Oil-water two-phase horizontal well acoustic response physical simulation system and method

Abstract

The invention provides an oil-water two-phase horizontal well sound wave response physical simulation system and method, and relates to the technical field of oil and gas exploitation, and the system comprises a distributed optical fiber sound wave sensing unit which comprises a laser transmitter; the simulation tubular column comprises a tubular column body and an optical fiber arranged in the tubular column body, and a plurality of vertical holes are formed in the side wall of the tubular column body; the optical fiber is connected with the laser transmitter; the liquid supply unit comprises a liquid storage tank, a liquid supply pipeline and a constant-speed constant-pressure pump, the liquid storage tank is connected with the multiple vertical holes and the liquid inlet end of the tubular column body through the liquid supply pipeline, and the constant-speed constant-pressure pump is arranged on the liquid supply pipeline; one end of the oil-water separation unit is communicated with the liquid outlet end of the tubular column body, and the other end is communicated with an inlet of the liquid supply unit; and the camera shooting unit is arranged on one side of the simulation tubular column. According to the oil-water two-phase horizontal well acoustic response physical simulation method, the system is adopted, and a reference basis is provided for on-site underground monitoring by simulating the corresponding conditions and rules of the DAS in different oil-water two-phase states.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploitation, and in particular to a physical simulation system and method for acoustic wave response of an oil-water two-phase horizontal well. Background Art

[0002] Two-phase fluid flow is widely used in many industries such as petroleum industry and chemical engineering. The wide range of fields it covers and the importance of characteristic research have greatly promoted the development of multiphase fluid science and technology. In the oil field production process, especially in the middle and late stages with high water content and low liquid production, oil-water two-phase flow is one of the very typical multiphase flows. Horizontal wells have a good production increase effect and are suitable for low permeability, low pressure, heavy oil and other types of oil layers. They provide good conditions for achieving high production of thin oil and reducing mining costs. Compared with vertical wells, the flow parameters of oil-water two-phase fluids in horizontal wells are quite different, and the flow conditions are more complicated.

[0003] During the development and production of oil fields, if the oil layer is partially flooded, the water content of the entire oil layer will increase rapidly, causing the entire system to stop or paralyze. The huge losses caused by this will directly threaten the normal production of the oil wells, and even cause safety accidents, bringing great losses to enterprises and people's property.

[0004] In horizontal well production, the flow pattern, flow rate, flow velocity and phase content of oil-water two-phase flow are the main indicators for evaluating oil-water two-phase flow. Accurately measuring various indicators of oil-water two-phase flow in production is of great significance for understanding and mastering the production capacity, cross-channel and water flooding of each production layer of oil wells, analyzing the oil and water content of each underground reservoir, and then obtaining various information reflecting the oil layer conditions such as the dynamic characteristics of oil wells and oil reservoirs, and making comprehensive descriptions and predictions of reservoirs.

[0005] Therefore, a physical simulation system and method for the acoustic response of oil-water two-phase horizontal wells is urgently needed. By analyzing the distributed acoustic sensing (DAS) monitoring rules of the oil-water two-phase flow in the horizontal wellbore under different flow states through the oil-water two-phase acoustic response, a quantitative relationship between the DAS response in different flow states and the two-phase flow rate of the wellbore can be established, providing support for the quantitative interpretation and analysis of the horizontal well output profile. Summary of the invention

[0006] The purpose of the present invention is to provide a physical simulation system and method for acoustic wave response of oil-water two-phase horizontal wells, which can accurately obtain the response law of DAS under different oil-water ratios and different flow patterns of oil-water two-phase flow, and provide a reference basis for on-site downhole monitoring. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a physical simulation system for acoustic wave response of an oil-water two-phase horizontal well, comprising:

[0009] A distributed fiber optic acoustic wave sensing unit including a laser transmitter;

[0010] The simulated column includes a column body and an optical fiber disposed in the column body, a flow channel is disposed in the column body, and a plurality of vertical holes are disposed on the side wall of the column body, which are connected to the inside and outside of the column body and are perpendicular to the flow direction of the liquid in the flow channel; the optical fiber is connected to the laser emitter;

