CN117188974A - Reaming system device, reaming method and application - Google Patents

Abstract

The invention provides a reaming system device, a reaming method and application, wherein the reaming system device comprises a slurry pump, a turntable, a drill rod, a drill bit and a cutting body, wherein the two ends of the cutting body are respectively provided with an upper end part and a lower end part, the upper end part is connected with the drill rod, the lower end part is connected with the drill bit, the outer surface of the cutting body is provided with at least one cutting convex edge, the surface of the cutting convex edge extends over at least two layers of cutting teeth, and the outer surface of the cutting body, which is close to one end of the lower end part, is also provided with a balancing part which is used for providing eccentric force. The invention has simple structure and easy operation, has the function of back reaming, solves the problem of frequent jamming caused by the shrinkage of the diameter and collapse and chipping of the borehole which are easy to occur in a large section of mudstone stratum, and improves the cutting capability.

Description

Reaming system device, reaming method and application

Technical Field

The invention belongs to the technical field of drilling, relates to a reaming tool, and particularly relates to a reaming system device, a reaming method and application.

Background

The horizontal well/sidetrack horizontal well benefit development needs to ensure the size of the well hole annulus, the optimal cement annulus clearance is 19mm, the well hole annulus clearance cannot be required to be smaller than 12.7mm, when the well hole annulus clearance is small, high-quality well cementation quality can be obtained even under the condition of not reaming, but in the long term, the cement ring is too thin, the production life can be influenced, and meanwhile, later perforation or well repair operation and hydraulic fracturing can be caused to be difficult to implement. Reaming of horizontal wells/sidetrack horizontal wells is highly necessary because the cement sheath is too thin, which can cause the cement sheath to fracture and crack more easily, interlayer steam channeling and top water channeling, bottom water coning, etc.

In addition, in the construction process of the slim-hole horizontal well/sidetrack horizontal well, complex and accident frequently occur, particularly, hard brittle mudstone falls down and collapses, so that frequent reaming, electrical measurement, blocking, drilling sticking and the like are caused, the production aging is seriously influenced, and huge economic loss is caused. If the annulus of the well bore can be enlarged, and the well bore is enlarged, the occurrence of lost circulation, complex drilling sticking and accidents can be avoided. Thus, the best way to reduce accidents and complications is to drill through a slim hole reaming chamber.

In order to perform reaming, a reaming tool is required to be developed, and is of a hydraulic ball-throwing type or a hydraulic piston type, so that reaming stability is high, but safety is low, when a deep long open hole section is encountered and a large mudstone stratum exists, drilling sticking accidents are easy to occur, and in addition, the reaming tool is not of an integrated design and is provided with movable parts, well falling, blocking and drilling sticking are easy to occur.

CN106670301a discloses a reaming apparatus and a reaming process, the reaming apparatus comprising a reamer and a loading table, blanks supplied in the loading table extending in a first direction; further comprises: reaming barrel, ejection device and feeding and discharging manipulator; the reaming barrel is arranged on the reamer and is provided with an operation position and a material changing position, and the reaming barrel is driven to move between the operation position and the material changing position, but is not designed integrally, and has a complex structure.

CN204627413U discloses a reaming device for a reamer, including last guide cylinder, telescopic cylinder, go up connecting seat, lower connecting seat and reamer arm, last connecting seat fix the top of telescopic cylinder body and be fixed mutually with last guide cylinder simultaneously, telescopic link lower extreme of telescopic cylinder with lower connecting seat fixed connection, the reamer arm have two at least, every reamer arm includes articulated upper reamer arm and lower reamer arm each other, the upper end of upper reamer arm with last connecting seat articulated mutually, the lower extreme of lower reamer arm with lower connecting seat articulated mutually, but the security is relatively poor, when meetting deep long bore hole section and having big section mudstone stratum, the easy emergence jamming accident.

Therefore, a safer reaming mode and a safer reaming tool are required to be researched, so that the tool is easy to operate, safe and reliable, and meanwhile, when facing a deep long open hole section and a large-section mudstone stratum exists, the anti-grinding capability of the tool can be improved, and the anti-jamming capability of the reaming tool is improved.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide a reaming system device, a reaming method and application, realize the reverse reaming function, solve the problem of frequent jamming caused by shrinkage of the diameter and collapse and chipping of a large-section mudstone stratum, improve the cutting capability, solve the problem of frequent jamming caused by hydraulic pushing and reaming construction, and avoid the formation of a spiral borehole in the reaming process.

To achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a reaming system device, which comprises a slurry pump, a turntable, a drill rod, a drill bit and a cutting body, wherein the two ends of the cutting body are respectively provided with an upper end part and a lower end part, the upper end part is connected with the drill rod, the lower end part is connected with the drill bit, the outer surface of the cutting body is provided with at least one cutting convex edge, the surface of the cutting convex edge extends over at least two layers of cutting teeth, the outer surface of the cutting body, which is close to one end of the lower end part, is also provided with a balance part, and the balance part is used for providing eccentric force.

The reaming system device provided by the invention has the advantages of simple structure, safety and reliability, and a reverse reaming function, and can be used for reaming deep long open hole sections in a large-section mudstone stratum environment; the reaming tool can be prevented from being stuck, has higher anti-grinding capability, improves the cutting strength of the device, and can solve the problem of frequent stuck drilling caused by the fact that the diameter of a borehole is reduced and the drilling tool collapses and falls down easily when a large section of mudstone stratum occurs.

It should be noted that, the cutting convex edge is the cutting core component, the cutting teeth are arranged at the lower part of the cutting edge in the traditional reaming tool, the drilling sticking accident easily occurs in the operation process, and the cutting teeth are fully distributed on the whole cutting edge surface of the cutting edge column in the invention, so that the back reaming function can be used to enlarge the diameter reducing section and reduce the drilling sticking risk under the condition of reducing the diameter of the stratum or mudstone.

As a preferable technical scheme of the invention, the cutting teeth comprise composite sheets and wear-resistant columns which are arranged alternately.

Preferably, the compact comprises a diamond compact.

Preferably, the wear resistant post comprises a cemented carbide post.

Preferably, two adjacent layers of cutting teeth are staggered.

It should be noted that the cutting teeth of each layer in the invention are composed of a plurality of composite sheets and wear-resistant columns which are arranged at intervals, wherein the composite sheets have the functions of cutting stratum, and the wear-resistant columns have the function of protecting diameter and can also play a role of cutting stratum. The cutting teeth are of a multi-layer design, and the number of layers of the cutting teeth can be adaptively increased when deeper and harder formations are encountered. Meanwhile, each layer is staggered with an adjacent layer by a distance of half cutting tooth diameter, so that the upper layer of composite sheet and the lower layer of composite sheet are staggered by a length of half cutting tooth diameter, cutting capability is ensured, and stratum cutting operation can be continuously performed even after the upper layer of composite sheet is worn. In addition, the staggered arrangement of the cutting teeth can cut the stratum more tightly, prevent the stratum from not being cut, improve the anti-grinding capability and strength of the cutting teeth, and can cope with the environment with hard stratum or strong grinding capability. The invention is not particularly required or limited to the type of the diamond compact, and can be exemplified by polycrystalline diamond compacts (polycrystalline diamond compact, PDC), which not only have high hardness, high wear resistance and thermal conductivity of diamond, but also have the strength and impact toughness of hard alloy, thus being an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools.

As a preferable technical scheme of the invention, the at least one cutting convex edge is spirally arranged on part of the surface of the cutting body.

Preferably, the two ends of the cutting convex edge are arc transition structures.

As a preferable technical scheme of the invention, the balancing part comprises a first balancing weight and a second balancing weight which are oppositely arranged, the first balancing weight is positioned on one side of the cutting body where the cutting convex edge is arranged, and the thickness of the first balancing weight is larger than that of the second balancing weight.

In the reaming process, the balance part can reduce vibration caused by eccentric force and prevent the service life of the drill rod and the stability of the borehole from being influenced by overlarge vibration. In the traditional reaming tool, the eccentric force is generated by the balance weight or the balance force arranged at the end of the opposite side of the cutting edge, but the reaming diameter is small, and the hole expansion rate is low.

As a preferable technical scheme of the invention, the upper end part, the cutting body and the lower end part are integrally formed.

Preferably, the upper end part is provided with an upper joint, and the lower end part is provided with a lower joint.

Preferably, the upper joint comprises a square joint or a hexagonal joint.

The upper end part, the cutting body and the lower end part are integrally formed, so that the integral safety performance is improved, the problems that the existing reaming tool is large in movable parts, easy to clamp due to hydraulic pushing, complex in process and frequent in reaming construction are solved, and the functions of simplicity, easiness in operation, safety and reliability of the tool are realized.

As a preferable technical scheme of the invention, a first guide section and a second guide section are sequentially arranged in the cutting body, and the axes of the first guide section and the second guide section are in an eccentric structure.

Preferably, the diameter of the first guide section is greater than the diameter of the second guide section.

It should be noted that, in the cutting body of the present invention, the first guide section and the second guide section are disposed with axes not concentric, so as to realize the eccentric function.

