Casing float collar device for petroleum well cementation

Abstract

The utility model relates to the technical field of well cementation, and discloses a casing float collar device for petroleum well cementation, which comprises a casing, connecting pipes symmetrically arranged at the two ends of the casing and a movable mechanism arranged on the inner side wall of the casing, and is characterized in that a fixing assembly is arranged on the outer side wall of the casing and comprises a through hole, a through hole and a through hole, two ends of the sleeve are symmetrically arranged on the outer side walls of the two ends of the sleeve; the internal thread groove body is connected into the through hole through a bearing and is in threaded connection with a threaded rod; the sliding blocks are symmetrically connected to the outer side wall of the threaded rod; the first sliding grooves are symmetrically formed in the through hole and are in sliding connection with the sliding block. The first hole groove is formed in the surface of the connecting pipe and connected with the inner end of the threaded rod in a clamped mode. The first clamping blocks are symmetrically arranged on the inner side walls of the two ends of the sleeve in pairs. The first clamping grooves are symmetrically formed in the end face of the connecting pipe and connected with the first clamping block in a clamped mode. A locking assembly is arranged at the end, away from the threaded rod, of the inner threaded groove body. According to the casing float collar device for petroleum well cementation, the internal thread groove body is locked through the locking assembly, and rotation of the internal thread groove body is prevented.

Description

Technical Field

[0001] The utility model relates to a downhole tool for oil exploration, in particular to a casing floating collar device for oil cementing, belonging to the technical field of oil cementing tools. Background Art

[0002] During cementing operations, a float collar is connected to the lower end of the casing string. Its performance directly impacts cementing quality; damage can lead to serious cement slurry reinjection accidents. A casing coupling equipped with a check valve is a casing accessory. It can be used in conjunction with a casing float shoe in deep and specialized wells to improve cementing safety. During casing running, it enables unidirectional flow of drilling fluid into the annulus, preventing cement slurry backflow during cementing. It also allows for post-cementing pressure relief and subsequent setting, helping to improve the bond between the cement sheath and casing. Furthermore, by injecting drilling fluid into the casing string to adjust its buoyancy, the casing's suspended weight meets the design requirements for running the casing.

[0003] The Chinese utility model patent with the announcement number CN213063525U discloses a casing floating collar device for cementing, including a casing and a connecting pipe. The number of connecting pipes is two, and the two connecting pipes are respectively arranged at the two ends of the two casings; the top and bottom of the casing and on both sides of the surface of the two connecting pipes are provided with fixing components. The fixing component includes an installation cavity, and the interior of the casing and the top and bottom of the inner wall of the installation cavity are provided with second slide grooves. The interior of the two second slide grooves is slidably connected to a second slider, and one side of the two second sliders is fixedly connected to a movable plate. A threaded bolt is provided between the two movable plates through a fixed block, and the interior of the connecting pipe is provided with a threaded groove adapted to the threaded bolt.

[0004] This technical solution has the following shortcomings: in order to achieve the threaded connection between the threaded bolt and the threaded groove and thus fix the connecting sleeve and the connecting pipe, it is necessary to first push the threaded bolt in the mounting cavity inside the sleeve toward one side of the connecting pipe, but the mounting cavity is relatively narrow and difficult to enter by hand, making it inconvenient to rotate the threaded bolt into the threaded groove. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0007] The purpose of the utility model is to provide a casing floating collar device for oil well cementing, which has the advantage of being easy for users to fix the casing and the connecting pipe, and solves the problem that in order to achieve the threaded connection between the threaded bolt and the threaded groove and thus fix the connecting casing and the connecting pipe, it is necessary to first push the threaded bolt in the installation cavity inside the casing to move toward one side of the connecting pipe, but the installation cavity is relatively narrow and difficult to enter by hand, making it inconvenient to rotate the threaded bolt to make it enter the threaded groove.

