压管线按照连接顺序不同可以有六种组合，如图5所示；而如果要对其中几层进行相同的控制，则可以将该几层的连接顺序设为相同，而与其他层的连接顺序不同，就可以对其中几层进行相同的操作。
具体地，本发明一实施方式提供一种液压式井下智能流量控制阀解码器控制方案，如图1所示，该解码器系统包括第一液压输入管线1、第二液压输入管线2、第三液压输入管线3、 层位选择短节4、第一高压连接管线5、第一低压连接管线6、第二高压连接管线7、第二低压连接管线8、第一回油连接管线9、高低压选择短节10、第一高压输出管线11、第一低压输出管线12、第二高压输出管线13、第二低压输出管线14和第一回油输出管线15；解码器与井下流量控制滑套16经五根液压输出管线连接。
如图2所示，层位选择短节4左端通过三个液压输入管线接头与三根液压输入管线相连，三个液压输入管线接头分别为第一液压输入管线接头41、第二液压输入管线接头42和第三液压输入管线接头43。层位选择短节4右端通过五个液压连接管线接头与五根液压连接管线相连，五个液压连接管线接头分别为第一高压连接管线接头44、第二高压连接管线接头45、第一低压连接管线接头46、第二低压连接管线接头47和第一回油连接管线接头48。层位选择短节4内分布第一过油孔道49、第二过油孔道50和第三过油孔道51。
如图2所示，层位选择短节4还包括第一常开液控单向阀17、第二常开液控单向阀18、第一常闭液控单向阀19、第二常闭液控单向阀20、第三常闭液控单向阀21和第四常闭液控单向阀22；第一常开液控单向阀17左端有第一常开进油口23和第一常开控制口24，第一常开液控单向阀17右端有第一常开出油口25；第二常开液控单向阀18左端有第二常开进油口26和第二常开控制口27，第二常开液控单向阀18右端有第二常开出油口28；第一常闭液控单向阀19左端有第一常闭进油口29，第一常闭液控单向阀19右端有第一常闭出油口30和第一常闭控制口31；第二常闭液控单向阀20左端有第二常闭进油口32，第二常闭液控单向阀20右端有第二常闭出油口33和第二常闭控制口34；第三常闭液控单向阀21左端有第三常闭进油口35，第三常闭液控单向阀21右端有第三常闭出油口36和第三常闭控制口37；第四常闭液控单向阀22左端有第四常闭进油口38，第四常闭液控单向阀22右端有第四常闭出油口39和第四常闭控制口40。
第一过油孔道连49接第一液压输入管线接41头、第二常开进油口26、第二常开出油口28、第二常闭进油口32、第二常闭出油口33、第一常开控制口24、第一高压连接管线接头44和第一低压连接管线接头46；第二过油孔道50连接第二液压输入管线接头42、第一常开进油口23、第一常开出油口25、第一常闭进油口29、第一常闭出油口30、第四常闭进油口38、第四常闭出油口39、第二常开控制口27、第二常闭控制口34、第三常闭控制口37、第二高压连接管线接头45和第二低压连接管线接头47；第三过油孔道51连接所述第三液压输入管线接头43、第三常闭进油口35、第三常闭出油口36和第一回油连接管线接头48。
进一步，第一常开液控单向阀17包括第一常开钢球、第一常开弹簧、第一常开弹簧座、第一常开钢球顶杆、第一常开进油口、第一常开出油口和第一常开控制口；同理，第二常开液控单向阀18包括第二常开钢球、第二常开弹簧、第二常开弹簧座、第二常开钢球顶杆、第二常开进油口、第二常开出油口和第二常开控制口；第一常闭液控单向阀19包括第一常闭钢球、第一常闭弹簧、第一常闭弹簧座、第一常闭钢球顶杆、第一常闭进油口、第一常闭出油口和第一常闭控制口；同理，第二常闭液控单向阀20包括第二常闭钢球、第二常闭弹簧、第二常闭弹簧座、第二常闭钢球顶杆、第二常闭进油口、第二常闭出油口和第二常闭控制口；第三常闭液控单向阀21包括第三常闭钢球、第三常闭弹簧、第三常闭弹簧座、第三常闭钢球顶杆、第三常闭进油口、第三常闭出油口和第三常闭控制口；第四常闭液控单向阀22包括第四常闭钢球、第四常闭弹簧、第四常闭弹簧座、第四常闭钢球顶杆、第四常闭进油口、第四常闭出油口和第四常闭控制口。液控单向阀结构为现有技术，此处不再赘述。
其中，五根液压连接管线为了与后续的高低压选择短节10的五个输入口连接。
第一高压连接管线、第二高压连接管线、第一低压连接管线、第二低压连接管线和第一回油连接管线均可采用不锈钢管线。