In a second aspect, the present invention provides a reaming method, the reaming method comprising: assembling the reaming system device according to the first aspect, and moving the reaming system device into the stratum to be reamed to sequentially perform reaming and reaming.

The reaming method provided by the invention is simple to operate and high in safety performance, solves the problem of frequent jamming caused by shrinkage of the diameter of a borehole and collapse and chipping of a large-section mudstone stratum, and prevents the risk of jamming in the process of implementing reaming when a reaming tool is lowered.

As a preferable technical scheme of the invention, the reaming method specifically comprises the following steps:

connecting a drill rod at the upper end part of the cutting body, and connecting a drill bit at the lower end part for assembly;

the cutting tool comprises a cutting body, a balance part, a cutting tooth, a drill bit, a cutting rib, a balance part, a cutting tooth and a drill bit, wherein the drill bit is inserted into a stratum to be reamed from one end of the drill bit, the drill bit is started and drives the cutting body to rotate and move downwards, the cutting rib on the surface of the cutting body rotates under the action of the eccentric force provided by the balance part, the cutting tooth on the surface of the cutting rib cuts the stratum to carry out expansion, and the drill bit is stopped after the expansion is finished;

and (III) starting the drill bit again, moving the drill rod upwards, rotating the cutting convex edge on the surface of the cutting body under the action of the eccentric force provided by the balancing part, cutting the stratum by the cutting teeth on the surface of the cutting convex edge, and stopping the drill bit after the reaming is finished, so that reaming is completed.

In the step (i), the upper joint provided at the upper end is movably connected to the drill rod, and the lower joint provided at the lower end is detachably connected to the drill bit.

Preferably, in the step (ii), the drill feeding pressure of the drill is 0 to 3t, for example, 0.02t, 0.05t, 0.50t, 0.55t, 0.60t, 0.65t, 0.80t, 0.90t, 1.00t, 1.25t, 1.50t, 2.00t, 2.20t, 2.50t, 2.80t or 3.00t, but not limited to the recited values, and other non-recited values within the range of values are equally applicable.

Preferably, in the step (II), the speed of the expansion is 0.05-0.2 m/min, for example, 0.05m/min, 0.06m/min, 0.08m/min, 0.10m/min, 0.12m/min, 0.15m/min, 0.16m/min, 0.18m/min or 0.20m/min, but not limited to the values listed, and other values not listed in the range are equally applicable.

In the expanding process, the invention requires uniform drill feeding, the drill feeding pressure is generally 0-2 t, and the drill feeding pressure can be raised to 2-3 t when the drilling length is slower and the drilling is stable; when the reaming speed is high, the fastest speed cannot exceed 0.2m/min, the pressurizing should be stopped rapidly once bouncing occurs in the reaming process, zero bit pressure drilling is adopted, and the pressurizing can be gradually carried out to be normal after the steady back.

Preferably, in the step (iii), the time for the reaming is 6 to 12min, for example, 6min, 7min, 8min, 9min, 10min, 11min or 12min, but not limited to the recited values, and other values not recited in the range of values are equally applicable.

Preferably, in the step (III), the speed of the scratching is 0.4-1.5 m/min, for example, but not limited to, 0.40m/min, 0.45m/min, 0.50m/min, 0.55m/min, 0.60m/min, 0.70m/min, 0.80m/min, 0.90m/min, 1.00m/min, 1.20m/min, 1.30m/min, 1.40m/min or 1.50m/min, and other non-enumerated values within the numerical range are applicable.

In the process of reaming, the drill pipe is lifted to below the square centre, the time required for reaming each single hole is controlled to be 8-10 minutes, and the reaming is carried out at the speed of 0.4-1.5 m/min.

Preferably, the reaming method comprises: before the expanding or reaming is started, the turntable and the slurry pump are sequentially started to start the drill bit.

Preferably, the reaming method further comprises: and after the reaming or the reaming is finished, sequentially shutting down the slurry pump and the rotary table so as to realize the shutting down of the drill bit.

Preferably, the pump pressure of the slurry pump is 0.5 to 3t, for example, 0.5t, 0.6t, 0.8t, 1.0t, 1.2t, 1.5t, 1.8t, 2.0t, 2.3t, 2.5t, 2.8t or 3t, but not limited to the recited values, and other non-recited values within the range of values are equally applicable.

In the hard stratum environment, the pumping pressure of the slurry pump for reaming operation is up to 3t, and in the soft stratum environment, the pumping pressure of the slurry pump is controlled to be 0.5-1 t.

