Well test pre-processing method and apparatus

Abstract

The application discloses a well testing pretreatment method and device, and belongs to the field of oilfield development. The method is applied to a computer device and comprises the following steps: controlling a liquid injection device to inject liquid into a first well, so that the liquid injected into the first well penetrates into a target reservoir through a well wall of the first well; monitoring the pressure at the well mouth of the first well during the injection of the liquid into the first well; when the pressure at the well mouth of the first well reaches a pressure threshold, controlling the liquid injection device to stop injecting liquid into the first well and monitoring the change rate of the pressure at the well mouth of the first well; when the change rate of the pressure at the well mouth of the first well is stable, controlling a liquid return channel and a first packer to be opened, so that the liquid penetrating into the target reservoir returns to the well mouth of the first well through the liquid return channel; and monitoring the pressure difference on both sides of the first packer during the liquid return, and when the pressure difference on both sides of the first packer reaches a pressure difference threshold, controlling the liquid return channel to be closed. The application can improve the well testing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield development, in particular to a well testing pretreatment method and device. BACKGROUND

[0002] In order to determine the production capacity of a well and reservoir parameters, well testing needs to be performed, but in actual well testing, for reservoirs with low permeability and poor flow conductivity, the current well testing technology is greatly affected by wellbore storage effect, the testing time is long, and the well testing effect is poor. SUMMARY

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

[0004] In a first aspect, a well testing pretreatment method is provided, applied to a computer device, and the method comprises:

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

[0006] monitoring the pressure at the wellhead of the first well during the injection of the liquid into the first well;

[0007] when the pressure at the wellhead of the first well is monitored to reach 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;

[0008] when the rate of change of the pressure at the wellhead of the first well is monitored to be stable, controlling the liquid return channel and the first packer to be opened, so that the liquid that penetrates into the target reservoir flows back to the wellhead of the first well through the liquid return channel;

[0009] monitoring the pressure difference on both sides of the first packer during the flow back of the liquid, and when the pressure difference on both sides of the first packer is monitored to reach a pressure difference threshold, controlling the liquid return channel to be closed.

[0010] Optionally, the 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 be opened comprises controlling the valve to be opened.

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

[0012] The fluid return channel comprises the first opening, the second opening and an inner cavity of the logging device.

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

[0014] Optionally, the logging device further comprises 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.

[0015] The monitoring of the pressure difference on both sides of the first packer comprises: monitoring the pressure difference on both sides of the first packer by the first pressure sensor and the second pressure sensor.

[0016] In a second aspect, a well testing pretreatment device is provided, applied to a computer device, and comprising a control module and a detection module.

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

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

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

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

[0021] The control module is further configured to control the liquid return channel and the first packer to be opened 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 permeated into the target reservoir is returned to the wellhead of the first well through the liquid return channel.

[0022] The monitoring module is further configured to monitor the pressure difference between the two sides of the first packer during the liquid return.

[0023] The control module is further configured to control the liquid return channel to be closed when it is monitored that the pressure difference between the two sides of the first packer reaches a pressure difference threshold.

[0024] Optionally, the logging device further comprises a valve configured to control the opening or closing of the liquid return channel; and the control module is specifically configured to control the valve to be opened to control the liquid return channel to be opened when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable.

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

[0026] Optionally, the logging device further comprises a second packer, the second packer, the first opening, and the first packer are sequentially arranged along the height direction of the logging device, and the first packer and the second packer are located on the two sides of the target reservoir; and the control module is further configured to control the second packer to be opened when it is monitored that the rate of change of the pressure at the wellhead of the first well is stable.

[0027] Optionally, the logging device further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor are located on the two sides of the first packer.

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

[0029] In a third aspect, a well testing pretreatment device is provided, comprising a memory and a processor.

[0030] The memory is configured to store a computer program.

[0031] The processor is configured to execute the computer program stored in the memory to enable the well testing pretreatment device to perform the well testing pretreatment method provided in the first aspect or any optional implementation manner of the first aspect.

[0032] In a fourth aspect, a well logging device is provided, comprising: a fluid return channel and a first packer, the fluid return channel passing through the first packer.

[0033] Optionally, the well logging device further comprises a valve, the valve being configured to control opening or closing of the fluid return channel.

[0034] Optionally, the well logging device further comprises a first opening and a second opening, the first opening, the first packer and the second opening being sequentially arranged along a height direction of the well logging device, and the valve is located between the first opening and the second opening.

[0035] The fluid return channel comprises the first opening, the second opening and an inner cavity of the well logging device.

[0036] Optionally, the well logging device further comprises a second packer, the second packer, the first opening and the first packer being sequentially arranged along the height direction of the well logging device.

[0037] Optionally, the well logging device further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor being located on two sides of the first packer, and the first pressure sensor and the second pressure sensor are configured to collect pressure on two sides of the first packer.

