CN111535750A - Drill bit and drilling method of drilling equipment - Google Patents

Abstract

The invention provides a drill bit and a drilling method of drilling equipment. The drill bit body is internally provided with an inner cavity, and the inner cavity is opened at the bottom of the drill bit body. The blade is provided with a through hole which penetrates through the two side surfaces and is communicated with the inner cavity. Wherein the drill bit is configured to be decomposed by a decomposition liquid, and the decomposition liquid flows through the drill bit through the inner cavity and the through hole. Through the design, when the drill bit provided by the invention drills to a preset depth, an operator can convey the decomposition liquid to the inner cavity of the drill bit body and flow out from the through holes on the blades, so that the drill bit is decomposed. Moreover, the invention can increase the contact area of the decomposition liquid and the drill bit in the dissolving process by utilizing the through holes so as to accelerate the dissolving speed.

Description

Drill bit and drilling method of drilling equipment

Technical Field

The invention relates to the technical field of petroleum drilling equipment, in particular to a drill bit and a drilling method of the drilling equipment.

Background

As petroleum exploration drills deeper into the wellbore, and into areas of more complex lithology, the demand in the art for petroleum drill bits has become increasingly greater. The existing petroleum exploration drilling process is complicated and generally divided into several times of drilling, each time of drilling needs to be started and stopped for many times, and the drilling is started and stopped for many times, so that the underground risk is easily increased, and the labor intensity is increased. In addition, the existing process technology needs to put a casing for well cementation after a drill bit drills. The prior art has the defect of long construction period. Particularly for high-pressure or ultrahigh-pressure gas wells, underground accidents and even blowout can be caused by careless tripping of the drill.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the above-mentioned deficiencies of the prior art by providing a drill bit that can be dissolved after drilling to a predetermined depth to reduce tripping.

Another main object of the present invention is to overcome at least one of the drawbacks of the prior art described above and to provide a drilling method using a drilling device of the type described above.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to one aspect of the invention, a drill bit is provided, which comprises a bit body and a blade, wherein the blade is provided with an end surface and two side surfaces, the end surface is arranged at a distance from the bit body, and the two side surfaces are respectively connected between two sides of the end surface and the bit body. The drill bit body is internally provided with an inner cavity, and the inner cavity is opened at the bottom of the drill bit body. The blade is provided with a through hole, the through hole penetrates through the two side faces, and the through hole is communicated with the inner cavity. Wherein the drill bit is configured to be decomposed by a decomposition liquid, and the decomposition liquid flows through the drill bit through the inner cavity and the through hole.

According to one embodiment of the invention, the blade has a tip section at the top of the bit body. The middle part of top section has outer arc portion, outer arc portion compare the remaining part of top section is apart from the distance of drill bit body is the biggest, the through-hole contains first through-hole, first through-hole is seted up in outer arc portion. And/or the top section is provided with an outer side part positioned on the periphery of the top part of the drill bit body, and the through hole comprises a second through hole which is opened on the outer side part. And/or the top section is provided with a central part extending towards the top center of the drill bit body, and the through hole comprises a third through hole which is opened in the central part.

According to one embodiment of the invention, the blade has a top section located at the top of the bit body, the top section has an outer arc portion in the middle, the outer arc portion has a maximum distance from the bit body compared with the rest of the top section, and the through hole includes a first through hole opened at the outer arc portion. The blade is provided with a blade, the blade is provided with an outer arc part, the blade is provided with a blade hole, one end of the blade hole is opened on the end surface of the outer arc part, and the other end of the blade hole is communicated with the inner cavity. Wherein, the first through hole is communicated with the water hole inside the blade.

According to one embodiment of the present invention, the blade has a tip section located at the top of the bit body, the tip section having an outer arc portion located at a maximum distance from the bit body than the rest of the tip section, an outer side portion located at the top periphery of the bit body, and a central portion extending toward the top center of the bit body. The through holes comprise a first through hole, a second through hole and a third through hole, the first through hole is arranged on the outer arc part, the second through hole is arranged on the outer side part, and the third through hole is arranged on the central part.

According to one embodiment of the present invention, the first through hole has a larger aperture than the second through hole. And/or the aperture of the first through hole is larger than that of the third through hole. And/or the aperture of the second through hole is larger than that of the third through hole.

