Horizontal well water control oil extraction device

Abstract

The utility model discloses a water control and oil extraction device for a horizontal well, which relates to the technical field of oil field machinery and comprises a process pipe column for dividing a packing well section and a production well section in a casing pipe, and a suction component which is arranged on the wellhead side of the casing pipe and is used for sucking media in the production well section, the process pipe column comprises a fourth oil pipe, a second packer and a fourth packer, the second packer is connected to the outlet end of the fourth oil pipe, and the fourth packer is connected to the inlet end of the fourth oil pipe; the third packer is arranged at the inlet end of the fourth oil pipe and located between the second packer and the fourth packer, the third packer is provided with a rubber sleeve used for packing an annular space between the third packer and the casing pipe, and the rubber sleeve of the third packer is a dissoluble rubber sleeve; the process pipe column and the suction assembly are of mutually independent structures. According to the scheme, the problem that the production plan of the horizontal well is affected due to the fact that the packer cannot be removed after being set at the wrong position can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field machinery, in particular to a horizontal well water control oil production device. Background Art

[0002] A horizontal well refers to a wellbore trajectory that enters the oil layer at a horizontal angle or a nearly horizontal angle, and maintains a long well section and completion depth in the oil layer. The characteristics of a horizontal well include long contact with the oil layer, large oil leakage area, low production pressure, high production, etc. It also has the advantages of a short investment payback period and good economic benefits. Horizontal wells can be used not only for conventional oil and gas reservoirs, but also for bottom water reservoirs, thin layer reservoirs and low permeability reservoirs. With the large-scale application of horizontal well development in oil fields, the problem of high water content or water-flooded reservoirs in horizontal wells has increasingly become a problem restricting the development of oil fields.

[0003] Compared with vertical wells and directional wells, horizontal wells are more prone to water flooding during oil production due to their wellbore structure. The main forms of water flooding are bottom water cone intrusion and fracture intrusion. In practice, water outflow from horizontal wells is extremely harmful to production, and it is usually impossible to effectively determine the exact water outflow location (the conventional water-finding instruments currently used have large errors in water-finding, and the error between the data interpreted by the instruments and the actual data is significant), so it is difficult to plug the water in time. In this case, the oil production of the oil well will be greatly reduced, and the burden of surface water treatment will be increased, the efficiency of artificial lifting will be reduced, and the corrosion and scaling of equipment and pipelines will be aggravated. If the produced water is not reinjected or treated in time, it will also increase the pollution to the environment.

[0004] Especially in the later stages of oilfield development, the problem of horizontal well water injection ridges may become very prominent. To solve this problem, it is necessary to adopt relevant horizontal well water control devices and horizontal well water control oil production processes to meet the current needs of reasonable oilfield production (relevant prior art includes disclosed patent technologies, for example, the principles of the solutions provided by application numbers CN201320360826.X, CN202010042462.5, and CN201920077535.7). When the existing technical solutions based on water-finding instruments are implemented, there are certain hidden dangers in the use of conventional horizontal well water-finding tools: wax and sand production in horizontal wells leads to obstruction and jamming when used in the horizontal section of the tubing, and even a major overhaul is required to remove the water-finding tool, which not only increases the cost of well repair, but also makes the construction difficult, time-consuming and labor-intensive. More seriously, it may cause the horizontal wellbore to be unusable.

[0005] In the process of horizontal well oil production, water control operation when necessary is an important measure to ensure the normal production of the oil field. Therefore, optimizing the horizontal well water control oil production technology is of great significance to oil field production. Utility Model Content

[0006] In view of the above-mentioned problem of optimizing the horizontal well water control oil production technology, the utility model provides a horizontal well water control oil production device. The structure provided by the scheme adopts a packer to obtain an isolated well section in a horizontal well, and in the process of determining the isolated well section, it can effectively avoid the problem that the packer cannot be removed after being set in the wrong position, affecting the horizontal well production plan.

[0007] In view of the above problems, the utility model provides a horizontal well water control oil production device to solve the problems through the following technical points: a horizontal well water control oil production device, including a process pipe string for dividing an isolation well section and a production well section in a casing, and also including a suction assembly for being arranged on the wellhead side of the casing and sucking the medium in the production well section, the process pipe string includes a fourth oil pipe, a second packer and a fourth packer, the second packer is connected to the outlet end of the fourth oil pipe, and the fourth packer is connected to the inlet end of the fourth oil pipe;

[0008] It also includes a third packer arranged at the inlet end of the fourth oil pipe and located between the second packer and the fourth packer, wherein the third packer has a rubber sleeve for sealing the annular space between the third packer and the casing, and the rubber sleeve of the third packer is a soluble rubber sleeve;

[0009] The process pipe column and the suction assembly are independent structures.