[0011] A liquid supply unit, comprising a liquid storage tank, a liquid supply pipeline and a constant speed and constant pressure pump, wherein the liquid storage tank comprises a water storage tank and an oil storage tank, the outlet of the liquid storage tank is respectively connected to the plurality of vertical holes and the liquid inlet end of the column body through the liquid supply pipeline, and the constant speed and constant pressure pump is arranged on the liquid supply pipeline;

[0012] An oil-water separation unit, one end of which is connected to the liquid outlet end of the column body through a liquid outlet pipeline, and the other end of which is connected to the inlet of the liquid supply unit through a connecting pipeline;

[0013] The camera unit is arranged on one side of the simulated pipe column.

[0014] Preferably, the optical fiber is in a "U" shape, comprising a first section, a turn section and a second section arranged in sequence, wherein:

[0015] The first section enters the column body along the liquid outlet end of the column body, and one end of the first section is connected to the laser emitter;

[0016] One end of the rotating section is connected to the other end of the first section, and the rotating section extends out of the tubular column body at the liquid inlet end of the tubular column body;

[0017] The second section is connected to the other end of the rotating section, and the second section enters the tubular column body along the liquid inlet end of the tubular column body and extends out of the tubular column body from the liquid outlet end of the tubular column body.

[0018] Preferably, the oil-water separation unit comprises a recovery tank and an oil-water separation assembly, wherein:

[0019] The inlet of the recovery tank is connected to the liquid outlet end of the column body through the liquid outlet pipeline; the outlet of the recovery tank is connected to the inlet of the oil-water separation component;

[0020] The outlet of the oil-water separation component is communicated with the inlet of the liquid supply unit through the connecting pipeline.

[0021] Preferably, a heating device is further included, and the heating device is used to heat the liquid storage tank.

[0022] Preferably, valves are provided on both the liquid supply pipeline and the liquid outlet pipeline.

[0023] Preferably, the optical fiber is an armored high-precision single-mode optical fiber.

[0024] Preferably, the spacing between adjacent vertical holes is greater than the minimum spatial resolution of the optical fiber.

[0025] Preferably, the outer side of the simulation column is a transparent glass tube.

[0026] A physical simulation method for acoustic wave response of an oil-water two-phase horizontal well, using the above-mentioned physical simulation system for acoustic wave response of an oil-water two-phase horizontal well, comprises the following steps:

[0027] S1: Simulation system preparation, including connecting the pipelines in the simulation system and adding oil and water to the oil storage tank and water storage tank of the liquid supply system respectively;

[0028] S2: respectively setting the initial flow rates of the constant speed and constant pressure pumps connected to the oil storage tank and the water storage tank to ensure that the liquid holdup of the oil and water injection flow rates of the simulated pipe string and the vertical hole section for simulating cluster perforation are consistent, and recording the acoustic signal response data and the liquid holdup through a distributed optical fiber acoustic sensor unit;

[0029] S3: changing the flow rate of the constant speed and constant pressure pump to ensure that the liquid holdup of the oil and water injection flow rates of the simulated pipe string and the vertical hole section used to simulate cluster perforation are consistent, and recording the acoustic signal response data and the liquid holdup through a distributed optical fiber acoustic sensor unit;

[0030] S4: repeat step S3 to obtain the acoustic wave signal response data of different flow rates under the first set of liquid holdup schemes;

[0031] S5: changing the liquid holdup scheme, repeating steps S1-S4, and obtaining multiple groups of acoustic wave signal response data at different flow rates under the liquid holdup schemes;

[0032] S6: According to the acoustic wave signal response data obtained in step S5, a relationship model between acoustic wave energy and flow rate under different liquid holdup conditions is established.

[0033] Preferably, the scheme for changing the liquid holdup includes changing the perforation density, perforation phase and cluster length of the perforation cluster.

