Branch subdivision rotation production process pipe column and method for multi-branch horizontal well

Abstract

The invention discloses a multi-branch horizontal well branch subdivision rotation production process pipe column and method. The multi-branch horizontal well branch subdivision rotation production process pipe column comprises a main branch pipe column, a first branch sand control section releasing pipe column and a second branch sand control section releasing pipe column. The vertical end of the main branch pipe column sequentially comprises a first cable passing production packer, a first electric control bottom-hole regulator, a second cable passing production packer and a second electric control bottom-hole regulator from top to bottom, the horizontal end of the main branch pipe column is provided with a plurality of cabins, and each cabin is internally provided with an electric control bottom-hole regulator; the end of the first branch sand prevention section releasing tubular column is arranged at the lower end of the second cable passing production packer, the end of the second branch sand prevention section releasing tubular column is arranged between the first cable passing production packer and the second cable passing production packer, and a plurality of cabins are arranged in the first branch sand prevention section releasing tubular column and the second branch sand prevention section releasing tubular column respectively. And a pressure-controlled bottom-hole regulator is arranged in each cabin. According to the invention, the bottom-hole regulator corresponding to each branch production cabin is opened or closed according to production requirements, so as to realize multi-branch alternate production or commingled production.

Description

Technical Field

[0001] The present invention belongs to the technical field of refined water control for multi-branch horizontal wells, and particularly relates to a multi-branch horizontal well branch and compartment wheel production process string and method. Background Art

[0002] Multi-branch horizontal wells have a large liquid production volume, and there are significant differences in the physical properties of the reservoirs of each branch and the water cut of the produced liquid. When each branch is produced under the same production regime, it is easy to cause unbalanced production between the branches, thereby reducing the oil recovery rate of the oil well.

[0003] To improve the water flooding development effect and meet the production needs of the oil reservoir, it is necessary to achieve multi-branch wheel production and refined control of the liquid production volume of each branch.

[0004] At present, there are no effective measures for refined control of oil stabilization and water control in multi-branch horizontal wells. Therefore, there is an urgent need for a multi-branch horizontal well compartment wheel production water control method and a supporting process string to achieve efficient and refined oil stabilization and water control in multi-branch horizontal wells. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a multi-branch horizontal well branch and compartment wheel production process string and method to achieve refined control of multi-branch wheel production, combined production of multi-branch horizontal wells, and the liquid production volume of each production compartment of each branch, and provide technical support for oil stabilization and water control in multi-branch horizontal wells.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a multi-branch horizontal well branch and compartment wheel production process string, including a main branch string, a first branch sand control section releasing string, and a second branch sand control section releasing string. The main branch string is arranged in an "L" shape. The vertical end of the main branch string sequentially includes a tubing string, a canned pump system, a first cable passing production packer, a first electric control flow controller, a second cable passing production packer, and a second electric control flow controller from top to bottom. The horizontal end of the main branch string is provided with multiple sets of sealing devices, and the multiple sets of sealing devices divide the horizontal end of the main branch string into multiple compartments, and each compartment is provided with an electric control flow controller. The first branch sand control section releasing string is communicated with the main branch string, and the end of the first branch sand control section releasing string is placed below the second cable passing production packer. Multiple sets of sealing devices are arranged in the first branch sand control section releasing string, and the multiple sets of sealing devices divide the first branch sand control section releasing string into multiple compartments, and each compartment is provided with a pressure control flow controller. The second branch sand control section releasing string is communicated with the main branch string, and the end of the second branch sand control section releasing string is placed between the first cable passing production packer and the second cable passing production packer. Multiple sets of sealing devices are arranged in the second branch sand control section releasing string, and the multiple sets of sealing devices divide the second branch sand control section releasing string into multiple compartments, and each compartment is provided with a pressure control flow controller.

[0007] Further, the horizontal end of the main branch string, from near the vertical end of the main branch string to far from the vertical end of the main branch string, sequentially includes a first end sealing device, a third electric control production distributor, a first middle sealing device, a fourth electric control production distributor, and a first round plug. The first end sealing device includes a first top packer and a first cable passing positioning seal. The first middle sealing device includes a first expandable packer and a first cable passing insertion seal. The first end sealing device and the first middle sealing device cooperate to separate the inside and outside of the first screen pipe at the horizontal end of the main branch string into two independent first production compartments, and the third electric control production distributor and the fourth electric control production distributor are respectively arranged in the two independent first production compartments.

