CN219299287U - Sucker rod load unloader - Google Patents

Abstract

The utility model provides a sucker rod load reducer, the pump footpath of going up the pump barrel is less than the pump footpath of lower pump barrel, goes up pump barrel, reducing pump barrel joint, lower pump barrel and connects gradually, goes up piston rod, reducing piston joint, lower hollow piston connect gradually, go up the piston rod and penetrate in going up the pump barrel, lower hollow piston is in lower pump barrel, the upper portion of going up the piston rod has the sucker rod joint, forms the breathing chamber between the inner wall of going up piston rod and lower pump barrel, reducing piston joint has the UNICOM groove, the breathing chamber communicate with each other through the inside of UNICOM groove and lower hollow piston, the leakage liquid between upper piston rod and the upper pump barrel and between lower hollow piston and the lower pump barrel can flow away downwards through the inside of lower hollow piston, lower pump barrel is put into the outer tube, the lower part that reducing pump barrel connects is connected in the upper portion of outer tube, has the vertical runner on the lateral wall that reducing pump barrel connects, form the annular passage between lower pump barrel and the outer tube, vertical runner communicate with the annular passage, eliminated the influence of sleeve pressure to its load reducing effect.

Description

Sucker rod load unloader

Technical Field

The utility model relates to an oil pumping device for an oil field, in particular to a sucker rod unloader.

Background

The reciprocating sucker rod pumping device for oil field includes pumping unit, sucker rod, oil pump and oil pipe, and the pumping unit is installed on ground and in the shaft of oil well. In the pumping of deep wells and ultra-deep wells by adopting a reciprocating sucker rod pump, the load born by a pumping unit and a sucker rod is large.

0003. For this reason, technicians have studied sucker rod relief devices which are installed on tubing, sucker rods between the wellhead and the pump to reduce the sucker rod load and the pump load above the installation location. The load relief device of the sucker rod utilizes the pressure difference between the oil pipe and the casing at the installation position to generate the load relief effect, the load relief effect is influenced by the pressure of the casing, and when the liquid level of the casing is high, the load relief effect is poor, for example, the pressure of the casing is not reduced when the casing is at the wellhead (the situation occurs when the casing is doped with thin).

Disclosure of Invention

The utility model aims to design a sucker rod load reducer, eliminate the influence of the casing pressure on the load reducing effect of the sucker rod load reducer, and reduce the load of the sucker rod on the installation position of the sucker rod load reducer.

The purpose of the utility model is realized in the following way: the device comprises an upper piston rod, an upper pump cylinder, a reducing pump cylinder connector, a reducing piston connector, a lower hollow piston, a lower pump cylinder and an outer tube, wherein the pump diameter of the upper pump cylinder is smaller than that of the lower pump cylinder, the upper pump cylinder, the reducing pump cylinder connector and the lower pump cylinder are sequentially connected, the upper piston rod penetrates into the upper pump cylinder, the lower hollow piston is positioned in the lower pump cylinder, the upper part of the upper piston rod is provided with an oil pumping rod connector, the upper piston rod is sealed in a matched manner with the upper pump cylinder, the lower hollow piston is sealed in a matched manner with the lower pump cylinder, a breathing cavity is formed between the upper piston rod and the inner wall of the lower pump cylinder due to the difference of diameters of the upper piston rod and the lower pump cylinder, the reducing piston connector is provided with a communication groove, the breathing cavity is communicated with the inside of the lower hollow piston through the communication groove, leakage liquid between the upper piston rod and the upper pump cylinder and between the lower hollow piston and the lower pump cylinder can flow downwards through the inside of the lower hollow piston, the lower pump cylinder is placed into the outer tube, the lower pump cylinder connector is connected with the upper part of the outer tube, the side wall of the upper piston rod is provided with an oil pumping rod connector, the side wall of the reducing pump cylinder connector is provided with a vertical channel, and the annular channel is communicated with the annular channel of the oil pumping channel is arranged in the annular channel.

The beneficial effects of the utility model are as follows: the utility model is used with the hollow oil pump, the inlet pressure of the hollow oil pump is almost zero when the hollow oil pump works, the upper end surface of the lower hollow piston is communicated with the inlet of the hollow oil pump, the influence of the sleeve pressure on the load reducing effect of the hollow oil pump is eliminated, and when the sleeve pressure is high and the sleeve is doped with thin, the utility model can generate larger upward thrust at the mounting position of the utility model, lighten the load of the sucker rod above the utility model, and can be matched with the process of doping thin and reducing the viscosity on the sleeve pump to extract thick oil.

Drawings

Fig. 1 is an assembly view of an embodiment of the present utility model.

Description of the embodiments

An embodiment of the present utility model will be described with reference to fig. 1.

