Target parameter determination method, device and equipment for tight reservoir and storage medium

Abstract

The invention discloses a tight reservoir target parameter determination method, device and equipment and a storage medium, and relates to the field of oil and gas field exploration, and the tight reservoir target parameter determination method comprises the steps that target liquid is injected into a target reservoir, and the target liquid injection amount and first wellhead pressure data before the target reservoir is fractured are measured to determine a wellbore reservoir coefficient; closing the target wellhead based on the first well shut-in time, determining first bottom hole pressure data according to the measured second wellhead pressure data, and determining a target friction resistance coefficient; the target wellhead is opened for liquid flowback, the target wellhead is closed based on the second well shut-in time, and third wellhead pressure data and liquid flow data during well opening and fourth wellhead pressure data within the second well shut-in time are obtained; and determining second bottom hole pressure data based on the target friction resistance coefficient, the third wellhead pressure data and the liquid flow data, and determining third bottom hole pressure data based on the fourth wellhead pressure data so as to determine target parameters. According to the method, the target parameters of the tight reservoir can be rapidly measured.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas field exploration, and in particular to a method, device, equipment and storage medium for determining target parameters of tight reservoirs. Background Art

[0002] When measuring the original formation pressure parameters of tight reservoirs, due to factors such as the poor permeability of tight reservoirs, the conventional microinjection testing technology has a slow filtration rate and a long fracture closure time. The time required to achieve pseudo-radial flow often exceeds 15 days, which greatly affects the well construction cycle. It is only used at the toe end of the main fracturing in a small number of evaluation wells, and its promotion and application are limited.

[0003] Therefore, how to quickly measure the original formation pressure parameters of tight reservoirs is an urgent problem to be solved. Summary of the Invention

[0004] In view of this, the present invention aims to provide a method, apparatus, device, and storage medium for determining target parameters of tight reservoirs, which can achieve rapid determination of the original formation pressure parameters of tight reservoirs. The specific scheme is as follows:

[0005] In a first aspect, the present application discloses a method for determining target parameters of a tight reservoir, comprising:

[0006] injecting a target liquid into a target reservoir, measuring a target liquid injection volume and first wellhead pressure data of the target reservoir before fracturing using a target flow meter and a target pressure meter pre-installed at a target wellhead, and determining a wellbore storage coefficient based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the well corresponding to the target wellhead;

[0007] closing the target wellhead based on a first shut-in time, determining first bottom hole pressure data corresponding to the target wellhead based on second wellhead pressure data measured by the target pressure gauge during the first shut-in time, and determining a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes a perforation friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead;

[0008] opening the target wellhead for liquid flowback based on a preset well opening time, closing the target wellhead based on a second well closing time, and obtaining third wellhead pressure data and liquid flow rate data corresponding to the target wellhead during the preset well opening time and fourth wellhead pressure data corresponding to the target wellhead during the second well closing time;

[0009] Second bottom hole pressure data is determined based on the target friction coefficient, the third wellhead pressure data, and the liquid flow rate data, and third bottom hole pressure data corresponding to the target wellhead is determined based on the fourth wellhead pressure data, so as to determine target parameters corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data; the target parameters include minimum horizontal principal stress and original formation pressure.

[0010] Optionally, before injecting the target liquid into the target reservoir, the target reservoir has not been subjected to fracturing transformation, and the target liquid is clean water or sodium chloride solution.

[0011] Optionally, before injecting the target liquid into the target reservoir, the method further includes:

[0012] The target pressure gauge and the target flow meter are installed at the target wellhead; the target pressure gauge is an electronic pressure gauge programmed to meet the preset pressure accuracy condition and the first preset sampling condition, and the target flow meter is an electronic flow meter programmed to meet the preset flow measurement condition and the second preset sampling condition;

[0013] Installing a target nozzle manifold and installing each target nozzle on the target nozzle manifold; the target nozzle manifold meets a preset pressure condition, and the target nozzle manifold can be installed with target nozzles of different sizes;

[0014] The target nozzle manifold is pressure tested and drained.

