Method, device and system for automatically adjusting working condition operation of same-well production and injection gas well

Abstract

The invention relates to a method, a device and a system for automatically adjusting working condition operation of a same-well production and injection gas well, and belongs to the technical field of oil and gas exploitation. Five core parameters, namely environment temperature, motor temperature rise, flow, pump suction inlet pressure and duration time, of an electric pump during operation of the gas well are comprehensively judged; the electric pump judges the temperature rise, the flow and the pressure of a pump suction inlet, finds out the temperature rise reason of the electric pump, judges whether the temperature rise is caused by small flow or stuck of the electric pump or is caused by temperature rise under normal working conditions, and adjusts the frequency of the electric pump according to different conditions, so that the working condition operation requirements of the electric pump are met, and the service life of the electric pump is prolonged. And the electric pump is automatically adjusted to solve the problem of frequent shutdown of the electric pump caused by too high temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploitation, and particularly to an automatic adjustment method, device and system for the operation condition of a gas injection and production well in the same well. Background Art

[0002] The gas-liquid mixture in the production layer of the gas injection and production well in the same well enters the casing space where the electric pump is located. The gas-liquid mixture enters the separator from the suction port of the separator, and the gas-liquid separation is achieved through centrifugal force. The separated liquid enters the suction port of the electric pump through the bridge channel of the separator, becomes high-pressure liquid after being pressurized by the electric pump, enters the tubing below the bridge-type shunt through-cable packer, passes through the check valve, and then passes through the flow path conversion mechanism of the bridge-type shunt through-cable packer, and finally enters the oil-casing annulus space above the packer and is injected into the injection layer.

[0003] The electric pump is a core device for gas production in gas wells. Usually, during the natural gas production process, the electric pump is usually controlled manually, by single-flow automatic control, semi-manual semi-automatic control, etc. However, there are also problems such as affecting natural gas production and malfunctions caused by manual misoperations.

[0004] In order to improve natural gas production and safety, full-automatic adjustment is currently adopted. The Chinese invention patent "A Method and Device for Intelligent Adjustment of Gas Well Production" (application publication number: CN104913198A) discloses a method and device for intelligent adjustment of gas well production. It is necessary to separately read the oil pressure and casing pressure values of the pressure gauge, combine the gas production volume, calculate the reasonable valve opening, and send an instruction to the control valve through the control box to make it reach the appropriate opening. The control rod of the downhole controller moves to the left direction until it is balanced because the force on the left side is less than the force on the right side, so that the throttle hole opening is between the maximum opening and the minimum opening, so as to make the gas flow rate reach the maximum and achieve the goal of carrying the most liquid. The above technology can achieve the purpose of automatically adjusting the gas well, but there is still a problem that the electric pump frequently stops due to too high temperature during the gas well production process, and the above technology cannot identify and handle the fault problem. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic adjustment method, device and system for the operation condition of a gas injection and production well in the same well, so as to solve the problem that the electric pump frequently stops due to too high temperature.

[0006] To solve the above technical problems, the present invention provides an automatic adjustment method for the operation condition of a gas injection and production well in the same well, which obtains the temperature rise value of the motor in the electric pump and the ambient temperature when the motor in the electric pump works normally underground, calculates the difference between the two and calls it the temperature rise ΔT, and judges ΔT:

[0007] If T1 < ΔT ≤ T2, and the electric pump flow rate Q satisfies Q < Q1 and lasts for a certain period of time, then the electric pump frequency is increased;

[0008] If T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 ≥ P and lasts for a certain period of time, then increase the frequency of the electric pump;

[0009] Wherein, T1 is the first temperature threshold, T2 is the second temperature threshold, and T1 < T2, Q1 is the first flow rate threshold, and P is the suction pressure threshold of the electric pump.

[0010] The beneficial effects of the above technical solution are as follows: By comprehensively judging the five core parameters of ambient temperature, motor temperature rise, flow rate, pump suction pressure, and duration, when the temperature rise of the electric pump is large, manifested as T1 < ΔT ≤ T2, and the flow rate of the electric pump is less than the first flow rate threshold, it is determined that the electric pump cannot discharge the internal heat in time due to the small flow rate, resulting in a large temperature rise of the electric pump, and the frequency of the electric pump is increased to meet the operation requirements; when the temperature rise of the electric pump is too large, manifested as T2 < ΔT, the flow rate of the electric pump is less than or equal to the first flow rate threshold, and the suction pressure of the electric pump is greater than the suction pressure threshold of the electric pump, it is determined that there is no pump jamming phenomenon inside the electric pump, and only because the flow rate is small and the internal heat cannot be discharged in time, resulting in a large temperature rise of the electric pump, and the frequency of the electric pump is increased to meet the operation requirements.