[0008] In order to solve the above technical problems, the present invention provides a casing floating collar device for oil well cementing, comprising a casing, connecting pipes symmetrically arranged at both ends of the casing, and a movable mechanism arranged on the inner side wall of the casing. The outer side wall of the casing is provided with a fixing assembly, and the fixing assembly includes:

[0009] Through holes are symmetrically arranged in pairs on the outer side walls at both ends of the sleeve;

[0010] An internal threaded groove body is connected to the through hole via a bearing and is threadedly connected to a threaded rod;

[0011] A slider symmetrically connected to the outer side wall of the threaded rod;

[0012] A first slide groove is symmetrically arranged in the through hole and is slidably connected to the slider;

[0013] A first hole groove is formed on the surface of the connecting pipe and is engaged with the inner end of the threaded rod;

[0014] The first clamping blocks are symmetrically arranged on the inner side walls of both ends of the sleeve;

[0015] A first clamping groove is symmetrically formed on the end surface of the connecting pipe and is clamped with the first clamping block;

[0016] A locking assembly is provided at one end of the internal thread groove away from the threaded rod.

[0017] Furthermore, the locking assembly includes:

[0018] a circular groove, formed on the outer wall of the sleeve and connected to the through hole;

[0019] A circular block is provided on the outer side wall of one end of the internal thread groove away from the threaded rod;

[0020] A second chute is symmetrically arranged on the outer side wall of the circular block;

[0021] an elastic member, disposed in the second slide groove and connected to the second clamping block;

[0022] The second card slots are symmetrically and evenly arranged on the inner side wall of the circular slot and matched with the second card block;

[0023] A block body is provided on the outer side wall of the second clamping block away from the internal thread groove body;

[0024] A notch is provided on the outer side wall of the circular block and is slidably connected to the block.

[0025] Furthermore, the outer wall of the connecting pipe and the inner wall of the sleeve are both symmetrically provided with a second hole groove, and magnetic blocks that attract each other are arranged in the second hole groove.

[0026] Furthermore, one end of the second clamping block that is clamped with the second clamping slot is a cone.

[0027] Furthermore, an anti-slip pad is provided on the outer side wall of the block.

[0028] Furthermore, the outer side wall of the anti-slip pad is provided with anti-slip grooves.

[0029] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The casing floating collar device for oil cementing is provided with a fixing assembly between the casing and the connecting pipe, and the threaded rod and the hole groove 1 are docked by a clamping block 1 and a clamping groove 1, and the internal threaded groove body is rotated by a locking assembly, so that the threaded rod is clamped with the hole groove 1 under the restriction of the slider and the slide groove 1, and then the internal threaded groove body is locked by the locking assembly to prevent it from rotating.

[0030] 2. The casing floating collar device for oil well cementing has a second slot with a built-in magnetic block formed on the inner wall of the casing and the outer wall of the connecting pipe. The mutual attraction of the magnetic blocks facilitates the user to connect the first clamping block with the first clamping slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. The drawings are only provided for reference and explanation, and are not intended to limit the present invention. Among them:

[0032] Figure 1 This is a structural diagram of a casing floating collar device for oil well cementing according to the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of the sleeve and the connecting pipe in the utility model;

[0034] Figure 3 This is an enlarged schematic diagram of the structure of area A in the present utility model;

[0035] Figure 4 This is an enlarged schematic diagram of the structure of area B in the present utility model;

[0036] Figure 5It is a side view structural diagram of the block and the gap in the utility model;

[0037] In the figure: 1. casing;

[0038] 2. Connecting pipe;

[0039] 3. Activity organization;

[0040] 4. Fixing assembly; 41. Through hole; 42. Internal thread groove; 43. Threaded rod; 44. Slider; 45. Slide groove 1; 46. Hole groove 1; 47. Block 1; 48. Slot 1;

[0041] 5. Locking assembly; 51. Circular groove; 52. Circular block; 53. Second slide groove; 54. Elastic member; 55. Second clamping block; 56. Second clamping groove; 57. Block; 58. Notch;

[0042] 6. Hole slot 2;

[0043] 7. Magnetic block;

[0044] 8. Anti-slip mat. DETAILED DESCRIPTION

[0045] In the following description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0046] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the embodiments described are only a part of the present invention, not all of the embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Example

[0048] like Figures 1 to 4 As shown, the casing floating collar device for oil cementing of the present invention includes a casing 1, connecting pipes 2 symmetrically arranged at both ends of the casing 1, and a movable mechanism 3 arranged on the inner wall of the casing 1. The connecting pipes 2 are respectively fixed to the two ends of the casing 1. The movable mechanism 3 on the inner wall of the casing 1 facilitates the blocking of cement, which can increase the speed when injecting cement and prevent the degradation of cementing quality caused by long-term use.

