Water control tool for vertical well and oil extraction equipment

Abstract

The invention relates to the technical field of oil production equipment, and discloses a water control tool for a vertical well and oil production equipment. The water control tool for the vertical well comprises a hollow mandrel and an adjusting floater, the hollow mandrel comprises a first shaft section and a second shaft section which are sequentially arranged in the axial direction, a limiting shaft shoulder is formed between the first shaft section and the second shaft section, the first shaft section is provided with a plurality of first holes, and the second shaft section is provided with a hole distribution area and an optical shaft area which extend in the axial direction; the hole distribution area is provided with a plurality of second holes; the adjusting floater slidably sleeves the second shaft section and is in clearance fit with the second shaft section, the length size of the adjusting floater is larger than or equal to the axial length size of the hole distribution area, the inner diameter of the adjusting floater is smaller than the diameter of the limiting shaft shoulder, and the gravity of the adjusting floater is smaller than the buoyancy of water and larger than the buoyancy of crude oil; the number of the first holes accounts for 10% of the total number of the holes, and the length size of the optical axis area is larger than or equal to the length size of the adjusting floater. Therefore, the problem of premature water channeling in water injection oil extraction of the low-viscosity oil stratum is effectively solved.

Description

Technical Field

[0001] This application belongs to the field of oil extraction equipment technology, specifically relating to a water control tool and oil production equipment for vertical wells. Background Technology

[0002] In the field of oil extraction, for areas with highly heterogeneous carbonate reservoirs, water injection development often leads to premature water channeling due to uneven production profiles. Therefore, downhole water control tools are needed to control the wellbore production profile.

[0003] Currently, the existing automatic water control tools in the industry mainly achieve automatic flow regulation and water control by identifying the viscosity difference between oil and water. However, when the viscosity of crude oil is low (the viscosity of oil and water is close), the automatic water control tools AICD often fail to achieve the expected results, which directly affects the crude oil production. Summary of the Invention

[0004] The purpose of this application is to provide a water control tool and oil production equipment for vertical wells, in order to solve the problem that the existing automatic water control tool AICD cannot be applied to the crude oil extraction of oil wells with low crude oil viscosity, resulting in poor extraction effect.

[0005] To achieve the above objectives, the first aspect of this application provides a water control tool for vertical wells, comprising: A hollow mandrel includes a first shaft segment and a second shaft segment arranged sequentially along the axial direction. A limiting shoulder is formed between the first shaft segment and the second shaft segment. The first shaft segment is provided with a plurality of first holes and is used for connecting an external oil pipe at one end away from the second shaft segment. The second shaft segment is provided with a perforation area and a light shaft area extending along the axial direction. The perforation area is arranged close to the limiting shoulder and is provided with a plurality of second holes. An adjusting float is slidably sleeved on the second shaft section and has a clearance fit with the second shaft section. The length of the adjusting float is greater than or equal to the axial length of the perforation area. The inner diameter of the adjusting float is smaller than the diameter of the limiting shoulder. The weight of the adjusting float is less than the buoyancy of water and greater than the buoyancy of crude oil. The number of the first aperture accounts for 10% of the total number of the first aperture and the second aperture, and the length of the optical axis region is greater than or equal to the length of the adjusting float.

[0006] As a further improvement to the above technical solution: In some embodiments, the gap between the adjusting float and the hollow mandrel is 0.5 mm to 1 mm.

[0007] In some embodiments, the flow area of ​​a single second orifice is greater than or equal to the flow area formed between the end face of the regulating float and the second shaft segment.

[0008] In some embodiments, a plurality of second holes form a plurality of virtual perforation rings along the axial direction in the perforation area, and each perforation ring is provided with a predetermined number of second holes; The spacing between any two adjacent perforated rings is L, and the value of L ranges from [value missing]. , This represents the minimum rate at which the oil-water interface rises in the current oil well. This represents the maximum rate of rise of the oil-water interface in the current oil well. It can be 0.5 hours or 1 hour.

