Well testing pretreatment method and device

Abstract

The invention discloses a well testing pretreatment method and device and belongs to the field of oilfield development. The method is applied to computer equipment and comprises the steps that a liquid injection device is controlled to inject liquid into a first well, and the liquid injected into the first well permeates into a target reservoir through the well wall of the first well; monitoring the pressure of the wellhead of the first well in the process of injecting the liquid into the first well; when it is monitored that the pressure of the wellhead of the first well reaches a pressure threshold value, the liquid injection device is controlled to stop injecting liquid into the first well, and the change rate of the pressure of the wellhead of the first well is monitored; when it is monitored that the change rate of the pressure of the wellhead of the first well is stable, a liquid return channel and a first packer are controlled to be opened, and liquid permeating into the target reservoir flows back to the wellhead of the first well through the liquid return channel; and in the liquid backflow process, the pressure difference between the two sides of the first packer is monitored, and when it is monitored that the pressure difference between the two sides of the first packer reaches a pressure difference threshold value, the liquid return channel is controlled to be closed. The well testing effect can be improved.

Description

Technical Field

[0001] This application relates to the field of oilfield development, and particularly to a well testing pretreatment method and device. Background Art

[0002] Well testing is required to determine the production capacity of a well and reservoir parameters. However, in actual well testing, for reservoirs with low permeability and poor conductivity, the current well testing technology is greatly affected by the wellbore storage effect, with a long testing time and poor well testing results. Summary of the Invention

[0003] This application provides a well testing pretreatment method and device. The technical solution provided by this application can create conditions for well testing and help improve the well testing effect. The technical solution of this application is as follows.

[0004] In a first aspect, a well testing pretreatment method is provided, which is applied to a computer device. The method includes:

[0005] Controlling a liquid injection device to inject liquid into a first well, so that the liquid injected into the first well penetrates through the well wall of the first well into a target reservoir. Among them, a logging device is lowered into the first well, and the logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer;

[0006] During the process of injecting the liquid into the first well, monitoring the pressure at the wellhead of the first well;

[0007] When it is monitored that the pressure at the wellhead of the first well reaches a pressure threshold, controlling the liquid injection device to stop injecting the liquid into the first well and monitoring the change rate of the pressure at the wellhead of the first well;

[0008] When it is monitored that the change rate of the pressure at the wellhead of the first well is stable, controlling the liquid return channel and the first packer to open, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel;

[0009] During the process of the liquid flowing back, monitoring the pressure difference between both sides of the first packer. When it is monitored that the pressure difference between both sides of the first packer reaches a pressure difference threshold, controlling the liquid return channel to close.

[0010] Optionally, the logging device further includes a valve, and the valve is used to control the opening or closing of the liquid return channel; controlling the liquid return channel to open includes: controlling the valve to open.

[0011] Optionally, the logging device further includes a first opening and a second opening. The first opening, the first packer, and the second opening are sequentially distributed along the height direction of the logging device, and the valve is located between the first opening and the second opening.

[0012] The liquid return channel includes the first opening, the second opening, and the inner cavity of the logging device.

[0013] Optionally, the logging device further includes a second packer. The second packer, the first opening, and the first packer are sequentially distributed along the height direction of the logging device. The first packer and the second packer are located on both sides of the target reservoir. The method further includes: when the change rate of the pressure at the wellhead of the first well is monitored to be stable, controlling the second packer to open.

[0014] Optionally, the logging device further includes a first pressure sensor and a second pressure sensor, which are located on both sides of the first packer.

[0015] Monitoring the pressure difference across the first packer includes: monitoring the pressure difference across the first packer through the first pressure sensor and the second pressure sensor.

[0016] In a second aspect, a well test preprocessing device is provided, which is applied to a computer device. The well test preprocessing device includes a control module and a detection module.

[0017] The control module is configured to control a liquid injection device to inject liquid into a first well, so that the liquid injected into the first well penetrates through the wellbore wall of the first well into a target reservoir. A logging device is lowered into the first well, and the logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer.

[0018] The monitoring module is configured to monitor the pressure at the wellhead of the first well during the process of injecting the liquid into the first well.

[0019] The control module is further configured to control the liquid injection device to stop injecting the liquid into the first well when it is monitored that the pressure at the wellhead of the first well reaches a pressure threshold.

[0020] The monitoring module is further configured to monitor the change rate of the pressure at the wellhead of the first well after controlling the liquid injection device to stop injecting the liquid into the first well.

[0021] The control module is further configured to control the liquid return channel and the first packer to open when the change rate of the pressure at the wellhead of the first well is monitored to be stable, so that the liquid permeating into the target reservoir flows back to the wellhead of the first well through the liquid return channel;

[0022] The monitoring module is further configured to monitor the pressure difference across the first packer during the liquid reflux process;

[0023] The control module is further configured to control the liquid return channel to close when the pressure difference across the first packer is monitored to reach the pressure difference threshold.

[0024] Optionally, the well logging device further includes a valve for controlling the opening or closing of the liquid return channel; the control module is specifically configured to control the valve to open when the change rate of the pressure at the wellhead of the first well is monitored to be stable, so as to control the liquid return channel to open.

[0025] Optionally, the well logging device further includes a first opening and a second opening, the first opening, the first packer, and the second opening are sequentially distributed along the height direction of the well logging device, and the valve is located between the first opening and the second opening; the liquid return channel includes the first opening, the second opening, and the inner cavity of the well logging device.

[0026] Optionally, the well logging device further includes a second packer, the second packer, the first opening, and the first packer are sequentially distributed along the height direction of the well logging device, the first packer and the second packer are located on both sides of the target reservoir, and the control module is further configured to control the second packer to open when the change rate of the pressure at the wellhead of the first well is monitored to be stable.

[0027] Optionally, the well logging device further includes a first pressure sensor and a second pressure sensor, and the first pressure sensor and the second pressure sensor are located on both sides of the first packer;

[0028] The monitoring module is specifically configured to monitor the pressure difference across the first packer through the first pressure sensor and the second pressure sensor.

[0029] In a third aspect, a well test preprocessing device is provided, including a memory and a processor;

[0030] The memory is used for storing a computer program;

[0031] The processor is configured to execute the computer program stored in the memory so that the well test preprocessing device executes the well test preprocessing method provided in the first aspect or any optional implementation manner of the first aspect.

[0032] In a fourth aspect, a logging device is provided. The logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer.

