Eccentric water distributor and water distribution tubular column

Abstract

The utility model relates to the field of equipment for exploiting oil from a well, in particular to an eccentric water distributor and a water distribution string. The eccentric water distributor is used for solving the problems that an existing eccentric water distributor does not have the polymer injection function, a water distribution pipe column needs to be pulled out and a polymer distribution pipe column needs to be replaced during polymer transfer injection, and the polymer injection cost is increased. The eccentric water distributor comprises an upper connecting sleeve, a water distributor main body and a lower connecting sleeve, an eccentric channel and a water distributor eccentric hole are formed in the water distributor main body, a liquid outlet hole is formed in the water distributor main body, a guide body is arranged at the top end of the water distributor main body, and a polymer injection working barrel is connected to the bottom of the water distributor eccentric hole; a polymer injection core of the polymer injection blanking plug can enter the polymer injection working barrel through the eccentric hole of the water distributor; and when the polymer injection core is mounted in the polymer injection working barrel, a liquid outlet nozzle of the polymer injection blanking plug corresponds to the liquid outlet hole. When the polymer needs to be transferred and injected, the eccentric water distributor can have the polymer injection function only by fishing out the water injection blanking plug and putting the polymer injection blanking plug into the polymer injection working barrel, the operation is convenient and fast, and the polymer injection cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of equipment for extracting oil from wells, in particular to an eccentric water distributor and a water distribution pipe column. Background Art

[0002] The eccentric water distributor is one of the downhole tools that injects liquid in layers and in a quantitative manner according to the different water absorption capacities of the oil layers. It can ensure that different oil layers obtain the appropriate amount of water to improve the displacement efficiency and ultimate recovery rate of the oil reservoir.

[0003] The Chinese utility model patent with authorization announcement number CN221256747U discloses an eccentric water distributor, which includes a water distributor body, and the upper and lower ends of the water distributor body are respectively connected to an upper connecting sleeve and a lower connecting sleeve, and the water distributor body, the upper connecting sleeve and the lower connecting sleeve are connected. An eccentric hole of the water distributor for installing a plug is provided in the water distributor body, and the plug and the eccentric hole of the water distributor are connected by a locking mechanism. A liquid outlet hole is also provided on the eccentric hole of the water distributor. When the plug is installed in the eccentric hole of the water distributor, its water nozzle is located at the position corresponding to the liquid outlet hole. A guide body is provided at the top of the water distributor body in the upper connecting sleeve, and the guide body can guide the scoop. The amount of stratified water injection is controlled by the size of the nozzle of the plug. If the nozzle diameter is not suitable, the plug needs to be replaced. In this case, a bailer is used to lower the plug into the well and replace it. The lower main claw of the bailer can move along the guide to the corresponding position of the plug to remove it. The new plug located on the upper main claw is then lowered into the eccentric hole of the water distributor and fixed. This allows the control of stratified water injection.

[0004] Water injection using an eccentric water distributor is primarily used in the early to mid-stage of oilfield development. Water can enter the pore spaces occupied by crude oil, displacing it and subsequently recovering it through oil wells. In the later stages of oilfield development, when water injection efficiency declines, polymer injection into the corresponding oil layers is necessary to improve fluid flow properties within the reservoir and enhance recovery. If polymer injection is performed directly using an eccentric water distributor, the small nozzles of the water plugs in these distributors can shear polymer chains, making it difficult to achieve effective polymer injection. Therefore, polymer injection is typically performed using a polymer injection string equipped with a polymer injection plug. In this case, the eccentric water distributor's water distribution string, which is designed for the insertion and removal of the water plug, must be removed and replaced with one designed for the insertion and removal of the polymer injection plug. After a period of polymer injection, the high-permeability channels between the oil and water wells are filled with polymer, and water injection is required again. Therefore, it is necessary to remove the eccentric water distributor string that is suitable for the casting and fishing of the injection and polymerization plug and replace it with the eccentric water distributor string that is suitable for the casting and fishing of the water injection plug. This increases the workload of the oil field stratified water injection (polymerization) well operation and significantly increases the water injection (polymerization) cost. Utility Model Content

[0005] The purpose of the present utility model is to provide an eccentric water distributor to solve the problem that the existing eccentric water distributor does not have the injection and polymerization function, and when injecting water and transferring polymer, the water distribution pipe column of the eccentric water distributor adapted to the casting and catching of the water injection plug needs to be pulled out and replaced with the distribution and polymerization pipe column of the eccentric water distributor adapted to the casting and catching of the injection and polymerization plug, which is cumbersome to operate and increases the injection and polymerization cost. The purpose of the present utility model is also to provide a water distribution pipe column to solve the problem that the existing eccentric water distributor does not have the injection and polymerization function, and when injecting water and transferring polymer, the water distribution pipe column of the eccentric water distributor adapted to the casting and catching of the water injection plug needs to be pulled out and replaced with the distribution and polymerization pipe column of the eccentric water distributor adapted to the casting and catching of the injection and polymerization plug, which is cumbersome to operate and increases the injection and polymerization cost.