According to one embodiment of the invention, the blade has side sections which are located at the sides of the bit body. The through hole further comprises a fourth through hole, and the fourth through hole is formed in the side section.

According to one embodiment of the invention, the side section of the blade is provided with a plurality of fourth through holes, and the fourth through holes are distributed at intervals along a direction parallel to the axial direction of the drill bit body.

According to one embodiment of the present invention, a reservoir solution tank is opened upward at the bottom of the top of the inner cavity of the drill body. Wherein the through hole is communicated with the reservoir solution groove and is communicated with the inner cavity through the reservoir solution groove.

According to one embodiment of the invention, the blade is provided with a plurality of cutting teeth, and the surface of each cutting tooth is inlaid with a plurality of diamond particles. And/or the material of the drill bit body comprises magnesium alloy, and the material of the blade comprises magnesium alloy.

According to another aspect of the invention, a method of drilling a drilling apparatus is provided. Wherein the drilling method of the drilling equipment comprises the following steps:

providing the drill bit proposed by the present invention and described in the above embodiments as a drill bit for a drilling apparatus;

connecting a sleeve to the inner cavity of the bit body;

drilling the drill bit with the casing attached thereto into a predetermined formation level;

injecting a decomposition liquid into the inner cavity through the sleeve, wherein the decomposition liquid flows out of the drill bit through the through hole to decompose the drill bit; and

and (5) cementing the well.

According to the technical scheme, the drilling method of the drill bit and the drilling equipment has the advantages and positive effects that:

the drill bit body of the drill bit provided by the invention is internally provided with an inner cavity, and the inner cavity is opened at the bottom of the drill bit body. The blade of the drill bit is provided with a through hole which penetrates through the two side surfaces and is communicated with the inner cavity of the drill bit body. Accordingly, when the drill bit drills to a preset depth, an operator can convey the decomposition liquid to the inner cavity of the drill bit body through the sleeve and flow out of the through hole in the blade, and therefore the drill bit is decomposed. Moreover, the invention can increase the contact area of the decomposition liquid and the drill bit in the dissolving process by utilizing the through holes so as to accelerate the dissolving speed.

Drawings

Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is a perspective view of a drill bit shown according to an exemplary embodiment; (ii) a

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of portion C of FIG. 1;

FIG. 4 is a top view of the drill bit shown in FIG. 1;

fig. 5 is a sectional view taken along line B-B in fig. 4.

The reference numerals are explained below:

100. a drill bit body;

110. an inner cavity;

111. an internal thread;

120. a reservoir solution tank;

121. a fillet structure;

200. a first blade;

201. an end face;

202. a side surface;

210. a top section;

211. an outer arc portion;

212. an outer side portion;

213. a central portion;

220. a side section;

230. cutting teeth;

300. a second blade;

h1. a first through hole;

h2. a second through hole;

h3. a third through hole;

h4. a fourth via hole;

h5. a first water hole;

h6. a second water hole;

h7. a third water hole;

p. chip removal channel.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are accordingly to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the invention.

Referring to fig. 1, a perspective view of a drill bit according to the present invention is representatively illustrated. In the exemplary embodiment, the drill bit proposed by the present invention is explained by taking a drill bit applied to an oil drilling apparatus as an example. Those skilled in the art will readily appreciate that many modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to utilize the concepts of the present invention in other types of drilling equipment or other equipment, and such changes are within the scope of the principles of the drill bit as set forth herein.

As shown in fig. 1, in the present embodiment, the drill bit of the present invention mainly includes a bit body 100 and blades. The blade has an end surface 201 and two side surfaces 202, the end surface 201 of the blade is arranged at a distance from the bit body 100, and the two side surfaces 202 of the blade are respectively connected between two sides of the end surface 201 and the bit body 100. Referring to fig. 2-5 in combination, fig. 2 representatively illustrates a cross-sectional view taken along line a-a of fig. 1; representatively, an enlarged view of portion C of fig. 1 is shown in fig. 3; representatively illustrated in fig. 4 is a top view of the drill bit; a cross-sectional view taken along line B-B of fig. 4 is representatively illustrated in fig. 5. The structure, connection mode and functional relationship of the main components of the drill bit according to the present invention will be described below with reference to the drawings.