[0009] In some embodiments, a plurality of second holes form a plurality of virtual perforation rings along the axial direction in the perforation area, and each perforation ring is provided with a predetermined number of second holes; The spacing L between any two adjacent perforated rings is 1 to 2 cm.

[0010] In some embodiments, the number of second holes in each pair of adjacent perforated rings is the same; Alternatively, the second holes in each pair of adjacent perforated rings are staggered.

[0011] In some embodiments, the number of second holes provided in the perforated ring is 2 to 3.

[0012] In some embodiments, a plurality of second holes are arranged in a tower-like pattern in the perforation area, and the number of second holes gradually decreases from one end near the first shaft segment to the other end away from the first shaft segment.

[0013] In some embodiments, four second holes are provided in the perforated ring located away from the first shaft segment, and one second hole is provided in the perforated ring located near the first shaft segment.

[0014] In some embodiments, the diameter of the first or second aperture is 4 mm ± 1.5 mm.

[0015] In some implementations, the diameter of the first aperture is the same as the diameter of the second aperture.

[0016] In some embodiments, the regulating float has an annular closed chamber.

[0017] In some embodiments, the adjusting float is a solid polypropylene resin component with a density of 0.9sg.

[0018] In some embodiments, the second shaft segment has at least three rows of guide rail assemblies on its outer peripheral surface. Each row of guide rail assemblies includes a plurality of movable balls embedded in the outer peripheral surface of the second shaft segment, and the balls roll in cooperation with the inner peripheral surface of the adjusting float.

[0019] In some embodiments, a mudguard is also fitted on the outer peripheral surface of the second shaft segment, and an active space is formed between the mudguard and the outer peripheral surface of the second shaft segment for the adjusting float to slide. The mesh diameter of the mudguard is smaller than the gap between the adjusting float and the second shaft segment.

[0020] To achieve the above objectives, a second aspect of this application provides an oil production device, including a water control tool for a vertical well provided in the first aspect above.

[0021] Compared to existing technologies, the water control tool and oil production equipment for vertical wells provided in this application have at least the following beneficial effects: The water control tool for vertical wells provided in this application is designed for use in vertical wells. During use, the gap between the adjusting float and the wellbore is used to create an annular zone. Because the weight of the adjusting float is less than the buoyancy of water but greater than the buoyancy of crude oil, the adjusting float floats at the oil-water interface formed by water and oil in the annular zone. Since the adjusting float is slidably mounted on the second shaft section, it rises and falls synchronously with the oil-water interface as it rises and falls within the annular zone. Specifically, when the annular zone is filled with crude oil, the entire adjusting float descends to the bare shaft area, and all orifices (first orifice and second orifice) are fully open. When the water level in the annular zone increases, the oil-water interface rises... During the axial ascent of the adjusting float, it blocks part of the second orifice located in the perforation zone. As the oil-water interface rises, the adjusting float blocks more and more second orifices, thus reducing the amount of liquid entering the hollow shaft. When the annulus is filled with water (false water phenomenon), the adjusting float rises and abuts against the limiting shoulder. At this point, the adjusting float has risen to its maximum position and can block all the second orifices in the perforation zone, leaving only the first orifice located in the first shaft section unblocked. That is, 90% of the orifices are blocked and 10% remain open. When the well is reopened, the accumulated water in the annulus can be drained, preventing oil from being trapped in the formation. Thus, the water control tool for vertical wells provided in this application can automatically adjust the number of orifices according to the oil-water density difference and changes in the oil-water interface, thereby controlling the flow area to achieve automatic control of the amount of liquid (oil, water, oil-water mixture) entering the hollow shaft, effectively solving the problem of premature water channeling during water injection for oil production in low-viscosity oil formations.

[0022] In addition, due to the function of the limiting shoulder, the first hole on the first shaft section is always in the normally open state. Thus, retaining 10% of the normally open holes can also be used for positive extrusion unblocking in the case of formation or wellbore scaling.

