Hard formation sidetracking one-trip feeding suspension mechanism

Abstract

The invention relates to the field of petroleum drilling tools, and particularly discloses a one-trip feeding suspension mechanism for hard formation sidetracking. The mechanism comprises a frame body, a first connecting assembly and a second connecting assembly. The frame body consists of a first frame body and a second frame body which are connected at an obtuse angle; the first connecting assembly is arranged at the end, away from the second frame body, of the first frame body, located on the inner side of the obtuse angle and detachably connected with the side face of the milling cone. The second connecting assembly is arranged at the end, away from the first frame body, of the second frame body, located outside the obtuse angle and used for being detachably connected with the inner side face of the top end of the whipstock. By means of the frame body of an obtuse angle structure and the connecting assemblies arranged on the inner side and the outer side in a differentiated mode, the axis of the whipstock and the axis of the milling cone are kept collinear after installation, and the whole mechanism is completely contained in the projection area of the milling cone. The design thoroughly solves the problems that the outer diameter exceeds the profile of a milling cone due to traditional shearing bolt connection, and one-time tripping-in cannot be achieved, the hard formation sidetracking operation efficiency is remarkably improved, and the construction risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling tools, in particular to a one-trip delivery suspension mechanism for side drilling in hard formations. Background Art

[0002] To increase the drainage area of oil and gas reservoirs and improve oil and gas field recovery, branch well technology has become a key means of increasing production and efficiency in the oil industry. This technology involves drilling multiple branch wellbores within the main wellbore, achieving multi-target and three-dimensional production, thereby improving reservoir recovery and economic benefits.

[0003] During the drilling process of branch wells, the milling cone, whipstock and anchor need to be connected and sent in one trip for pre-windowing operations. For side drilling branch wells in hard formations, due to the high hardness of the formation, windowing is difficult, and short parabolic PDC milling cones are generally used. The whipstocks mostly use shear bolts to connect the short parabolic milling cones. After connection, the outer diameter of the entire system will exceed the outer diameter of the milling cone, and one-trip running is impossible. The whipstock and anchor must be run in separately using a running tool, and then the milling cone is run in separately, which greatly increases the operation cost and operation risk. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a one-trip delivery and suspension mechanism for sidetracking in hard formations, which aims to solve the problem of requiring the whipstock, anchor, and milling cone to be delivered into the well in stages during branch well drilling.

[0005] The present invention provides a one-trip feeding suspension mechanism for sidetracking in hard formations, comprising: The frame includes a first frame and a second frame connected to each other, wherein the angle between the extension direction of the first frame and the extension direction of the second frame is an obtuse angle; A first connecting assembly is provided at an end of the first frame away from the second frame and located on a side close to the inner side of the obtuse angle, the first connecting assembly being used for detachably connecting to the side surface of the milling cone; a second connecting assembly, disposed at an end of the second frame away from the first frame and located on a side close to the outside of the obtuse angle, the second connecting assembly being configured to be detachably connected to an inner side surface of a top end of the whipstock; When the first connecting component is connected to the milling cone and the second connecting component is connected to the bevel, the axes of the milling cone and the bevel are collinear, and the frame, the first connecting component and the second connecting component are all located within the axial projection area of the milling cone.

[0006] According to the one-trip delivery suspension mechanism for side drilling in hard formations provided by the present invention, the area of the second frame located between the second connecting assembly and the first frame is an arcuate surface, and the arcuate surface is used to fit with the inner side surface of the top end of the bevel.

[0007] According to the one-trip delivery suspension mechanism for side drilling in hard formations provided by the present invention, the first frame is a rectangular parallelepiped structure.

[0008] According to the one-trip delivery suspension mechanism for sidetracking in hard formations provided by the present invention, the first connecting assembly includes: A plug-in protrusion, one end of which is connected to the first frame, and the other end of which extends in a direction away from the first frame, wherein the plug-in protrusion is used to be inserted into the milling cone, and a shear surface is provided at a connection position between the plug-in protrusion and the first frame; A radial limiting structure for limiting the radial movement of the plug-in protrusion along the milling cone According to the one-trip delivery suspension mechanism for side drilling in hard formations provided by the present invention, the radial limiting structure includes a slot and a pin shaft. The slot is arranged on a side of the first frame away from the second frame, and the extension direction of the slot is perpendicular to the extension direction of the first frame and the second frame. The pin shaft is used to be inserted into the slot.

