Simulated wellbore test system

Abstract

The present application discloses a simulated wellbore experimental system, which belongs to the technical field of oil and gas production. The simulated wellbore experimental system includes a fixed wellbore and a replaceable experimental pipeline assembly located in the fixed wellbore. The experimental pipeline assembly includes an experimental casing, a simulated production oil pipe, a gas injection oil pipe, a guide shoe and a connector. Among them, the gas injection oil pipe is located outside the experimental casing and is connected to the experimental casing through a connector. The guide shoe has a mixing cavity, and the guide shoe is respectively connected to one end of the experimental casing and one end of the gas injection oil pipe, so that the experimental casing and the gas injection oil pipe are both connected to the mixing cavity. The simulated production oil pipe is located in the experimental casing, and the first end of the simulated production oil pipe is located in the mixing cavity of the guide shoe. The simulated wellbore experimental system provided by the present application can reduce the cost of simulated testing in oil and gas fields. The present application is used for simulation testing in oil and gas fields.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas extraction, and in particular to a simulated wellbore experimental system. Background Art

[0002] Before the oil and gas field is exploited, it is necessary to conduct simulation tests on the oil and gas field in advance, and use the simulation test results to guide the exploitation of the oil and gas field.

[0003] When conducting a simulation test, it is necessary to drill in a formation without oil and gas production to obtain a simulated wellbore to be tested, and then run a casing into the simulated wellbore to support the simulated wellbore. Afterwards, oil or natural gas can be injected into the casing, and an oil pipe can be run to simulate the oil or natural gas extraction process. Subsequently, the test of the simulated wellbore can be completed based on the extraction results.

[0004] At present, due to the different sizes of wellbores constructed in different oil and gas fields, it is necessary to build simulation wellbores of the same size as the wellbores of different sizes, which will increase the cost of simulation testing and further increase the cost of oil and gas field exploitation. Summary of the invention

[0005] The present application provides a simulated wellbore experiment system, which can reduce the cost of simulation testing in oil and gas fields. The technical solution is as follows:

[0006] The present application provides a simulated wellbore experiment system, comprising: a fixed wellbore, and a replaceable experimental pipe assembly located in the fixed wellbore;

[0007] The experimental pipeline assembly includes: an experimental casing, a simulated production oil pipe, a gas injection oil pipe, a guide shoe and a connector;

[0008] Wherein, the gas injection oil pipe is located outside the experimental casing and is connected to the experimental casing through the connecting piece;

[0009] The guide shoe has a mixing cavity, the guide shoe is respectively connected to one end of the experimental casing and one end of the gas injection oil pipe, and the experimental casing and the gas injection oil pipe are both connected to the mixing cavity;

[0010] The simulated production tubing is located in the experimental casing, and the first end of the simulated production tubing is located in the mixing chamber of the guide shoe.

[0011] Optionally, a protruding structure is provided on the side wall of the guide shoe, the protruding structure has a first through hole communicating with the mixing chamber, and one end of the gas injection oil pipe is connected to the protruding structure.

[0012] Optionally, one end of the experimental casing is threadedly connected to the guide shoe, and one end of the gas injection oil pipe is threadedly connected to the protruding structure.

[0013] Optionally, the guide shoe further has a second through hole communicated with the mixing chamber, and the second through hole is located on a side of the guide shoe away from the experimental casing.

[0014] Optionally, the connecting member includes: a first sub-connecting member connected to the outer wall of the experimental casing, and a second sub-connecting member connected to the outer wall of the gas injection oil pipe, and the first sub-connecting member is fixedly connected to the second sub-connecting member.

[0015] Optionally, the first sub-connector and the second sub-connector both include: two mutually connected hoop members, each hoop member being a semi-annular structure;

[0016] Wherein, a hoop member in the first sub-connector is fixedly connected to a hoop member in the second sub-connector.

[0017] Optionally, the first sub-connector and the second sub-connector each further include: two fasteners located at two ends of each of the clamping members, and the two clamping members are fastened and connected by the two fasteners.

[0018] Optionally, the fastener includes: a fastening bolt.