[0033] Optionally, the logging device further includes a valve for controlling the opening or closing of the liquid return channel.

[0034] Optionally, the logging device further includes a first opening and a second opening. The first opening, the first packer, and the second opening are sequentially distributed along the height direction of the logging device, and the valve is located between the first opening and the second opening;

[0035] The liquid return channel includes the first opening, the second opening, and the inner cavity of the logging device.

[0036] Optionally, the logging device further includes a second packer. The second packer, the first opening, and the first packer are sequentially distributed along the height direction of the logging device.

[0037] Optionally, the logging device further includes a first pressure sensor and a second pressure sensor; the first pressure sensor and the second pressure sensor are located on both sides of the first packer, and the first pressure sensor and the second pressure sensor are used to collect the pressures on both sides of the first packer.

[0038] In a fifth aspect, a computer device is provided. The computer device may be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc. The computer device includes a well testing preprocessing device provided in the second aspect or any optional implementation manner of the second aspect, or the computer device includes a well testing preprocessing device provided in the third aspect.

[0039] In a sixth aspect, a computer-readable storage medium is provided. A computer program is stored in the computer-readable storage medium, and when the computer program is executed, the well testing preprocessing method provided in the first aspect or any optional manner of the first aspect is implemented.

[0040] In a seventh aspect, a computer program product is provided. The computer program product includes a program or code, and when the program or code is executed, the well testing preprocessing method provided in the first aspect or any optional manner of the first aspect is implemented.

[0041] The beneficial effects brought by the technical solutions provided in this application include:

[0042] After the logging device including a liquid return channel and a first packer is lowered into the first well according to the technical solution provided by the present application, the computer device controls the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the wellbore wall of the first well into the target reservoir. During the process of injecting liquid into the first well by the liquid injection device, the computer device monitors the pressure at the wellhead of the first well. When it is monitored that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device controls the liquid injection device to stop injecting liquid into the first well and monitors the rate of change of the pressure at the wellhead of the first well. When it is monitored that the rate of change of the pressure at the wellhead of the first well is stable, the computer device controls the liquid return channel and the first packer to open, so that the liquid penetrating into the target reservoir flows back to the wellhead of the first well through the liquid return channel. During the process of liquid reflux, the computer device monitors the pressure difference between both sides of the first packer. When it is monitored that the pressure difference between both sides of the first packer reaches the pressure difference threshold, the computer device controls the liquid return channel to close. By preprocessing the first well in such a preprocessing method, conditions can be created for well testing. For example, a sufficiently large pressure difference can be ensured to be formed inside and outside the target reservoir in the first well. After preprocessing the first well according to the technical solution provided by the present application, the difficulty of well testing can be reduced and the well testing effect can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 is a schematic diagram of a state of the logging device provided by an embodiment of the present application;

[0045] Figure 2 is another schematic diagram of a state of the logging device provided by an embodiment of the present application;

[0046] Figure 3 is a flowchart of a well testing preprocessing method provided by an embodiment of the present application;

[0047] Figure 4 is a schematic diagram of a well testing preprocessing scenario provided by an embodiment of the present application;

[0048] Figure 5 is another schematic diagram of a well testing preprocessing scenario provided by an embodiment of the present application;

[0049] Figure 6 is a schematic diagram of a well testing preprocessing device provided by an embodiment of the present application;

[0050] Figure 7It is a schematic diagram of another well testing pretreatment device provided by an embodiment of the present application.

[0051] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Detailed implementation manners

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application 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 application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0053] With the progress of exploration technology and petroleum engineering technology, unconventional oil and gas reservoirs have become one of the important oil and gas fields in China, such as tight oil reservoirs, shale oil and gas reservoirs, etc. The physical property parameters of the sweet spot reservoirs (i.e., reservoirs rich in oil and gas and having economic exploitation value) in unconventional oil and gas reservoirs are characterized by low porosity, low permeability, poor flow conductivity, etc., and cannot produce stably. It is necessary to artificially generate sufficient pressure difference to promote production. Therefore, it is necessary to carry out reservoir stimulation on unconventional oil and gas reservoirs to increase the flow conductivity of the reservoir and achieve efficient production and development.

[0054] As a reservoir stimulation technology, the controllable shock wave technology can be used to create a fracture network in a tight oil reservoir or a shale oil and gas reservoir, increase its flow conductivity, and expand the heat and mass transfer volume. After the reservoir stimulation, it is necessary to evaluate the effect of the reservoir stimulation. Well testing is an important technology for testing and evaluating the physical property characteristic parameters of a reservoir. However, for reservoirs with low permeability and poor flow conductivity, the current well testing methods are greatly affected by the wellbore storage effect, the testing time is long, and it is extremely difficult to have a radial flow section, resulting in poor well testing effects. Downhole shut-in can reduce the influence of the wellbore storage effect on well testing. The current downhole shut-in methods generally perform downhole shut-in through pressure or a clock, and it is difficult to ensure stable production downhole, downhole shut-in, and form a sufficiently large pressure difference inside and outside the reservoir at the same time.

[0055] Embodiments of the present application provide a well test pretreatment method and device. The well test pretreatment method is applied to a computer device. For example, the well test pretreatment method is executed by the computer device or a well test pretreatment device deployed in the computer device. By way of example, after a logging device including a liquid return channel and a first packer is lowered into a first well, the computer device controls a liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the well wall of the first well into a target reservoir. During the process of the liquid injection device injecting liquid into the first well, the computer device monitors the pressure at the wellhead of the first well. When it is monitored that the pressure at the wellhead of the first well reaches a pressure threshold, the computer device controls the liquid injection device to stop injecting liquid into the first well and monitors the change rate of the pressure at the wellhead of the first well. When it is monitored that the change rate of the pressure at the wellhead of the first well is stable, the computer device controls the liquid return channel and the first packer to open, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel. During the process of liquid reflux, the computer device monitors the pressure difference between both sides of the first packer. When it is monitored that the pressure difference between both sides of the first packer reaches a pressure difference threshold, the computer device controls the liquid return channel to close. By performing pretreatment on the first well in such a pretreatment manner, conditions for well testing can be created. For example, a sufficiently large pressure difference can be ensured to be formed inside and outside the target reservoir in the first well. After the first well is pretreated by the technical solution provided by the embodiments of the present application, the difficulty of well testing can be reduced and the well testing effect can be improved.

[0056] The technical solution of the present application will be introduced below. First, the logging device provided by the embodiments of the present application will be introduced.