[0010] The specific use of this scheme is as follows: the process pipe string is lowered into the well to effectively divide the leakage points or water-producing sections in the well section to obtain the isolation well section and the production well section, so as to slow down and control the speed of the water cone entering the oil reservoir or stop the cone from entering. For example, the process pipe string is provided with one end of the fourth packer as the front end of the process pipe string and is inserted into the casing. When the fourth packer seals the annular space between it and the casing, and the second packer seals the annular space between it and the casing, the space between the fourth packer and the second packer on the casing is the isolation well section, and the space at the front end of the fourth packer on the casing is the production well section. By arranging the suction assembly in the casing between the wellhead and the second packer, the medium in the production well section can pass through the process pipe string with the front end of the fourth packer on the process pipe string as the inlet and the rear end of the second packer as the outlet, and is discharged to the outside of the casing by the suction assembly to achieve oil production.

[0011] According to the use characteristics of the process string, the fourth packer on it needs to be placed in a deeper position of the horizontal well. When the water outlet position is not judged accurately, the isolation position of the fourth packer will be inaccurate. Possible situations include: First, since the fourth packer needs to withstand a higher pressure, the limiting structures such as the cava on the fourth packer will cause certain damage to the casing. In order to adjust the position of the fourth packer, multiple unsealing and sealing of the fourth packer will form multiple indentations on the inner wall of the casing. The defects on the inner wall of the casing have an adverse effect on the life and reliability of the casing; after the fourth packer is sealed, since it is located in a deeper position in the horizontal well, it is troublesome to unseal it, and there is even a risk of not being able to unseal it normally. If the internal shape of the horizontal well section is restored through overhaul, it will not only disrupt the production plan of the horizontal well in time, but also there is a problem of high recovery cost.

[0012] The difference between the present solution and the prior art is that: it also includes a third packer arranged on the process string, located at the inlet end of the fourth oil pipe and behind the fourth packer. Before the fourth packer is set, the third packer is used as a temporary packer to seal the annular space between the third packer and the casing. For the production well section between the third packer and the artificial well bottom, if the medium discharged from the rear end of the process string after the third packer is set meets the sealing requirements, the fourth packer is further set at this time, and the front end of the isolated well section can be separated from the fourth packer by the fourth packer. The rear end of the production well section is sealed for a long time; if the medium discharged from the rear end of the process string after the third packer is sealed does not meet the sealing requirements, the third packer needs to be pushed forward further. At this time, it can be normally unsealed according to the sealing form adopted by the third packer. If it cannot be unsealed normally due to the position and other reasons, since the third packer adopts a soluble rubber cartridge, it can be unsealed after waiting for the rubber cartridge on the third packer to self-dissolve to a certain extent, and then the process string can be taken out from the casing, and the rubber cartridge on the third packer can be replaced. The original depth of the horizontal well is used as a reference, and the sealing position of the third packer is adjusted to a position closer to the bottom of the artificial well and sealed. When the liquid discharge at the rear end of the second packer meets the sealing requirements, the fourth packer and the second packer are sealed to obtain a permanent isolation section in the horizontal well, and a suction assembly is placed at the rear end of the isolation section to carry out horizontal well oil production. At the same time, since the third packer is a temporary packer, in terms of pressure bearing, the oil pipe connected to the second packer and extended to the wellhead can bear part or all of the force. Of course, during the installation When installing the process string, the process string can be installed as a whole at the front end of the oil pipe and placed in the position where sealing is required. Alternatively, after the front end structure including the third packer and the fourth packer is installed using the oil pipe (for example, a fourth packer that requires a sealing tool to achieve sealing is used), it can be determined whether the sealing position of the third packer is appropriate based on the quality of the liquid discharged from the oil pipe, and after the position of the third packer is adjusted to a suitable position, the fourth oil pipe and the second packer can be further installed. Technical personnel in this field can also use other suitable processes to complete the installation of the process string. In summary, this solution provides a technical solution that uses the third packer for temporary sealing during the positioning of the process string to determine whether the fourth packer is in a suitable position. When the third packer cannot be unsealed normally, the self-dissolving characteristics of the rubber tube on it are used to avoid the situation in which the packer located at a deeper position in the horizontal well cannot be unsealed during the installation of the process string and requires a complex unsealing process (such as drilling and milling) to restore the inner hole of the casing. After the process string is installed, the second and fourth packers can be used to effectively isolate the water-producing well section, and the suction assembly can be used to suck the production well section, thereby effectively reducing the water content of the oil and increasing the production and recovery rate of the horizontal well. This solution is particularly suitable for sealing and producing thin oil wells.