[0038] In a fifth aspect, a computer device is provided, which can be a smartphone, a tablet computer, a notebook computer or a desktop computer, etc., the computer device comprising the well testing preprocessing device provided in the second aspect or any optional implementation manner of the second aspect, or the computer device comprising the well testing preprocessing device provided in the third aspect.

[0039] In a sixth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a computer program, the computer program being executed to implement the well testing preprocessing method provided in the first aspect or any optional implementation manner of the first aspect.

[0040] In a seventh aspect, a computer program product is provided, the computer program product comprising a program or code, the program or code being executed to implement the well testing preprocessing method provided in the first aspect or any optional implementation manner of the first aspect.

[0041] The technical scheme provided in the present application has the following beneficial effects:

[0042] The technical scheme provided in the application comprises the following steps: after a logging device comprising a liquid return channel and a first packer is lowered into a first well, a computer device controls a liquid injection device to inject liquid into the first well, so that the liquid injected into the first well penetrates into a target reservoir through the well wall of the first well. The computer device monitors the pressure at the wellhead of the first well during the process of injecting liquid into the first well by the liquid injection device. When 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 rate of change of the pressure at the wellhead of the first well. When the rate of change of the pressure at the wellhead of the first well stabilizes, the computer device controls the liquid return channel and the first packer to open, so that the liquid penetrating into the target reservoir returns to the wellhead of the first well through the liquid return channel. During the process of returning the liquid, the computer device monitors the pressure difference on both sides of the first packer. When the pressure difference on both sides of the first packer reaches a pressure difference threshold, the computer device controls the liquid return channel to close. Through the pretreatment of the first well in this way, conditions for well testing can be created, for example, a large enough pressure difference between the inside and outside of the target reservoir in the first well can be ensured. After the first well is pretreated by the technical scheme provided in the application, the difficulty of well testing can be reduced, and the effect of well testing can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

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

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

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

[0047] Figure 4 is a scene diagram of well testing pretreatment provided by an embodiment of the application;

[0048] Figure 5 is another scene diagram of well testing pretreatment provided by an embodiment of the application;

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

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

[0051] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. DETAILED DESCRIPTION

[0052] For the purposes of the present application, the technical solutions and advantages thereof are more apparent, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not 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 work fall within the scope of the present application.

[0053] With the progress of exploration technology and petroleum engineering technology, unconventional oil and gas reservoirs, such as tight oil reservoirs and shale oil and gas reservoirs, have become one of the important oil and gas fields in China. The sweet spot reservoirs (i.e. reservoirs with economic value for oil and gas enrichment) of unconventional oil and gas reservoirs have the characteristics of low porosity, low permeability, and poor flow conductivity, and cannot be produced stably. Therefore, it is necessary to artificially create a sufficient pressure difference to promote production, so that the reservoirs need to be reformed to increase the flow conductivity of the reservoirs and realize the development of beneficial production.

[0054] As a reservoir reformation technology, the controllable shock wave technology can be used to make a fracture network in a tight oil reservoir or a shale oil and gas reservoir, increase the flow conductivity thereof, and expand the thermal mass sweep volume. After the reservoir is reformed, the effect of the reservoir reformation needs to be evaluated. Well testing is an important technology for testing and evaluating the physical property parameters of a reservoir. However, for a reservoir with low permeability and poor flow conductivity, the current well testing method is greatly affected by the wellbore storage effect, the testing time is long, it is extremely difficult to appear a radial flow section, and the well testing effect is poor. Downhole shut-in can reduce the influence of the wellbore storage effect on well testing. The current downhole shut-in mode is generally to shut in downhole by pressure or clock, which is difficult to simultaneously ensure downhole stable production, downhole shut-in, and formation of a large enough pressure difference inside and outside the reservoir.

[0055] The embodiment of the present application provides a well testing pretreatment method and device. The well testing pretreatment method is applied to a computer device. For example, the well testing pretreatment method is executed by the computer device or a well testing pretreatment device arranged in the computer device. For example, after a logging device including a fluid 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 into a target reservoir through a well wall of the first well. The computer device monitors the pressure of the wellhead of the first well during the process that the liquid injection device injects liquid into the first well. When the pressure of 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 of the wellhead of the first well. When the change rate of the pressure of the wellhead of the first well is stable, the computer device controls the fluid return channel and the first packer to open, so that the liquid penetrating into the target reservoir returns to the wellhead of the first well through the fluid return channel. During the process that the liquid returns, the computer device monitors the pressure difference on both sides of the first packer. When the pressure difference on both sides of the first packer reaches a pressure difference threshold, the computer device controls the fluid return channel to close. The first well is pretreated in this way, which can create conditions for well testing, for example, can ensure that a large enough pressure difference is formed inside and outside the target reservoir in the first well. After the first well is pretreated by the technical solution provided in the embodiment 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 is introduced below. First, a logging device provided by the embodiment of the present application is introduced.