[0019] Optionally, the simulated wellbore experiment system further comprises: a hanger assembly located outside the fixed wellbore, the hanger assembly comprising a first pipe hanger, a second pipe hanger and a third pipe hanger;

[0020] Among them, the first pipe hanger is connected to the end of the experimental casing away from the guide shoe, the second pipe hanger is connected to the end of the gas injection oil pipe away from the guide shoe, and the third pipe hanger is connected to the end of the simulated production oil pipe away from the guide shoe.

[0021] Optionally, the simulated wellbore experimental system further includes: a fixed casing located in the fixed wellbore and connected to the inner wall of the fixed gas cylinder.

[0022] The beneficial effects of the technical solution provided by this application are:

[0023] The present application provides a simulated wellbore experimental system, which includes: a fixed wellbore and a replaceable experimental pipeline assembly located in the fixed wellbore. The experimental pipeline assembly includes an experimental casing, a simulated production oil pipe located in the experimental casing, a gas injection oil pipe located outside the experimental casing, a guide shoe with a mixing cavity, and a connector connecting the experimental casing and the gas injection oil pipe. One end of the experimental casing and one end of the gas injection oil pipe are both connected to the mixing cavity, and the first end of the simulated production oil pipe is located in the mixing cavity of the guide shoe. When it is necessary to perform a simulation test on the wellbore to be simulated, an experimental casing that matches the size of the wellbore to be simulated of different sizes can be selected, and the experimental casing is connected to the guide shoe that matches its size, and then connected to the gas injection oil pipe and lowered into the fixed wellbore, and then the simulated production oil pipe is lowered into the experimental casing to complete the construction of the simulated wellbore experimental system. In this way, wellbores of various sizes can be simulated and tested according to the simulated wellbore experimental system, without the need to construct simulated wellbores of the same size as the wellbores of different sizes to be simulated, thereby reducing the cost of simulation testing and the cost of oil and gas field exploitation. In addition, since the simulated wellbore experimental system also includes a gas injection oil pipe, the gas injection oil pipe is connected to the experimental casing through a guide shoe, so the gas injected by the gas injection oil pipe and the liquid injected into the annulus between the experimental casing and the simulated production oil pipe can be mixed in the mixing chamber of the guide shoe to simulate the working condition of the gas-liquid two-phase mixing at the bottom of the well, so that the simulated wellbore experimental system can more realistically reflect the actual working condition at the bottom of the well, and the results of the simulation test are more accurate.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of a simulated wellbore experimental system provided in an embodiment of the present application;

[0027] Figure 2 It is a structural schematic diagram of a guide shoe provided in an embodiment of the present application;

[0028] Figure 3 It is a structural schematic diagram of a connecting piece provided in an embodiment of the present application;

[0029] Figure 4 It is a structural schematic diagram of a suspension assembly provided in an embodiment of the present application.

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0032] Please refer to Figure 1 , Figure 1 It is a structural schematic diagram of a simulated wellbore experimental system provided in an embodiment of the present application. The simulated wellbore experimental system 000 includes: a fixed wellbore 100, and a replaceable experimental pipe assembly 200 located in the fixed wellbore.

[0033] The experimental pipeline assembly 200 includes: an experimental casing 201 , a simulated production oil pipe 202 , a gas injection oil pipe 203 , a guide shoe 204 and a connector 205 .

[0034] The gas injection oil pipe 203 is located outside the experimental casing 201 and is connected to the experimental casing 201 through a connector 205 , so that the pipe body of the gas injection oil pipe 203 is connected to the pipe body of the experimental casing 201 .

[0035] The guide shoe 204 has a mixing cavity K, and the guide shoe 204 is connected to one end of the experimental casing 201 and one end of the gas injection oil pipe 203, respectively, and the experimental casing 201 and the gas injection oil pipe 204 are both connected to the mixing cavity K. The guide shoe 204 can be used to guide the experimental casing 201 and the gas injection oil pipe 203 to smoothly go down to the bottom of the fixed wellbore 100 to prevent one end of the experimental casing 201 and / or one end of the gas injection oil pipe 203 from scraping or inserting into the well wall of the fixed wellbore 100. In addition, the guide shoe 204 is also used to connect the experimental casing 201 and the gas injection oil pipe 203, so that the liquid injected into the experimental casing 201 and the gas injected into the gas injection oil pipe 203 are mixed in the mixing cavity K of the guide shoe 204.

