阅读说明：本技术 一种适用于钻通孔的微型牙轮可钻性测试钻头 (Miniature roller drillability test drill bit suitable for drilling through hole ) 是由 石祥超 杨昕昊 陈帅 孟英峰 胡云磊 李清鲮 李皋 于 2021-08-16 设计创作，主要内容包括：本发明涉及油气井钻井工程岩石可钻性评价领域,尤其涉及一种适用于钻通孔的微型牙轮可钻性测试钻头,包括钻头体,钻头体一端转动连接有若干牙轮刀片,若干牙轮刀片等间隔排列,若干牙轮刀片共轴设置,若干牙轮刀片与钻头体可拆卸连接；牙轮刀片用于破碎岩石试样,若干牙轮刀片之间设有间隔固定部,间隔固定部与钻头体固定连接；钻头体另一端设有与实验设备固定用的固定部。本发明可以实现稳定破碎岩石与通孔钻进的效果,从而大幅提高岩石可钻性评价的可靠性。(The invention relates to the field of rock drillability evaluation of oil and gas well drilling engineering, in particular to a micro roller drillability test drill bit suitable for drilling through holes, which comprises a drill bit body, wherein one end of the drill bit body is rotatably connected with a plurality of roller blades, the plurality of roller blades are arranged at equal intervals, the plurality of roller blades are coaxially arranged, and the plurality of roller blades are detachably connected with the drill bit body; the roller blades are used for crushing a rock sample, and interval fixing parts are arranged among the plurality of roller blades and fixedly connected with the bit body; the other end of the drill bit body is provided with a fixing part for fixing the experimental equipment. The invention can realize the effect of stabilizing broken rocks and drilling through holes, thereby greatly improving the reliability of rock drillability evaluation.)

1. The utility model provides a micro-cone drillability test drill bit suitable for bore through-hole which characterized in that: the drill bit comprises a drill bit body (1), wherein one end of the drill bit body (1) is rotatably connected with a plurality of cone blades (3), the cone blades (3) are arranged at equal intervals, the cone blades (3) are coaxially arranged, and the cone blades (3) are detachably connected with the drill bit body (1);

the roller blades (3) are used for crushing a rock sample, and interval fixing parts are arranged among the roller blades (3) and are fixedly connected with the bit body (1);

the other end of the drill bit body (1) is provided with a fixing part for fixing the experimental equipment.

2. The micro-cone drillability test bit according to claim 1, further comprising: and a plurality of cone sharp teeth are arranged on the edge part of the cone blade (3) in the circumferential direction.

3. The micro-cone drillability test bit according to claim 1, further comprising: the center of each cone blade (3) is provided with a center hole, and the cone blades (3) are rotatably connected with the interval fixing parts through the center holes.

4. A micro-cone drillability test bit adapted for drilling through-holes according to claim 3, wherein: the interval fixing part comprises a plurality of rib plates (7) which are arranged at equal intervals, the outer sides of the two outermost rib plates (7) are respectively provided with an outer wall (8), assembly holes (5) are formed in the rib plates (7) and the outer walls (8), one ends of the rib plates (7) and the outer walls (8) far away from the roller blades (3) are fixedly connected with the drill body (1), rotation connecting parts are arranged in the assembly holes (5), and the roller blades (3) are rotatably connected with the rib plates (7) and the outer walls (8) through center holes, the assembly holes (5) and the rotation connecting parts.

5. The micro-cone drillability test bit according to claim 4, further comprising: rotate connecting portion include with centre bore, pilot hole (5) internal diameter looks adaptation's fluting cylinder head bolt (4), external screw thread (9) have been seted up to fluting cylinder head bolt (4) one end, fluting cylinder head bolt (4) are seted up the tip of external screw thread (9) is equipped with hexagon nut (2), internal thread (10) have been seted up at hexagon nut (2) center, external screw thread (9), internal thread (10) looks adaptation.

6. The micro-cone drillability test bit according to claim 1, further comprising: the fixing part comprises a bit body thread (6), and the bit body thread (6) is positioned at one end of the bit body (1) far away from the roller blade (3).

Technical Field

The invention relates to the field of rock drillability evaluation of oil and gas well drilling engineering, in particular to a micro roller drillability test drill bit suitable for drilling through holes.

Background

With continuous progress of scientific technology, development of oil and gas resources shows a trend of stable development to deep wells and ultra-deep wells, however, in the drilling process of the deep wells and the ultra-deep wells, the situation that the drillability value of rock is high easily occurs in deep strata encountered by drilling, so that scientific researchers are required to reasonably evaluate the drillability value of the rock, and therefore, constructive guidance is provided for field production, and otherwise, efficient crushing of the rock and improvement of the drilling efficiency are seriously influenced.

The industrial standard SY/T5426-2016 & lt & ltPetroleum and gas drilling engineering rock drillability determination and classification & gt provides provisions for testing drill bits, but when the drill bits suggested by the standard are adopted to carry out the rock drillability determination, the repeatability experiment results of the same rock and the same conditions show larger difference, and the difference of the bottom hole mode is also obvious; meanwhile, the drill bit is limited in a bit body structure and cannot realize through hole drilling, and the relationship of force, torque and the like is difficult to deeply research. In summary, the drill bit does not provide effective support for rock drillability evaluation.