[0057] Please refer to Figure 1 which shows a schematic diagram of a logging device 100 provided by the embodiment of the present application. As shown in Figure 1 , the logging device 100 includes a fluid return channel 101 and a first packer 102, and the fluid return channel 101 penetrates through the first packer 102. The fluid return channel 101 is used for liquid return, for example, the fluid return channel 101 is used for liquid return in the height direction y of the logging device 100. The first packer 102 is used for sealing a first space from the wellhead of the first well. For example, after the first packer 102 is opened, the first packer 102 tightly abuts 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 shown in Figure 1As shown, the logging device 100 is a hollow structure, and the logging device 100 comprises an inner cavity Q. The logging device 100 further comprises 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 100, and the fluid return channel 101 comprises the first opening 1011, the second opening 1012 and the inner cavity Q of the logging device 100. In an example, the first opening 1011, the second opening 1012 and the inner cavity Q of the logging device 100 constitute the fluid return channel 101, the first opening 1011 is the liquid inlet of the fluid return channel 101, the second opening 1012 is the liquid outlet of the fluid return channel 101, and the fluid return channel 101 is used for the liquid to sequentially pass through the first opening 1011, the inner cavity Q of the logging device 100 and the second opening 1012, and the liquid flows back along the height direction y of the logging device 100.

[0059] As shown in FIG. 1, Figure 1 The logging device 100 further comprises a valve 103, and the valve 103 is used for controlling the opening or closing of the fluid return channel 101. When the valve 103 is open, the fluid return channel 101 is open; when the valve 103 is closed, the fluid return channel 101 is closed. In an example, Figure 1 is a schematic view of the logging device 100 when the valve 103 is in a closed state, Figure 2 is a schematic view of the logging device 100 when the valve 103 is in an 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 fluid return channel 101 is used for the liquid to sequentially pass through the first opening 1011, the inner cavity Q of the logging device 100 and the second opening 1012 to flow back.

[0060] As shown in FIG. 1, Figure 1 The logging device 100 further comprises 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 for sealing a third space from the bottom of the first well to the second packer 104, and, together with the first packer 102, sealing a second space between the first packer 102 and the second packer 104. In an example, the first packer 102 and the second packer 104 are tightly attached to the well wall of the first well after being opened to seal the second space and the third space. Figure 1 is a schematic view of the logging device 100 when the second packer 104 is in a closed state, Figure 2 is a schematic view of the logging device 100 when the second packer 104 is in an open state.

[0061] As shown in FIG. 1, Figure 1As shown, the logging device 100 also 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 are used to collect the pressure on both sides of the first packer 102. Figure 1 Taking the example of 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, 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 pressure 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 optional 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 devices among 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] like Figure 1 As shown, the logging device 100 also 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 distributed sequentially 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 connect the space above the first packer 102 and below the second packer 104.

[0064] In an optional embodiment, the logging device 100 further includes a hydraulic drive module, a flow control module, and a pump-out liquid discharge module (all not shown in the figure). The hydraulic drive module generates high-pressure liquid by pressurizing the liquid inside the hydraulic drive module to drive the operation of other modules in the logging device 100. For example, the hydraulic drive module is located near the first packer, and the high-pressure liquid generated by the hydraulic drive module can open the first packer 102. The flow control module and the pump-out liquid discharge module are used to pump out the liquid in the inner cavity Q of the logging device 100.

[0065] Please refer to Figure 3Fig. 1 shows a flowchart of a well testing pretreatment method according to an embodiment of the present application. The well testing pretreatment method is applied to a computer device. For example, the well testing pretreatment method is executed by the computer device or a well testing pretreatment apparatus deployed in the computer device. Hereinafter, the well testing pretreatment method is taken as an example for illustration. The well testing pretreatment method comprises the following steps S301-S305.

[0066] S301. Controlling a liquid injection apparatus to inject a liquid into a first well, so that the liquid injected into the first well penetrates a target reservoir through a well wall of the first well, wherein a logging apparatus is lowered into the first well, the logging apparatus comprising a liquid return passage and a first packer, the liquid return passage passing through the first packer.

[0067] In the embodiment of the present application, the logging apparatus comprising the liquid return passage and the first packer can be lowered into the first well in advance. For example, refer to the structure of the logging apparatus in Figure 1 and Figure 2 After the logging apparatus is lowered into the first well, the schematic diagram is shown in Figure 4 The computer device 200 is connected with the logging apparatus 100 through the cable 109, so that the computer device 200 is connected with 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 acquires 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 with the liquid injection apparatus, and the computer device 200 sends a first liquid injection signal to the liquid injection apparatus to control the liquid injection apparatus to inject the liquid into the first well.