[0006] In order to solve the above technical problems, an eccentric water distributor of the present invention adopts the following technical solutions:

[0007] The eccentric water distributor includes an upper connecting sleeve, a water distributor body and a lower connecting sleeve. The water distributor body is provided with an eccentric channel and an eccentric hole of the water distributor for installing a water injection plug. The water distributor body is also provided with a liquid outlet hole connected to the eccentric hole of the water distributor. A guide body is provided at the top of the water distributor body in the upper connecting sleeve to guide the scoop to enter the eccentric channel. The bottom of the eccentric hole of the water distributor is connected to an injection working cylinder. The diameter of the eccentric hole of the water distributor is sufficient for the injection core of the injection plug to pass through so that the injection core can enter the injection working cylinder. When the injection core is installed in the injection working cylinder, the liquid outlet nozzle of the injection plug corresponds to the liquid outlet hole.

[0008] Furthermore, the injection working cylinder is detachably connected to the eccentric hole of the water distributor.

[0009] Furthermore, the injection working cylinder is threadedly connected to the eccentric hole of the water distributor.

[0010] Furthermore, the threads provided on the polymer injection working cylinder and the eccentric hole of the water distributor are tapered pipe threads.

[0011] Furthermore, a lower outer sleeve is detachably connected between the water distributor body and the lower connecting sleeve, and the injection working cylinder extends into the chamber of the lower outer sleeve.

[0012] The utility model proposes an improved technical solution to the above-mentioned technical problems: an injection working cylinder for placing an injection core of an injection plug is provided at the bottom of the eccentric hole of the water distributor, and the injection core of the injection plug can enter the injection working cylinder through the eccentric hole of the water distributor under the action of a bailer, and when the injection core is installed in the injection working cylinder, the liquid outlet of the injection plug corresponds to the liquid outlet hole. In this way, when it is necessary to transfer the polymer, it is only necessary to use the bailer to scoop out the water injection plug and put the corresponding injection plug into the injection working cylinder to enable the eccentric water distributor to have the injection function. There is no need to lift out the water distribution pipe column to replace the distribution pipe column, which is convenient to operate and saves the injection cost.

[0013] Another aspect of the present invention further provides a water distribution pipe column, which adopts the following technical solutions:

[0014] The water distribution pipe column includes oil pipes and eccentric water distributors that are arranged at intervals and connected to each other. The eccentric water distributor includes an upper connecting sleeve, a water distributor body and a lower connecting sleeve. The water distributor body is provided with an eccentric channel and a water distributor eccentric hole for installing a water injection plug. The water distributor body is also provided with a liquid outlet connected to the eccentric hole of the water distributor. A guide body that can guide the scoop to enter the eccentric channel is provided at the top of the water distributor body in the upper connecting sleeve. The bottom of the eccentric hole of the water distributor is connected to an injection working cylinder. The diameter of the eccentric hole of the water distributor is sufficient for the injection core of the injection plug to pass through so that the injection core can enter the injection working cylinder. When the injection core is installed in the injection working cylinder, the liquid outlet nozzle of the injection plug corresponds to the liquid outlet.

[0015] Furthermore, the injection working cylinder is detachably connected to the eccentric hole of the water distributor.

[0016] Furthermore, the injection working cylinder is threadedly connected to the eccentric hole of the water distributor.

[0017] Furthermore, the threads provided on the polymer injection working cylinder and the eccentric hole of the water distributor are tapered pipe threads.

[0018] Furthermore, a lower outer sleeve is detachably connected between the water distributor body and the lower connecting sleeve, and the injection working cylinder extends into the chamber of the lower outer sleeve.