[0008] Further, the first top packer cooperates with the second cable passing production packer above it to separate the releasing string of the first branch sand control section into independent production units, and the second electric control production distributor is correspondingly arranged in the string.

[0009] Further, the releasing string of the first branch sand control section, from near the vertical end of the main branch string to far from the vertical end of the main branch string, sequentially includes a first releasing tool, a second end sealing device, a first pressure control production distributor, a second middle sealing device, a second pressure control production distributor, and a second round plug. The second end sealing device includes a second top packer and a second cable passing positioning seal. The second middle sealing device includes a second expandable packer and a second cable passing insertion seal. The second end sealing device and the second middle sealing device cooperate to separate the inside and outside of the second screen pipe of the releasing string of the first branch sand control section into two independent second production compartments, and the first pressure control production distributor and the second pressure control production distributor are respectively arranged in the two independent second production compartments.

[0010] Further, the second cable passing production packer cooperates with the first cable passing production packer to separate the releasing string of the second branch sand control section into independent production units, and the first electric control production distributor is correspondingly arranged in the string.

[0011] Further, the releasing string of the second branch sand control section sequentially includes a second releasing tool, a third end sealing device, a third pressure-controlled production distributor, a third middle sealing device, a fourth pressure-controlled production distributor, and a third round plug from near the vertical end of the main branch string to far from the vertical end of the main branch string. The third end sealing device includes a third top packer and a third cable passing positioning seal. The third middle sealing device includes a third expandable packer and a third cable passing insertion seal. The third end sealing device and the third middle sealing device cooperate to separate the inside and outside of the third screen pipe of the releasing string of the second branch sand control section into two independent third production compartments, and the third pressure-controlled production distributor and the fourth pressure-controlled production distributor are respectively arranged in the two independent third production compartments.

[0012] Further, the present invention provides a process method for branch-by-branch and compartment-by-compartment alternating production of a multi-branch horizontal well. Using the above-mentioned process string for branch-by-branch and compartment-by-compartment alternating production of a multi-branch horizontal well, it includes the following steps.

[0013] S1: Adjust the opening number of the electric control production distributors to achieve multi-branch alternating production.

[0014] S2: Adjust the opening number of the electric control production distributors to achieve multi-branch combined production.

[0015] S3: Adjust the opening degree of each electric control production distributor to achieve refined control of the liquid production volume.

[0016] Further, the S1 includes the following steps.

[0017] S11: Open the second electric control production distributor, and close the first, third, and fourth electric control production distributors to achieve separate production of the releasing string of the first branch sand control section.

[0018] S12: Open the first electric control production distributor, and close the second, third, and fourth electric control production distributors to achieve separate production of the releasing string of the second branch sand control section.

[0019] S13: Open the third and fourth electric control production distributors, and close the first and second electric control production distributors to achieve separate production of the main branch string.

[0020] Further, the S2 includes the following steps.

[0021] S21: Open the first and second electric control production distributors, and close the third and fourth electric control production distributors to achieve combined production of the releasing string of the first branch sand control section and the releasing string of the second branch sand control section.

[0022] S22: Open the first electric control production distributor, the third electric control production distributor, and the fourth electric control production distributor, and close the second electric control production distributor to achieve combined production of the main branch string and the releasing string of the second branch sand control section;

[0023] S23: Open the second electric control production distributor, the third electric control production distributor, and the fourth electric control production distributor, and close the first electric control production distributor to achieve combined production of the main branch string and the releasing string of the first branch sand control section.

[0024] Further, S3 includes the following steps

[0025] S31: Open the second electric control production distributor, close the first electric control production distributor, the third electric control production distributor, and the fourth electric control production distributor, and control and adjust the opening degrees of the pressure control production distributors of the releasing string of the first branch sand control section through ground pressure wave commands to achieve refined control of the liquid production volume of each compartment of the releasing string of the first branch sand control section;

[0026] S32: Open the first electric control production distributor, close the second electric control production distributor, the third electric control production distributor, and the fourth electric control production distributor, and control and adjust the opening degrees of the pressure control production distributors of the releasing string of the second branch sand control section through ground pressure wave commands to achieve refined control of the liquid production volume of each compartment of the releasing string of the second branch sand control section.