[0068] The first well penetrates the target reservoir. In an optional embodiment, before the logging apparatus is lowered into the first well, a perforating instrument is used to perforate the well wall of a target section of the first well to improve the penetration of the well wall of the target section, the target section being the well section where the target reservoir is located. After the logging apparatus 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 optional embodiment, the wellhead of the first well is sealed by adding a well cover and a sealing ring to the wellhead of the first well. During the process of injecting the liquid into the first well, the liquid return passage in the logging apparatus is controlled to be in a closed state to prevent the liquid in the first well from flowing back through the liquid return passage.

[0069] In an optional 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. 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 the liquid into the first well. The liquid injection device receives the first liquid injection signal. The liquid injection device starts injecting the liquid into the first well according to the first liquid injection signal. For example, the first liquid injection signal is a start signal of the liquid injection device. The liquid injection device starts running according to the first liquid injection signal to start injecting the liquid into the first well. In an optional embodiment, the liquid injection device is connected to the logging device through a cable. The liquid injection device is internally integrated with a blowout preventer, an injection and discharge control device, and a metering device. The well testing pretreatment device injects the liquid into the first well by controlling the injection and discharge control device. The metering device can determine the amount of the liquid injected into the first well.

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

[0071] S302. During the injection of the liquid into the first well, the pressure at the wellhead of the first well is monitored.

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

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

[0074] In an optional embodiment, the wellhead of the first well is provided with a pressure detection device located in the well. The pressure detection device 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 a pressure threshold, the liquid injection device is controlled to stop injecting the liquid into the first well, and the rate of change of the pressure at the wellhead of the first well is monitored.

[0076] In the process of monitoring the pressure of the wellhead of the first well by the computer device, the computer device continuously determines (or monitors) whether the pressure of the wellhead of the first well reaches a pressure threshold. When the computer device monitors that the pressure of 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 of the wellhead of the first well. Wherein, the pressure of the wellhead of the first well reaching the pressure threshold means that the pressure of 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, which is the maximum pressure that the formation can withstand. When the pressure of the formation exceeds the formation fracture pressure, the formation will be broken.

[0077] In an optional embodiment, when the computer device monitors that the pressure of 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 a shutdown signal of the liquid injection device, and the liquid injection device stops running to stop injecting the liquid into the first well according to the second liquid injection signal.

[0078] Wherein, the rate of change of the pressure is the change amount of the pressure in a unit of time, and when the computer device monitors that the pressure of the wellhead of the first well reaches the pressure threshold, the computer device starts to monitor the rate of change of the pressure of the wellhead of the first well. For example, the computer device monitors the pressure of the wellhead of the first well, and the computer device determines the rate of change of the pressure of the wellhead of the first well according to the pressure of the wellhead of the first well at different times. For example, the computer device determines the change amount of the pressure of the wellhead of the first well within a time period defined by any two times according to the pressure of the wellhead of the first well at the any two times, and the computer device determines the rate of change of the pressure of the wellhead of the first well within the time period according to the change amount of the pressure of the wellhead of the first well within the time period. For example, when the computer device monitors that the pressure of the wellhead of the first well reaches the pressure threshold, the computer device obtains a first pressure of the wellhead of the first well at a first time and a second pressure of the wellhead of the first well at a second time through the pressure detection device arranged at the wellhead of the first well. Taking the time period defined by the first time and the second time as a first time period and the length of the first time period as a first length as an example, one of the first time and the second time is the starting time of the first time period, and the other is the ending 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 of the wellhead of the first well within the first time period, and the computer device determines the rate of change of the pressure of the wellhead of the first well within the first time period as the ratio of the change amount of the pressure of the wellhead of the first well within the first time period to the first length.

[0079] S304. When the rate of change of the pressure of the wellhead of the first well is stable, the computer device controls the opening of the flowback passage and the first packer, so that the liquid permeated into the target reservoir flows back to the wellhead of the first well through the flowback passage.

[0080] The rate of change of the pressure being stable means that the rate of change of the pressure is less than a preset rate of change. For example, the rate of change of the pressure at any two time points within a preset time period is less than the preset rate of change. The preset rate of change can be a value designed according to the Oilfield Well Testing Technical Specification SY / T6172, which is not limited in the embodiments of the present application.

[0081] In the process of monitoring the rate of change of the pressure of the wellhead of the first well by the computer device, the computer device constantly judges (or monitors) whether the rate of change of the pressure of the wellhead of the first well is stable. When the computer device monitors that the rate of change of the pressure of the wellhead of the first well is stable, the computer device controls the opening of the flowback passage and the first packer in the logging device. Optionally, the logging device further comprises a second packer, and when the computer device monitors that the rate of change of the pressure of the wellhead of the first well is stable, the computer device further controls the opening of the second packer in the logging device. After the opening of the first packer and the second packer, 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 well bottom of the first well are separated, and after the opening of the flowback passage, there is a pressure difference between the first space and the second space, and the pressure of the second space is greater than that of the first space, so that the liquid permeated into the target reservoir flows back to the wellhead of the first well through the flowback passage. For example, a schematic diagram after the control of the opening of the flowback passage, the first packer and the second packer is shown in FIG. 2. Figure 5 As shown in FIG. 2, the computer device 200 controls the opening of the first packer 102 and the second packer 104 through the cable 109, and controls the opening of the flowback passage 101 by controlling the opening of the valve 103 through the cable 109, and after the opening of the first packer 102 and the second packer 104, the first packer 102 and the second packer 104 tightly adhere to the well wall of the first well to separate the first space from the first packer 102 to the wellhead of the first well, the second space from the first packer 102 to the second packer 104, and the third space from the second packer 104 to the well bottom of the first well.