[0023] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 An isometric view of a water control tool for vertical wells provided in an embodiment of this application; Figure 2 A cross-sectional view of the hollow mandrel with female threads installed at both ends in the water control tool for vertical wells provided in the embodiments of this application; Figure 3 for Figure 1 The image shows a front view of a water control tool for a vertical well. Figure 4 for Figure 3 A cross-sectional view along line AA of the water control tool for a vertical well shown; Figure 5 for Figure 4 A magnified view of a portion of point B in the middle; Figure 6 for Figure 4 A magnified view of a portion of point C in the middle; Figure 7 An isometric view of another water control tool for vertical wells provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures 100. Hollow mandrel; 110. First shaft section; 111. First eyelet; 120. Second shaft section; 120a. Hole area; 120b. Optical axis area; 121. Second eyelet; 130. Limiting shoulder; 200. Adjust the float; 210. Seal the chamber; 300, female buckle. Detailed Implementation

[0026] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0027] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] Example Please see Figure 1 , Figure 2 and Figure 3 This embodiment provides a water control tool for vertical wells, and in particular, a density-sensitive automatic water control tool for vertical wells. It utilizes the density difference between oil and water and the change of the oil-water interface to automatically control the amount of liquid (oil, water, oil-water mixture) entering the hollow mandrel 100.

[0029] In this embodiment, the water control tool for vertical wells includes a hollow mandrel 100 and an adjusting float 200. The hollow mandrel 100 includes a first shaft section 110 and a second shaft section 120 arranged sequentially along the axial direction. A limiting shoulder 130 is formed between the first shaft section 110 and the second shaft section 120. The first shaft section 110 is provided with a plurality of first holes 111, and an end away from the second shaft section 120 is used for connecting an external tubing. The second shaft section 120 is provided with an axially extending perforation area 120a and a smooth shaft area 120b. The perforation area 120a is arranged close to the limiting shoulder 130, and a plurality of second holes 121 are provided within the perforation area 120a. Both the first holes 111 and the second holes 121 communicate with the inner cavity of the hollow mandrel 100, allowing liquid to enter and exit the hollow mandrel 100 and then enter the tubing. The number of first holes 111 accounts for 10% of the total number of first holes 111 and second holes 121.

[0030] The adjusting float 200 is slidably sleeved on the second shaft section 120 and has a clearance fit with the second shaft section 120. The length of the adjusting float 200 is greater than or equal to the axial length of the perforation area 120a. The inner diameter of the adjusting float 200 is less than the diameter of the limiting shoulder 130. The weight of the adjusting float 200 is less than the buoyancy of water and greater than the buoyancy of crude oil. The length of the optical axis area 120b is greater than or equal to the length of the adjusting float 200.

[0031] It is understandable that the water control tool for vertical wells is used in vertical wells, and when in use, the entire hollow mandrel 100 is placed vertically. Since the section float is slidably sleeved on the second shaft section 120, and the adjusting float 200 and the second shaft section 120 are intermittently engaged, the adjusting float 200 can slide along the axial direction of the second shaft section 120.

[0032] When the water control tool is used in a vertical well, the gap between the adjusting float 200 and the well wall forms an annulus. Since the weight of the adjusting float 200 is less than the buoyancy of water but greater than the buoyancy of crude oil, the adjusting float 200 will float at the oil-water interface formed by water and oil in the annulus. Therefore, as the oil-water interface in the annulus rises and falls, the adjusting float 200 will rise and fall synchronously with the oil-water interface.

[0033] Furthermore, since the inner diameter of the adjusting float 200 is smaller than the diameter of the limiting shoulder 130, when the adjusting float 200 rises to its maximum height, the adjusting float 200 abuts against the limiting shoulder 130 to limit the adjusting float 200 from continuing to rise, thereby ensuring that the first hole 111 on the first shaft section 110 is never blocked or covered by the adjusting float 200.