[0015] Optionally, determining the target parameter corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data includes:

[0016] determining target stages of the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data, and performing flow pattern analysis on each target stage to determine flow pattern analysis results corresponding to each target stage;

[0017] Determining target parameters corresponding to the target reservoir based on each of the flow state analysis results;

[0018] Among them, the target stages include the wellbore storage stage, the unstable linear flow stage in the fracture, the boundary control flow stage in the fracture, the fracture closure stage, the unstable linear flow stage in the fluid immersion zone, the boundary control flow stage in the fluid immersion zone, and the unstable linear flow stage of formation fluid into the fracture; the flow state analysis results include the time interval and bottom hole pressure data corresponding to the target stage.

[0019] Optionally, determining the target parameters corresponding to the target reservoir based on each of the flow state analysis results includes:

[0020] determining a target curve graph based on a first time interval corresponding to the fracture closure stage and corresponding first target bottom hole pressure data;

[0021] The target crack closure point is determined based on the target curve graph using a G-function analysis method to determine the crack closure time and minimum horizontal principal stress corresponding to the target crack closure point.

[0022] Optionally, determining the target parameters corresponding to the target reservoir based on each of the flow state analysis results includes:

[0023] The target unstable pressure analysis method is used to determine the original formation pressure based on a second time interval corresponding to the unstable linear flow stage of the formation fluid into the fracture and corresponding second target bottom hole pressure data.

[0024] Optionally, the method for determining target parameters of a tight reservoir further includes:

[0025] A target productivity index determination method is used to determine a target productivity index corresponding to the target wellhead based on the original formation pressure.

[0026] In a second aspect, the present application discloses a device for determining target parameters of a tight reservoir, comprising:

[0027] a wellbore storage coefficient determination module, configured to inject a target liquid into a target reservoir, measure a target liquid injection volume and first wellhead pressure data of the target reservoir before fracturing using a target flow meter and a target pressure gauge pre-installed at a target wellhead, and determine a wellbore storage coefficient based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the hole corresponding to the target wellhead;

[0028] a friction coefficient determination module, configured to close the target wellhead based on a first shut-in time, determine first bottom hole pressure data corresponding to the target wellhead based on second wellhead pressure data measured by the target pressure gauge during the first shut-in time, and determine a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes a perforation friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead;

[0029] a target data acquisition module, configured to open the target wellhead for liquid flowback based on a preset well opening time, close the target wellhead based on a second well closing time, and acquire third wellhead pressure data and liquid flow rate data corresponding to the target wellhead during the preset well opening time and fourth wellhead pressure data corresponding to the target wellhead during the second well closing time;

[0030] a target parameter determination module, configured to determine second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data, and the liquid flow rate data, and to determine third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine target parameters corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data; the target parameters include minimum horizontal principal stress and original formation pressure.

[0031] In a third aspect, the present application discloses an electronic device, comprising:

[0032] Memory, used to store computer programs;

[0033] A processor is used to execute the computer program to implement the aforementioned method for determining target parameters of a tight reservoir.

[0034] In a fourth aspect, the present application discloses a computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the aforementioned method for determining target parameters of a tight reservoir.

[0035] In the present application, when determining the target parameters of a tight reservoir, a target liquid is injected into the target reservoir, and a target flow meter and a target pressure gauge pre-installed at a target wellhead are used to determine the target liquid injection volume and the first wellhead pressure data before the target reservoir is fractured, and the wellbore storage coefficient is determined based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the hole corresponding to the target wellhead; the target wellhead is closed based on a first shut-in time, and the first bottom hole pressure data corresponding to the target wellhead is determined based on the second wellhead pressure data measured by the target pressure gauge within the first shut-in time, and the target friction coefficient is determined based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes the borehole friction coefficient corresponding to the target wellhead number and fracture bending friction coefficient; open the target wellhead based on a preset well opening time for liquid return, close the target wellhead based on a second well closing time, and obtain third wellhead pressure data and liquid flow data corresponding to the target wellhead within the preset well opening time and fourth wellhead pressure data corresponding to the target wellhead within the second well closing time; determine second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data and the liquid flow data, and determine third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine target parameters corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data and the third bottom hole pressure data; the target parameters include minimum horizontal principal stress and original formation pressure. It can be seen that the present application first injects the target liquid into the bottom hole tight reservoir (i.e., the target reservoir) corresponding to the target wellhead, and uses the target liquid injection volume and the first wellhead pressure data to determine the injection volume and pressure change of the target wellhead before the formation is opened, thereby determining the wellbore storage coefficient corresponding to the target wellhead, and then determines the first bottom hole pressure data based on the second wellhead pressure data collected during the first well shut-in period, and determines the pore friction coefficient and the fracture bending friction coefficient based on the fitting analysis of the bottom hole pressure change, then opens the target wellhead for liquid backflow to accelerate the fracture closure by backflow, and After the fracture is closed, the target wellhead is closed for pressure recovery, thereby collecting the third wellhead pressure data and liquid flow rate data during the well opening period, and the fourth wellhead pressure data during the second well shut-in period. Finally, the second bottomhole pressure data during the well opening period is determined based on the target friction coefficient, the third wellhead pressure data during the well opening period, and the liquid flow rate data obtained in the aforementioned process. The third bottomhole pressure data during the second well shut-in period is determined based on the fourth wellhead pressure data. The pressure drop data of the backflow process is directly analyzed to obtain the fracture closure pressure, thereby quickly determining the target parameters corresponding to the target reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] Figure 1 This is a flow chart of a method for determining target parameters of a tight reservoir disclosed in this application;