[0013] The difference between the present solution and the prior art lies in that: the process tubing and the suction assembly are independent structures. When the present oil production device is in use, the suction assembly is installed in the casing and is located behind the second packer, and has an installation interval with the second packer. For example, when working, the suction assembly obtains a hanging point at the wellhead position and is installed in a free hanging state to avoid external force deformation that may occur due to the integral structure formed by interconnection with the process tubing, improve the stress conditions of the sucker rod (the first oil pipe marked in the accompanying drawings) and the oil pipe (the fourth oil pipe marked in the accompanying drawings), and ensure the sealing effect of each packer and the reliability and efficiency of the bridge pump on the suction assembly by improving the deformation. This type of suction assembly is particularly suitable for deep well mining.

[0014] As described above, the third packer is configured to have a self-dissolving gel tube to solve the subsequent processing problem caused by the packer not being able to be unsealed normally during the process of setting the process string. In the entire use cycle of the horizontal well, there are operations such as well repairing the horizontal well in the later stage, and there are operations such as adjusting the installation position of the process string. Therefore, for the second packer and the fourth packer that have been used for a long time, when the process string needs to be removed, if these two packers cannot be unsealed normally or the unsealing is difficult, it will inevitably affect the efficiency, difficulty and cost of the relevant operations. In this case, in a specific embodiment, the second packer and the fourth packer are both drillable packers. In this solution, the relevant setting limit mechanism on each of the second packer and the fourth packer can be set to a composite material (such as slips). When these packers cannot be unsealed normally, the drilling and milling process is used to efficiently complete the drilling and milling to achieve the unsealing operation of these packers.

[0015] As described above, during the use of the third packer, the requirement for the anchoring force of the third packer can be reduced by using the method of bearing the pressure of the tubing. In this case, in order to ensure the coaxiality of the third packer and the casing, to facilitate the setting of the third packer and to ensure the setting effect of the third packer, in a specific embodiment, a centralizer fixed on the fourth tubing and located at the end of the third packer is also included. In this solution, the centralizer is used to maintain the position of the third packer in the radial direction of the casing.

[0016] In a specific embodiment, the front end of the second packer is connected to the outlet end of the fourth oil pipe, and the rear end of the fourth packer is connected to the inlet end of the fourth oil pipe;

[0017] The third packer is connected in series to the fourth oil pipe. This solution is: the lower end of the second packer is connected to the upper end of the fourth oil pipe, the upper end of the fourth packer is connected to the lower end of the fourth oil pipe, and the third packer is connected in series to the lower end of the fourth oil pipe. As a person skilled in the art, in this solution, the third packer and the second packer are both located at the rear end of the fourth packer, so the setting of the fourth packer should not be affected by the second packer and the third packer at the rear. At this time, the fourth packer can be an electric setting packer, a partial hydraulic setting packer, etc. Similarly, if there is a second packer behind the third packer when setting, the second packer should not affect the operation needs of the third packer. For example, the third packer is an electric setting packer or a hydraulic setting packer. Of course, the third packer and the fourth packer can be set first, and then the fourth oil pipe and the second packer are further connected, so the third packer can be set using a setting tool on the third packer.

[0018] In a specific embodiment, the front end of the second packer is connected to the outlet end of the fourth oil pipe, and the rear end of the fourth packer is connected to the inlet end of the fourth oil pipe;

[0019] The rubber cylinder of the third packer is arranged on the fourth packer: the fourth packer includes an outer shell, the rubber cylinder of the third packer is arranged at the rear end of the outer shell, and the rubber cylinder of the third packer is located behind the rubber cylinder of the fourth packer. This scheme is a parallel scheme of the above implementation mode, specifically: from the perspective of pressure bearing, the fourth packer preferably adopts a hydraulic setting packer that requires a setting tool to achieve setting, so its setting needs to be connected to a setting tool at the upper end to complete the setting operation, and the setting of the fourth packer is located after the setting of the third packer, so it is necessary to avoid the third packer affecting the placement and setting operation of the fourth packer. In this case, the rubber cylinder of the third packer is arranged at the rear end of the outer shell of the fourth packer, that is, the third packer is not used as a connecting structure of the front end of the fourth packer, which can avoid the third packer affecting the placement and setting operation of the fourth packer. Regarding the limitation of the above rubber cylinder position, it is intended to limit the setting position of the fourth packer to be located in front of the setting position of the third packer.