[0036] The simulated production tubing 202 is located in the experimental casing 201 , and a first end of the simulated production tubing 202 is located in the mixing cavity K of the guide shoe 204 .

[0037] In an embodiment of the present application, when it is necessary to conduct a simulation test on the wellbore to be simulated, an experimental casing 201 of the same size as the wellbore to be simulated can be selected according to the size of the wellbore to be simulated, and the experimental casing 201 is connected to a guide shoe 204 of a size matching the wellbore, and then connected to the gas injection oil pipe 203 and lowered into the fixed wellbore 100, and then the simulated production oil pipe 202 is lowered into the experimental casing 201 to complete the construction of the simulated wellbore experimental system.

[0038] The experimental casing 201 is used to simulate the casing in the wellbore to be simulated, and the simulated production oil pipe 202 is used to simulate the oil pipe used in the actual production of the wellbore to be simulated. When conducting a simulation test of natural gas or crude oil production, the simulated environmental parameters (such as temperature and pressure, etc.) that are the same as the environmental parameters of the wellbore to be simulated are pre-set, and then a preset displacement of natural gas is injected into the gas injection oil pipe 203 (or a preset displacement of crude oil is injected into the annulus between the experimental casing 201 and the simulated production oil pipe 202), and it is produced from the simulated production oil pipe 202 to conduct a simulation test, and according to the results of the simulation test, the actual natural gas production of the wellbore to be simulated is guided. Since the gas injection oil pipe 203 is connected to the experimental casing 201 through the guide shoe 204, the liquid (such as crude oil) injected into the annulus between the experimental casing 201 and the simulated production oil pipe 202 can be mixed with the gas (such as natural gas) injected into the gas injection oil pipe 203 in the mixing chamber K of the guide shoe 204 to simulate the working condition of gas-liquid two-phase mixing at the bottom of the well, so that the simulated wellbore experimental system can more realistically reflect the actual working conditions at the bottom of the well.

[0039] In summary, the present application provides a simulated wellbore experimental system, which includes a fixed wellbore and a replaceable experimental pipeline assembly located in the fixed wellbore. The experimental pipeline assembly includes an experimental casing, a simulated production oil pipe located in the experimental casing, a gas injection oil pipe located outside the experimental casing, a guide shoe with a mixing cavity, and a connector connecting the experimental casing and the gas injection oil pipe. One end of the experimental casing and one end of the gas injection oil pipe are both connected to the mixing cavity, and the first end of the simulated production oil pipe is located in the mixing cavity of the guide shoe. When it is necessary to perform a simulation test on the wellbore to be simulated, an experimental casing that matches the size of the wellbore to be simulated of different sizes can be selected, and the experimental casing is connected to the guide shoe that matches its size, and after being connected to the gas injection oil pipe, it is lowered into the fixed wellbore, and then the simulated production oil pipe is lowered into the experimental casing to complete the construction of the simulated wellbore experimental system. In this way, wellbores of various sizes can be simulated and tested according to the simulated wellbore experimental system, without the need to construct simulated wellbores of the same size as the wellbores of different sizes to be simulated, thereby reducing the cost of simulation testing and the cost of oil and gas field exploitation. In addition, since the simulated wellbore experimental system also includes a gas injection oil pipe, the gas injection oil pipe is connected to the experimental casing through a guide shoe, so the gas injected by the gas injection oil pipe and the liquid injected into the annulus between the experimental casing and the simulated production oil pipe can be mixed in the mixing chamber of the guide shoe to simulate the working condition of the gas-liquid two-phase mixing at the bottom of the well, so that the simulated wellbore experimental system can more realistically reflect the actual working condition at the bottom of the well, and the results of the simulation test are more accurate.

[0040] Optionally, refer to Figure 1 The simulated wellbore experimental system 000 further includes: a fixed casing 300 located in the fixed wellbore 100 and connected to the inner wall of the fixed gas cylinder. The fixed casing 300 is used to support the fixed wellbore 100.

[0041] Optionally, refer to Figure 2 , Figure 2 2 is a schematic diagram of the structure of a guide shoe provided in an embodiment of the present application. The guide shoe 204 has a protruding structure 2041 on its side wall. The protruding structure 2041 has a first through hole M1 connected to the mixing chamber K. One end of the gas injection oil pipe 203 is connected to the protruding structure 2041. In the present application, one end of the experimental casing 201 is threadedly connected to the guide shoe 204, and one end of the gas injection oil pipe 203 is threadedly connected to the protruding structure 2041.

