Well wall coring lead screw type rock core pressing device for well logging

Abstract

The utility model relates to the field of petroleum and natural gas exploration equipment, in particular to a well wall coring lead screw type rock core pressing device for well logging. Comprising a base and supporting plates arranged on the base, a connecting rod used for supporting is arranged between the supporting plates, a connecting sleeve sliding plate is arranged on the connecting rod, one end of the connecting sleeve sliding plate is connected with an ejector rod, the other end of the connecting sleeve sliding plate is connected with a lead screw sleeve, the lead screw sleeve is connected with a lead screw, the lead screw is movably connected with a manual part, and the other end of the ejector rod is inserted into a rock core barrel. A core supporting plate is arranged at the bottom of the core barrel. According to the device, the screw rod is driven to rotate through the manual part, so that the screw rod sleeve drives the ejector rod to move, a rock core in the rock core barrel can be pushed out, and the integrity of the rock core is ensured in the whole process, so that the original characteristics and the researchability of a rock core sample are reserved to a greater extent, and a basis is provided for subsequent researches such as geological analysis and rock mechanics.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas exploration equipment, in particular to a well wall coring screw type core pressing device for well logging. Background Art

[0002] Sidewall coring is a crucial operation in oil and gas exploration. Sidewall coring involves removing formation rock samples from the drilled wellbore wall at a predetermined depth using a sidewall coring tool, typically performed after logging. The purpose of sidewall coring is to verify the lithology, physical properties, oil content, and the relationship between lithology and electrical properties of the formation, or to meet specific geological requirements. Sidewall coring is widely used in oil and gas exploration sites because it allows direct access to rock from underground using a coring tool. It is intuitive, simple, and economical, making it a practical and cost-effective method. Sidewall coring tools typically have more than 30 holes (e.g., 36 holes) filled with explosives. These holes are connected to surface equipment via cables, where the coring depth is controlled, ignited, and fired. After ignition, the lateral thrust of the explosives forces the core barrel into the wellbore wall. The core barrel is then connected to the coring tool by a wireline, and the tool is pulled up to retrieve the rock sample from the formation. When sidewall coring samples are brought out of the wellhead, operators remove individual core barrels one by one and place them into prepared paper bags. As the cores are removed from the barrels, the depth is immediately marked to prevent confusion. Care must be taken to avoid breaking the cores during removal, maintaining their integrity as much as possible. Failure to do so will require notification to the logging team for re-collection, resulting in significant financial losses.

[0003] Chinese patent application number 201420037586.4, titled "Well Wall Coring and Sample Extraction Platform," discloses a core hammer, a lance and hand-held rod, a mud shield, a core cup, a chassis, a core slide, a core connection channel, and three support rods, among which...; The aforementioned patent suffers from the following two issues: 1. After the core barrel is fired and violently impacts the well wall, the threaded connection between the base and the barrel becomes too tight. There is no dedicated method for disassembling the core barrel base on-site, and the only method for loosening it is by tapping or vibrating. This process shatters the core, causing some rock chips to fly out of the core barrel and be lost; 2. Some dense cores are tightly embedded in the core barrel. Using a core hammer to strike the lance results in a violent impact that shatters the core sample, resulting in a crushed core sample. Utility Model Content

[0004] The purpose of this utility model is to provide a screw-type core pressing device for well logging. Through the screw thread transmission, the torque is amplified to apply a sufficiently large, continuous and stable thrust to the core in the core barrel, thereby removing the complete core. At the same time, it provides a function to twist the core barrel base thread if the core barrel base thread is too tight.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a screw-type core pressing device for well logging coring, comprising a base and a support plate arranged on the base, a connecting rod for support provided between the support plates, a connecting sleeve sliding plate provided on the connecting rod, one end of the connecting sleeve sliding plate is connected to a push rod, and the other end is connected to a screw sleeve, wherein the screw sleeve is connected to a screw rod, and the screw rod is movably connected to a manual part, wherein the other end of the push rod is inserted into a core barrel, and a core supporting plate is provided at the bottom of the core barrel.

[0007] As a further improvement, the connecting sleeve sliding plate and the screw sleeve are detachably connected via pins.