[0027] The advantages and positive effects of the present invention are:

[0028] The present invention aims at multi-branch horizontal wells and through the cooperation of various tools, divides the main branch and each branch of the horizontal well into independent production compartments. According to production needs, open or close the corresponding production distributors of each branch production compartment to achieve multi-branch alternate production or combined production. Control the opening degrees of each electric control production distributor through a signal cable to finely control the liquid production volume of each production compartment of the branch and the main branch. Control the opening degrees of the cableless pressure control production distributors corresponding to each production compartment of each branch through ground pressure wave commands to achieve fine control of the liquid production volume of each production compartment of each branch, providing technical support for stabilizing oil production and controlling water in multi-branch horizontal wells. Description of the Drawings

[0029] Figure 1 is the overall structural schematic diagram of the pipe string embodiment of the present invention.

[0030] Figure 2 is the overall flow schematic diagram of the method embodiment of the present invention.

[0031] In the figure:

[0032] 1. Main branch string; 1-1. First top packer; 1-2. Third electric control flow regulator; 1-3. First expansion packer; 1-4. Fourth electric control flow regulator; 1-5. First screen pipe; 1-6. First cable through locating seal; 1-7. First cable through insertion seal; 1-8. First round plug.

[0033] 2. First branch sand control section releasing string; 2-1. First releasing tool; 2-2. Second top packer; 2-3. Second cable through insertion seal; 2-4. Second cable through locating seal; 2-5. First pressure control flow regulator; 2-6. Second expansion packer; 2-7. Second pressure control flow regulator; 2-8. Second round plug; 2-9. Second screen pipe.

[0034] 3. Second branch sand control section releasing string; 3-1. Second releasing tool; 3-2. Third top packer; 3-3. Third pressure control flow regulator; 3-4. Third expansion packer; 3-5. Fourth pressure control flow regulator; 3-6. Third screen pipe; 3-7. Third round plug; 3-8. Third cable through locating seal; 3-9. Third cable through insertion seal.

[0035] 4. Tubing.

[0036] 5. Signal cable.

[0037] 6. Canned pump system.

[0038] 7. First cable through production packer.

[0039] 8. First electric control flow regulator.

[0040] 9. Second cable through production packer.

[0041] 10. Second electric control flow regulator.

[0042] 11. Hydraulic control pipeline.

[0043] 12. Downhole safety valve.

[0044] 13. Electric pump cable. Specific implementation mode

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The following further describes the embodiments of the present invention with reference to the drawings:

[0049] As Figure 1 shown, a multi-branch horizontal well branch and compartment wheel production process string includes a main branch string 1, a first branch sand control section releasing string 2, and a second branch sand control section releasing string 3. The main branch string 1 is arranged in an "L" shape. The vertical end of the main branch string 1 sequentially includes a tubing 4, a canned pump system 6, a first cable-passing production packer 7, a first electric control production distributor 8, a second cable-passing production packer 9, and a second electric control production distributor 10 from top to bottom. A downhole safety valve 12 is provided on the tubing 4, and the downhole safety valve 12 is connected to a hydraulic control pipeline 11. The canned pump system 6 is connected to an electric pump cable 13. The horizontal end of the main branch string 1 is provided with multiple sets of sealing devices, and the multiple sets of sealing devices divide the horizontal end of the main branch string 1 into multiple production compartments, and each production compartment is provided with an electric control production distributor. The first branch sand control section releasing string 2 is communicated with the main branch string 1, and the end of the first branch sand control section releasing string 2 is placed below the second cable-passing production packer 9. Multiple sets of sealing devices are provided in the first branch sand control section releasing string 2, and the multiple sets of sealing devices divide the first branch sand control section releasing string 2 into multiple production compartments, and each production compartment is provided with a pressure control production distributor. The second branch sand control section releasing string 3 is communicated with the main branch string 1, and the end of the second branch sand control section releasing string 3 is placed between the first cable-passing production packer 7 and the second cable-passing production packer 9. Multiple sets of sealing devices are provided in the second branch sand control section releasing string 3, and the multiple sets of sealing devices divide the second branch sand control section releasing string 3 into multiple production compartments, and each production compartment is provided with a pressure control production distributor.

