CN205382876U - Broken rock device in eccentric two rank - Google Patents

Abstract

The utility model designs an eccentric double-stage rock-breaking device, which mainly includes an outer casing, a volumetric power assembly, a transmission shaft, a lower joint and a first-stage drill bit; wherein: the outer shell also includes a connection with the second-stage drill bit; the lower joint is located at the second Inside the first-order drill bit; the central axis of the volumetric power assembly and transmission shaft coincides with the central axis of the first-order drill bit, the outer shell coincides with the central axis of the second-order drill bit, and the central axis of the first-order drill bit does not coincide with the central axis of the second-order drill bit. The device is installed between the bottom hole assembly and the drill bit, which can not only provide high speed and high torque for the drill bit to break rock, but also drill a stepped hole, reducing the difficulty of rock breaking with a drill bit of a specified size, compared with conventional single-stage rock breaking The method can effectively improve the rock crushing efficiency and reduce the overall cost of drilling; it can make the first-stage drill bit rotate and revolve at the same time, which completely solves the problem of insufficient rock-breaking energy at the low centerline speed of the conventional single-stage drill bit, and can obtain greater cutting volume. It can also make the drilling tool assembly more stable, which is beneficial to control the quality of the borehole.

Description

Eccentric double-stage rock breaking device

technical field

The utility model relates to the field of drilling tools in the field of oil and gas drilling and coal bed gas drilling, in particular to an eccentric double-stage rock breaking device.

Background technique

With the increase of oil and gas drilling depth, the rock formation is harder and harder to break, which seriously affects the increase of ROP. The reduction of ROP has become a technical bottleneck restricting the efficient development of deep oil and gas reservoirs in my country, and the existing conventional rock-breaking drilling technology cannot meet the requirements. Process requirements for speed and efficiency. PDC bits have advantages over other bits and are widely used, but the drilling speed of large-sized wells is slow, the bit wears seriously in highly abrasive formations, the price of large-size or high-performance bits is expensive, and the centerline speed of the bit is low. Rock breaking energy is insufficient , is also the main problem faced by the PDC drill bit. New drilling technologies such as laser drilling, thermal drilling, and particle impact drilling cannot be applied on-site.

Utility model content

The purpose of the utility model is to solve the problems existing in the prior art and provide an eccentric double-stage rock-breaking device with simple structure, reliable performance, high control precision and convenient operation for oil and gas drilling, coal bed gas drilling, geological exploration and mine drilling. , in order to further improve the rock-breaking ability of hard rock and highly abrasive rock, and greatly increase the ROP of the designed wellbore.

The technical scheme that the utility model solves its technical problem adopts is:

The eccentric double-stage rock breaking device mainly includes the outer casing 1, the volumetric power assembly 2, the transmission shaft 5, the lower joint 7 and the first-stage drill bit 8; the upper part of the transmission shaft 5 is processed with the bypass hole 4, and the lower part of the transmission shaft 5 is connected with the lower joint 7 connection, the volumetric power assembly 2, the bypass hole 4, and the transmission shaft 5 are all installed inside the outer shell 1, the lower joint 7 is located at the lower part of the outer shell, and the lower joint 7 is connected with the first-order drill bit 8, which is characterized in that: it also includes The second-stage drill bit 9; the outer shell 1 is connected to the second-stage drill bit 9; the lower joint 7 is located inside the second-stage drill bit 9; It coincides with the central axis 12 of the second-order drill 9, and the central axis 13 of the first-order drill does not coincide with the central axis 12 of the second-order drill.

The above programs further include:

A shaft coupling 3 is installed between the volumetric power assembly 2 and the transmission shaft 5 , and a stabilizer 6 is provided outside the outer casing 1 .

The stabilizer 6 is a helical stabilizer or a straight edge stabilizer or a roller stabilizer.

The bottom surface of the first-stage drill bit 8 protrudes from the bottom surface of the second-stage drill bit 9 .