高低压选择短节10左端通过五个液压连接管线接头与五根液压连接管线相连，五个液 压连接管线接头分别为第三高压连接管线接头84、第四高压连接管线接头85、第三低压连接管线接头86、第四低压连接管线接头87和第二回油连接管线接头88。
高低压选择短节10右端通过五个液压输出管线接头与五根液压输出管线相连，五个液压输出管线接头分别为：第一高压输出管线接头89、第二高压输出管线接头90、第一低压输出管线接头91、第二低压输出管线接头92和第一回油输出管线接头93。
如图3所示，高低压选择短节10包括第三常开液控单向阀52、第四常开液控单向阀53、第五常闭液控单向阀54、第六常闭液控单向阀55、第七常闭液控单向阀56、第八常闭液控单向阀57、第九常闭液控单向阀58和第十常闭液控单向阀59。
第三常开液控单向阀52左端有第三常开进油口60和第三常开控制口61，第三常开液控单向阀52右端有第三常开出油口62；第四常开液控单向阀53左端有第四常开进油口63和第四常开控制口64，第二常开液控单向阀53右端有第四常开出油口65；第五常闭液控单向阀54左端有第五常闭进油口66，第五常闭液控单向阀54右端有第五常闭出油口67和第五常闭控制口68；第六常闭液控单向阀55左端有第六常闭出油口69和第六常闭控制口70，第六常闭液控单向阀55右端有第六常闭进油口71；第七常闭液控单向阀56左端有第七常闭出油口72和第七常闭控制口73，第七常闭液控单向阀56右端有第七常闭进油口74；第八常闭液控单向阀57左端有第八常闭进油口75，第八常闭液控单向阀57右端有第八常闭出油口76和第八常闭控制口77；第九常闭液控单向阀58左端有第九常闭出油口78和第九常闭控制口79，第九常闭液控单向阀58右端有第九常闭进油口80；第十常闭液控单向阀59左端有第十常闭出油口81和第十常闭控制口82，第十常闭液控单向阀59右端有第十常闭进油口83。
高低压选择短节10内分布第一高压过油孔道94、第二高压过油孔道95、第一低压过油孔道96、第二低压过油孔道97、第一高压回油孔道98、第二高压回油孔道99、第一低压回油孔道100、第二低压回油孔道101和第一输出回油孔道102。
第一高压过油孔道94连接第三高压连接管线接头84、第八常闭进油口75、第八常闭出油口76、第八常闭控制口77、第四常开控制口64、第十常闭控制口82和第一高压输出管线接头89；第一低压过油孔道96连接第三低压连接管线接头86、第四常开进油口63、第四常开出油口65、第九常闭控制口79和第一低压输出管线接头91；第二高压过油孔道95连接第四高压连接管线接头85、第五常闭进油口66、第五常闭出油口67、第五常闭控制口68、第三常开控制口61、第七常闭控制口73和第二高压输出管线接头90；第二低压过油孔道97连接第四低压连接管线接头87、第三常开进油口60、第三常开出油口62、第六常闭控制口70和第二低压输出管线接头92。
进一步，第三常开液控单向阀52包括第三常开钢球、第三常开弹簧、第三常开弹簧座、第三常开钢球顶杆、第三常开进油口、第三常开出油口和第三常开控制口；同理，所述第四常开液控单向阀包括第四常开钢球、第四常开弹簧、第四常开弹簧座、第四常开钢球顶杆、第四常开进油口、第四常开出油口和第四常开控制口；所述第五常闭液控单向阀包括第五常闭钢球、第五常闭弹簧、第五常闭弹簧座、第五常闭钢球顶杆、第五常闭进油口、第五常闭出油口和第五常闭控制口；同理，所述第六常闭液控单向阀包括第六常闭钢球、第六常闭弹簧、第六常闭弹簧座、第六常闭钢球顶杆、第六常闭进油口、第六常闭出油口和第六常闭控制口；所述第七常闭液控单向阀包括第七常闭钢球、第七常闭弹簧、第七常闭弹簧座、第七常闭钢球顶杆、第七常闭进油口、第七常闭出油口和第七常闭控制口；所述第八常闭液控单向阀包括第八常闭钢球、第八常闭弹簧、第八常闭弹簧座、第八常闭钢球顶杆、第八常闭进油口、第八常闭出油口和第八常闭控制口；所述第九常闭液控单向阀包括第九常闭钢球、第九常闭弹簧、第九常闭弹簧座、第九常闭钢球顶杆、第九常闭进油口、第九常闭出油口和第九常闭控制口；所述第十常闭液控单向阀包括第十常闭钢球、第十常闭弹簧、第十常闭弹簧 座、第十常闭钢球顶杆、第十常闭进油口、第十常闭出油口和第十常闭控制口。液控单向阀结构为现有技术，此处不再赘述。
五根液压输出管线用于连接井下流量控制滑套16的五个输入口。