[0038] Figure 2 This is a schematic diagram of the installation of a pressure gauge and flow meter at a target wellhead disclosed in this application;

[0039] Figure 3 Schematic diagram of a relationship curve between flowback time, normalized bottom hole pressure, and normalized bottom hole pressure derivative disclosed in this application;

[0040] Figure 4 A schematic diagram of a relationship curve between flowback time, bottom hole pressure, and bottom hole pressure derivative disclosed in this application;

[0041] Figure 5 This is a schematic structural diagram of a device for determining target parameters of a tight reservoir disclosed in this application;

[0042] Figure 6 This is a structural diagram of an electronic device disclosed in this application. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] When determining the original formation pressure parameters of tight reservoirs, conventional microinjection testing technology suffers from slow filtration rates and long fracture closure times due to factors such as the low permeability of tight reservoirs. This often requires more than 15 days to achieve pseudo-radial flow, significantly impacting well construction cycles. This method is only used at the toe of the main fracturing in a small number of evaluation wells, limiting its widespread application. To address these technical issues, this application discloses a method for determining target parameters for tight reservoirs, enabling rapid determination of the original formation pressure parameters of tight reservoirs.

[0045] See also Figure 1 As shown, an embodiment of the present invention discloses a method for determining target parameters of a tight reservoir, comprising:

[0046] Step S11, injecting a target liquid into a target reservoir, using a target flow meter and a target pressure gauge pre-installed at a target wellhead to measure a target liquid injection volume and a first wellhead pressure data before fracturing the target reservoir, and determining a wellbore storage coefficient based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the hole corresponding to the target wellhead.

[0047] In this embodiment, Figure 2 As shown, to accurately measure wellhead pressure and flow data, before injecting the target fluid into the target reservoir, it is necessary to install injection and flowback testing surface pumping and flowback equipment at the target wellhead. This equipment includes a water tank, injection pump, high-pressure manifold, target flowmeter, target pressure gauge, and nozzle. The target pressure gauge is an electronic pressure gauge programmed to meet preset pressure accuracy conditions and a first preset sampling condition. The target flowmeter is an electronic flowmeter programmed to meet preset flow measurement conditions and a second preset sampling condition. The preset pressure accuracy condition can be a pressure accuracy of no less than 0.03%, and the first preset sampling condition can be a minimum sampling rate of one point per second, ensuring that even small changes in formation pressure can be recorded. The preset flow measurement accuracy condition can be a measurement range of 8 to 50 L / min with an accuracy of ±1%, and the second preset sampling condition can be a minimum sampling rate of one point per second, ensuring that flow changes throughout the entire flowback process are accurately recorded.

[0048] In this embodiment, when installing the target nozzles, the target nozzle manifold is first installed. Each target nozzle is then installed within the target nozzle manifold. The target nozzle manifold is then pressure tested and emptied to ensure smooth pumping and flowback processes. The target nozzle manifold meets preset pressure requirements and can accommodate target nozzles of varying sizes. It is understood that the target nozzle manifold can quickly switch nozzles based on on-site flowback conditions. Prior to injecting the target fluid into the target reservoir, the target reservoir is not subjected to hydraulic fracturing. To save costs, the target fluid can be either water or a sodium chloride solution. After the pressure gauge, flow meter, nozzle manifold and nozzle are installed and meet the operational requirements, the target liquid can be injected into the tight reservoir at the bottom of the hole (i.e., the target reservoir) corresponding to the target wellhead, and the target flow meter and target pressure gauge at the target wellhead are used to measure the target liquid injection volume and the first wellhead pressure data of the target reservoir before fracturing occurs, so as to observe the relationship between the injection volume and pressure change before fracturing the formation, and determine the wellbore storage coefficient of the target wellhead based on the measured first wellhead pressure data and the target liquid injection volume.