[0020] In a specific embodiment, the suction assembly includes a first oil pipe, a bridge pump connected to the inlet end of the first oil pipe, a second oil pipe with one end connected to the inlet end of the bridge pump, a first perforated pipe with one end connected to the other end of the second oil pipe, and a check valve with an outlet end connected to the other end of the first perforated pipe;

[0021] The first perforated pipe is a pipe with through holes provided on the side wall;

[0022] It also includes a first packer, and the first perforated pipe is connected to the check valve through the first packer. When this embodiment is used, the installation position of the bridge pump is set to be below the liquid level in the well, the first oil pipe serves as a sucker rod, the bridge pump serves as a power device for completing oil pumping, the second oil pipe serves as a straight pipe at the front end of the bridge pump, the first perforated pipe serves as a pipeline at the front end of the second oil pipe, the check valve serves as a pipe fitting at the front end of the first perforated pipe, and the packer serves as a packer below the through hole on the first perforated pipe and above the inlet of the check valve. In this way, when pumping oil normally, the liquid from the upper end of the second packer enters the first perforated pipe through the check valve, then enters the bridge pump through the second oil pipe, and then is pumped out of the casing through the first oil pipe; when washing the well, the washing fluid from the wellhead can enter the first perforated pipe through the channel on the first perforated pipe, and then be discharged through the second oil pipe, the bridge pump and the first oil pipe. Therefore, in this scheme, a suction assembly is provided that can facilitate well washing. Furthermore, the one-way valve and the first packer can prevent the well washing fluid from continuing to flow downward. Furthermore, the first packer can be used to receive objects that fall from the wellhead to prevent these objects from further falling to the lower side of the horizontal well. Furthermore, the straight pipe section formed by the second oil pipe at the inlet end of the bridge pump can optimize the flow state at the inlet end of the bridge pump.

[0023] In a specific embodiment, the inlet end of the check valve is further connected to a second perforated pipe, and the second perforated pipe is a pipe with through holes provided on the side wall;

[0024] One end of the second perforated pipe is connected to the check valve, and the other end of the second perforated pipe is also connected to the third oil pipe. One end of the third oil pipe is connected to the second perforated pipe, and the other end of the third oil pipe is a blind end. This scheme is: on the basis of the above scheme, a second perforated pipe and a third oil pipe are connected to the front end of the check valve in sequence, so that the inlet for the fluid to enter the suction assembly is the channel on the second perforated pipe, and these channels can cause the agglomerated materials in the fluid to be broken under the shearing action of the channel hole wall, so that the fluid composition sucked by the bridge pump is more uniform; further, the third oil pipe below the second perforated pipe can be used to deposit the sediment entering the suction assembly; further, when the bridge pump needs to be inspected, the first oil pipe needs to be lifted to remove the suction assembly from the casing. At this time, the check valve will cause a large amount of medium to remain in the suction assembly, and finally these media will be taken out to the outside of the casing. After these media overflow, they cause environmental pollution and increase related processing work. The better application is to knock off the ball seat on the check valve from the upper end of the first oil pipe, so that these media can flow out from the through hole on the third oil pipe. Therefore, the third oil pipe with a blind end at the lower end can be used to receive the ball seat to prevent the ball seat from falling into the horizontal well.

[0025] In a specific embodiment, the other end of the third oil pipe is detachably connected to a plug, and the plug serves as a plugging structure for forming the blind end. This embodiment is a technical solution for obtaining the blind end conveniently and taking out the ball seat conveniently.

[0026] In a specific embodiment, in order to obtain a reliable setting effect, the fourth packer is a Y453 type packer, and the second packer is a Y455 type packer.

[0027] Since the setting reliability requirement for the first packer is not high, the first packer can adopt the Z331 packer.

[0028] The utility model has the following beneficial effects:

[0029] The present invention provides a technical solution for temporarily sealing the third packer during the positioning of the process string to determine whether the position of the fourth packer is appropriate. When the third packer cannot be unsealed normally, the self-dissolving characteristics of the rubber tube on it are utilized to avoid the situation in which the packer located at a deeper position in the horizontal well cannot be unsealed during the installation of the process string and requires a complex unsealing process (such as drilling and milling) to restore the inner hole of the casing. After the installation of the process string is completed, the second and fourth packers can be used to effectively isolate the water-producing well section, and the suction assembly can be used to suck the production well section, thereby effectively reducing the water content of the oil and increasing the production and recovery rate of the horizontal well.

[0030] The process tubing and the suction assembly are independent structures, which can avoid the external force deformation that may occur when the process tubing is connected to form an integral structure, improve the stress condition of the sucker rod and the oil pipe, and ensure the sealing effect of each packer and the reliability and efficiency of the bridge pump on the suction assembly by improving the deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the installation state of a specific application embodiment of a horizontal well water control oil production device described in this scheme;

[0032] Figure 2 This is a schematic diagram of the installation state of a specific application embodiment of a horizontal well water control oil production device described in this scheme;

[0033] Figure 1 and Figure 2 All of them are multi-stage fractured horizontal wells. Figure 1 and Figure 2 The difference is: Figure 1 The third packer is a separator independent of the fourth packer. Figure 2 The third packer is a packer whose rubber tube is installed on the outer shell of the fourth packer.

