A method for quickly identifying and controlling water output positions in horizontal wells

Abstract

The present invention provides a method for rapidly identifying and controlling the water outlet position of a horizontal well, comprising four steps: regional division, pressurized sealing, water content detection, and sealing and water control. The horizontal well is divided into multiple small sections by means of a packer and a packer production device. Each small section is then pressurized and tested. If the water content of the small section decreases after pressurization and sealing, it is a water-exporting section; otherwise, it is a normal section. The water-exporting section is kept pressurized and sealed to achieve water control. The purpose of the present invention is to provide a method for rapidly identifying and controlling the water outlet position of a horizontal well, capable of rapidly identifying the location of a water outlet point or a heavily flooded area in a horizontal well section ranging from one kilometer to several thousand meters, and simultaneously controlling the water outlet point.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield exploitation, and in particular to a method for quickly identifying and controlling water output positions of horizontal wells. Background Art

[0002] In oilfields developed through waterflooding, the dual effects of reservoir heterogeneity and natural or artificial fractures created by hydraulic fracturing can easily cause water channeling or flooding at specific points or areas in the horizontal section of horizontal wells during production. This results in accelerated water cut increases in the horizontal wells, leading to violent waterlogging. Since identifying and managing water-out points or areas of severe waterlogging in horizontal wells is extremely difficult, many horizontal wells experience severe waterlogging. This not only adversely impacts reservoir development in less flooded areas, but also reduces the economic benefits of horizontal well development due to increased water production, and in severe cases, can even require the well to be shut down or halted.

[0003] In view of the above situation, in order to quickly restore normal production of high- and ultra-high water-cut horizontal wells, it is necessary to design a method for quickly identifying and controlling the water outlet position of horizontal wells. This method can quickly identify the location of water outlet points or heavily flooded areas in horizontal well sections ranging from one to several thousand meters, and simultaneously control the water outlet points. Summary of the Invention

[0004] The present invention provides a method for quickly identifying and controlling the water outlet position of a horizontal well, which can quickly identify the location of the water outlet point or the heavily flooded area in a horizontal well section of one kilometer to several thousand meters, and simultaneously control the water outlet point.

[0005] To this end, the technical solution adopted is a method for quickly identifying and controlling the water outlet position of a horizontal well of the present invention, comprising the following steps:

[0006] Step 1: Zone division: Use packers and packer-producer devices to divide the horizontal well section into multiple small sections. Each small section is equipped with a set of packers and packer-producer devices, which are connected to the pressure source through tubing.

[0007] Step 2: Pressurize and seal. Open the pressure source and pressurize the packer and the packer-producer in the corresponding horizontal well section in turn. At this time, the corresponding horizontal well section is sealed.

[0008] Step 3: Water cut detection: The oil well pump keeps pumping oil and measures the change in the water cut of the oil. If the water cut decreases, the sealed section is a water-producing section. If the water cut increases, the section is normal. Seal and detect each small section of the horizontal well in turn.

[0009] Step 4: Close and control water. While detecting the outlet section, keep the section in a pressurized and closed state, and cancel the closure of other normal sections, so as to control the water in the outlet section.

[0010] Preferably, in step 1, the pressure source is connected to the packers in each small section and the packer production controller via a plurality of pressure pipes, and each of the pressure pipes is connected to a control valve.

[0011] Preferably, it includes an oil production component, a pressurizing component and multiple groups of separation components, the oil production component includes casing and oil pipe, an oil-casing annulus is formed in the casing, the oil pipe is arranged in the casing and a pumping pump is connected to the oil pipe; each group of the separation components includes a packer and a packer-producer, the packer and the packer-producer are arranged in the oil-casing annulus for separating the horizontal well into multiple small sections; the pressurizing component includes a pressure source, a pressure pipe and a control valve, the pressure source is connected to the packer and the packer-producer through the pressure pipe and the oil-casing annulus.

[0012] Preferably, a Christmas tree is further included, which is arranged at the wellhead of the oil well and is connected to the oil pipe and casing respectively.

