Resonator suitable for soft and hard staggered and high-abrasiveness stratum
By distributing active slashing teeth, resistance-reducing diameter-saving teeth and active slashing teeth on the wings of the slasher, and using cooling grooves and chip drainage grooves to improve the cooling and cleaning effect of cutting teeth, the problem of easy damage to the cutting teeth in soft and hard interlaced and highly abrasive formations is solved, and efficient cutting and long life effect is achieved.
Patent Information
- Application Number
- CN202411770589.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-03-11
AI Technical Summary
In soft and hard interlaced and highly abrasive formations, the cutting teeth of existing slashers are susceptible to impact damage and thermal wear, resulting in a decrease in the quality of the wellbore and increasing the risk and ageing of the drilling process.
A slasher including a lower joint, a columnar body, a knife wing and an upper joint is designed. Active slashing teeth, drag-reducing diameter-retaining teeth and active diameter-retaining teeth are evenly distributed on the knife wing, and the cooling and cleaning effect of the cutting teeth is improved through cooling grooves and chip drainage grooves.
The slasher maintains efficient cutting capabilities in soft and hard interlaced and highly abrasive formations, reduces the wear of cutting teeth, improves slashing efficiency, ensures borehole size, extends tool life, and reduces the risk of drilling process.
Smart Images
Figure CN119593696A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil and gas drilling tools, and more particularly to a reamer suitable for soft-hard interlaced and highly abrasive formations. Background Art
[0002] During the drilling process of oil and gas development, the wellbore is exposed in the drilling fluid, which may cause wellbore shrinkage, collapse, block falling and other wellbore complications due to various factors such as formation pressure, destruction of ground stress balance, the effect of drilling fluid and formation lithology, which will have an adverse effect on subsequent drilling and casing operation.
[0003] As a new type of downhole tool in drilling operations, the reamer can trim the wellbore wall while drilling, ensure the wellbore size, correct irregular or reduced wellbore, reduce the risk of drilling operations, and enable the drilling work to be completed smoothly. However, in soft and hard interlaced and highly abrasive formations, the reamer must not only withstand the high impact of the hard interlayer but also the high abrasiveness of the hard formation. The cutting teeth on conventional reamers are severely damaged by impact, and the diameter-protecting part wears quickly, which not only affects the wellbore quality and increases the risk of tripping and casing operations, but also affects the drilling time. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a reamer suitable for soft and hard interlaced and highly abrasive formations, which can effectively maintain high-efficiency cutting capabilities in soft and hard interlaced and highly abrasive formations, reduce impact damage and thermal wear of cutting teeth, improve reaming efficiency and ensure wellbore size, and has the characteristics of long life, reduces the resistance of the drill string to drilling, provides a safe working environment, and improves drilling efficiency.
[0005] The technical solution adopted by the present invention to solve its technical problems is: constructing a reamer suitable for soft and hard interlaced and highly abrasive formations, comprising a lower joint, a columnar body, blades and an upper joint arranged from bottom to top; the blades are evenly distributed on the columnar body along the axial direction of the columnar body, a cooling groove is arranged in the middle of the blades, the cooling groove separates the blades into a front main blade and a rear auxiliary blade, the adjacent blades form a chip groove with the annulus of the well wall, the front main blade is evenly provided with active reaming teeth and drag reducing and diameter protecting teeth, and the rear auxiliary blade is evenly provided with active reaming teeth, drag reducing and diameter protecting teeth and active diameter protecting teeth.
[0006] According to the above solution, the blade is in the shape of a straight blade or a spiral blade.
[0007] According to the above solution, there is a radial height difference between the outer diameter contour line of the front main blade wing and the outer diameter contour line of the rear auxiliary blade wing.
[0008] According to the above scheme, the active eye-marking teeth are fixedly arranged on the conical surfaces at both ends, and the active gauge-guarding teeth and the drag-reducing gauge-guarding teeth are fixedly arranged on the gauge-guarding surfaces.
[0009] According to the above scheme, the active gauge teeth are fixedly arranged on the rear auxiliary blade wing, the drag reducing gauge teeth are fixedly arranged on the front main blade wing and the rear auxiliary blade wing at the same time, double rows of active eye-cutting teeth are arranged on the conical surfaces at both ends of the front main blade wing and the rear auxiliary blade wing, and the active gauge teeth and the drag reducing gauge teeth on the gauge surface are arranged alternately.
[0010] According to the above scheme, the diameter of the radial outer envelope line of the drag-reducing and gauge-preserving tooth column is larger than the diameter of the outer diameter contour line of the front main blade wing and the outer diameter contour line of the rear auxiliary blade wing.
[0011] According to the above solution, the active eye-marking teeth are diamond composite sheets.
[0012] According to the above scheme, the active gauge teeth are all diamond composite pieces.
[0013] According to the above solution, the drag reducing and gauge maintaining teeth are cemented carbide columns or spherical diamond columns.