[0034] The present invention provides a physical simulation system for acoustic wave response of an oil-water two-phase horizontal well, comprising a distributed optical fiber acoustic wave sensor unit, a simulated tubing, a liquid supply unit, an oil-water separation unit and a camera unit. The simulated tubing comprises a tubing body and an optical fiber arranged in the tubing body. A flow channel is arranged in the tubing body. A plurality of vertical holes connecting the inside and outside of the tubing body and perpendicular to the flow direction of the liquid in the flow channel are arranged on the side wall of the tubing body. The vertical holes are used to simulate a cluster perforation scheme, and the cluster perforation parameters can be dynamically adjusted according to experimental requirements. The optical fiber is connected to the laser transmitter, and the liquid supply unit includes a liquid storage tank, a liquid supply pipeline and a constant speed and constant pressure pump. The liquid storage tank is connected to the simulation string and the oil-water separation unit through the liquid supply pipeline and the liquid outlet pipeline respectively, so that the working fluid can be recycled. Through the coordination of the distributed optical fiber acoustic wave sensing unit, the simulation string, the liquid supply unit, the oil-water separation unit and the camera unit, by simulating the corresponding conditions and laws of DAS under different oil-water two-phase states, a regression model of the relationship between the acoustic wave response and the flow rate of two-phase flow horizontal wells under different completion methods and liquid holdup is established, which provides new technical ideas and methods for solving the problem of quantitative interpretation of the output profile of oil-water two-phase flow horizontal wells based on DAS monitoring.

[0035] The invention provides a physical simulation method for acoustic wave response of an oil-water two-phase horizontal well. The method ensures that the liquid holdups of the oil and water injection flows of a simulated pipe string and a vertical hole section for simulating cluster perforation are consistent by setting an initial flow rate of a constant speed and constant pressure pump connected to an oil storage tank and a water storage tank, records acoustic wave signal response data and liquid holdup by a distributed optical fiber acoustic wave sensing unit, and then changes the flow rate of the constant speed and constant pressure pump to ensure that the liquid holdups of the oil and water injection flows of the simulated pipe string and the vertical hole section for simulating cluster perforation are consistent, records acoustic wave signal response data and liquid holdup by a distributed optical fiber acoustic wave sensing unit, obtains acoustic wave signal response data of different flow rates under a first group of liquid holdup schemes, obtains acoustic wave signal response data of different flow rates under multiple groups of liquid holdup schemes by changing the liquid holdup schemes, establishes a relationship model between acoustic wave energy and flow rates under different liquid holdups by using the obtained acoustic wave signal response data, accurately obtains the response law of DAS under different oil-water ratios and different flow types of oil-water two-phase flow, and provides a reference basis for on-site downhole monitoring. 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of an embodiment of a physical simulation system for acoustic wave response of an oil-water two-phase horizontal well of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the simulation string in the physical simulation system of the oil-water two-phase horizontal well acoustic wave response of the present invention;

[0039] Figure 3 yes Figure 2 A right view structural diagram of ;

[0040] Figure 4 It is a comprehensive diagram of the acoustic wave profile diagnosis of the liquid production by the physical simulation method of the acoustic wave response of the oil-water two-phase horizontal well of the present invention.

[0041] In the figure: 1. Distributed fiber optic acoustic wave sensor unit; 11. Laser transmitter; 12. DAS signal receiving terminal;

[0042] 2. Simulated pipe column; 20. Pipe column body; 201. Liquid outlet; 202. Liquid inlet; 21. Optical fiber; 211. First section; 212. Rotating section; 213. Second section; 22. Flow channel; 23. Vertical hole;

[0043] 3. Liquid supply unit; 311. Water storage tank; 312. Oil storage tank; 32. Liquid supply pipeline; 33. Constant speed and constant pressure pump;

[0044] 4. Oil-water separation unit; 401. liquid outlet pipeline; 402. connecting pipeline; 41. recovery tank; 42. oil-water separation assembly;

[0045] 5. Camera unit. DETAILED DESCRIPTION

[0046] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0047] In the description of the present invention, it is to be understood that the terms “center”, “lateral”, “length”, “width”, “height”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “side”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0049] Figure 1 Schematic diagram of the structure of this embodiment. Figure 1 As shown, this embodiment provides a physical simulation system for acoustic wave response of oil-water two-phase horizontal wells, including a distributed optical fiber acoustic wave sensor unit 1, a simulation string 2, a liquid supply unit 3, an oil-water separation unit 4 and a camera unit 5.