As shown in fig. 1 to 5, in the present embodiment, the drill body 100 has an inner cavity 110 therein, and the inner cavity 110 is open at the bottom of the drill body 100. The blade has a through hole, the through hole penetrates through two side surfaces 202 of the blade, and the through hole is communicated with the inner cavity 110 of the drill body 100. Accordingly, the drill bit of the present invention can be decomposed by a decomposition liquid, and the decomposition liquid flows through the drill bit through the inner cavity 110 of the drill bit body 100 and the through holes of the blades. With the above design, when the drill bit of the present invention drills to a predetermined depth, the operator can transport the decomposition liquid to the inner cavity 110 of the drill bit body 100 through the casing and flow out from the through holes of the blades, thereby decomposing the drill bit. Moreover, the invention can utilize the through holes to increase the contact area of the decomposition liquid and the drill bit in the dissolving process so as to accelerate the dissolving speed.

As shown in fig. 1 to 5, in the present embodiment, the drill is described by taking an example in which the drill includes four blades, the blade distribution is clockwise with the cutting tooth closest to the center line being the first blade, and the four blades are distributed in a substantially cross shape in the radial direction of the drill body 100. In the top view structure of the drill shown in fig. 4, the two first blades 200 are oppositely disposed at the left and right sides of the drill body 100, the two second blades 300 are oppositely disposed at the upper and lower sides of the main body, and the first blades 200 and the second blades 300 have slightly different structures, which are different in that the circumferential distance of the cutting teeth from the central point is different. In other embodiments, the drill according to the present invention may include other numbers of blades, and may include only the first blade 200, only the second blade 300, and other types of blades, all without being limited to the present embodiment.

Preferably, as shown in fig. 1 to 5, in the present embodiment, taking the first blade 200 as an example, the first blade 200 has a top section 210, and the top section 210 is located at the top of the bit body 100. Wherein the middle of the top section 210 of the first blade 200 has an outer arc portion 211, and the outer arc portion 211 is a portion of the top section 210 of the first blade 200 having the greatest distance from the bit body 100. On this basis, a through hole may be preferably opened at the outer arc portion 211 of the top section 210 of the first blade 200, and for distinguishing from other through holes, for ease of understanding and explanation, the through hole opened at the outer arc portion 211 is defined as the first through hole h1 in this specification. With the above design, since the outer arc portion 211 of the top section 210 of the blade is the position where the maximum force is applied in the drill bit and is the main portion where the drill bit enters the ground during drilling, and the first through hole h1 having the largest hole diameter is provided at this position (the relation of the hole diameters of the through holes will be described below), the filtering area of the water flow can be increased during drilling, and the decomposition of the entire structure of the drill bit can be accelerated when injecting the decomposition liquid. In the second blade 300, since the top section of the second blade 300 is shorter than the top section 210 of the first blade 200 in the present embodiment, the first through hole h1 is not formed in the top section of the second blade 300.

Preferably, as shown in fig. 1 to 5, in the present embodiment, a water hole may be preferably formed on the first blade 200. Specifically, one end of the water hole is opened to the end surface 201 of the outer arc portion 211, and the other end is communicated with the inner cavity 110 of the bit body 100. Furthermore, water holes may be preferably formed in the second blade 300, and the number and the positions of the water holes formed in the second blade 300 are substantially the same as those of the water holes formed in the first blade 200. In other embodiments, the number and positions of the water holes formed in the second blade 300 may be different from those of the water holes formed in the first blade 200, and the present embodiment is not limited thereto.

Further, as shown in fig. 1 to 5, based on the design that the outer arc portion 211 of the top section 210 of the first blade 200 is opened with the first through hole h1, and based on the design that the first blade 200 is opened with the water hole, in the present embodiment, the water hole opened on the first blade 200 may preferably include the first water hole h5 (i.e., the main water hole). Wherein the first water hole h5 communicates with the first through hole h1 inside the first blade 200. Furthermore, the second blade 300 is also provided with a first water hole h5 at a position substantially the same as the position of the first water hole h5 provided on the first blade 200, but since the second blade 300 is not provided with the first through hole h1, the first water hole h5 provided on the second blade 300 is directly communicated with the inner cavity 110 of the drill body 100. Through the design, the first through hole h1 is communicated with the first water hole h5, so that the flowing liquid is divided, the drill bit can be kept to drill smoothly in the drilling process, and the drill bit decomposition speed can be accelerated in the decomposition process.

