Automatic Exclusion Method, System and Storage Medium for Sand Jamming of All-Metal Tapered Screw Pump

Abstract

The embodiment of the present invention discloses a method, a system and a storage medium for automatically removing sand jams in a fully metal conical screw pump. This method can not only accurately monitor whether the fully metal conical screw pump has a sand jam according to the real-time torque of the rotor of the fully metal conical screw pump, and safely and quickly unload the torque when a sand jam occurs to achieve automatic removal of the sand jam, but also realize automatic prevention and removal of sand jams and sand burial according to the set equipment shutdown and startup logic, effectively and comprehensively solve the problem of sand jams and sand burial in screw pumps, greatly promote the intelligent development of oil production equipment, and is suitable for popularization and application.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of intelligent oil exploitation, and in particular, to a method, a system and a storage medium for automatically removing sand jams of a full-metal conical screw pump. Background Art

[0002] In the field of oil exploitation, there are generally two types of oil exploitation equipment, one is a pumping unit, and the other is a screw pump. In recent years, the screw pump oil production method has been gradually popularized. However, neither the full-metal screw pump nor the screw pump with a rubber stator can solve the problems of sand jams or sand burial. Sand jams and sand burial are inevitable phenomena in the process of oil exploitation, especially in viscous oil wells, which generally occur during pump inspection or maintenance shutdown. A whole pipe of oil sand gradually precipitates after shutdown, resulting in local sand jams or overall sand burial of the stator and rotor of the screw pump. In severe cases, the pump body is buried in sand for dozens of meters upwards. At present, both the full-metal screw pump and the screw pump with a rubber stator are designed with a cylindrical structure. Although the rubber of the screw pump with a rubber stator has elasticity and is not easily sand-jammed, it cannot avoid sand jams. Once sand jams or sand burial occur, when the situation is not serious, a crane is needed for operation, and when it is a little more serious, a work vehicle is needed for operation, which brings additional time costs, operation costs and equipment loss costs to oil production; moreover, if a sand surge phenomenon occurs during production to form sand jams or sand burial, it is extremely easy for the main motor of the oil production equipment to stop due to instantaneous torque overload. At this time, the instantaneous release of torque causes the sucker rod to break off or even the bearing box to fly off (i.e., the "flywheel phenomenon"), posing a great potential safety hazard.

[0003] The above problems need to be solved urgently. Summary of the Invention

[0004] To solve the related technical problems, the present invention provides a method, a system and a storage medium for automatically removing sand jams of a full-metal conical screw pump to solve the problems mentioned in the above background art section.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, the embodiments of the present invention provide a method for automatically removing sand jams of a full-metal conical screw pump, including:

[0007] Setting a normal exploitation torque range and a torque alarm limit value for the full-metal conical screw pump;

[0008] Judging whether the real-time torque of the rotor of the full-metal conical screw pump is higher than the upper limit value of the normal exploitation torque range;

[0009] If the judgment result is yes, then judging whether the real-time torque of the rotor of the full-metal conical screw pump is higher than the torque alarm limit value;

[0010] If the real-time torque is lower than the torque alarm limit, the height of the dynamic liquid level is used to determine whether the liquid supply is sufficient. If it is sufficient, the liquid sand content is determined to be overloaded. The central control system controls the lifting system to execute the torque overload procedure to discharge sand until the torque returns to the normal mining torque range, and the sand jam is removed.

[0011] If the real-time torque is higher than the torque alarm limit, the central control system will issue an alarm and directly determine that sand jam has occurred. It will control the lifting system to execute the torque forced unloading procedure to discharge sand until the torque returns to the normal mining torque range and the sand jam is removed.

[0012] As an optional implementation, the method for automatically removing sand jams in a full-metal conical screw pump further includes:

[0013] If the real-time torque of the all-metal conical screw pump rotor is momentarily overloaded, the central control system automatically starts the shutdown procedure, lifts the machine to the highest value, and simultaneously starts the ultimate safety procedure to release the torque until the torque returns to zero.