[0049] A fixing assembly 4 is provided on the outer wall of the sleeve 1, and the fixing assembly 4 includes: through holes 41, which are symmetrically opened in pairs on the outer walls of both ends of the sleeve 1; an internal threaded groove body 42, a bearing is connected to the through hole 41 and is threadedly connected to a threaded rod 43; a slider 44, symmetrically arranged on the outer wall of the threaded rod 43; a slide groove 45, symmetrically opened in the through hole 41 and slidably connected to the slider 44; a hole groove 46, opened on the surface of the connecting pipe 2 and clamped with the threaded rod 43; a clamping block 47, symmetrically arranged in pairs on the inner walls of both ends of the sleeve 1; a clamping groove 48, symmetrically opened on the end face of the connecting pipe 2 and clamped with the clamping block 47; a locking assembly 5 is provided on the end of the internal threaded groove body 42 away from the threaded rod 43.

[0050] When it is necessary to fix the two ends of the connecting pipe 2 and the sleeve 1 together, first, insert one end of the connecting pipe 2 into one end of the sleeve 1 until the block 1 47 touches the bottom of the connecting pipe 2 and the block 1 47 is locked into the groove 1 48. At this time, the connecting pipe 2 can no longer be rotated, so that the connecting pipe 2 is initially fixed; secondly, unlock and rotate the locking component 5, so that the locking component 5 drives the internal thread groove body 42 to rotate in the through hole 41, and the internal thread groove body 42 drives the threaded rod 43 threadedly connected thereto to rotate between the slider 44 and the slide groove 1 45 is restricted and moves into the through hole 41, so that the threaded rod 43 is opposite to the hole groove 1 46, and the locking component 5 is rotated in the opposite direction to insert the threaded rod 43 into the hole groove 1 46 for clamping. When the threaded rod 43 abuts the bottom of the hole groove 1 46, the threaded rod 43 and the internal threaded groove body 42 are not separated, and the length of the slide groove 1 45 just meets the moving length of the slider 44. The internal threaded groove body 42 is locked by the locking component 5 to prevent it from continuing to rotate, thereby completing the fixation of the two connecting pipes 2 to the two ends of the sleeve 1 respectively.

[0051] Specifically, the bottom of the card slot 1 48 is an open structure, which facilitates the insertion of the card block 1 47 into the card slot 1 48 from the bottom. Example

[0052] See Figure 1-5The locking assembly 5 includes: a circular groove 51, which is opened on the outer wall of the sleeve 1 and connected to the through hole 41; a circular block 52, which is arranged on the outer wall of the internal threaded groove body 42 away from the end of the threaded rod 43; a second slide groove 53, which is symmetrically opened on the outer wall of the circular block 52; an elastic member 54, which is arranged in the second slide groove 53 and connected to the second clamping block 55; the second clamping grooves 56, which are symmetrically and evenly opened on the inner wall of the circular groove 51 and match the second clamping block 55; a block 57, which is arranged on the outer wall of the second clamping block 55 away from the internal threaded groove body 42; and a notch 58, which is opened on the outer wall of the circular block 52 and allows the block 57 to slide radially. The two blocks 57 are pressed at the same time, so that the two blocks 57 slide in the notch 58 and drive the second block 55 to slide into the second slide groove 53. The second block 55 squeezes the elastic member 54, and the elastic member 54 contracts. Pressing and rotating the block 57 can drive the internal thread groove body 42 to rotate. When the threaded rod 43 just abuts the bottom of the hole groove 1 46, the block 57 is released, and the force of the elastic member 54 to restore the deformation drives the second block 55 to engage with the corresponding second slot 56, thereby completing the locking of the internal thread groove body 42 to prevent it from rotating. Example