[0057] Please refer to Figure 1 , which shows a schematic diagram of a logging device 100 provided by an embodiment of the present application. As Figure 1 shown, the logging device 100 includes a liquid return channel 101 and a first packer 102, and the liquid return channel 101 passes through the first packer 102. The liquid return channel 101 is used for liquid reflux. For example, the liquid return channel 101 is used for liquid to reflux along the height direction y of the logging device 100. The first packer 102 is used to seal a first space from the first packer 102 to the wellhead of the first well. By way of example, after the first packer 102 is opened, it clings to the well wall of the first well to seal the first space. Figure 1 is a schematic diagram of the logging device 100 when the first packer 102 is in a closed state. Figure 2 is a schematic diagram of the logging device 100 when the first packer 102 is in an open state.

[0058] As Figure 1As shown, the logging device 100 has a hollow structure, and the logging device 100 includes an inner cavity Q. The logging device 100 further includes a first opening 1011 and a second opening 1012. The first opening 1011, the first packer 102, and the second opening 1012 are sequentially distributed along the height direction y of the logging device 110. The liquid return channel 101 includes the first opening 1011, the second opening 1012, and the inner cavity Q of the logging device 100. By way of example, the first opening 1011, the second opening 1012, and the inner cavity Q of the logging device 100 constitute the liquid return channel 101. The first opening 1011 is the liquid inlet of the liquid return channel 101, and the second opening 1012 is the liquid outlet of the liquid return channel 101. The liquid return channel 101 is used for the liquid to pass through the first opening 1011, the inner cavity Q of the logging device 100, and the second opening 1012 in sequence, and the liquid flows back along the height direction y of the logging device 100.

[0059] As Figure 1 shown, the logging device 100 further includes a valve 103. The valve 103 is used to control the opening or closing of the liquid return channel 101. When the valve 103 is open, the liquid return channel 101 is open; when the valve 103 is closed, the liquid return channel 101 is closed. By way of example, Figure 1 FIG. is a schematic diagram of the logging device 100 when the valve 103 is in the closed state, Figure 2 FIG. is a schematic diagram of the logging device 100 when the valve 103 is in the open state. Optionally, the valve 103 is located between the first opening 1011 and the second opening 1012. When the valve 103 is open, the liquid return channel 101 is used for the liquid to flow back through the first opening 1011, the inner cavity Q of the logging device 100, and the second opening 1012 in sequence.

[0060] As Figure 1 shown, the logging device 100 further includes a second packer 104. The second packer 104, the first opening 1011, and the first packer 102 are sequentially distributed along the height direction y of the logging device 100. The second packer 104 is used to seal off the third space from the second packer 104 to the bottom of the first well, and, together with the first packer 102, seal off the second space between the first packer 102 and the second packer 104. By way of example, after the first packer 102 and the second packer 104 are opened, they are closely attached to the well wall of the first well to seal off the second space and the third space. Figure 1 FIG. is a schematic diagram of the logging device 100 when the second packer 104 is in the closed state, Figure 2 FIG. is a schematic diagram of the logging device 100 when the second packer 104 is in the open state.

[0061] As Figure 1As shown, the logging device 100 further includes: a first pressure sensor 105 and a second pressure sensor 106. The first pressure sensor 105 and the second pressure sensor 106 are located on both sides of the first packer 102, and the first pressure sensor 105 and the second pressure sensor 106 are used to collect the pressures on both sides of the first packer 102. Figure 1 Taking the first pressure sensor 105 being located above the first packer 102 and the second pressure sensor 106 being located below the first packer 102 as an example, the first pressure sensor 105 is used to collect the pressure above the first packer 102, and the second pressure sensor 106 is used to collect the pressure below the first packer 102. The pressures on both sides of the first packer 102 can be determined based on the pressure collected by the first pressure sensor 105 and the pressure collected by the second pressure sensor 106.

[0062] In an alternative embodiment, both the first packer 102 and the second packer 104 are electrically controlled packers, and the valve 103 is an electrically controlled valve. That is, the opening or closing of any of the first packer 102, the second packer 104, and the valve 103 can be controlled by an electrical signal, which can improve the convenience of control.

[0063] As Figure 1 As shown, the logging device 100 further includes a third opening 107 and a fourth opening 108. The third opening 107, the second packer 104, the first opening 1011, the first packer 102, the second opening 1012, and the fourth opening 108 are sequentially distributed along the height direction y of the logging device 110. When the first packer 102 and the second packer 104 are closed and the valve 103 is open, the third opening 107 and the fourth opening 108 can communicate the space above the first packer 102 and the space below the second packer 104.

[0064] In an alternative embodiment, the logging device 100 further includes a hydraulic drive module, a flow control module, and a pumping and draining module (not shown in the figure). The hydraulic drive module generates high-pressure liquid by pressurizing the liquid inside the hydraulic drive module to drive other modules in the logging device 100 to operate. For example, the hydraulic drive module is arranged near the first packer, and the first packer 102 can be opened by the high-pressure liquid generated by the hydraulic drive module. The flow control module and the pumping and draining module are used to pump the liquid in the inner cavity Q of the logging device 100.

[0065] Please refer to Figure 3, which shows a flowchart of a well test preprocessing method provided by an embodiment of the present application. The well test preprocessing method is applied to a computer device. For example, the well test preprocessing method is executed by the computer device or a well test preprocessing device deployed in the computer device. Hereinafter, an example will be given where the well test preprocessing method is executed by the computer device. The well test preprocessing method includes the following steps S301 to S305.

[0066] S301. Control the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the well wall of the first well into the target reservoir. Among them, a logging device is lowered into the first well, and the logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer.

[0067] In an embodiment of the present application, a logging device can be pre-lowered into the first well. The logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer. For example, for the structure of the logging device, please refer to Figure 1 and Figure 2 , and a schematic diagram after the logging device is lowered into the first well is as shown in Figure 4 . The computer device 200 is connected to the logging device 100 through a cable 109. Thus, the computer device 200 is connected to the first packer 102, the valve 103, the second packer 104, the first pressure sensor 105, and the second pressure sensor 106 through the cable 109. The computer device 200 controls the opening and closing of the first packer 102, the valve 103, and the second packer 104 through the cable 109, and obtains the pressure above the first packer 102 collected by the first pressure sensor 105 and the pressure below the first packer 102 collected by the second pressure sensor 106 through the cable 109. For example, the computer device 200 is connected to the liquid injection device, and the computer device 200 sends a first liquid injection signal to the liquid injection device to control the liquid injection device to inject liquid into the first well.