第一高压输出管线、第二高压输出管线、第一低压输出管线、第二低压输出管线和第一回油输出管线均可采用不锈钢管线。
如图4所示，井下流量控制滑套16包括嵌套的第一单级液缸103和第二单级液缸104；第一单级液缸103包括第一单级液缸左腔室105、第一单级液缸右腔室106和第一单级液缸活塞107；第二单级液缸104包括第二单级液缸左腔室108、第二单级液缸中间腔室109、第二单级液缸右腔室110和第二单级液缸活塞111。
井下流量控制滑套外壁112上分布径向孔113、径向孔114和径向孔115；井下流量控制滑套16上有五个与所述五根液压输出管线相连的接头，接头包括第一高压滑套管线接头116、第一低压滑套管线接头117、第二高压滑套管线接头118、第二低压滑套管线接头119和第一回油滑套管线接头120；第一高压滑套管线接头116与第一单级液缸右腔室106相连；第一低压滑套管线接头117与所述第一单级液缸左腔室105相连；第二高压滑套管线接头118与第二单级液缸中间腔室109相连；第二低压滑套管线接头119与第二单级液缸左腔室108相连；第一回油滑套管线接头120与第二单级液缸右腔室110相连。
如图2和图5所示，本发明一实施方式提供一种井下油气生产层位选择方法，实现三根液压输入管线控制井下六层，各层与三根液压输入管线的连接顺序不同，即每次选择其中一层进行控制。三根液压输入管线中，其中任意两根可作为压力输入管线，第三根可作为回油管线；三根管线可有六种接线组合。具体地，可包括以下步骤(加压顺序可调)：
1)加压顺序为先加压第一液压输入管线1，再加压第二液压输入管线2，则第一层层位选择短节液流情况：先加压第一液压输入管线1，第一过油孔道49上液压油通过第一液压输入管线接头41、第二常开进油口26、第二常开出油口28、第一常开控制口24和第一常闭控制口31，关闭第一常开液控单向阀17和打开第一常闭液控单向阀19；然后再加压第二液压输入管线2，第二过油孔道50上液压油通过第二液压输入管线接头42、第一常闭进油口29、第一常闭出油口30和第二常闭控制口34，打开第二常闭液控单向阀20；第一过油孔道49上液压油进入第四常闭控制口40，打开第四常闭液控单向阀22；第二过油孔道50上液压油进入第三常闭控制口37，打开第三常闭液控单向阀21；第一常闭液控单向阀19、第二常闭液控单向阀20、第三常闭液控单向阀21和第四常闭液控单向阀22均被打开，则第一层层位选择短节被启动。
第二层层位选择短节液流情况：先加压第一液压输入管线1，第二过油孔道50上液压油通过第二液压输入管线接头42、第一常开进油口23、第一常开出油口25、第二常开控制口27和第一常闭进油口29，关闭第二常开液控单向阀18；然后再加压第二液压输入管线2，第一过油孔道49上液压油通过第一液压输入管线接头41和第二常闭进油口26；第一常闭液控单向阀19和第二常开液控单向阀18均为关闭状态，则第二层层位选择短节未启动。
第三层层位选择短节液流情况：先加压第一液压输入管线1，第二过油孔道50上液压油通过第二液压输入管线接头42、第一常开进油口23、第一常开出油口25、第二常开控制口27和第一常闭进油口29，关闭第二常开液控单向阀18；然后再加压第二液压输入管线2，第三过油孔道51上液压油通过第三液压输入管线接头43和第三常闭进油口35；第一常闭液控单向阀19、第二常闭液控单向阀20和第三常闭液控单向阀21均为关闭状态，则第三层层位选择短节未启动；
第四层层位选择短节液流情况：先加压第一液压输入管线1，第一过油孔道49上液压油通过第一液压输入管线接头41、第二常开进油口26、第二常开出油口28、第一常开控制口24和第一常闭控制口31，关闭第一常开液控单向阀17和打开第一常闭液控单向阀19； 然后再加压第二液压输入管线2，第三过油孔道51上液压油通过第三液压输入管线接头43和第三常闭进油口35；第二常闭液控单向阀20、第三常闭液控单向阀21和第四常闭液控单向阀22均为关闭状态，则第四层层位选择短节未启动。
第五层层位选择短节液流情况：先加压第一液压输入管线1，第三过油孔道51上液压油通过第三液压输入管线接头43和第三常闭进油口35；然后再加压第二液压输入管线2，第一过油孔道49上液压油通过第一液压输入管线接头41、第二常开进油口26、第二常开出油口28、第一常开控制口24和第一常闭控制口31，关闭第一常开液控单向阀17和打开第一常闭液控单向阀19；第二常闭液控单向阀20、第三常闭液控单向阀21和第四常闭液控单向阀22均为关闭状态，则第五层层位选择短节未启动；