[0034] The reference numerals in the figure are respectively: 1, first oil pipe, 2, bridge pump, 3, second oil pipe, 4, casing, 5, first perforated pipe, 6, first packer, 7, check valve, 8, second perforated pipe, 9, third oil pipe, 10, plug, 11, second packer, 12, horizontal well section, 13, packer well section, 14, centralizer, 15, third packer, 16, fourth packer, 17, production well section, 18, fourth oil pipe, 19, artificial bottom well. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the embodiments, but the present invention is not limited to the following embodiments:

[0036] Embodiment 1:

[0037] like Figure 1 and Figure 2 As shown, a horizontal well water control oil production device includes a process string for dividing an isolation well section 13 and a production well section 17 in a casing 4, and also includes a suction assembly for being arranged at the wellhead side of the casing 4 and sucking the medium in the production well section 17. The process string includes a fourth oil pipe 18, a second packer 11 and a fourth packer 16. The second packer 11 is connected to the outlet end of the fourth oil pipe 18, and the fourth packer 16 is connected to the inlet end of the fourth oil pipe 18.

[0038] It also includes a third packer 15 disposed at the inlet end of the fourth oil pipe 18 and located between the second packer 11 and the fourth packer 16, wherein the third packer 15 has a rubber sleeve for sealing the annular space between the third packer 15 and the casing 4, and the rubber sleeve of the third packer 15 is a soluble rubber sleeve;

[0039] The process pipe column and the suction assembly are independent structures.

[0040] The specific use of this scheme is as follows: the process string is lowered into the well to effectively divide the leakage points or water-producing sections in the well section to obtain the isolation well section 13 and the production well section 17, so as to slow down and control the speed of the water cone entering the oil reservoir or stop the cone from entering. For example, the process string is provided with one end of the fourth packer 16 as the front end of the process string and is placed in the casing 4. When the fourth packer 16 isolates the annular space between it and the casing 4, and the second packer 11 isolates the annular space between it and the casing 4, After the space is formed, the space between the fourth packer 16 and the second packer 11 on the casing 4 is the isolation well section 13, and the space at the front end of the fourth packer 16 on the casing 4 is the production well section 17. By arranging the suction component in the casing 4 between the wellhead and the second packer 11, the medium in the production well section 17 can pass through the process pipe string with the front end of the fourth packer 16 on the process pipe string as the inlet and the rear end of the second packer 11 as the outlet, and be discharged to the outside of the casing 4 by the suction component to realize oil production.

[0041] According to the use characteristics of the process tubing, the fourth packer 16 on it needs to be placed at a deeper position in the horizontal well. When the water outlet position is not judged accurately, the isolation position of the fourth packer 16 will be inaccurate. Possible situations include: First, since the fourth packer 16 needs to withstand a higher pressure, the limiting structures such as the cava on the fourth packer 16 will cause certain damage to the casing 4. In order to adjust the position of the fourth packer 16, multiple unsealing and sealing of the fourth packer 16 will form multiple indentations on the inner wall of the casing 4. The defects on the inner wall of the casing 4 have an adverse effect on the life and reliability of the casing 4; after the fourth packer 16 is sealed, since it is located at a deeper position in the horizontal well, it is troublesome to unseal it, and there is even a risk of not being able to unseal it normally. If the internal shape of the horizontal well section 12 is restored through overhaul, not only will the production plan of the horizontal well be disrupted in time, but there is also a problem of high recovery costs.

[0042] The present invention is different from the prior art in that it also includes a third packer 15 arranged on the process string, located at the inlet end of the fourth oil pipe 18 and behind the fourth packer 16. Before the fourth packer 16 is set, the third packer 15 is used as a temporary packer to seal the annular space between the third packer 15 and the casing 4. For the production well section 17 located between the third packer 15 and the artificial well bottom 19, if the medium discharged from the rear end of the process string after the third packer 15 is set meets the sealing requirements, the fourth packer 16 is further set at this time, and the fourth packer 16 can be used to seal the well section 17. The front end of the well section 13 and the rear end of the production well section 17 are sealed for a long time; if the medium discharged from the rear end of the process pipe string after the third packer 15 is sealed does not meet the sealing requirements, the third packer 15 needs to be further pushed forward. At this time, it can be normally unsealed according to the sealing form adopted by the third packer 15. If it cannot be unsealed normally due to position reasons or other reasons, since the third packer 15 adopts a soluble rubber cartridge, it can be unsealed after waiting for the rubber cartridge on the third packer 15 to self-dissolve to a certain extent, and then the process pipe string is taken out from the casing 4, and the rubber cartridge on the third packer 15 is unsealed. After replacement, taking the original depth of the horizontal well as a reference, the sealing position of the third packer 15 is adjusted to a position closer to the artificial well bottom 19 and sealed. When the liquid discharge at the rear end of the second packer 11 meets the sealing requirements, the fourth packer 16 and the second packer 11 are sealed to obtain a permanent isolation well section 13 in the horizontal well, and a suction assembly is placed at the rear end of the isolation well section 13 to carry out horizontal well oil production. At the same time, since the third packer 15 is a temporary packer, in terms of pressure bearing, the oil pipe connected to the second packer 11 and extending to the wellhead can be used to bear part or all of the force. Of course, when installing the process tubing, the process tubing can be installed as a whole at the front end of the oil pipe and placed in the position where sealing is required, or after the front end structure including the third packer 15 and the fourth packer 16 is installed using the oil pipe (for example, the fourth packer 16 that requires a sealing tool to achieve sealing is used), it is determined whether the sealing position of the third packer 15 is appropriate based on the quality of the liquid discharged from the oil pipe, and after the position of the third packer 15 is adjusted to a suitable position, the fourth oil pipe 18 and the second packer 11 are further installed. Technical personnel in this field can also use other suitable processes to complete the installation of the process tubing.In summary, this solution provides a technical solution for temporarily sealing the third packer 15 to determine whether the position of the fourth packer 16 is appropriate during the positioning of the process string, and when the third packer 15 cannot be unsealed normally, the self-dissolving characteristics of the rubber tube on it are used to avoid the situation in which the packer located at a deeper position in the horizontal well cannot be unsealed during the installation of the process string and requires a complex unsealing process (such as drilling and milling) to restore the inner hole of the casing 4. After the process string is installed, the second and fourth packers 16 can be used to effectively isolate the water-producing well section, and the suction assembly can be used to suck the production well section 17, thereby effectively reducing the water content of the oil and improving the production and recovery rate of the horizontal well. This solution is particularly suitable for sealing and producing thin oil wells.