By adopting the reaming method provided by the invention, the reaming is carried out on the stratum with strong grinding capability and easy jamming in deep and hard stratum, and the method specifically comprises the following steps:

(1) The upper end part of the cutting body is movably connected with a drill rod, and the lower end part of the cutting body is detachably connected with a drill bit for assembly;

(2) One end of the drill bit stretches into the stratum to be reamed, the turntable and the slurry pump are sequentially started, the pumping pressure of the slurry pump is 0.5-3 t, the drill bit is started to uniformly feed the drill bit, the drill bit feeding pressure is 0-2 t, the cutting body is driven to rotate and move downwards, the cutting convex edge on the surface of the cutting body rotates under the action of the eccentric force provided by the balancing part, the cutting teeth on the surface of the cutting convex edge cut the stratum, and the stratum is reamed at the speed of 0.05-0.2 m/min;

(3) After each single expansion is finished, the slurry pump is stopped firstly, the rotary table is stopped after the pressure of the slurry pump is zeroed, the slurry pump and the rotary table are stopped sequentially every 3 hours, and the up-and-down movable reaming system device is 3-4 m;

(4) After the expansion is finished, sequentially stopping the slurry pump and the rotary table, and stopping the drill bit to prepare for reaming;

(5) Sequentially starting a rotary table and a slurry pump, starting a drill bit again, controlling the rotating speed of the rotary table to be 70-80 r/min, and lifting the drill rod to the position below the core supplement;

(6) Cutting ribs on the surface of the cutting body rotate under the action of the eccentric force provided by the balancing part, and cutting teeth on the surface of the cutting ribs cut a stratum, so that the stratum is scratched at the speed of 0.4-1.5 m/min, and the time of each single scratching is 6-12 min;

(7) After the reaming is finished, the slurry pump and the rotary table are sequentially turned off, the drill bit is turned off, reaming is completed, if the drilling pressure is continuously carried in the reaming process, the drilling is stopped, and the step building operation is repeated.

In a third aspect, the present invention provides a use of the reaming system assembly of the first aspect, for use in the field of oil and gas well drilling.

The system refers to an equipment system, a device system or a production device.

Compared with the prior art, the invention has the beneficial effects that:

(1) The reaming system device, the reaming method and the application can solve the problem of frequent jamming caused by shrinkage of the diameter and collapse and chipping of the borehole which are easy to occur in a large-section mudstone stratum, prevent the risk of jamming in the reaming process, smoothly complete reaming operation and timely reverse reaming and unlocking when the risk of jamming is encountered;

(2) The reaming system device provided by the invention has strong anti-grinding capability, can solve the problems that the existing tool has weak cutting capability and rapid reaming abrasion for hard stratum, and causes frequent tripping to influence the reaming period, and the intensity of cutting teeth is improved by optimizing the design of cutting teeth so as to cope with the reaming operation of deep well long open hole stratum;

(3) The reaming system device solves the problems of more movable parts, easy clamping of hydraulic pushing, complex process and frequent reaming construction of the existing reaming tool, and realizes the functions of simple tool, easy operation, safety and reliability;

(4) The reaming system device provided by the invention can furthest reduce the vibration problem of the tool in the reaming process, reduce the vibration characteristic of the drill string, prolong the service life of the drill string, and ensure that the diameter of a reaming hole is larger and smoother.

Drawings

FIG. 1 is a schematic view of a cutting body according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a cutting body according to one embodiment of the present invention;

FIG. 3 is a schematic view of a cutting ridge according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a cutting body provided in one embodiment of the present invention.

Wherein 1-the cutting body; 2-upper end; 3-lower end; 4-cutting the convex edges; 5-cutting teeth; 6-a composite sheet; 7-a wear-resistant column; 8-a first balance block; 9-a second balance block; 10-a first guide section; 11-a second guiding section.

Detailed Description

It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

It will be appreciated by those skilled in the art that the present invention necessarily includes the necessary piping, conventional valves and general pumping equipment for achieving the process integrity, but the foregoing is not a major inventive aspect of the present invention, and that the present invention is not particularly limited thereto as the layout may be added by themselves based on the process flow and the equipment configuration options.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

In a specific embodiment, the invention provides a reaming system device, which comprises a slurry pump, a turntable, a drill rod, a drill bit and a cutting body 1, wherein the two ends of the cutting body 1 are respectively provided with an upper end part 2 and a lower end part 3, the upper end part 2 is connected with the drill rod, the lower end part 3 is connected with the drill bit, the outer surface of the cutting body 1 is provided with at least one cutting convex edge 4, the surface of the cutting convex edge 4 extends over at least two layers of cutting teeth 5, and the outer surface of the cutting body 1, which is close to one end of the lower end part 3, is also provided with a balance part for providing eccentric force.

