CN216043535U - Composite diamond expanding bit - Google Patents

Abstract

The utility model discloses a combined type diamond reamer bit, belongs to the field of diamond reamer bits, and provides a combined type diamond reamer bit for solving the problems of low reaming efficiency and long consumed time. The utility model can realize reaming and drilling for the wall with larger thickness at one time, thereby greatly reducing the repeated reaming times and reducing the reaming workload and the reaming time.

Description

Composite diamond expanding bit

Technical Field

The utility model relates to the field of diamond reamer bits, in particular to a composite diamond reamer bit.

Background

The hydroelectric engineering drilling field is mainly divided into overburden drilling and bedrock drilling according to stratum conditions, compared with the fields of geological and mining, metallurgy, industrial and civil construction and the like, the main focus of the hydroelectric engineering exploration is on rock core taking conditions and in-hole tests, so that the requirement on the rock core taking rate of a drill hole is high, the rock core taking rate of a overburden section at least reaches 85%, and the rock core taking rate of a bedrock section at least reaches 90%; and in the drilling operation process, a plurality of tests are needed to be matched in the hole, and the tests mainly comprise a standard penetration test, a water pressing test, a ground stress test, a ground temperature test and the like.

Overburden drilling is always used as a serious difficulty of hydroelectric engineering drilling, particularly deep overburden drilling (which means drilling holes with overburden depth larger than 300 m), the stability of the overburden hole wall is poor, the hole forming is difficult, and the best method for protecting the stability of the hole wall is to isolate the overburden section by adopting a follow-up casing mode, so that the hole wall is prevented from collapsing. Because the strong friction force of the wall of the covering layer on the side wall of the casing and the resistance of the bottom of the casing cause that the follow-up depth of the casing of each diameter is very limited, a plurality of diameter casings are required to be adopted for wall protection for drilling the ultra-deep covering layer.

The core drilling tool for the drilling operation of the hydroelectric engineering generally adopts a diameter phi 94mm, and after the core drilling operation is completed, a sleeve with a corresponding diameter is placed into the bottom of a hole in a hole expanding mode. In order to ensure that the sleeves with different diameters follow up smoothly, the sleeves with the corresponding diameters are put into the drilled holes after the holes are reamed. During reaming operation, if a large-diameter reaming bit (such as phi 168mm) is directly adopted for reaming operation after drilling operation coring, the thickness of a covering layer of about 37mm (calculated as (168mm-94mm)/2) is still left around the hole wall after coring, so that the drilling tool is difficult to follow, the follow-up depth is limited, and the core in the hole is difficult to take out. Therefore, in the reaming operation, a multi-caliber reaming tool is adopted, and the reaming is performed sequentially from small to large so as to ensure the reaming effect. However, the following disadvantages still exist when a multi-caliber hole expanding drill is adopted to sequentially perform hole expanding operation: after the hole is expanded by each caliber expanding drilling tool, the drilling tool and the drill rod are lifted off the ground, and then the corresponding large-caliber drilling tool is replaced to continue the expanding operation. Along with the continuous increase of the drilling depth, the drilling time and the tripping time of each drilling cycle are increased, so that the reaming efficiency is gradually reduced, and the reaming time is longer.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a composite diamond reaming bit for solving the problems of low reaming efficiency and long time consumption.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the combined type diamond reamer bit comprises at least two layers of diamond reamer bits which are sequentially sleeved and matched from inside to outside and have gradually increased calibers, wherein each layer of diamond reamer bit comprises a bit body, a hollow flushing fluid channel is arranged inside the bit body, a bit screw thread is arranged at the upper end of the bit body, a plurality of tire bodies are distributed at intervals in the circumferential direction at the bottom end of the bit body, a water passing port is reserved between every two adjacent tire bodies, and a diamond cutter body is embedded on each bit tire body; the diamond reamer bit positioned on the outer layer in the two adjacent layers of diamond reamer bits is sleeved outside the diamond reamer bit positioned on the inner layer through a flushing fluid channel of the diamond reamer bit, the matrix of the diamond reamer bit on the outer layer is connected with the matrix of the diamond reamer bit on the inner layer through a lower welding body in a welding mode, and one end of a drill bit screw thread of the diamond reamer bit on the outer layer is connected with one end of a drill bit screw thread of the diamond reamer bit on the inner layer through an upper welding body in a welding mode.