第六层层位选择短节液流情况：先加压第一液压输入管线1，第三过油孔道51上液压油通过第三液压输入管线接头43和第三常闭进油口35；然后再加压第二液压输入管线2，第二过油孔道50上液压油通过第二液压输入管线接头42、第一常开进油口23、第一常开出油口25、第二常开控制口27和第一常闭进油口29，关闭第二常开液控单向阀18；第一常闭液控单向阀19、第二常闭液控单向阀20、第三常闭液控单向阀21和第四常闭液控单向阀22均为关闭状态，则第六层层位选择短节未启动。
2)同理，加压顺序为先加压第二液压输入管线2，再加压第一液压输入管线1，则第二层层位选择短节被启动，第一层、第三层、第四层、第五层和第六层层位选择短节未启动。
3)同理，加压顺序为先加压第三液压输入管线3，再加压第一液压输入管线1，则第三层层位选择短节被启动，第一层、第二层、第四层、第五层和第六层层位选择短节未启动。
4)同理，加压顺序为先加压第一液压输入管线1，再加压第三液压输入管线3，则第四层层位选择短节被启动，第一层、第二层、第三层、第五层和第六层层位选择短节未启动。
5)同理，加压顺序为先加压第二液压输入管线2，再加压第三液压输入管线3，则第五层层位选择短节被启动，第一层、第二层、第三层、第四层和第六层层位选择短节未启动。
6)同理，加压顺序为先加压第三液压输入管线3，再加压第二液压输入管线2，则第六层层位选择短节被启动，第一层、第二层、第三层、第四层和第五层层位选择短节未启动。
如图1-图4和图6-图9所示，本发明实施方式提供一种井下液控高低压选择方法，实现目标层滑套四种开度，从而控制目标层的流量，具体比如可通过调整高低压选择短节各液控单向阀的结构和弹簧，可使第五和第八常闭液控单向阀开启压力为高压(例如10MPa)，可使第三和第四常开液控单向阀关闭压力为低压(例如5MPa)，可使第六、第七、第九和第十常闭液控单向阀开启压力为低压(例如小于5MPa)；调整层位选择短节各液控单向阀的结构和弹簧，可使各液控单向阀的开启和关闭压力均为低压(例如小于5MPa)；更具体地，可包括以下步骤(打压顺序可根据需要调整)：
1)每次加压前，无论井下流量控制滑套16处于何种状态，均先将液缸内活塞运动至如图6所示的开度1(全关)：图6中第一单级液缸活塞107处于右极限位置，第二单级液缸活塞111处于右极限位置，井下流量控制滑套外壁112上径向孔113、114和115均关闭。
2)先对第一液压输入管线1打低压，再对第二输入液压管线2打低压；液压油经过目标层层位选择短节4后，通过目标层高低压选择短节10的第三低压连接管线接头86和第四低压连接管线接头87流入第一低压过油孔道96和第二低压过油孔道97；第一低压过油孔道96上的低压液压油经过第四常开进油口63、第四常开出油口65、第九常闭控制口79、第一低压输出管线接头91、第一低压输出管线12和第一低压滑套管线接头117，打开第九常闭液控单向阀58；液压油流入第一单级液缸左腔室105，第一单级液缸活塞107向右推出至右极限位置，第一单级液缸右腔室106液压油经第一高压滑套管线接头116、处于开启状态的第九常闭进油口80、第九常闭出油口78、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第 三液压输入管线接头43和第三液压输入管线3流回油箱；同理，第二低压过油孔道97上的低压液压油经过第三常开进油口60、第三常开出油口62、第六常闭控制口70、第二低压输出管线接头92、第二低压输出管线14和第二低压滑套管线接头119，打开第六常闭液控单向阀55；液压油流入第二单级液缸左腔室108，第二单级液缸活塞111向右推出至右极限位置，第二单级液缸中间腔室109液压油经第二高压滑套管线接头118、处于开启状态的第六常闭进油口71、第六常闭出油口69、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第三液压输入管线接头43和第三液压输入管线3流回油箱；井下流量控制滑套16开度为开度1(全关)，如图6。
