CN110318712B - A special downhole hydraulic motor for oil production - Google Patents

Abstract

The invention relates to drainage equipment, in particular to a downhole hydraulic motor special for oil extraction of a highly deviated well and a horizontal well. The utility model provides a special hydraulic motor in pit of oil recovery, including hydraulic cylinder, hydraulic cylinder upper end is opened there is the liquid ascending channel of producing, hydraulic cylinder upper and lower both ends set up seal cover and lower seal cover respectively, set up the double-channel plunger in the cylinder, double-channel plunger includes the plunger main part, go up hollow piston rod and lower hollow piston rod, the plunger main part is opened there is high pressure power fluid passageway and low pressure liquid passageway of producing, high pressure power fluid passageway upper end intercommunication goes up hollow piston rod, it is located the seal cover to go up hollow piston rod upper portion, low pressure liquid passageway lower extreme intercommunication hollow piston rod down, hollow piston rod lower part passes down the seal cover down. The invention has simple structure, low energy consumption and high extraction efficiency, and is suitable for rodless oil extraction operation of highly inclined wells and horizontal wells.

Description

A special downhole hydraulic motor for oil production

Technical field

The invention relates to a drainage and production equipment, specifically a special downhole hydraulic motor for oil production suitable for highly deviated wells and horizontal wells.

Background technique

In the process of oilfield production and coalbed methane development, with the development of drilling and drainage technology, the number of highly deviated wells and horizontal wells increased. Many new problems have arisen in the production process of traditional rod-type drainage equipment, such as the sucker rod breaking off due to eccentric wear, the oil pipe being scrapped due to eccentric wear, and the pump inspection cycle being shortened. Although domestic and foreign efforts have been vigorously developed to develop various rod-less drainage equipment, Such as electric submersible screw pumps, electric submersible pumps, hydraulic piston pumps, and jet pumps. At present, these drainage and mining equipment are unsatisfactory and difficult to break through technically. They all have their own shortcomings that are difficult to overcome and are not practical.

Contents of the invention

The purpose of the present invention is to provide a special downhole hydraulic motor for oil production that has a simple structure, low energy consumption, high drainage efficiency, and realizes rodless drainage.

The technical solution of the present invention is:

A special downhole hydraulic motor for oil production, including a hydraulic cylinder barrel. The upper end of the hydraulic cylinder barrel is provided with an upward channel for production fluid. The upper and lower ends of the hydraulic cylinder barrel are respectively provided with upper sealing sleeves and lower sealing sleeves. A double-flow channel plunger is provided in the cylinder barrel. , a double-flow channel plunger includes a plunger body, an upper hollow piston rod, and a lower hollow piston rod. The plunger body has a high-pressure power fluid channel and a low-pressure liquid production channel. The upper end of the high-pressure power fluid channel is connected to the upper hollow piston rod, and the upper hollow piston The upper part of the rod is located in the upper sealing sleeve. The lower end of the low-pressure liquid flow channel is connected to the lower hollow piston rod. The lower part of the lower hollow piston rod passes through the lower sealing sleeve. The diameter of the upper hollow piston rod is smaller than the diameter of the lower hollow piston rod.

Specifically, the upper end of the hydraulic cylinder barrel is connected to the upper oil pipe nipple through the upper joint of the cylinder barrel. An upper sealing sleeve is provided at the center of the upper joint of the cylinder barrel. There is an upward channel for the output fluid on the upper joint of the cylinder barrel to connect the hydraulic cylinder barrel to the upper oil pipe. The lower end of the hydraulic cylinder barrel is connected to the lower oil pipe nipple through the lower joint of the cylinder barrel, and a lower sealing sleeve is set at the center of the lower joint of the cylinder barrel.

Specifically, the lower end of the lower hollow piston rod is connected to the hollow tie rod joint. There is a hole on the side of the hollow tie rod joint, and the hole connects the inside of the lower hollow piston rod and the inside of the lower oil pipe short connection.

Specifically, the longitudinal axes of the upper hollow piston rod, the piston body and the lower hollow piston rod are on the same straight line.

The lower end of the double-channel plunger of the present invention is connected to the oil pump plunger, and the power fluid drives the double-channel plunger upward; the hydraulic feedback force drives the double-channel plunger downward, realizing rod-less drainage and completely eliminating the problems of the oil rod lifting process. The problem of eccentric wear; the invention has a simple structure, low energy consumption and high production efficiency, and is suitable for rodless oil production operations in highly deviated wells and horizontal wells.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention.

1 Upper oil pipe short connection 2 Upper sealing sleeve 3 Cylinder upper joint 4 Upper hollow piston rod 5 Hydraulic cylinder barrel 6 Plunger body 7 High-pressure power fluid channel 8 Low-pressure liquid flow channel 9 Lower hollow piston rod 10 Lower sealing sleeve 11 Cylinder barrel Lower joint 12 Lower oil pipe short connection 13 Hollow tie rod joint 14 Lower annulus of cylinder tube 15 Upper annulus of cylinder tube.