[0013] Preferably, the sealer includes: a connecting head, a pressure tube, an expansion cylinder, a rubber tube seat and a central axis. Two rubber tube seats are respectively provided at both ends of the expansion cylinder. A connecting head is provided at the end of the rubber tube seat away from the expansion cylinder. The central axis is provided in the central part of the device for support. The pressure tube is connected to the expansion cylinder for controlling the expansion cylinder to pressurize, seal and unseal.

[0014] The working principle and beneficial technical effects of the present invention are as follows: when making judgments and controlling water, the horizontal well is first divided into multiple small sections by cooperating with the isolation and production device, and then the isolation and production device in each small section are pressurized and sealed in turn. When the small section is pressurized and sealed, the oil pump continues to pump oil and detects the water content of the oil. If the water content of the oil decreases, it proves that the small section is a water-producing section. If the water content increases, the section is a normal section. By pressurizing and testing each small section in turn, the position of each water-producing section can be detected, the water-producing section is kept pressurized, and the water-producing small section is sealed by cooperating with the isolation and production device to achieve water control.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic structural diagram of a method for rapidly identifying and controlling water output positions in a horizontal well according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the packer structure in a method for quickly identifying and controlling water output from a horizontal well according to an embodiment of the present invention Figure 1 ;

[0020] Figure 3 Schematic diagram of the packer structure in a method for quickly identifying and controlling water output from a horizontal well according to an embodiment of the present invention Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the structure of a filtering module in a method for rapidly identifying and controlling water outlet positions of horizontal wells according to an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the discharge assembly structure in a method for quickly identifying and controlling water output from a horizontal well according to an embodiment of the present invention Figure 1 ;

[0023] Figure 6 Schematic diagram of the discharge assembly structure in a method for quickly identifying and controlling water output from a horizontal well according to an embodiment of the present invention Figure 2 .

[0024] The markings in the accompanying drawings are as follows: 1. Oil production assembly; 11. Casing; 12. Oil pipe; 13. Oil casing annulus; 14. Oil well pump; 15. Oil production tree; 2. Pressurization assembly; 21. Pressure source; 22. Pressure guide pipe; 23. Control valve; 24. Booster pump; 3. Separation assembly; 31. Packer; 32. Packer and production device; 33. Connector; 34. Pressure pipe; 35. Expansion tube; 36. Cylinder seat; 37. Center shaft; 4. Filter module; 401. Filter box; 402. Water inlet; 403. Flange connection block ; 404, water outlet; 405, filter sleeve; 406, intermediate cavity; 407, filter main shaft; 408, drive motor; 409, drive gear; 410, drive sleeve; 411, driven gear; 412, filter push plate; 413, first axial sleeve; 414, second axial sleeve; 415, partition plate; 416, filter cavity; 417, guide shaft; 418, tension spring; 5, discharge assembly; 51, closing plate; 52, discharge port; 53, shift block; 54, scraper; 55, connecting strip. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] An embodiment of the present invention provides a method for quickly identifying and controlling water output positions in a horizontal well, comprising the following steps:

[0027] Step 1: Regional division: The horizontal well section is divided into multiple small sections by using a packer 31 and a packer-producer 32 in combination. Each small section is provided with a set of packers 31 and packer-producer 32. The packers 31 and packer-producer 32 are connected to the pressure source 21 through the oil pipe 12.

[0028] Step 2: Pressurize and seal. Open the pressure source 21 and pressurize the packer 31 and the packer-producer 32 in the corresponding horizontal well segment in sequence. At this time, the corresponding horizontal well segment is sealed.

[0029] Step 3: Water content detection: the oil well pump 14 keeps pumping oil and measures the change in the water content of the oil. If the water content decreases, the closed section is a water-producing section. If the water content increases, the section is normal. Each small section of the horizontal well is closed and tested in turn.

[0030] Step 4: Close and control water. While detecting the outlet section, keep the section in a pressurized and closed state, and cancel the closure of other normal sections, so as to control the water in the outlet section.

[0031] The working principle and beneficial technical effects of the above technical solution are as follows: when making judgments and controlling water, the horizontal well is first divided into multiple small sections by cooperating with the packer 31 and the packer and production device 32, and then the packer 31 and the packer and production device 32 in each small section are pressurized and sealed in turn. When the small section is pressurized and sealed, the oil pump 14 continues to pump oil and detects the water content of the oil. If the water content of the oil decreases, it proves that the small section is a water-producing section. If the water content increases, the section is a normal section. By pressurizing and testing each small section in turn, the position of each water-producing section can be detected, and the water-producing section is kept pressurized. The water-producing small section is closed by cooperating with the packer 31 and the packer and production device 32 to achieve water control.