[0014] As an optional implementation, the central control system controls the lifting system to execute a torque forced unloading procedure to discharge sand until the torque is restored to the normal mining torque range, including:

[0015] The central control system sends out a command to force the lifting system to rise. When the weighing system shows that the maximum value of the full oil pipe has been reached, the weight begins to drop, the stator and rotor of the all-metal conical screw pump disengage, and the drainage channel around the rotor will open, allowing the full oil pipe to drain until the torque is unloaded. When the torque returns to the normal mining torque range, the central control system instructs the lifting system to resume trial mining at the last normal mining position until it is confirmed that all data have reached the set indicators before formal mining.

[0016] As an optional implementation, when the torque returns to the normal mining torque range, the central control system instructs the lifting system to resume the position of the last normal mining for trial mining, and formal mining is not carried out until all data are confirmed to meet the set indicators, which also includes:

[0017] If the torque continues to be overloaded after mining resumes, the central control system controls the lifting system to repeat the ascent several times according to a preset program, wherein the position of each repeated ascent is higher than the previous ascent by a set value until the torque returns to normal.

[0018] As an alternative implementation, the position of each repeated upward movement is higher than the previous upward movement by a set value, where the set value is the height value adjusted in one adjustment cycle; wherein, according to the pitch of each turn of the screw thread of the adjusting bolt of the adjusting rod and the pitch of the screw thread that the adjusting bolt can be rotated by the lifting system for one lift, the number of lifts of the lifting system required for the adjusting bolt of the adjusting rod to be screwed one turn is calculated, and the adjustment process of the adjusting bolt of the adjusting rod for each turn of screwing is set as one adjustment cycle.

[0019] As an alternative implementation, starting the ultimate safety program to release torque until the torque returns to zero includes:

[0020] A torque safety system is set up, installed on the reverse side of the control cabinet of the central control system, which consists of n resistors; after the ultimate safety program is started, the resistors use resistance to prevent the motor from rotating at high speed in reverse and control the reverse rotation at a safe speed, so that when the torque is unloaded, a reaction force is formed with the high torque transmitted from the well, making the sucker rod tighter and preventing it from disengaging until the torque returns to zero.

[0021] As an alternative implementation, the automatic sand jamming removal method for the all-metal conical screw pump further includes:

[0022] When the all-metal conical screw pump is ready to stop, the central control system does not control the oil production equipment to stop immediately. Instead, it first commands the lifting system to rise by a preset height to open the clearance channel between the stator and rotor of the all-metal conical screw pump. At the same time, the rotation speed is decreased to a set rotation speed within a set time according to the set downward logic, so that the torque is unloaded and the full pipe of liquid is unloaded until the torque returns to the set shutdown safety value; when the torque returns to the set shutdown safety value and the change range is within the set fluctuation range, the central control system determines safety and controls the oil production equipment to stop, realizing the prevention of sand jamming and sand burial during shutdown.

[0023] As an alternative implementation, the automatic sand jamming removal method for the all-metal conical screw pump further includes:

[0024] When the all-metal conical screw pump is ready to start, the central control system does not directly control the oil production equipment to start. Instead, it first determines whether the driving motor can accelerate the speed to the preset self-check speed within the set time and determines whether the torque is within the set normal production torque range during this period. If the driving motor can accelerate the speed to the preset self-check speed within the set time and the torque is within the set normal production torque range during this period, the central control system determines that the start is safe and instructs the oil production equipment to start. If the torque exceeds the upper limit value of the set normal production torque range during the period when the driving motor accelerates the speed to the preset self-check speed within the set time, the central control system controls the lifting system to execute the torque overload program to remove sand until the torque returns to the normal production torque range until the central control system determines that the start is safe.

[0025] In a second aspect, an embodiment of the present invention provides an all-metal conical screw pump sand jamming automatic elimination system, which includes but is not limited to a lifting system, a position controller, and a central control system, and uses the all-metal conical screw pump sand jamming automatic elimination method described in the first aspect above to complete the automatic elimination and prevention of the all-metal conical screw pump sand jamming.

[0026] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, they are used to implement the all-metal conical screw pump sand jamming automatic elimination method described in any item of the first aspect.