[0009] According to the one-trip delivery suspension mechanism for sidetracking in hard formations provided by the present invention, the second connecting assembly includes: a connecting rod, one end of which is connected to the second frame, the other end of which extends away from the second frame, and the outer side of which is provided with a first external thread; A locking ring, wherein the inner side of the locking ring is provided with an internal thread for cooperating with the first external thread, and the outer side of the locking ring is provided with a second external thread for connecting with the connecting hole of the whipstock.

[0010] The present invention has the following advantages due to the adoption of the above technical solution: The one-trip delivery suspension mechanism for side drilling in hard formations provided by the present invention includes a frame, a first connecting assembly and a second connecting assembly. The frame includes a first frame and a second frame connected to each other, and the angle between the extension direction of the first frame and the extension direction of the second frame is an obtuse angle. The first connecting assembly is arranged at an end of the first frame away from the second frame, and is located on a side close to the inner side of the obtuse angle, and the first connecting assembly is used for detachable connection with the side of the milling cone. The second connecting assembly is arranged at an end of the second frame away from the first frame, and is located on a side close to the outer side of the obtuse angle, and the second connecting assembly is used for detachable connection with the inner side surface of the top end of the bevel. When in use, the first connecting component is connected to the side of the milling cone, and the second connecting component is connected to the inner side of the top of the bevel. Since the angle between the first frame and the second frame is an obtuse angle, and the second connecting component is arranged on the outside of the obtuse angle, and the first connecting component is arranged on the inside of the obtuse angle, after the connection, the axis of the bevel and the milling cone can be made collinear, and the frame, the first connecting component and the second connecting component are all located in the projection area of the milling cone, which solves the problem in the related technology that after the bevel is connected to the milling cone by shear bolts, the outer diameter of the connecting body will exceed the outer diameter of the milling cone, resulting in the inability to be lowered in one trip. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a front view of a one-trip delivery suspension mechanism for sidetracking in hard formations provided by one embodiment of the present invention; Figure 2 It is a cross-sectional view of a one-trip feeding suspension mechanism for sidetracking in hard formations provided by one embodiment of the present invention; Figure 3 This is a bottom view of a one-trip feeding suspension mechanism for sidetracking in hard formations provided by one embodiment of the present invention; Figure 4 It is a schematic diagram of the connection structure of a milling cone, a hard formation side drilling one-trip delivery suspension mechanism, a whipstock and an anchor provided by one embodiment of the present invention.

[0013] Reference numerals: 110: first frame; 120: second frame; 121: arcuate surface; 210: plug-in protrusion; 220: slot; 230: pin; 310: connecting rod; 320: locking ring; 400: milling cone; 500: bevel device; 600: anchor. DETAILED DESCRIPTION

[0014] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0016] Furthermore, 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0017] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0018] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0019] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0020] The one-trip delivery suspension mechanism for side drilling in hard formations provided by the present invention includes a frame, a first connecting assembly and a second connecting assembly. The frame includes a first frame and a second frame connected to each other, and the angle between the extension direction of the first frame and the extension direction of the second frame is an obtuse angle. The first connecting assembly is arranged at an end of the first frame away from the second frame, and is located on a side close to the inner side of the obtuse angle, and the first connecting assembly is used for detachable connection with the side of the milling cone. The second connecting assembly is arranged at an end of the second frame away from the first frame, and is located on a side close to the outer side of the obtuse angle, and the second connecting assembly is used for detachable connection with the inner side surface of the top end of the bevel. When in use, the first connecting component is connected to the side of the milling cone, and the second connecting component is connected to the inner side of the top of the bevel. Since the angle between the first frame and the second frame is an obtuse angle, and the second connecting component is arranged on the outside of the obtuse angle, and the first connecting component is arranged on the inside of the obtuse angle, after the connection, the axis of the bevel and the milling cone can be made collinear, and the frame, the first connecting component and the second connecting component are all located in the projection area of the milling cone, which solves the problem in the related technology that after the bevel is connected to the milling cone by shear bolts, the outer diameter of the connecting body will exceed the outer diameter of the milling cone, resulting in the inability to be lowered in one trip.

[0021] The following combination Figures 1 to 4 The present invention is described as a one-trip delivery suspension mechanism for sidetracking in hard formations.

[0022] An embodiment of the present invention provides a one-trip delivery suspension mechanism for side drilling in hard formations, comprising a frame, a first connecting assembly, and a second connecting assembly.