[0050] Specifically, the horizontal end of the main branch string 1, from the end near the vertical end of the main branch string 1 to the end far from the vertical end of the main branch string 1, successively includes a first end sealing device, a third electric control flow regulator 1-2, a first middle sealing device, a fourth electric control flow regulator 1-4, and a first round plug 1-8. The first electric control flow regulator 8, the second electric control flow regulator 10, the third electric control flow regulator 1-2, and the fourth electric control flow regulator 1-4 are respectively connected to a signal cable 5. The first end sealing device includes a first top packer 1-1 and a first cable-passing positioning seal 1-6. The first middle sealing device includes a first expandable packer 1-3 and a first cable-passing insertion seal 1-7. The first end sealing device and the first middle sealing device cooperate to separate the inside and outside of the first screen pipe 1-5 at the horizontal end of the main branch string 1 into two independent first production compartments, and the third electric control flow regulator 1-2 and the fourth electric control flow regulator 1-4 are respectively arranged in the two independent first production compartments.

[0051] The first top packer 1-1 cooperates with the second cable-passing production packer 9 above it to separate the first branch sand control section releasing string 2 into independent production units, and a second electric control flow regulator 10 is correspondingly arranged in the string.

[0052] Specifically, the first branch sand control section releasing string 2, from the end near the vertical end of the main branch string 1 to the end far from the vertical end of the main branch string 1, successively includes a first releasing tool 2-1, a second end sealing device, a first pressure control flow regulator 2-5, a second middle sealing device, a second pressure control flow regulator 2-7, and a second round plug 2-8. The second end sealing device includes a second top packer 2-2 and a second cable-passing positioning seal 2-4. The second middle sealing device includes a second expandable packer 2-6 and a second cable-passing insertion seal 2-3. The second end sealing device and the second middle sealing device cooperate to separate the inside and outside of the second screen pipe 2-9 of the first branch sand control section releasing string 2 into two independent second production compartments, and the first pressure control flow regulator 2-5 and the second pressure control flow regulator 2-7 are respectively arranged in the two independent second production compartments.

[0053] The second cable-passing production packer 9 cooperates with the first cable-passing production packer 7 to separate the second branch sand control section releasing string 3 into independent production units, and a first electric control flow regulator 8 is correspondingly arranged in the string.

[0054] Specifically, the releasing string 3 of the second branch sand control section sequentially includes a second releasing tool 3-1, a third end sealing device, a third pressure-controlled production distributor 3-3, a third middle sealing device, a fourth pressure-controlled production distributor 3-5, and a third round plug 3-7 from the vertical end of the main branch string 1 close to the vertical end of the main branch string 1 away from the vertical end of the main branch string 1. The third end sealing device includes a third top packer 3-2 and a third cable-passing positioning seal 3-8. The third middle sealing device includes a third expansion packer 3-4 and a third cable-passing insertion seal 3-9. The third end sealing device and the third middle sealing device cooperate to separate the inside and outside of the third screen pipe 3-6 of the releasing string 3 of the second branch sand control section into two independent third production compartments, and the third pressure-controlled production distributor 3-3 and the fourth pressure-controlled production distributor 3-5 are respectively arranged in the two independent third production compartments.

[0055] As Figure 2 shown, the present invention also provides a process method for branch-by-branch sectionalized production in a multi-branch horizontal well. Using the above-mentioned process string for branch-by-branch sectionalized production in a multi-branch horizontal well, the method includes the following steps.

[0056] S1: Adjust the opening number of the electric control production distributors to achieve multi-branch sectionalized production. Specifically, S1 includes the following steps.

[0057] S11: Open the second electric control production distributor 10, and close the first electric control production distributor 8, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4 to achieve separate production of the releasing string 2 of the first branch sand control section.

[0058] S12: Open the first electric control production distributor 8, and close the second electric control production distributor 10, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4 to achieve separate production of the releasing string 3 of the second branch sand control section.

[0059] S13: Open the third electric control production distributor 1-2 and the fourth electric control production distributor 1-4, and close the first electric control production distributor 8 and the second electric control production distributor 10 to achieve separate production of the main branch string 1.

[0060] S2: Adjust the opening number of the electric control production distributors to achieve multi-branch combined production. Specifically, S2 includes the following steps.

[0061] S21: Open the first electric control production distributor 8 and the second electric control production distributor 10, and close the third electric control production distributor 1-2 and the fourth electric control production distributor 1-4 to achieve combined production of the releasing string 2 of the first branch sand control section and the releasing string 3 of the second branch sand control section.

[0062] S22: Open the first electric control production distributor 8, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4, and close the second electric control production distributor 10 to achieve combined production of the main branch string 1 and the releasing string 3 of the second branch sand control section.