[0027] The technical solution of the embodiment of the present invention can not only accurately monitor whether the all-metal conical screw pump is sand jammed according to the real-time torque of the rotor of the all-metal conical screw pump, and safely and quickly unload the torque when sand jamming occurs to realize automatic sand jamming elimination, but also realize automatic prevention and elimination of sand jamming and sand burial according to the set equipment shutdown and start logic, effectively and comprehensively solve the problem of sand jamming and sand burial of the screw pump, greatly promote the intelligent development of oil production equipment, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the background technology and embodiment description of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0029] Figure 1 It is a schematic flow chart of the all-metal conical screw pump sand jamming automatic elimination method provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0030] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Embodiment 1

[0032] As Figure 1 shown Figure 1 It is a schematic flow diagram of the automatic sand jamming removal method for a full-metal conical screw pump provided by an embodiment of the present invention.

[0033] In this embodiment, the automatic sand jamming removal method 100 for a full-metal conical screw pump includes:

[0034] S101. Set the normal mining torque range and torque alarm limit value of the full-metal conical screw pump;

[0035] S102. Determine whether the real-time torque of the rotor of the full-metal conical screw pump is higher than the upper limit value of the normal mining torque range;

[0036] S103. If the judgment result is yes, then determine whether the real-time torque of the rotor of the full-metal conical screw pump is higher than the torque alarm limit value;

[0037] S104. If the real-time torque is lower than the torque alarm limit value, then determine whether the liquid supply is sufficient according to the height of the dynamic liquid level. If it is sufficient, it is determined that the sand content in the liquid is overloaded, and the central control system controls the lifting system to execute the torque overload program to remove sand until the torque returns to the normal mining torque range, and the sand jamming removal is completed;

[0038] S105. If the real-time torque is higher than the torque alarm limit value, the central control system issues an alarm and directly determines that sand jamming has occurred, and controls the lifting system to execute the torque forced unloading program to remove sand until the torque returns to the normal mining torque range, and the sand jamming removal is completed.

[0039] Exemplarily, in this embodiment, the full-metal conical screw pump is installed underground and includes a stator and a rotor. The stator is provided with an internal thread surface, and the rotor is installed inside the stator and is provided with an external thread surface that cooperates with the internal thread surface. Both the internal thread surface and the external thread surface are conical spiral structures and have the same taper.

[0040] It should be noted that since the downhole conditions are relatively complex and the liquid composition has a significant impact on torque, the all-metal conical screw pump divides all oil wells into two major categories: heavy oil wells and normal production wells according to the torque limit of the driving motor, and further divides the well depth into two major categories: within 800 meters and above 800 meters.

[0041] Exemplarily, in this embodiment, for normal production wells within 800 meters, the torque value during normal production is generally set in the range of 80 - 600 N. An alarm is issued when it is lower than the lower limit value, and an alarm is also issued when it is higher than the upper limit value; the torque alarm limit is set, for example, at 800 N. When the 800 N limit is exceeded, an alarm is issued and the torque is forcibly unloaded.

[0042] Exemplarily, in this embodiment, for normal production wells above 800 meters, the torque value during normal production is generally set in the range of 100 - 800 N. An alarm is issued when it is lower than the lower limit value, and an alarm is also issued when it is higher than the upper limit value; the torque alarm limit is set, for example, at 1000 N. When the 1000 N limit is exceeded, an alarm is issued and the torque is forcibly unloaded.

[0043] Exemplarily, in this embodiment, for heavy oil wells within 800 meters, the torque value during normal production is generally set in the range of 100 - 900 N. An alarm is issued when it is lower than the lower limit value, and an alarm is also issued when it is higher than the upper limit value; the torque alarm limit is set, for example, at 1000 N. When the 1000 N limit is exceeded, the system will issue an alarm and forcibly unload the torque.

[0044] Exemplarily, in this embodiment, for heavy oil wells above 800 meters, the torque value during normal production is generally set in the range of 120 - 900 N. An alarm is issued when it is lower than the lower limit value, and an alarm is also issued when it is higher than the upper limit value; the torque alarm limit is set to issue an alarm and forcibly unload the torque before reaching 99% of the limit value (the torque limit of the motor is generally between 1050 - 1500 N).

[0045] In the all-metal conical screw pump sand sticking automatic elimination method 100 provided by the embodiment of the present invention, the all-metal conical screw pump changes the cylindrical structure of the traditional screw pump to a conical structure that is larger at the top and smaller at the bottom. Whether in a static state or a high-speed operation state, it can freely move up and down with the cooperation of the lifting system, achieving a more flexible and effective sand sticking prevention function than the rubber stator. The all-metal conical screw pump sand sticking automatic elimination method provided by the embodiment of the present invention can accurately monitor whether the all-metal conical screw pump has sand sticking according to the real-time torque of the rotor of the all-metal conical screw pump, and safely and quickly unload the torque when sand sticking occurs, realizing automatic elimination of sand sticking, and effectively and comprehensively solving the problem of sand sticking and sand burying of the screw pump.