[0019] The utility model proposes an improved technical solution to the above-mentioned technical problems: an injection working cylinder for placing an injection core of an injection plug is provided at the bottom of the eccentric hole of the water distributor, and the injection core of the injection plug can enter the injection working cylinder through the eccentric hole of the water distributor under the action of a bailer, and when the injection core is installed in the injection working cylinder, the liquid outlet of the injection plug corresponds to the liquid outlet hole. In this way, when it is necessary to transfer the polymer, it is only necessary to use the bailer to scoop out the water injection plug and put the corresponding injection plug into the injection working cylinder to enable the eccentric water distributor to have the injection function. There is no need to lift out the water distribution pipe column to replace the distribution pipe column, which is convenient to operate and saves the injection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of an eccentric water distributor of the utility model;

[0021] Figure 2 This is a schematic diagram of the installation structure of the water distributor body, guide body and injection working cylinder;

[0022] Figure 3 It is a structural schematic diagram of part of the structure of the injection plug;

[0023] Figure 4 It is a cross-sectional view of part of the structure of the injection plug.

[0024] In the figure: 1. Upper joint; 2. Upper joint locating pin; 3. Upper outer sleeve; 4. Guide body; 5. Guide body fixing bolt; 6. Water distributor body; 7. Eccentric hole of water distributor; 8. Polymer injection working cylinder; 9. Lower outer sleeve; 10. Lower joint locating pin; 11. Lower joint; 12. Liquid outlet; 13. Guide vertical groove; 14. Polymer injection core; 141. Inner cylinder; 142. Outer cylinder; 143. Inner core rod; 15. Liquid inlet; 16. Liquid outlet nozzle; 17. Packing. DETAILED DESCRIPTION

[0025] The present invention proposes an improved technical solution to the above-mentioned technical problems. The core concept of the present invention is: an injection working cylinder for placing an injection core of an injection plug is provided at the bottom of the eccentric hole of the water distributor. The injection core of the injection plug can enter the injection working cylinder through the eccentric hole of the water distributor under the action of a bailer. When the injection core is installed in the injection working cylinder, the liquid outlet of the injection plug corresponds to the liquid outlet. In this way, when it is necessary to transfer polymer, it is only necessary to use a bailer to scoop out the water injection plug and put the corresponding injection plug into the injection working cylinder to enable the eccentric water distributor to have the injection function. There is no need to remove the water distribution pipe column to replace the distribution pipe column. The operation is convenient and the injection cost is saved.

[0026] In view of the above technical problems, the utility model provides an eccentric water distributor comprising an upper connecting sleeve, a water distributor body 6 and a lower connecting sleeve 11. The upper connecting sleeve comprises Figure 1 The upper joint 1 and upper jacket 3 shown in the figure are connected by a threaded connection between the lower outer side of the upper joint 1 and the upper inner side of the upper jacket 3, and fixed by an upper joint positioning pin 2. Of course, in another embodiment, the upper joint and the upper jacket can also be provided as one piece. The upper outer side of the water distributor body 6 is connected by a threaded connection with the lower inner side of the upper jacket 3. The water distributor body 6 is provided with an eccentric channel and a water distributor eccentric hole 7 for installing a water injection plug. The water distributor eccentric hole 7 is provided with a step, which can cooperate with the cam of the water injection plug to position the water injection plug. The water distributor eccentric hole 7 is also provided with a liquid outlet 12 connected to the water distributor eccentric hole 7. When the water injection plug is installed in the water distributor eccentric hole 7, the water nozzle on it corresponds to the liquid outlet 7, so that water can flow into the corresponding oil layer through the water nozzle and the liquid outlet 12. A device for guiding the bailer is provided at the top of the water distributor body 6 in the upper connecting sleeve. Figure 2 The guide body 4 shown is mounted on the water distributor body 6 via guide body fixing screws 5. The highest point to the lowest point of the inclined surface of the guide body 4 are connected by spiral surfaces on both sides thereof. A vertical guide slot 13 is provided at the bottom of the guide body 4, and the vertical guide slot 13 corresponds to the eccentric hole 7 of the water distributor. The spiral surface of the guide body 4 can guide the main claw of the bailer when the bailer is lowered, so as to guide the main claw to the corresponding position of the eccentric hole 7 of the water distributor below the vertical guide slot 13. The bottom of the eccentric hole 7 of the water distributor is connected to the injection mandrel 8, and the diameter of the eccentric hole 7 of the water distributor is sufficient for the injection core 14 of the injection plug to pass through so that the injection core 14 can enter the injection mandrel 8. When the injection core 14 is installed in the injection mandrel 8, the liquid outlet of the injection plug corresponds to the liquid outlet 12. In this way, when it is necessary to transfer polymer, it is only necessary to use a scooping device to scoop out the water injection plug and put the polymer injection plug into the polymer injection working cylinder 8 to enable the eccentric water distributor to have the polymer injection function. There is no need to remove the water distribution pipe column of the eccentric water distributor that is adapted to the scooping water injection plug and replace it with the polymer distribution pipe column of the eccentric water distributor that is adapted to the scooping polymer injection plug. The operation is convenient and the polymer injection cost is saved.