[0050] The distributed optical fiber acoustic sensor unit (DAS) includes a laser transmitter 11 and a DAS signal receiving terminal 12, and the laser transmitter 11 and the DAS signal receiving terminal 12 are communicatively connected.

[0051] like Figure 1-Figure 3 As shown, the simulated column 2 includes a column body 20 and an optical fiber 21 disposed in the column body 20. A flow channel 22 is disposed in the column body 20. A plurality of vertical holes 23 are disposed on the side wall of the column body 20, which are connected to the inside and outside of the column body 20 and are perpendicular to the flow direction of the liquid in the flow channel 22. The vertical holes 23 are used to simulate the cluster perforation scheme, and the cluster perforation parameters can be dynamically adjusted according to the experimental requirements. The optical fiber 21 is connected to the laser transmitter 11.

[0052] In this embodiment, the optical fiber 21 is "U"-shaped, and includes a first section 211, a turn section 212, and a second section 213, which are sequentially arranged. The first section 211 enters the column body 20 along the liquid outlet 201 of the column body 20, and one end of the first section 211 is connected to the laser emitter 11; one end of the turn section 212 is connected to the other end of the first section 211, and the turn section 212 extends out of the column body 20 at the liquid inlet 202 of the column body 20; the second section 213 is connected to the other end of the turn section 212, and the second section 213 enters the column body 20 along the liquid inlet 202 of the column body 20, and extends out of the column body 20 from the liquid outlet 201 of the column body 20.

[0053] Optionally, the optical fiber 21 is an armored high-precision single-mode optical fiber. In a single-head installation manner, after the armored optical fiber enters the interior of the simulated tubular column 2 from the liquid outlet end 201 of the simulated tubular column 2 and extends out from the liquid inlet end 202 of the simulated tubular column 2, the optical fiber 21 turns back and enters the simulated tubular column 2 from the liquid inlet end 202 of the simulated tubular column 2 and then extends out from the liquid outlet end 201 of the simulated tubular column 2 for a certain length.

[0054] Optionally, when the armored optical fiber in this embodiment is placed on the outer wall of the simulated pipe column 2, an optical fiber built-in fixing ring is used. The fixing ring is provided with two slots for fixing the armored optical fiber at the upper and lower positions, and the optical fiber is fixed with a nut and a rubber ring. It is used for fixing and protecting the armored optical fiber, and is light in weight and easy to install.

[0055] Specifically, the simulated pipe string 2 in this embodiment is made of high-pressure resistant glass with a certain strength, and is used to simulate the cluster perforation scheme by evenly setting vertical holes 23 of equal size on the outer surface of the simulated pipe string 2. Specifically, the vertical holes 23 are used to simulate the eyelets, and the spacing between the eyelet sizes on the simulated pipe string is greater than the minimum spatial resolution of the armored optical fiber. The eyelets are provided with matching eyelet tubes and external hexagonal oil plugs for connecting the infusion pipeline and closing the eyelets.

[0056] Optionally, the outer side of the simulation column 2 is a transparent glass tube, so that the simulation column 2 can be protected and the simulation column 2 can be observed in real time.

[0057] like Figure 1 As shown, the liquid supply unit 3 in this embodiment includes a liquid storage tank, a liquid supply pipeline 32 and a constant speed and pressure pump 33. Among them, the liquid storage tank includes a water storage tank 311 and an oil storage tank 312, and the outlet of the liquid storage tank is respectively connected to a plurality of vertical holes 23 and a liquid inlet end 202 of the column body 20 through the liquid supply pipeline 32, and a constant speed and pressure pump 33 is arranged on the liquid supply pipeline 32. In this embodiment, the working fluid used in the simulation experiment is oil containing oil-soluble pigment and clean water.

[0058] It can be understood that each group of liquid supply pipelines 32 in this embodiment is composed of a plurality of liquid supply pipes connected together, the structure of each group of liquid supply pipelines 32 is the same, and each group of liquid supply pipelines 32 can be connected to one or more vertical holes 23.