[0046] Embodiment Two

[0047] In this embodiment, the all-metal conical screw pump sand sticking automatic elimination method includes:

[0048] S201. Set the normal mining torque range and torque alarm limit value of the all-metal conical screw pump;

[0049] S202. Determine whether the real-time torque of the rotor of the all-metal conical screw pump is higher than the upper limit value of the normal mining torque range;

[0050] S203. If the judgment result is yes, then determine whether the real-time torque of the rotor of the all-metal conical screw pump is higher than the torque alarm limit value;

[0051] S204. If the real-time torque is lower than the torque alarm limit value, then determine whether the liquid supply is sufficient according to the height of the dynamic liquid level. If it is sufficient, it is determined that the sand content in the liquid is overloaded. The central control system controls the lifting system to execute the torque overload program to remove sand until the torque returns to the normal mining torque range and the sand jamming is removed;

[0052] S205. If the real-time torque is higher than the torque alarm limit value, the central control system issues an alarm and directly determines that sand jamming has occurred, and controls the lifting system to execute the torque forced unloading program to remove sand until the torque returns to the normal mining torque range and the sand jamming is removed.

[0053] Exemplarily, in this embodiment, the all-metal conical screw pump is installed underground and includes a stator and a rotor. The stator is provided with an internal thread surface, and the rotor is installed inside the stator and is provided with an external thread surface that cooperates with the internal thread surface. Both the internal thread surface and the external thread surface are conical spiral structures and have the same taper.

[0054] Exemplarily, in this embodiment, the normal mining torque range and torque alarm limit of the all-metal conical screw pump are set as follows: Since the downhole conditions are relatively complex and the liquid composition has a significant impact on the torque, the all-metal conical screw pump divides all oil wells into two categories: heavy oil wells and normal production wells according to the torque limit of the driving motor, and further divides the well depth into two categories: within 800 meters and above 800 meters. Exemplarily, for normal production wells within 800 meters in this embodiment, the torque value during normal mining is generally set in the range of 80 - 600 N. An early warning is issued when it is lower than the lower limit value, and an early warning is also issued when it is higher than the upper limit value; the torque alarm limit is set to 800 N for example. An alarm is issued and the torque is forcibly unloaded when it exceeds the 800 N limit. Exemplarily, for normal production wells above 800 meters in this embodiment, the torque value during normal mining is generally set in the range of 100 - 800 N. An early warning is issued when it is lower than the lower limit value, and an early warning is also issued when it is higher than the upper limit value; the torque alarm limit is set to 1000 N for example. An alarm is issued and the torque is forcibly unloaded when it exceeds the 1000 N limit. Exemplarily, for heavy oil wells within 800 meters in this embodiment, the torque value during normal mining is generally set in the range of 100 - 900 N. An early warning is issued when it is lower than the lower limit value, and an early warning is also issued when it is higher than the upper limit value; the torque alarm limit is set to 1000 N for example. The system will issue an alarm and forcibly unload the torque when it exceeds the 1000 N limit. Exemplarily, for heavy oil wells above 800 meters in this embodiment, the torque value during normal mining is generally set in the range of 120 - 900 N. An early warning is issued when it is lower than the lower limit value, and an early warning is also issued when it is higher than the upper limit value; the torque alarm limit is set to 99% of the limit value (the torque limit of the motor is generally between 1050 - 1500 N). An alarm is issued and the torque is forcibly unloaded before reaching the limit value.