[0014] The reamer of the present invention, which is suitable for soft-hard interlaced and highly abrasive formations, has the following beneficial effects:
[0015] 1. The wide chip removal groove of the present invention makes the drilling fluid have good passability, which is conducive to the drilling fluid carrying the rock cuttings returned from the bottom of the well to wash the rock cuttings cut by the reaming operation of the front main blade of the reamer, and is conducive to cooling the cutting teeth of the front main blade of the reamer; the cooling groove and radial height difference between the front main blade and the rear auxiliary blade enable the drilling fluid to wash and carry the rock cuttings cut by the reaming operation of the rear auxiliary blade, which improves the cooling capacity of the active reaming teeth, active gauge teeth, and drag reduction gauge teeth of the rear auxiliary blade, can effectively remove chips and dissipate heat, and improve the overall service life of the reamer;
[0016] 2. The reamer of the present invention has the ability to trim the wellbore during drilling, can effectively maintain high-efficiency cutting ability in soft and hard interlaced and highly abrasive formations, reduce impact damage and thermal wear of cutting teeth, improve reaming efficiency and ensure wellbore size, reduce resistance of drill string tripping, provide a safe working environment, and improve drilling efficiency;
[0017] 3. The gauge parts of the front main blade and the rear auxiliary blade of each blade of the present invention can be alternately equipped with drag-reducing gauge teeth and active gauge teeth. The high tooth density can effectively ensure the impact resistance when passing through hard interlayers and the anti-grinding ability during active gauge maintenance, effectively ensuring the quality of the wellbore. The drag-reducing gauge teeth have a low friction coefficient. The end face of the alloy column protrudes from the gauge surface of the blade body and is installed on the blade, which can effectively reduce friction resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0019] Figure 1 It is a three-dimensional structural diagram of the eye-reamer of the present invention suitable for soft and hard interlaced and highly abrasive formations;
[0020] Figure 2 The present invention Figure 1 A partial enlarged view of the middle A;
[0021] Figure 3 It is a front view of the eye reamer of the present invention which is applicable to soft and hard interlaced and highly abrasive formations;
[0022] Figure 4 and Figure 5 The present invention Figure 3 BB section view in;
[0023] In the figure: 1. cylindrical body, 2. active eye-marking teeth, 3. drag-reducing and diameter-protecting teeth, 4. chip removal grooves, 5. active diameter-protecting teeth, 6. cooling grooves, 7. blade wings, 8. lower joint, 9. upper joint, 10. conical surfaces at both ends, 11. diameter-protecting surfaces, 12. front main blade wings, 13. rear auxiliary blade wings. DETAILED DESCRIPTION
[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.
[0025] like Figure 1-5 As shown, the eye-reaming device of the present invention, which is suitable for soft-hard interlaced and highly abrasive formations, comprises a columnar body 1, active eye-reaming teeth 2, drag-reducing and diameter-protecting teeth 3, drag-reducing and diameter-protecting teeth 3, active diameter-protecting teeth 5, a chip removal groove 4, a cooling groove 6, a blade wing 7, a lower joint 8 and an upper joint 9, wherein the lower joint 8, the columnar body 1, the blade wing 7 and the upper joint 9 are arranged from bottom to top. The blade wing 7 is evenly distributed on the columnar body 1 along the axial direction of the columnar body 1, and a cooling groove 6 is provided in the middle of the blade wing 7. The cooling groove 6 separates the blade wing 7 into a front main blade wing 12 and a rear auxiliary blade wing 13. The adjacent blade wings 7 and the well wall annulus form a chip removal groove 4, and the chip removal groove 4 and the cooling groove 6 serve as a drilling fluid channel. There are multiple active eye-reaming teeth 2, drag-reducing and diameter-protecting teeth 3, and active diameter-protecting teeth 5, which are fixedly arranged on the front main blade wing 12 and the rear auxiliary blade wing 13 of the blade wing 7.
[0026] The blade wing 7 is in the shape of a straight blade wing or a spiral blade wing, and a cooling groove 6 is provided in the middle of each blade wing, and the cooling groove 6 separates the blade wing 7 into a front main blade wing 12 and a rear auxiliary blade wing 13. Figure 5As shown, there is a radial height difference H between the outer diameter contour line Rf of the front main blade wing 12 and the outer diameter contour line Rb of the rear auxiliary blade wing 13; the cooling groove 6 and the radial height difference design between the front main blade wing 12 and the rear auxiliary blade wing 13 can improve the cooling capacity of the active eye-marking teeth 2, active diameter-guarding teeth 5 and drag-reducing diameter-guarding teeth 3 on the rear auxiliary blade wing 13, can effectively remove chips and dissipate heat, and improve service life.
