A geological drilling under casing assist device

Abstract

The utility model relates to a geological drilling casing auxiliary device belongs to geological drilling technical field, this geological drilling casing auxiliary device, include: centralizer and fixed establishment, the outside of centralizer is opened with installation cavity, the inside embedding installation of installation cavity has the ball, the fixed establishment includes the fixed frame of fixed connection in the inside of installation cavity, the ball embedding installation is in the inside of fixed frame, the ball penetrates out fixed frame, the inside of fixed frame is opened with bearing cavity, the inside of bearing cavity is inserted with sealing washer, the sealing washer is set up in the surface of ball, through the close contact of sealing washer and ball forms dynamic sealing barrier, cooperation ring cavity in oil absorbing cotton storage's lanolin continues to ooze and forms oil film on the surface of ball, effectively prevents the impurity such as slurry and enters the contact gap of ball and installation cavity, significantly reduces friction resistance, ensures the use effect of centralizer.

Description

Technical Field

[0001] This utility model relates to the field of geological drilling technology, and in particular to an auxiliary device for casing installation in geological drilling. Background Technology

[0002] In geological drilling, the casing installation process involves connecting steel pipe sections one by one and lowering them into the borehole to reinforce the borehole wall and seal the formation. In this process, the centralizer serves as a key auxiliary device, using a rigid structure and ball bearings to keep the casing centered, thus preventing it from sticking to the borehole wall and affecting cementing quality.

[0003] Currently, most centralizers use an embedded installation method to fix the balls to the surface. While this design effectively reduces frictional resistance during casing installation, it has a significant drawback: impurities such as drilling mud and soil can easily enter the interior through the gap between the balls and the mounting cavity. The accumulation of these impurities significantly increases the frictional resistance of the rolling balls, affecting the performance of the centralizer. Utility Model Content

[0004] Therefore, it is necessary to provide a casing installation auxiliary device for geological drilling to address the problem that the existing ball embedding installation method of casing stabilizers easily allows drilling impurities to enter the gap between the ball and the installation cavity, resulting in increased friction and affecting the performance.

[0005] A casing-running auxiliary device for geological drilling includes: a centralizer and a fixing mechanism. The centralizer has an installation cavity on its outer side, and a ball bearing is embedded in the installation cavity.

[0006] In one embodiment, the fixing mechanism includes a fixing frame fixedly connected to the inside of the mounting cavity, the ball being embedded in the inner side of the fixing frame and extending through the fixing frame, a bearing cavity being formed on the inner side of the fixing frame, a sealing ring being inserted into the bearing cavity, the sealing ring being sleeved on the surface of the ball, and the cross-sectional shape of the contact area between the bearing cavity and the sealing ring being convex.

[0007] In one embodiment, the cross-sectional shape of the mounting cavity, the fixing frame, and the contact area between the sealing ring and the ball is all arc-shaped.

[0008] In one embodiment, a positioning opening is provided on the outer side of the sealing ring, and a positioning strip that is fixedly connected to the bearing cavity is engaged on the inner side of the positioning opening.

[0009] In one embodiment, the vertical cross-sectional shapes of the positioning port and the positioning strip are both matching semicircles.

[0010] In one embodiment, the inner opening of the sealing ring is beveled, and the minimum dimension of the bevel of the sealing ring contacts the ball.

[0011] In one embodiment, the inner side of the sealing ring has an annular cavity, and the inner side of the annular cavity is filled with grease.

[0012] In one embodiment, an oil-absorbing cotton is embedded inside the annular cavity, and the grease is absorbed inside the oil-absorbing cotton.

[0013] In one embodiment, the outside of the straightener is provided with a first receiving cavity communicating with the mounting cavity, and the outside of the fixing frame is provided with a second receiving cavity communicating with the first receiving cavity. The interiors of the first receiving cavity and the second receiving cavity are filled with solder. Beneficial effects

[0014] 1. The above-mentioned auxiliary device for casing in geological drilling forms a dynamic sealing barrier through the tight contact between the sealing ring and the ball bearings. In conjunction with the continuous seepage of grease stored in the oil-absorbing cotton in the ring cavity and the formation of an oil film on the surface of the ball bearings, it effectively prevents impurities such as mud from entering the contact gap between the ball bearings and the mounting cavity, significantly reducing frictional resistance and ensuring the effectiveness of the stabilizer.