[0034] Please refer to the following: Figure 4 and Figure 5 Furthermore, the perforation area 120a is arranged close to the limiting shoulder 130, and the length of the adjusting float 200 is greater than or equal to the axial length of the perforation area 120a. Thus, when the adjusting float 200 rises and abuts against the limiting shoulder 130, it can fully cover the perforation area 120a, completely blocking the second hole 121 on the second shaft section 120. In addition, when the adjusting float 200 falls to the optical axis area 120b, since the length of the optical axis area 120b is greater than or equal to the length of the adjusting float 200, it can be ensured that the entire adjusting float 200 can be completely moved to the optical axis area 120b. At this time, the perforation area 120a is exposed and unobstructed, so the second hole 121 of the control ball is fully open, and the corresponding holes (first hole 111, second hole 121) on the entire hollow spindle 100 are 100% open.

[0035] Thus, when the water control tool for vertical wells provided in this embodiment is used in a vertical well, when the annulus is filled with crude oil, the entire adjusting float 200 will descend to the optical axis zone 120b, and all orifices (first orifice 111 and second orifice 121) will be fully opened. When the water in the annulus increases, the oil-water interface will rise. During the axial ascent of the adjusting float 200, the adjusting float 200 will block part of the second orifice 121 located in the orifice zone 120a. Furthermore, as the oil-water interface continues to rise, the second orifice blocked by the adjusting float 200 will... The more orifices 121 there are, the less liquid enters the hollow mandrel. When the annulus is filled with water (false water phenomenon), the adjusting float 200 will rise and abut against the limiting shoulder 130. At this time, the adjusting float 200 has risen to its maximum position and can block the second orifice 121 of the entire orifice area 120a, leaving only the first orifice 111 located in the first shaft section 110 unblocked. That is, 90% of the orifices are blocked and covered, leaving 10% of the orifices in the open state. When the well is opened again, the accumulated water in the annulus can be discharged, preventing oil from being trapped in the formation. In this way, the water control tool for vertical wells provided in this application can automatically adjust the number of orifices according to the oil-water density difference and the oil-water interface change, thereby controlling the flow area to achieve automatic control of the amount of liquid (oil, water, oil-water mixture) entering the hollow mandrel 100, thereby effectively solving the problem of premature water channeling in low-viscosity oil formations.

[0036] In addition, due to the function of the limiting shoulder 130, the first hole 111 on the first shaft section 110 is always in the normally open state. Thus, retaining 10% of the normally open holes can also be used for positive extrusion unblocking in the case of formation or wellbore scaling.

[0037] To better understand the technical solution of this application, the details of the water control tool for vertical wells provided in this embodiment are described below: In this embodiment, the diameter of the first shaft segment 110 is larger than the diameter of the second shaft segment 120, resulting in a sudden change in cross-section at the transition between the first shaft segment 110 and the second shaft segment 120, thereby forming a limiting shoulder 130. Of course, in some embodiments, an annular retaining ring can be welded at the boundary between the second shaft segment 120 and the first shaft segment 110 to form the limiting shoulder 130.

[0038] Please see Figure 4 and Figure 6 In this embodiment, the gap between the float 200 and the hollow spindle 100 is adjusted to 0.5mm to 1mm (e.g., Figure 6 As shown in the figure, the gap width is indicated by the letter D. The gap described here is 0.5mm to 1mm on both sides when the axis of the adjusting float 200 coincides with that of the hollow spindle 100. This is to facilitate smoother sliding of the adjusting float 200 along the second shaft segment 120 of the hollow spindle 100 and to prevent fine impurities from jamming the adjusting float 200.

[0039] To ensure that the adjusting float 200 can smoothly adapt to changes in the oil-water interface, the sliding friction force f and its own weight G must be considered during the design phase. 油 <G+f<F 水 F 油 F represents the buoyancy of the crude oil in the well. 水 This refers to the buoyancy of the water in the well.

