Hydraulic rodless oil extraction device

Abstract

The invention discloses a hydraulic rodless oil extraction device. Comprising a columnar pump body and a matched pipeline axially arranged in the pump body, and the pump body is sequentially composed of a connecting column section, a functional section and a tailstock from top to bottom; the matched pipeline comprises an uplink signal pipeline, a downlink signal pipeline, a liquid inlet pipeline, a liquid return pipeline and a crude oil pipeline; a main pipeline is arranged in the center of the functional section, and an upper functional cavity, a reciprocating pump cavity and a lower functional cavity which are in water seal with one another are sequentially arranged in the main pipeline from top to bottom; an ejector rod assembly, a signal valve assembly, a reset spring and a reversing valve assembly are sequentially arranged in each functional cavity in the axial direction, and the ejector rod assemblies are located on the side close to the reciprocating pump cavity. A signal piston is omitted, and the structure is relatively simple.

Description

Technical Field

[0001] This invention relates to a hydraulic rodless oil extraction device. Background Technology

[0002] To overcome the serious mechanical accidents such as uneven wear and rod drop that easily occur when existing equipment is used to extract heavy oil, Chinese Patent No. 201410675560.7 discloses a hydraulic double-acting rodless oil pump. This rodless oil pump utilizes a surface power pump to deliver pressurized hydraulic flow along a power hose to the inlet pipeline of the hydraulic double-acting rodless oil pump. Under the action of the hydraulic flow, the reciprocating pump converts hydraulic energy into mechanical energy, performing up-and-down reciprocating motion, thus driving the crude oil pipeline to achieve oil suction and lifting. This rodless oil pump has no pump rod, making it suitable for highly deviated wells and horizontal wells. It eliminates serious mechanical accidents such as uneven wear or rod drop caused by the reciprocating motion of the sucker rod; therefore, it has high transmission reliability, simple and flexible operation, and saves energy.

[0003] However, the above scheme uses signal pistons and reversing pistons for control, and the structure includes both long and short signal pipelines in the same signal pipeline, making it relatively complex and leaving room for improvement. Summary of the Invention

[0004] To overcome the above-mentioned defects, the purpose of this invention is to provide a hydraulic rodless oil extraction device.

[0005] To achieve the above objectives, the hydraulic rodless oil extraction device of the present invention includes a columnar pump body and a supporting pipeline axially arranged in the pump body. The pump body includes at least a connecting column section and a functional section. The supporting pipeline includes an upward signal pipeline, a downward signal pipeline, a liquid inlet pipeline, a liquid return pipeline, and a crude oil pipeline.

[0006] The main pipeline is located at the center of the functional section. The upper functional chamber, reciprocating pump chamber, and lower functional chamber are arranged sequentially from top to bottom within the main pipeline. Each functional chamber is axially arranged with a push rod assembly, a signal valve assembly, a reset spring, and a reversing valve assembly. The push rod assembly is located near the reciprocating pump chamber.

[0007] Reciprocating pump chamber:

[0008] A baffle is provided in the middle of the reciprocating pump chamber, which divides the reciprocating pump chamber into two equal and isolated pump chambers. A working shaft adapted to the baffle is provided in the reciprocating pump chamber. The two ends of the working shaft pass through the baffle and are placed in the two pump chambers respectively. Working pistons are provided at the ends of the working shaft. The main pipeline sidewall at the end of the two pump chamber far from the baffle is provided with working fluid inlet and outlet, and the main pipeline sidewall at the end near the baffle is provided with crude oil inlet and outlet.

[0009] Push rod assembly:

[0010] It consists of a push rod and a push rod sleeve fitted over the push rod; the push rod consists of a large-diameter push rod cap section and a small-diameter push rod core section. The free end of the push rod core section passes through the push rod sleeve and extends into the reciprocating pump chamber to contact the working piston. A stroke cavity is provided in the push rod sleeve corresponding to the push rod cap section, and the stroke of the stroke cavity is greater than the thickness of the push rod cap by H1; the push rod can reciprocate axially within the push rod sleeve under the push of the working piston and the action of the valve body of the signal valve.