3)先对第一液压输入管线1打低压，再对第二输入液压管线2打高压；解码器内液压油的压力由负载决定，则第一过油孔道49、第二过油孔道50、第一低压过油孔道96和第二低压过油孔道97上先为低压；井下流量控制滑套16先重复上述步骤2)的动作，即井下流量控制滑套16开度为开度1(全关)后，第二过油孔道50和第二低压过油孔道97上压力升为高压；第二过油孔道50上高压液压油经过层位选择短节4后，通过高低压选择短节10的第四高压连接管线接头85流入第二高压过油孔道95；第二高压过油孔道95上的高压液压油经过第五常闭进油口66、第五常闭控制口68、第五常闭出油口67、第三常开控制口61、第七常闭控制口73、第二高压输出管线接头90、第二高压输出管线13和第二高压滑套管线接头118，关闭第三常开液控单向阀52和打开第七常闭液控单向阀56；高压液压油流入第二单级液缸中间腔室109，第二单级液缸活塞111向左退回至左极限位置，第二单级液缸左腔室108液压油经第二低压滑套管线接头119、处于开启状态的第七常闭进油口74、第七常闭出油口72、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第三液压输入管线接头43和第三液压输入管线3流回油箱；井下流量控制滑套16开度为开度2，如图7。
4)先对第一液压输入管线1打高压，再对第二输入液压管线2打低压；解码器内液压油的压力由负载决定，则第一过油孔道49、第二过油孔道50、第一低压过油孔道96和第二低压过油孔道97上先为低压；井下流量控制滑套16先重复上述步骤2)，即井下流量控制滑套16开度为开度1(全关)后，第一过油孔道49和第一低压过油孔道96上压力升为高压；第一过油孔道49上高压液压油经过层位选择短节4后，通过高低压选择短节10的第三高压连接管线接头84流入第一高压过油孔道94；第一高压过油孔道94上的高压液压油经过第八常闭进油口75、第八常闭控制口77、第八常闭出油口76、第四常开控制口64、第十常闭控制口81、第一高压输出管线接头89、第一高压输出管线11和第一高压滑套管线接头116，关闭第四常开液控单向阀53和打开第十常闭液控单向阀59；高压液压油流入第一单级液缸右腔室106，第一单级液缸活塞107向左退回至左极限位置，第一单级液缸左腔室105液压油经第一低压滑套管线接头117、处于开启状态的第十常闭进油口83、第十常闭出油口82、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第三液压输入管线接头43和第三液压输入管线3流回油箱；井下流量控制滑套16开度为开度3，如图8。
5)先对第一液压输入管线1打高压，再对第二输入液压管线2打高压；解码器内液压油的压力由负载决定，则第一过油孔道49、第二过油孔道50、第一低压过油孔道96和第二低压过油孔道97上先为低压；井下流量控制滑套16先重复上述步骤2)，即井下流量控制滑套16开度为开度1(全关)后，第一过油孔道49、第二过油孔道50、第一低压过油孔道96和第二低压过油孔道97上压力升为高压；第一过油孔道49和第二过油孔道50上高压液压油经过层位选择短节4后，通过高低压选择短节10的第三高压连接管线接头84和第四高压连接管线接头85流入第一高压过油孔道94和第二高压过油孔道95；第一高压过油孔道 94上的高压液压油经过第八常闭进油口75、第八常闭控制口77、第八常闭出油口76、第四常开控制口64、第十常闭控制口81、第一高压输出管线接头89、第一高压输出管线11和第一高压滑套管线接头116，关闭第四常开液控单向阀53和打开第十常闭液控单向阀59；高压液压油流入第一单级液缸右腔室106，第一单级液缸活塞107向左退回至左极限位置，第一单级液缸左腔室105液压油经第一低压滑套管线接头117、处于开启状态的第十常闭进油口83、第十常闭出油口82、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第三液压输入管线接头43和第三液压输入管线3流回油箱；第二高压过油孔道95上的高压液压油经过第五常闭进油口66、第五常闭控制口68、第五常闭出油口67、第三常开控制口61、第七常闭控制口73、第二高压输出管线接头90、第二高压输出管线13和第二高压滑套管线接头118，关闭第三常开液控单向阀52和打开第七常闭液控单向阀56；高压液压油流入第二单级液缸中间腔室109，第二单级液缸活塞111向左退回至左极限位置，第二单级液缸左腔室108液压油经第二低压滑套管线接头119、处于开启状态的第七常闭进油口74、第七常闭出油口72、第二回油连接管线接头88、第一回油连接管线9、第一回油连接管线接头48、开启状态的第三常闭出油口36、第三常闭进油口35、第三液压输入管线接头43和第三液压输入管线3流回油箱；井下流量控制滑套16开度为开度4(全开)，如图9。