[0008] As a further improvement, one end of the ferrule is connected to the screw sleeve, and the other end of the ferrule is in contact with and connected to the ejector rod.

[0009] As a further improvement, an inner hexagonal screw sleeve is provided at one end of the screw sleeve away from the connecting sleeve sliding plate, and the inner hexagonal screw sleeve is adapted to the outer hexagonal screw sleeve provided on the screw rod, so that the screw rod can drive the screw sleeve to rotate.

[0010] As a further improvement, the manual part includes a hand-cranked wheel, and the hand-cranked wheel is connected to the screw rod through a matching screw and nut.

[0011] As a further improvement, the screw rod and the support plate are connected via a copper sleeve, and a thrust bearing is also provided between the screw rod and the support plate.

[0012] As a further improvement, the connecting rod is further provided with a copper sliding sleeve, and the copper sliding sleeve is provided with a retaining spring.

[0013] As a further improvement, a spare ferrule is also provided on the support plate.

[0014] As a further improvement, a second flat washer and a second spring washer are provided between the connecting rod and the support plate, and are locked together by a fastening nut.

[0015] As a further improvement, the base includes an angle iron, which is connected to the support plate via a first bolt, and a first flat washer and a first spring washer are provided between the first bolt and the angle iron.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The device drives the screw to rotate through a manual part, so that the screw sleeve drives the push rod to move, and the core in the core barrel can be pushed out. The whole process ensures the integrity of the core, thereby preserving the original characteristics and researchability of the core sample to a greater extent, and provides a basis for subsequent geological analysis, rock mechanics and other research. At the same time, the device can, during the process of removing the base of the core barrel, address the problem of over-tight thread engagement by rotating the screw, driving the screw sleeve and the ferrule to rotate, so as to remove the base of the core barrel. The whole process is simple and convenient, reduces the difficulty of operation, and avoids the core being shattered when loosening the thread by knocking and vibrating, thereby further protecting the integrity of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a top view of the overall structure of the utility model;

[0020] Figure 3 This is a structural diagram of Example 2 of the present utility model;

[0021] Figure 4 This is a top view of the structure of Example 2 of the present utility model;

[0022] Figure 5 This is a schematic diagram of the screw rod of the utility model;

[0023] Figure 6 This is a schematic diagram of the screw sleeve of the utility model.

[0024] Reference numerals: 1, hand wheel; 2, screw; 3, washer; 4, nut; 5, copper sleeve; 6, thrust bearing; 7, screw rod; 8, screw rod sleeve; 9, connecting rod; 10, connecting sleeve sliding plate; 11, pin; 12, ferrule; 13, copper sliding sleeve; 14, steel plate; 15, core barrel support plate; 16, core barrel; 17, φ14 push rod; 18, core support plate; 19, first support plate; 20, φ23 Push rod; 21. Retaining ring; 22. First bolt; 23. First flat washer; 24. First spring washer; 25. Angle iron; 26. Second support plate; 27. Fastening nut; 28. φ18 push rod; 29. ​​Second spring washer; 30. Second flat washer; 31. Core barrel base; 32. External hexagonal screw; 33. External thread; 34. Internal hexagonal screw sleeve; 35. Internal thread; 36. Spare ferrule. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all variations, modifications, and equivalents that fall within the spirit and scope of the appended claims.

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] like Figure 1 As shown, the utility model is a well logging coring screw type core pressing device, including a base and a support plate arranged on the base, a connecting rod 9 for support is provided between the support plates, a connecting sleeve sliding plate 10 is provided on the connecting rod 9, one end of the connecting sleeve sliding plate 10 is connected to the push rod 17, and the other end is connected to the screw sleeve 8, wherein the screw sleeve 8 is connected to the screw 7, and the screw 7 is movably connected to the manual part, wherein the other end of the push rod 17 is connected to the core barrel 16, and a core support plate 18 is provided at the bottom of the core barrel 16. Figure 1 and Figure 2 As shown, the base in the embodiment is used to support the entire device, and a symmetrical first support plate 19 and a second support plate 26 are respectively provided at the left and right ends of the base, and the support plates are detachably connected to the base; Figure 1 As shown, the device is preferably provided with four connecting rods 9, which are arranged in a quadrilateral between two support plates, and components such as screw rod 7, screw rod sleeve 8, core barrel 16, connecting sleeve sliding plate 10 are arranged between the connecting rods 9.

