Drifting tool and drift size gauge tool

Abstract

The utility model relates to a drifting tool and a drifting gauge tool, and relates to the technical field of oil and gas field development. The drifting tool comprises a dissolvable framework and a water-resisting layer, the water-resisting layer is wrapped outside a first area of an exposed surface of the dissolvable framework, and the outside of a second area of the exposed surface of the dissolvable framework is tightly attached to a release sub. In the passing process, the drift size gauge tool is like a common drift size gauge tool, and the drift size requirement can be met. After the drift size gauge tool is discarded to a shaft when the drift size is stuck, the release sub and the drift size component above the release sub can be smoothly recycled, and the second area of the dissolvable framework of the drift size gauge tool can be in contact with slurry in the shaft, so that the dissolvable framework is dissolved, and the drift size gauge tool sinking into the shaft has small interference on the flowability of fluid in the shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field development, in particular to a well cleaning tool and a well cleaning gauge. Background Art

[0002] During the exploitation of oil and gas fields, hydrostatic pressure testing is required. Before each detection device enters the well, a well-drilling tool is required to conduct well-drilling to determine whether the oil and gas well meets the entry requirements of the detection device.

[0003] At present, a well-drilling gauge is generally used for well-drilling. For example, patent CN220226848U discloses a well-drilling gauge. When the well-drilling is stuck, the shear pin supporting the well-drilling gauge is broken, so that the well-drilling gauge sleeve and the well-drilling gauge block with a larger outer diameter can be moved downward, and the upper structure of the well-drilling gauge can be smoothly retracted.

[0004] Recovering part of the well gauge by splitting the well gauge will cause the well gauge sleeve and the well gauge block to sink in the wellbore, blocking the wellbore and greatly affecting the normal flow of the fluid in the wellbore. Utility Model Content

[0005] The utility model provides a well cleaning tool and a well cleaning gauge, which are used for reducing the interference of the sinking well cleaning gauge on the fluidity of the fluid in the wellbore.

[0006] In the first aspect, the utility model provides a well clearing tool, comprising: a well clearing gauge, the well clearing gauge includes a soluble frame and a waterproof layer, the exposed surface of the soluble frame is divided into a first area and a second area, wherein the first area of ​​the soluble frame is covered with the waterproof layer; and a release joint, which is detachably connected to the well clearing gauge, and when the release joint is configured to be connected to the well clearing gauge, the second area of ​​the soluble frame is tightly fitted with the release joint.

[0007] In one embodiment, the soluble skeleton is made of a soluble magnesium-aluminum alloy material.

[0008] In one embodiment, the second region is not covered with a water-proof layer.

[0009] In one embodiment, the release joint is detachably connected to the first end of the well gauge, and a guide portion is formed at one end of the dissolvable framework away from the first end, and the guide portion is provided with a guide cone surface.

[0010] In one embodiment, the dissolvable frame is provided with a first mounting hole, the second area is located at the inner hole wall of the first mounting hole, and the release joint is at least partially inserted into the first mounting hole and fits tightly with the dissolvable frame.

[0011] In one embodiment, a first chamber is formed in the soluble skeleton, a guide hole is provided at the bottom of the soluble skeleton, and a slot is provided on the side of the soluble skeleton, and both the guide hole and the slot are connected to the first chamber.

[0012] In one embodiment, the dissolvable skeleton is provided with a plurality of flow-guiding holes, and the flow-guiding holes are evenly spaced around the axis of the dissolvable skeleton.

[0013] In one embodiment, the soluble skeleton is further provided with a first horizontally extending latch hole, the release joint is provided with a second horizontally extending latch hole, and the well-clearing device further comprises a shear pin, which passes through the first latch hole and the second latch hole to axially position the release joint.

[0014] In one embodiment, the well pulling tool further comprises a jar, which is connected to the release joint and can vibrate the release joint to break the shear pin.