[0040] Furthermore, to improve the water control effect of the regulating float 200, the design of the second orifice 121 needs to consider the size of the flow area and the size of the flow area formed between the end face of the regulating float 200 and the second shaft section 120. Thus, the flow area of ​​a single second orifice 121 is designed to be greater than or equal to the flow area formed by the gap between the end face of the regulating float 200 and the second shaft section 120. That is, there is a gap between the end face of the regulating float 200 and the second shaft section 120, which allows liquid to pass through. The flow area of ​​this gap is designed to be less than or equal to the flow area of ​​a single second orifice 121, ensuring the water control effect of the water control tool for vertical wells and minimizing any impact.

[0041] In some embodiments, a plurality of second holes 121 form a plurality of virtual perforated rings along the axial direction in the perforation area 120a, and each perforated ring has a predetermined number of second holes 121. The distance between any two adjacent perforated rings is L, and the value of L ranges from [value missing]. , This represents the minimum rate at which the oil-water interface rises in the current oil well. This represents the maximum rate of rise of the oil-water interface in the current oil well. The interval is 0.5 hours or 1 hour. That is to say, the distance L between two adjacent perforated rings is determined based on the minimum and maximum rise rates of the oil-water interface in the current oil well within 0.5 hours or 1 hour.

[0042] Understandably, because the crude oil production and discharge rates differ in each oil well, the water injection rates also differ, resulting in variations in the rate of rise of the oil-water interface. Therefore, in this embodiment, the minimum rate of rise of the oil-water interface in the current oil well is defined as follows: And the maximum rate of rise of the oil-water interface in the current oil well. The spacing L between each pair of adjacent perforation rings needs to be calculated and evaluated based on the actual oil well operation to design a more reasonable value. In this embodiment, the spacing is not limited to L. The specific value.

[0043] Of course, in other embodiments, a large amount of oil production data from different oil wells is collected, and a reasonable numerical range is determined by combining these data, that is, the distance L between each two adjacent perforation rings is 1 to 2 cm.

[0044] In some embodiments, the number of second holes 121 provided in every two adjacent perforated rings is the same. That is, multiple second holes 121 are evenly distributed in the corresponding perforated rings. Thus, this layout is applicable to situations where the controlled area is in a laminar flow state and there is a clear interface between oil and water, achieving water restriction but not oil restriction under high water content conditions.

[0045] Optionally, the second holes 121 in each pair of adjacent perforated rings are staggered to avoid the second holes 121 on the two adjacent perforated rings being on the same straight line, thereby achieving stress dispersion and ensuring the structural strength of the hollow mandrel 100.

[0046] Optionally, the number of second holes 121 provided in the perforated ring is 2 to 3.

[0047] Optionally, the number of first holes 111 can also be set to two, located in the same radial plane, or they can be distributed in different radial planes.

[0048] In other embodiments, a plurality of second orifices 121 are arranged in a tower-like pattern in the orifice region 120a, with the number of second orifices 121 gradually decreasing from one end near the first shaft segment 110 to the end away from the first shaft segment 110. This arrangement is thus applicable to situations where the annulus is turbulent and there is no clear interface between oil and water, achieving greater throttling with higher water content.

[0049] Specifically, the perforated rings located away from the first shaft segment 110 have four second holes 121, and the perforated rings located closer to the first shaft segment 110 have one second hole 121. Taking nine perforated rings as an example, from top to bottom: the top two rings each have one hole, the middle three rings each have two holes, and the bottom four rings each have three holes. It should be understood that the above is only an example and is not intended to limit the scope of protection of this application.

[0050] The diameter of the first orifice 111 or the second orifice 121 is 4mm ± 1.5mm. In this embodiment, the diameter of the first orifice 111 and the diameter of the second orifice 121 are the same, both being 4mm. The flow-limiting effect was initially calculated and demonstrated using water as a test, as follows: The diameters of the first orifice 111 and the second orifice 121 are 4 mm, the discharge rate Q = 80 L / min, the flow coefficient C is 0.60, and the water density is... =1.0sg, calculate ΔP according to the formula below.