[0059] Optionally, the liquid storage tank in this embodiment is a square tank made of glass. A heating device is also included, and the heating device is used to heat the liquid storage tank. Preferably, the liquid storage tank in this embodiment has a heating function. Of course, in actual use, an additional heating device can also be provided to meet the temperature requirements of the liquid storage tank.

[0060] like Figure 1 As shown, the oil-water separation unit 4 in this embodiment has one end connected to the liquid outlet end 201 of the column body 20 through a liquid outlet pipeline 401 , and the other end connected to the inlet of the liquid supply unit 3 through a connecting pipeline 402 .

[0061] Specifically, the oil-water separation unit 4 includes a recovery tank 41 and an oil-water separation component 42, wherein the inlet of the recovery tank 41 is connected to the liquid outlet end 201 of the column body 20 through a liquid outlet pipeline 401; the outlet of the recovery tank 41 is connected to the inlet of the oil-water separation component 42; the outlet of the oil-water separation component 42 is connected to the inlet of the liquid supply unit 3 through a connecting pipeline 402.

[0062] In this embodiment, valves are provided on the liquid supply pipeline 32 and the liquid outlet pipeline 401 to control the liquid supply and liquid outlet. It is understandable that valves are also provided on other pipelines in this embodiment to facilitate the smooth conduct of the simulation experiment. By providing a liquid storage tank to connect the simulation column 2 and the oil-water separation unit 4 through the liquid supply pipeline 32 and the liquid outlet pipeline 401, the working fluid can be recycled.

[0063] The camera unit 5 is arranged on one side of the simulated pipe string 2. In this embodiment, the camera unit 5 includes a high-speed camera. When in use, the high-speed camera is set at a horizontal position with the simulated pipe string 2 and located at the center of the length direction of the simulated pipe string 2 to facilitate recording of the simulated pipe string 2.

[0064] Figure 4 FIG. 1 is a flow chart of the physical simulation method for acoustic wave response of oil-water two-phase horizontal wells of the present invention. Figure 4 As shown, this embodiment provides a physical simulation method for acoustic wave response of oil-water two-phase horizontal wells, using the above-mentioned physical simulation system for acoustic wave response of oil-water two-phase horizontal wells. This embodiment takes four-cluster perforation of a horizontal well as an example, and specifically includes the following steps:

[0065] S1: Simulation system preparation, including connecting the pipelines in the simulation system and adding oil and water to the oil storage tank and water storage tank of the liquid supply system respectively; specifically including:

[0066] S11, installing the simulation column 2;

[0067] S12, close the oil-water separation unit 4, and connect the pipelines in the simulation system according to the simulation scheme;

[0068] S13, adding oil into the oil storage tank 312 of the liquid supply unit 3, the oil containing only oil-soluble pigment; adding water into the water storage tank 311 of the liquid supply unit 3;

[0069] S14, placing the outlet end of the oil outlet pipeline of the oil storage tank 312 and the inlet end of the oil inlet pipeline below the working fluid level; placing the outlet end of the water outlet pipeline of the water storage tank 311 below the working fluid level;

[0070] S2: The initial flow rates of the constant speed and constant pressure pumps 33 connected to the oil storage tank 312 and the water storage tank 311 are respectively set to ensure that the liquid holdup of the oil and water injection flow rates of the simulated tubing string 2 and the vertical hole 23 for simulating cluster perforation are consistent, and the acoustic signal response data and liquid holdup are recorded by the distributed optical fiber acoustic sensor unit.

[0071] In this embodiment, the specific steps include: S21, starting the heating of the liquid storage tank, setting the heating temperature of the liquid storage tank to T 0, open the outlet valve, turn on all constant speed and pressure pumps, observe the thermometer to ensure that the initial temperature of the working fluid injected into each cluster perforation section is consistent, and set the constant speed and pressure pump A connected to the oil storage tank 312 1 and A 3 The initial flow rates are Q 11 and Q 31 , set the constant speed constant pressure pump A connected to the water storage tank 311 2 and A 4 The initial flow rates are Q 21 and Q 41 , observe the flowmeter to ensure that the liquid holdup of the oil and water injection flow rates of the simulated tubing string 2 and each cluster perforation section is consistent.