[0063] S23: Open the second electric control production distributor 10, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4, and close the first electric control production distributor 8 to achieve combined production of the main branch string 1 and the releasing string 2 of the first branch sand control section.

[0064] S3: Adjust the opening degrees of each electric control production distributor to achieve refined control of the liquid production volume. The electric control production distributor can simultaneously monitor flow rate, temperature, pressure, and water cut, and adjust the production regime in a timely manner according to the real-time monitoring data of the production distributor. Adjust the opening degrees of each electric control production distributor through the signal cable 5 to achieve refined control of the liquid production volume. Specifically, S3 includes the following steps.

[0065] S31: Open the second electric control production distributor 10, close the first electric control production distributor 8, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4, and control and adjust the opening degrees of each pressure control production distributor of the releasing string 2 of the first branch sand control section through the ground pressure wave command to achieve refined control of the liquid production volume of each compartment of the releasing string 2 of the first branch sand control section.

[0066] S32: Open the first electric control production distributor 8, close the second electric control production distributor 10, the third electric control production distributor 1-2, and the fourth electric control production distributor 1-4, and control and adjust the opening degrees of each pressure control production distributor of the releasing string 3 of the second branch sand control section through the ground pressure wave command to achieve refined control of the liquid production volume of each compartment of the releasing string 3 of the second branch sand control section.

[0067] The working principle of the present invention is as follows:

[0068] The present invention is lowered in three trips of tubing strings. Among them, in the first trip, the releasing string 2 for the first branch sand control section is lowered. After the releasing string 2 for the first branch sand control section is lowered to the designed position, the tubing 4 above the first releasing tool 2-1 is pulled out. Through the cooperation of the second positioning seal 2-4 and the second top packer 2-2, and the cooperation of the second insertion seal 2-3 and the second expansion packer 2-6 outside the second screen pipe 2-9, the inside and outside of the second screen pipe 2-9 are separated, and the sand control section of the releasing string 2 for the first branch sand control section is divided into two independent production compartments. In the second trip, the releasing string 3 for the second branch sand control section is lowered. After the releasing string 3 for the second branch sand control section is lowered to the designed position, the tubing 4 above the second releasing tool 3-1 is pulled out. Through the cooperation of the third cable passing positioning seal 3-8 and the third top packer 3-2, and the cooperation of the third cable passing insertion seal 3-9 and the third expansion packer 3-4 outside the third screen pipe 3-6, the inside and outside of the third screen pipe 3-6 are separated, and the sand control section of the releasing string 3 for the second branch sand control section is divided into two independent production compartments. In the third trip, the tubing 4 carrying the downhole safety valve 12, the canned pump system 6, the first cable passing production packer 7, the second cable passing production packer 9, the first electric control flow distributor 8, the second electric control flow distributor 10, etc. is lowered to the designed position of the main branch tubing string 1. The first cable passing production packer 7 and the second cable passing production packer 9 are set by pressure inside the tubing 4. The sand control section tubing string of the horizontal well main branch tubing string 1 is cooperated with the first top packer 1-1 through the first cable passing positioning seal 1-6, and the first cable passing insertion seal 1-7 is cooperated with the first expansion packer 1-3 outside the first screen pipe 1-5 to separate the inside and outside of the first screen pipe 1-5, and the sand control section is divided into multiple production compartments. The first top packer 1-1 cooperates with the second cable passing production packer 9 above it to separate the releasing string 2 for the first branch sand control section into independent production units. The second cable passing production packer 9 cooperates with the first cable passing production packer 7 to separate the releasing string 3 for the second branch sand control section into independent production units.