[0042] In the embodiment of the present application, since the size of the experimental casing 201 can be changed according to different wellbores to be simulated, the size of the guide shoe 204 threadedly connected to the experimental casing 201 can also be changed accordingly. That is, the size of the experimental casing 201 and the size of the guide shoe 204 in the simulated wellbore experimental system 000 can be selected according to the size of the wellbore to be simulated, so as to ensure that the size of the experimental casing 201 matches the size of the casing of the wellbore to be simulated.

[0043] Optionally, the guide shoe 204 also has a second through hole M2 connected to the mixing cavity K, and the second through hole M2 is located on the side of the guide shoe 204 away from the experimental casing 201. The guide shoe 204 is connected to the fixed wellbore 100 through the second through hole M2. Since the internal space of the mixing cavity K of the guide shoe 204 is fixed, in order to better simulate the working condition of the gas-liquid two-phase flow at the bottom of the well, a second through hole M2 can be set on the side of the guide shoe 204 away from the experimental casing 201, so that the liquid and gas injected into the mixing cavity K flow to the bottom of the fixed wellbore 100, so that the liquid and gas can be fully mixed, thereby simulating the working condition of the gas-liquid two-phase flow at the bottom of the well, so that the simulated wellbore experimental system can more realistically reflect the working condition of the actual bottom of the well.

[0044] It is worth noting that, since the depth of the wellbore used for exploitation in the oil and gas field is usually deep, and the wellbore may be a wellbore with a variable diameter structure (that is, the diameters of different sections of the wellbore are different), when the casing supporting the wellbore is lowered, the casing is lowered in sections, and multiple casings of shorter lengths and the same or different diameters are connected in sequence and lowered into the wellbore. For this reason, the present application also uses the same method to lower the experimental casing 201.

[0045] For example, there can be multiple experimental casings 201, and the diameters of the multiple experimental casings 201 can be set according to the diameter of the casing of the wellbore to be simulated, so that the experimental casing 201 can simulate the structure of the casing of the wellbore to be simulated. In this way, the experimental casing 201 provided by the present application can simulate wellbores of different diameters to be simulated, and has a wide range of applications, which reduces the cost of conducting wellbore simulation tests in oil and gas fields. It should be noted that the diameters of the multiple experimental casings 201 located in the fixed wellbore 100 can be the same or different, and the embodiments of the present application do not limit this.

[0046] Optionally, any two adjacent experimental sleeves 201 may be fixedly connected by threads or welding, and the plurality of experimental sleeves 201 are interconnected.

[0047] In the embodiment of the present application, there are multiple simulated production oil pipes 202 and gas injection oil pipes 203 in the fixed wellbore 100. The diameters of the multiple simulated production oil pipes 202 in the fixed wellbore 100 can be the same, and any two adjacent simulated production oil pipes 202 can be fixedly connected by threading or welding, and the multiple simulated production oil pipes 202 are interconnected; the diameters of the multiple gas injection oil pipes 203 can be the same, and any two adjacent gas injection oil pipes 203 can be fixedly connected by threading or welding, and the multiple gas injection oil pipes 203 are interconnected.

[0048] Optionally, refer to Figure 3 , Figure 3 2 is a schematic diagram of the structure of a connector provided in an embodiment of the present application, wherein the connector 205 includes a first sub-connector 2051 connected to the outer wall of the experimental casing 201, and a second sub-connector 2052 connected to the outer wall of the gas injection oil pipe 203, wherein the first sub-connector 2051 is fixedly connected to the second sub-connector 2052. Since one end of the experimental casing 201 is connected to one end of the gas injection oil pipe 203 through a guide shoe 204, and the experimental casing 201 and the gas injection oil pipe 203 are relatively long, in order to more conveniently lower the experimental casing 201 and the gas injection oil pipe 203 into the fixed wellbore 100 together, the gas injection oil pipe 203 can be fixed to one side of the experimental casing 201.