[0011] Furthermore, if ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q ≥ Q2 and lasts for a certain period of time, then decrease the frequency of the electric pump, where Q2 is the second flow rate threshold.

[0012] The beneficial effects of the above technical solution are as follows: When the temperature rise amplitude of the electric pump is small, manifested as ΔT ≤ T1, the flow rate of the electric pump is greater than the second flow rate threshold, and the flow rate of the electric pump is too large, and the electric pump does not require too large a flow rate during operation, the frequency of the electric pump is decreased to meet the operation requirements.

[0013] Furthermore, if ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q < Q2 and lasts for a certain period of time, the electric pump continues to operate at the current working frequency.

[0014] The beneficial effects of the above technical solution are as follows: When the temperature rise amplitude of the electric pump is small, manifested as ΔT ≤ T1, the flow rate of the electric pump is less than the second flow rate threshold, and the flow rate of the electric pump is normal, and the electric pump operates normally, and the frequency remains unchanged.

[0015] Furthermore, if T1 < ΔT ≤ T2, and the flow rate Q of the electric pump satisfies Q ≥ Q1 and lasts for a certain period of time, the electric pump continues to operate at the current working frequency.

[0016] The beneficial effects of the above technical solution are as follows: When the temperature rise of the electric pump is large, manifested as T1 < ΔT ≤ T2, and the flow rate of the electric pump is greater than or equal to the first flow rate threshold, the electric pump operates normally, and the frequency remains unchanged.

[0017] Further, if T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 < suction pressure P and lasts for a certain period of time, the electric pump will stop.

[0018] The beneficial effects of the above technical solution are as follows: When the temperature rise of the electric pump is too large, manifested as T2 < ΔT, the flow rate of the electric pump is less than or equal to the first flow rate threshold, and the suction pressure at the inlet of the electric pump is less than the suction pressure threshold of the electric pump, the temperature rise amplitude of the electric pump is large while the suction pressure and flow rate of the electric pump are both small. It is determined that the possible reason is that there is a pump jamming situation inside the electric pump, and the electric pump is shut down.

[0019] Further, the first temperature threshold and the second temperature threshold are obtained through the failure analysis and statistics of several gas injection and production wells in the same well.

[0020] The beneficial effects of the above technical solution are as follows: Through the failure analysis and statistics of several gas injection and production wells in the same well, the temperature threshold is set to make the adjustment of the electric pump more accurate and more in line with the actual situation.

[0021] To solve the above technical problems, the present invention also provides an automatic adjustment device for the operating conditions of a gas injection and production well in the same well. The device includes a memory and a processor, as well as a computer program stored on the memory and running on the processor. The processor is used to execute the computer program instructions stored in the memory to implement the automatic adjustment method for the operating conditions of a gas injection and production well in the same well.

[0022] The beneficial effects of the above technical solution are as follows: The automatic adjustment device for the operating conditions of a gas injection and production well in the same well comprehensively judges five core parameters, namely environmental temperature, motor temperature rise, flow rate, pump suction pressure, and duration, to solve the problem of frequent shutdown of the electric pump caused by excessive temperature.

[0023] To solve the above technical problems, the present invention also provides an automatic adjustment system for the operating conditions of a gas injection and production well in the same well, including an electric pump, and further including a data acquisition module and a control module; the data acquisition module is used to collect the operating data of the electric pump, and the operating data includes the temperature rise value of the motor inside the electric pump, the environmental temperature when the motor inside the electric pump works normally underground, the flow rate Q of the electric pump, and the suction pressure P of the electric pump 吸 , and is connected to the control module to transmit the collected information to the control module; the control module is used to receive the information of the data acquisition module and control the operation of the electric pump. The control module includes a processor and a memory, and the processor is used to implement the automatic adjustment method for the operating conditions of a gas injection and production well in the same well.