[0069] Specific discussions are made on the water breakthrough conditions of each compartment and each branch of the main branch of the horizontal well. According to the measured flow rate, temperature, pressure, and water cut of each electric control flow distributor, if the water cut of the releasing string 3 in the sand control section of the second branch increases, the first electric control flow distributor 8 is opened, and the second electric control flow distributor 10, the third electric control flow distributor 1-2, and the fourth electric control flow distributor 1-4 are closed. The fourth pressure control flow distributor 3-5 is opened and the third pressure control flow distributor 3-3 is closed through the ground pressure wave command to separately produce the first production compartment of the releasing string 3 in the sand control section of the second branch and separately test the water cut. The third pressure control flow distributor 3-3 is opened and the fourth pressure control flow distributor 3-5 is closed through the ground pressure wave command to separately produce the second production compartment of the releasing string 3 in the sand control section of the second branch and separately test the water cut. Combining the water cut tests of each compartment of the releasing string 3 in the sand control section of the second branch and the reservoir numerical simulation, the production system is adjusted. The opening degrees of the pressure control flow distributors of each production compartment of the releasing string 3 in the sand control section of the second branch are controlled and adjusted through the ground pressure wave command, and the opening degree of the first electric control flow distributor 8 is controlled through the signal cable 5 to achieve fine water control of the releasing string 3 in the sand control section of the second branch. If the water cut of the releasing string 2 in the sand control section of the first branch increases, fine water control of the releasing string 2 in the sand control section of the first branch can be achieved by controlling and adjusting the opening degrees of the cableless pressure control flow distributors of each production compartment of the releasing string 3 in the sand control section of the second branch and the second electric control flow distributor 10. If the water cut of the production compartment of the main branch increases, the production system is adjusted by combining the reservoir numerical simulation and the measured flow rate, temperature, pressure, and water cut of each flow distributor. The opening degree of the corresponding electric control flow distributor of the production compartment with increased water cut is controlled and adjusted through the signal cable 5 to achieve fine water control of the main branch string 1.

[0070] The advantages and positive effects of the present invention are as follows:

[0071] The present invention aims at multi-branch horizontal wells and through the cooperation of various tools, divides the main branch and each branch of the horizontal well into independent production compartments. The corresponding flow distributors of each branch production compartment are opened or closed according to production needs to achieve multi-branch alternate production or combined production. The opening degrees of each electric control flow distributor are controlled through the signal cable to finely control the liquid production of each production compartment of the branch and the main branch. The opening degrees of the corresponding cableless pressure control flow distributors of each production compartment of each branch are controlled through the ground pressure wave command to achieve fine control of the liquid production of each production compartment of each branch, providing technical support for oil stabilization and water control of multi-branch horizontal wells.

[0072] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A multi-branch horizontal well branch and compartment wheel sampling process string, characterized in that: It includes a main branch string, a releasing string for the first branch sand control section, and a releasing string for the second branch sand control section. The main branch string is arranged in an "L" shape. The vertical end of the main branch string successively includes a tubing string, a canned pump system, a first cable passing production packer, a first electric control flow regulator, a second cable passing production packer, and a second electric control flow regulator from top to bottom. The horizontal end of the main branch string is provided with multiple sets of sealing devices, and the multiple sets of sealing devices divide the horizontal end of the main branch string into multiple compartments, and each compartment is provided with an electric control flow regulator; the releasing string for the first branch sand control section is communicated with the main branch string, the end of the releasing string for the first branch sand control section is placed at the lower end of the second cable passing production packer, and multiple sets of the sealing devices are arranged in the releasing string for the first branch sand control section, and the multiple sets of sealing devices divide the releasing string for the first branch sand control section into multiple compartments, and each compartment is provided with a pressure control flow regulator; the releasing string for the second branch sand control section is communicated with the main branch string, the end of the releasing string for the second branch sand control section is placed between the first cable passing production packer and the second cable passing production packer, and multiple sets of the sealing devices are arranged in the releasing string for the second branch sand control section, and the multiple sets of sealing devices divide the releasing string for the second branch sand control section into multiple compartments, and each compartment is provided with a pressure control flow regulator.

2. The multi-branch horizontal well branch and compartment wheel production process string according to claim 1, characterized in that: The horizontal end of the main branch string successively includes a first end sealing device, a third electric control flow regulator, a first middle sealing device, a fourth electric control flow regulator, and a first round plug from the side close to the vertical end of the main branch string to the side far from the vertical end of the main branch string. The first end sealing device includes a first top packer and a first cable passing positioning seal. The first middle sealing device includes a first expandable packer and a first cable passing insertion seal. The first end sealing device and the first middle sealing device cooperate to separate the inside and outside of the first screen pipe at the horizontal end of the main branch string into two independent first production compartments, and the third electric control flow regulator and the fourth electric control flow regulator are respectively arranged in the two independent first production compartments.

3. The multi-branch horizontal well branch and compartment wheel production process string according to claim 2, characterized in that: The first top packer cooperates with the second cable passing production packer above it to divide the releasing string for the first branch sand control section into independent production units, and the second electric control flow regulator is correspondingly arranged in the string.