[0015] 2. The semi-circular fit between the positioning strip and the positioning port prevents the sealing ring from rotating and shifting. At the same time, the convex fit between the bearing cavity and the sealing ring and the filling of the solder form a static sealing barrier. This double protection further enhances the sealing effect and ensures the stable operation of the ball bearings in complex geological environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of a partial structure in this utility model;

[0020] Figure 4 This is a cross-sectional schematic diagram of a partial structure in this utility model;

[0021] Figure 5 This is an exploded view of a partial structure of this utility model.

[0022] Figure label:

[0023] 100. Centralizer; 110. Mounting cavity; 120. First receiving cavity; 200. Ball bearing; 300. Fixing mechanism; 310. Fixing frame; 311. Bearing cavity; 312. Second receiving cavity; 320. Sealing ring; 321. Positioning port; 322. Annular cavity; 330. Positioning strip; 340. Oil-absorbing cotton; 400. Solder. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] The following is combined with Figure 1 - Figure 5 This invention describes an auxiliary device for casing installation in geological drilling.

[0026] In one embodiment, a geological drilling casing auxiliary device includes: a stabilizer 100 and a fixing mechanism 300. The stabilizer 100 has an installation cavity 110 on its outer side, and a ball bearing 200 is embedded in the installation cavity 110.

[0027] The centralizer 100 includes the following structure:

[0028] Main body: made of high-strength steel, with an inner diameter matching the outer diameter of the casing, and an outer diameter slightly larger than the casing to provide a straightening effect.

[0029] Vertical straightening ridges: Multiple vertical straightening ridges are evenly distributed on the outer wall of the body. The vertical angle is at a certain angle to the axis to optimize the straightening force and chip removal capacity.

[0030] Chip removal groove: Chip removal grooves are added between the straightening edges to prevent rock chips from accumulating and causing blockage.

[0031] Reinforced materials: Special materials or surface treatments are used to enhance durability in high-temperature or corrosive environments.

[0032] Installation procedure for mounting the centralizer 100 onto the sleeve:

[0033] Slide into the sleeve: Slide the centralizer 100 into the designed position from the male thread end of the sleeve, usually near the coupling.

[0034] Fixing method:

[0035] Rigid clamp fixation: The centralizer 100 is fixed to the sleeve coupling by clamps to prevent axial movement.

[0036] Welding fixation: Under special working conditions, the two ends of the centralizer 100 can be directly welded to the sleeve body.

[0037] Well installation process:

[0038] Centering adjustment: When running the casing, the ball bearing 200 rolls and contacts the well wall, and the vertical ridge structure automatically adjusts the position of the centralizer 100 so that the casing axis coincides with the wellbore.

[0039] Resistance monitoring: Real-time monitoring of the lowering resistance; if abnormal, the drill bit should be lifted to check whether the ball bearing 200 is stuck or has fallen off.

[0040] Key points to note:

[0041] Spacing design: Horizontal well sections require dense installation of centralizers 100mm, while vertical well sections can be appropriately spaced.

[0042] Ball bearing 200 maintenance: Before going down into the well, the ball bearing 200 needs to be manually rotated to ensure there is no jamming; for special environments, use high temperature resistant or corrosion resistant ball bearing 200.

[0043] like Figure 3 , Figure 4 and Figure 5 As shown, the fixing mechanism 300 includes a fixing frame 310 fixedly connected inside the mounting cavity 110. A ball bearing 200 is embedded in the inner side of the fixing frame 310 and extends through the fixing frame 310. A bearing cavity 311 is formed inside the fixing frame 310. A sealing ring 320 is inserted into the bearing cavity 311 and is fitted onto the surface of the ball bearing 200. The cross-sectional shape of the contact area between the bearing cavity 311 and the sealing ring 320 is convex. The mounting cavity 110... 10. The cross-sectional shape of the contact parts between the fixed frame 310 and the sealing ring 320 and the ball 200 is arc-shaped; the outer side of the sealing ring 320 is provided with a positioning port 321, and the inner side of the positioning port 321 is fitted with a positioning strip 330 that is fixedly connected to the bearing cavity 311; the vertical cross-sectional shape of the positioning port 321 and the positioning strip 330 are both matching semi-circular shapes; the inner opening of the sealing ring 320 is beveled, and the minimum size of the bevel of the sealing ring 320 contacts the ball 200.