As shown in fig. 1, the embodiment of the utility model comprises an upper piston rod 2, an upper pump cylinder 3, a reducing pump cylinder joint 4, a reducing piston joint 5, a lower hollow piston 6, a lower pump cylinder 7 and an outer pipe 8, wherein the pump diameter of the upper pump cylinder 3 is smaller than that of the lower pump cylinder 7, the upper pump cylinder 3, the reducing pump cylinder joint 4 and the lower pump cylinder 7 are sequentially connected, the upper piston rod 2, the reducing piston joint 5 and the lower hollow piston 6 are sequentially connected, the upper piston rod 2 penetrates into the upper pump cylinder 3, the lower hollow piston 6 is positioned in the lower pump cylinder 7, the upper part of the upper piston rod 2 is provided with an oil pumping rod joint 1, the upper piston rod 2 is matched and sealed with the upper pump cylinder 3, the lower hollow piston 6 is matched and sealed with the lower pump cylinder 7, a breathing cavity 7-1 is formed between the upper piston rod 2 and the inner wall of the lower pump cylinder 7 due to the difference of the diameters of the upper piston rod and the lower pump cylinder 7, the breathing cavity 7-1 is arranged on the reducing piston joint 5, the breathing cavity 7-1 is communicated with the inside of the lower hollow piston 6 through the communicating groove 5-1, the upper piston rod 2 and the upper piston 3 and the lower piston 6 penetrate into the upper pump cylinder 3, the lower hollow cylinder 6 and the lower hollow piston 6 are sequentially connected with the lower hollow piston 6, the lower hollow piston 6 is positioned in the hollow piston 4 through the annular space, the annular space between the upper piston rod 2 and the lower piston rod and the lower piston 6 and the lower piston 7 form a vertical channel 4-8 and the outer pipe 4 is connected with the outer pipe 4 through the annular channel 4 and the annular channel 4 is arranged at the annular part and the annular channel 1 and the lower channel 4 is connected with the lower channel 1 and the lower channel 4 and the lower side channel 4 is the lower end channel is arranged in the annular channel and the lower end channel has the annular channel.

The utility model is arranged in the middle area of the oil extraction pipe column and is matched with a hollow oil pump, the lower part of a lower hollow piston 6 is connected with the upper part of a reciprocating motion part of the hollow oil pump, the lower part of an outer pipe 8 is connected with the upper part of a fixed part of the hollow oil pump, the inside of the lower hollow piston 6 is communicated with an inlet of the hollow oil pump through a central pipe on the hollow oil pump, and the pressure of the upper end face of the lower hollow piston 6 is basically zero under the working of the hollow oil pump, namely: the relief effect of the present utility model is independent of the casing pressure. Therefore, the utility model can generate upward thrust at the installation position of the pipe column, thereby reducing the load of the sucker rod and the pumping unit.

When the thick oil well implements the thin oil mixing process, the mixed thin oil fills the sleeve, and a large liquid column pressure is formed in the sleeve, for the utility model, the liquid column pressure formed by the mixed thin oil in the sleeve can not act on the upper end face of the lower hollow piston 6, and the pressure of the upper end face of the lower hollow piston 6 is still basically zero, so that the utility model can not influence the load reducing effect when the sleeve is mixed with thin, viscosity-reduced and thick oil.

When the utility model and the hollow oil pump are both arranged in the middle area of the oil extraction pipe column, the inside of the lower hollow piston 6 is communicated with the inlet of the hollow oil pump through the central pipe on the hollow oil pump, so that leakage liquid generated by gaps between the upper piston rod and the upper pump cylinder 3 and between the lower hollow piston 6 and the lower pump cylinder (7) flows back to the inlet of the hollow oil pump and is recovered by the hollow oil pump.

The hollow oil pump has a structure like the structure of the electric heating thickened oil pump disclosed in SY/T7083-2016, various structures of the hollow oil pump, and the hollow oil pump with a central passage and a full or non-full path of a circulating oil pumping passage can be matched with the utility model.

The matching sealing of the piston (rod) and the pump cylinder means meeting the requirements specified in the GB/T17307 standard. The pump diameter refers to the inner diameter of the pump barrel of the oil pump.

Claims (1)

1. The utility model provides a sucker rod load shedding device which characterized in that: comprises an upper piston rod (2), an upper pump cylinder (3), a reducing pump cylinder joint (4), a reducing piston joint (5), a lower hollow piston (6), a lower pump cylinder (7) and an outer tube (8), wherein the pump diameter of the upper pump cylinder (3) is smaller than that of the lower pump cylinder (7), the upper pump cylinder (3), the reducing pump cylinder joint (4) and the lower pump cylinder (7) are sequentially connected, the upper piston rod (2), the reducing piston joint (5) and the lower hollow piston (6) are sequentially connected, the upper piston rod (2) penetrates into the upper pump cylinder (3), the lower hollow piston (6) is positioned in the lower pump cylinder (7), the upper part of the upper piston rod (2) is provided with a sucker rod joint (1), the upper piston rod (2) is matched and the upper pump cylinder (3), the lower hollow piston (6) is matched and sealed with the lower pump cylinder (7), a breathing cavity (7-1) is formed between the upper piston rod (2) and the inner wall of the lower pump cylinder (7) due to the diameter difference of the two, a communication groove (5-1) is formed on the reducing piston joint (5), the breathing cavity (7-1) is communicated with the inner part of the hollow piston (6-1), the device comprises an upper piston rod (2), an upper pump cylinder (3) and a lower hollow piston (6) and a lower pump cylinder (7), wherein leakage liquid between the upper piston rod and the upper pump cylinder (3) and between the lower hollow piston (6) and the lower pump cylinder (7) can flow downwards through the inside of the lower hollow piston (6), the lower pump cylinder (7) is placed in an outer pipe (8), the lower part of a reducing pump cylinder connector (4) is connected to the upper part of the outer pipe (8), a vertical flow passage (4-1) is formed in the side wall of the reducing pump cylinder connector (4), an annular flow passage (8-1) is formed between the lower pump cylinder (7) and the outer pipe (8), the vertical flow passage (4-1) is communicated with the annular flow passage (8-1), and the vertical flow passage (4-1) is an outflow passage of well liquid which is arranged on pumping equipment at the lower part of a pumping rod load reducer.

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