Further, as shown in fig. 1 to 5, based on the design that the water holes opened on the blade include the first water hole h5, in the present embodiment, the water holes opened on the first blade 200 and the second blade 300 may further include the second water hole h6 (i.e., the secondary water hole), respectively. Wherein the second water hole h6 is arranged spaced apart from the first water hole h5, and the second water hole h6 is located at an opposite outer side of the first water hole h5.

Further, as shown in fig. 1 to 5, based on the design of the blade with the water hole, in the present embodiment, the bit body 100 may also preferably have a water hole, and for convenience of understanding and explanation, the water hole opened in the bit body 100 is defined as a third water hole h7 (i.e., a straight water hole) in the present specification. The third water hole h7 may preferably be opened at the top of the bit body 100, and the third water hole h7 is communicated with the inner cavity 110 of the bit body 100. That is, the upper end opening of the third water hole h7 is opened at the top of the bit body 100, and the lower end opening of the third water hole h7 is communicated with the inner cavity 110 of the bit body 100.

Further, as shown in fig. 1 to 5, based on the design that the drill body 100 is provided with the third water hole h7, in the present embodiment, the drill body 100 may further preferably be provided with four third water holes h7, and the four third water holes h7 are respectively located between every two adjacent blades. That is, since the drill bit includes four blades in the present embodiment, and the four blades are disposed on the drill bit body 100 at intervals along the circumferential direction, a cutting passageway P is substantially formed between every two adjacent blades to accelerate the speed of the rock debris returning to the drilling wellhead during the drilling process. On the basis, the third water hole h7 is positioned at the top of the drill bit body 100 corresponding to the position of the chip removal channel P, so that the cleaning effect on the bottom of the well drilling well is further optimized.

Through the design, the drill bit and the decomposition drill bit are cooled by using the water holes as the flow channels of the drilling fluid and the decomposition fluid through the design of the first water hole h5, the second water hole h6 and the third water hole h7.

Preferably, as shown in fig. 1 to 5, based on the design that the first blade 200 has the top section 210, in the present embodiment, the top section 210 of the first blade 200 further has an outer side 212 located at the top periphery of the bit body 100. On this basis, the through hole opened in the first blade 200 may also preferably include a second through hole h2, and the second through hole h2 is opened in the outer side portion 212 of the top section 210 of the first blade 200. That is, the second through hole h2 is located at the opposite outer side of the first through hole h1 in the direction from the center to the periphery of the bit body 100 of the tip section 210 of the first blade 200. Similarly, in the present embodiment, the top section of the second blade 300 also has an outer side portion located at the top peripheral edge of the bit body 100, and the outer side portion of the top section of the second blade 300 is opened with the second through hole h2. Through the design, the second through hole h2 can drill into the in-process and play the effect of mediation rivers and cooling and lubricating, and when pouring into the decomposition liquid into, also can accelerate the decomposition of drill bit overall structure.

Preferably, as shown in fig. 1 to 5, based on the design that the first blade 200 has the top section 210, in the present embodiment, the top section 210 of the first blade 200 further has a central portion 213 extending toward the top center of the bit body 100. That is, the tip section 210 of the first blade 200 has an outer arc portion 211, an outer side portion 212, and a center portion 213 in the present embodiment, the outer arc portion 211 having the largest distance from the bit body 100 than the remaining portion of the tip section 210, the outer side portion 212 being located at the top peripheral edge of the bit body 100, and the center portion 213 extending toward the top center of the bit body 100. On this basis, the through hole opened in the first blade 200 may preferably further include a third through hole h3, and the third through hole h3 is opened in the central portion 213 of the top section 210 of the first blade 200. That is, the third through hole h3, the first through hole h1, and the second through hole h2 are arranged in order in a direction from the center to the periphery of the bit body 100 of the tip section 210 of the first blade 200. In the second blade 300, since the top section of the second blade 300 is shorter than the top section 210 of the first blade 200 in the present embodiment, the third through hole h3 is not formed in the top section of the second blade 300. Through the design, the third through hole h3 can increase the filtering area of the water flow at the 213 th position of the drill bit central part in the drilling process, and can also accelerate the decomposition of the whole structure of the drill bit when injecting the decomposition liquid.

