Electric piston well washing device

Abstract

The invention belongs to well washing devices, and particularly relates to an electric piston well washing device. The electric piston well washing device comprises an armored cable, and a control assembly and an electric cylinder assembly are sequentially arranged at the front end of the armored cable. The device has the remarkable effects that the electric piston is mounted at the bottom of the well body (namely the position of the filter), and after the electric piston is mounted and fixed, the electric cylinder drives the piston to reciprocate up and down at the position of the filter according to the speed and frequency set by a ground control system, so that the purposes of cleaning and permeation enhancement are achieved, and the acting force is concentrated in a target area; the electric cylinder only drives the piston to work at the position of the filter, all the other accessories are in a standing state, and the device has the remarkable effects of being energy-saving, efficient, good in cleaning effect, high in intrinsic safety degree and capable of achieving cloud intelligent control.

Description

Technical Field

[0001] The invention belongs to a well flushing device, and particularly relates to an electric piston well flushing device. Background Art

[0002] In the process of exploiting underground minerals using process wells such as in oil, geothermal energy, and in-situ leaching of uranium, when the process well is built or after running for a certain period of time, the part where the filter is installed (i.e., the part facing the ore layer, where there are mesh holes communicating with the ore layer and is the migration channel of the ore liquid) will be blocked by sundries such as sediment. Therefore, during the production process, this part needs to be frequently cleaned to increase the flow rate of the ore liquid. Currently, there are two piston well flushing methods:

[0003] One is to use a winch at the wellhead to drive a rigid connecting rod equal in length to the wellbore to reciprocate up and down in the well. The piston at the lowest end of the connecting rod impacts the water at the filter part, forming an alternating positive and negative pressure field. The water waves formed thereby act on the filter, peeling off the sediment and other blockages around the filter, thus opening up the channel connecting the filter and the ore layer and enabling the smooth migration of the ore liquid for exploitation. The advantage of this well flushing method is good well flushing effect, but the disadvantages are that the well flushing equipment is bulky, energy consumption is large, there are many operators, and the operation safety risk is high.

[0004] Another piston well flushing method is to use a winch at the wellhead to drive a steel wire rope equal in length to the wellbore to reciprocate up and down in the well. The piston suspended at the lower end of the steel wire rope impacts the filter part, and its principle is similar to the first method. The advantage of this method is that the equipment is simpler than the first one, and the up and down movement is driven by the steel wire rope. The disadvantage is that since the downward movement depends on the self-weight of the steel wire rope and the piston, due to the limitation of the wellbore space, the piston size and counterweight are insufficient, resulting in insufficient positive pressure formed during the downward movement and the well flushing effect not being ideal. In addition, the up and down movement frequency is very high, so the energy consumption and the loss of the steel wire rope are the same. At the same time, the winch needs to be manually operated, there is a certain safety risk. Summary of the Invention

[0005] Aiming at the defects of the prior art, the invention provides an electric piston well flushing device.

[0006] The invention is realized as follows: An electric piston well flushing device, which includes an armored cable, and a control component and an electric cylinder component are sequentially arranged at the front end of the armored cable.

[0007] For an electric piston well flushing device as described above, the control component includes a motor push and lean assembly. The center of the motor push and lean assembly is connected to a push and lean pull rod, and an arc-shaped brake block is connected to the push and lean pull rod.

[0008] For an electric piston well flushing device as described above, the shape of the arc-shaped brake block matches the shape of the well wall.

[0009] An electric piston well flushing device as described above, wherein the electric cylinder assembly includes an electric cylinder, the electric cylinder is provided with an electric cylinder push rod, and a piston is provided at the front end of the electric cylinder push rod.

[0010] The remarkable effect of the present invention is that it overcomes the problem of the current piston well flushing method which uses a huge ground winch to drive the piston to reciprocate up and down in the well by towing a heavy pull rod as long as the well body (or towing a steel wire rope as long as the well body to drive the piston to reciprocate up and down in the well). A large amount of power consumption is used for towing the pull rod or steel wire rope as long as the well body, and in the whole process, only the reciprocating motion of the piston head at the lower end does useful work. This traditional method is time-consuming, laborious and has a high safety risk. While adopting the present invention, the electric piston is installed at the bottom of the well body (i.e., the filter position). After installation and fixation, the electric cylinder drives the piston to reciprocate up and down at the filter position according to the speed and frequency set by the ground control system, so as to achieve the purpose of cleaning and increasing permeability. Its acting force is concentrated in the target area. The electric cylinder only drives the piston to work at the filter part, and all the other accessories are in a static state, having the remarkable effects of energy saving, high efficiency, good cleaning effect, high intrinsic safety degree and realizing cloud intelligent control. Description of the Drawings