[0011] Signal valve assembly:

[0012] A signal valve body capable of axial displacement under the action of a push rod and a reversing valve; the signal valve body consists of a cylindrical valve sleeve and a signal valve core; the signal valve core consists of a large-diameter valve core cap section and a small-diameter valve core rod section, the valve core rod section being located inside the valve sleeve, the diameter of the valve core rod section being smaller than the inner diameter of the valve sleeve, and an annular flow space being formed between the outer wall of the small-diameter section and the inner wall of the valve sleeve; the valve core cap section is located on the side of the remote isolator, the valve core cap section being larger than the inner diameter of the valve sleeve but smaller than the outer diameter of the valve sleeve; the valve core cap section can form a contact seal with the valve sleeve opening on the corresponding side; the length of the valve core rod section is greater than the length of the valve sleeve by H2; the diameter of the push rod cap in the push rod assembly is smaller than the outer diameter of the valve sleeve but larger than the inner diameter of the valve sleeve; where H1=H2;

[0013] On the side wall of the main pipeline: a signal return through hole connected to the return pipeline and a valve body signal through hole connected to the signal pipeline are provided near the stop point of the signal valve body;

[0014] Reversing valve assembly:

[0015] It consists of a reversing valve body and a reversing return piston, with the reversing return piston located on the near-isolation side and the reversing valve body located on the far-isolation side.

[0016] The reversing valve body consists of a reversing valve sleeve and a reversing valve core disposed within the reversing valve sleeve; the far-isolated end of the reversing valve sleeve is provided with an inlet hole communicating with the inlet pipeline, the near-isolated end of the reversing valve sleeve is provided with a return hole communicating with the return pipeline, and a signal hole communicating with the signal pipeline is provided in the middle of the reversing valve sleeve; the diameter of the working section of the reversing return piston is larger than the diameter of the working section of the reversing valve core.

[0017] When the reversing valve core is at the stop point of the remote isolator, the low pressure of the return port is connected to the signal port. When the reversing valve core is at the stop point of the near isolator, the high pressure of the inlet port is connected to the signal port. The near isolator end of the reversing valve core is provided with a protrusion extending out of the reversing valve sleeve. This protrusion contacts the remote isolator end of the reversing return piston.

[0018] On the side wall of the main pipeline, a reversing inlet through hole is provided corresponding to the inlet hole of the reversing valve and is connected to the inlet pipeline. The reversing inlet through hole is connected to the inlet hole of the reversing valve sleeve. On the side wall of the main pipeline corresponding to the signal hole in the middle of the reversing valve sleeve, a reversing signal through hole is provided and is connected to the signal pipeline. On the side wall of the main pipeline between the reversing valve body and the reversing return piston, a reversing return through hole is provided and is connected to the return through pipeline. The reversing return through hole is connected to the return hole of the reversing valve sleeve.

[0019] Piping:

[0020] One end of the downlink signal pipeline is connected to the reversing signal through hole in the middle of the reversing valve corresponding to the upper functional chamber on one side of the main pipeline and the working fluid inlet and outlet of the upper pump chamber, and the other end is connected to the valve body signal through hole of the signal valve in the lower functional chamber.

[0021] One end of the upward signal pipe is connected to the pump chamber working fluid inlet and outlet below the reversing signal through hole in the middle of the reversing valve corresponding to the lower functional chamber on one side of the main pipeline, and the other end is connected to the valve body signal through hole of the signal valve in the upper functional chamber.

[0022] The inlet pipeline is connected to the reversing inlet port of each reversing valve;

[0023] The return pipeline is connected to the signal return through hole and the reversing return through hole of the signal valve;

[0024] Each crude oil inlet and outlet is connected to a crude oil pipeline. The crude oil pipeline below the crude oil inlet and outlet is equipped with an inlet check valve, and the crude oil pipeline above the crude oil inlet and outlet is equipped with an outlet check valve.

[0025] Motion relationship:

[0026] The high-pressure working fluid is simultaneously connected to the inlet ports of two reversing valves along the inlet pipeline;

[0027] 1) When the reversing valve core of the upper functional chamber moves to the side near the isolator, the high-pressure working fluid begins to enter the upper pump chamber through the downlink signal line and the working fluid inlet and outlet of the upper pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the lower pump chamber through the downlink signal line, pushing the reversing piston of the lower pump chamber to move towards the remote isolator. Since the diameter of the reversing piston of the lower pump chamber is larger than the diameter of the reversing valve core, the pressure on the side of the reversing valve core near the isolator is greater than the pressure on the side of the remote isolator. The reversing valve core of the lower pump chamber moves towards the remote isolator to complete the reversal. The working fluid inlet and outlet of the lower pump chamber are connected to the return line through the reversing valve, and the working fluid in the lower pump chamber begins to flow out. The working piston moves towards the lower functional chamber under the action of the working fluid, so that the crude oil already sucked in on the crude oil side of the upper pump chamber begins to be pumped out, and the crude oil side of the lower pump chamber begins to suck in crude oil.