[0055] Exemplarily, in this embodiment, it is judged whether the real-time torque of the rotor of the all-metal conical screw pump is higher than the upper limit value of the normal mining torque range; if the judgment result is yes, then it is judged whether the real-time torque of the rotor of the all-metal conical screw pump is higher than the torque alarm limit; if the real-time torque is lower than the torque alarm limit, then it is judged whether the liquid supply is sufficient according to the height of the dynamic liquid level. If it is sufficient, it is determined that the sand content in the liquid is overloaded, and the central control system controls the lifting system to execute the torque overload program to remove sand until the torque returns to the normal mining torque range and the sand sticking is eliminated, including:

[0056] When the torque is higher than the upper limit of the normal production torque range, the weighing system first converts the height of the downhole dynamic liquid level according to the weight of the entire pipe oil to determine whether the liquid supply is insufficient. If so, the optimal constant-speed production volume of the current liquid level is automatically calculated to appropriately reduce the liquid output to prevent dry production after the liquid level returns to zero. If the liquid supply is sufficient, it is determined that the torque increase is caused by the overload of liquid sand content. The central control system performs automatic sand discharge according to the data detected at the wellhead and the preset torque overload program until the torque returns to normal. Among them, the weighing system converts the height of the dynamic liquid level in the well (the height from the ground to the liquid level) according to the weight of the entire pipe of oil, including: according to the heaviest display (static) of the weighing system during the commissioning of the oil production equipment, confirm the net weight (weight including the buoyancy of the submerged liquid) of all the equipment (transmission gear box, elevator, sucker rod, rotor) borne by the weighing system; according to the heaviest display (dynamic, including full pipe of liquid) of the weighing system during the production of the oil production equipment, confirm the dynamic net weight (including the buoyancy of the submerged liquid) of the equipment during production; dynamic net weight - static net weight = liquid lifting net weight (dynamic and static submerged buoyancy cancel each other out), liquid lifting net weight ÷ liquid net weight per meter = dynamic liquid level height.

[0057] Exemplarily, in this embodiment, the central control system controls the lifting system to execute a torque forced unloading procedure to discharge sand until the torque is restored to the normal mining torque range, including:

[0058] The central control system sends out a command to force the lifting system to rise. When the weighing system shows that the maximum value of the full oil pipe has been reached, the weight begins to drop, the stator and rotor of the all-metal conical screw pump disengage, and the drainage channel around the rotor will open, allowing the full oil pipe to drain until the torque is unloaded. When the torque returns to the normal mining torque range, the central control system instructs the lifting system to resume trial mining at the last normal mining position until all data, such as normal torque and non-reversal of the bearing box, are confirmed to meet the set indicators before formal mining.

[0059] If the torque continues to be overloaded after mining resumes, the lifting system will repeat the rise several times according to the preset program, and the position of each repeated rise will be higher than the set value of the previous rise until the torque returns to normal; it should be noted that the set value here is generally set to the height value adjusted by an adjustment cycle, which is convenient for calculating the number of limit switch adjustments.

[0060] Specifically, in this embodiment, the lifting system hard-links the drive bearing box and the sucker rod. In this embodiment, the lifting system belongs to the surface device, which can accurately control the overall lifting of the entire sucker rod and its connecting and attached parts, and can achieve an effective lifting stroke of more than 0 - 2000 mm. This lifting stroke actually refers to the lead screw stroke. In theory, the longer the lead screw is made, the longer the stroke can be, as long as the operation safety can be controlled. The position controller is a downhole device, and its normal installation position is 4 - 10 meters above the upper port of the pump, but it is not limited to this and can be adjusted according to the actual application scenario. The position controller includes a limiter and a regulator; the limiter is the hollow outer cylinder device of the position controller, which is screwed and fixed on the tubing, supports and positions the regulator, and anchors the limiter; the regulator is the core device of the position controller, with its upper and lower ends screwed on the sucker rod, supported and limited by the limiter, and connected to the all-metal conical screw pump rotor through the sucker rod. The lifting system and the regulator are connected into a whole through the sucker rod and lift in unison. In this embodiment, by controlling the lifting movement of the lifting system installed on the wellhead, the regulator is driven by the sucker rod to press against the limiter, and the adjusting rod generates a rotational force under the extrusion of the limiter, thereby converting the up and down movement into a directional screwing movement through the regulator, causing the adjusting bolt of the adjusting rod to be screwed. The screwing of the adjusting bolt raises the position of the all-metal conical screw pump rotor. Repeat the above process until the torque of the all-metal conical screw pump rotor returns to the normal production torque range. Specifically, in this embodiment, according to the height of each thread pitch of the adjusting bolt of the adjusting rod and the number of thread pitches that the adjusting bolt can be rotated by one lift of the lifting system, calculate the number of lifts of the lifting system required for the adjusting bolt of the adjusting rod to be screwed one circle, and set the adjustment process of the adjusting bolt of the adjusting rod being screwed one circle as an adjustment cycle. Exemplarily, in this embodiment, for example, there are 7 pairs of upper and lower teeth for each turn of the screwing bolt of the regulator. Each time the elevator presses down, the teeth move forward one tooth along the inclined plane. When rising, the spring will separate the teeth. Repeat this process. The elevator needs to lift 7 times for the regulator to be screwed one circle. And the pitch of each turn of the thread of the regulator is about 2 mm. Therefore, every time the elevator lifts and lowers 7 times, the rotor rises 2 mm.