[0072] S22: After the readings of the thermometer and flowmeter are stable, turn on the DAS system, the laser light source, and the high-speed camera, and observe the acoustic wave data measured by the signal receiver. After the acoustic wave data is stable, record the acoustic wave response data W. 111 , W 121 , W 131 , W 141 and liquid holdup rate.

[0073] In actual operation, the specific operation method is as follows:

[0074] Use constant speed constant pressure pump A 1 Fill the simulated column 2 with oil containing only the pigment soluble in oil, and determine the injection flow rate as Q 11 , turn on the laser transmitter and DAS system, and record the acoustic signal response data W of the distributed optical acoustic sensor system (DAS) 111 ;

[0075] Open the oil-water separation unit 4 to discharge the oil in the simulated column 2 that contains only the oil-soluble pigment, close the oil-water separation unit 4, and use the constant speed and constant pressure pump A 2 Fill the simulated column 2 with water and determine the input flow rate as Q 21 , record the acoustic signal response data W of the distributed optical fiber acoustic sensor system (DAS) 121 ;

[0076] Open the oil-water separation unit 4, drain the water in the simulated column 2, close the oil-water separation unit 4, and use the constant speed and constant pressure pump A 3 Fill the simulated column 2 with oil containing only the pigment soluble in oil, and determine the input flow rate as Q 31 , recording the acoustic data of the distributed optical acoustic sensing system (DAS) 131 ;

[0077] Open the oil-water separation unit 4 to discharge the oil in the simulated column 2 that contains only the oil-soluble pigment, close the oil-water separation unit 4, and use the constant speed and constant pressure pump A 4Fill the simulated column 2 with water and determine the input flow rate as Q 41 , recording the acoustic data of the distributed optical acoustic sensing system (DAS) 141 .

[0078] S3: changing the flow rate of the constant speed and constant pressure pump to ensure that the liquid holdup of the oil and water injection flow rates of the simulated pipe string and the vertical hole section used to simulate cluster perforation are consistent, and recording the acoustic signal response data and the liquid holdup through a distributed optical fiber acoustic sensor unit.

[0079] This embodiment specifically includes:

[0080] S31: Increase the flow rate of the constant speed and constant pressure pump to Q 12 , Q 22 , Q 32 , Q 42 , observe the flowmeter to ensure that the injection flow rate of oil and water in each cluster perforation section is consistent with the liquid holdup rate, and the heating temperature of the liquid storage tank is still T 0 Keep it constant and observe the thermometer to ensure that the initial temperature of the working fluid injected into each cluster perforation section is consistent;

[0081] S32: After the readings of the thermometer and flowmeter and the acoustic wave data displayed by the signal receiver are stable, record the acoustic wave response data W of the four perforation clusters at the oil-water ratio. 112 , W 122 , W 132 , W 142 and liquid holdup rate.

[0082] S4: repeat step S3 to obtain the acoustic wave signal response data of different flow rates under the first set of liquid holdup schemes;

[0083] Specifically: Change the constant speed and constant pressure pump A of the oil storage tank respectively 1 and A 3 The flow rate of the flow is Q 1i and Q 3i , respectively change the constant speed and constant pressure pump A of the water storage tank 2 and A 4 The flow rate is Q 2i and Q 4i , other conditions remain unchanged, ensure the same liquid holdup in the entire pipeline, observe the liquid flow pattern in the simulated column, and record Q 1i , Q 2i , Q 3i , Q 4i The ratio of and liquid holdup, and the signal response data of the distributed optical acoustic sensor system (DAS) is recorded as W 11i , W 12i , W 13i , W 14i ;

[0084] The flow rate is Q 11 ~Q 1i , Q 21 ~Q 2i , Q 31 ~Q 3i and Q 41 ~Q 4i When the corresponding sound wave data W 111 ~W 11i , W 121 ~W 12i , W 131 ~W 13i , W 141 ~W 14i , so far, under the first group of liquid holdup scheme, constant speed and constant pressure pump A 1 , A 1 , A 3 , A 4 The acoustic wave data test of different flow rates in the indicated direction is completed