[0068] Among them, the first well penetrates the target reservoir. In an alternative embodiment, before lowering the logging device into the first well, a perforating instrument is used to perforate the well wall of the target section of the first well to improve the permeability of the well wall of the target section, and the target section is the well section where the target reservoir is located. After the logging device is lowered into the first well, the wellhead of the first well is sealed to create a sealed environment in the first well. In an alternative embodiment, the wellhead of the first well is sealed by adding a well cap and a sealing ring to the wellhead of the first well. During the process of injecting liquid into the first well, the liquid return channel in the logging device is controlled to be in a closed state to prevent the liquid in the first well from flowing back through the liquid return channel.

[0069] In an alternative embodiment, the liquid injection device is located on the ground outside the first well and is connected to the first well through a pipeline. The liquid injection device is connected to the computer device, and the computer device sends a first liquid injection signal to the liquid injection device. The first liquid injection signal is used to instruct the liquid injection device to start injecting liquid into the first well. The liquid injection device receives the first liquid injection signal and starts injecting liquid into the first well according to the first liquid injection signal. For example, the first liquid injection signal is a start signal (or an opening signal) of the liquid injection device, and the liquid injection device starts running according to the first liquid injection signal to start injecting liquid into the first well. In an alternative embodiment, the liquid injection device is connected to the well logging device through a cable. The liquid injection device integrates a wellhead blowout prevention device, a injection and discharge control device, and a metering device inside. The well test pretreatment device controls the injection and discharge control device to inject liquid into the first well, and the metering device can determine the amount of liquid injected into the first well.

[0070] In an alternative embodiment, the liquid is water. The liquid can also be other liquids.

[0071] S302. During the process of injecting the liquid into the first well, monitor the pressure at the wellhead of the first well.

[0072] Among them, the pressure at the wellhead of the first well refers to the pressure at the wellhead of the first well after the wellhead is sealed.

[0073] During the process of the liquid injection device injecting liquid into the first well, the pressure in the first well is constantly changing, and the pressure at the wellhead of the first well is constantly changing. For example, as the amount of liquid injected increases, the pressure in the first well continuously increases, and the pressure at the wellhead of the first well continuously increases. Therefore, during the process of the liquid injection device injecting liquid into the first well, the computer device monitors the pressure at the wellhead of the first well.

[0074] In an alternative embodiment, a pressure detection device is provided at the wellhead of the first well. The pressure detection device is located in the well and is used to collect the pressure at the wellhead of the first well. The computer device monitors the pressure at the wellhead of the first well through the pressure detection device. For example, the pressure detection device is a pressure sensor.

[0075] S303. When it is monitored that the pressure at the wellhead of the first well reaches the pressure threshold, control the liquid injection device to stop injecting the liquid into the first well and monitor the rate of change of the pressure at the wellhead of the first well.

[0076] During the process of the computer device monitoring the pressure at the wellhead of the first well, the computer device continuously judges (or monitors) whether the pressure at the wellhead of the first well reaches the pressure threshold. When the computer device monitors that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device controls the liquid injection device to stop injecting the liquid into the first well, and the computer device starts to monitor the rate of change of the pressure at the wellhead of the first well. Among them, the pressure at the wellhead of the first well reaching the pressure threshold means that the pressure at the wellhead of the first well is greater than or equal to the pressure threshold. The pressure threshold is less than or equal to the formation fracture pressure, and the formation fracture pressure is the maximum pressure that the formation can withstand. When the pressure on the formation exceeds the formation fracture pressure, the formation will fracture.

[0077] In an alternative embodiment, when the computer device monitors that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device sends a second liquid injection signal to the liquid injection device, and the second liquid injection signal is used to instruct the liquid injection device to stop injecting the liquid into the first well. The liquid injection device receives the second liquid injection signal, and the liquid injection device stops injecting the liquid into the first well according to the second liquid injection signal. For example, the second liquid injection signal is the shutdown signal of the liquid injection device, and the liquid injection device stops operating according to the second liquid injection signal to stop injecting the liquid into the first well.

[0078] Among them, the rate of change of pressure is the change amount of pressure per unit time. When the computer device monitors that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device starts to monitor the rate of change of the pressure at the wellhead of the first well. For example, the computer device monitors the pressure at the wellhead of the first well, and the computer device determines the rate of change of the pressure at the wellhead of the first well according to the pressure at the wellhead of the first well at different times. For example, the computer device determines the change amount of the pressure at the wellhead of the first well within the time period defined by any two times according to the pressure at the wellhead of the first well at any two times, and the computer device determines the rate of change of the pressure at the wellhead of the first well within the time period according to the change amount of the pressure at the wellhead of the first well within the time period. For example, when the computer device monitors that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device obtains the first pressure at the wellhead of the first well at the first time and the second pressure at the wellhead of the first well at the second time through the pressure detection device deployed at the wellhead of the first well. Taking the time period defined by the first time and the second time as the first time period, and the duration of the first time period as the first duration as an example. One of the first time and the second time is the start time of the first time period, and the other time is the end time of the first time period. The computer device determines the difference between the first pressure and the second pressure as the change amount of the pressure at the wellhead of the first well within the first time period, and the computer device determines the ratio of the change amount of the pressure at the wellhead of the first well within the first time period to the first duration as the rate of change of the pressure at the wellhead of the first well within the first time period.

[0079] S304. When the change rate of the pressure at the wellhead of the first well is stable, control the liquid return channel and the first packer to open, so that the liquid permeating into the target reservoir flows back to the wellhead of the first well through the liquid return channel.

[0080] Among them, the stable change rate of the pressure means that the change rate of the pressure is less than the preset change rate. For example, within a preset time period, the change rates of the pressure at any two moments are both less than the preset change rate. The preset change rate can be a value designed according to the oilfield well testing technical specification SY / T6172, and the embodiments of the present application do not limit this.