[0028] When the working piston moves and presses down the push rod in the pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure;

[0029] At this time, in the upper functional chamber, since the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed.

[0030] 2) Further, the high-pressure working fluid begins to enter the lower pump chamber through the upward signal pipeline and the working fluid inlet and outlet of the lower pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the upper pump chamber through the upward signal pipeline, pushing the reversing piston of the upper pump chamber to move towards the remote isolator side. Since the diameter of the reversing piston of the upper pump chamber is larger than the diameter of the reversing valve core, the pressure on the reversing valve core near the isolator side is greater than the pressure on the remote isolator side. The reversing valve core of the upper pump chamber moves towards the remote isolator side to complete the reversal. The working fluid inlet and outlet of the upper pump chamber are connected to the return pipeline through the reversing valve, and the working fluid in the upper pump chamber begins to flow out. Under the action of the working fluid, the working piston moves towards the upward functional chamber, so that the crude oil already sucked in on the crude oil side of the lower pump chamber begins to be pumped out, and the crude oil side of the upper pump chamber begins to suck in crude oil.

[0031] When the working piston moves and presses against the push rod in the upper pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure;

[0032] At this time, in the lower functional chamber, because the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe, and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed.

[0033] The cycle repeats itself.

[0034] Furthermore, a water inlet chamber is provided in the middle of the connecting column section, and the water inlet chamber is connected to the liquid inlet pipeline; a return water chamber is arranged in a ring outside the water inlet chamber, and the return water chamber is connected to the crude oil pipeline and the return liquid pipeline.

[0035] Furthermore, a blowout preventer is provided in the connecting column section; the blowout preventer includes an upper docking seat and a lower docking seat, the two docking seats being connected by an outer tube; wherein, the lower docking seat is connected to the connecting column section;

[0036] An inlet pipe is coaxially arranged inside the outer pipe;

[0037] The inlet pipe is water-sealed to the inlet chamber; the outer pipe is water-sealed to the return chamber.

[0038] A sealer is provided on the outer sleeve of the water inlet pipe, and a sealing ring adapted to the water inlet pipe is provided inside the sealer;

[0039] The diameter of the seal is smaller than the inner diameter of the outer tube;

[0040] The lower section of the upper connector seat is provided with a sealing cavity that matches the outer contour of the upper section of the sealer. When the upper section of the sealer is located in the sealing cavity, it plays a role in preventing spraying.

[0041] The lower section of the seal is provided with a flow channel; the upper section of the lower connector seat is provided with a bowl-shaped cavity that matches the seal base. When the seal is located in the bowl-shaped cavity, oil can enter the annular space between the inlet pipe and the outer pipe through the return water cavity and the flow channel.

[0042] Furthermore, the sealer includes a cylindrical shell, and an outer sealing ring is provided on the outer wall of the upper section of the cylindrical shell;

[0043] An inner sealing ring is provided inside the cylindrical shell.

[0044] This invention eliminates the signal piston and optimizes the signal conduit from long and short signal conduits into a single signal conduit, resulting in a relatively simple overall structure and reduced production and manufacturing costs. Attached Figure Description

[0045] Figure 1This is an axial cross-sectional view of the inlet and outlet pipelines in the hydraulic rodless oil extraction device of the present invention.

[0046] Figure 2 for Figure 1 A schematic axial cross-sectional view of the signal pipeline in the illustrated embodiment;

[0047] Figure 3 for Figure 1 A schematic axial cross-sectional view of the crude oil pipeline in the illustrated embodiment;

[0048] Figure 4 for Figure 1 An enlarged schematic diagram of the functional segments in the illustrated embodiment.

[0049] Figure 5 for Figure 2 An enlarged schematic diagram of the functional segments in the illustrated embodiment.

[0050] Figure 6 for Figure 3 An enlarged schematic diagram of the functional segments in the illustrated embodiment.

[0051] Figure 7 for Figure 2 An enlarged schematic diagram of the upper functional cavity in the embodiment shown.

[0052] Figure 8 for Figure 2 An enlarged schematic diagram of the lower functional cavity in the illustrated embodiment.

[0053] Figure 9 for Figure 1 An enlarged schematic diagram of the upper functional cavity in the embodiment shown.

[0054] Figure 10 for Figure 1 An enlarged schematic diagram of the lower functional cavity in the illustrated embodiment.

[0055] Figure 11 This is an axial sectional view of the blowout preventer and its connecting sections – the inlet and outlet pipes.

[0056] Figure 12 This is an axial sectional view of the blowout preventer and the connecting section-crude oil pipeline.