[0015] In the second aspect, the utility model also provides a well-clearing gauge for being detachably connected to a release joint, the well-clearing gauge comprises a soluble frame and a waterproof layer, the exposed surface of the soluble frame is divided into a first area and a second area, wherein the first area of ​​the soluble frame is covered with the waterproof layer, and the second area is used to fit tightly with the release joint.

[0016] Compared with the prior art, the advantage of the utility model is that the well clearing gauge includes a soluble skeleton, and the exposed surface of the first area of ​​the soluble skeleton is covered with a waterproof layer, which prevents the soluble skeleton from contacting and dissolving with mud during the well clearing process, and can successfully complete the well clearing work.

[0017] When the well is stuck, the well gauge can be separated from the release joint and sunk into the wellbore to recover the well tools such as the release joint. The mud in the wellbore can contact the second area of ​​the soluble skeleton and decompose the soluble skeleton. The sunken well gauge has less interference with the fluidity of the fluid in the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic cross-sectional structure diagram of a well-clearing tool in an embodiment of the utility model;

[0020] Figure 2 It is a left-side structural schematic diagram of a well-clearing tool in an embodiment of the utility model;

[0021] Figure 3 yes Figure 1 Schematic diagram of the partially enlarged structure of the well gauge at A in the middle.

[0022] Reference numerals:

[0023] 1. Well-drilling gauge; 11. Dissolvable skeleton; 111. Guide portion; 112. First mounting hole; 113. Diversion hole; 114. First chamber; 115. Slot hole; 116. First pin hole; 12. Waterproof layer;

[0024] 2. Release connector; 21. Second latch hole; 22. Release module; 23. Upper connector;

[0025] 3. Shear pins. DETAILED DESCRIPTION

[0026] The utility model will be further described below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 3 As shown, the embodiment of the present application provides a well-drilling tool, which includes a well-drilling gauge 1 and a hand-release joint 2. The well-drilling gauge 1 includes a soluble skeleton and a water-proof layer 12 (whose section line is filled in black, Figure 1 The waterproof layer 12 covers the first area of ​​the exposed surface of the soluble skeleton, and the release joint 2 covers the second area of ​​the exposed surface of the soluble skeleton 11.

[0028] When using the well cleaning tool to clean the well, the release joint 2 is connected to the well cleaning gauge 1, and the well cleaning gauge 1 is placed in the wellbore. The exposed surface of the soluble skeleton 11 is divided into a first area covered by the waterproof layer 12, and a second area tightly fitted with the release joint 2. Even if the well cleaning gauge 1 is immersed in the mud in the wellbore, the waterproof layer 12 and the release joint 2 prevent the soluble skeleton 11 from contacting the mud, and prevent the soluble skeleton 11 from dissolving during the well cleaning process.

[0029] Since the release joint 2 is detachably connected to the well gauge 1, when the well is stuck, the release joint 2 and the well gauge 1 can be separated, so that the well gauge 1 is sunk inside the wellbore to realize the recovery of the release joint 2. The sunken well gauge 1 will be soaked in mud, and the mud will contact the second area originally covered by the release joint 2, so that the soluble skeleton 11 will dissolve. After the soluble skeleton 11 dissolves, the well gauge 1 will not block the wellbore. The discarded well gauge 1 will not affect the flow of the fluid in the well.

[0030] The maximum outer diameter of the well-drilling gauge 1 is smaller than the maximum outer diameter of the release joint 2, so as to avoid the release joint 2 getting stuck in the wellbore during the well-drilling process.

[0031] In some implementations, the soluble skeleton 11 is made of soluble magnesium-aluminum alloy material that can be dissolved in mud. Specifically, the soluble magnesium-aluminum alloy material No. 010 of Chongqing Yuhua New Materials Co., Ltd. can be selected, and its material tensile strength is ≥180MPa, yield strength is ≥120MPa, dissolution conditions are 93℃ / 3%KCl, and dissolution rate is 15-35{mg / (cm2﹒h)}. The well gauge 1 made of this material can be completely dissolved within a week.

[0032] In other implementations, the dissolvable skeleton 11 may also be made of a dissolvable aluminum alloy or a dissolvable magnesium alloy.