[0082] In an optional embodiment, the well logging device further comprises a valve configured to control opening or closing of the backflow passage. The backflow passage is open when the valve is open. The backflow passage is closed when the valve is closed. The computer device controls the backflow passage to be open by controlling the valve to be open. For example, when the valve is open, the backflow passage 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 backflow passage. When the valve is closed, the backflow passage is closed, and the liquid in the target reservoir cannot flow back to the wellhead of the first well through the backflow passage.

[0083] In an optional embodiment, the valve is an electrically controlled valve, the computer device sends an opening signal to the valve, the valve receives the opening signal, and the valve opens according to the opening signal. In an optional embodiment, the well logging device further comprises a first opening and a second opening, the first opening, the first packer, and the second opening are sequentially arranged along the height direction of the well logging device, the valve is located between the first opening and the second opening, and the backflow passage comprises the first opening, the second opening, and the inner cavity of the well logging device, for example, the backflow passage is formed by the first opening, the second opening, and the inner cavity of the well logging device. After the computer device controls the valve to be 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 optional embodiment, the first packer and the second packer are both electrically controlled packers, the second packer, the first opening, and the first packer are sequentially arranged 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 when the computer device detects that the rate of change of the pressure of the wellhead of the first well is stable, the computer device controls the first packer and the second packer to be 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. In the process of flowing back of the liquid, the pressure difference between the two sides of the first packer is monitored, and when it is detected that the pressure difference between the two sides of the first packer reaches a pressure difference threshold, the backflow passage is controlled to be closed.

[0086] In optional embodiments, the logging device further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor are located on two sides of the first packer, and the computer device monitors the pressure difference on two sides of the first packer through the first pressure sensor and the second pressure sensor. In the process of detecting the pressure difference on two sides of the first packer, the computer device constantly determines (or monitors) whether the pressure difference on two sides of the first packer reaches a pressure difference threshold. In specific embodiments, 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, collects the pressure below the first packer through the second sensor, determines the pressure difference on two 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 time, and determines whether the pressure difference reaches the pressure difference threshold. When the computer device monitors that the pressure difference on two sides of the first packer reaches the pressure difference threshold, the logging device controls the valve to close to control the liquid return channel to close, for example, the computer device sends a closing signal to the valve, and the electrically controlled valve closes after receiving the electric control signal. The pressure difference on two sides of the first packer reaching the pressure difference threshold means that the pressure difference on two sides of the first packer is greater than or equal to the pressure threshold.

[0087] In optional embodiments, the computer device can also start monitoring the pressure difference on two sides of the first packer after the logging device is lowered and before the liquid is injected into the first well. When the computer device monitors that the pressure difference on two sides of the first packer is stable, it means that the first packer has good sealing performance, and well testing pretreatment can be performed. When the computer device monitors that the pressure difference on two sides of the first packer is unstable, it means that the sealing performance of the first packer has a problem, and the computer device issues an alarm to remind the staff to check the first packer. After the staff checks and repairs the first packer, well testing pretreatment is performed.

[0088] In summary, the well testing pretreatment method provided in the embodiments of the present application, after the logging device including the liquid return channel and the 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 into the target reservoir through the well wall of the first well. The computer device monitors the pressure at the wellhead of the first well during the process of injecting liquid into the first well by the liquid injection device. When 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 the rate of change of the pressure at the wellhead of the first well stabilizes, 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 backflow, the computer device monitors the pressure difference on both sides of the first packer. When 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 such a pretreatment method, the first well is pretreated, which can create conditions for well testing, for example, it can ensure that a large enough pressure difference is formed inside and outside the target reservoir in the first well. After the first well is pretreated by the technical solution provided in the present application, the difficulty of well testing can be reduced, and the well testing effect can be improved.