[0044] like Figure 3 , Figure 4 and Figure 5As shown, the inner side of the sealing ring 320 has an annular cavity 322, and the inner side of the annular cavity 322 is filled with grease. The grease can be a synthetic oil-based grease, specifically model Klüberfood-NH1-72-102, which is approximately liquid: NLGI-0 grade (semi-fluid), with a viscosity similar to honey, and can be easily absorbed by the oil-absorbing cotton 340; it is environmentally friendly: fully synthetic ester oil, certified by EU-Ecolabel, and harmless to water; it is safe: NSF-H1 certified (food grade), odorless, and without added pigments; the oil-absorbing cotton 340 is embedded inside the annular cavity 322, and the grease is absorbed inside the oil-absorbing cotton 340; the outer side of the stabilizer 100 has a first receiving cavity 120 that communicates with the mounting cavity 110, and the outer side of the fixing frame 310 has a second receiving cavity 312 that communicates with the first receiving cavity 120. The inner sides of the first receiving cavity 120 and the second receiving cavity 312 are filled with solder 400.

[0045] In this embodiment, the installation process of the ball bearing 200 is as follows: First, the ball bearing 200 is embedded inside the mounting cavity 110. Then, an unused fixing mechanism 300 is taken out, and grease is evenly applied to the oil-absorbing cotton 340. Then, the fixing mechanism 300 is inserted into the mounting cavity 110, and the ball bearing 200 passes through the fixing frame 310. Next, the solder 400 is filled into the space between the first receiving cavity 120 and the second receiving cavity 312 by welding, so as to achieve a permanent connection between the fixing frame 310 and the mounting cavity 110, and finally the fixed installation of the ball bearing 200 is completed.

[0046] Working principle: When the centralizer 100 moves in the wellbore, the sealing ring 320 forms the first dynamic sealing barrier through the close contact between its inner chamfer and the ball 200. The grease stored in the oil-absorbing cotton 340 in its annular cavity 322 continuously seeps out, forming an oil film on the surface of the ball 200 to enhance sealing and reduce friction. At the same time, the semi-circular fit structure between the positioning strip 330 and the positioning port 321 prevents the sealing ring 320 from rotating and shifting. The convex fit between the bearing cavity 311 and the sealing ring 320 and the filling of the solder 400 together constitute the second static sealing barrier. The double protection effectively prevents mud from entering the contact gap between the ball 200 and the mounting cavity 110.

[0047] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A casing-running auxiliary device for geological drilling, characterized in that, include: A centralizer (100) has an installation cavity (110) on its outer side, and a ball bearing (200) is embedded inside the installation cavity (110). The fixing mechanism (300) includes a fixing frame (310) fixedly connected to the inside of the mounting cavity (110), the ball (200) is embedded in the inner side of the fixing frame (310), the ball (200) passes through the fixing frame (310), the inner side of the fixing frame (310) is provided with a bearing cavity (311), a sealing ring (320) is inserted into the inside of the bearing cavity (311), the sealing ring (320) is sleeved on the surface of the ball (200), and the cross-sectional shape of the contact part of the bearing cavity (311) and the sealing ring (320) is convex.

2. The geological drilling casing auxiliary device according to claim 1, characterized in that, The cross-sectional shape of the contact area between the mounting cavity (110), the fixing frame (310), and the sealing ring (320) and the ball (200) is arc-shaped.

3. The geological drilling casing auxiliary device according to claim 1, characterized in that, The sealing ring (320) has a positioning port (321) on its outer side, and a positioning strip (330) that is fixedly connected to the bearing cavity (311) is engaged on the inner side of the positioning port (321).

4. The geological drilling casing auxiliary device according to claim 3, characterized in that, The vertical cross-sectional shapes of the positioning port (321) and the positioning strip (330) are both matching semi-circles.

5. The auxiliary device for casing installation in geological drilling according to claim 1, characterized in that, The inner opening of the sealing ring (320) is beveled, and the minimum size of the bevel of the sealing ring (320) contacts the ball (200).

6. The geological drilling casing auxiliary device according to claim 1, characterized in that, The sealing ring (320) has an annular cavity (322) on its inner side, and the inner side of the annular cavity (322) is filled with grease.

7. The geological drilling casing auxiliary device according to claim 6, characterized in that, An oil-absorbing cotton (340) is embedded inside the annular cavity (322), and the grease is adsorbed inside the oil-absorbing cotton (340).

8. The geological drilling casing auxiliary device according to claim 1, characterized in that, The outside of the straightener (100) is provided with a first receiving cavity (120) that communicates with the mounting cavity (110), and the outside of the fixing frame (310) is provided with a second receiving cavity (312) that communicates with the first receiving cavity (120). The first receiving cavity (120) and the second receiving cavity (312) are filled with solder (400).

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