In summary, there is a need to design a micro roller drillability test drill bit suitable for drilling through holes, so as to obtain reliable repeatability experiment results and a bottom hole mode with stable rules, and to realize through hole drilling, thereby further performing deep research on the relationship between force, torque and the like.

Disclosure of Invention

The invention aims to provide a micro roller drillability test drill bit suitable for drilling through holes, which solves the problems and realizes the effects of stabilizing broken rocks and drilling through holes, thereby greatly improving the reliability of rock drillability evaluation.

In order to achieve the purpose, the invention provides the following scheme:

a micro roller drillability test drill bit suitable for drilling through holes comprises a drill bit body, wherein one end of the drill bit body is rotatably connected with a plurality of roller blades which are arranged at equal intervals, the plurality of roller blades are coaxially arranged, and the plurality of roller blades are detachably connected with the drill bit body;

the roller blades are used for crushing rock samples, and interval fixing parts are arranged among the roller blades and fixedly connected with the bit body;

and the other end of the drill bit body is provided with a fixing part for fixing the experimental equipment.

Preferably, a plurality of cone sharp teeth are circumferentially arranged on the edge part of the cone blade.

Preferably, a center hole is formed in the center of each roller blade, and the plurality of roller blades are rotatably connected with the interval fixing part through the center holes.

Preferably, the interval fixing part comprises a plurality of rib plates arranged at equal intervals, outer walls are respectively arranged on the outer sides of the two outermost rib plates, assembly holes are formed in the rib plates and the outer walls, one ends, far away from the roller blades, of the rib plates and the outer walls are fixedly connected with the drill bit body, rotary connecting parts are arranged in the assembly holes, and the roller blades are rotatably connected with the rib plates and the outer walls through the central holes, the assembly holes and the rotary connecting parts.

Preferably, the rotating connecting portion comprises a slotted cylinder head bolt matched with the inner diameter of the central hole and the inner diameter of the assembling hole, an external thread is arranged at one end of the slotted cylinder head bolt, a hexagon nut is arranged at the end part of the slotted cylinder head bolt provided with the external thread, an internal thread is arranged at the center of the hexagon nut, and the external thread and the internal thread are matched.

Preferably, the fixing part comprises a bit body thread, and the bit body thread is positioned at one end of the bit body far away from the roller blade.

The invention has the following technical effects:

(1) the drill bit has high reliability and good stability. The structure that a plurality of ribbed plates are arranged on the drill body at equal intervals is beneficial to uniformly separating the roller blades on one hand, and is beneficial to reducing unnecessary transverse vibration of the roller blades on the other hand, so that the stability of the test drill bit in the experimental process is greatly improved, the result is reliable in repeated experiments of the same rock sample and the same condition, and the bottom hole mode of the rock sample is stable under the same condition.

(2) The drill bit can realize through hole drilling. The axial maximum diameter of the bit for testing the drillability of the miniature cone is the diameter of the cone blade, the cone blade and the rock sample are always interacted in the process of crushing the rock sample, accidental collision caused by the action of the bit body and the rock sample cannot occur, and the deep research on the relation of force, torque and the like is facilitated.

(3) The drilling depth can meet the requirements of different experimental facilities. The drilling depth of the micro roller drillability test drill bit is determined by the axial displacement parameters of the rock drillability test device, the micro roller drillability test drill bit is not influenced by the size of the drill bit body, and the micro roller drillability test drill bit can be adjusted according to the axial displacement parameters of different test equipment, so that the test requirements of different test equipment are met.

(4) The maintenance and replacement of the drill bit are simple and easy. In the rock drillability experiment, the damage of the drill bit mostly occurs in the plastic and brittle failure of the shaft and the tooth point abrasion of the roller bit, and when the damage occurs, the micro roller drillability test drill bit can simply and quickly solve the problems by knocking the brick head body and prying a gap between the hexagon nut and the drill bit to enable the hexagon nut to fall off, unscrewing the slotted cylinder bolt and replacing the roller bit.

(5) An important step in micro-testing drill bits is taken. The blank of the micro roller drillability test drill bit in the field of rock drillability evaluation of oil and gas well drilling engineering is filled.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic front view of a bit body according to the present invention;

FIG. 4 is a schematic view of a roller cone blade configuration;

FIG. 5 is a schematic view of a slotted stud structure;

FIG. 6 is a schematic structural view of a hexagonal nut;

FIG. 7 is a left side view schematic of a bit body;

FIG. 8 is a schematic diagram of a right-side view of the bit body.

