CN115030667A - Centralizer of cable logging instrument and centralizing method of cable logging instrument - Google Patents
Centralizer of cable logging instrument and centralizing method of cable logging instrument Download PDFInfo
- Publication number
- CN115030667A CN115030667A CN202210631602.1A CN202210631602A CN115030667A CN 115030667 A CN115030667 A CN 115030667A CN 202210631602 A CN202210631602 A CN 202210631602A CN 115030667 A CN115030667 A CN 115030667A
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- Prior art keywords
- logging instrument
- cable logging
- centralizer
- cylinder
- roller
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003129 oil well Substances 0.000 claims abstract description 30
- 210000001503 joint Anatomy 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 230000001788 irregular Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a centralizer of a cable logging instrument and a centralizing method of the cable logging instrument, wherein the centralizer of the cable logging instrument comprises a cylinder body and at least two rollers, wherein the cylinder body is sleeved and positioned on the periphery of the cable logging instrument; the two opposite outer side surfaces of the cylinder body are respectively provided with an installation position, and the rollers are respectively matched and connected on the installation positions. The roller is rotatable relative to the cylinder and can roll along the inner surface of the oil well wall to drive the cylinder and the cable logging instrument to move along the oil well wall. The invention can change the sliding friction between the cable logging instrument and the oil well wall into rolling friction, reduce the friction resistance of the cable logging instrument in the well, meet the requirement of the cable logging instrument for entering the well under the working conditions of a highly deviated well and an irregular well, and improve the success rate of the cable logging.
Description
Technical Field
The invention relates to the technical field of petroleum logging instruments, in particular to a centralizer of a cable logging instrument and a centralizing method of the cable logging instrument.
Background
In the implementation process of petroleum exploration and development and cable logging engineering operation, engineering accidents such as resistance, jamming and back-off of a cable logging instrument caused by well deviation, borehole irregularity, large wellbore pressure difference and the like are frequently encountered.
In a highly deviated well, when the friction resistance is greater than the self gravity component of the cable logging instrument, the cable logging instrument cannot be put down when meeting the resistance. Generally speaking, in an open hole section, the friction coefficient is 0.35, the casing is 0.2, and the cable friction influence is added, the well deviation of the open hole section is more than 50 degrees, the well deviation of the casing section is more than 60 degrees, and a cable logging instrument string cannot be normally lowered; if the cable logging instrument is directly attached to the well wall, the cable logging instrument is subjected to pressure generated by the pressure difference of the well shaft, which is a common factor causing the sticking and blocking of the cable logging instrument; if a step-shaped well wall is generated in the drilling process, the cable logging instrument is directly placed down along the well wall, and the cable logging instrument string cannot pass through the step-shaped well wall.
Therefore, it is necessary to design a device which can reduce the friction resistance of the cable logging instrument when the cable logging instrument moves in the well and adapt to well conditions of large inclination, irregularity, large shaft pressure difference and the like so as to improve the success rate of cable logging and reduce the operation risk.
Disclosure of Invention
The invention aims to provide a centralizer and a centralizing method of a cable logging instrument.
The technical scheme adopted by the invention for solving the technical problems is as follows: the centralizer comprises a cylinder body, at least two rollers and a control device, wherein the cylinder body is used for being sleeved on and positioned on the periphery of the cable logging instrument, and the at least two rollers are used for being in contact with the wall of an oil well; the two opposite outer side surfaces of the cylinder body are respectively provided with a mounting position, and the rollers are respectively matched and connected with the mounting positions;
the roller is rotatable relative to the cylinder and can roll along the inner surface of the oil well wall to drive the cylinder and the cable logging instrument to move along the oil well wall.
Preferably, the cylinder comprises at least two arc-shaped cylinder walls; at least two arc-shaped cylinder walls are matched and butted to form the cylinder body.
Preferably, the barrel further comprises a plurality of connectors;
the butt joint end of each arc-shaped cylinder wall is provided with a connecting hole, and the connecting holes on the butt joint ends of two adjacent arc-shaped cylinder walls are relatively communicated; the connecting pieces are respectively fastened in the connecting holes which are communicated oppositely to connect two adjacent arc-shaped cylinder walls.
Preferably, the inner surface of the cylinder body is circumferentially provided with a clamping part matched with the cable logging instrument;
the clamping part is a polygonal flange protruding towards the center of the cylinder body on the inner surface of the cylinder body.