[0043] The difference between the present scheme and the prior art is that the process tubing and the suction assembly are independent structures. When the present oil production device is in use, the suction assembly is installed in the casing 4 and is located behind the second packer 11, and has an installation interval with the second packer 11. For example, when working, the suction assembly obtains a hanging point at the wellhead position and is installed in a free hanging state to avoid external force deformation that may occur due to the integral structure connected with the process tubing, improve the stress conditions of the sucker rod (the first oil pipe 1 marked in the accompanying drawings) and the oil pipe (the fourth oil pipe 18 marked in the accompanying drawings), and ensure the sealing effect of each packer and the reliability and efficiency of the bridge pump 2 on the suction assembly by improving the deformation. This type of suction assembly is particularly suitable for deep well mining.

[0044] As described above, the third packer 15 is configured to have a self-dissolving gel tube to solve the subsequent processing problem caused by the packer not being able to be unsealed normally during the process of setting the process string. In the entire use cycle of the horizontal well, there are operations such as well repairing the horizontal well in the later stage, and there are operations such as adjusting the installation position of the process string. Therefore, for the second packer 11 and the fourth packer 16 that have been used for a long time, when the process string needs to be removed, if these two packers cannot be unsealed normally or the unsealing is difficult, it will inevitably affect the efficiency, difficulty and cost of the relevant operations. In this case, more specifically, the second packer 11 and the fourth packer 16 are both drillable packers. In this solution, the relevant setting limit mechanism on each of the second packer 11 and the fourth packer 16 can be set to a composite material (such as slips). When these packers cannot be unsealed normally, the drilling and milling process is used to efficiently complete the drilling and milling to achieve the unsealing operation of these packers.

[0045] As described above, during the use of the third packer 15, the requirement for the anchoring force of the third packer 15 can be reduced by using the method of bearing the pressure of the oil pipe. In this case, in order to ensure the coaxiality between the third packer 15 and the casing 4, so as to facilitate the setting of the third packer 15 and ensure the setting effect of the third packer 15, a more detailed method further includes a centralizer 14 fixed on the fourth oil pipe 18 and located at the end of the third packer 15. In this solution, the centralizer 14 is used to maintain the position of the third packer 15 in the radial direction of the casing 4.

[0046] More specifically, the front end of the second packer 11 is connected to the outlet end of the fourth oil pipe 18, and the rear end of the fourth packer 16 is connected to the inlet end of the fourth oil pipe 18;

[0047] The third packer 15 is connected in series to the fourth oil pipe 18. In this solution, the lower end of the second packer 11 is connected to the upper end of the fourth oil pipe 18, the upper end of the fourth packer 16 is connected to the lower end of the fourth oil pipe 18, and the third packer 15 is connected in series to the lower end of the fourth oil pipe 18. As a technician in this field, in this solution, the third packer 15 and the second packer 11 are both located at the rear end of the fourth packer 16, so the sealing of the fourth packer 16 should not be affected by the second packer 11 and the third packer 15 at the rear. At this time, the fourth packer 16 can adopt an electric sealing packer, a partial hydraulic sealing packer, etc. Similarly, if there is a second packer 11 behind it when the third packer 15 is sealed, the second packer 11 should not affect the operational needs of the sealing of the third packer 15. For example, the third packer 15 is an electric sealing packer or a hydraulic sealing packer. Of course, the third packer 15 and the fourth packer 16 can be sealed first, and then the fourth oil pipe 18 and the second packer 11 can be further connected. Therefore, the sealing tool can be used on the third packer 15 to complete the sealing of the third packer 15.