In other embodiments, in the case where the top section 210 of the blade has the outer arc portion 211, the outer portion 212, and the central portion 213, the first through hole h1, the second through hole h2, or the third through hole h3 may not be provided in any of the first blade 200 or the second blade 300. Furthermore, when the top section 210 of the blade is short and does not have the central portion 213 or the central portion 213 and the outer arc portion 211, there is no place to provide the first through hole h1 and the third through hole h3. Even when the blade does not have the tip section 210, the first through hole h1, the second through hole h2, and the third through hole h3 are nowhere provided. It should be borne that the through hole formed on the blade may also be located at other positions of the top section 210, or located at other positions of the blade except the top section 210, which is not limited to this embodiment.

Further, as shown in fig. 1 to 5, based on the design that the first blade 200 is provided with the first through hole h1, the second through hole h2 and the third through hole h3, in the present embodiment, the aperture of the first through hole h1 may be preferably larger than the aperture of the second through hole h2, and the aperture of the second through hole h2 may be preferably larger than the aperture of the third through hole h3. In other embodiments, when the blade is provided with the first through hole h1, the second through hole h2, and the third through hole h3, it is also possible to ensure that the aperture of the first through hole h1 is larger than that of the second through hole h2, or that the aperture of the first through hole h1 is larger than that of the third through hole h3, or that the aperture of the second through hole h2 is larger than that of the third through hole h3, and the present embodiment is not limited thereto.

Preferably, as shown in fig. 1 to 5, in the present embodiment, the blade may also preferably have a side section 220, and the side section 220 is located at the side of the bit body 100. The through hole formed on the blade may preferably include a fourth through hole h4, and the fourth through hole h4 is formed on the side section 220 of the blade. Through the design, the side part of the drill bit body 100 is the gauge protection part of the drill bit, so that the fourth through hole h4 started at the position can disperse heat generated by friction between the drill bit and the wall of a drilling well in the drilling process, can fill the drilling fluid in the drilling process and can accelerate the decomposition of the whole structure of the drill bit in the decomposition process.

Further, as shown in fig. 1 to 5, based on the design that the side section 220 of the blade is provided with the fourth through hole h4, in the present embodiment, the side section 220 of the blade may be preferably provided with four fourth through holes h4, and the four fourth through holes h4 provided on each blade may be preferably spaced apart substantially in a direction parallel to the axial direction of the bit body 100. In other embodiments, the side section 220 of the blade may be provided with other numbers of the fourth through holes h4, such as one, two, three or more than five, which is not limited to the embodiment. In addition, in the present embodiment, the number and the distribution of the fourth through holes h4 formed in the first blade 200 and the second blade 300 are the same, but in other embodiments, the number of the fourth through holes h4 formed in the first blade 200 and the second blade 300 may be different, or the distribution of the fourth through holes h4 formed in the first blade 200 and the second blade 300 may be different. Through the design, when the blade is provided with the fourth through holes h4, the heat generated by the friction between the drill bit and the well wall can be further dispersed, the drilling fluid can be further filled in the fourth through holes h4, and the decomposition of the whole structure of the drill bit can be further accelerated during decomposition.

Preferably, as shown in fig. 5, in the present embodiment, the inner cavity 110 of the drill body 100 may preferably have an inner thread 111 on the cavity wall. Accordingly, the drill body 100 can be connected to a sleeve through the female screw 111. In other embodiments, the drill body 100 may be connected to the casing by other structures or connection methods, and is not limited to this embodiment.

Further, as shown in fig. 5, based on the design that the inner cavity 110 of the bit body 100 is provided with the internal thread 111, in the present embodiment, the internal thread 111 may preferably be a tapered thread.

Preferably, as shown in fig. 2 and 5, in the present embodiment, the interior of the drill body 100 may also be preferably opened with a reservoir solution groove 120. The reservoir solution tank 120 is specifically formed at the top bottom of the inner cavity 110 of the drill bit body 100, and the reservoir solution tank 120 is formed from the top bottom to the top. On this basis, the through hole formed on the blade is connected to the reservoir solution tank 120 and connected to the inner cavity 110 via the reservoir solution tank 120. Through the design, the drilling fluid and the decomposition fluid can be stored in the storage solution tank 120, the dissolving speed of each blade can be further accelerated by communicating the storage solution tank 120 with each through hole, and the dissolving speed of each blade can be synchronized.