[0033] In some implementations, the waterproof layer 12 is formed by covering the outside of the soluble skeleton 11 with a waterproof coating. Alternatively, a waterproof film is set on the outside of the soluble skeleton 11 to form the waterproof layer 12, as long as the waterproof effect can be achieved. The exposed surface of the soluble skeleton 11 refers to all surfaces of the soluble skeleton 11 exposed to the air, that is, the exposed surface of the soluble skeleton 11 includes both the outer surface outside the soluble skeleton 11 and the various pore walls (such as the inner wall of the diversion hole, the inner wall of the slot hole) or the inner wall of the cavity (such as the inner wall of the first cavity) connected to the outer surface.

[0034] like Figure 1 and Figure 3 As shown, in some implementations, the second area is not covered with the waterproof layer 12. So that when the release joint 2 is separated from the soluble skeleton 11, the second area of ​​the exposed surface of the soluble skeleton 11 that was originally tightly fitted with the release joint 2 is exposed to the outside, and the dissolution of the soluble skeleton 11 is achieved under the immersion of mud in the wellbore. Among them, the thickness of the waterproof layer 12 should be as thin as possible while meeting the waterproof requirement. In this embodiment, the thickness of the waterproof layer 12 is 0.5 mm, which is sufficient to meet the waterproof requirement in the well clearance work. Since the thickness of the waterproof layer 12 is relatively thin, after the soluble skeleton 11 is dissolved, it will gradually split quickly under the action of the fluid in the wellbore and will not block the wellbore.

[0035] In some implementations, the release joint 2 is detachably connected to the first end of the well gauge 1, such as Figure 1 In the embodiment, the release joint 2 is detachably connected to the right end of the well-drilling gauge 1 (the release joint 2 is located at the top of the well-drilling gauge 1 when in use), and a guide portion 111 is formed at the end of the well-drilling gauge 1 away from the first end, and the guide portion 111 is provided with a guide cone surface. When in use, the end of the well-drilling gauge 1 provided with the guide portion 111 will hang down at the bottom of the well-drilling tool, and the guide cone surface of the guide portion 111 can be used to guide the downward direction of the well-drilling gauge 1, which can reduce the friction between the well-drilling gauge 1 and the pipe wall, and greatly improve the passability of the tool.

[0036] In some implementations, the guide portion 111 has a 60° guide slope, that is, the guide cone surface of the guide portion 111 forms an angle of 30° with the axis of the well gauge 1, which has better guiding performance.

[0037] like Figure 1 As shown, in some implementations, the dissolvable frame 11 is provided with a first mounting hole 112, and the release joint 2 is at least partially inserted into the first mounting hole 112. The second area of ​​the exposed surface of the dissolvable frame 11 is arranged at the inner wall of the first mounting hole 112, and when the release joint 2 is inserted into the first mounting hole 112, the outer side surface of the release joint 2 is closely fitted with the second area to prevent the second area of ​​the dissolvable frame 11 from contacting the mud and dissolving.

[0038] like Figure 1 As shown, in some implementations, the release joint 2 includes an upper joint 23 and a release module 22, wherein the release module 22 is inserted into the first mounting hole 112 and connected to the well gauge 1, and the upper joint 23 is located at the top of the release module 22, and the upper joint 23 is used to connect with the upper component of the release joint 2, such as the jar. The upper joint 23 includes a 51 mm long, M20 threaded thread, so as to be threadedly connected with the upper component of the release joint 2.

[0039] In this embodiment, the first mounting hole 112 is connected to the first chamber 114 of the well gauge 1, and only the second area is arranged at the contact between the first mounting hole 112 and the release joint 2. In other embodiments, the first mounting hole 112 is configured as a blind hole structure isolated from the first chamber 114 of the well gauge 1, so as to prevent the mud in the first chamber 114 from contacting the first mounting hole 112 when the mud enters the first chamber 114, thereby reducing the risk of accidental dissolution of the well gauge 1.