[0029] Figure 2 As shown, one end of the screw rod 7 passes through the second support plate 26 and is connected to the manual member provided on the other side of the second support plate 26, and the other end is connected to the screw rod sleeve 8, as shown in FIG. Figure 5 and Figure 6 As shown, the screw rod 7 is provided with an outer hexagonal screw rod 32, which is adapted to the inner hexagonal screw rod 34 in the screw rod sleeve 8, and can ensure that the screw rod 7 extends into the screw rod sleeve 8 and is limited. The left end of the outer hexagonal screw rod 32 is connected to the manual part through the hole provided on the second support plate 26, wherein a thrust bearing 6 is provided between the outer hexagonal screw rod 32 and the second support plate 26 for bearing the axial load of the screw rod 7, and a copper sleeve 5 is provided in the hole on the second support plate 26 for reducing friction, transmitting thrust and playing a supporting and fixing role; the right end of the screw rod 7 is provided with an external thread 33, which matches the internal thread 35 in the screw rod sleeve 8.

[0030] In the embodiment, the push rod 17 is provided with a variety of different specifications, corresponding to the core barrel 16 of different specifications. For example, the push rod 17 of this embodiment is a φ14 push rod, the push rod 20 is a φ23 push rod, and the push rod 28 is a φ18 push rod. Push rods of different specifications can be selected according to specific usage requirements.

[0031] In the embodiment, the connecting sleeve sliding plate 10 and the screw sleeve 8 are detachably connected by a pin 11. The size of the connecting sleeve sliding plate 10 is larger than the screw sleeve 8, so the connecting sleeve sliding plate 10 is sleeved on the screw sleeve 8. After installation, the pin 11 passes through the connecting sleeve sliding plate 10 and the screw sleeve 8 to connect the two.

[0032] In the embodiment, a ferrule 12 is provided in the connecting sleeve sliding plate 10, one end of the ferrule 12 is connected to the screw sleeve 8, and the other end is in contact with the push rod 17. The two functional modes of this device are realized based on the connection of the ferrule 12. When the ferrule 12 is connected to the push rod 17, the core pressing mode can be realized. When the ferrule 12 is connected to the core barrel base 31, the core barrel base 31 disassembly mode can be realized.

[0033] The manual part includes a hand-crank wheel 1, which is connected to the screw rod 7 by a screw 2 and a nut 4. The hand-crank wheel 1 can drive the screw rod 7 to rotate, thereby driving the screw rod sleeve 8 to move forward and backward. Figure 1 As shown, a pad 3 is provided between the screw rod 7 and the hand-cranked wheel 1 , and the screw 2 passes through the pad 3 and the nut 4 to connect the screw rod 7 to the hand-cranked wheel 1 .

[0034] The connecting rod 9 is also provided with a copper sleeve 13, and the copper sleeve 13 is provided with a retaining spring 21. The copper sleeve 13 provided in the embodiment can reduce the connection friction between the connecting rod 9 and the support plate. The retaining spring 21 can clamp the copper sleeve 13 on the connecting rod 9 and tighten the copper sleeve 13.

[0035] The support plate is also provided with a spare ferrule 36. The spare ferrule 36 installed on the support plate in the embodiment is used to replace the ferrule 12 and plays a spare role.

[0036] A second flat washer 30 and a second spring washer 29 are provided between the connecting rod 9 and the support plate, and are locked together by a fastening nut 27. The base includes an angle iron 25, on which a layer of steel plate 14 is provided for reinforcement. The angle iron 25 is connected to the support plate by a first bolt 22, and a first flat washer 23 and a first spring washer 24 are provided between the first bolt 22 and the angle iron 25.