[0049] Step S12: closing the target wellhead based on a first shut-in time, determining first bottom hole pressure data corresponding to the target wellhead based on second wellhead pressure data measured by the target pressure gauge during the first shut-in time, and determining a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes a pore friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead.

[0050] In this embodiment, after determining that the tight reservoir at the bottom of the well has been fractured, the injection of the target liquid into the target wellhead can be stopped, and the first well shut-in can be performed based on the first shut-in time. The first shut-in time can be three to five minutes. The second wellhead pressure data collected during this period can be used to determine the first bottom hole pressure data of the target wellhead. Thereafter, a fitting analysis can be performed based on the wellbore storage coefficient and the first bottom hole pressure data obtained in the aforementioned process to determine the target friction coefficient corresponding to the target wellhead. The target friction coefficient includes the pore friction coefficient and the fracture bending friction coefficient.

[0051] Step S13: open the target wellhead based on the preset well opening time for liquid return, close the target wellhead based on the second well closing time, and obtain the third wellhead pressure data and liquid flow data corresponding to the target wellhead within the preset well opening time and the fourth wellhead pressure data corresponding to the target wellhead within the second well closing time.

[0052] In this embodiment, after the first shut-in time has expired, the well can be opened to perform liquid flowback to the target wellhead. After the preset well opening time has expired, the target wellhead is shut down a second time to restore pressure. It is understood that the preset well opening time (i.e., flowback time) can be approximately one hour, and the second shut-in time can be half an hour. After the flowback time has expired, the cracks in the tight reservoir at the bottom of the well caused by the injection of liquid into the bottom of the well have closed. The target pressure gauge and target flowmeter at the target wellhead can then be used to measure the third wellhead pressure and liquid flow rate data corresponding to the target wellhead during the well opening period, and the fourth wellhead pressure data corresponding to the target wellhead during the second shut-in period can be measured.

[0053] Step S14: Determine second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data and the liquid flow rate data, and determine third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine target parameters corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data and the third bottom hole pressure data; the target parameters include minimum horizontal principal stress and original formation pressure.

[0054] In this embodiment, after the liquid flow rate data, the third wellhead pressure data, and the fourth wellhead pressure data are obtained through the aforementioned process, the second bottomhole pressure data can be determined based on the already determined target friction coefficient, the third wellhead pressure data, and the liquid flow rate data, and the third bottomhole pressure data can be determined based on the fourth wellhead pressure data. Thus, the target parameters corresponding to the target reservoir can be determined based on all the bottomhole pressure change data (the first bottomhole pressure data, the second bottomhole pressure data, and the third bottomhole pressure data), wherein the target parameters include the minimum horizontal principal stress (i.e., the fracture closure pressure) and the original formation pressure of the bottomhole tight reservoir.

[0055] In a specific embodiment, determining target parameters corresponding to a target reservoir based on first, second, and third bottomhole pressure data may include: determining target stages of the target reservoir based on the first, second, and third bottomhole pressure data, performing flow pattern analysis on each target stage to determine flow pattern analysis results corresponding to each target stage; determining target parameters corresponding to the target reservoir based on each flow pattern analysis result; wherein the target stages include a wellbore reservoir stage, an unstable linear flow stage within a fracture, a boundary-controlled flow stage within a fracture, a fracture closure stage, an unstable linear flow stage in a fluid immersion zone, a boundary-controlled flow stage in a fluid immersion zone, and an unstable linear flow stage of formation fluid into the fracture; and the flow pattern analysis results include time intervals and bottomhole pressure data corresponding to the target stages. In other words, this embodiment can analyze the target reservoir using pressure data and displacement data from the entire pumping and flowback process, thereby determining each target stage to obtain corresponding flow pattern analysis results, and then determining the target parameters of the target reservoir based on the flow pattern analysis results. To determine each target stage, the relationship between the flowback time and the normalized bottom hole pressure, as well as the relationship between the flowback time and the normalized bottom hole pressure derivative, can be determined based on the pressure data of the entire pumping and flowback process. Figure 3 , and according to Figure 3 And the displacement data in the above process Figure 3 Analysis is performed to determine each target stage and the corresponding flow pattern analysis results.