[0040] like Figure 1 and Figure 2 As shown, in some implementations, a first chamber 114 is formed in the soluble skeleton 11, a guide hole 113 is provided at the bottom of the soluble skeleton 11, and a slot 115 is further provided on the side of the soluble skeleton 11, and the guide hole 113 and the slot 115 are both connected to the first chamber 114. During the sinking process of the well gauge 1, the fluid at the bottom of the well gauge 1 can enter the first chamber 114 through the bottom guide hole 113, and flow out of the first chamber 114 through the slot 115 on the side, so as to realize the natural flow of the fluid in the wellbore and reduce the risk of the well gauge 1 blocking the wellbore and causing the well gauge 1 to sink poorly.

[0041] In this embodiment, the slot 115 is 40 mm long and 4 mm wide. In other embodiments, the size of the slot 115 can be adjusted according to the length and diameter of the well gauge 1. The inner diameter of the guide hole 113 is 3.4 mm.

[0042] like Figure 1 and Figure 2 As shown, in some implementations, the dissolvable skeleton 11 is provided with a plurality of flow guide holes 113, and the flow guide holes 113 are evenly spaced around the axis of the well gauge 1. The plurality of flow guide holes 113 can improve the conduction effect of the fluid in the wellbore, so that the well gauge 1 can sink more smoothly. By evenly distributing the flow guide holes 113, it is possible to avoid relatively uniform distribution of the fluid when passing through the well gauge 1, and avoid deflection of the well gauge 1 due to uneven distribution of the fluid.

[0043] In this embodiment, the dissolvable skeleton 11 is provided with a plurality of slots 115, and the number of the slots 115 is the same as the number of the flow-guiding holes 113. In another embodiment, the number of the slots 115 may be different from the number of the flow-guiding holes 113.

[0044] like Figure 2 As shown, in some implementations, the dissolvable skeleton 11 is provided with three guide holes 113 , and in other implementations, the number of guide holes 113 can be adjusted according to the diameter of the well gauge 1 , such as providing four, five or more guide holes 113 on the well gauge 1 .

[0045] In order to prevent the mud passing through the diversion hole 113 from contacting the soluble skeleton 11, the hole wall of the diversion hole 113 is covered with a waterproof layer 12. Similarly, the inner wall of the first chamber 114 and the hole wall of the slot 115 are also covered with a waterproof layer 12.

[0046] like Figure 1 As shown, in some implementations, the dissolvable skeleton 11 is further provided with a first latch hole 116 extending horizontally (in the up-down direction in the figure), and the release joint 2 is provided with a second latch hole 21 extending horizontally (in the up-down direction in the figure). The well-draining device further includes a shear pin 3, which passes through the first latch hole 116 and the second latch hole 21 to axially position the release joint 2.

[0047] In this embodiment, the release joint 2 is connected to the well gauge 1 through a shear pin 3 horizontally inserted into the second pin hole 21. When the shear pin 3 breaks, the well gauge 1 is separated from the release joint 2 under the action of its own gravity.

[0048] In other embodiments, the release joint 2 may also be provided with a retractable plug-in mechanism, and the release joint 2 and the well-clearing gauge 1 may be detachably connected through the plug-in mechanism that can be retracted horizontally. When the plug-in mechanism is extended, the plug-in mechanism can be inserted into the horizontal hole of the well-clearing gauge 1, thereby realizing the connection between the release joint 2 and the well-clearing gauge 1. When the plug-in mechanism is retracted, the plug-in mechanism is separated from the horizontal hole of the well-clearing gauge 1, and the well-clearing gauge 1 sinks due to the differentiated support, thereby realizing the separation of the release joint 2 and the well-clearing gauge 1. Of course, the release joint 2 may also be detachably connected to the well-clearing gauge 1 in other ways, so that when the well-clearing gauge 1 is stuck, the well-clearing gauge 1 can be smoothly dropped, thereby realizing the recovery of the release joint 2 and other well-clearing components.

[0049] In some implementations, the well cleaning tool further includes a jar, which is connected to the release joint 2, and the jar can vibrate the release joint 2 to break the shear pin 3. Breaking the shear pin 3 by jarring can reduce the probability of failure of the separation well cleaning gauge 1.