Wherein, 1, a drill body; 2. a hexagonal nut; 3. a roller blade; 4. slotting cylinder head bolts; 5. an assembly hole; 6. bit body threads; 7. a rib plate; 8. an outer wall; 9. an external thread; 10. an internal thread.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-8, the invention provides a micro roller drillability test drill bit suitable for drilling through holes, which comprises a drill bit body 1, wherein one end of the drill bit body 1 is rotatably connected with a plurality of roller blades 3, the plurality of roller blades 3 are arranged at equal intervals, the plurality of roller blades 3 are coaxially arranged, and the plurality of roller blades 3 are detachably connected with the drill bit body 1;

the roller blades 3 are used for crushing rock samples, and interval fixing parts are arranged among the roller blades 3 and fixedly connected with the bit body 1;

the other end of the drill bit body 1 is provided with a fixing part for fixing the experimental equipment.

A regular hexagon structure with a certain height is processed at the axial middle part of the drill bit body 1; the regular hexagon structure is screwed by a wrench, so that the drill body 1 can be screwed or unscrewed on the rock drillability experimental device conveniently.

According to a further optimized scheme, a plurality of cone sharp teeth are circumferentially arranged on the edge of the cone blade 3.

According to the further optimized scheme, a center hole is formed in the center of each cone blade 3, and the cone blades 3 are rotatably connected with the interval fixing parts through the center holes. The diameter of the roller blade 3 is the maximum diameter of the bit body 1, so that through hole drilling can be realized, the diameter of the roller blade 3 is 32mm, the wall thickness of the roller blade 3 is 2.5mm, and the number of teeth of the roller teeth is 18.

Further optimize the scheme, the interval fixed part includes floor 7 that a plurality of equidistant settings set up, and the outside of two floor 7 in the outside is provided with outer wall 8 respectively, has seted up pilot hole 5 on floor 7, the outer wall 8, and the one end and the drill bit 1 fixed connection of roller blade 3 are kept away from to floor 7, outer wall 8, is equipped with in the pilot hole 5 and rotates connecting portion, and roller blade 3 passes through centre bore, pilot hole 5, rotates connecting portion and floor 7, outer wall 8 and rotates and be connected.

Further optimization scheme rotates connecting portion and includes 4 with the fluting cylindric head bolt of 5 internal diameter looks adaptations of centre bore, pilot hole, and external screw thread 9 has been seted up to 4 one ends of fluting cylindric head bolt, and the tip that external screw thread 9 was seted up to fluting cylindric head bolt 4 is equipped with hexagon nut 2, and internal thread 10, external screw thread 9, internal thread 10 looks adaptations have been seted up at hexagon nut 2 center.

The slotted cylinder head bolt 4 is not provided with one end of the external thread 9, the hexagon nut 2 is respectively embedded into the outer wall 8, the outer walls 8 at the two ends support and protect the roller blades 3, the slotted cylinder head bolt 4 and the hexagon nut 2, the plurality of rib plates 7 are used for separating the plurality of roller blades 3, and meanwhile the plurality of rib plates 7 can reduce and avoid the transverse vibration of the plurality of roller blades 3 during the rock drillability experiment.

In a further optimized scheme, the fixing part comprises bit body threads 6, and the bit body threads 6 are positioned at one end of the bit body 1 far away from the roller blade 3. The axial bottom of the bit body 1 is provided with a bit body thread 6 and a tool withdrawal groove; the drill bit body threads 6 can be installed in cooperation with a rock drillability experimental device; the tool withdrawal groove is convenient for withdrawing the tool after the lathe processes threads.

The working process of the invention is as follows:

the micro cone drillability test drill bit is screwed to the rock drillability test device through the drill bit body threads 6, the number of the cone blades 3 is six, and the rock drillability test device is controlled to move the micro cone drillability test drill bit along the axial direction, so that the cone blades 3 are just contacted with a rock sample; the rock drillability experimental device sends signals to drive the miniature roller cone drillability test drill bit to rotate, six roller cone blades 3 crush a rock sample through revolution and rotation, five rib plates 7 reduce and avoid transverse vibration generated in rigid contact between the roller cone blades 3 and the rock sample, and outer walls 8 at two ends support and protect the bit body 1 and the roller cone blades 3 to normally work; after the experiment is finished, if the tooth point of the roller blade 3 is abraded or the slotted cylinder head bolt 4 is damaged, the problems can be solved by automatically falling off the hexagon nut 2, unscrewing the slotted cylinder head bolt 4 and replacing the roller blade 3.

In the scheme, the middle part of the slotted cylinder head bolt 4 in the axial direction is a smooth straight rod with a certain length, and lubricating oil is coated on the surface of the straight rod; a plurality of assembling holes 5 of the bit body 1 and holes in the center of the roller blade 3 are smooth round holes, and lubricating oil is smeared on the surfaces of the round holes; the friction between the straight rod and the hole is reduced in the assembling and working processes.

According to the scheme, the outer walls 8 at the two ends of the bit body 1 are designed with the inner hexagonal groove and the circular groove, the hexagonal nut 2 is matched into the inner hexagonal groove during assembly, the cylindrical head of the slotted cylindrical head bolt 4 is matched into the circular groove, so that the structure of the micro roller drillability test drill bit is tight during assembly, and meanwhile, the abrasion of the slotted cylindrical head bolt 4 and the hexagonal nut 2 during experiment is reduced.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.