Preferably, the surface of the roller, which faces away from the barrel, is provided with an arc surface corresponding to the inner surface of the oil well wall.
Preferably, a plurality of grooves distributed at intervals are arranged on the arc surface.
Preferably, the wireline tool centralizer further comprises a connection assembly disposed between the barrel and the roller;
the rollers are rotatably arranged on the two opposite sides of the barrel body through the connecting assemblies respectively.
Preferably, the connecting assembly comprises a connecting shaft and a fastener which are oppositely and cooperatively arranged between the cylinder and the roller;
the connecting shaft is arranged between the cylinder and the roller in a penetrating way; the fastening piece is arranged on the roller and matched with the connecting shaft to axially fix the roller on the connecting shaft;
the roller can rotate relative to the cylinder body through the connecting shaft in a fixed shaft mode.
Preferably, the cylinder body and the roller are both provided with shaft holes, and the connecting shaft is arranged in the shaft holes in a penetrating manner.
The invention also provides a cable logging instrument righting method, which comprises the following steps:
s1, installing the cable logging instrument centralizer on the periphery of a cable logging instrument;
s2, lowering the cable logging instrument with the cable logging instrument centralizer into an oil well through a cable;
and S3, in the oil well, the roller of the cable logging instrument centralizer is in contact with the wall of the oil well and rolls relative to the inner surface of the wall of the oil well, centralizes and drives the cable logging instrument until the cable logging instrument is lowered to the position.
The invention has the beneficial effects that: the invention can change the sliding friction between the cable logging instrument and the oil well wall into rolling friction, reduce the friction resistance of the cable logging instrument in the well, meet the well entering requirement of the cable logging instrument under the working conditions of a highly-deviated well and an irregular well, improve the success rate of the cable logging and reduce the operation risk.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a wireline tool centralizer, according to an embodiment of the invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
FIG. 1 illustrates a wireline tool centralizer, which may include a barrel 1 for nesting and positioning on the outer circumference of a wireline tool (not shown), rollers 2 contactable with the well wall (not shown), at least two rollers 2 for contacting the well wall, in some embodiments of the invention; the two opposite outer side surfaces of the cylinder body are respectively provided with a mounting position 4, and the rollers 2 are respectively matched and connected on the mounting positions 4. Specifically, the central axis of the roller 2 and the central axis of the cylinder 1 are perpendicular to each other. The roller 2 is rotatable relative to the cylinder 1 and can roll along the inner surface of the oil well wall to drive the cylinder 1 and the cable logging instrument to move along the oil well wall.
Further, in order to ensure that the cable logging tool centralizer has enough bearing capacity, as shown in fig. 1, two rollers 2 may be respectively arranged on two opposite sides of the cylinder 1. Correspondingly, when two rollers 2 are respectively arranged on two opposite sides of the cylinder 1, in order to avoid collision caused by too close distance between two adjacent rollers 2 on the same side, two adjacent rollers on the same side are arranged at a certain distance. In order to avoid the situation that impurities enter a gap between two adjacent rollers 2 in an oil well and influence the movement of the rollers 2, a resisting part 40 can be arranged between two adjacent mounting positions 4 on the same side, and the resisting part 40 can be a flange extending from the mounting positions 4 to the outer side of the barrel 1.
To facilitate the mounting or dismounting of the cartridge 1, the cartridge 1 may in some embodiments comprise at least two curved cartridge walls 11; at least two arc-shaped cylinder walls 11 are matched and butted to form the cylinder body 1. In particular, the cartridge 1 also comprises several connections (not shown). The butt joint end of each arc-shaped cylinder wall 11 is provided with a connecting hole 10, and the connecting holes 10 on the butt joint ends of two adjacent arc-shaped cylinder walls 11 are oppositely communicated; the connecting pieces are respectively fastened in the connecting holes 10 which are oppositely communicated, and the two adjacent arc-shaped cylinder walls 11 are connected.
The connecting hole 10 can penetrate through the arc-shaped cylinder wall 11 from the outer surface of the arc-shaped cylinder wall 11 along the direction parallel to the horizontal radial direction of the arc-shaped cylinder wall 11; alternatively, the connection hole 10 may extend from the outer surface of the cylinder 1 along the inside of the cylinder 1 and penetrate the end surface of the butt end. The connecting piece can be a bolt connecting piece, a buckle connecting piece, a concave-convex plug-in type matching connecting piece and the like.