[0051]

[0052] In the formula, A is the current flow area of ​​the open orifice. The pressure difference of the fluid passing through the orifices was calculated. The injection pressures corresponding to different numbers of orifices were approximately: 1.63 MPa for 3 orifices; 0.407 MPa for 6 orifices; 0.181 MPa for 9 orifices; 0.102 MPa for 12 orifices; 0.065 MPa for 15 orifices; 0.0452 MPa for 18 orifices; 0.0332 MPa for 21 orifices; and 0.0254 MPa for 24 orifices. Based on the above data, it can be seen that the water control tool for vertical wells provided in this embodiment can achieve a significant flow restriction effect.

[0053] Please see Figure 7 In some embodiments, the adjusting float 200 is made of metal or non-metal materials. The density of these materials is usually greater than that of water. Therefore, an annular closed chamber 210 is required inside the adjusting float 200 to ensure that the weight of the adjusting float 200 is less than the buoyancy of water and greater than the buoyancy of crude oil.

[0054] Optionally, the mandrel is made of stainless steel super 13Cr alloy, which has strong corrosion resistance and anti-scaling ability. The adjusting float 200 is made of carbon fiber composite material, which has the characteristics of high strength, light weight (density 1.5sg-2.0sg) and strong corrosion resistance.

[0055] Please see Figure 4 In other embodiments, the adjusting float 200 is a solid polypropylene resin component with a density of 0.9sg, which is between the density of water and crude oil.

[0056] Furthermore, in order to reduce the friction of the adjusting float 200 sliding, this embodiment provides at least three rows of guide rail assemblies on the outer peripheral surface of the second shaft segment 120. Each row of guide rail assemblies extends radially and includes multiple movable balls embedded in the outer peripheral surface of the second shaft segment 120. The balls roll in cooperation with the inner peripheral surface of the adjusting float 200. This sliding cooperation can effectively reduce friction.

[0057] In some embodiments, a mudguard is also fitted on the outer peripheral surface of the hollow mandrel 100. The two ends of the mudguard are fixed by female buckles 300 provided at the ends of the hollow mandrel 100. An active space for the adjusting float 200 to slide is formed between the mudguard and the outer peripheral surface of the second shaft section 120. The mesh diameter of the mudguard is smaller than the gap between the adjusting float 200 and the second shaft section 120 to prevent rock sand from entering the assembly gap.

[0058] Optionally, the mudguard is made of a screen with a mesh size of 40 or greater.

[0059] Optionally, the metal components of the water control tool for vertical wells are coated with anti-corrosion coatings both inside and out to extend their service life.

[0060] Please see Figures 1 to 7 Furthermore, this embodiment also provides an oil production device. The oil production device includes a water control tool for vertical wells as described above.

[0061] It should also be noted that the water control tools for vertical wells need to be soaked in acid for descaling regularly. Specifically, an acid soaking operation should be carried out once every 1-2 quarters. 10% hydrochloric acid is pumped into the wellhead and enters and fills the inner and outer space of the water control tools for vertical wells. After soaking for 12-24 hours, production can be resumed.

[0062] It should be noted that, in this application, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A water control tool for vertical wells, characterized in that, include: A hollow mandrel (100) includes a first shaft segment (110) and a second shaft segment (120) arranged sequentially along the axial direction. A limiting shoulder (130) is formed between the first shaft segment (110) and the second shaft segment (120). The first shaft segment (110) is provided with a plurality of first holes (111) and is used for connecting an external oil pipe at one end away from the second shaft segment (120). The second shaft segment (120) is provided with a perforated area (120a) and a smooth shaft area (120b) extending along the axial direction. The perforated area (120a) is arranged close to the limiting shoulder (130) and is provided with a plurality of second holes (121). An adjusting float (200) is slidably sleeved on the second shaft section (120) and has a clearance fit with the second shaft section (120). The length dimension of the adjusting float (200) is greater than or equal to the axial length dimension of the perforated area (120a). The inner diameter of the adjusting float (200) is smaller than the diameter of the limiting shoulder (130). The weight of the adjusting float (200) is less than the buoyancy of water and greater than the buoyancy of crude oil. The number of the first eyelet (111) accounts for 10% of the total number of the first eyelet (111) and the second eyelet (121), and the length of the optical axis region (120b) is greater than or equal to the length of the adjusting float (200).