[0053] See Figure 1-3 The outer wall of the connecting tube 2 and the inner wall of the sleeve 1 are symmetrically provided with a second hole groove 6, and a magnetic block 7 that attracts each other is provided in the second hole groove 6, so that the user can easily connect the card block 1 47 with the card groove 1 48, thereby preliminarily fixing the connecting tube 2 and the sleeve 1, so that the subsequent fastening can take effect. Example

[0054] See Figure 1-5 One end of the second clamping block 55 and the second clamping slot 56 is a cone, which facilitates the clamping of the second clamping block 55 and the second clamping slot 56. Example

[0055] See Figure 1-5 The outer wall of the block 57 is provided with an anti-skid pad 8 to increase the friction between the user's hand and the outer wall of the block 57. The outer wall of the anti-skid pad 8 is provided with anti-skid grooves to further increase the friction between the user's hand and the outer wall of the anti-skid pad 8.

[0056] The above description is only a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation methods without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. Technical features not described in the present invention can be achieved by or using existing technologies, and will not be described here.

Claims

1. A casing floating collar device for oil well cementing, comprising a casing (1), connecting pipes (2) symmetrically arranged at both ends of the casing (1), and a movable mechanism (3) arranged on the inner side wall of the casing (1), characterized in that: The outer side wall of the sleeve (1) is provided with a fixing assembly (4), and the fixing assembly (4) comprises: Through holes (41) are symmetrically arranged in pairs on the outer side walls at both ends of the sleeve (1); An internal threaded groove body (42) is connected to the through hole (41) via a bearing and is threadedly connected to a threaded rod (43); A slider (44) symmetrically connected to the outer side wall of the threaded rod (43); A first slide groove (45) is symmetrically arranged in the through hole (41) and is slidably connected to the slider (44); A hole groove (46) is provided on the surface of the connecting pipe (2) and is engaged with the inner end of the threaded rod (43); The first clamping blocks (47) are symmetrically arranged on the inner side walls of both ends of the sleeve (1); A first clamping groove (48) is symmetrically provided on the end surface of the connecting pipe (2) and is clamped with the first clamping block (47); A locking assembly is provided at one end of the internal thread groove (42) away from the threaded rod (43).

2. The casing floating collar device for oil well cementing according to claim 1, characterized in that: The locking assembly comprises: A circular groove (51) is formed on the outer wall of the sleeve (1) and is connected to the through hole (41); A circular block (52) is provided on the outer side wall of one end of the internal thread groove (42) away from the threaded rod (43); A second chute (53) is symmetrically arranged on the outer side wall of the circular block (52); An elastic member (54) is disposed in the second slide groove (53) and is connected to the second clamping block (55); The second card slots (56) are symmetrically and evenly arranged on the inner side wall of the circular slot (51) and matched with the second card block (55); A block (57) is arranged on the outer side wall of the second clamping block (55) away from the internal thread groove (42); A notch (58) is provided on the outer side wall of the circular block (52) and is slidably connected to the block (57).

3. The casing floating collar device for oil well cementing according to claim 1, characterized in that: The outer wall of the connecting tube (2) and the inner wall of the sleeve (1) are both symmetrically provided with a second hole groove (6), and a magnetic block (7) that attracts each other is provided in the second hole groove (6).

4. The casing floating collar device for oil well cementing according to claim 2, characterized in that: One end of the second clamping block (55) that is clamped with the second clamping slot (56) is a cone.

5. The casing floating collar device for oil well cementing according to claim 2, characterized in that: The outer side wall of the block (57) is provided with an anti-slip pad (8).

6. The casing floating collar device for oil well cementing according to claim 5, characterized in that: The outer side wall of the anti-slip pad (8) is provided with anti-slip grooves.

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