[0057] Figure 13 This is a schematic diagram of the structure when the seal is pressed down onto the lower docking seat.

[0058] Figure 14 This is a cross-sectional schematic diagram of the seal.

[0059] Drawing number explanation:

[0060] Connecting column segment 2; Functional segment 3;

[0061] Upward signal line 51; Downward signal line 52; Inlet line 53; Return line 54; Pump oil line 55; Main line 58;

[0062] Reversing valve assemblies 61 and 62; reversing return pistons 612 and 622; reversing valve sleeves 6111 and 6211; reversing valve cores 6112 and 6212;

[0063] Signal valve assemblies 71 and 72, signal valve bodies 711 and 721, signal return pistons 712 and 722, signal valve sleeves 7111 and 7211, and signal valve cores 7112 and 7212;

[0064] Top rod assemblies 81 and 82, top rods 811 and 821, top rod sleeves 812 and 822;

[0065] Isolator 91, working shaft 92, working pistons 931 and 932; working fluid inlet / outlet 94, crude oil inlet / outlet 95, oil inlet check valve 961, oil outlet check valve 962; oil inlet 97;

[0066] Signal return through holes 5811 and 5821; valve body signal through holes 5812 and 5822; reversing inlet through holes 5814 and 5824; reversing signal through holes 5815 and 5825; reversing return through holes 5816 and 5826.

[0067] Return spring 10

[0068] Connector seats 11 and 12, outer tube 13, water inlet pipe 14, sealer 15. Detailed Implementation

[0069] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0070] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0072] like Figures 1 to 14 As shown, the rodless oil pump of the present invention includes a columnar pump body and a matching pipeline axially arranged in the pump body. The pump body includes a connecting column section 2 and a functional section 3 from top to bottom. The matching pipeline includes an upward signal pipeline 51, a downward signal pipeline 52, an inlet pipeline 53, a return pipeline 54, and an crude oil pipeline 55.

[0073] The functional section has a main pipeline 58 at its center. The main pipeline has an upper functional chamber, a reciprocating pump chamber, and a lower functional chamber that are water-sealed from top to bottom. Each functional chamber has a push rod assembly 81, 82, a signal valve assembly 71, 72, a return spring 10, and a reversing valve assembly 61, 62 arranged axially in sequence. The push rod assembly is located near the reciprocating pump chamber.

[0074] Reciprocating pump chamber:

[0075] A baffle 91 is provided in the middle of the reciprocating pump chamber, dividing the reciprocating pump chamber into two equal and isolated pump chambers. A working shaft 92 adapted to the baffle is provided in the reciprocating pump chamber. The two ends of the working shaft pass through the baffle and are placed in the two pump chambers respectively. Working pistons 932 and 932 are provided at the ends of the working shaft. Working fluid inlet and outlet 94 are provided on the side wall of the main pipeline at the end far from the baffle in the two pump chambers, and crude oil inlet and outlet 95 are provided on the side wall of the main pipeline at the end near the baffle. An oil inlet 97 is provided on the outer wall of the pump body corresponding to the end of the crude oil pipeline. An oil inlet check valve 961 is provided in the crude oil pipeline on the side of the crude oil inlet and outlet 95 near the oil inlet 97, and an oil outlet check valve 962 is provided in the crude oil pipeline on the side of the crude oil inlet and outlet 95 far from the oil inlet 97.

[0076] Push rod assembly:

[0077] It consists of push rods 811 and 821 and push rod sleeves 812 and 822 sleeved outside the push rods; the push rod consists of a large-diameter push rod cap section and a small-diameter push rod core section. The free end of the push rod core section passes through the push rod sleeve and extends into the reciprocating pump chamber to contact the working piston. A stroke cavity is provided in the push rod sleeve corresponding to the push rod cap section. The stroke of the stroke cavity is greater than the thickness of the push rod cap by H1. The push rod can reciprocate axially within the push rod sleeve under the push of the working piston and the action of the valve body of the signal valve.