[0081] During the process of the computer device monitoring the change rate of the pressure at the wellhead of the first well, the computer device continuously judges (or is called monitors) whether the change rate of the pressure at the wellhead of the first well is stable. When the computer device monitors that the change rate of the pressure at the wellhead of the first well is stable, the computer device controls both the liquid return channel and the first packer in the logging device to open. Optionally, the logging device further includes a second packer. When the computer device monitors that the change rate of the pressure at the wellhead of the first well is stable, the computer device also controls the second packer in the logging device to open. Among them, after the first packer and the second packer are opened, the first space from the first packer to the wellhead of the first well, the second space from the first packer to the second packer, and the third space from the second packer to the bottom of the first well are separated. After the liquid return channel is opened, there is a pressure difference between the first space and the second space and the pressure in the second space is greater than that in the first space, and the liquid permeating into the target reservoir flows back to the wellhead of the first well through the liquid return channel. Exemplarily, the schematic diagram after controlling the liquid return channel, the first packer and the second packer to open is as Figure 5 shown. The computer device 200 controls the first packer 102 and the second packer 104 to open through the cable 109. The computer device 200 controls the valve 103 to open and then controls the liquid return channel 101 to open through the cable 109. After the first packer 102 and the second packer 104 are opened, they are close to the wellbore of the first well to separate the first space from the first packer to the wellhead of the first well, the second space from the first packer to the second packer, and the third space from the second packer to the bottom of the first well.

[0082] In an alternative embodiment, the logging device further includes a valve for controlling the opening or closing of the liquid return channel. When the valve is open, the liquid return channel is open. When the valve is closed, the liquid return channel is closed. The computer device controls the opening of the liquid return channel by controlling the opening of the valve. For example, when the valve is open, the liquid return channel is open, the pressure between the first packer and the second packer is greater than the pressure between the first packer and the wellhead of the first well, and the liquid in the target reservoir flows back to the wellhead of the first well through the liquid return channel. When the valve is closed, the liquid return channel is closed, and the liquid in the target reservoir cannot flow back to the wellhead of the first well through the liquid return channel.

[0083] In an alternative embodiment, the valve is an electrically controlled valve. The computer device sends an opening signal to the valve, and the valve receives the opening signal and opens according to the opening signal. In an alternative embodiment, the logging device further includes a first opening and a second opening. The first opening, the first packer, and the second opening are sequentially distributed along the height direction of the logging device. The valve is located between the first opening and the second opening. The liquid return channel includes the first opening, the second opening, and the inner cavity of the logging device. For example, the liquid return channel is formed by the first opening, the second opening, and the inner cavity of the logging device. After the computer device controls the valve to open, the pressure between the first packer and the second packer is greater than the pressure between the first packer and the wellhead of the first well, and the liquid permeating into the target reservoir flows back to the wellhead of the first well through the first opening, the first packer, and the second opening.

[0084] In an alternative embodiment, both the first packer and the second packer are electrically controlled packers. The second packer, the first opening, and the first packer are sequentially distributed along the height direction of the logging device. The first packer and the second packer are located on both sides of the target reservoir. When the computer device monitors that the rate of change of the pressure at the wellhead of the first well is stable, the computer device controls the first packer and the second packer to open. For example, the computer device sends an opening signal to the first packer and the second packer, and the first packer and the second packer open after receiving the opening signal.

[0085] S305. During the process of liquid reflux, monitor the pressure difference on both sides of the first packer. When the monitored pressure difference on both sides of the first packer reaches the pressure difference threshold, control the closing of the liquid return channel.

[0086] In an alternative embodiment, the logging device further includes a first pressure sensor and a second pressure sensor. The first pressure sensor and the second pressure sensor are located on both sides of the first packer. The computer device monitors the pressure difference on both sides of the first packer through the first pressure sensor and the second pressure sensor. During the process of the computer device detecting the pressure difference on both sides of the first packer, the computer device continuously judges (or monitors) whether the pressure difference on both sides of the first packer reaches the pressure difference threshold. In a specific embodiment, the first pressure sensor is located above the first packer, and the second pressure sensor is located below the first packer. The computer device collects the pressure above the first packer through the first sensor, and the computer device collects the pressure below the first packer through the second sensor. The computer device determines the pressure difference on both sides of the first packer according to the pressure collected by the first pressure sensor and the pressure collected by the second pressure sensor at the same moment, and judges whether the pressure difference reaches the pressure difference threshold. When it is monitored that the pressure difference on both sides of the first packer reaches the pressure difference threshold, the logging device closes the return liquid channel by controlling the valve. For example, the computer device sends a closing signal to the valve, and the electrically controlled valve closes after receiving the electrically controlled signal. Herein, the pressure difference on both sides of the first packer reaching the pressure difference threshold means that the pressure difference on both sides of the first packer is greater than or equal to the pressure threshold.

[0087] In an alternative embodiment, the computer device can also start monitoring the pressure difference on both sides of the first packer after the logging device is lowered into the well and before injecting liquid into the first well. When the computer device monitors that the pressure difference on both sides of the first packer is stable, it indicates that the first packer has good sealing performance and well testing preprocessing can be carried out; when the computer device monitors that the pressure difference on both sides of the first packer is unstable, it indicates that there is a problem with the sealing performance of the first packer. The computer device issues an alarm to remind the staff to check the first packer, and after the staff checks and repairs the first packer, then carry out well testing preprocessing.

[0088] In summary, for the well testing preprocessing method provided by the embodiments of the present application, after a logging device including a liquid return channel and a first packer is lowered into the first well, the computer device controls the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the wellbore wall of the first well into the target reservoir. During the process of the liquid injection device injecting liquid into the first well, the computer device monitors the pressure at the wellhead of the first well. When it is monitored that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device controls the liquid injection device to stop injecting liquid into the first well and monitors the rate of change of the pressure at the wellhead of the first well. When it is monitored that the rate of change of the pressure at the wellhead of the first well is stable, the computer device controls the liquid return channel and the first packer to open, so that the liquid penetrating into the target reservoir flows back to the wellhead of the first well through the liquid return channel. During the process of the liquid flowing back, the computer device monitors the pressure difference between both sides of the first packer. When it is monitored that the pressure difference between both sides of the first packer reaches the pressure difference threshold, the computer device controls the liquid return channel to close. By preprocessing the first well in such a preprocessing manner, conditions can be created for well testing. For example, a sufficiently large pressure difference can be ensured to be formed inside and outside the target reservoir in the first well. After preprocessing the first well through the technical solution provided by the present application, the difficulty of well testing can be reduced and the well testing effect can be improved.