[0024] The beneficial effects of the above technical solution are as follows: The automatic adjustment system for the operating conditions of gas injection and production wells in the same well comprehensively judges five core parameters of the electric pump during the operation of the gas well, namely, the ambient temperature, the motor temperature rise, the flow rate, the suction pressure at the pump inlet, and the duration, so as to solve the problem that the electric pump frequently stops due to excessive temperature. Description of the Drawings

[0025] Figure 1 It is the automatic adjustment flowchart of the operating conditions for the automatic adjustment method of the gas injection and production wells in the same well of the present invention. Detailed Embodiments

[0026] Set the difference between the motor temperature rise value in the electric pump and the ambient temperature when the motor in the electric pump works normally underground as the temperature rise ΔT. Under different temperature conditions, by judging the magnitude and duration of the flow rate or suction pressure at the pump inlet of the electric pump, the frequency of the electric pump is adjusted to solve the problem that the electric pump frequently stops due to excessive temperature.

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0028] Embodiment of the automatic adjustment method for the operating conditions of gas injection and production wells in the same well:

[0029] An automatic adjustment method for the operating conditions of gas injection and production wells in the same well is as Figure 1 shown, and specifically includes:

[0030] Obtain the motor temperature rise value in the electric pump and the ambient temperature when the motor in the electric pump works normally underground, calculate the difference between the two and call it the temperature rise ΔT, and judge ΔT:

[0031] If T1 < ΔT ≤ T2, and the flow rate Q of the electric pump satisfies Q < Q1 and lasts for a certain period of time, then increase the frequency of the electric pump;

[0032] If T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 ≥ P and lasts for a certain period of time, then increase the frequency of the electric pump;

[0033] Among them, T1 is the first temperature threshold, T2 is the second temperature threshold, and T1 < T2, Q1 is the first flow rate threshold, and P is the suction pressure threshold of the electric pump inlet.

[0034] If ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q ≥ Q2 and lasts for a certain period of time, then decrease the frequency of the electric pump, where Q2 is the second temperature threshold.

[0035] If ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q < Q2 and lasts for a certain period of time, make the electric pump continue to work at the current working frequency.

[0036] If T1 < ΔT ≤ T2, and the flow rate Q of the electric pump satisfies Q ≥ Q1 and lasts for a certain period of time, the electric pump continues to operate at the current working frequency.

[0037] If T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 < the suction force P and lasts for a certain period of time, the electric pump stops operating.

[0038] Among them, the increase value of the motor temperature in the electric pump is the increase value of the motor temperature within five minutes of the operation of the electric pump. The first temperature threshold and the second temperature threshold are obtained through the failure analysis and statistics of several gas injection and production wells in the same well. The first temperature T1 is specifically set at 20 °C, and the second temperature T2 is specifically set at 30 °C; the first flow rate Q1 is specifically set at 50 m 3 / d, and the second flow rate Q2 is specifically set at 30 m 3 / d; the suction force P is specifically set at 3 Mpa; the above data can be adjusted according to the actual situation.

[0039] The specific embodiment of the automatic adjustment method for the operation conditions of the gas injection and production wells in the same well is as follows:

[0040] Taking the J72P18 well as an example, the abnormal operation conditions of this well are adjusted by using the automatic adjustment method for the operation conditions of the gas injection and production wells in the same well. The specific steps are as follows:

[0041] (1) Set the ambient temperature T when the motor operates normally underground 环 = 90 °C;

[0042] (2) When the well is in normal production at the initial stage, the motor temperature T 电机 is about 103 °C, and the flow rate Q is about 28 m 3 / d. At this stage, ΔT ≤ 20 °C, Q < 50 m 3 / d, and the operation conditions of the electric pump are normal, and the frequency remains unchanged.

[0043] (3) After 4 months of production, the motor temperature T 电机 rises to about 115, and the flow rate Q is about 16 m 3 / d, and the frequency is 33 Hz. At this stage, when 20 °C < ΔT ≤ 30 °C, Q < 30 m 3 / d, and when the duration is 5 min, the frequency is increased by 1 Hz. After the increase, the frequency is 34 Hz, and the flow rate Q is about 35 m 3 / d. When the duration is 5 min, the operation conditions of the electric pump are normal, and the frequency remains unchanged.

[0044] Through the automatic adjustment of the operation conditions of the gas injection and production wells in the same well, the influence of abnormal operation conditions of the gas well on production is effectively avoided.

[0045] Embodiment of the Automatic Adjustment Device for the Operating Conditions of Gas Injection and Production Wells in the Same Well:

[0046] An automatic adjustment device for the operating conditions of gas injection and production wells in the same well, the device includes a memory and a processor, as well as a computer program stored on the memory and running on the processor, and the processor is used to execute the computer program instructions stored in the memory to implement the automatic adjustment method for the operating conditions of gas injection and production wells in the same well.