[0078] Signal valve assembly:

[0079] A signal valve body capable of axial displacement under the action of a push rod and a reversing valve; the signal valve body consists of cylindrical valve sleeves 7111 and 7211 and signal valve cores 7112 and 7212; the signal valve core consists of a large-diameter valve core cap section and a small-diameter valve core rod section, the valve core rod section being located inside the valve sleeve, the diameter of the valve core rod section being smaller than the inner diameter of the valve sleeve, and an annular flow space being formed between the outer wall of the small-diameter section and the inner wall of the valve sleeve; the valve core cap section is located on the side of the remote isolator, the valve core cap section being larger than the inner diameter of the valve sleeve but smaller than the outer diameter of the valve sleeve; the valve core cap section can form a contact seal with the valve sleeve opening on the corresponding side; the length of the valve core rod section is greater than the length of the valve sleeve by H2; the diameter of the push rod cap in the push rod assembly is smaller than the outer diameter of the valve sleeve but larger than the inner diameter of the valve sleeve; wherein, H1=H2;

[0080] On the side wall of the main pipeline: a signal return through hole connected to the return pipeline and a valve body signal through hole connected to the signal pipeline are provided near the stop point of the signal valve body;

[0081] Reversing valve assembly:

[0082] It consists of a reversing valve body and a reversing return piston 612, with the reversing return piston located on the near-isolation side and the reversing valve body located on the far-isolation side.

[0083] The reversing valve body is composed of reversing valve sleeves 6111 and 6211 and reversing valve cores 6112 and 6212 disposed within the reversing valve sleeves; the far-isolated end of the reversing valve sleeve is provided with an inlet hole communicating with the inlet pipeline, the near-isolated end of the reversing valve sleeve is provided with a return hole communicating with the return pipeline, and a signal hole communicating with the signal pipeline is provided in the middle of the reversing valve sleeve; the diameter of the working section of the reversing return piston is larger than the diameter of the working section of the reversing valve core.

[0084] When the reversing valve core is at the stop point of the remote isolator, the low pressure of the return port is connected to the signal port. When the reversing valve core is at the stop point of the near isolator, the high pressure of the inlet port is connected to the signal port. The near isolator end of the reversing valve core is provided with a protrusion extending out of the reversing valve sleeve. This protrusion contacts the remote isolator end of the reversing return piston.

[0085] On the side wall of the main pipeline, corresponding to the inlet hole of the reversing valve, there are reversing inlet holes 5814 and 5824 that are connected to the inlet pipeline. The reversing inlet holes are connected to the inlet hole of the reversing valve sleeve. On the side wall of the main pipeline corresponding to the signal hole in the middle of the reversing valve sleeve, there are reversing signal holes 5815 and 5825 that are connected to the signal pipeline. On the side wall of the main pipeline between the reversing valve body and the reversing return piston, there are reversing return holes 5816 and 5826 that are connected to the return pipeline. The reversing return holes are connected to the return hole of the reversing valve sleeve.

[0086] Piping:

[0087] One end of the downlink signal pipeline 52 is connected to the reversing signal through hole 5815 in the middle of the reversing valve corresponding to the upper functional chamber on one side of the main pipeline and the working fluid inlet and outlet 94 of the upper pump chamber, and the other end is connected to the valve body signal through hole 5821 of the signal valve in the lower functional chamber.

[0088] One end of the upward signal pipe 51 is connected to the pump chamber working fluid inlet / outlet 94 below the reversing signal through hole 5825 in the middle of the reversing valve corresponding to the lower functional chamber on one side of the main pipeline, and the other end is connected to the valve body signal through hole 5822 of the signal valve in the upper functional chamber.

[0089] The inlet pipe 53 is connected to the reversing inlet port of each reversing valve;

[0090] The return line 54 is connected to the signal return through hole and the reversing return through hole of the signal valve;

[0091] Each crude oil inlet and outlet is connected to a crude oil pipeline. The crude oil pipeline below the crude oil inlet and outlet is equipped with an inlet check valve, and the crude oil pipeline above the crude oil inlet and outlet is equipped with an outlet check valve. Oil is discharged from the upper end of the crude oil pipeline, and an inlet 97 is provided at the lower end of the crude oil pipeline for drawing in oil.

[0092] Motion relationship:

[0093] The high-pressure working fluid is simultaneously connected to the inlet ports of two reversing valves along the inlet pipeline;

[0094] 1) When the reversing valve core of the upper functional chamber moves to the side near the isolator, the high-pressure working fluid begins to enter the upper pump chamber through the downlink signal line and the working fluid inlet and outlet of the upper pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the lower pump chamber through the downlink signal line, pushing the reversing piston of the lower pump chamber to move towards the remote isolator. Since the diameter of the reversing piston of the lower pump chamber is larger than the diameter of the reversing valve core, the pressure on the side of the reversing valve core near the isolator is greater than the pressure on the side of the remote isolator. The reversing valve core of the lower pump chamber moves towards the remote isolator to complete the reversal. The working fluid inlet and outlet of the lower pump chamber are connected to the return line through the reversing valve, and the working fluid in the lower pump chamber begins to flow out. The working piston moves towards the lower functional chamber under the action of the working fluid, so that the crude oil already sucked in on the crude oil side of the upper pump chamber begins to be pumped out, and the crude oil side of the lower pump chamber begins to suck in crude oil.