Further, as shown in fig. 5, based on the design that the interior of the drill body 100 is opened with the reservoir solution groove 120, in the present embodiment, the notch edge of the reservoir solution groove 120 may be preferably provided with a rounded corner structure 121, such as a rounded corner structure or a beveled surface structure. Through the design, the erosion of the drill bit body 100 caused by water flow can be reduced by utilizing the rounding structure 121.

Further, as shown in fig. 5, based on the design that the interior of the drill body 100 is opened with the reservoir solution groove 120, in the present embodiment, the top and bottom edges of the reservoir solution groove 120 may be preferably provided with a rounded corner structure 121, such as a rounded corner structure or a beveled structure. Through the design, the erosion of the drill bit body 100 caused by water flow can be reduced by utilizing the rounding structure 121.

Preferably, as shown in fig. 1 to 5, in the present embodiment, a plurality of cutting teeth 230 may be preferably provided on the blade. On this basis, the surface of the cutting tooth 230 may be embedded with a plurality of diamond particles, and the diamond particles may be dispersed in the form of small particles after the drill bit is dissolved, and may flow out of the well with the liquid.

Further, based on the design of the cutting tooth 230, in the present embodiment, the surface of the cutting tooth 230 may preferably be provided with a dense number of pores, which can be used for embedding the diamond particles.

Preferably, in the present embodiment, the material of the bit body 100 may preferably include a magnesium alloy, and the material of the blade may preferably include a magnesium alloy. Wherein, the magnesium alloy can adopt high-strength magnesium alloy with special formula. By "special formulation" it is understood that the magnesium content of the magnesium alloy may be adjusted according to the actual need. For example, in the range of 30% to 80% of magnesium, the higher the proportion of magnesium, the faster the dissolution rate.

Through the design, the drill bit provided by the invention can be further convenient for decomposing the drill bit by decomposing liquid on the premise of ensuring the structural hardness and strength required by drilling. When the material of the bit body 100 and the blades includes magnesium alloy, the type of decomposition liquid that can perform a sufficient chemical reaction with the magnesium alloy at the formation temperature may be used, such as potassium chloride and sodium chloride solutions, and the ratio of the solutions may be, for example: dissolution conditions: contains 1-3% potassium chloride or sodium chloride water solution, and the temperature is 0-90 ℃, and the mineralization degree and the temperature of the formation water can also meet the reaction.

Further, based on the design that the material of the bit body 100 includes magnesium alloy, and based on the design of the cutting element 230, in the present embodiment, the cutting element 230 may preferably be configured integrally with the bit, i.e., with the blade, that is, the material of the cutting element 230 also includes magnesium alloy.

It should be noted herein that the drill bits illustrated in the drawings and described in this specification are but a few examples of the wide variety of drill bits that the principles of the present invention can be employed with. It should be clearly understood that the principles of this invention are in no way limited to any of the details of the drill bit or any of the components of the drill bit shown in the drawings or described in this specification.

Based on the above detailed description of exemplary embodiments of the drill bit proposed by the present invention, a drilling method of the drilling apparatus proposed by the present invention will be described below.

In this embodiment, the drilling method of the drilling apparatus provided by the present invention mainly includes the following steps:

providing the drill bit proposed by the present invention and described in detail in the above embodiments as a drill bit of a drilling apparatus;

connecting a sleeve to the inner cavity of the drill bit body;

drilling a drill bit connected with a casing into a preset stratum position;

injecting decomposition liquid into the inner cavity through the sleeve, wherein the decomposition liquid flows out of the drill bit through the through hole to decompose the drill bit; and

and (5) cementing the well.

In summary, due to the adoption of the drill bit provided by the invention, the drilling method of the drilling equipment provided by the invention can put the drill bit and the casing into the well, and after the preset depth is reached, the drill bit is dissolved by injecting the dissolving solution, and the dissolved substance is approximately in a powder shape, so that the subsequent well cementation is not influenced. Therefore, after the drilling of the drill bit is finished and dissolved, the well cementation can be continuously carried out, the re-tripping of the drill bit is not needed, and compared with the existing drilling process, the number of tripping times is reduced, the drilling efficiency is improved, and the drilling period is shortened.

It should be noted herein that the drilling method of the drilling apparatus shown in the drawings and described in the present specification is only a few examples of the many types of drilling methods that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the drilling method of the drilling apparatus or any of the steps shown in the drawings or described in the present specification.