[0027] When polymer transfer is required, the upper main claw of the bailer is connected to a suitable polymer injection plug, and the lower main claw is connected to the water injection plug fishing head. The upper and lower main claws of the bailer are locked, and the bailer is suspended by the well test wire and lowered into the well. When the fishing head connected to the lower main claw of the bailer passes any position on the helical surface of the guide body 4, it is guided by the guide body 4 and rotates into the vertical guide groove. It then continues to descend, forcing the fishing head connected to the lower main claw of the bailer to catch the water injection plug fishing rod. The bailer is then lifted up, and the positioning cam in the water injection plug flips and loses its positioning function, causing the water injection plug to be pulled out of the water distributor eccentric hole 7 by the bailer. Continuing to ascend, the water injection plug is attracted and retracted by the strong magnet in the groove of the lower main claw of the bailer body to prevent it from affecting the bailer's descent. Afterwards, the bailer is lowered, and the polymer injection plug connected to the upper main claw is inserted into the water distributor eccentric hole 12. The polymer injection core 14 of the polymer injection plug enters the polymer injection working cylinder through the water distributor eccentric hole 12. In this way, the eccentric water distributor can also have the injection and gathering function. Because using a fishing device to deliver or fish out the plug is a prior art, it will not be described in detail here.

[0028] When the casting device puts the injection plug in place, the injection core 14 of the injection plug is located in the injection working cylinder 8, and the upper part of the injection plug is located in the eccentric hole 7 of the water distributor. Figure 3 、 Figure 4 As shown, the upper part of the injection plug is similar to the structure of the water injection plug. The injection plug is positioned on the step of the eccentric hole 7 of the water distributor through a cam, and the upper and lower sets of packings 17 seal the liquid outlet 12. The injection core 14 has Figure 4 The inner core rod 143, inner cylinder 141 and outer cylinder, the inner core rod 143 and inner cylinder, the inner cylinder 141 and outer cylinder 142, and the outer cylinder 142 and the injection mandrel 8 shown in the figure form a wavy channel to ensure that the viscosity of the polymer will not be destroyed when passing through the injection plug. When the eccentric water distributor is injected, the polymer reaches the bottom of the injection mandrel 8 through the channel of the eccentric water distributor, and reaches the liquid inlet 15 on the injection core 14 through the wavy channel formed by the injection mandrel 8 and the outer cylinder 142 of the injection plug 14. From the liquid inlet 15, the polymer enters the wavy channel between the inner cylinder 141 and the outer cylinder 142 of the injection core 14. After reaching the bottom of the injection core 14, the polymer enters the wavy channel formed by the inner cylinder 141 and the inner core rod 143 from the bottom of the injection core 14, and finally reaches the liquid outlet 16 at the top of the injection plug and enters the target layer through the liquid outlet 16.

[0029] The amount of polymer solution injected in each layer is controlled by the annular area or length between the outer diameter of the polymer injection core 142 and the inner diameter of the polymer injection mandrel 8. The annular areas between the outer diameter of the inner core rod 143 and the inner diameter of the inner cylinder 141, the outer diameter of the inner cylinder 141 and the inner diameter of the outer cylinder 142, and the outer diameter of the polymer injection core 142 and the inner diameter of the polymer injection mandrel 8 are equal. The larger the annular area or the shorter the length, the greater the polymer injection volume, and vice versa. When the layered polymer injection volume is inappropriate and needs to be adjusted, the bottom of the upper main claw of the bailer is connected to a polymer injection plug with an appropriate annular area or length, and the lower main claw is connected to the polymer injection plug bailing head, and the replacement process of the polymer injection plug is carried out.

[0030] In this embodiment, the injection mandrel 8 is detachably connected to the eccentric hole 7 of the water distributor. This facilitates installation and removal of the injection mandrel 8 and facilitates replacement if damaged, saving maintenance costs. Furthermore, in other embodiments, the injection mandrel and the eccentric hole of the water distributor can be permanently connected by gluing or welding. Of course, in another embodiment, the injection mandrel and the eccentric hole of the water distributor can also be directly integrally formed.

[0031] In this embodiment, the injection mandrel 8 is threadedly connected to the eccentric hole 7 of the water distributor. This threaded connection ensures a secure connection and a tight seal. Alternatively, in other embodiments, the injection mandrel and the eccentric hole of the water distributor may be connected via a flange, with a flange positioned at the bottom of the eccentric hole of the water distributor and a connecting flange positioned at the top of the injection mandrel. This connection ensures a secure connection between the two.