[0095] When the working piston moves and presses down the push rod in the pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure;

[0096] At this time, in the upper functional chamber, since the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed.

[0097] 2) Further, the high-pressure working fluid begins to enter the lower pump chamber through the upward signal pipeline and the working fluid inlet and outlet of the lower pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the upper pump chamber through the upward signal pipeline, pushing the reversing piston of the upper pump chamber to move towards the remote isolator side. Since the diameter of the reversing piston of the upper pump chamber is larger than the diameter of the reversing valve core, the pressure on the reversing valve core near the isolator side is greater than the pressure on the remote isolator side. The reversing valve core of the upper pump chamber moves towards the remote isolator side to complete the reversal. The working fluid inlet and outlet of the upper pump chamber are connected to the return pipeline through the reversing valve, and the working fluid in the upper pump chamber begins to flow out. Under the action of the working fluid, the working piston moves towards the upward functional chamber, so that the crude oil already sucked in on the crude oil side of the lower pump chamber begins to be pumped out, and the crude oil side of the upper pump chamber begins to suck in crude oil.

[0098] When the working piston moves and presses against the push rod in the upper pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure;

[0099] At this time, in the lower functional chamber, because the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe, and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed.

[0100] The cycle repeats itself.

[0101] As a further improvement to the present invention, such as Figures 11 to 14 As shown, a blowout preventer is provided on the connecting column section; the blowout preventer includes an upper docking seat 11 and a lower docking seat 12, which are connected by an outer tube 13; wherein the lower docking seat is connected to the connecting column section.

[0102] A water inlet pipe 14 is coaxially arranged inside the outer pipe;

[0103] The inlet pipe is water-sealed to the inlet chamber; the outer pipe is water-sealed to the return chamber.

[0104] A sealer 15 is provided on the outer sleeve of the water inlet pipe, and a sealing ring adapted to the water inlet pipe is provided inside the sealer.

[0105] The diameter of the seal is smaller than the inner diameter of the outer tube;

[0106] The lower section of the upper connector seat is provided with a sealing cavity that matches the outer contour of the upper section of the sealer. When the upper section of the sealer is located in the sealing cavity, it plays a role in preventing spraying.

[0107] The lower section of the seal is provided with a flow passage 154; the upper section of the lower connector seat is provided with a bowl-shaped cavity that matches the seal base. When the seal is located in the bowl-shaped cavity, oil can enter the annular space between the inlet pipe and the outer pipe through the return water cavity and the flow passage.

[0108] Furthermore, the sealer includes a cylindrical shell 151, and an outer sealing ring is provided on the outer side wall of the upper section of the cylindrical shell;

[0109] An inner sealing ring 153 is provided inside the cylindrical shell.