[0089] In an optional embodiment, the well testing preprocessing method provided by the present application creates conditions for well testing. After completing the above steps S301 to S305, well testing can be performed on the first well to obtain well testing data, and the computer device determines the production capacity and reservoir parameters of the first well by analyzing the well testing data. After using a controllable shock wave instrument to perform reservoir stimulation on the first well, after performing the above steps S301 to S305 to create conditions for well testing, well testing can be performed on the first well after reservoir stimulation to obtain well testing data, and the computer device determines the production capacity and reservoir parameters of the first well after reservoir stimulation by analyzing the well testing data of the first well after reservoir stimulation. The computer device determines the effect of reservoir stimulation by analyzing the well testing data of the first well before reservoir stimulation and the well testing data of the first well after reservoir stimulation. In a specific embodiment, well testing is performed by performing a pressure buildup test on the first well. During the process of performing the pressure buildup test, a double logarithm curve that meets the requirements of the oilfield well testing technical specification SY / T6172 is obtained, and the production capacity and reservoir parameters of the first well are obtained by analyzing the double logarithm curve. Optionally, a connecting pipe is arranged in the first well, one end is connected to the second opening, and the other end is connected to a collection device on the ground. The collection device is used to collect the liquid flowing back to the wellhead of the first well through the liquid return device, and the production capacity and reservoir parameters of the first well are determined by analyzing the liquid to facilitate the pressure buildup test.

[0090] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0091] Please refer to Figure 6 which shows a schematic diagram of a well test pretreatment device 600 provided by an embodiment of the present application. The well test pretreatment device 600 is a computer device or a functional component deployed in the computer device. The well test pretreatment device 600 is used to execute Figure 3 the well test pretreatment method provided by the embodiment shown in Figure 6 As shown in

[0092] The control module 601 is used to control the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the well wall of the first well into the target reservoir. Among them, a logging device is lowered into the first well, and the logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer;

[0093] The monitoring module 602 is used to monitor the pressure at the wellhead of the first well during the process of injecting the liquid into the first well;

[0094] The control module 601 is further used to control the liquid injection device to stop injecting the liquid into the first well when it is monitored that the pressure at the wellhead of the first well reaches the pressure threshold;

[0095] The monitoring module 602 is further used to monitor the rate of change of the pressure at the wellhead of the first well after controlling the liquid injection device to stop injecting the liquid into the first well;

[0096] The control module 601 is further used to control the liquid return channel and the first packer to open when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel;

[0097] The monitoring module 602 is further used to monitor the pressure difference between both sides of the first packer during the process of the liquid flowing back;

[0098] The control module 601 is further used to control the liquid return channel to close when it is monitored that the pressure difference between both sides of the first packer reaches the pressure difference threshold.

[0099] Optionally, the logging device further includes a valve, and the valve is used to control the opening or closing of the liquid return channel;

[0100] The control module 601 is specifically used to control the valve to open to control the liquid return channel to open when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable.

[0101] Optionally, the logging device further includes a first opening and a second opening. The first opening, the first packer, and the second opening are sequentially distributed along the height direction of the logging device. The valve is located between the first opening and the second opening. The liquid return channel includes the first opening, the second opening, and the inner cavity of the logging device.

[0102] Optionally, the logging device further includes a second packer. The second packer, the first opening, and the first packer are sequentially distributed along the height direction of the logging device. The first packer and the second packer are located on both sides of the target reservoir. The control module 601 is further configured to control the second packer to open when it monitors that the change rate of the pressure at the wellhead of the first well is stable.

[0103] Optionally, the logging device further includes a first pressure sensor and a second pressure sensor. The first pressure sensor and the second pressure sensor are located on both sides of the first packer.

[0104] The monitoring module 602 is specifically configured to monitor the pressure difference on both sides of the first packer through the first pressure sensor and the second pressure sensor.

[0105] In summary, after the logging device including the liquid return channel and the first packer is lowered into the first well in the technical solution provided by the embodiment of the present application, the computer device controls the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates through the well wall of the first well into the target reservoir. During the process of injecting liquid into the first well by the liquid injection device, the computer device monitors the pressure at the wellhead of the first well. When it monitors that the pressure at the wellhead of the first well reaches the pressure threshold, the computer device controls the liquid injection device to stop injecting liquid into the first well and monitors the change rate of the pressure at the wellhead of the first well. When it monitors that the change rate of the pressure at the wellhead of the first well is stable, the computer device controls the liquid return channel and the first packer to open, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel. During the process of liquid reflux, the computer device monitors the pressure difference on both sides of the first packer. When it monitors that the pressure difference on both sides of the first packer reaches the pressure difference threshold, the computer device controls the liquid return channel to close. By preprocessing the first well in such a preprocessing method, conditions can be created for well testing. For example, a sufficiently large pressure difference can be ensured between the inside and outside of the target reservoir in the first well. After preprocessing the first well through the technical solution provided by the present application, the difficulty of well testing can be reduced and the well testing effect can be improved.

[0106] The embodiment of the present application provides a well testing preprocessing device, including a memory and a processor. The memory is used to store a computer program. The processor is used to execute the computer program stored in the memory so that the well testing preprocessing device executes the well testing preprocessing method provided in the above embodiment.

[0107] As an example, please refer toFigure 7 , which shows a schematic diagram of another well test preprocessing device 700 provided by an embodiment of the present application. The well test preprocessing device 700 is a computer device or a functional component deployed in a computer device. The computer device can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc. The well test preprocessing device 700 is used to execute Figure 2 the method provided by the embodiment shown.

[0108] Generally, the well test preprocessing device 700 includes: a processor 701 and a memory 702.

[0109] The processor 701 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 701 may be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 701 may include, but is not limited to, a central processing unit (CPU). In some embodiments, the processor 701 may be integrated with a graphics processing unit (GPU), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. The processor 701 may also include an artificial intelligence (AI) processor to process computational operations related to machine learning.

[0110] The memory 702 includes one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory 702 may further include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In some embodiments, the non-transitory computer-readable storage media in the memory 702 is used to store at least one instruction, and the at least one instruction is used to be executed by the processor 701 to implement the well test preprocessing method provided by the embodiment of the present application.

[0111] In some embodiments, the volume determination device 700 may further optionally include: a peripheral device interface 703 and at least one peripheral device. The processor 701, the memory 702, and the peripheral device interface 703 may be connected by a bus or signal lines. Each peripheral device may be connected to the peripheral device interface 703 through a bus, signal lines, or a circuit board. The peripheral device may include at least one of a radio frequency circuit 704, a display screen 705, a camera 706, an audio circuit 707, a positioning component 708, and a power supply 709.