[0089] In optional embodiments, the well testing pretreatment method provided in the present application creates conditions for well testing, after the above steps S301 to S305 are completed, the first well can be tested 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 the reservoir of the first well is reformed using the controllable shock wave instrument, the above steps S301 to S305 are performed to create conditions for well testing, and then the first well after reservoir reform can be tested to obtain well testing data, and the computer device determines the production capacity and reservoir parameters of the first well after reservoir reform by analyzing the well testing data of the first well after reservoir reform. The computer device determines the effect of reservoir reform by analyzing the well testing data of the first well before reservoir reform and the well testing data of the first well after reservoir reform. In specific embodiments, the well testing is performed by pressure buildup test on the first well, and a double logarithmic curve meeting the requirements of Oilfield Well Testing Technical Specification SY / T6172 is obtained during the pressure buildup test, and the production capacity and reservoir parameters of the first well are obtained by analyzing the double logarithmic curve. Optionally, a connecting pipe is arranged in the first well, one end of which is connected to the second opening and the other end is connected to a collecting device on the ground, the collecting device is used to collect the liquid flowing back to the wellhead of the first well through the liquid return device, and the liquid is analyzed to assist in determining the production capacity and reservoir parameters of the first well by pressure buildup test.

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

[0091] Please refer to Figure 6 , which shows a schematic diagram of a well testing preprocessing device 600 provided by an embodiment of the present application. The well testing preprocessing device 600 is a computer device or a functional component deployed in the computer device. The well testing preprocessing device 600 is configured to execute the well testing preprocessing method provided by the embodiment shown in Figure 3 . As shown in Figure 6 , the well testing preprocessing device 600 includes a control module 601 and a monitoring module 602.

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

[0093] The monitoring module 602 is configured to monitor a pressure at a wellhead of the first well during the injection of the liquid into the first well.

[0094] The control module 601 is further configured to control the liquid injection device to stop injecting the liquid into the first well when the pressure at the wellhead of the first well reaches a pressure threshold.

[0095] The monitoring module 602 is further configured to monitor a rate of change of the pressure at the wellhead of the first well after the liquid injection device stops injecting the liquid into the first well.

[0096] The control module 601 is further configured to control the liquid return passage and the first packer to open when the rate of change of the pressure at the wellhead of the first well stabilizes, so that the liquid that penetrates into the target reservoir flows back to the wellhead of the first well through the liquid return passage.

[0097] The monitoring module 602 is further configured to monitor a pressure difference between two sides of the first packer during the backflow of the liquid.

[0098] The control module 601 is further configured to control the liquid return passage to close when the pressure difference between the two sides of the first packer reaches a pressure difference threshold.

[0099] Optionally, the logging device further includes a valve configured to control opening or closing of the liquid return passage.

[0100] The control module 601 is specifically configured to control the valve to open to control the liquid return passage to open when the rate of change of the pressure at the wellhead of the first well stabilizes.

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

[0102] Optionally, the logging device further comprises a second packer, the second packer, the first opening and the first packer are sequentially arranged along the height direction of the logging device, and the first packer and the second packer are located on two sides of the target reservoir; the control module 601 is further configured 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.

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

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

[0105] In summary, the technical scheme provided by the embodiments of the present application, after the logging device comprising the liquid return channel and the 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 into the target reservoir through the well wall of the first well. 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 a 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 penetrated into the target reservoir flows back to the wellhead of the first well through the liquid return channel. During the process of liquid backflow, the computer device monitors the pressure difference on two sides of the first packer. When it is monitored that the pressure difference on two sides of the first packer reaches a pressure difference threshold, the computer device controls the liquid return channel to close. By such a pretreatment method, the first well can be pretreated, which can create conditions for well testing, for example, it can ensure that a large enough pressure difference is formed inside and outside the target reservoir in the first well. After the first well is pretreated by the technical scheme provided by the present application, the difficulty of well testing can be reduced, and the well testing effect can be improved.

[0106] The embodiments of the present application provide a well testing pretreatment device, comprising 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 pretreatment device executes the well testing pretreatment method provided by the above-mentioned embodiments.

[0107] As an example, please refer toFigure 7 Fig. 7 shows a schematic diagram of another well testing preprocessing apparatus 700 provided by an embodiment of the present application. The well testing preprocessing apparatus 700 is a computer device or a functional component deployed in a computer device, which can be a smart phone, a tablet computer, a notebook computer or a desktop computer, etc. The well testing preprocessing apparatus 700 is configured to execute the method provided by the embodiment shown in Fig. 6. Figure 2 The method provided by the embodiment shown in Fig. 6.

[0108] Generally, the well testing preprocessing apparatus 700 includes a processor 701 and a memory 702.

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

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

[0111] In some embodiments, the well testing preprocessing apparatus 700 can 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 can be connected through a bus or a signal line. Each peripheral device can be connected to the peripheral device interface 703 through a bus, a signal line or a circuit board. The peripheral device can 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 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 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 interface 703 can be implemented on a separate chip or circuit board, and the present embodiment is not limited in this regard.

[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 a communication network and other communication devices through electromagnetic signals. The radio frequency circuit 704 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. 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 the like. 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, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network, and the like, and the present embodiment is not limited in this regard.