The cutting teeth 5 are fully distributed on the whole cutting edge surface of the cutting edge column, so that the diameter-reducing section can be enlarged by using the reverse reaming function under the condition of reducing the diameter of the stratum or mudstone, and the risk of sticking the drill is reduced.

Further, as shown in fig. 3, the cutting teeth 5 include a composite sheet 6 and a wear-resistant post 7 arranged alternately. The compact 6 comprises a diamond compact 6. The wear resistant column 7 comprises a cemented carbide column. The adjacent two layers of cutting teeth 5 are staggered mutually. The function of the composite sheet 6 in the invention is to cut the stratum, the function of the wear-resisting column 7 is to keep the diameter, and the function of cutting the stratum can be also realized. The cutting teeth 5 are designed in a multi-layer manner, and the upper layer of composite sheet 6 and the lower layer of composite sheet 6 are staggered by half the diameter length of the cutting teeth 5 so as to ensure cutting capability, and even after the upper layer of composite sheet 6 is worn, stratum cutting operation can be continuously performed.

Further, the at least one cutting ridge 4 is spirally disposed on a part of the surface of the cutting body 1. The two ends of the cutting convex ridge 4 are arc transition structures.

Further, as shown in fig. 2, the balancing portion includes a first balancing weight 8 and a second balancing weight 9 that are disposed opposite to each other, the first balancing weight 8 is located at a side of the cutting body 1 where the cutting ridge 4 is disposed, and a thickness of the first balancing weight 8 is greater than a thickness of the second balancing weight 9. According to the invention, the counter weights are arranged on the two opposite sides of the cutting body 1, the thickness of the first counter weight 8 on the same side as the cutting convex edge 4 is larger than that of the second counter weight 9 on the opposite side, so that the eccentric force of the eccentric tool is balanced, the expansion rate of the hole is improved, the vibration caused by the eccentric force can be reduced, and the service life of the drill rod and the stability of the well hole are prevented from being influenced due to overlarge vibration.

Further, the upper end 2, the cutting body 1 and the lower end 3 are integrally formed. The upper end part 2 is provided with an upper joint, and the lower end part 3 is provided with a lower joint. The upper joint comprises a square joint or a hexagonal joint. The upper end part 2, the cutting body 1 and the lower end part 3 are of an integrated structure, so that the integral safety performance is improved, and the problems of frequent reaming construction due to the fact that the existing reaming tool has a plurality of movable parts and is easy to clamp due to hydraulic pushing are solved.

Further, as shown in fig. 4, a first guiding section 10 and a second guiding section 11 are sequentially disposed inside the cutting body 1, and the axes of the first guiding section 10 and the second guiding section 11 are eccentric. The diameter of the first guide section 10 is greater than the diameter of the second guide section 11. The first guide section 10 and the second guide section 11 in the cutting body 1 of the present invention are arranged with axes not concentric to realize an eccentric function.

In another embodiment, the invention provides a reaming method, which specifically comprises the following steps:

(1) The upper end part 2 of the cutting body 1 is movably connected with a drill rod, and the lower end part 3 is detachably connected with a drill bit for assembly;

(2) One end of a drill bit stretches into a ground to be reamed, a turntable and a slurry pump are sequentially started, the pump pressure of the slurry pump is 0.5-3 t, the drill bit is started to uniformly feed, the drill bit feeding pressure is 0-2 t, the cutting body 1 is driven to rotate and move downwards, the cutting convex edge 4 on the surface of the cutting body 1 rotates under the action of eccentric force provided by a balancing part, the cutting teeth 5 on the surface of the cutting convex edge 4 cut the ground, and the stratum is reamed at the speed of 0.05-0.2 m/min; after each single expanding is finished, the slurry pump is stopped firstly, the rotary table is stopped after the pressure of the slurry pump is reset, the slurry pump and the rotary table are stopped sequentially every 3 hours, the up-and-down movable reaming system device is 3-4 m, after the expanding is finished, the slurry pump and the rotary table are stopped sequentially, and the drill bit is stopped for preparing reaming;

(2) The rotary table and the slurry pump are sequentially started, the drill bit is started again, the rotary speed of the rotary table is controlled to be 70-80 r/min, the drill rod is lifted to the lower part of the bushing, the cutting ribs 4 on the surface of the cutting body 1 rotate under the action of the eccentric force provided by the balancing part, the cutting teeth 5 on the surface of the cutting ribs 4 cut the stratum, the reaming is carried out at the speed of 0.4-1.5 m/min, the time of each single reaming is 6-12 min, the slurry pump and the rotary table are sequentially stopped after the reaming is finished, the drill bit is stopped, and the reaming is completed.