[0049] In the examples of this application, please refer to Figure 3 The first sub-connector 2051 and the second sub-connector 2052 each include two mutually connected hoop members, wherein each hoop member is a semi-annular structure. One hoop member in the first sub-connector 2051 is fixedly connected to one hoop member in the second sub-connector 2052.

[0050] For example, the two clamping members in the first sub-connector 2051 are respectively: the first clamping member 2051a and the second clamping member 2051b; the two clamping members in the second sub-connector 2052 are respectively: the third clamping member 2052a and the fourth clamping member 2052b. The second clamping member 2051b in the first sub-connector 2051 can be fixedly connected to the third clamping member 2052a in the second sub-connector 2052.

[0051] For example, the second clamping member 2051b can be fixedly connected to the third clamping member 2052a by welding, or the second clamping member 2051b and the third clamping member 2052a can be an integral structure, which is not limited in the present application.

[0052] Optionally, refer to Figure 3The first sub-connector 2051 and the second sub-connector 2052 each further include two fasteners located at both ends of each clamping member, and the two clamping members are fastened and connected by the two fasteners.

[0053] For example, the fastener includes a fastening bolt 2053 , and the first sub-connector 2051 and the second sub-connector 2052 are each configured with two fastening bolts 2053 .

[0054] For example, in the first sub-connector 2051, one end of the first hoop member 2051a can be fastened to one end of the second hoop member 2051b by a fastening bolt 2053, and the other end of the first hoop member 2051a can be fastened to the other end of the second hoop member 2051b by another fastening bolt 2053, so that the first hoop member 2051a and the second hoop member 2051b form a first annular structure, and the inner diameter of the first annular structure matches the outer diameter of the experimental casing 201, so that the first hoop member 2051a and the second hoop member 2051b are fastened to the experimental casing 201.

[0055] Similarly, in the second sub-connector 2052, one end of the third clamp member 2052a can be fastened and connected to one end of the fourth clamp member 2052b by a fastening bolt 2053, and the other end of the third clamp member 2052a can be fastened and connected to the other end of the fourth clamp member 2052b by another fastening bolt 2053, so that the third clamp member 2052a and the fourth clamp member 2052b form a second annular structure, and the inner diameter of the second annular structure matches the outer diameter of the gas injection oil pipe 203, so that the third clamp member 2052a and the fourth clamp member 2052b are fastened and connected to the gas injection oil pipe 203.

[0056] In the embodiment of the present application, the number of the first sub-connector 2051 and the second sub-connector 2052 that connect the pipe body of the experimental casing 201 and the pipe body of the gas injection oil pipe 203 can be multiple. After one end of the first experimental casing and one end of the first gas injection oil pipe are connected through the guide shoe 204, a clamping member 2051a and a clamping member 2051b are set on the outer wall of the first experimental casing, and the clamping member 2051a and the clamping member 2051b are fastened and connected by two fastening bolts 2053. Furthermore, a clamping member 2052b is set on the outer wall of the first gas injection oil pipe, and the clamping member 2052b and the clamping member 2052a are fastened and connected by two fastening bolts 2053, so that the pipe body of the first gas injection oil pipe is fixed to one side of the pipe body of the first experimental casing. After the first experimental casing is connected to the first gas injection oil pipe, the other end of the first experimental casing (i.e., the end away from the guide shoe 204) is connected to one end of the second experimental casing through threads, and the other end of the first gas injection oil pipe (i.e., the end away from the guide shoe 204) is connected to one end of the second gas injection oil pipe through threads, and then the pipe body of the second experimental casing is fixedly connected to the pipe body of the second gas injection oil pipe through a clamp and a fastening bolt. And so on, until all the experimental casings 201 and gas injection oil pipes 203 are lowered into the fixed wellbore 100.

[0057] Optionally, the simulated wellbore experiment system 000 further includes a hanger assembly 400 located outside the fixed wellbore 100. Figure 4 , Figure 4 4 is a structural schematic diagram of a suspension assembly provided in an embodiment of the present application. The hanger assembly 400 includes a first pipe hanger 401, a second pipe hanger 402 and a third pipe hanger 403. The first pipe hanger 401 is connected to an end of the experimental casing 201 away from the guide shoe 204, the second pipe hanger 402 is connected to an end of the gas injection oil pipe 203 away from the guide shoe 204, and the third pipe hanger 403 is connected to an end of the simulated production oil pipe 202 away from the guide shoe 204.