Further, the method comprises the following steps: the number of the tire bodies on each layer of diamond expanding drill bit is equal, and the tire bodies are uniformly distributed at intervals in the circumferential direction of the bottom end of the diamond expanding drill bit; and the matrix on the diamond expanding drill bit of two adjacent layers is aligned along the radial direction of the drill bit.

Further, the method comprises the following steps: the diamond reamer bit of adjacent two-layer is reserved gappedly after cup jointing the cooperation, goes up the welding body and is provided with a plurality ofly respectively with the lower welding body to each lower welding body sets up along drill bit circumference interval, and each upper welding body sets up along drill bit circumference interval.

Further, the method comprises the following steps: the diamond reamer bit is provided with three layers, and the calibers of the three layers of diamond reamer bits from inside to outside are as follows: phi 114mm, phi 127mm and phi 146 mm.

Further, the method comprises the following steps: the bottom ends of the diamond reamer bits are flush.

The utility model has the beneficial effects that: the utility model adopts two or more than two drills with different calibers to carry out sleeve joint compounding, thereby combining a large-section combined diamond expanding drill; the reaming drilling machine can drill the reaming of the wall thickness with larger thickness at one time, further can greatly reduce the repeated reaming times, reduce the reaming workload and the reaming time, and simultaneously can also reduce the material consumption, the labor consumption and the drilling cost on site. In addition, gaps are reserved after the diamond expanding drill bits of the two adjacent layers are sleeved and matched, so that a better water passing channel is provided for expanding drilling through the corresponding gaps between the diamond expanding drill bits of the two adjacent layers, and the blocking condition of a drill bit water channel can be effectively reduced.

Drawings

FIG. 1 is a cross-sectional view of a composite diamond reamer bit according to the present invention;

FIG. 2 is a bottom view of a composite diamond reamer bit according to the present invention;

labeled as: the drill bit comprises a drill bit body 1, a flushing liquid channel 2, a drill bit screw thread 3, a tire body 4, a water gap 5, a lower welding body 6, an upper welding body 7 and a gap 8.

Detailed Description

The utility model is further described with reference to the following figures and detailed description.

It should be noted that, if there are directional indication terms, such as the terms of direction and orientation, above, below, left, right, front and back, in the present invention, for facilitating the description of the relative positional relationship between the components, the absolute position that is not the positional relationship between the related components and the components is specifically referred to, and is only used for explaining the relative positional relationship and the motion situation between the components in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly. When the present invention relates to a number, such as "a plurality", "several", etc., two or more than two are specifically referred to.

As shown in fig. 1 and fig. 2, the composite diamond reamer bit of the present invention comprises at least two layers of diamond reamer bits which are sequentially sleeved and matched from inside to outside and have gradually increased calibers, each layer of diamond reamer bit comprises a bit body 1, a hollow flushing fluid channel 2 is arranged inside the bit body 1, a bit screw thread 3 is arranged at the upper end of the bit body 1, a plurality of matrix bodies 4 are arranged at intervals in the circumferential direction of the bottom end of the bit body 1, a water passing opening 5 is reserved between the adjacent matrix bodies 4, and a diamond cutter body is embedded in each bit matrix body 4; the diamond reamer bit positioned on the outer layer in the two adjacent layers of diamond reamer bits is sleeved outside the diamond reamer bit positioned on the inner layer through the flushing fluid channel 2, the matrix 4 of the diamond reamer bit on the outer layer is connected with the matrix 4 of the diamond reamer bit on the inner layer through the lower welding body 6 in a welding mode, and one end of the drill bit screw thread 3 of the diamond reamer bit on the outer layer is connected with one end of the drill bit screw thread 3 of the diamond reamer bit on the inner layer through the upper welding body 7 in a welding mode.

Without loss of generality, the present invention provides no structural improvement to single layer diamond reamer bits, and thus each layer of diamond reamer bits is actually a conventional diamond reamer bit structure. In addition, the combined diamond reaming bit only needs to connect the bit screw thread 3 of the diamond reaming bit at the outermost layer with the corresponding drill rod.

In the utility model, the composite diamond reamer bit product with two or more composite layers is formed by sleeving and matching diamond reamer bits with different calibers; and after the sleeve joint, the lower welding body 6, the lower welding body 7 and other fixed connection structures are formed by welding at corresponding positions, so that the integral structural strength of the drill bit product after the combination is ensured.