[0114] The display screen 705 is used to display a user interface (UI). The UI can include graphics, text, icons, video, 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 signals can be input as control signals to the processor 701 for processing. At this time, the display screen 705 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. 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 shape, i.e. a special-shaped screen. The display screen 705 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED) display, and the like.

[0115] The camera assembly 706 is configured to capture images or videos. Optionally, the camera assembly 706 includes a front-facing camera and a rear-facing camera. Optionally, the computer device is a terminal device such as a smartphone or a tablet computer. Typically, the front-facing camera is disposed on a front panel of the computer device, and the rear-facing camera is disposed on a back of the computer device. In some embodiments, the rear-facing camera is at least two, which are any one of a main camera, a depth-of-field camera, a wide-angle camera, and a long-focus camera. The main camera and the depth-of-field camera can be fused to realize a background blurring function, the main camera and the wide-angle camera can be fused to realize a panoramic shooting and a virtual reality (VR) shooting function, or other fusion shooting functions. In some embodiments, the camera assembly 706 can further include a flash. The flash can 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 at different color temperatures.

[0116] The audio circuit 707 can include a microphone and a speaker. The microphone is configured to capture sound waves of a user and an environment, and convert the sound waves into an electrical signal input to the processor 701 for processing or input to the radio frequency circuit 707 to realize voice communication. For the purpose of stereo sound collection or noise reduction, the microphone can be multiple, which are respectively disposed at different parts of the computer device. The microphone can also be an array microphone or an omnidirectional collection microphone. The speaker is configured to convert an electrical signal from the processor 701 or the radio frequency circuit 707 into sound waves. The speaker can be a traditional diaphragm speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert an electrical signal into a sound wave audible to humans, but also convert an electrical signal into an inaudible sound wave to humans for ranging purposes.

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

[0118] The power supply 709 is configured to supply power to various components in the computer device. The power supply 709 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 709 includes a rechargeable battery, the rechargeable battery can be a wired charging battery or a wireless charging battery. The wired charging battery is a battery that is charged through a wired line, and the wireless charging battery is a battery that is charged through a wireless coil.

[0119] In some embodiments, the volume determining apparatus 700 further comprises 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 configured to collect a fingerprint of a user. The processor 701 is configured to identify an identity of the user based on the fingerprint collected by the fingerprint sensor 711, or the fingerprint sensor 711 is configured to identify the identity of the user based on the fingerprint collected by the fingerprint sensor 711. When the identity of the user is identified as a trusted identity, the processor 701 is configured to authorize the user to perform a related sensitive operation, which includes unlocking a screen, viewing encrypted information, downloading software, payment, and changing settings, etc. The fingerprint sensor 711 can be disposed on a front face, a back face, or a side face of the computer device. When a physical button or a manufacturer logo is disposed on the computer device, the fingerprint sensor 711 can be integrated with the physical button or the manufacturer logo.

[0121] The optical sensor 712 is configured to collect an ambient light intensity. In one embodiment, the processor 701 is configured to control a display brightness of the display screen 705 based on 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 is further configured to dynamically adjust a shooting parameter of the camera assembly 707 based on the ambient light intensity collected by the optical sensor 712.

[0122] The proximity sensor 713, also referred to as a distance sensor, is usually disposed on a front panel of the display screen 705 of the computer device. The proximity sensor 713 is configured to collect a 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 gradually decreases, the processor 701 is configured to control the display screen 705 to switch from a bright screen state to a dim screen state; when the proximity sensor 713 detects that the distance between the user and the display screen 705 gradually increases, the processor 701 is configured to control the display screen 705 to switch from the dim screen state to the bright screen state.

[0123] The pressure sensor 714 can be arranged at the side frame of the computer device and / or under the touch display screen 705. When the pressure sensor 714 is arranged at the side frame of the computer device, the holding signal of the user to the computer device can be detected, and the left-hand or right-hand recognition or shortcut operation can be performed by the processor 701 according to the holding signal collected by the pressure sensor 714. When the pressure sensor 714 is arranged under the touch display screen 705, the operable control on the UI interface can be controlled by the processor 701 according to the pressure operation of the user to the touch display screen 705. The operable control includes at least one of the button control, the scroll bar control, the icon control and the menu control.

[0124] The acceleration sensor 715 can detect the acceleration magnitude 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 component 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 the landscape view or the portrait view according to the gravitational acceleration signal collected by the acceleration sensor 715. The acceleration sensor 715 can also be used for the collection of the game or the motion data of the user.

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

[0126] Those skilled in the art can understand that the structure shown in the above embodiments does not constitute a limitation on the well testing pretreatment device 700, and the well testing pretreatment device 700 can include more or fewer components than those shown in the figure, or some components can be combined, or different component arrangements can be adopted. Figure 7 The structure shown in the above embodiments does not constitute a limitation on the well testing pretreatment device 700, and the well testing pretreatment device 700 can include more or fewer components than those shown in the figure, or some components can be combined, or different component arrangements can be adopted.