Detailed ways

A special downhole hydraulic motor for oil production, including a hydraulic cylinder 5. The upper end of the hydraulic cylinder 5 is connected to the upper oil pipe nipple through the cylinder upper joint 3. The upper oil pipe short joint 1 is used to connect to the oil well oil pipe. The cylinder upper joint 3 is centered An upper sealing sleeve 2 is provided, the upper end of the upper sealing sleeve 2 is connected to the lower end of the small concentric oil pipe of the oil well, and the upper end of the small concentric oil pipe of the oil well is connected to the ground power equipment; the upper joint 3 of the cylinder barrel has an upward channel for the output fluid to allow the hydraulic cylinder barrel 5 to connect with the upper end of the oil well. The oil pipe short-circuit 1 is connected, the lower end of the hydraulic cylinder barrel 5 is connected to the lower oil pipe nipple through the cylinder lower joint 11, the lower oil pipe short-circuit 12 is connected to the oil pump barrel, and a lower sealing sleeve 10 is set at the center of the cylinder lower joint 11.

A dual-flow channel plunger is provided in the cylinder. The double-flow channel plunger includes a plunger body 6, an upper hollow piston rod 4, and a lower hollow piston rod 9. An upper cylinder annulus 15 is formed above the plunger body 6, and an upper annulus 15 is formed below the plunger body 6. The lower annulus 14 of the cylinder barrel, the diameter of the upper hollow piston rod 4 is smaller than the diameter of the lower hollow piston rod 9, the plunger body 6 has a high-pressure power fluid channel 7 and a low-pressure liquid production flow channel 8, the upper end of the high-pressure power fluid channel 7 is connected to the upper Hollow piston rod 4, the upper part of the upper hollow piston rod 4 is located in the upper sealing sleeve 2, the lower end of the low-pressure liquid flow channel 8 is connected to the lower hollow piston rod 9, the lower part of the lower hollow piston rod 9 passes through the lower sealing sleeve 10, and the lower hollow piston rod 9 The lower end is connected to the hollow tie rod joint 13. There is a hole on the side of the hollow tie rod joint 13. The hole connects the inside of the lower hollow piston rod 9 and the inside of the lower oil pipe short-circuit 12. The lower end of the hollow tie rod joint 13 is connected to the plunger of the oil pump.

The working process of the present invention is: during the upstroke, the power fluid passes through the upper sealing sleeve 2, the upper hollow piston rod 4, and the high-pressure power fluid channel 7 of the plunger body 6 in sequence, enters the lower annulus 14 of the cylinder, and pushes the plunger body 6 upward, driving the hollow tie rod joint 13 and the oil pump plunger upward; during the downward stroke, the ground power hydraulic pressure decreases, and the annulus output fluid and the power hydraulic pressure of the concentric small oil pipe are basically balanced. Since the annulus 14 under the cylinder has an annulus area larger than The annulus area of the annulus 15 on the cylinder barrel, the plunger body 6 moves downward under the action of hydraulic feedback force, dragging the plunger body 6 downward, and drives the plunger of the oil pump downward through the hollow tie rod joint 13 to produce liquid Through the hollow tie rod joint 13, the lower hollow piston rod 9, and the low-pressure liquid flow channel 8 of the plunger body 6, it enters the upper part of the plunger body 6, passes through the annulus of the oil pipe and the concentric small oil pipe, and is lifted to the ground.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the present invention can still be modified Modifications to the specific embodiments of the invention or equivalent substitutions of some of the technical features without departing from the spirit of the technical solution of the present invention shall be covered by the scope of the technical solution claimed by the present invention.

Claims (2)

1. The utility model provides a special hydraulic motor in pit of oil recovery, a serial communication port, including hydraulic cylinder, hydraulic cylinder upper end is opened there is the output liquid up-going passageway, hydraulic cylinder upper and lower both ends set up seal cover and lower seal cover respectively, set up double-flow way plunger in the cylinder, double-flow way plunger includes the plunger main part, go up hollow piston rod and lower hollow piston rod, go up hollow piston rod, the longitudinal axis of the hollow piston rod is on same straight line with lower hollow piston rod, the plunger main part is opened there is high-pressure power fluid passageway and low pressure output liquid runner, high-pressure power fluid passageway upper end intercommunication goes up hollow piston rod, go up hollow piston rod upper portion and be located the seal cover, low pressure output liquid runner lower extreme intercommunication hollow piston rod, lower hollow piston rod lower part passes lower seal cover, go up hollow piston rod's diameter is less than the diameter of lower hollow piston rod, hollow piston rod lower extreme connection hollow pull rod connects, hollow pull rod connects the side and opens porose, the hole is inside hollow piston rod and lower oil pipe short circuit is inside down in the hole intercommunication.

2. The underground hydraulic motor special for oil extraction according to claim 1, wherein the upper end of the hydraulic cylinder is connected with an upper oil pipe nipple through a cylinder upper joint, an upper sealing sleeve is arranged at the center of the cylinder upper joint, an output liquid ascending channel is arranged on the cylinder upper joint to enable the hydraulic cylinder to be communicated with the upper oil pipe nipple in a short circuit manner, the lower end of the hydraulic cylinder is connected with a lower oil pipe nipple through a cylinder lower joint, and a lower sealing sleeve is arranged at the center of the cylinder lower joint.