4. A multi-branch horizontal well branch and compartment wheel sampling process string according to any one of claims 1 to 3, characterized in that: The releasing string for the first branch sand control section successively includes a first releasing tool, a second end sealing device, a first pressure control flow regulator, a second middle sealing device, a second pressure control flow regulator, and a second round plug from the side close to the vertical end of the main branch string to the side far from the vertical end of the main branch string. The second end sealing device includes a second top packer and a second cable passing positioning seal. The second middle sealing device includes a second expandable packer and a second cable passing insertion seal. The second end sealing device and the second middle sealing device cooperate to separate the inside and outside of the second screen pipe in the releasing string for the first branch sand control section into two independent second production compartments, and the first pressure control flow regulator and the second pressure control flow regulator are respectively arranged in the two independent second production compartments.

5. A multi-branch horizontal well branch and compartment wheel production process string according to any one of claims 1 to 3, characterized in that: The second through-cable production packer cooperates with the first through-cable production packer to separate the release string of the second branch sand control section into independent production units, and a first electric control flow controller is correspondingly arranged in the string.

6. A multi-branch horizontal well branch and compartment wheel sampling process string according to any one of claims 1 to 3, characterized in that: The release string of the second branch sand control section sequentially includes a second release tool, a third end sealing device, a third pressure control flow controller, a third middle sealing device, a fourth pressure control flow controller, and a third round plug from the vertical end close to the main branch string to the vertical end far from the main branch string. The third end sealing device includes a third top packer and a third through-cable positioning seal. The third middle sealing device includes a third expansion packer and a third through-cable insertion seal. The third end sealing device and the third middle sealing device cooperate to separate the inside and outside of the third screen pipe of the release string of the second branch sand control section into two independent third production compartments, and the third pressure control flow controller and the fourth pressure control flow controller are respectively arranged in the two independent third production compartments.

7. A process method for sectionalized cyclic production in a multi-branch horizontal well, which utilizes the sectionalized cyclic production string for a multi-branch horizontal well according to any one of claims 1 to 6, and is characterized in that: It includes the following steps S1: Adjust the opening quantity of the electric control flow controller to achieve multi-branch cyclic production. S2: Adjust the opening quantity of the electric control flow controller to achieve multi-branch combined production. S3: Adjust the opening degree of each electric control flow controller to achieve refined control of the liquid production volume.

8. A multi-branch horizontal well branch and compartment wheel production process method according to claim 7, characterized in that: The S1 includes the following steps S11: Open the second electric control flow controller, and close the first electric control flow controller, the third electric control flow controller, and the fourth electric control flow controller to achieve independent production of the release string of the first branch sand control section. S12: Open the first electric control flow controller, and close the second electric control flow controller, the third electric control flow controller, and the fourth electric control flow controller to achieve independent production of the release string of the second branch sand control section. S13: Open the third electric control flow controller and the fourth electric control flow controller, and close the first electric control flow controller and the second electric control flow controller to achieve independent production of the main branch string.

9. A multi-branch horizontal well branch and compartment wheel production process method according to claim 7 or 8, characterized in that: The S2 includes the following steps S21: Open the first electric control flow controller and the second electric control flow controller, and close the third electric control flow controller and the fourth electric control flow controller to achieve combined production of the release string of the first branch sand control section and the release string of the second branch sand control section. S22: Open the first electric control flow controller, the third electric control flow controller, and the fourth electric control flow controller, and close the second electric control flow controller to achieve combined production of the main branch string and the release string of the second branch sand control section. S23: Open the second electric control flow controller, the third electric control flow controller, and the fourth electric control flow controller, and close the first electric control flow controller to achieve combined production of the main branch string and the release string of the first branch sand control section.

10. A multi-branch horizontal well branch and compartment wheel production process method according to claim 7 or 8, characterized in that: The S3 includes the following steps S31: Open the second electric control flow controller, and close the first electric control flow controller, the third electric control flow controller, and the fourth electric control flow controller. Control and adjust the opening degree of each pressure control flow controller of the release string of the first branch sand control section through ground pressure wave commands to achieve refined control of the liquid production volume of each compartment of the release string of the first branch sand control section. S32: Open the first electric control flow regulator, close the second, third, and fourth electric control flow regulators, and control and adjust the opening degrees of the pressure control flow regulators of each section of the release string in the second branch sand control section through ground pressure wave commands, so as to achieve refined control of the liquid production volume of each compartment of the release string in the second branch sand control section.

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