[0127] The computer readable storage medium provided by the embodiments of the present application stores a computer program, and the computer program is executed (for example, executed by a computer device, a well testing pretreatment device, one or more processors, etc.) to implement all or part of the steps of the well testing pretreatment method provided by the above embodiments.

[0128] The computer program product provided by the embodiments of the present application includes a program or code, and the program or code is executed (for example, executed by a computer device, a well testing pretreatment device, one or more processors, etc.) to implement all or part of the steps of the well testing pretreatment method provided by the above embodiments.

[0129] It should be understood that the term "at least one" in the present application refers to one or more, and the term "multiple" refers to two or more. The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, in order to clearly describe, in the present application, "first", "second", "third" and the like are used to distinguish the same or similar items with basically the same function and role. Those skilled in the art can understand that "first", "second", "third" and the like do not limit the quantity and execution order.

[0130] The different types of embodiments such as method embodiments and device embodiments provided by the embodiments of the present application can be mutually referred to, which are not limited by the embodiments of the present application. The order of operation of the method embodiments provided by the embodiments of the present application can be adjusted appropriately, and the operation can also be increased or decreased in response to the situation. Any person skilled in the art can easily think of a method within the technical range disclosed by the present application, which should be covered within the protection scope of the present application, so it is not described again.

[0131] In the corresponding embodiments provided by the present application, it should be understood that the disclosed devices and the like can be realized by other constitutions. For example, the device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of 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 can or can not be physically separated, and the components described as modules can or can not be physical modules. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0133] The above is only an exemplary embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of well test pre-processing, characterized in that, The method is applied to a computer device, and the method comprises: controlling a liquid injection device to inject a liquid into a first well, so that the liquid injected into the first well penetrates into a target reservoir through a well wall of the first well, wherein a logging device is lowered into the first well, the logging device comprising a liquid return channel and a first packer, and the liquid return channel passes through the first packer; monitoring a pressure at a wellhead of the first well during the injection of the liquid into 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 a 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, controlling the liquid return channel and the first packer to be opened, so that the liquid that penetrates into the target reservoir flows back to the wellhead of the first well through the liquid return channel; monitoring a pressure difference on both sides of the first packer during the flow back of the liquid, and when it is monitored that the pressure difference on both sides of the first packer reaches a pressure difference threshold, controlling the liquid return channel to be closed.

2. The method of claim 1, wherein, The logging device further comprises a valve for controlling opening or closing of the liquid return channel. The control of the opening of the liquid return channel comprises: controlling the valve to be opened.

3. The method of claim 2, wherein, The logging device further comprises a first opening and a second opening, the first opening, the first packer and the second opening are sequentially arranged along a height direction of the logging device, and the valve is located between the first opening and the second opening. The liquid return channel comprises the first opening, the second opening and an inner cavity of the logging device.

4. The method of claim 3, wherein, The logging device further comprises a second packer, the second packer, the first opening and the first packer are sequentially arranged 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 comprises: 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 be opened.

5. The method according to any one of claims 1 to 4, wherein The logging device further comprises 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. The monitoring of the pressure difference on both sides of the first packer comprises: monitoring the pressure difference on both sides of the first packer by the first pressure sensor and the second pressure sensor.

6. A well test pre-processing device, characterized by, The well testing pretreatment device is applied to a computer device, and the well testing pretreatment device comprises a control module and a monitoring module. The control module is configured to control a liquid injection device to inject a liquid into a first well, so that the liquid injected into the first well penetrates into a target reservoir through a well wall of the first well, wherein a logging device is lowered into the first well, the logging device comprising a liquid return channel and a first packer, and the liquid return channel passes through the first packer. The monitoring module is configured to monitor a pressure at a wellhead of the first well during the injection of 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 configured to monitor a rate of change of the pressure at the wellhead of the first well after the liquid injection device stops 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 it is monitored that the rate of change of the pressure at the wellhead of the first well stabilizes, so that the liquid permeated into the target reservoir flows back to the wellhead of the first well through the liquid return channel; The monitoring module is further configured to monitor a pressure difference between two sides of the first packer during the liquid flow back; 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 test pre-processor apparatus of claim 6 wherein, The well logging device further comprises a valve configured to control opening or closing of the liquid return channel; The control module is specifically configured 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 stabilizes.

8. The well test pre-processor of claim 7 wherein, The well logging device further comprises a first opening and a second opening, the first opening, the first packer and the second opening are sequentially arranged along a height direction of the well logging device, and the valve is located between the first opening and the second opening; the liquid return channel comprises the first opening, the second opening and an inner cavity of the well logging device.

9. The well test pre-processor of claim 8 wherein, The well logging device further comprises a second packer, the second packer, the first opening and the first packer are sequentially arranged along the height direction of the well logging device, and the first packer and the second packer are located on two sides of the target reservoir; the control module is further configured 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 stabilizes.

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