[0056] The formula for determining the normalized bottom hole pressure and its derivative is as follows:

[0057] ;

[0058] ;

[0059] ;

[0060] in, is the flow-normalized bottom hole pressure, dimensionless; for The derivative of The bottom hole pressure at the start of flowback, in MPa; is the bottom hole flowing pressure, in MPa; is the flowback displacement, in L / min; is the cumulative water production, in L, Return time.

[0061] In this embodiment, the target parameters corresponding to the target reservoir are determined based on the results of each flow state analysis, including: determining a target curve based on the first time interval corresponding to the fracture closure stage and the corresponding first target bottom hole pressure data; using the G function analysis method to determine the target fracture closure point based on the target curve to determine the fracture closure time and minimum horizontal principal stress corresponding to the target fracture closure point. In other words, after determining each target stage, the relationship between the return time and the bottom hole pressure, as well as the relationship between the return time and the bottom hole pressure derivative can be determined based on the first time interval corresponding to the fracture closure stage and the first target bottom hole pressure data, thereby obtaining the following: Figure 4 The target curve is shown in the figure. The G-function analysis method can then be used to determine the crack closure point and crack closure time in the target curve, and the crack closure pressure (i.e., the minimum horizontal principal stress) can be determined based on the crack closure point. When using the G-function analysis method to determine the crack closure point in the target curve, the intersection of the two tangents of the G-function curve can be used to determine whether a clear crack closure point appears in the target curve. If a clear crack closure point appears, the crack can be considered completely closed.

[0062] In this embodiment, target parameters corresponding to the target reservoir are determined based on the results of various flow regime analyses. This includes determining the original formation pressure using a target unstable pressure analysis method based on the second time interval corresponding to the unstable linear flow phase of formation fluid into the fracture (i.e., the pressure recovery phase) and the corresponding second target bottomhole pressure data. Once the original formation pressure is obtained, a target productivity index determination method can be used to determine a target productivity index, such as a liquid production index, corresponding to the target wellhead based on the original formation pressure to assess the engineering geology "sweet spot." Because the construction process is extremely short, typically only two hours, and does not affect the progress of the fracturing test, it is possible to conduct multi-section testing on horizontal wells and identify the engineering geology "sweet spot" of a single well, providing a scientific basis for reserve calculation, fracturing optimization, and guiding rational production allocation.

[0063] It can be seen that the target liquid is first injected into the target wellhead corresponding to the bottom dense reservoir (i.e. the target reservoir), the injection amount and the pressure change of the target wellhead before the stratum is fractured are determined by using the target liquid injection amount and the first wellhead pressure data, so as to determine the wellbore storage coefficient corresponding to the target wellhead, then the first bottom hole pressure data is determined according to the second wellhead pressure data collected during the first shut-in period, and the hole friction coefficient and the fracture bending friction coefficient are determined according to the bottom hole pressure change fitting analysis, then the target wellhead is opened to carry out liquid flowback to accelerate the fracture closure by flowback, and the target wellhead is closed after the fracture closure to carry out pressure recovery, so that the third wellhead pressure data and the liquid flow rate data during the opening period and the fourth wellhead pressure data during the second shut-in period are collected, finally, the second bottom hole pressure data during the opening period is determined according to the target friction coefficient obtained in the foregoing process, the third bottom hole pressure data during the second shut-in period is determined according to the fourth wellhead pressure data, the fracture closure pressure is obtained by directly analyzing the pressure drop data in the flowback process, so that the target parameter corresponding to the target reservoir is quickly determined.