[0061] Exemplarily, in this embodiment, the automatic sand jamming removal method for the all-metal conical screw pump further includes: if the real-time torque of the rotor of the all-metal conical screw pump is instantaneously overloaded, the central control system automatically starts the shutdown procedure, the elevator rises to the highest value, and at the same time, the ultimate safety procedure is started to release the torque until the torque returns to zero. The starting of the ultimate safety procedure to release the torque until the torque returns to zero includes: setting up a torque safety system, installed on the reverse side of the control cabinet of the central control system, which consists of n resistors; after the ultimate safety procedure is started, the resistors use resistance to prevent the motor from rotating at high speed in reverse and control the reverse rotation at a safe speed, making it slowly unload the torque and form a reaction force with the high torque transmitted from the wellbore, so that the sucker rod becomes tighter and will not be disengaged until the torque returns to zero.

[0062] Exemplarily, in this embodiment, the automatic sand jamming removal method for the all-metal conical screw pump further includes: when the all-metal conical screw pump is ready to shut down, the central control system does not control the oil production equipment to shut down immediately. Instead, it first instructs the lifting system to rise by a preset height to open the clearance channel between the stator and rotor of the all-metal conical screw pump, and at the same time, the rotational speed is decreased to a set rotational speed within a set time according to a set descending logic to unload the torque and unload the liquid in the full pipe until the torque returns to the set shutdown safety value; when the torque returns to the set shutdown safety value and the change range is within the set fluctuation range, the central control system determines safety and controls the oil production equipment to shut down, realizing the prevention of sand jamming and sand burial during shutdown.

[0063] Specifically, in this embodiment, when the all-metal conical screw pump is ready to shut down, the central control system does not control the oil production equipment to shut down immediately. Instead, it will first instruct the lifting system to rise by more than 100 - 1000 mm according to the shutdown procedure logic to open the clearance channel between the stator and rotor of the all-metal conical screw pump, and at the same time, slowly reduce the rotational speed to 60 revolutions per minute within 5 minutes. While slowly releasing the torque, unload the liquid in the full pipe until the torque returns below 50 N and there is no obvious fluctuation (for example, within 3 - 5 N). Only then will the central control system determine safety and then officially shut down. It should be noted that in practical applications: a. According to the different well depths, the preset shutdown rising height is also different because the sucker rod will have a stretch of 1 - 4 / 10000 under the load-bearing state; b. The mechanical parameters of the lifting stroke of the elevator are different. For example, if the lifting stroke of an elevator is only 500 mm, then the preset shutdown rising height can be at most 250 mm, leaving half of the margin for height adjustment during operation.

[0064] Exemplarily, in the automatic sand jamming elimination method for the all-metal conical screw pump in this embodiment, it further includes: when the all-metal conical screw pump is ready to start, the central control system does not directly control the oil production equipment to start. Instead, it first determines whether the drive motor can accelerate the speed to the preset self-check speed within the set time and determines whether the torque is within the set normal production torque range during this period. If the drive motor can accelerate the speed to the preset self-check speed within the set time and the torque is within the set normal production torque range during this period, the central control system determines that the start is safe and instructs the oil production equipment to start; if the torque exceeds the upper limit value of the set normal production torque range during the period when the drive motor accelerates the speed to the preset self-check speed within the set time, the central control system controls the lifting system to execute the torque overload program to remove sand until the torque returns to the normal production torque range until the central control system determines that the start is safe.