[0048] More specifically, the front end of the second packer 11 is connected to the outlet end of the fourth oil pipe 18, and the rear end of the fourth packer 16 is connected to the inlet end of the fourth oil pipe 18;

[0049] The rubber cylinder of the third packer 15 is arranged on the fourth packer 16 : the fourth packer 16 includes an outer shell, the rubber cylinder of the third packer 15 is arranged at the rear end of the outer shell, and the rubber cylinder of the third packer 15 is located behind the rubber cylinder of the fourth packer 16 . This scheme is a parallel scheme of the above implementation mode, specifically: from the perspective of pressure bearing, the fourth packer 16 preferably adopts a hydraulically set packer that requires a sealing tool to achieve sealing, so its sealing needs to be connected to a sealing tool at the upper end to complete the sealing operation, and the setting of the fourth packer 16 is located after the setting of the third packer 15, so it is necessary to avoid the third packer 15 affecting the placement and setting operation of the fourth packer 16. In this case, the rubber cylinder of the third packer 15 is set at the rear end of the outer shell of the fourth packer 16, that is, the third packer 15 does not serve as a connecting structure of the front end of the fourth packer 16, which can avoid the third packer 15 affecting the placement and setting operation of the fourth packer 16. The limitation on the position of the rubber cylinder above is intended to limit the setting position of the fourth packer 16 to be located in front of the setting position of the third packer 15.

[0050] More specifically, the suction assembly includes a first oil pipe 1, a bridge pump 2 connected to the inlet end of the first oil pipe 1, a second oil pipe 3 with one end connected to the inlet end of the bridge pump 2, a first perforated pipe 5 with one end connected to the other end of the second oil pipe 3, and a check valve 7 with the outlet end communicating with the other end of the first perforated pipe 5;

[0051] The first perforated pipe 5 is a pipe with through holes on the side wall;

[0052] It also includes a first packer 6, and the first perforated pipe 5 is connected to the check valve 7 through the first packer 6. When the embodiment is in use, the installation position of the bridge pump 2 is set to be below the liquid level in the well, the first oil pipe 1 is used as a sucker rod, the bridge pump 2 is used as a power device to complete the oil pumping, the second oil pipe 3 is used as a straight pipe at the front end of the bridge pump 2, the first perforated pipe 5 is used as a pipeline at the front end of the second oil pipe 3, the check valve 7 is used as a pipe fitting at the front end of the first perforated pipe 5, and the packer is used as a packer below the through hole on the first perforated pipe 5 and above the inlet of the check valve 7. In this way, when pumping oil normally, the liquid from the upper end of the second packer 11 enters the first perforated pipe 5 through the check valve 7, then enters the bridge pump 2 through the second oil pipe 3, and then is pumped out of the casing 4 through the first oil pipe 1; when washing the well, the washing fluid from the wellhead can enter the first perforated pipe 5 through the channel on the first perforated pipe 5, and then be discharged through the second oil pipe 3, the bridge pump 2 and the first oil pipe 1. Therefore, in this scheme, a suction assembly is provided that can facilitate well washing. Furthermore, the one-way valve 7 and the first packer 6 can prevent the well washing fluid from continuing to flow downward. Furthermore, the first packer 6 can be used to receive objects that fall from the wellhead to prevent these objects from further falling to the lower side of the horizontal well. Furthermore, the straight pipe section formed by the second oil pipe 3 at the inlet end of the bridge pump 2 can optimize the flow state at the inlet end of the bridge pump 2.

[0053] More specifically, the inlet end of the check valve 7 is also connected to a second perforated pipe 8, and the second perforated pipe 8 is a pipe with through holes on the side wall;

[0054] One end of the second perforated tube 8 is connected to the one-way valve 7, and the other end of the second perforated tube 8 is also connected to the third oil pipe 9. One end of the third oil pipe 9 is connected to the second perforated tube 8, and the other end of the third oil pipe 9 is a blind end. This solution is: on the basis of the above solution, the second perforated tube 8 and the third oil pipe 9 are connected to the front end of the one-way valve 7 in sequence, so that the inlet of the fluid entering the suction component is the channel on the second perforated tube 8. These channels can break up the agglomerated materials in the fluid under the shearing action of the channel hole wall, so that the fluid composition sucked by the bridge pump 2 is more uniform; further, the third oil pipe 9 below the second perforated tube 8 can be used to deposit the sediment entering the suction component; further, when the bridge pump 2 needs to be inspected , it is necessary to lift the first oil pipe 1 to remove the suction assembly from the casing 4. At this time, the check valve 7 will cause a large amount of medium to remain in the suction assembly, and finally these media will be brought out to the outside of the casing 4. After these media overflow, they will cause environmental pollution and increase related processing work. The better application is to knock off the ball seat on the check valve 7 from the upper end of the first oil pipe 1, so that these media can flow out from the through hole on the third oil pipe 9. Therefore, the third oil pipe 9 with a blind end at the lower end can be used to receive the ball seat to prevent the ball seat from falling into the horizontal well.