Example 1

The embodiment provides a reaming system device, which comprises a slurry pump, a turntable, a drill rod, a drill bit and a cutting body 1, wherein the two ends of the cutting body 1 are respectively provided with an upper end 2 and a lower end 3 which are integrally formed, the upper end 2 is connected with the drill rod, and the lower end 3 is connected with the drill bit. The inside of the cutting body 1 is provided with a first guide section 10 and a second guide section 11 in sequence, and the axes of the first guide section 10 and the second guide section 11 are in an eccentric structure.

Five cutting ribs 4 are spirally arranged on the outer surface of a part of the cutting body 1, two ends of each cutting rib 4 are of arc transition structures, two layers of cutting teeth 5 which are staggered mutually are distributed on the surface of each cutting rib 4, and each cutting tooth 5 comprises PDC composite sheets 6 and hard alloy columns which are arranged alternately. The number of PDC composite sheets 6 in the first layer is 50, the number of cemented carbide pillars is 45, the number of PDC composite sheets 6 in the second layer is 45, and the number of cemented carbide pillars is 50. The PDC composite sheet 6 functions to cut the formation, and the cemented carbide pillars function as gage, and also function to cut the formation.

The outer surface of the cutting body 1 near the end of the lower end portion 3 is also provided with a balancing portion for providing an eccentric force. The balancing part comprises a first balancing weight 8 and a second balancing weight 9 which are oppositely arranged, the first balancing weight 8 is positioned on one side of the cutting body 1, on which the cutting convex edge 4 is arranged, and the thickness of the first balancing weight 8 is larger than that of the second balancing weight 9. According to the invention, the counter weights are arranged on the two opposite sides of the cutting body 1, the thickness of the first counter weight 8 on the same side as the cutting convex edge 4 is larger than that of the second counter weight 9 on the opposite side, the eccentric force of the eccentric tool is balanced, the expansion rate of the hole is improved, and the vibration caused by the eccentric force can be reduced.

Example 2

The embodiment provides a reaming system device, which comprises a slurry pump, a turntable, a drill rod, a drill bit and a cutting body 1, wherein the two ends of the cutting body 1 are respectively provided with an upper end 2 and a lower end 3 which are integrally formed, the upper end 2 is connected with the drill rod, and the lower end 3 is connected with the drill bit. The inside of the cutting body 1 is provided with a first guide section 10 and a second guide section 11 in sequence, and the axes of the first guide section 10 and the second guide section 11 are in an eccentric structure.

Five cutting ribs 4 are spirally arranged on the outer surface of a part of the cutting body 1, two ends of each cutting rib 4 are of arc transition structures, the surfaces of the cutting ribs 4 are distributed over three layers of cutting teeth 5 which are staggered mutually, and the cutting teeth 5 comprise PDC composite sheets 6 and hard alloy columns which are arranged alternately. The number of PDC composite sheets 6 in the first layer is 65, the number of cemented carbide pillars is 50, the number of PDC composite sheets 6 in the second layer is 50, the number of cemented carbide pillars is 40, the number of PDC composite sheets 6 in the third layer is 40, and the number of cemented carbide pillars is 30. The PDC composite sheet 6 functions to cut the formation, and the cemented carbide pillars function as gage, and also function to cut the formation.

The outer surface of the cutting body 1 near the end of the lower end portion 3 is also provided with a balancing portion for providing an eccentric force. The balancing part comprises a first balancing weight 8 and a second balancing weight 9 which are oppositely arranged, the first balancing weight 8 is positioned on one side of the cutting body 1, on which the cutting convex edge 4 is arranged, and the thickness of the first balancing weight 8 is larger than that of the second balancing weight 9. According to the invention, the counter weights are arranged on the two opposite sides of the cutting body 1, the thickness of the first counter weight 8 on the same side as the cutting convex edge 4 is larger than that of the second counter weight 9 on the opposite side, the eccentric force of the eccentric tool is balanced, the expansion rate of the hole is improved, and the vibration caused by the eccentric force can be reduced.