[0037] The process of using this device is to first fix the screw sleeve 8 and the connecting sleeve sliding plate 10 together with the pin 11, turn the hand crank 1 counterclockwise to drive the screw 7 to rotate, and through the external thread 33 on the screw 7 and the internal thread 35 on the screw sleeve 8, the screw sleeve 8 moves to the left, thereby driving the connected connecting sleeve sliding plate 10, pin 11, and push rod 17 to retreat to the left together; place the core barrel 16 on the core barrel support plate 15, turn the crank handle clockwise to drive the screw 7 to rotate , through the external thread 33 on the screw rod 7 and the internal thread 35 on the screw rod sleeve 8, the screw rod sleeve 8 moves to the right, thereby driving the connected connecting sleeve sliding plate 10, pin 11, and push rod 17 to move to the right together. When the push rod 17 is inserted into the core barrel 16, the core in the core barrel 16 will be pushed out, and the core will fall on the core supporting plate 18. The hand crank wheel 11 is rotated counterclockwise again to withdraw the push rod 17 in the core barrel 16 and take out the core barrel 16, thus completing a core pressing operation.

[0038] Example 2

[0039] This embodiment is basically the same as embodiment 1, except that this embodiment proposes a mode for disassembling the core barrel base. Figure 3 and Figure 4 After the inner thread 35 and the outer thread 33 are completely disengaged, the screw sleeve 8 is pushed leftward by hand so that the inner hexagonal portion 34 of the screw sleeve is sleeved on the outer hexagonal portion 32 of the screw shaft, and the core barrel 16 is placed inside the connecting sleeve sliding plate 10, and the pin 11 is inserted into the through holes of the connecting sleeve sliding plate 10 and the core barrel 16 to fix the two, and the connecting sleeve sliding plate 10 is pushed leftward to drive the core barrel base 31 to be connected to the ferrule 12 to the left, and the hand wheel is rotated clockwise to drive the screw rod 7, the screw rod sleeve 8, the ferrule 12 and the core barrel base 31 to rotate, and the thread between the core barrel 16 and the core barrel base 31 is turned off, and the core barrel base operation can be completed.

[0040] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0042] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations 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 any one or more embodiments or examples.

[0043] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A well logging coring screw type core pressing device, characterized in that: It includes a base and a support plate arranged on the base, a connecting rod for support is provided between the support plates, a connecting sleeve sliding plate is provided on the connecting rod, one end of the connecting sleeve sliding plate is connected to the push rod, and the other end is connected to the screw sleeve, wherein the screw sleeve is connected to the screw, and the screw is movably connected to the manual part, wherein the other end of the push rod is inserted into the core barrel, and a core support plate is provided at the bottom of the core barrel.

2. A sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: The connecting sleeve sliding plate and the screw rod sleeve are detachably connected via pins.

3. A sidewall coring screw type core pressing device for well logging according to claim 2, characterized in that: A clamping sleeve is provided in the connecting sleeve sliding plate, one end of the clamping sleeve is connected to the screw sleeve, and the other end of the clamping sleeve is in contact with and connected to the ejector rod.

4. The well logging screw core pressing device according to claim 1, characterized in that: An inner hexagonal screw sleeve is provided at one end of the screw sleeve away from the connecting sleeve sliding plate. The inner hexagonal screw sleeve is adapted to the outer hexagonal screw sleeve provided on the screw rod, so that the screw rod can drive the screw sleeve to rotate.

5. The well logging screw core pressing device according to claim 1, characterized in that: The manual part includes a hand-cranked wheel, and the hand-cranked wheel is connected to the screw rod through a matching screw nut.

6. The sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: The screw rod and the support plate are connected via a copper sleeve, and a thrust bearing is also provided between the screw rod and the support plate.

7. The sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: The connecting rod is also provided with a copper sliding sleeve, and the copper sliding sleeve is provided with a retaining spring.

8. The sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: The support plate is also provided with a spare ferrule.

9. The sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: A second flat washer and a second spring washer are provided between the connecting rod and the supporting plate, and are locked and connected by a fastening nut.

10. The sidewall coring screw type core pressing device for well logging according to claim 1, characterized in that: The base includes an angle iron, which is connected to the support plate via a first bolt, and a first flat washer and a first spring washer are provided between the first bolt and the angle iron.

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