[0085] S5: changing the liquid holdup scheme, repeating steps S1-S4, and obtaining multiple groups of acoustic wave signal response data at different flow rates under the liquid holdup schemes;

[0086] In this embodiment, the specific steps include: turning off the constant speed and constant pressure pump 33, stopping heating the liquid storage tank, changing the liquid holdup scheme, and repeating steps S1 to S4 to complete the second set of liquid holdup schemes. 1 , A 1 , A 3 , A 4 The acoustic wave data test of different flow rates in the indicated direction measured Q 11 ~Q 1i , Q 21 ~Q 2i , Q 31 ~Q 3i and Q 41 ~Q 4i When the corresponding sound wave data W 211 ~W 21i , W 221 ~W 22i , W 231 ~W 23i , W 241 ~W 21i ;

[0087] The scheme for changing the liquid holdup in this embodiment includes changing the perforation density, perforation phase and cluster length of the perforation cluster.

[0088] Repeat the above steps to complete the constant speed and pressure pump A under the nth group of liquid holdup schemes. 1 , A 1 , A 3 , A4 The acoustic wave data test of different flow rates in the indicated direction is used to measure Q 11 ~Q 1i , Q 21 ~Q 2i , Q 31 ~Q 3i and Q 41 ~Q 4i When the corresponding sound wave data W n11 ~W n1i , W n21 ~W n2i , W n31 ~W n3i , W n41 ~W n1i .

[0089] S6: According to the acoustic wave signal response data obtained in step S5, a relationship model between acoustic wave energy and flow rate under different liquid holdup conditions is established.

[0090] like Figure 4 As shown, specifically, the acoustic wave data measured under different liquid holdups are analyzed, and for the nth completion method, the measured acoustic wave data Wn10~Wn1i, Wn20~Wn2i, Wn30~Wn3i+, Wn41~Wn1 i are processed by methods including but not limited to Fourier transform and short-time Fourier transform, and the spectrum data of DAS is extracted to determine the corresponding main frequency bands of the acoustic wave data (Hzn11~Hzn1 i, Hzn21~Hzn2i, Hzn31~Hzn3i Hzn41~Hzn4i), and the acoustic wave energy within the main frequency bands is calculated respectively (En11~En1 i, En21~En2i, En31~En3i, En41~En4i), and then the acoustic wave energy and production Q11~Q1 i are plotted respectively. i, Q21~Q2i, Q31~Q3i and Q41~Q4i corresponding curves, through regression, obtain the relationship model between the acoustic wave energy and flow rate corresponding to different flow rates in the directions represented by the constant speed and constant pressure pumps A1, A1, A3, and A4 under the nth liquid holdup;

[0091] Repeat the above steps to establish the relationship model between the acoustic wave energy and the flow rate corresponding to different flow rates under n kinds of liquid holdup (the following model is only an example, but the established relationship model is not limited to the following polynomial form):

[0092] Liquid holdup 1:

[0093]

[0094] Liquid hold-up 2:

[0095]

[0096] …

[0097] Liquid holdup rate n:

[0098]

[0099] On-site usage is as follows:

[0100] 1. According to the actual completion method, number of perforation clusters, and oil liquid holdup of the horizontal injection wells on site, a corresponding relationship model between acoustic wave energy and injection volume is selected;

[0101] 2. According to the measured acoustic wave data of the horizontal injection well on site, calculate the acoustic wave energy of the entire horizontal well section and determine the corresponding model;

[0102] 3. Input the sound wave energy value at each position into the selected relationship model to calculate the injection volume in the direction indicated by the constant speed and constant pressure pumps A1, A1, A3, and A4.