Application example1

In this application example, the reaming system device provided in embodiment 1 is used to perform reaming work in shallow and medium soft strata, and the reaming work specifically includes the following steps:

(1) The upper end part 2 of the cutting body 1 is movably connected with a drill rod, and the lower end part 3 is detachably connected with a drill bit for assembly;

(2) One end of a drill bit stretches into a stratum to be reamed, a turntable and a slurry pump are sequentially started, the pump pressure of the slurry pump is 1.8t, the drill bit is started to uniformly feed, the drill feeding pressure of the drill bit is 1t, the cutting body 1 is driven to rotate and move downwards, the cutting ribs 4 on the surface of the cutting body 1 rotate under the action of eccentric force provided by a balancing part, the cutting teeth 5 on the surface of the cutting ribs 4 cut the stratum, and the stratum is reamed at the speed of 0.2m/min;

(3) After each single expansion is finished, the slurry pump is stopped firstly, the rotary table is stopped after the pressure of the slurry pump is zeroed, the slurry pump and the rotary table are stopped sequentially every 3 hours, and the up-and-down movable reaming system device is 3-4 m;

(4) After the expansion is finished, sequentially stopping the slurry pump and the rotary table, and stopping the drill bit to prepare for reaming;

(5) Sequentially starting a rotary table and a slurry pump, starting a drill bit again, controlling the rotating speed of the rotary table to be 80r/min, and lifting the drill rod to the position below the core supplement;

(6) The cutting convex edge 4 on the surface of the cutting body 1 rotates under the action of the eccentric force provided by the balancing part, the cutting teeth 5 on the surface of the cutting convex edge 4 cut the stratum, and the reaming is carried out at the speed of 1m/min, and the time of each single reaming is 8min;

(7) After the reaming is finished, the slurry pump and the rotary table are sequentially turned off, the drill bit is turned off, reaming is completed, if the drilling pressure is continuously carried in the reaming process, the drilling is stopped, and the step building operation is repeated.

Application example 2

In this application example, the reaming system device provided in embodiment 2 performs reaming work in deep and hard formations, where the reaming work specifically includes the following steps:

(1) The upper end part 2 of the cutting body 1 is movably connected with a drill rod, and the lower end part 3 is detachably connected with a drill bit for assembly;

(2) One end of a drill bit stretches into a stratum to be reamed, a turntable and a slurry pump are sequentially started, the pump pressure of the slurry pump is 3t, the drill bit is started to evenly feed, the drill feeding pressure of the drill bit is 2t, the cutting body 1 is driven to rotate and move downwards, the cutting ribs 4 on the surface of the cutting body 1 rotate under the action of the eccentric force provided by the balancing part, the cutting teeth 5 on the surface of the cutting ribs 4 cut the stratum, and the stratum is reamed at the speed of 0.15 m/min;

(3) After each single expansion is finished, the slurry pump is stopped firstly, the rotary table is stopped after the pressure of the slurry pump is zeroed, the slurry pump and the rotary table are stopped sequentially every 3 hours, and the up-and-down movable reaming system device is 3-4 m;

(4) After the expansion is finished, sequentially stopping the slurry pump and the rotary table, and stopping the drill bit to prepare for reaming;

(5) Sequentially starting a rotary table and a slurry pump, starting a drill bit again, controlling the rotating speed of the rotary table to be 70r/min, and lifting the drill rod to the position below the core supplement;

(6) The cutting convex edge 4 on the surface of the cutting body 1 rotates under the action of the eccentric force provided by the balancing part, the cutting teeth 5 on the surface of the cutting convex edge 4 cut the stratum, and the reaming is carried out at the speed of 1m/min, and the time of each single reaming is 7min;

(7) After the reaming is finished, the slurry pump and the rotary table are sequentially turned off, the drill bit is turned off, reaming is completed, if the drilling pressure is continuously carried in the reaming process, the drilling is stopped, and the step building operation is repeated.

The invention adopts the following anti-blocking measures in the reaming process:

(1) The performance of the drilling fluid must meet the design requirements to keep the well wall stable;

(2) Before the start of the expansion, the turntable is started, the slurry pump is started after the stabilization, and after a single piece is expanded, the slurry pump is stopped, and then the turntable is stopped;

(3) The resting time of the intra-well cutting body 1 must not exceed 3min, otherwise all measures must be taken to perform the activity;

(4) Continuously moving a reaming system device when circulating mud, wherein the lifting and lowering distance is not less than 2m;

(5) When the upward reaming system device encounters resistance, hard lifting is strictly prevented, and the slurry pump is started to movably cut the body 1 under the condition of permission, but the displacement is required to be controlled, so that the drilling jam caused by leakage is prevented;

(7) The cutting body 1 avoids maintenance and equipment replacement as much as possible when in the pit;

(8) The wellhead operation is careful, and underground junk is prevented;

(9) Once serious accident of sticking the drill occurs, the reverse reaming mode is adopted, and the drilling section is repeatedly reamed and locked until the tool can come in and go out.