[0032] In one embodiment, Figure 1 As shown, it includes an oil production component 1, a pressurizing component 2 and multiple groups of separation components 3, the oil production component 1 includes a casing 11 and an oil pipe 12, an oil-casing annulus 13 is formed in the casing 11, the oil pipe 12 is arranged in the casing 11 and a pumping pump 14 is connected to the oil pipe 12; each group of the separation components 3 includes a packer 31 and a packer-producer 32, the packer 31 and the packer-producer 32 are arranged in the oil-casing annulus 13 for separating the horizontal well into multiple small sections; the pressurizing component 2 includes a pressure source 21, a pressure pipe 22 and a control valve 23, the pressure source 21 is connected to the packer 31 and the packer-producer 32 through the pressure pipe 22 and the oil-casing annulus 13.

[0033] The working principle and beneficial technical effects of the above technical solution are as follows: when making judgments and controlling water, the oil production component 1 draws oil upward through the oil pipe 12, the packer 31 and the packer production device 32 cooperate to pressurize and seal, the pressure source 21 pressurizes and seals the packer 31 through the pressure pipe 22, and the control of the pressurization process can be achieved through the control valve 23.

[0034] In one embodiment, a Christmas tree 15 is further included. The Christmas tree 15 is disposed at the wellhead of the oil well and is connected to the oil pipe 12 and the casing 11 respectively.

[0035] In step one, the pressure source 21 includes a booster pump 24 and a filter module 4 . The booster pump 24 is connected to the pressure guiding pipe 22 , and the filter module 4 is connected to the inlet of the booster pump 24 .

[0036] The working principle and beneficial technical effects of the above technical solution are as follows: by setting up the filtering module 4, the liquid is filtered before entering the booster pump 24, so as to avoid the blockage of the pressure pipe 22 or the booster pump 24 due to excessive impurities in the liquid, which affects the use.

[0037] In one embodiment, Figure 2 and Figure 3 As shown, the packer 31 includes: a connector 33, a pressure tube 34, an expansion tube 35, a rubber tube seat 36 and a center shaft 37. Two rubber tube seats 36 are respectively provided at both ends of the expansion tube 35. A connector 33 is provided at the end of the rubber tube seat 36 away from the expansion tube 35. The center shaft 37 is provided in the center part of the device for support. The pressure tube 34 is connected to the expansion tube 35 for controlling the expansion tube 35 to pressurize, seal and unseal.

[0038] The working principle and beneficial technical effects of the above technical solution: When identifying and controlling water, when the packer 31 is used, the end of the rubber tube seat 36 is connected to the connector 33 through a threaded connection, and the expansion tube 35 is connected through the pressure pipe 34 to pressurize and seal the expansion tube 35. Through the setting of the above structure, compared with the traditional method of pressurizing and depressurizing the oil pipe 12, it is possible to achieve separate sealing and unsealing of a single packer 31, thereby achieving separate testing and sealing of each small section of the horizontal well.

[0039] In one embodiment, Figure 4 As shown, the filtering module 4 includes:

[0040] The filter box 401 is configured as a cylindrical structure, and a water inlet 402 is provided at one end of the filter box 401. A flange connection block 403 is provided at the water inlet 402. A water outlet 404 is provided on the side wall of the filter box 401;

[0041] A filter sleeve 405 is disposed within the filter box 401. The filter sleeve 405 is coaxially arranged with the filter box 401, and both ends of the filter sleeve 405 abut against the end walls of the filter box 401. The water inlet 402 is connected to the filter sleeve 405. The sidewall of the filter sleeve 405 is provided with a filter screen structure, and an intermediate cavity 406 is formed between the filter box 401 and the filter sleeve 405.