[0103] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A physical simulation system for acoustic wave response of oil-water two-phase horizontal wells, characterized in that: include: A distributed fiber optic acoustic wave sensing unit including a laser transmitter; The simulated column includes a column body and an optical fiber disposed in the column body, a flow channel is disposed in the column body, and a plurality of vertical holes are disposed on the side wall of the column body, which are connected to the inside and outside of the column body and are perpendicular to the flow direction of the liquid in the flow channel; the optical fiber is connected to the laser emitter; A liquid supply unit, comprising a liquid storage tank, a liquid supply pipeline and a constant speed and constant pressure pump, wherein the liquid storage tank comprises a water storage tank and an oil storage tank, the outlet of the liquid storage tank is respectively connected to the plurality of vertical holes and the liquid inlet end of the column body through the liquid supply pipeline, and the constant speed and constant pressure pump is arranged on the liquid supply pipeline; An oil-water separation unit, one end of which is connected to the liquid outlet end of the column body through a liquid outlet pipeline, and the other end of which is connected to the inlet of the liquid supply unit through a connecting pipeline; The camera unit is arranged on one side of the simulated pipe column.

2. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to claim 1 is characterized by: The optical fiber is in a "U" shape, and includes a first section, a turn section, and a second section arranged in sequence, wherein: The first section enters the column body along the liquid outlet end of the column body, and one end of the first section is connected to the laser emitter; One end of the rotating section is connected to the other end of the first section, and the rotating section extends out of the tubular column body at the liquid inlet end of the tubular column body; The second section is connected to the other end of the rotating section, and the second section enters the tubular column body along the liquid inlet end of the tubular column body and extends out of the tubular column body from the liquid outlet end of the tubular column body.

3. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to claim 1 is characterized by: The oil-water separation unit comprises a recovery tank and an oil-water separation assembly, wherein: The inlet of the recovery tank is connected to the liquid outlet end of the column body through the liquid outlet pipeline; the outlet of the recovery tank is connected to the inlet of the oil-water separation component; The outlet of the oil-water separation component is communicated with the inlet of the liquid supply unit through the connecting pipeline.

4. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 3, characterized in that: It also includes a heating device, which is used to heat the liquid storage tank.

5. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 3, characterized in that: Valves are arranged on the liquid supply pipeline and the liquid outlet pipeline.

6. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 3, characterized in that: The optical fiber is an armored high-precision single-mode optical fiber.

7. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 3, characterized in that: The spacing between adjacent vertical holes is greater than the minimum spatial resolution of the optical fiber.

8. The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 3, characterized in that: The outer side of the simulation column is a transparent glass tube.

9. A physical simulation method for acoustic wave response of oil-water two-phase horizontal well, characterized in that: The oil-water two-phase horizontal well acoustic wave response physical simulation system according to any one of claims 1 to 8 comprises the following steps: S1: Simulation system preparation, including connecting the pipelines in the simulation system and adding oil and water to the oil storage tank and water storage tank of the liquid supply system respectively; S2: respectively setting the initial flow rates of the constant speed and constant pressure pumps connected to the oil storage tank and the water storage tank to ensure that the liquid holdup of the oil and water injection flow rates of the simulated pipe string and the vertical hole section for simulating cluster perforation are consistent, and recording the acoustic signal response data and the liquid holdup through a distributed optical fiber acoustic sensor unit; S3: changing the flow rate of the constant speed and constant pressure pump to ensure that the liquid holdup of the oil and water injection flow rates of the simulated pipe string and the vertical hole section used to simulate cluster perforation are consistent, and recording the acoustic signal response data and the liquid holdup through a distributed optical fiber acoustic sensor unit; S4: repeat step S3 to obtain the acoustic wave signal response data of different flow rates under the first set of liquid holdup schemes; S5: changing the liquid holdup scheme, repeating steps S1-S4, and obtaining multiple groups of acoustic wave signal response data at different flow rates under the liquid holdup schemes; S6: According to the acoustic wave signal response data obtained in step S5, a relationship model between acoustic wave energy and flow rate under different liquid holdup conditions is established.

10. The physical simulation method for acoustic wave response of oil-water two-phase horizontal well according to claim 9, characterized in that: The liquid holdup replacement scheme includes changing the perforation density, perforation phase and cluster length of the perforation cluster.

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