[0112] The peripheral device interface 703 can be used to connect at least one peripheral device related to input / output (I / O) to the processor 701 and the memory 702. In some embodiments, the processor 701, the memory 702, and the peripheral device interface 703 are integrated on the same chip or circuit board; in some embodiments, any one or two of the processor 701, the memory 702, and the peripheral device interface 703 can be implemented on separate chips or circuit boards, and this embodiment does not limit this.

[0113] The radio frequency circuit 704 is used to receive and transmit radio frequency (RF) signals, also known as electromagnetic signals. The radio frequency circuit 704 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 704 converts an electrical signal into an electromagnetic signal for transmission, or converts the received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 704 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, and so on. The radio frequency circuit 704 can communicate with other devices through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: the World Wide Web, a metropolitan area network, an intranet, each generation of mobile communication networks (2G, 3G, 4G, and 5G), a wireless local area network, and this application embodiment does not limit this.

[0114] The display screen 705 is used to display a user interface (UI). The UI can include graphics, text, icons, videos, and any combination thereof. When the display screen 705 is a touch display screen, the display screen 705 also has the ability to collect touch signals on or above the surface of the display screen 705. The touch signal can be input to the processor 701 as a control signal for processing. At this time, the display screen 705 can also be used to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or a soft keyboard. In some embodiments, the display screen 705 can be a flexible display screen. Even, the display screen 705 can also be set to an irregular non-rectangular shape, that is, a special-shaped screen. The display screen 705 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED) display screen, and so on.

[0115] The camera component 706 is used to collect images or videos. Optionally, the camera component 706 includes a front camera and a rear camera. Optionally, the computer device is a terminal device such as a smart phone or a tablet computer. Generally, the front camera is disposed on the front panel of the computer device, and the rear camera is disposed on the back of the computer device. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth camera, a wide-angle camera, and a telephoto camera, so as to implement the function of background blurring by fusing the main camera and the depth camera, panoramic shooting and virtual reality (VR) shooting functions or other fusion shooting functions by fusing the main camera and the wide-angle camera. In some embodiments, the camera component 706 may further include a flash. The flash may be a single-color temperature flash or a dual-color temperature flash. The dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation under different color temperatures.

[0116] The audio circuit 707 may include a microphone and a speaker. The microphone is used to collect sound waves of the user and the environment, and convert the sound waves into electrical signals and input them to the processor 701 for processing, or input them to the radio frequency circuit 707 to achieve voice communication. For the purpose of stereo collection or noise reduction, there may be multiple microphones, which are respectively disposed at different parts of the computer device. The microphone may also be an array microphone or an omnidirectional collection type microphone. The speaker is used to convert the electrical signal from the processor 701 or the radio frequency circuit 707 into sound waves. The speaker may be a traditional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for uses such as ranging.

[0117] The positioning component 708 is used to locate the geographical location of the computer device to implement navigation or location based service (LBS). The positioning component 708 may be a positioning component based on the global positioning system (GPS), the Beidou system or the Galileo system.

[0118] The power supply 709 is used to supply power to each component in the computer device. The power supply 709 may be alternating current, direct current, a disposable battery or a rechargeable battery. When the power supply 709 includes a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil.

[0119] In some embodiments, the volume determination device 700 further includes one or more sensors 710. The one or more sensors 710 include, but are not limited to: a fingerprint sensor 711, an optical sensor 712, a proximity sensor 713, a pressure sensor 714, an acceleration sensor 715, and a gyroscope sensor 716.

[0120] The fingerprint sensor 711 is used to collect the user's fingerprint. The processor 701 identifies the user's identity based on the fingerprint collected by the fingerprint sensor 711, or the fingerprint sensor 711 identifies the user's identity based on the collected fingerprint. When the user's identity is identified as a trusted identity, the processor 701 authorizes the user to perform relevant sensitive operations, which include unlocking the screen, viewing encrypted information, downloading software, making payments, and changing settings, etc. The fingerprint sensor 711 can be set on the front, back, or side of the computer device. When there are physical buttons or manufacturer logos on the computer device, the fingerprint sensor 711 can be integrated with the physical buttons or manufacturer logos.

[0121] The optical sensor 712 is used to collect the ambient light intensity. In one embodiment, the processor 701 can control the display brightness of the display screen 705 according to the ambient light intensity collected by the optical sensor 712. Specifically, when the ambient light intensity is high, the display brightness of the display screen 705 is increased; when the ambient light intensity is low, the display brightness of the display screen 705 is decreased. In another embodiment, the processor 701 can also dynamically adjust the shooting parameters of the camera module 707 according to the ambient light intensity collected by the optical sensor 712.

[0122] The proximity sensor 713, also known as a distance sensor, is usually set on the front panel of the display screen 705 of the computer device. The proximity sensor 713 is used to collect the distance between the user and the display screen 705. In one embodiment, when the proximity sensor 713 detects that the distance between the user and the display screen 705 is gradually decreasing, the processor 701 controls the display screen 705 to switch from the lit state to the off state; when the proximity sensor 713 detects that the distance between the user and the display screen 705 is gradually increasing, the processor 701 controls the display screen 705 to switch from the off state to the lit state.

[0123] The pressure sensor 714 can be disposed on the side frame of the computer device and / or the lower layer of the touch display screen 705. When the pressure sensor 714 is disposed on the side frame of the computer device, it can detect the holding signal of the user on the computer device, and the processor 701 can perform left / right hand recognition or quick operation according to the holding signal collected by the pressure sensor 714. When the pressure sensor 714 is disposed on the lower layer of the touch display screen 705, the processor 701 can control the operable controls on the UI interface according to the pressure operation of the user on the touch display screen 705. The operable controls include at least one of button controls, scroll bar controls, icon controls, and menu controls.

[0124] The acceleration sensor 715 can detect the magnitudes of accelerations on the three coordinate axes of the coordinate system established by the computer device. For example, the acceleration sensor 715 can be used to detect the components of the gravitational acceleration on the three coordinate axes. The processor 701 can control the touch display screen 705 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 715. The acceleration sensor 715 can also be used for collecting game or user's motion data.

[0125] The gyroscope sensor 716 can detect the body direction and rotation angle of the computer device. The gyroscope sensor 716 can cooperate with the acceleration sensor 715 to collect the 3D actions of the user on the computer device. According to the data collected by the gyroscope sensor 712, the processor 701 can implement the following functions: motion sensing (such as changing the UI according to the user's tilting operation), image stabilization during shooting, game control, and inertial navigation.