[0042] A filter main shaft 407 is disposed within the filter sleeve 405. The filter main shaft 407 is coaxially arranged with the filter sleeve 405 and is slidably connected to the filter sleeve 405 along the axial direction. The outer wall of the filter main shaft 407 is in contact with the inner wall of the filter sleeve 405. The front end of the filter main shaft 407 is provided with threaded teeth.

[0043] A drive motor 408 is provided on the outer wall of the filter box 401. The output shaft of the drive motor 408 is parallel to the filter main shaft 407. A drive gear 409 is provided on the output shaft of the drive motor 408. A drive sleeve 410 is provided on the filter main shaft 407. The drive sleeve 410 is rotatably connected to the outer wall of the filter box 401. The drive sleeve 410 is slidably connected to the filter main shaft 407 and can drive the filter main shaft 407 to rotate. A driven gear 411 is sleeved on the drive sleeve 410, and the driven gear 411 is meshed with the drive gear 409:

[0044] The filtering module 4 also includes:

[0045] A filter push plate 412 is provided at the end of the filter main shaft 407 , and the filter push plate 412 is perpendicular to the filter main shaft 407 ;

[0046] A first axial sleeve 413 is provided at one end of the filter push plate 412 close to the drive motor 408. The first axial sleeve 413 is coaxially arranged with the output shaft of the drive motor 408. A triangular groove is provided at one end of the first axial sleeve 413 close to the drive motor 408.

[0047] A second axial sleeve 414 is provided at one end of the driving gear 409 close to the filter push plate 412. The second axial sleeve 414 is coaxially arranged with the first axial sleeve 413, and a triangular-shaped protrusion is provided at one end of the second axial sleeve 414 close to the first axial sleeve 413.

[0048] A partition plate 415 is provided on one side of the intermediate cavity 406 near the drive motor 408. The partition plate 415 is configured as a filter plate structure. A filter cavity 416 is formed between the partition plate 415 and the end wall of the filter box 401. The filter cavity 416 is connected to the filter sleeve 405 through a through groove.

[0049] A guide shaft 417 is further provided in the first axial sleeve 413 , one end of the guide shaft 417 is inserted into the second axial sleeve 414 and is slidably connected to the second axial sleeve 414 ;

[0050] A tension spring 418 is provided between the driving sleeve 410 and the filter push plate 412 , and the tension spring 418 is coaxially arranged with the filter main shaft 407 .

[0051] The working principle and beneficial technical effects of the above technical solution are as follows: when the filter module 4 is in use, the liquid enters the filter sleeve 405 from the water inlet 402, then enters the intermediate cavity 406 through the side wall filter screen of the filter sleeve 405, and then is discharged from the water outlet 404 on the side wall of the filter box 401. In this process, the impurities contained in the liquid are filtered out in the filter sleeve 405, and at the same time, the driving motor 408 is started to drive the driving gear 409 to rotate, and the meshing of the driving gear 409 and the driven gear 411 drives the driven gear 411 and the driving sleeve 410 to rotate, thereby driving the filter main shaft 407 to rotate. At the same time, when the driving gear 409 rotates, it drives the second axial sleeve 414 to rotate, and through the second axial sleeve 41 The cooperation between the upper protrusion 414 and the groove on the first axial sleeve 413 drives the first axial sleeve 413 to move axially, and the provision of the tension spring 418 enables the first axial sleeve 413 to realize axial reciprocating motion, thereby driving the filter main shaft 407 to realize axial reciprocating motion while rotating. Since the front end of the filter main shaft 407 is provided with threaded teeth, when the filter main shaft 407 reciprocates, the threaded teeth scrape impurities in the filter sleeve 405. At the same time, when the filter main shaft 407 rotates, the threaded teeth act like a screw feeder, thereby driving the movement of impurities. Finally, the impurities fall into the filter cavity 416 through the through groove for collection, thereby preventing the impurities from accumulating in the filter sleeve 405 and blocking the filter screen, affecting the subsequent filtering effect.

[0052] In one embodiment, Figure 5 and Figure 6 As shown, a discharge assembly 5 is further provided in the filter cavity 416, and the discharge assembly 5 includes:

[0053] A closing plate 51 is provided. Two discharge ports 52 are symmetrically provided on both side walls of the filter chamber 416. A closing plate 51 is slidably provided at the discharge port 52. The closing plate 51 is provided in an arc-shaped structure and fits in contact with the inner wall of the filter chamber 416. The closing plate 51 is slidably connected to the inner wall of the filter chamber 416.