[0023] The frame includes a first frame 110 and a second frame 120 connected to each other. The angle between the extending direction of the first frame 110 and the extending direction of the second frame 120 is an obtuse angle.

[0024] For example, see Figure 1 When the frame is placed horizontally, the first frame 110 can be located on the right side of the second frame 120, and the first frame 110 extends in the horizontal direction, and the second frame 120 extends to the left and upward.

[0025] The first connecting assembly is disposed at one end of the first frame 110 away from the second frame 120 and located on a side close to the inner side of the obtuse angle. The first connecting assembly is used for detachable connection with the side surface of the milling cone 400 .

[0026] For example, see Figure 1 The first connecting component can be set on the top surface of the right side of the first frame 110, and the first connecting component is used to be detachably connected to the bottom side of the milling cone 400.

[0027] The second connecting assembly is disposed at an end of the second frame 120 away from the first frame 110 and located on a side close to the outside of the obtuse angle. The second connecting assembly is used for detachable connection with the top inner side surface of the whipstock 500 .

[0028] For example, see Figure 1 The second connecting component can be set on the left bottom surface of the second frame 120, and the second connecting component is used to be detachably connected to the top inner side surface of the whipstock 500.

[0029] Because the second frame 120 extends obliquely leftward and upward, the longitudinal distance between the first and second connecting assemblies is reduced, bringing them closer to the horizontal axis of the first frame 110. This allows the axes of the milling cone 400 and the whipstock 500 to be aligned when the first connecting assembly is connected to the milling cone 400 and the second connecting assembly is connected to the whipstock 500. Furthermore, the whipstock 500, frame, first and second connecting assemblies can all be positioned within the axial projection of the milling cone 400.

[0030] In the related art, after the bevel 500 is connected to the milling cone 400 by means of shear bolts, the outer diameter of the connecting body will exceed the outer diameter of the milling cone 400, resulting in the inability to be lowered in one trip. However, the one-trip suspension mechanism for side drilling of hard formations provided in the present application has the bevel 500 and the milling cone 400 collinear, and the bevel 500, the frame, the first connecting assembly and the second connecting assembly are all located within the axial projection area of the milling cone 400, so that the milling cone 400, the bevel 500 and the anchor 600 can be lowered in one trip.

[0031] In some embodiments, the area of the second frame 120 located between the second connecting assembly and the first frame 110 is a curved surface 121 , and the curved surface 121 is configured to fit with the inner side surface of the top end of the whipstock 500 .

[0032] See Figure 1 and Figure 4The inner side surface of the whipstock 500 is an arcuate surface 121, and the inner side surface of the whipstock 500 extends downward and tilted toward the axis. Therefore, the bottom surface of the second frame 120 near the first frame 110 is set as the arcuate surface 121, and the arcuate surface 121 is in contact with the top of the inner side surface of the whipstock 500.

[0033] In some embodiments, the first frame 110 may be a rectangular parallelepiped structure.

[0034] In some embodiments, the first connecting component includes a plug-in protrusion 210 and a radial limiting structure.

[0035] See Figure 1 The plug-in protrusion 210 is provided on the right side of the top of the first frame 110, and the bottom end of the plug-in protrusion 210 is connected to the first frame 110, and the top end of the plug-in protrusion 210 extends vertically upward. When connected, the plug-in protrusion 210 is used to insert into the connecting groove on the outer side of the milling cone 400. After insertion, the bottom surface of the first frame 110 is located within the axial projection area of the milling cone 400. A shear surface is provided at the connection position between the plug-in protrusion 210 and the first frame 110, which is used to press down the pipe column and shear the suspension mechanism when feeding in one trip, and the milling cone 400 starts to side-drill and open a window.

[0036] The radial limiting structure is provided between the plug-in protrusion 210 and the milling cone 400 . During the feeding process, the radial limiting structure is used to limit the radial movement of the plug-in protrusion 210 along the milling cone 400 .

[0037] In some embodiments, the radial limiting structure includes a slot 220 and a pin 230. The slot 220 is arranged on the side of the first frame 110 away from the second frame 120 and can be located on the plug-in protrusion 210. The extension direction of the slot 220 is perpendicular to the extension direction of the first frame 110 and the second frame 120, and the inner diameter of the slot 220 is equal to the outer diameter of the pin 230. The pin 230 is used to be inserted into the slot 220.