In the embodiment shown in fig. 1, the cylinder 1 is formed by symmetrically arranging and butting two identical arc-shaped cylinder walls 11. It is understood that in other embodiments, the cylinder body 1 can also be formed by butting two arc-shaped cylinder walls 11 with different arc lengths; alternatively, the cylinder 1 is formed by three or more arc-shaped cylinder walls 11 in a surrounding manner.
In some embodiments, the inner surface of the barrel 11 is circumferentially provided with a gripping portion (not shown) for engaging with a wireline logging tool. The clamping part is a polygonal flange protruding towards the center of the cylinder 11 on the inner surface of the cylinder 11. The polygonal flange is arranged to match the polygonal peripheral part of the cable logging instrument, when the barrel 1 is installed on the cable logging instrument, the polygonal flange part and the polygonal peripheral part of the cable logging instrument are mutually abutted to form a tight attaching state, and the firmness degree of installation of the centralizer of the cable logging instrument is improved.
In some embodiments, the wireline tool centralizer further comprises a connection assembly disposed between the barrel 1 and the roller 2; the rollers 2 are rotatably provided on opposite sides of the drum 1 through the coupling assembly. The connecting assembly may include a connecting shaft 30 and a fastener 31, a bearing 32 and a bearing snap ring 33 which are relatively and cooperatively arranged between the cylinder 1 and the roller 2.
Wherein, the connecting shaft 30 can be arranged between the cylinder body 1 and the roller 2 in a penetrating way, and the fastener 31 can be arranged on the roller 2 and is matched with the connecting shaft 30 to axially fix the roller 2 on the connecting shaft 30. The barrel 1 and the roller 2 are respectively provided with a shaft hole 12 and a shaft hole 22, and the connecting shaft 30 is arranged in the shaft hole 12 and the shaft hole 22 in a penetrating way. Specifically, a bearing 32 for supporting the roller 2 to rotate may be further provided between the shaft and the roller 2 to maintain the rotational accuracy of the connecting shaft 30. In order to prevent the inner and outer rings of the bearing 32 from being separated, a deep groove ball bearing can be selected. To further axially fix the bearing 32, bearing snap rings 33 may be provided on both sides of the bearing 32 on the connecting shaft 30 to maintain the stability and firmness of the bearing 32 on the shaft.
As shown in fig. 1, the surface of the roller 2 facing away from the cylinder in one embodiment includes a curved surface 20. Understandably, the oil well wall of contact is the arc surface in the cable logging instrument working process, gyro wheel 2 and oil well wall arc surface direct contact roll on direct contact's face, and gyro wheel 2 surface 1 of barrel dorsad can be designed for the surface shape that has cambered surface 20 to guarantee that the rolling surface of gyro wheel 2 corresponds the arc surface of laminating the oil well wall to a certain extent, promote the stability of gyro wheel 2 when rolling on the oil well wall.
The cambered surface 20 is provided with a plurality of grooves 21 distributed at intervals in one embodiment, and the design of the grooves 21 can reduce the contact area between the roller 2 and the wall of the oil well, thereby reducing rolling friction, i.e., reducing the blocking torque of the roller 2.
Referring to fig. 1, the centralizer for a wireline logging instrument of the present invention is applied to centralizing a wireline logging instrument, and a corresponding centralizer for a wireline logging instrument centralizing method may include the following steps:
s1, installing the cable logging instrument centralizer on the periphery of the cable logging instrument;
s2, lowering the cable logging instrument with the cable logging instrument centralizer into the well through a cable;
and S3, in the well, the roller 2 of the centralizer of the cable logging instrument is in contact with the wall of the well and rolls relative to the wall of the well, and the centralizer centralizes and drives the cable logging instrument to be put down in place.
Specifically, in step S1, the connecting members of the two adjacent arc-shaped cylinder walls 11 of the cable logging tool centralizer can be separated, the polygonal position of the cable logging tool is placed on the clamping portion (polygonal flange) on the inner surface of the cylinder 1, and then the adjacent arc-shaped cylinder walls 11 are connected and fastened by the connecting members, so as to complete the installation of the cable logging tool centralizer. Similarly, the cable logging instrument centralizer can be disassembled according to the steps. When the cable logging instrument centralizer is disassembled, one or more cable logging instruments in the cable logging instrument string can be disassembled independently, and the working state of other cable logging instrument centralizers is not influenced.