[0032] In this embodiment, the threads provided on the injection mandrel 8 and the eccentric hole 7 of the water distributor are tapered pipe threads. The bottom of the eccentric hole 7 of the water distributor is provided with a tapered pipe thread, and the upper outer portion of the injection mandrel 8 is provided with a matching tapered pipe thread, which ensures a tight connection between the two. In other embodiments, the threads provided on the injection mandrel and the eccentric hole of the water distributor can also be conventional connecting threads.

[0033] In this embodiment, a lower outer sleeve 9 is detachably connected between the water distributor body 6 and the lower connecting sleeve 11. The upper inner side of the lower outer sleeve 9 is threadedly connected to the lower outer side of the water distributor body 6. The lower inner side of the lower outer sleeve 9 is also threadedly connected to the upper inner side of the lower connecting sleeve 11, and secured by a lower joint locating pin 10. The injection mandrel 8 extends into the chamber of the lower outer sleeve 8. This prevents interference between the injection mandrel 8 and the lower connecting sleeve 11, and the lower outer sleeve 11 is detachably connected to the water distributor body 6 and the lower connecting sleeve 11. When the injection mandrel 8 needs to be installed or maintained, the lower outer sleeve 9 can be removed, making installation and maintenance of the injection mandrel 8 easier.

[0034] Another aspect of the present invention provides a water distribution pipe column, which includes oil pipes and eccentric water distributors that are arranged at intervals and communicate with each other. The eccentric water distributor is the same as the above-mentioned embodiment of the eccentric water distributor, so it will not be described here in detail.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. An eccentric water distributor, comprising an upper connecting sleeve, a water distributor body, and a lower connecting sleeve. The water distributor body is provided with an eccentric channel and an eccentric hole for mounting a water injection plug. The water distributor body is also provided with a liquid outlet connected to the eccentric hole. A guide body is provided at the top of the water distributor body in the upper connecting sleeve to guide a scoop into the eccentric channel. The invention is characterized in that: The bottom of the eccentric hole of the water distributor is connected to an injection working cylinder. The diameter of the eccentric hole of the water distributor is sufficient for the injection core of the injection plug to pass through so that the injection core enters the injection working cylinder. When the injection core is installed in the injection working cylinder, the liquid outlet of the injection plug corresponds to the liquid outlet hole.

2. The eccentric water distributor according to claim 1, characterized in that: The polymer injection working cylinder is detachably connected to the eccentric hole of the water distributor.

3. The eccentric water distributor according to claim 2, characterized in that: The polymer injection working cylinder is threadedly connected to the eccentric hole of the water distributor.

4. The eccentric water distributor according to claim 3, characterized in that: The threads arranged on the polymer injection working cylinder and the eccentric hole of the water distributor are tapered pipe threads.

5. The eccentric water distributor according to any one of claims 1 to 4, characterized in that: A lower outer sleeve is detachably connected between the water distributor body and the lower connecting sleeve, and the injection working cylinder extends into the chamber of the lower outer sleeve.

6. A water distribution pipe column comprising oil pipes and eccentric water distributors arranged at intervals and communicating with each other, the eccentric water distributor comprising an upper connecting sleeve, a water distributor body, and a lower connecting sleeve, the water distributor body being provided with an eccentric channel and an eccentric hole for mounting a water injection plug, the water distributor body also being provided with a liquid outlet communicating with the eccentric hole, a guide being provided at the top of the water distributor body within the upper connecting sleeve to guide a scoop into the eccentric channel, characterized in that: The bottom of the eccentric hole of the water distributor is connected to an injection working cylinder. The diameter of the eccentric hole of the water distributor is sufficient for the injection core of the injection plug to pass through so that the injection core enters the injection working cylinder. When the injection core is installed in the injection working cylinder, the liquid outlet of the injection plug corresponds to the liquid outlet hole.

7. The water distribution pipe column according to claim 6, characterized in that: The polymer injection working cylinder is detachably connected to the eccentric hole of the water distributor.

8. The water distribution pipe column according to claim 7, characterized in that: The polymer injection working cylinder is threadedly connected to the eccentric hole of the water distributor.

9. The water distribution pipe column according to claim 8, characterized in that: The threads arranged on the polymer injection working cylinder and the eccentric hole of the water distributor are tapered pipe threads.

10. The water distribution pipe column according to any one of claims 6 to 9, characterized in that: A lower outer sleeve is detachably connected between the water distributor body and the lower connecting sleeve, and the injection working cylinder extends into the chamber of the lower outer sleeve.

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