[0058] In the examples of this application, please refer to Figure 4, the simulated wellbore experimental system 000 also includes a casing head 404 and a tubing head 405. The first pipe hanger 401 and the second pipe hanger 402 are arranged in the casing head 404, and the third pipe hanger 403 is arranged in the tubing head 405. One end of the casing head 404 is fixed at the wellhead of the fixed wellbore 100, and the other end is connected to the tubing head 405. The experimental casing 201, the simulated production tubing 202 and the gas injection tubing 203 can all be connected to the tubing head 405. For example, the tubing head 405 is provided with a first valve 4051, a second valve 4052, a third valve 4053 and a fourth valve 4054. The first valve 4051 and the second valve 4052 are connected to the annulus between the experimental casing 201 and the simulated production oil pipe 202. By controlling the first valve 4051 or the second valve 4052, the liquid inflow of the annulus between the experimental casing 201 and the simulated production oil pipe 202 can be controlled. The third valve 4053 is connected to the simulated production oil pipe 202. By controlling the third valve 4053, the oil production or gas production of the simulated production oil pipe 202 can be controlled. The fourth valve 4054 is connected to the gas injection oil pipe 203. By controlling the fourth valve 4054, the gas inflow of the gas injection oil pipe 203 can be controlled.

[0059] After the experimental pipe assembly 200 is assembled and connected with the hanger assembly 400, the experimental pipe assembly 200 is lowered into the fixed wellbore 100, and then the hanger assembly 400 is placed in the casing head 404 and the tubing head 405 to complete the construction of the simulated wellbore experimental system 000.

[0060] When the simulated wellbore experimental system 000 performs a simulated test of gas production (e.g., natural gas production), the first valve 4051 or the second valve 4052 is opened to inject a preset amount of liquid (e.g., working fluid, crude oil, water, etc.) into the annulus between the experimental casing 201 and the simulated production oil pipe 202, so that the liquid is injected into the mixing cavity K of the guide shoe 204 through the annulus between the experimental casing 201 and the simulated production oil pipe 202, and reaches the bottom of the fixed wellbore 100 through the second through hole M2 of the guide shoe 204. At the same time, the fourth valve 4054 is opened to continuously inject a preset amount of gas (e.g., natural gas) into the gas injection oil pipe 203, so that the gas is injected into the mixing cavity K of the guide shoe 204 through the gas injection oil pipe 203, and enters the bottom of the fixed wellbore 100 through the second through hole M2 of the guide shoe 204, so that the gas is mixed with the liquid at the bottom of the well to form a gas-liquid two-phase flow condition, simulating the gas-liquid two-phase mixing condition at the bottom of the fixed wellbore 100. Among them, the preset amount of liquid injected into the annulus between the experimental casing 201 and the simulated production oil pipe 202 is less than the preset amount of gas injected into the gas injection oil pipe 203, and the gas injected into the gas injection oil pipe 203 is continuous, so that the gas can flow out of the simulated production oil pipe 202 through the mixing chamber K of the guide shoe 204, and then simulated production is produced from the third valve 4053. In the process of simulated gas production, it is ensured that the displacement of the simulated produced gas from the third valve 4053 is the preset gas displacement. So far, the simulated production process of gas production through the simulated wellbore experimental system 000 is completed. In this simulated production process, the simulated production situation of the simulated production process can be monitored by connecting the test device externally, and the actual wellbore production can be guided according to the monitoring results.

[0061] When the simulated wellbore experimental system 000 performs a simulated test of oil production (such as the production of crude oil, crude oil, etc.), the simulated production process of oil production can be performed with reference to the simulated production process of gas production, and this embodiment will not be repeated here. Different from the simulated production of gas production, the preset amount of gas injected into the gas injection oil pipe 203 is less than the preset amount of liquid injected into the annulus between the experimental casing 201 and the simulated production oil pipe 202, and the liquid injected into the annulus is continuous to ensure that the liquid can flow out of the simulated production oil pipe 202 through the mixing cavity K of the guide shoe 204, and then simulated production is produced from the third valve 4053. Among them, the injection amount of the liquid continuously injected into the annulus needs to ensure that the displacement of the liquid simulated from the third valve 4053 is the preset liquid displacement.