[0055] More specifically, the other end of the third oil pipe 9 is detachably connected to a plug 10, and the plug 10 serves as a plugging structure for forming the blind end. This embodiment is a technical solution for obtaining the blind end conveniently and taking out the ball seat conveniently.

[0056] More specifically, in order to obtain a reliable setting effect, the fourth packer 16 is a Y453 type packer, and the second packer 11 is a Y455 type packer.

[0057] Since the setting reliability requirement for the first packer 6 is not high, the first packer 6 can adopt a Z331 packer.

[0058] In this embodiment, after the second packer 11 and the fourth packer 16 are set and fixed, in order to achieve the purpose of long-term isolation, their respective unsealing needs to be performed manually, so the rubber cylinders on each are conventional rubber cylinders different from the self-dissolving rubber cylinder on the third packer 15.

[0059] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A horizontal well water control oil production device, comprising a process pipe string for dividing an isolation well section (13) and a production well section (17) in a casing (4), and also comprising a suction assembly for being arranged on the wellhead side of the casing (4) and for sucking the medium in the production well section (17) by heart, characterized in that: The process pipe string comprises a fourth oil pipe (18), a second packer (11) and a fourth packer (16), wherein the second packer (11) is connected to the outlet end of the fourth oil pipe (18), and the fourth packer (16) is connected to the inlet end of the fourth oil pipe (18); It also includes a third packer (15) arranged at the inlet end of the fourth oil pipe (18) and located between the second packer (11) and the fourth packer (16), the third packer (15) having a rubber sleeve for sealing the annular space between the third packer (15) and the casing (4), and the rubber sleeve of the third packer (15) is a soluble rubber sleeve; The process pipe column and the suction assembly are independent structures.

2. A horizontal well water control oil production device according to claim 1, characterized in that: The second packer (11) and the fourth packer (16) are both drillable packers.

3. A horizontal well water control oil production device according to claim 1, characterized in that: It also includes a centralizer (14) fixed on the fourth oil pipe (18) and located at the end of the third packer (15).

4. A horizontal well water control oil production device according to claim 1, characterized in that: The front end of the second packer (11) is connected to the outlet end of the fourth oil pipe (18), and the rear end of the fourth packer (16) is connected to the inlet end of the fourth oil pipe (18); The third packer (15) is connected in series to the fourth oil pipe (18).

5. A horizontal well water control oil production device according to claim 1, characterized in that: The front end of the second packer (11) is connected to the outlet end of the fourth oil pipe (18), and the rear end of the fourth packer (16) is connected to the inlet end of the fourth oil pipe (18); The rubber cylinder of the third packer (15) is arranged on the fourth packer (16): the fourth packer (16) comprises an outer shell, the rubber cylinder of the third packer (15) is arranged at the rear end of the outer shell, and the rubber cylinder of the third packer (15) is located behind the rubber cylinder of the fourth packer (16).

6. A horizontal well water control and oil production device according to claim 1, characterized in that: The pumping assembly comprises a first oil pipe (1), a bridge pump (2) connected to the inlet end of the first oil pipe (1), a second oil pipe (3) with one end butted to the inlet end of the bridge pump (2), a first perforated pipe (5) with one end butted to the other end of the second oil pipe (3), and a check valve (7) with the outlet end communicating with the other end of the first perforated pipe (5); The first perforated pipe (5) is a pipe with through holes arranged on the side wall; It also includes a first packer (6), and the first perforated pipe (5) is connected to the check valve (7) through the first packer (6).

7. A horizontal well water control and oil production device according to claim 6, characterized in that: The inlet end of the check valve (7) is also connected to a second perforated pipe (8), and the second perforated pipe (8) is a pipe with through holes arranged on the side wall; One end of the second perforated pipe (8) is connected to the check valve (7), and the other end of the second perforated pipe (8) is also connected to the third oil pipe (9). One end of the third oil pipe (9) is connected to the second perforated pipe (8), and the other end of the third oil pipe (9) is a blind end.

8. A horizontal well water control and oil production device according to claim 7, characterized in that: The other end of the third oil pipe (9) is detachably connected to a plug (10), and the plug (10) serves as a plugging structure for forming the blind end.

9. A horizontal well water control and oil production device according to any one of claims 1 to 8, characterized in that: The fourth packer (16) is a Y453 type packer, and the second packer (11) is a Y455 type packer.

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