[0054] A scraper 54 is provided at the bottom of the filter chamber 416 . The scraper 54 is radially arranged along the filter box 401 , and the end of the scraper 54 abuts against the inner wall of the filter box 401 .

[0055] The closing plate 51 and the scraper 54 are connected by a connecting bar 55 . The connecting bar 55 is configured as an arc-shaped structure and abuts against the inner wall of the filter box 401 .

[0056] The working principle and beneficial technical effects of the above technical solution are as follows: when the discharge component 5 is in use, impurities enter the filter chamber 416 and sink to the bottom wall of the filter chamber 416. When the impurities in the filter chamber 416 need to be cleaned, the shift block 53 is pushed to drive the closing plate 51 to slide along the inner wall of the filter chamber 416. While the closing plate 51 slides to open the discharge port 52, the scraper 54 moves along the inner wall of the filter chamber 416 driven by the closing plate 51, and scrapes the impurities remaining in the filter chamber 416 to the discharge port 52, completing the cleaning of the inside of the filter chamber 416. At the same time, the two scrapers 54 are set to a magnetic material. When the closing plate 51 is closed, the two scrapers 54 are adsorbed and fixed to each other. In daily use, a sealing strip can also be set on the edge of the closing plate 51 to further enhance the sealing performance.

[0057] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A method for quickly identifying and controlling the water outlet position of a horizontal well, characterized in that: The following steps are involved: Step 1: regional division, in the horizontal well section, the horizontal well section is divided into multiple small sections by using a packer (31) and a packer-production device (32) in combination, and the packer (31) and the packer-production device (32) are connected to the pressure source (21) through the oil pipe (12); Step 2: Pressurize and seal, open the pressure source (21), and pressurize the packer (31) and the packer and production device (32) in the corresponding horizontal well section in sequence, and the corresponding horizontal well section is now sealed; Step 3: Water content detection, the oil well pump (14) keeps pumping oil and measures the change of the oil water content. If the water content decreases, the closed section is a water-producing section, otherwise the section is normal. Each small section of the horizontal well is closed and tested in turn; Step 4: Close and control water. When the outlet section is detected, keep the section in a pressurized and closed state, and cancel the closure of other normal sections, so as to control the water supply of the outlet section. In step 1, the pressure source (21) is connected to the packers (31) and the packer production device (32) in each small section through a plurality of pressure pipes (22), and the pressure pipes (22) are all connected to a control valve (23); The invention also includes an oil production component (1), a pressurizing component (2) and multiple groups of separation components (3). The oil production component (1) includes a casing (11) and an oil pipe (12). An oil casing annulus (13) is formed in the casing (11). The oil pipe (12) is arranged in the casing (11) and a pumping pump (14) is connected to the oil pipe (12). Each group of the separation components (3) includes a packer (31) and a packer production device (32). The packer (31) and the packer production device (32) are arranged in the oil casing annulus (13) and are used to separate the horizontal well into multiple small sections. The pressurizing component (2) includes a pressure source (21), a pressure guide pipe (22) and a control valve (23). The pressure source (21) is connected to the packer (31) and the packer production device (32) through the pressure guide pipe (22) and the oil casing annulus (13).

2. A method for quickly identifying and controlling water output from a horizontal well according to claim 1, characterized in that: The invention also includes a Christmas tree (15), which is arranged at the wellhead of the oil well and is respectively connected with the oil pipe (12) and the casing (11).

3. A method for quickly identifying and controlling water output position of a horizontal well according to claim 1, characterized in that: The packer (31) includes: a connector (33), a pressure pipe (34), an expansion cylinder (35), a rubber cylinder seat (36) and a central shaft (37). Two rubber cylinder seats (36) are respectively provided at both ends of the expansion cylinder (35). The end of the rubber cylinder seat (36) away from the expansion cylinder (35) is provided with a connector (33). The central shaft (37) is provided in the central part of the device for support. The pressure pipe (34) is connected to the expansion cylinder (35) to control the expansion cylinder (35) to pressurize and seal and release.

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