[0062] In summary, the present application provides a simulated wellbore experimental system, which includes a fixed wellbore and a replaceable experimental pipeline assembly located in the fixed wellbore. The experimental pipeline assembly includes an experimental casing, a simulated production oil pipe located in the experimental casing, a gas injection oil pipe located outside the experimental casing, a guide shoe with a mixing cavity, and a connector connecting the experimental casing and the gas injection oil pipe. One end of the experimental casing and one end of the gas injection oil pipe are both connected to the mixing cavity, and the first end of the simulated production oil pipe is located in the mixing cavity of the guide shoe. When it is necessary to perform a simulation test on the wellbore to be simulated, an experimental casing that matches the size of the wellbore to be simulated of different sizes can be selected, and the experimental casing is connected to the guide shoe that matches its size, and after being connected to the gas injection oil pipe, it is lowered into the fixed wellbore, and then the simulated production oil pipe is lowered into the experimental casing to complete the construction of the simulated wellbore experimental system. In this way, wellbores of various sizes can be simulated and tested according to the simulated wellbore experimental system, without the need to construct simulated wellbores of the same size as the wellbores of different sizes to be simulated, thereby reducing the cost of simulation testing and the cost of oil and gas field exploitation. In addition, since the simulated wellbore experimental system also includes a gas injection oil pipe, the gas injection oil pipe is connected to the experimental casing through a guide shoe, so the gas injected by the gas injection oil pipe and the liquid injected into the annulus between the experimental casing and the simulated production oil pipe can be mixed in the mixing chamber of the guide shoe to simulate the working condition of the gas-liquid two-phase mixing at the bottom of the well, so that the simulated wellbore experimental system can more realistically reflect the actual working condition at the bottom of the well, and the results of the simulation test are more accurate.

[0063] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A simulated wellbore experimental system, characterized in that: include: A fixed wellbore, and a replaceable test tubing assembly located within the fixed wellbore, and a hanger assembly located outside the fixed wellbore; The experimental pipeline assembly includes: an experimental casing, a simulated production oil pipe, a gas injection oil pipe, a guide shoe and a connector; Wherein, the hanger assembly comprises a first pipe hanger, a second pipe hanger and a third pipe hanger; The first pipe hanger is connected to one end of the experimental casing away from the guide shoe, the second pipe hanger is connected to one end of the gas injection tubing away from the guide shoe, and the third pipe hanger is connected to one end of the simulated production tubing away from the guide shoe; The gas injection oil pipe is located outside the experimental casing and is connected to the experimental casing through the connecting piece; The guide shoe has a mixing cavity, the guide shoe is respectively connected to one end of the experimental casing and one end of the gas injection oil pipe, and the experimental casing and the gas injection oil pipe are both connected to the mixing cavity; The side wall of the guide shoe is provided with a protruding structure, the protruding structure has a first through hole communicating with the mixing cavity, and one end of the gas injection oil pipe is connected to the protruding structure; One end of the test casing is threadedly connected to the guide shoe, and one end of the gas injection oil pipe is threadedly connected to the protruding structure; The guide shoe also has a second through hole connected to the mixing chamber, and the second through hole is located on a side of the guide shoe away from the experimental casing; The simulated production oil pipe is located in the experimental casing, and the first end of the simulated production oil pipe is located in the mixing cavity of the guide shoe; The connecting piece comprises: a first sub-connecting piece connected to the outer wall of the experimental casing, and a second sub-connecting piece connected to the outer wall of the gas injection oil pipe, wherein the first sub-connecting piece is fixedly connected to the second sub-connecting piece; The first sub-connector and the second sub-connector both include: two mutually connected clamping members and two fasteners located at both ends of each clamping member, each clamping member is a semi-annular structure, the two clamping members are fastened and connected by the two fasteners, and one clamping member in the first sub-connector is fixedly connected to one clamping member in the second sub-connector.

2. The simulated wellbore experimental system according to claim 1, characterized in that: The fastener comprises: a fastening bolt.

3. The simulated wellbore experimental system according to claim 1 or 2, characterized in that: The simulated wellbore experimental system also includes: a fixed casing located in the fixed wellbore and connected to the inner wall of the fixed wellbore.

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