[0011] Figure 1 Overall structure diagram of an electric piston well flushing device

[0012] Figure 2 Working principle diagram of an electric piston well flushing device

[0013] In the figure: 1 armored cable, 2 armored cable steel wire, 3 armored cable power supply line, 4 motor push and lean assembly, 5 push and lean pull rod, 6 arc brake block, 7 electric cylinder, 8 electric cylinder push rod, 9 piston, 10 filter, 11 water (oil) well. Detailed Embodiment

[0014] An electric piston well flushing device is lowered to the filter part with a light winch or manually with a lifting cable attached, and then through the ground control device, the robotic arm on the upper part of the electric piston is pushed open to firmly fix the whole device on the inner wall of the well pipe. Then, through the wellhead controller, the electric piston installed on the wellbore reciprocates up and down at a predetermined speed and working frequency to clean the filter part.

[0015] 1 Armored cable: used to transport the electric piston well flushing device to the well flushing position and provide power supply for the device.

[0016] 2 Armored cable steel wire: used to carry the device.

[0017] 3 Armored cable power supply line: used to supply power for the device.

[0018] 4 Motor pushing and leaning assembly: used for pushing and retracting the pushing arm.

[0019] 5 Pushing and leaning pull rod: used to drive the movement of the arc-shaped brake block.

[0020] 6 Arc-shaped brake block: used to fix the device on the wellbore.

[0021] 7 Electric cylinder: used to drive the movement of the electric cylinder push rod.

[0022] 8 Electric cylinder push rod: used to drive the piston to reciprocate up and down in the wellbore.

[0023] 9 Piston: used to generate water waves, form positive and negative pressure fields, and clean and increase the permeability of the wellbore filter part.

[0024] 10 Filter: used to connect the ore layer outside the well with the space inside the well, and is the channel for the operation of the ore liquid.

[0025] 11 Water (oil) well: a project built for mining ore liquid, and is the working object for the cleaning and increasing permeability of this device.

[0026] An electric piston well washing device is implemented with the help of the following existing devices:

[0027] Water (oil) well: It is a project built for mining ore liquid. After the drill rig drills to the ore layer, the well pipe is installed and cemented. A filter is installed at the position facing the ore layer. The filter is the channel for the operation of the ore liquid. Before production, the filter part needs to be cleaned to connect the ore layer outside the well with the space inside the well to ensure the smooth migration of the ore liquid and achieve the expected output.

[0028] The usage process of this device is roughly as follows:

[0029] Step 1: Lower this device to the filter 10 part of the water (oil) well 11 through the armored cable 1, and fix the armored cable steel wire 2 at the wellhead to suspend this device at the target position;

[0030] Step 2: Supply power to the motor pushing and leaning assembly 4 through the armored cable power supply line 3; the screw of the motor pushing and leaning assembly 4 starts to rotate, pushing the pushing and leaning pull rod 5 to move downward, so that the arc-shaped brake blocks 6 evenly distributed in the annular space (a total of 4, one every 90°) radially extend and push and squeeze against the well wall, firmly fixing the device on the well wall without moving;

[0031] Step 3: Start the electric cylinder 7 through the ground control system, so that the electric cylinder push rod 8 reciprocates up and down at a set speed and frequency. Then the piston 9 installed at the lower end of the electric cylinder push rod 8 also reciprocates up and down. The reciprocating movement of the piston 9 pushes the water at the filter 10 part to generate colloid positive and negative water pressures, generating a scouring force on the filter 10, and further achieving the purpose of cleaning and increasing the permeability of the water (oil) well 11, thereby improving the production capacity of this well.

[0032] Step 4: After the well washing is completed, stop the operation of the electric cylinder 7, and operate the motor of the push and lean assembly 4 through the ground system to reverse the screw, so that the arc-shaped brake block 6 retracts radially and disengages from the inner wall of the well pipe, and the device is released from fixation. Then, lift the armored cable 1 to lift the device out of the well.

Claims

1. An electric piston well flushing device, characterized in that: It includes an armored cable (1), and a control component and a cylinder component are sequentially arranged at the front end of the armored cable (1).

2. The electric piston well flushing device according to claim 1, characterized in that: The control component includes a motor pushing assembly (4). The center of the motor pushing assembly (4) is connected to a pushing rod (5), and an arc-shaped brake block (6) is connected to the pushing rod (5).

3. The electric piston well flushing device according to claim 2, characterized in that: The shape of the arc-shaped brake block (6) matches the shape of the wellbore wall.

4. The electric piston well flushing device according to claim 3, characterized in that: The cylinder component includes a cylinder (7). A cylinder push rod (8) is arranged on the cylinder (7), and a piston (9) is arranged at the foremost end of the cylinder push rod (8).

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