[0065] Specifically, in this embodiment, when clicking to start, the oil production equipment does not start directly. The central control system will first start the self-check program at startup and instruct the motor to accelerate uniformly from 20 revolutions per minute to 100 revolutions per minute within 5 minutes. Generally, it is set that every 10 integers is an acceleration stage, and each acceleration stage rotates 10 circles. During this process, the torque does not exceed the normal production torque range set for each well. After the central control system determines that the start is safe, it will order a formal start.

[0066] In the automatic sand jamming elimination method for the all-metal conical screw pump provided by the embodiment of the present invention, the all-metal conical screw pump changes the cylindrical structure of the traditional screw pump to a conical structure with a larger upper part and a smaller lower part. Whether in a static state or a high-speed operation state, it can, with the cooperation of the lifting system, freely achieve vertical movement and realize a more flexible and effective sand prevention and jamming function than a rubber stator. The automatic sand jamming elimination method for the all-metal conical screw pump provided by the embodiment of the present invention can not only accurately monitor whether the all-metal conical screw pump is sand jammed according to the real-time torque of the rotor of the all-metal conical screw pump, and safely and quickly unload the torque when sand jamming occurs to achieve automatic sand jamming elimination, but also realize the automatic prevention and elimination of sand jamming and sand burial according to the set equipment shutdown and startup logic, effectively and comprehensively solve the problem of sand jamming and sand burial of the screw pump, and greatly promote the intelligent development of oil production equipment, and is suitable for popularization and application.

[0067] Embodiment III

[0068] This embodiment provides an automatic sand jamming elimination system for an all-metal conical screw pump. The system includes, but is not limited to, a lifting system, a position controller, and a central control system, and uses the automatic sand jamming elimination method described in any one of Embodiment 1 or Embodiment 2 above to complete the automatic elimination and prevention of sand jamming of the all-metal conical screw pump.

[0069] In the all-metal conical screw pump sand jamming automatic elimination system provided by the embodiments of the present invention, the all-metal conical screw pump changes the cylindrical structure of the traditional screw pump into a conical structure with a larger upper part and a smaller lower part. Whether in a static state or a high-speed operation state, it can achieve up and down movement freely with the cooperation of the lifting system, and realize a more flexible and effective sand jamming prevention function than the rubber stator. The all-metal conical screw pump sand jamming automatic elimination system provided by the embodiments of the present invention can not only accurately monitor whether the all-metal conical screw pump is sand jammed according to the real-time torque of the rotor of the all-metal conical screw pump, and safely and quickly unload the torque when sand jamming occurs to achieve automatic elimination of sand jamming, but also realize automatic prevention and elimination of sand jamming and sand burial according to the set equipment shutdown and startup logic, effectively and comprehensively solve the problem of sand jamming and sand burial of the screw pump, greatly promote the intelligent development of oil production equipment, and is suitable for popularization and application.

[0070] Embodiment 4

[0071] The embodiments of the present invention provide a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, they are used to implement the all-metal conical screw pump sand jamming automatic elimination method described in the above Embodiment 1 or Embodiment 2.

[0072] Note that the above are only the preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An automatic removal method for sand jamming of a fully metal conical screw pump, characterized in that, include: Set the normal mining torque range and torque alarm limit of the all-metal conical screw pump; Determining whether the real-time torque of the all-metal conical screw pump rotor is higher than the upper limit of the normal mining torque range; If the judgment result is yes, then judging whether the real-time torque of the all-metal conical screw pump rotor is higher than the torque alarm limit; If the real-time torque is lower than the torque alarm limit, the height of the dynamic liquid level is used to determine whether the liquid supply is sufficient. If it is sufficient, the liquid sand content is determined to be overloaded. The central control system controls the lifting system to execute the torque overload procedure to discharge sand until the torque returns to the normal mining torque range, and the sand jam is removed. If the real-time torque is higher than the torque alarm limit, the central control system will issue an alarm and directly determine that sand jam has occurred, and control the lifting system to execute the torque forced unloading procedure to discharge sand until the torque returns to the normal mining torque range, and the sand jam is removed; Also includes: If the real-time torque of the all-metal conical screw pump rotor is momentarily overloaded, the central control system automatically starts the shutdown procedure, the elevator goes up to the highest value, and at the same time starts the ultimate safety procedure to release the torque until the torque returns to zero; The central control system controls the lifting system to execute the torque forced unloading procedure to discharge sand until the torque is restored to the normal mining torque range, including: The central control system sends out a command to force the lifting system to rise. When the weighing system shows that the maximum value of the full oil pipe has been reached, the weight begins to drop, the stator and rotor of the all-metal conical screw pump disengage, and the drainage channel around the rotor will open, allowing the full oil pipe to drain until the torque is unloaded. When the torque returns to the normal mining torque range, the central control system instructs the lifting system to resume trial mining at the last normal mining position until it is confirmed that all data have reached the set indicators before formal mining.