[0064] Referring to Figure 5 It is shown that the application discloses a target parameter determination device for a dense reservoir, which comprises:

[0065] The wellbore storage coefficient determination module 11 is configured to inject a target liquid into a target reservoir, determine the target liquid injection amount before fracturing of the target reservoir and first wellhead pressure data by using a target flowmeter and a target pressure gauge pre-installed at a target wellhead, and determine a wellbore storage coefficient based on the target liquid injection amount and the first wellhead pressure data; the target reservoir is a bottom dense reservoir corresponding to the target wellhead;

[0066] The friction coefficient determination module 12 is configured to close the target wellhead based on a first shut-in time, determine first bottom hole pressure data corresponding to the target wellhead according to second wellhead pressure data measured by the target pressure gauge within the first shut-in time, and determine a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient comprises a hole friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead;

[0067] The target data acquisition module 13 is configured to open the target wellhead to carry out liquid flowback based on a preset opening time, close the target wellhead based on a second shut-in time, and acquire third wellhead pressure data corresponding to the target wellhead within the preset opening time, liquid flow rate data, and fourth wellhead pressure data corresponding to the target wellhead within the second shut-in time;

[0068] The target parameter determination module 14 is used to determine the second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data and the liquid flow rate data, and to determine the third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine the target parameters corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data and the third bottom hole pressure data; the target parameters include the minimum horizontal principal stress and the original formation pressure.

[0069] It can be seen that the present application first injects the target liquid into the bottom hole tight reservoir (i.e., the target reservoir) corresponding to the target wellhead, and uses the target liquid injection volume and the first wellhead pressure data to determine the injection volume and pressure change of the target wellhead before the formation is opened, thereby determining the wellbore storage coefficient corresponding to the target wellhead, and then determines the first bottom hole pressure data based on the second wellhead pressure data collected during the first well shut-in period, and determines the pore friction coefficient and the fracture bending friction coefficient based on the fitting analysis of the bottom hole pressure change, then opens the target wellhead for liquid backflow to accelerate the fracture closure by backflow, and After the fracture is closed, the target wellhead is closed for pressure recovery, thereby collecting the third wellhead pressure data and liquid flow rate data during the well opening period, and the fourth wellhead pressure data during the second well shut-in period. Finally, the second bottomhole pressure data during the well opening period is determined based on the target friction coefficient, the third wellhead pressure data during the well opening period, and the liquid flow rate data obtained in the aforementioned process. The third bottomhole pressure data during the second well shut-in period is determined based on the fourth wellhead pressure data. The pressure drop data of the backflow process is directly analyzed to obtain the fracture closure pressure, thereby quickly determining the target parameters corresponding to the target reservoir.

[0070] In a specific embodiment, the device may further include:

[0071] an equipment installation module, configured to install the target pressure gauge and the target flow meter at the target wellhead; the target pressure gauge is an electronic pressure gauge programmed to meet a preset pressure accuracy condition and a first preset sampling condition; and the target flow meter is an electronic flow meter programmed to meet a preset flow measurement condition and a second preset sampling condition;

[0072] A nozzle installation module is used to install a target nozzle manifold and install each target nozzle on the target nozzle manifold; the target nozzle manifold meets the preset pressure conditions, and the target nozzle manifold can be installed with target nozzles of different sizes;

[0073] The pressure test and emptying module is used to perform pressure test and emptying on the target nozzle manifold.

[0074] In a specific implementation, the target parameter determination module 14 may specifically include:

[0075] a flow pattern analysis submodule, configured to determine target stages of the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data, and perform flow pattern analysis on each target stage to determine flow pattern analysis results corresponding to each target stage;

[0076] a target parameter determination submodule, configured to determine target parameters corresponding to the target reservoir based on each of the flow pattern analysis results;

[0077] Among them, the target stages include the wellbore storage stage, the unstable linear flow stage in the fracture, the boundary control flow stage in the fracture, the fracture closure stage, the unstable linear flow stage in the fluid immersion zone, the boundary control flow stage in the fluid immersion zone, and the unstable linear flow stage of formation fluid into the fracture; the flow state analysis results include the time interval and bottom hole pressure data corresponding to the target stage.

[0078] In a specific implementation, the target parameter determination submodule may specifically include:

[0079] a curve graph determining unit, configured to determine a target curve graph based on a first time interval corresponding to the fracture closure stage and corresponding first target bottom hole pressure data;

[0080] The curve graph analysis unit is used to determine the target crack closure point based on the target curve graph using a G function analysis method to determine the crack closure time and minimum horizontal principal stress corresponding to the target crack closure point.

[0081] In a specific implementation, the target parameter determination submodule may specifically include:

[0082] The original formation pressure determination unit is used to determine the original formation pressure by using a target unstable pressure analysis method and based on a second time interval corresponding to the unstable linear flow stage of the formation fluid into the fracture and corresponding second target bottom hole pressure data.