[0027] Active eye-marking teeth 2 are fixedly arranged on the conical surfaces 10 at both ends, and active gauge teeth 5 and drag-reducing gauge teeth 3 are fixed on the gauge surface 11. Active gauge teeth 5 are fixedly arranged on the rear auxiliary blade wing 13 of the blade wing 7, and drag-reducing gauge teeth 3 are fixedly arranged on both the front main blade wing 12 and the rear auxiliary blade wing 13 of the blade wing 7. Active eye-marking teeth 2 are arranged in double rows on the conical surfaces 10 at both ends of the front main blade wing 12 and the rear auxiliary blade wing 13, with a higher tooth arrangement density and better anti-abrasion ability. The alternating arrangement of active gauge teeth 5 and drag-reducing gauge teeth 3 on the gauge surface 11 can effectively improve the impact resistance and anti-abrasion ability of the eye-marking device when passing through hard interlayers or soft and hard interlaced formations.
[0028] like Figure 4 As shown, the diameter of the radial outer envelope line Rw of the drag reduction and gauge guard tooth 3 is larger than the diameter of the outer diameter contour line Rf of the front main blade wing 12 and the outer diameter contour line Rb of the rear auxiliary blade wing 13. The end surface of the drag reduction and gauge guard tooth 3 protrudes from the front main blade wing 12 and the rear auxiliary blade wing 13, and the gauge surface 11 of the body is installed on the blade wing 7, which can effectively reduce friction resistance.
[0029] The active eye-marking teeth 2 and the active gauge teeth 5 are both diamond composite sheets, which improve the active cutting ability through the hard interlayer, and the drag-reducing gauge teeth 3 are hard alloy columns or spherical diamond columns to improve the shock-reducing, drag-reducing and wear-resistant capabilities. The active eye-marking teeth 2 and the active gauge teeth 5 are fixed on the blade wing 7 by brazing, and the drag-reducing gauge teeth 3 are fixed on the blade wing 7 by brazing or inlaying.
[0030] Working principle of the present invention:
[0031] like Figure 1 As shown, when in use, the reamer is connected to the drill tool assembly. When passing through a reduced diameter or irregular borehole formation, the drill tool rotates downward to drill or reams upward to drive the reamer to rotate. The columnar body 11 of the reamer, the active reaming teeth 2 on the conical surfaces 10 at both ends of the front main blade wing 12 and the rear auxiliary blade wing 13 cut the formation to achieve the reaming effect. The drag-reducing and diameter-protecting teeth 3 on the blade wing 7 are used to reduce the wear resistance between the reamer and the well wall and protect the active diameter-protecting teeth 5 from impact damage. The active diameter-protecting teeth 5 protect the blade wing 7 from wear on the diameter-protecting surface 11. The chip removal grooves 4 between adjacent blade wings 7 and the cooling grooves 6 between the front main blade wing 12 and the rear auxiliary blade wing 13 are drilling fluid channels, which are used for cuttings transportation and cooling of the cutting teeth on the front main blade wing 12 and the rear auxiliary blade wing 13, thereby extending the life of the reamer.
[0032] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.
Claims
1. A reamer suitable for soft and hard interlaced and highly abrasive formations, characterized in that: It comprises a lower joint, a columnar body, blades and an upper joint which are arranged in sequence from bottom to top; the blades are evenly distributed on the columnar body along the axial direction of the columnar body, a cooling groove is arranged in the middle of the blades, the cooling groove separates the blades into a front main blade and a rear auxiliary blade, adjacent blades and the well wall annulus form a chip groove, active eye-marking teeth and drag-reducing and diameter-guarding teeth are evenly arranged on the front main blade, and active eye-marking teeth, drag-reducing and diameter-guarding teeth and active diameter-guarding teeth are evenly arranged on the rear auxiliary blade.
2. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The blade is in the shape of a straight blade or a spiral blade.
3. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: There is a radial height difference between the outer diameter contour line of the front main blade wing and the outer diameter contour line of the rear auxiliary blade wing.
4. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The active eye-marking teeth are fixedly arranged on the conical surfaces at both ends, and the active gauge-keeping teeth and the drag-reducing gauge-keeping teeth are fixedly arranged on the gauge-keeping surfaces.
5. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 4, characterized in that: The active gauge teeth are fixedly arranged on the rear auxiliary blade wing, and the drag-reducing gauge teeth are fixedly arranged on the front main blade wing and the rear auxiliary blade wing at the same time. Double rows of active eye-cutting teeth are arranged on the conical surfaces at both ends of the front main blade wing and the rear auxiliary blade wing, and the active gauge teeth and the drag-reducing gauge teeth on the gauge surfaces are arranged alternately.
6. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The diameter of the radial outer envelope of the drag-reducing and gauge-preserving tooth column is greater than the diameter of the outer diameter contour line of the front main blade wing and the outer diameter contour line of the rear auxiliary blade wing.
7. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The active eye-scratching teeth are diamond composite sheets.
8. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The active gauge-keeping teeth are all diamond composite sheets.
9. The reamer suitable for soft-hard interlaced and highly abrasive formations according to claim 1, characterized in that: The drag reducing and gauge maintaining teeth are hard alloy columns or spherical diamond columns.