CN110318712A - A kind of dedicated underground hydraulic motor that recovers the oil - Google Patents

Abstract

The invention relates to a drainage equipment, in particular to a special downhole hydraulic motor suitable for highly deviated wells and horizontal wells. A special downhole hydraulic motor for oil production, including a hydraulic cylinder, the upper end of the hydraulic cylinder is provided with an upward channel for production fluid, the upper and lower ends of the hydraulic cylinder are respectively provided with an upper sealing sleeve and a lower sealing sleeve, and a double-channel plunger is arranged in the cylinder , the double-channel plunger includes a plunger body, an upper hollow piston rod and a lower hollow piston rod. The plunger body is provided with a high-pressure power fluid channel and a low-pressure production fluid channel. The upper part of the rod is located in the upper sealing sleeve, the lower end of the low-pressure liquid production channel is connected to the lower hollow piston rod, and the lower part of the lower hollow piston rod passes through the lower sealing sleeve. The invention has the advantages of simple structure, low energy consumption and high drainage and production efficiency, and is suitable for rodless oil production operations in highly deviated wells and horizontal wells.

Description

A special downhole hydraulic motor for oil production

technical field

The invention relates to a drainage equipment, in particular to 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 technologies, the number of highly deviated wells and horizontal wells has increased. There are many new problems in the production process of traditional rod drainage equipment, such as the breakage of the sucker rod due to eccentric wear, the scrapping of the tubing due to eccentric wear, and the shortening of the pump inspection cycle; Such as electric submersible screw pumps, electric submersible pumps, hydraulic piston pumps, and jet pumps. At present, these drainage equipment are not satisfactory, and it is difficult to make breakthroughs in technology. They all have their own defects that are difficult to overcome, and they are not practical.

Contents of the invention

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

Technical scheme of the present invention is:

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

Specifically, the upper end of the hydraulic cylinder is connected to the short joint of the upper oil pipe through the upper joint of the cylinder, and the upper sealing sleeve is arranged at the center of the upper joint of the cylinder, and the upper joint of the cylinder is opened with an upward channel of the output fluid so that the hydraulic cylinder and the upper oil pipe are short-circuited. The lower end of the hydraulic cylinder is connected to the lower oil pipe nipple through the lower joint of the cylinder, and the lower sealing sleeve is set at the center of the lower joint of the cylinder.

Specifically, the lower end of the lower hollow piston rod is connected to the hollow tie rod joint, and a hole is opened on the side of the hollow tie rod joint, and the hole communicates with the interior of the lower hollow piston rod and the short-circuited interior of the lower oil pipe.

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 plunger of the oil well pump, and the dual-channel plunger is driven upward by the power fluid; the double-channel plunger is driven downward by the hydraulic feedback force, thereby realizing rodless drainage and completely eliminating the failure of the oil rod lifting process. Eccentric wear problem; the invention has the advantages of simple structure, low energy consumption and high drainage efficiency, and is suitable for rodless oil production operations in highly deviated wells and horizontal wells.

Description of drawings

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

1 Short connection of upper oil pipe 2 Upper sealing sleeve 3 Upper joint of cylinder barrel 4 Upper hollow piston rod 5 Hydraulic cylinder barrel 6 Plunger main body 7 High pressure power fluid channel 8 Low pressure production 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 barrel 15 Upper annulus of cylinder barrel.

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 short joint of the upper oil pipe through the upper joint 3 of the cylinder, the upper oil pipe short 1 is used to connect with the oil well oil pipe, and the upper joint 3 of the cylinder is in the center An upper sealing sleeve 2 is arranged at the upper end of the upper sealing sleeve 2, and the upper end of the upper sealing sleeve 2 is connected to the lower end of the oil well concentric small oil pipe, and the upper end of the oil well concentric small oil pipe is connected to the ground power equipment; the upper joint 3 of the cylinder is provided with an upward channel of the output fluid so that the hydraulic cylinder 5 and the upper The oil pipe is shorted 1 to communicate, the lower end of the hydraulic cylinder 5 is connected to the lower oil pipe nipple through the cylinder lower joint 11, the lower oil pipe short 12 is connected to the pump barrel of the oil pump, and the lower sealing sleeve 10 is set at the center of the lower joint 11 of the cylinder.

A double-channel plunger is arranged inside the cylinder, and the double-channel plunger includes a plunger main body 6, an upper hollow piston rod 4 and a lower hollow piston rod 9, an upper annulus 15 of the cylinder is formed above the plunger main body 6, and an annular space 15 is formed below the plunger main body 6. The lower annular space 14 of the cylinder, 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 is provided with a high-pressure power fluid channel 7 and a low-pressure production fluid channel 8, and 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 production 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 with the hollow tie rod joint 13, and the side of the hollow tie rod joint 13 has a hole.

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 annular space 14 of the cylinder, and pushes the plunger body 6 Upstroke drives the hollow tie rod joint 13 and the plunger of the oil well pump upward; during the downstroke, the power hydraulic pressure on the ground decreases, and the pressure of the output fluid in the annular space and the power hydraulic pressure of the concentric small oil pipe are basically balanced. The annulus area of the upper annulus 15 of the cylinder, the plunger main body 6 moves downward under the action of the hydraulic feedback force, drags the plunger main body 6 downward, and drives the plunger of the oil well pump downward through the hollow tie rod joint 13, and the output fluid Through the hollow tie rod joint 13, the lower hollow piston rod 9, and the low-pressure production liquid channel 8 of the plunger body 6, it enters the upper part of the plunger body 6, passes through the oil pipe and the concentric small oil pipe annulus, and lifts to the ground.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; 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 Modifications to the specific implementation of the invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (4)

1. A special downhole hydraulic motor for oil production, characterized in that it comprises a hydraulic cylinder, the upper end of the hydraulic cylinder is provided with an upward channel for production fluid, the upper and lower ends of the hydraulic cylinder are respectively provided with an upper sealing sleeve and a lower sealing sleeve, and the cylinder A double-channel plunger is set inside. The double-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 production fluid channel. Piston rod, the upper part of the upper hollow piston rod is located in the upper sealing sleeve, the lower end of the low-pressure liquid production 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, and the diameter of the upper hollow piston rod is smaller than that of the lower hollow piston rod . 2. A special downhole hydraulic motor for oil recovery according to claim 1, characterized in that the upper end of the hydraulic cylinder is connected to the short joint of the oil pipe through the upper joint of the cylinder, and an upper sealing sleeve is arranged at the center of the upper joint of the cylinder, and the upper end of the cylinder is There is an upward channel of production fluid on the joint to connect the hydraulic cylinder with the short connection of the upper oil pipe. The lower end of the hydraulic cylinder is connected to the short joint of the lower oil pipe through the lower joint of the cylinder, and the lower sealing sleeve is set at the center of the lower joint of the cylinder. 3. A special downhole hydraulic motor for oil production according to claim 1, characterized in that the lower end of the lower hollow piston rod is connected to a hollow tie rod joint, and a hole is opened on the side of the hollow tie rod joint, and the hole communicates with the inside of the lower hollow piston rod and the lower oil pipe Shorted internally. 4. The special downhole hydraulic motor for oil production according to claim 1, characterized in that the longitudinal axes of the upper hollow piston rod, the piston body and the lower hollow piston rod are on the same straight line.