2. The automatic sand jamming elimination method for the all-metal conical screw pump according to claim 1, characterized in that, When the torque returns to the normal mining torque range, the central control system instructs the lifting system to resume the position of the last normal mining for trial mining, and formal mining is not carried out until all data are confirmed to meet the set indicators, which also includes: If the torque continues to be overloaded after mining resumes, the central control system controls the lifting system to repeat the ascent several times according to a preset program, wherein the position of each repeated ascent is higher than the previous ascent by a set value until the torque returns to normal.

3. The automatic sand jamming removal method for the all-metal conical screw pump according to claim 2, characterized in that, The position of each repeated rise is higher than the previous rise by a set value, and the set value is a height value adjusted by an adjustment cycle; wherein, according to the line height of each circle of the thread stroke of the adjusting bolt of the adjusting rod and the thread stroke that can rotate the adjusting bolt when the lifting system is lifted once, the number of lifting and lowering times of the lifting system required for the adjusting bolt of the adjusting rod to be screwed one circle is calculated, and the adjustment process of each circle of the adjusting bolt of the adjusting rod is set as an adjustment cycle.

4. The automatic sand jamming elimination method for the all-metal conical screw pump according to claim 1, wherein The ultimate safety procedure described above releases the torque until the torque returns to zero, including: A torque safety system is set up and installed on the back of the control cabinet of the central control system. It is composed of n resistors. After the ultimate safety program is started, the resistor uses resistance to prevent the motor from reversing at high speed, and controls the reversal at a safe speed, so that when the torque is unloaded, it forms a reaction force with the high torque transmitted from the well, so that the sucker rod becomes tighter and tighter and will not fall off, until the torque returns to zero.

5. The automatic sand jamming elimination method for the all-metal conical screw pump according to claim 1 further includes: When the all-metal conical screw pump is about to stop, the central control system does not immediately control the oil production equipment to stop. Instead, it first instructs the lifting system to rise by a preset height to open the clearance channel between the stator and rotor of the all-metal conical screw pump. At the same time, the rotational speed is decreased to the set rotational speed within the set time according to the set descending logic, so that the torque is unloaded and the full pipe of liquid is unloaded until the torque returns to the set shutdown safety value. When the torque returns to the set shutdown safety value and the change range is within the set fluctuation range, the central control system determines safety and controls the oil production equipment to stop, realizing the prevention of sand jamming and sand burial during shutdown.

6. The automatic sand jamming removal method for the all-metal conical screw pump according to claim 1, characterized in that, The automatic sand jamming elimination method for the all-metal conical screw pump further includes: When the all-metal conical screw pump is about to start, the central control system does not directly control the oil production equipment to start. Instead, it first judges whether the drive motor can accelerate the rotational speed to the preset self-check rotational speed within the set time and judges whether the torque is within the set normal production torque range during this period. If the drive motor can accelerate the rotational speed to the preset self-check rotational speed within the set time and the torque is within the set normal production torque range during this period, the central control system determines that the start is safe and instructs the oil production equipment to start. If the torque exceeds the upper limit value of the set normal production torque range during the period when the drive motor accelerates the rotational speed to the preset self-check rotational speed within the set time, the central control system controls the lifting system to execute the torque overload procedure to remove sand until the torque returns to the normal production torque range until the central control system determines that the start is safe.

7. An automatic sand jamming removal system for an all-metal conical screw pump, characterized in that The system includes a lifting system, a position controller, and a central control system, and uses the automatic sand jamming elimination method for the all-metal conical screw pump described in claim 1 to complete the automatic elimination and prevention of sand jamming of the all-metal conical screw pump.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the automatic sand jamming elimination method for the all-metal conical screw pump described in claim 1.

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