[0083] In a specific embodiment, the device may further include:

[0084] The productivity index determination module is used to determine the target productivity index corresponding to the target wellhead based on the original formation pressure by using a target productivity index determination method.

[0085] Furthermore, the embodiment of the present application also discloses an electronic device, Figure 6 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content in the diagram should not be considered as any limitation to the scope of application of the present application.

[0086] Figure 6This is a schematic diagram of the structure of an electronic device 20 provided in an embodiment of the present application. The electronic device 20 may include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps of the method for determining target parameters for tight reservoirs disclosed in any of the aforementioned embodiments. Furthermore, the electronic device 20 in this embodiment may be a computer.

[0087] In this embodiment, the power supply 23 is used to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device. The communication protocol it follows is any communication protocol that can be applied to the technical solution of this application and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world. Its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0088] In addition, the memory 22 as a carrier for resource storage can be a read-only memory, random access memory, disk or optical disk, etc. The resources stored thereon can include an operating system 221, a computer program 222, etc., and the storage method can be temporary storage or permanent storage.

[0089] The operating system 221 is used to manage and control the hardware devices and computer program 222 on the electronic device 20, and can be Windows Server, NetWare, Unix, Linux, etc. In addition to including a computer program capable of implementing the method for determining target parameters of a tight reservoir performed by the electronic device 20 as disclosed in any of the aforementioned embodiments, the computer program 222 may further include computer programs capable of implementing other specific tasks.

[0090] Furthermore, this application discloses a computer-readable storage medium for storing a computer program. When executed by a processor, the computer program implements the aforementioned method for determining target parameters for tight reservoirs. The specific steps of this method can be found in the corresponding sections disclosed in the aforementioned embodiments and will not be further elaborated here.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference can be made to the descriptions of the identical or similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the methods.

[0092] Those skilled in the art will further appreciate that the units and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various examples have been described herein in terms of their functionality, which has been described generally and symbolically in flow charts. Having thus described the functionality of the examples, a person of ordinary skill in the art will be able to implement such functions in hardware and / or software, using the means and methods available to those skilled in the art. The examples described herein are not meant to limit the scope of the application, but merely to provide examples of the methods and systems being described.

[0093] The steps of a method or algorithm described in connection with the embodiments disclosed herein can be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0094] Finally, it should be noted that the terms "first", "second", and the like, herein do not denote any order, quantity, combination, or importance, but rather are used to distinguish one element from another, and are more especially used for the purpose of distinction from other elements in the specification. Also, the terms "comprise", "include" or "contain" or any other variant thereof are intended to encompass non-exclusive inclusions, such that processes, methods, articles, or apparatuses that comprise, include, or contain a list of elements are not limited to those elements, but can include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses. Without further limitation, an element defined by the phrase "comprising a... " does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0095] The above has introduced the technical solutions provided by the present application in detail, and the principles and implementation manners of the present application have been described by using specific examples; the above example descriptions are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges can be changed; in conclusion, the content of the present description should not be understood as limiting the present application.

Claims

1. A method for determining target parameters of a tight reservoir, characterized in that: include: injecting a target liquid into a target reservoir, measuring a target liquid injection volume and first wellhead pressure data of the target reservoir before fracturing using a target flow meter and a target pressure meter pre-installed at a target wellhead, and determining a wellbore storage coefficient based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the well corresponding to the target wellhead; closing the target wellhead based on a first shut-in time, determining first bottom hole pressure data corresponding to the target wellhead based on second wellhead pressure data measured by the target pressure gauge during the first shut-in time, and determining a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes a perforation friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead; opening the target wellhead for liquid flowback based on a preset well opening time, closing the target wellhead based on a second well closing time, and obtaining third wellhead pressure data and liquid flow rate data corresponding to the target wellhead during the preset well opening time and fourth wellhead pressure data corresponding to the target wellhead during the second well closing time; determining second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data, and the liquid flow rate data, and determining third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine a target parameter corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data; The target parameters include minimum horizontal principal stress and original formation pressure.

2. The method for determining target parameters of a tight reservoir according to claim 1, wherein: Before injecting the target liquid into the target reservoir, the target reservoir has not been subjected to hydraulic fracturing, and the target liquid is clean water or sodium chloride solution.