[0038] When the plug-in protrusion 210 is connected to the milling cone 400, the movement of the plug-in protrusion 210 along the axial direction of the milling cone 400 is restricted. At this time, inserting the pin shaft 230 into the slot 220 can limit the radial movement of the plug-in protrusion 210 along the milling cone 400, and place the plug-in protrusion 210 and the milling cone 400 apart.

[0039] In some embodiments, the second connecting assembly includes a connecting rod 310 and a locking ring 320, one end of the connecting rod 310 is connected to the second frame 120, and the other end of the connecting rod 310 extends away from the second frame 120, the outer side of the connecting rod 310 is provided with a first external thread, the inner side of the locking ring 320 is provided with an internal thread for cooperating with the first external thread, and the outer side of the locking ring 320 is provided with a second external thread for connecting to the connecting hole of the bevel 500.

[0040] For details, see Figure 1 and Figure 2 The connecting rod 310 is located at the bottom of the left end of the second frame 120. The top of the connecting rod 310 is connected to the second frame 120, and the bottom extends vertically downward. In this way, the connection directions of the connecting rod 310 and the plug-in protrusion 210 are parallel to each other, so that the axes of the milling cone 400 and the bevel device 500 are collinear.

[0041] A first external thread is provided on the outside of the connecting rod 310, and an internal thread is provided on the inside of the locking ring 320, so that the locking ring 320 can be threadedly connected to the bottom end of the connecting rod 310. A second external thread is provided on the outside of the locking ring 320, and a connecting hole for connecting to the locking ring 320 is provided on the inner side of the whipstock 500. The connecting hole is provided with an internal thread, realizing a threaded connection between the locking ring 320 and the connecting hole.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A one-trip feeding suspension mechanism for side drilling in hard formations, characterized in that: include: A frame, comprising a first frame (110) and a second frame (120) connected to each other, wherein an angle between an extension direction of the first frame (110) and an extension direction of the second frame (120) is an obtuse angle; A first connecting component is provided at one end of the first frame (110) away from the second frame (120) and located on a side close to the inner side of the obtuse angle, the first connecting component being used for detachable connection to the side surface of the milling cone (400); A second connecting component is provided at an end of the second frame (120) away from the first frame (110) and located on a side close to the outside of the obtuse angle, the second connecting component being used for detachably connecting to the inner side surface of the top end of the whipstock (500); When the first connecting component is connected to the milling cone (400) and the second connecting component is connected to the bevel (500), the axes of the milling cone (400) and the bevel (500) are collinear, and the frame, the first connecting component and the second connecting component are all located within the axial projection area of the milling cone (400).

2. The one-trip feeding suspension mechanism for side drilling in hard formations according to claim 1 is characterized in that: The area of the second frame (120) located between the second connecting component and the first frame (110) is an arcuate surface (121), and the arcuate surface (121) is used to fit with the inner side surface of the top end of the whipstock (500).

3. The one-trip feeding suspension mechanism for side drilling in hard formation according to claim 1 is characterized in that: The first frame (110) is a rectangular parallelepiped structure.

4. The one-trip feeding suspension mechanism for side drilling in hard formations according to claim 1 is characterized in that: The first connection component includes: A plug-in protrusion (210), one end of the plug-in protrusion (210) is connected to the first frame (110), the other end of the plug-in protrusion (210) extends in a direction away from the first frame (110), the plug-in protrusion (210) is used to be inserted into the milling cone (400), and a shear surface is provided at a connection position between the plug-in protrusion (210) and the first frame (110); A radial limiting structure is provided, wherein the radial limiting structure is used to limit the radial movement of the plug-in protrusion (210) along the milling cone (400).

5. The one-trip feeding suspension mechanism for side drilling in hard formations according to claim 4 is characterized in that: The radial limiting structure comprises a slot (220) and a pin (230), wherein the slot (220) is arranged on a side of the first frame (110) away from the second frame (120), and an extension direction of the slot (220) is perpendicular to an extension direction of the first frame (110) and the second frame (120), and the pin (230) is used to be inserted into the slot (220).

6. The one-trip feeding suspension mechanism for side drilling in hard formations according to claim 1 is characterized in that: The second connection component includes: a connecting rod (310), one end of the connecting rod (310) being connected to the second frame (120), the other end of the connecting rod (310) extending in a direction away from the second frame (120), and a first external thread being provided on the outer side of the connecting rod (310); A locking ring (320) is provided on its inner side with an internal thread for mating with the first external thread, and on its outer side with a second external thread for connecting with the connection hole of the whipstock (500).

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