[0050] In some implementations, the inner diameter of the second pin hole is slightly larger than the outer diameter of the shear pin 3, and when the shear pin 3 is inserted into the second pin hole, a gap is left between the shear pin 3 and the hole wall of the second pin hole. When the jar jars the release joint 2, the shear pin 3 can vibrate back and forth relative to the hole wall of the second pin hole, causing the shear pin 3 to break. Specifically, in this embodiment, the diameter of the shear pin 3 is 3 mm, and the diameter of the second pin hole is 3.2 mm.

[0051] In some implementations, the well-drilling tool further includes a rope cap head and a rotary nipple. The components of the well-drilling tool are, from top to bottom, a rope cap head, a rotary nipple, a jar, a hand-release joint 2, and a well-drilling gauge 1. The rotary nipple can be used to achieve more diverse well-drilling operations.

[0052] On the other hand, an embodiment of the utility model further provides a well clearing gauge 1 for detachably connecting to a release joint 2. The well clearing gauge 1 comprises a soluble skeleton 11 and a waterproof layer 12. The exposed surface of the soluble skeleton 11 is divided into a first area and a second area, wherein the first area of ​​the soluble skeleton 11 is covered with the waterproof layer 12, and the second area is used to fit tightly with the release joint 2.

[0053] The well-drilling gauge 1 provided in this embodiment can gradually dissolve into the mud in the wellbore after being discarded when stuck, and has little interference with the fluidity of the fluid in the wellbore.

[0054] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A well cleaning tool, characterized in that: It includes: A well-drilling gauge, the well-drilling gauge comprises a soluble frame and a water-proof layer, the exposed surface of the soluble frame is divided into a first area and a second area, wherein the first area of ​​the soluble frame is covered with the water-proof layer; as well as A release joint is detachably connected to the well-clearing gauge, and when the release joint is configured to be connected to the well-clearing gauge, the second area of ​​the soluble skeleton is tightly fitted with the release joint.

2. The well-drilling tool according to claim 1, characterized in that: The soluble skeleton is made of soluble magnesium-aluminum alloy material.

3. The well-drilling tool according to claim 1 or 2, characterized in that: The second region is not covered with a water-proof layer.

4. The well-drilling tool according to claim 1 or 2, characterized in that: The release joint is detachably connected to the first end of the well gauge, and a guide portion is formed at one end of the soluble skeleton away from the first end, and the guide portion is provided with a guide cone surface.

5. The well-drilling tool according to claim 1 or 2, characterized in that: The dissolvable frame is provided with a first mounting hole, the second area is located at the inner hole wall of the first mounting hole, and the release joint is at least partially inserted into the first mounting hole and tightly fits with the dissolvable frame.

6. The well-drilling tool according to claim 1 or 2, characterized in that: A first chamber is formed in the soluble skeleton, a flow guide hole is provided at the bottom of the soluble skeleton, and a slot hole is provided at the side of the soluble skeleton. The flow guide hole and the slot hole are both connected to the first chamber.

7. The well-drilling tool according to claim 6, characterized in that: The dissolvable skeleton is provided with a plurality of the guide holes, and the guide holes are evenly spaced and arranged around the axis of the dissolvable skeleton.

8. The well-drilling tool according to claim 1, characterized in that: The dissolvable skeleton is also provided with a first latch hole extending horizontally, the release joint is provided with a second latch hole extending horizontally, and the well-clearing tool further comprises a shear pin, which passes through the first latch hole and the second latch hole to axially position the release joint.

9. The well-drilling tool according to claim 8, characterized in that: The well-drilling tool further comprises a jar, which is connected to the release joint and can vibrate the release joint to break the shear pin.

10. A well-drilling gauge, used to be detachably connected to a drop joint, characterized in that: The well-drilling gauge includes a soluble frame and a waterproof layer, and the exposed surface of the soluble frame is divided into a first area and a second area, wherein the first area of ​​the soluble frame is covered with the waterproof layer, and the second area is used to fit tightly with the drop joint.

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