More specifically, in order to facilitate welding, it is preferable in the present invention that the number of the tire casings 4 on each layer of the diamond reamer bit is equal, and the tire casings 4 are uniformly distributed at intervals in the circumferential direction of the bottom end of the diamond reamer bit; and the matrix 4 on the diamond reamer bit of two adjacent layers is aligned along the radial direction of the bit. In the structure shown in fig. 2, the number of the tire bodies 4 on each layer of diamond reamer bit is 11, and the tire bodies are uniformly distributed along the circumferential direction of the bit; when the sleeve joint is arranged, the tire bodies 4 on the diamond expanding drill bits of all layers are aligned along the radial direction, so that the welding operation of the lower welding bodies 6 between the adjacent diamond expanding drill bits can be facilitated. The advantage of this arrangement also can make the water gap 5 of each layer of diamond reamer bit align correspondingly in the radial direction of the bit, so as to form better water passing effect.

More specifically, in order to avoid the situation of blocking of the drill bit water channel, gaps 8 can be further reserved after the diamond reamer bits of two adjacent layers are in sleeved fit, meanwhile, a plurality of upper welding bodies 7 and a plurality of lower welding bodies 6 are arranged respectively, the lower welding bodies 6 are arranged at intervals along the circumferential direction of the drill bit, and the upper welding bodies 7 are arranged at intervals along the circumferential direction of the drill bit. Thus, the flushing liquid drained from the drill rod can flow through the flushing liquid channel 2 in the diamond expanding drill bit at the innermost layer, and can also flow through the gap 8 between the diamond expanding drill bits at the adjacent layers, so as to flush the end face of the whole drill bit.

More specifically, the utility model can specifically set the diamond reamer bit to have three layers, for example, the calibers of the diamond reamer bit from inside to outside of the three layers can be set as follows: phi 114mm, phi 127mm and phi 146 mm.

More specifically, the bottom ends of the diamond reamer bits are generally arranged to be flush with each other, so that the bottom end of the finally formed composite diamond reamer bit and the diamond cutter body thereon are smooth, and drilling operation is facilitated.

Claims (5)

1. Combined type diamond reamer bit, its characterized in that: the diamond reamer comprises at least two layers of diamond reamer bits which are sequentially sleeved and matched from inside to outside and have gradually increased calibers, wherein each layer of diamond reamer bit comprises a bit body (1), a hollow flushing fluid channel (2) is arranged inside the bit body (1), a bit screw thread (3) is arranged at the upper end of the bit body (1), a plurality of tire bodies (4) are arranged at intervals in the circumferential direction of the bottom end of the bit body (1), water passing ports (5) are reserved between the adjacent tire bodies (4), and a diamond cutter body is embedded in each bit tire body (4); the outer diamond reamer bit that lies in adjacent two-layer diamond reamer bit overlaps outside the diamond reamer bit that lies in the inlayer through its flush fluid passageway (2) to between matrix (4) of outer diamond reamer bit and matrix (4) of the diamond reamer bit of inlayer through welding body (6) welded connection down, drill bit screw thread (3) one end of outer diamond reamer bit and drill bit screw thread (3) one end of the diamond reamer bit of inlayer are through last welding body (7) welded connection.

2. The composite diamond reamer bit of claim 1, wherein: the number of the tire bodies (4) on each layer of diamond reamer bit is equal, and the tire bodies (4) are uniformly distributed at intervals in the circumferential direction of the bottom end of the diamond reamer bit; and the tire bodies (4) on the diamond reamer bits of two adjacent layers are aligned along the radial direction of the bit.

3. The composite diamond reamer bit of claim 1, wherein: a gap (8) is reserved after the two adjacent layers of diamond reamer bits are sleeved and matched, the upper welding body (7) and the lower welding body (6) are respectively provided with a plurality of welding bodies, the lower welding bodies (6) are arranged along the circumferential direction of the drill bit at intervals, and the upper welding bodies (7) are arranged along the circumferential direction of the drill bit at intervals.

4. The composite diamond reamer bit of claim 1, wherein: the diamond reamer bit is provided with three layers, and the calibers of the three layers of diamond reamer bits from inside to outside are as follows: phi 114mm, phi 127mm and phi 146 mm.

5. The composite diamond reamer bit of any one of claims 1 to 4, wherein: the bottom ends of the diamond reamer bits are flush.

Images