[0047] The specific settings of the automatic adjustment device for the operating conditions of gas injection and production wells in the same well have been introduced in detail in the embodiment of the automatic adjustment method for the operating conditions of gas injection and production wells in the same well, and will not be elaborated in this embodiment.

[0048] Embodiment of the Automatic Adjustment System for the Operating Conditions of Gas Injection and Production Wells in the Same Well:

[0049] An automatic adjustment system for the operating conditions of gas injection and production wells in the same well, including an electric pump, and also including a data acquisition module and a control module; the data acquisition module is used to acquire the operating data of the electric pump, and the operating data includes the temperature rise value of the motor in the electric pump, the ambient temperature when the motor in the electric pump works normally underground, the flow rate Q of the electric pump, and the suction pressure P of the electric pump 吸 , and is connected to the control module to transmit the acquired information to the control module; the control module is used to receive the information of the data acquisition module and control the operation of the electric pump, and the control module includes a processor and a memory, and the processor is used to implement the automatic adjustment method for the operating conditions of gas injection and production wells in the same well.

[0050] The specific settings of the automatic adjustment system for the operating conditions of gas injection and production wells in the same well have been introduced in detail in the embodiment of the automatic adjustment method for the operating conditions of gas injection and production wells in the same well, and will not be elaborated in this embodiment.

[0051] The specific implementation manners are given above, but the present invention is not limited to the described implementation manners. The basic idea of the present invention lies in the above basic solution. For those of ordinary skill in the art, according to the teachings of the present invention, it does not require creative labor to design various deformed models, formulas, and parameters. Changes, modifications, substitutions, and variations made to the implementation manners without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. An automatic adjustment method for the operating conditions of gas injection and production wells in the same well, characterized in that, obtain the temperature rise value of the motor in the electric pump and the ambient temperature when the motor in the electric pump operates normally underground, calculate the difference between the two and call it the temperature rise ΔT, and judge ΔT: If T1 < ΔT ≤ T2, and the flow rate Q of the electric pump satisfies Q < Q1 and lasts for a certain period of time, then increase the frequency of the electric pump; If T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 ≥ P and lasts for a certain period of time, then increase the frequency of the electric pump; wherein, T1 is the first temperature threshold, T2 is the second temperature threshold, and T1 < T2, Q1 is the first flow rate threshold, and P is the suction pressure threshold of the electric pump.

2. The automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to claim 1, characterized in that, If ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q ≥ Q2 and lasts for a certain period of time, then decrease the frequency of the electric pump, where Q2 is the second temperature threshold.

3. The automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to claim 1, characterized in that, If ΔT ≤ T1, and the flow rate Q of the electric pump satisfies Q < Q2 and lasts for a certain period of time, make the electric pump continue to operate at the current working frequency.

4. The automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to claim 1, characterized in that, If T1 < ΔT ≤ T2, and the flow rate Q of the electric pump satisfies Q ≥ Q1 and lasts for a certain period of time, make the electric pump continue to operate at the current working frequency.

5. The automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to claim 1, characterized in that, If T2 < ΔT, and the flow rate Q of the electric pump satisfies Q ≤ Q1 and the suction pressure P of the electric pump 吸 satisfies P 吸 < the suction force P and lasts for a certain period of time, the electric pump will stop 6. The automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to claim 1, characterized in that, The first temperature threshold and the second temperature threshold are obtained through fault analysis and statistics of several gas injection and production wells in the same well.

7. An automatic adjustment device for the operating conditions of gas injection and production wells in the same well, characterized in that, The device includes a memory and a processor, as well as a computer program stored on the memory and running on the processor. The processor is used to execute the computer program instructions stored in the memory to implement the automatic adjustment method for the operating conditions of gas injection and production wells in the same well according to any one of claims 1 to 6.

8. An automatic adjustment system for the operating conditions of gas injection and production wells in the same well, including an electric pump, characterized in that, It further includes a data acquisition module and a control module; the data acquisition module is used to acquire the operation data of the electric pump, and the operation data includes the temperature increase value of the motor in the electric pump, the ambient temperature when the motor in the electric pump works normally underground, the flow rate Q of the electric pump, and the suction pressure P of the electric pump 吸 , and is connected to the control module to transmit the acquired information to the control module; the control module is used to receive the information of the data acquisition module and control the operation of the electric pump. The control module includes a processor and a memory, and the processor is used to implement the automatic adjustment method for the operation conditions of the gas injection and production well in the same well as claimed in any one of claims 1 to 6.

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