[0110] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0111] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0112] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hydraulic rodless oil extraction device, characterized in that, It includes a columnar pump body and an axially arranged supporting pipeline inside the pump body. The pump body includes at least a connecting column section and a functional section. The supporting pipeline includes an upward signal pipeline, a downward signal pipeline, a liquid inlet pipeline, a liquid return pipeline, and a crude oil pipeline. The main pipeline is located at the center of the functional section. The upper functional chamber, reciprocating pump chamber, and lower functional chamber are arranged sequentially from top to bottom within the main pipeline. Each functional chamber is axially arranged with a push rod assembly, a signal valve assembly, a reset spring, and a reversing valve assembly. The push rod assembly is located near the reciprocating pump chamber. Reciprocating pump chamber: A baffle is provided in the middle of the reciprocating pump chamber, which divides the reciprocating pump chamber into two equal and isolated pump chambers. A working shaft adapted to the baffle is provided in the reciprocating pump chamber. The two ends of the working shaft pass through the baffle and are placed in the two pump chambers respectively. Working pistons are provided at the ends of the working shaft. The main pipeline sidewall at the end of the two pump chamber far from the baffle is provided with working fluid inlet and outlet, and the main pipeline sidewall at the end near the baffle is provided with crude oil inlet and outlet. Push rod assembly: It consists of a push rod and a push rod sleeve fitted over the push rod; the push rod consists of a large-diameter push rod cap section and a small-diameter push rod core section. The free end of the push rod core section passes through the push rod sleeve and extends into the reciprocating pump chamber to contact the working piston. A stroke cavity is provided in the push rod sleeve corresponding to the push rod cap section, and the stroke of the stroke cavity is greater than the thickness of the push rod cap by H1; the push rod can reciprocate axially within the push rod sleeve under the push of the working piston and the action of the valve body of the signal valve. Signal valve assembly: A signal valve body capable of axial displacement under the action of a push rod and a reversing valve; the signal valve body consists of a cylindrical valve sleeve and a signal valve core; the signal valve core consists of a large-diameter valve core cap section and a small-diameter valve core rod section, the valve core rod section being located inside the valve sleeve, the diameter of the valve core rod section being smaller than the inner diameter of the valve sleeve, and an annular flow space being formed between the outer wall of the small-diameter section and the inner wall of the valve sleeve; the valve core cap section is located on the side of the remote isolator, the valve core cap section being larger than the inner diameter of the valve sleeve but smaller than the outer diameter of the valve sleeve; the valve core cap section can form a contact seal with the valve sleeve opening on the corresponding side; the length of the valve core rod section is greater than the length of the valve sleeve by H2; the diameter of the push rod cap in the push rod assembly is smaller than the outer diameter of the valve sleeve but larger than the inner diameter of the valve sleeve; where H1=H2; On the side wall of the main pipeline: a signal return through hole connected to the return pipeline and a valve body signal through hole connected to the signal pipeline are provided near the stop point of the signal valve body; Reversing valve assembly: It consists of a reversing valve body and a reversing return piston, with the reversing return piston located on the near-isolation side and the reversing valve body located on the far-isolation side. The reversing valve body consists of a reversing valve sleeve and a reversing valve core disposed within the reversing valve sleeve; the far-isolated end of the reversing valve sleeve is provided with an inlet hole communicating with the inlet pipeline, the near-isolated end of the reversing valve sleeve is provided with a return hole communicating with the return pipeline, and a signal hole communicating with the signal pipeline is provided in the middle of the reversing valve sleeve; the diameter of the working section of the reversing return piston is larger than the diameter of the working section of the reversing valve core. When the reversing valve core is at the stop point of the remote isolator, the low pressure of the return port is connected to the signal port. When the reversing valve core is at the stop point of the near isolator, the high pressure of the inlet port is connected to the signal port. The near isolator end of the reversing valve core is provided with a protrusion extending out of the reversing valve sleeve. This protrusion contacts the remote isolator end of the reversing return piston. On the side wall of the main pipeline, a reversing inlet through hole is provided corresponding to the inlet hole of the reversing valve and is connected to the inlet pipeline. The reversing inlet through hole is connected to the inlet hole of the reversing valve sleeve. On the side wall of the main pipeline corresponding to the signal hole in the middle of the reversing valve sleeve, a reversing signal through hole is provided and is connected to the signal pipeline. On the side wall of the main pipeline between the reversing valve body and the reversing return piston, a reversing return through hole is provided and is connected to the return through pipeline. The reversing return through hole is connected to the return hole of the reversing valve sleeve. Piping: One end of the downlink signal pipeline is connected to the reversing signal through hole in the middle of the reversing valve corresponding to the upper functional chamber on one side of the main pipeline and the working fluid inlet and outlet of the upper pump chamber, and the other end is connected to the valve body signal through hole of the signal valve in the lower functional chamber. One end of the upward signal pipe is connected to the pump chamber working fluid inlet and outlet below the reversing signal through hole in the middle of the reversing valve corresponding to the lower functional chamber on one side of the main pipeline, and the other end is connected to the valve body signal through hole of the signal valve in the upper functional chamber. The inlet pipeline is connected to the reversing inlet port of each reversing valve; The return pipeline is connected to the signal return through hole and the reversing return through hole of the signal valve; Each crude oil inlet and outlet is connected to a crude oil pipeline. The crude oil pipeline below the crude oil inlet and outlet is equipped with an inlet check valve, and the crude oil pipeline above the crude oil inlet and outlet is equipped with an outlet check valve. Motion relationship: The high-pressure working fluid is simultaneously connected to the inlet ports of two reversing valves along the inlet pipeline; 1) When the reversing valve core of the upper functional chamber moves to the side near the isolator, the high-pressure working fluid begins to enter the upper pump chamber through the downlink signal line and the working fluid inlet and outlet of the upper pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the lower pump chamber through the downlink signal line, pushing the reversing piston of the lower pump chamber to move towards the remote isolator. Since the diameter of the reversing piston of the lower pump chamber is larger than the diameter of the reversing valve core, the pressure on the side of the reversing valve core near the isolator is greater than the pressure on the side of the remote isolator. The reversing valve core of the lower pump chamber moves towards the remote isolator to complete the reversal. The working fluid inlet and outlet of the lower pump chamber are connected to the return line through the reversing valve, and the working fluid in the lower pump chamber begins to flow out. The working piston moves towards the lower functional chamber under the action of the working fluid, so that the crude oil already sucked in on the crude oil side of the upper pump chamber begins to be pumped out, and the crude oil side of the lower pump chamber begins to suck in crude oil. When the working piston moves and presses down the push rod in the pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure; At this time, in the upper functional chamber, since the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed. 2) Further, the high-pressure working fluid begins to enter the lower pump chamber through the upward signal pipeline and the working fluid inlet and outlet of the lower pump chamber. At the same time, high pressure is applied to the valve body signal through hole of the upper pump chamber through the upward signal pipeline, pushing the reversing piston of the upper pump chamber to move towards the remote isolator side. Since the diameter of the reversing piston of the upper pump chamber is larger than the diameter of the reversing valve core, the pressure on the reversing valve core near the isolator side is greater than the pressure on the remote isolator side. The reversing valve core of the upper pump chamber moves towards the remote isolator side to complete the reversal. The working fluid inlet and outlet of the upper pump chamber are connected to the return pipeline through the reversing valve, and the working fluid in the upper pump chamber begins to flow out. Under the action of the working fluid, the working piston moves towards the upward functional chamber, so that the crude oil already sucked in on the crude oil side of the lower pump chamber begins to be pumped out, and the crude oil side of the upper pump chamber begins to suck in crude oil. When the working piston moves and presses against the push rod in the upper pump chamber, causing the push rod cap to move downward to the lower end of the stroke chamber, the signal valve core cap disengages from the valve core sleeve, and the valve body signal through hole connects with the signal return through hole, so that the signal pipeline connected to the valve body signal through hole becomes low pressure; when the signal valve core continues to move towards the remote isolator stop position under the action of the push rod, the push rod cap drives the valve core sleeve to move towards the remote isolator side, the connection between the valve body signal through hole and the signal return through hole is cut off, and at the same time, the return spring further pushes the reversing piston to squeeze the reversing valve core; at this time, the side of the reversing piston near the isolator connects with the signal return through hole and return pipeline through the annular flow space, forming low pressure; At this time, in the lower functional chamber, because the pressure is low on the side of the reversing piston near the isolator, the reversing valve core moves towards the isolator under the high pressure of the inlet pipe, and pushes the reversing piston to move towards the isolator. At the same time, it pushes the signal valve assembly and the push rod assembly to the position near the isolator stop point. The connection between the valve body signal through hole and the signal return through hole is cut off, and the reversing of the upper functional chamber reversing valve core is completed. The cycle repeats itself.