The reaming system device provided by the invention adopts an integrated molding design, and has the characteristics of simple tool, easiness in operation, safety and reliability; the reaming operation of deep well long open hole stratum is dealt with by optimizing tooth arrangement design and improving the strength of the cutting teeth 5, and when the drilling sticking risk is encountered, the drilling sticking can be timely reversed and relieved; in addition, the vibration problem in the reaming process is reduced to the greatest extent, the diameter of a reaming borehole is ensured to be larger, the problem that the drilling sticking frequently occurs due to the fact that the diameter of the borehole is reduced and the drilling sticking easily occurs due to the fact that the drilling sticking easily occurs in a large section of mudstone stratum and the drilling sticking easily occurs due to the fact that the drilling sticking easily occurs in the reaming process is avoided.

The applicant declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims (10)

1. The utility model provides a reaming system device, includes slush pump, carousel, drilling rod, drill bit and cutting body, its characterized in that, the both ends of cutting body are provided with upper end and lower tip respectively, upper end connection drilling rod, lower end connection drill bit, the surface of cutting body is provided with at least one and cuts protruding stupefied, the surface of cutting protruding stupefied extends over the cutting tooth of at least two-layer, the surface that the cutting body is close to lower tip one end still is provided with balanced portion, balanced portion be used for providing eccentric force.

2. The reaming system assembly of claim 1, wherein said cutting teeth comprise alternating composite sheets and wear columns;

preferably, the compact comprises a diamond compact;

preferably, the wear resistant post comprises a cemented carbide post;

preferably, two adjacent layers of cutting teeth are staggered.

3. The reaming system assembly of claim 1 or 2, wherein the at least one cutting burr is helically disposed on a portion of the surface of the cutting body;

preferably, the two ends of the cutting convex edge are arc transition structures.

4. A reaming system according to any one of claims 1-3, characterized in that said balancing portion comprises a first balancing weight and a second balancing weight which are arranged opposite to each other, said first balancing weight being located on a side of said cutting body where said cutting ridge is provided, and said first balancing weight having a thickness greater than a thickness of said second balancing weight.

5. The reaming system assembly of any one of claims 1-4, wherein said upper end, said cutting body, and said lower end are integrally formed;

preferably, the upper end part is provided with an upper joint, and the lower end part is provided with a lower joint;

preferably, the upper joint comprises a square joint or a hexagonal joint.

6. The reaming system device according to any one of claims 1-5, characterized in that a first guide section and a second guide section are sequentially provided inside the cutting body, and the axes of the first guide section and the second guide section are in an eccentric structure;

preferably, the diameter of the first guide section is greater than the diameter of the second guide section.

7. A reaming method, characterized in that the reaming method comprises: assembling the reaming system assembly of any one of claims 1-6, and moving the assembly into the formation to be reamed to sequentially perform reaming and reaming.

8. The reaming method according to claim 7, characterized in that it comprises the following steps:

connecting a drill rod at the upper end part of the cutting body, and connecting a drill bit at the lower end part for assembly;

the cutting tool comprises a cutting body, a balance part, a cutting tooth, a drill bit, a cutting rib, a balance part, a cutting tooth and a drill bit, wherein the drill bit is inserted into a stratum to be reamed from one end of the drill bit, the drill bit is started and drives the cutting body to rotate and move downwards, the cutting rib on the surface of the cutting body rotates under the action of the eccentric force provided by the balance part, the cutting tooth on the surface of the cutting rib cuts the stratum to carry out expansion, and the drill bit is stopped after the expansion is finished;

and (III) starting the drill bit again, moving the drill rod upwards, rotating the cutting convex edge on the surface of the cutting body under the action of the eccentric force provided by the balancing part, cutting the stratum by the cutting teeth on the surface of the cutting convex edge, and stopping the drill bit after the reaming is finished, so that reaming is completed.

9. The reaming method according to claim 8, wherein in step (i), said upper joint provided at said upper end portion is movably connected to said drill pipe, and said lower joint provided at said lower end portion is detachably connected to said drill bit;

preferably, in the step (ii), the weight of the drill bit is 0 to 3t during the expansion process;

preferably, in the step (II), the speed of the expansion is 0.05-0.2 m/min;

preferably, in the step (III), the time for reaming is 6-12 min;

preferably, in the step (III), the speed of the reaming is 0.4-1.5 m/min;

preferably, the reaming method comprises: before the expanding or reaming is started, the turntable and the slurry pump are sequentially started to realize the starting of the drill bit;

preferably, the reaming method further comprises: after the reaming or reaming is finished, sequentially shutting down the slurry pump and the rotary table to realize the shutting down of the drill bit;

preferably, the pump pressure of the slurry pump is 0.5-3 t.

10. Use of a reaming system assembly according to any one of claims 1-6, characterized in that the reaming system assembly is used in the field of oil and gas well drilling.