本实施方式根据三根液压输入管线可有六种接线组合，可单独开启井下各六层解码器，从而控制目标油气层的流量控制滑套的动作。可选定两根压力输入管线不同的压力组合，即低压-低压、低压-高压、高压-低压和高压-高压控制，实现第一和第二单级液缸活塞的不同运动形式，使流量控制滑套具有四种不同的开度，从而实现对目标油气层的流量控制。本发明不采用井下电子设备即可实现井下目标层的流量控制。
需要说明的是，在本文中，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的系统或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制；诸如“第一”和“第二”等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
此外，在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。
上述各实施例仅用于说明本发明，其中实施例的各零部件、装置都是可以有所变化的，各实施方式都可根据需要进行组合或删减，附图中并非所有部件都是必要设置，本文中所定义的一般原理可以在不脱离本申请的精神或范围的情况下，在其它实施例中实现。因此，本申请将不会被限制于本文所述的这些实施例，凡是在本发明技术方案的基础上进行的等同变换和改进，均不应排除在本发明的保护范围之外。
Claims (10)
- 一种井下滑套层位选择和开度控制的液压系统，其特征在于，所述系统包括：层位选择短节，包括一组液压输入口和一组液压输出口，及位于所述一组液压输入口和一组液压输出口之间连接的第一组液控阀，被配置为通过所述一组液控阀控制所述一组液压输出口的开闭；高低压选择短节，包括一组液压连接口和一组高低压输出口及回油口，及位于所述一组液压连接口和一组高低压输出口及回油口之间连接的第二组液控阀，其中所述一组液压连接口分别与所述一组液压输出口一一对应连接，被配置为通过所述第二组液控阀及所述层位选择短节的输入方式及加压的调整控制所述一组高低压输出口及回油口的开闭。
- 根据权利要求1所述的井下滑套层位选择和开度控制的液压系统，其特征在于，所述系统包括多层控制系统，每层控制系统包括相连接的所述层位选择短节和高低压选择短节，多层控制系统为并联连接。
- 根据权利要求2所述的井下滑套层位选择和开度控制的液压系统，其特征在于，所述系统包括六层控制系统，所述一组液压输入口的数量为三个。
- 根据权利要求2或3所述的井下滑套层位选择和开度控制的液压系统，其特征在于，所述层位选择短节还包括三个过油孔道，所述第一组液控阀包括两个常开液控单向阀、四个常闭液控单向阀，所述三个过油孔道的两端分别设有对应的所述液压输入口和液压输出口，其 中，第一过油孔道上依次设置一常开液控单向阀和一常闭液控单向阀，第二过油孔道上依次设置两个常闭液控单向阀，第三过油孔道上设置一个常闭液控单向阀，自第二过油孔道的输入口引出一常开液控单向阀与所述第一过油孔道上的常开液控单向阀相互联控，其他常闭液控单向阀之间两两联控，最终引出五个液压输出口。
- 根据权利要求3所述的井下滑套层位选择和开度控制的液压系统，其特征在于，所述高低压选择短节还包括一个输出回油孔道和另外八个过油孔道，所述第二组液控阀包括两个常开液控单向阀和六个常闭液控单向阀，每个过油孔道上设置一个单向阀，四个过油孔道为一组，共形成两组对称并联的油路，每组中，其中两个过油孔道上设有流向相同的常开液控单向阀和常闭液控单向阀，另外两个过油孔道上设有与所述其中两个过油孔道流向不同的常闭液控单向阀，该组中两两进行联控设置；所述输出回油孔道与所述两组油路并联设置。