[0126] Those skilled in the art can understand that Figure 7 the structure shown in does not constitute a limitation on the well test pretreatment device 700. The well test pretreatment device 700 may include more or fewer components than those shown in the figure, or combine some components, or adopt different component arrangements.

[0127] The embodiment of the present application provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed (for example, when executed by a computer device, a well test pretreatment device, one or more processors, etc.), all or part of the steps of the well test pretreatment method provided in the above embodiment are implemented.

[0128] The embodiment of the present application provides a computer program product, which includes a program or code. When the program or code is executed (for example, when executed by a computer device, a well test pretreatment device, one or more processors, etc.), all or part of the steps of the well test pretreatment method provided in the above embodiment are implemented.

[0129] It should be understood that the term "at least one" in this application refers to one or more, and "a plurality" refers to two or more. The term "and / or" in this application is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, for the convenience of clear description, in this application, terms such as "first", "second", "third", etc. are used to distinguish identical or similar items with basically the same functions and roles. Those skilled in the art can understand that the terms "first", "second", "third", etc. do not limit the quantity and execution order.

[0130] For different types of embodiments such as the method embodiments and apparatus embodiments provided in the embodiments of this application, they can refer to each other, and this application does not make any limitations in this regard. The order of operations in the method embodiments provided in the embodiments of this application can be appropriately adjusted, and the operations can also be increased or decreased according to the situation. Any method of change that can be easily thought of by any person skilled in the art within the technical scope disclosed in this application should be covered within the protection scope of this application, so no further elaboration will be provided.

[0131] In the corresponding embodiments provided in this application, it should be understood that the disclosed apparatus and the like can be implemented in other constitutive manners. For example, the apparatus embodiments described above are merely illustrative. For example, the division of modules is only a logical function division, and there can be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0132] The modules described as separate components may or may not be physically separated, and the components described as modules may or may not be physical modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] As described above, the above are only exemplary embodiments of this application, but the protection scope of this application is not limited thereto. Any equivalent modifications or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in this application should be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A well test pretreatment method, characterized in that: Applied to a computer device, the method comprises: Controlling the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates into the target reservoir through the well wall of the first well, wherein a logging device is lowered into the first well, the logging device comprises a liquid return channel and a first packer, and the liquid return channel passes through the first packer; During the process of injecting the liquid into the first well, monitoring the pressure at the wellhead of the first well; When it is monitored that the pressure at the wellhead of the first well reaches a pressure threshold, controlling the liquid injection device to stop injecting the liquid into the first well and monitoring the rate of change of the pressure at the wellhead of the first well; When it is monitored that the change rate of the pressure at the wellhead of the first well is stable, controlling the liquid return channel and the first packer to open, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel; During the liquid backflow process, the pressure difference on both sides of the first packer is monitored, and when it is monitored that the pressure difference on both sides of the first packer reaches a pressure difference threshold, the liquid return channel is controlled to be closed.

2. The method according to claim 1, characterized in that The well logging device further comprises a valve, and the valve is used to control the opening or closing of the liquid return channel; Controlling the liquid return channel to open includes: controlling the valve to open.

3. The method according to claim 2, characterized in that The logging device further comprises a first opening and a second opening, wherein the first opening, the first packer and the second opening are sequentially distributed along the height direction of the logging device, and the valve is located between the first opening and the second opening; The liquid return channel includes the first opening, the second opening, and an inner cavity of the well logging device.

4. The method according to claim 3, characterized in that The logging device further comprises a second packer, wherein the second packer, the first opening and the first packer are sequentially distributed along the height direction of the logging device, and the first packer and the second packer are located on both sides of the target reservoir. The method further includes: when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable, controlling the second packer to open.

5. The method according to any one of claims 1 to 4, characterized in that: The logging device further comprises: a first pressure sensor and a second pressure sensor, wherein the first pressure sensor and the second pressure sensor are located on both sides of the first packer; The monitoring of the pressure difference between the two sides of the first packer includes: monitoring the pressure difference between the two sides of the first packer by using the first pressure sensor and the second pressure sensor.

6. A well test pretreatment device, characterized in that: Applied to computer equipment, the well test preprocessing device comprises: a control module and a monitoring module; The control module is used to control the liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates into the target reservoir through the well wall of the first well, wherein a logging device is lowered into the first well, and the logging device includes a liquid return channel and a first packer, and the liquid return channel passes through the first packer; The monitoring module is used to monitor the pressure at the wellhead of the first well during the process of injecting the liquid into the first well; The control module is further configured to control the liquid injection device to stop injecting the liquid into the first well when it is monitored that the pressure at the wellhead of the first well reaches a pressure threshold; The monitoring module is further used to monitor the rate of change of the pressure at the wellhead of the first well after controlling the liquid injection device to stop injecting the liquid into the first well; The control module is further configured to control the liquid return channel and the first packer to open when the change rate of the pressure at the wellhead of the first well is monitored to be stable, so that the liquid that has penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel; The monitoring module is further used to monitor the pressure difference between the two sides of the first packer during the liquid reflux process; The control module is further configured to control the liquid return channel to close when it is monitored that the pressure difference between the two sides of the first packer reaches a pressure difference threshold.

7. The well testing pretreatment device according to claim 6, characterized in that: The well logging device further comprises a valve, and the valve is used to control the opening or closing of the liquid return channel; The control module is specifically used to control the valve to open when it is monitored that the change rate of the pressure at the wellhead of the first well is stable, so as to control the liquid return channel to open.

8. The well testing pretreatment device according to claim 7, characterized in that: The logging device also includes a first opening and a second opening. The first opening, the first packer and the second opening are distributed in sequence along the height direction of the logging device, and the valve is located between the first opening and the second opening. The return liquid channel includes the first opening, the second opening and the inner cavity of the logging device.

9. The well testing pretreatment device according to claim 8, characterized in that: The logging device also includes a second packer, and the second packer, the first opening and the first packer are distributed in sequence along the height direction of the logging device. The first packer and the second packer are located on both sides of the target reservoir. The control module is also used to control the second packer to open when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable.

10. The well testing pretreatment device according to any one of claims 6 to 9, characterized in that: The logging device further comprises: a first pressure sensor and a second pressure sensor, wherein the first pressure sensor and the second pressure sensor are located on both sides of the first packer; The monitoring module is specifically used to monitor the pressure difference between the two sides of the first packer through the first pressure sensor and the second pressure sensor.

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