2. The water control tool for vertical wells according to claim 1, characterized in that, The gap between the adjusting float (200) and the hollow mandrel (100) is 0.5mm to 1mm.

3. The water control tool for vertical wells according to claim 1, characterized in that, The flow area of ​​a single second orifice (121) is greater than or equal to the flow area formed between the end face of the regulating float (200) and the second shaft segment (120).

4. The water control tool for vertical wells according to claim 1, characterized in that, Multiple second holes (121) form multiple virtual perforation rings along the axial direction in the perforation area (120a), and each perforation ring is provided with a preset number of second holes (121). The spacing between any two adjacent perforated rings is L, and the value of L ranges from [value missing]. , This represents the minimum rate at which the oil-water interface rises in the current oil well. This represents the maximum rate of rise of the oil-water interface in the current oil well. It can be 0.5 hours or 1 hour.

5. The water control tool for vertical wells according to claim 1, characterized in that, Multiple second holes (121) form multiple virtual perforation rings along the axial direction in the perforation area (120a), and each perforation ring is provided with a preset number of second holes (121). The spacing L between any two adjacent perforated rings is 1-2 cm.

6. The water control tool for vertical wells according to claim 4 or 5, characterized in that, The number of second holes (121) in each pair of adjacent perforated rings is the same; Alternatively, the second eyelet (121) in each of two adjacent perforated rings is staggered.

7. The water control tool for vertical wells according to claim 6, characterized in that, The number of the second holes (121) provided in the perforated ring is 2 to 3.

8. The water control tool for vertical wells according to claim 4 or 5, characterized in that, Multiple second holes (121) are arranged in a tower shape in the perforation area (120a), and the number of second holes (121) in the perforation area (120a) gradually decreases from one end near the first shaft segment (110) to one end away from the first shaft segment (110).

9. The water control tool for vertical wells according to claim 8, characterized in that, Four second holes (121) are provided in the perforated ring located away from the first shaft segment (110), and one second hole (121) is provided in the perforated ring close to the first shaft segment (110).

10. The water control tool for vertical wells according to claim 1, characterized in that, The diameter of the first hole (111) or the second hole (121) is 4mm ± 1.5mm.

11. The water control tool for vertical wells according to claim 1 or 10, characterized in that, The diameter of the first eyelet (111) is the same as the diameter of the second eyelet (121).

12. The water control tool for vertical wells according to claim 1, characterized in that, The regulating float (200) has an annular closed chamber (210).

13. The water control tool for vertical wells according to claim 1, characterized in that, The regulating float (200) is a solid polypropylene resin component with a density of 0.9sg.

14. The water control tool for vertical wells according to claim 1, characterized in that, The second shaft segment (120) has at least three rows of guide rail assemblies on its outer peripheral surface. Each row of the guide rail assembly includes a plurality of movable balls embedded in the outer peripheral surface of the second shaft segment (120). The balls roll in cooperation with the inner peripheral surface of the adjusting float (200).

15. The water control tool for vertical wells according to claim 1, characterized in that, A mudguard is also fitted on the outer peripheral surface of the second shaft segment (120). The mudguard and the outer peripheral surface of the second shaft segment (120) form an active space for the adjustment float (200) to slide. The mesh diameter of the mudguard is smaller than the gap between the adjustment float (200) and the second shaft segment (120).

16. An oil extraction device, characterized in that, Includes water control tools for vertical wells according to any one of claims 1-15.

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