- 根据权利要求1至3或5任一项所述的井下滑套层位选择和开度控制的液压系统，其特征在于，所述系统还包括滑套，所述滑套包括壁内的两级伸缩液缸和分布于壁上连通内外的径向孔，所述两级伸缩液缸包括第一单级液缸和第二单级液缸；所述第一单级液缸包括第一单级液缸左腔室、第一单级液缸右腔室和第一单级液缸活塞；所述第二单级液缸包括第二单级液缸左腔室、第二单级液缸中间腔室、第二单级液缸右腔室和第二单级液缸活塞；所述第二单级液缸的缸体部分与所述第一单级液缸的活塞杆部分连接；所述径向孔为井下产层油气流动通道；所述高低压选择短节的输出口一一对应分别连接所述滑套 的各个腔室。
- 一种根据权利要求1至6任一项所述的井下滑套层位选择和开度控制的液压系统的使用方法，其特征在于，所述方法包括：通过在输入口设置不同的液压加压次序，以激活不同层位的层位选择短节，通过控制相应液压管线的压力值，进行不同高低压组合的输入，以改变相应层位高低压选择短节出口输油和回油方向，从而被配置为控制相应层位滑套中活塞不同的动作，进而实现相应层位滑套的开度控制。
- 根据权利要求7所述液压系统的使用方法，其特征在于，所述高低压选择短节的输出口连接两级液压伸缩滑套的活塞缸，所述滑套设有一组不同位置的径向通孔，通过对不同活塞缸的输入油或回油控制能够使得所述径向通孔打开或被封堵，得到不同的流出口数量。
- 根据权利要求7或8所述液压系统的使用方法，其特征在于，当所述第一单级液缸活塞和第二单级液缸活塞处于不同位置，两级伸缩液缸的活塞杆端部被带至不同位置，以封堵或打开所述径向孔中的一部分或全部，从而实现井下流量控制阀的流量调节功能。
- 根据权利要求9所述的液压系统的使用方法，其特征在于，加压时在输入口留一个输入口作为回油口，选择其他输入口作为加压口，加压口的压力根据需要设置为相同或不同；每次加压前，均先将滑套的径向孔均封堵，再进行开度的调整动作。
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| CN115749683B (zh) * | 2022-12-26 | 2023-04-11 | 西南石油大学 | 单根管线控制多层滑套的解码设备及方法 |
| CN115898344B (zh) * | 2023-02-21 | 2023-05-19 | 西南石油大学 | 一种用于井下行程控制的流量控制系统及方法 |
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| CN114135527A (zh) * | 2021-12-02 | 2022-03-04 | 中海石油(中国)有限公司 | 一种井下滑套层位选择和开度控制的液压系统及其方法 |
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| CN108868707B (zh) * | 2018-06-21 | 2020-10-02 | 中国海洋石油集团有限公司 | 一种液压控制的智能完井系统及控制方法 |
| CN110847859B (zh) * | 2019-11-11 | 2021-09-14 | 中国海洋石油集团有限公司 | 一种智能完井井下流量阀地面控制超高压液压系统 |
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| JP2004340187A (ja) * | 2003-05-13 | 2004-12-02 | Izumi Products Co | 油圧アタッチメントの油圧回路 |
| US10156095B1 (en) * | 2017-03-15 | 2018-12-18 | Larry G. Keast | Top drive and power swivel with high pressure seals and automatic refilling lubrication reservoir |
| CN108775234A (zh) * | 2018-06-29 | 2018-11-09 | 托普威尔石油技术股份公司 | 一种分层求产控制工具 |
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| CN114135527A (zh) * | 2021-12-02 | 2022-03-04 | 中海石油(中国)有限公司 | 一种井下滑套层位选择和开度控制的液压系统及其方法 |
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