3. The method for determining target parameters of a tight reservoir according to claim 1, wherein: Before injecting the target liquid into the target reservoir, the method further comprises: The target pressure gauge and the target flow meter are installed at the target wellhead; the target pressure gauge is an electronic pressure gauge programmed to meet the preset pressure accuracy condition and the first preset sampling condition, and the target flow meter is an electronic flow meter programmed to meet the preset flow measurement condition and the second preset sampling condition; Installing a target nozzle manifold and installing each target nozzle on the target nozzle manifold; the target nozzle manifold meets a preset pressure condition, and the target nozzle manifold can be installed with target nozzles of different sizes; The target nozzle manifold is pressure tested and drained.

4. The method for determining target parameters of a tight reservoir according to claim 1, wherein: The determining the target parameter corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data includes: determining target stages of the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data, and performing flow pattern analysis on each target stage to determine flow pattern analysis results corresponding to each target stage; Determining target parameters corresponding to the target reservoir based on each of the flow state analysis results; Among them, the target stages include the wellbore storage stage, the unstable linear flow stage in the fracture, the boundary control flow stage in the fracture, the fracture closure stage, the unstable linear flow stage in the fluid immersion zone, the boundary control flow stage in the fluid immersion zone, and the unstable linear flow stage of formation fluid into the fracture; the flow state analysis results include the time interval and bottom hole pressure data corresponding to the target stage.

5. The method for determining target parameters of a tight reservoir according to claim 4, wherein: Determining target parameters corresponding to the target reservoir based on each of the flow state analysis results includes: determining a target curve graph based on a first time interval corresponding to the fracture closure stage and corresponding first target bottom hole pressure data; The target crack closure point is determined based on the target curve graph using a G-function analysis method to determine the crack closure time and minimum horizontal principal stress corresponding to the target crack closure point.

6. The method for determining target parameters of a tight reservoir according to claim 4, wherein: Determining target parameters corresponding to the target reservoir based on each of the flow state analysis results includes: The target unstable pressure analysis method is used to determine the original formation pressure based on a second time interval corresponding to the unstable linear flow stage of the formation fluid into the fracture and corresponding second target bottom hole pressure data.

7. The method for determining target parameters of a tight reservoir according to claim 6, wherein: Also includes: A target productivity index determination method is used to determine a target productivity index corresponding to the target wellhead based on the original formation pressure.

8. A device for determining target parameters of a tight reservoir, characterized in that: include: a wellbore storage coefficient determination module, configured to inject a target liquid into a target reservoir, measure a target liquid injection volume and first wellhead pressure data of the target reservoir before fracturing using a target flow meter and a target pressure gauge pre-installed at a target wellhead, and determine a wellbore storage coefficient based on the target liquid injection volume and the first wellhead pressure data; the target reservoir is a tight reservoir at the bottom of the hole corresponding to the target wellhead; a friction coefficient determination module, configured to close the target wellhead based on a first shut-in time, determine first bottom hole pressure data corresponding to the target wellhead based on second wellhead pressure data measured by the target pressure gauge during the first shut-in time, and determine a target friction coefficient based on the wellbore storage coefficient and the first bottom hole pressure data; the target friction coefficient includes a perforation friction coefficient and a fracture bending friction coefficient corresponding to the target wellhead; a target data acquisition module, configured to open the target wellhead for liquid flowback based on a preset well opening time, close the target wellhead based on a second well closing time, and acquire third wellhead pressure data and liquid flow rate data corresponding to the target wellhead during the preset well opening time and fourth wellhead pressure data corresponding to the target wellhead during the second well closing time; a target parameter determination module, configured to determine second bottom hole pressure data based on the target friction coefficient, the third wellhead pressure data, and the liquid flow rate data, and to determine third bottom hole pressure data corresponding to the target wellhead based on the fourth wellhead pressure data, so as to determine a target parameter corresponding to the target reservoir based on the first bottom hole pressure data, the second bottom hole pressure data, and the third bottom hole pressure data; The target parameters include minimum horizontal principal stress and original formation pressure.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor is used to execute the computer program to implement the target parameter determination method for a tight reservoir according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that Used to store a computer program, wherein when the computer program is executed by a processor, the method for determining target parameters of a tight reservoir according to any one of claims 1 to 7 is implemented.

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