In summary, the drill bit provided by the present invention has an inner cavity inside the drill bit body, and the inner cavity is opened at the bottom of the drill bit body. The blade of the drill bit is provided with a through hole which penetrates through the two side surfaces and is communicated with the inner cavity of the drill bit body. Accordingly, when the drill bit drills to a preset depth, an operator can convey the decomposition liquid to the inner cavity of the drill bit body through the sleeve and flow out of the through hole in the blade, and therefore the drill bit is decomposed. Moreover, the invention can increase the contact area of the decomposition liquid and the drill bit in the dissolving process by utilizing the through holes so as to accelerate the dissolving speed.

Exemplary embodiments of the drill bit and drilling method of the drilling apparatus proposed by the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.

While the drill bit and drilling method of the drilling apparatus of the present invention have been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

Claims (10)

1. A drill bit comprises a drill bit body and a blade, wherein the blade is provided with an end face and two side faces, the end face and the drill bit body are arranged at intervals, and the two side faces are respectively connected between two sides of the end face and the drill bit body; the drill bit is characterized in that an inner cavity is formed in the drill bit body, and the inner cavity is opened at the bottom of the drill bit body; the blade is provided with a through hole which penetrates through the two side surfaces and is communicated with the inner cavity; wherein the drill bit is configured to be decomposed by a decomposition liquid, and the decomposition liquid flows through the drill bit through the inner cavity and the through hole.

2. The bit according to claim 1, wherein the blade has a top section at a top of the bit body; the middle part of the top section is provided with an outer arc part, the distance between the outer arc part and the drill bit body is the largest compared with the rest part of the top section, the through hole comprises a first through hole, and the first through hole is arranged on the outer arc part; and/or the top section is provided with an outer side part positioned on the periphery of the top part of the drill bit body, and the through hole comprises a second through hole which is opened on the outer side part; and/or, the top section has a central portion extending towards a top center of the bit body; wherein the through hole comprises a third through hole, and the third through hole is arranged at the central part.

3. The bit according to claim 2, wherein the blade has a top section at the top of the bit body, the top section having an outer radius in a middle of the top section that is a maximum distance from the bit body relative to the rest of the top section, the through hole comprising a first through hole opening in the outer radius; wherein, the blade is also provided with a water hole, one end of the water hole is opened on the end surface of the outer arc part, and the other end is communicated with the inner cavity; wherein, the first through hole is communicated with the water hole inside the blade.

4. The bit according to claim 1, wherein the blade has a top section at a top of the bit body, the top section having an outer arc that is a greatest distance from the bit body than a remainder of the top section, an outer side at a top periphery of the bit body, and a central portion extending toward a top center of the bit body; the through holes comprise a first through hole, a second through hole and a third through hole, the first through hole is arranged on the outer arc part, the second through hole is arranged on the outer side part, and the third through hole is arranged on the central part.

5. The drill bit of claim 4, wherein the first through hole has a larger aperture than the second through hole; and/or the aperture of the first through hole is larger than that of the third through hole; and/or the aperture of the second through hole is larger than that of the third through hole.

6. The bit according to any one of claims 2 to 5, wherein the blade has side sections located at sides of the bit body; the through hole further comprises a fourth through hole, and the fourth through hole is formed in the side section.

7. The drill bit of claim 6, wherein the side section of the blade defines a plurality of fourth through holes, the fourth through holes being spaced apart along a direction parallel to an axial direction of the bit body.

8. The drill bit according to claim 1, wherein a reservoir solution tank is opened upwards at the bottom of the top of the inner cavity of the drill bit body; wherein the through hole is communicated with the reservoir solution groove and is communicated with the inner cavity through the reservoir solution groove.

9. The drill bit of claim 1, wherein the blade is provided with a plurality of cutting teeth, and the surfaces of the cutting teeth are embedded with a plurality of diamond particles; and/or the material of the drill bit body comprises magnesium alloy, and the material of the blade comprises magnesium alloy.

10. A method of drilling a well bore apparatus, comprising the steps of:

providing a drill bit according to any one of claims 1 to 9 as a drill bit for a drilling apparatus;

connecting a sleeve to the inner cavity of the bit body;

drilling the drill bit with the casing attached thereto into a predetermined formation level;

injecting a decomposition liquid into the inner cavity through the sleeve, wherein the decomposition liquid flows out of the drill bit through the through hole to decompose the drill bit; and

and (5) cementing the well.

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