2. The hydraulic rodless oil extraction device as described in claim 1, characterized in that, A water inlet chamber is provided in the middle of the connecting column section, and the water inlet chamber is connected to the liquid inlet pipeline; a return water chamber is arranged in a ring outside the water inlet chamber, and the return water chamber is connected to the crude oil pipeline and the return liquid pipeline.

3. The hydraulic rodless oil extraction device as described in claim 1, characterized in that, A blowout preventer is provided on the connecting column section; the blowout preventer includes an upper docking seat and a lower docking seat, the two docking seats being connected by an outer tube; wherein, the lower docking seat is connected to the connecting column section; An inlet pipe is coaxially arranged inside the outer pipe; The inlet pipe is water-sealed to the inlet chamber; the outer pipe is water-sealed to the return chamber. A sealer is provided on the outer sleeve of the water inlet pipe, and a sealing ring adapted to the water inlet pipe is provided inside the sealer; The diameter of the seal is smaller than the inner diameter of the outer tube; The lower section of the upper connector seat is provided with a sealing cavity that matches the outer contour of the upper section of the sealer. When the upper section of the sealer is located in the sealing cavity, it plays a role in preventing spraying. The lower section of the seal is provided with a flow channel; the upper section of the lower connector seat is provided with a bowl-shaped cavity that matches the seal base. When the seal is located in the bowl-shaped cavity, oil can enter the annular space between the inlet pipe and the outer pipe through the return water cavity and the flow channel.

4. The hydraulic rodless oil extraction device as described in claim 1, characterized in that, The sealer includes a cylindrical shell, and an outer sealing ring is provided on the outer wall of the upper section of the cylindrical shell; An inner sealing ring is provided inside the cylindrical shell.

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