In the steps S2-S3, the cable logging instrument centralizer rolls along the wall of the oil well in the oil well, the cable logging instrument is driven to move in the oil well, and the cable logging instrument can be kept in a position close to the center of the oil well all the time. When a stepped or other irregular well wall is encountered, the roller 2 of the cable logging instrument centralizer can also cross the stepped or other irregular well wall in a rolling manner until the cable logging instrument is lowered to a specified position.
The above description is only for the purpose of illustrating certain embodiments of the present invention and is not intended to limit the scope of the present invention, which is within the scope of the present invention, and all equivalent structures or equivalent processes that can be directly or indirectly implemented in other related arts and technologies using the contents of the present specification and the accompanying drawings are also included in the present invention.
Claims (10)
1. A centralizer of a cable logging instrument is characterized by comprising a cylinder body, at least two rollers and a locking mechanism, wherein the cylinder body is sleeved on and positioned on the periphery of the cable logging instrument; the two opposite outer side surfaces of the cylinder body are respectively provided with a mounting position, and the rollers are respectively matched and connected with the mounting positions;
the roller is rotatable relative to the cylinder and can roll along the inner surface of the oil well wall to drive the cylinder and the cable logging instrument to move along the oil well wall.
2. The wireline tool centralizer of claim 1, wherein the cylinder comprises at least two arcuate cylinder walls; at least two arc-shaped cylinder walls are matched and butted to form the cylinder body.
3. The wireline tool centralizer of claim 2, wherein the barrel further comprises a plurality of connectors;
the butt joint end of each arc-shaped cylinder wall is provided with a connecting hole, and the connecting holes on the butt joint ends of two adjacent arc-shaped cylinder walls are oppositely communicated; the connecting pieces are respectively fastened in the connecting holes which are communicated oppositely, and the two adjacent arc-shaped cylinder walls are connected.
4. The wireline logging tool centralizer of claim 1, wherein the inner surface of the cylinder body is circumferentially provided with a clamping part matched with the wireline logging tool;
the clamping part is a polygonal flange protruding towards the center of the cylinder body on the inner surface of the cylinder body.
5. The wireline tool centralizer of claim 1, wherein a surface of the roller facing away from the barrel is provided with a curved surface corresponding to an inner surface of the well wall.
6. The wireline tool centralizer of claim 5, wherein the arcuate surface is provided with a plurality of spaced grooves.
7. The wireline tool centralizer of any of claims 1-6, further comprising a connection assembly disposed between the barrel and the roller;
the rollers are rotatably arranged on the two opposite sides of the barrel body through the connecting assemblies respectively.
8. The wireline tool centralizer of claim 7, wherein the coupling assembly comprises a coupling shaft and a fastener cooperatively disposed relative between the barrel and the roller;
the connecting shaft is arranged between the cylinder and the roller in a penetrating way; the fastening piece is arranged on the roller and matched with the connecting shaft to axially fix the roller on the connecting shaft;
the roller can rotate relative to the cylinder body through the connecting shaft in a fixed shaft mode.
9. The centralizer of claim 8, wherein the cylinder and the roller are provided with shaft holes, and the connecting shaft is arranged in the shaft holes in a penetrating manner.
10. A cable logging instrument centralizing method is characterized by comprising the following steps:
s1, mounting the wireline tool centralizer of any of claims 1-9 on the outer circumference of a wireline tool;
s2, lowering the cable logging instrument with the cable logging instrument centralizer into an oil well through a cable;
and S3, in the oil well, the roller of the cable logging instrument centralizer is in contact with the wall of the oil well and rolls relative to the inner surface of the wall of the oil well, centralizes and drives the cable logging instrument until the cable logging instrument is lowered to the position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210631602.1A CN115030667A (en) | 2022-06-06 | 2022-06-06 | Centralizer of cable logging instrument and centralizing method of cable logging instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210631602.1A CN115030667A (en) | 2022-06-06 | 2022-06-06 | Centralizer of cable logging instrument and centralizing method of cable logging instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115030667A true CN115030667A (en) | 2022-09-09 |
Family
ID=83123988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210631602.1A Pending CN115030667A (en) | 2022-06-06 | 2022-06-06 | Centralizer of cable logging instrument and centralizing method of cable logging instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115030667A (en) |
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2022
- 2022-06-06 CN CN202210631602.1A patent/CN115030667A/en active Pending
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