The eccentric double-stage rock-breaking device of the utility model not only has the improved drilling speed of the double-stage rock-breaking device with concentric structure, but also solves the problem that the center line speed of the first-stage drill bit is small and limits the rock-breaking efficiency of the first-stage drill bit; The advantages of existing technical equipment break the monopoly of foreign technology, give full play to the technical advantages of the two-stage drilling process, increase the drilling speed, reduce the overall cost of drilling, shorten the construction cycle, and meet the technological requirements for efficient development and drilling of deep oil and gas reservoirs. The technology can effectively reduce the rock-breaking difficulty of the drill bit used in the designed borehole, and further improve the efficiency of drilling and breaking rock. At the same time, the eccentric double-stage rock-breaking device also has the characteristics of simple structure design, reliable performance and convenient operation.

Field practice has proved that using the eccentric double-stage rock-breaking device to drill wells can increase the drilling efficiency by 56.7% on average, save the drilling cycle by 5-8 days, and the drilling quality meets the design standards, achieving the purpose of low energy consumption and high efficiency drilling.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the eccentric double-stage rock-breaking device proposed according to the utility model.

Fig. 2 is a schematic diagram of the combination of the first-stage drill bit and the second-stage drill bit of the eccentric double-stage rock breaking device proposed according to the utility model.

Fig. 3 is a schematic diagram of the movement trajectory of the first-stage drill bit and the second-stage drill bit in the borehole in the eccentric double-stage rock-breaking device proposed according to the utility model.

In the figure 1-outer shell, 2-volume powertrain, 3-coupling, 4-bypass hole, 5-transmission shaft, 6-stabilizer, 7-lower joint, 8-first-order drill, 9- Second-order drill, 10-first-order drill trajectory, 11-second-order drill trajectory, 12-second-order drill central axis, 13-first-order drill central axis.

detailed description

Describe the utility model in detail below in conjunction with accompanying drawing.

Referring to Figure 1, the eccentric double-stage rock breaking device mainly includes an outer casing 1, a volumetric power assembly 2, a transmission shaft 5, a lower joint 7 and a first-stage drill bit 8; the upper part of the transmission shaft 5 is processed with a bypass hole 4, and the transmission shaft 5 The lower part is connected with the lower joint 7, the volumetric power assembly 2, the bypass hole 4, and the transmission shaft 5 are all installed inside the outer shell 1, the lower joint 7 is located at the lower part of the outer shell, and the lower joint 7 is connected with the first-order drill bit 8, the difference It is characterized in that: it also includes a second-stage drill bit 9; the outer shell 1 is connected to the second-stage drill bit 9; the lower joint 7 is located inside the second-stage drill bit 9; the volumetric power assembly 2, the central axis of the transmission shaft 5 and the central axis 13 of the first-stage drill bit Coincidentally, the outer casing 1 coincides with the central axis 12 of the second-order drill bit 9, and the central axis 13 of the first-order drill bit and the central axis 12 of the second-order drill bit do not coincide.

The foregoing embodiments further include:

A shaft coupling 3 is installed between the volumetric power assembly 2 and the transmission shaft 5 , and a stabilizer 6 is provided outside the outer casing 1 .

The stabilizer 6 is a helical stabilizer or a straight edge stabilizer or a roller stabilizer.

The bottom surface of the first-stage drill bit 8 protrudes from the bottom surface of the second-stage drill bit 9 .

Working mechanism and effect of the present utility model:

When drilling and breaking rock, when the drilling fluid enters the eccentric two-stage rock breaking device, the drilling fluid drives the volumetric power assembly to start rotating, drives the transmission shaft to rotate through the coupling, and then drives the lower joint to rotate, and the lower joint to drive the first-stage drill bit The self-rotating rock breaking starts, and the drilling fluid passes through the volumetric power assembly, enters the inside of the drive shaft through the bypass hole, and then reaches the bottom of the well through the first-stage drill bit; at the same time, the rotational torque of the ground rotary table is transmitted to the eccentric two-stage rock breaking device through the drill string The outer casing reaches the second-stage drill bit, which drives the second-stage drill bit to rotate and break rock. While the first-stage drill bit rotates around its own central axis to break rock, it also rotates around the central axis of the second-stage drill bit with the rotation of the second-stage drill bit, thus producing two states of rotation and revolution. The central axis of the first stage is an eccentric structure, so that the high linear velocity area of the first stage drill bit passes through the low linear velocity area of the drill bit center, which overcomes the low rock breaking efficiency of the conventional drill bit due to the low center line velocity. The eccentric double-stage rock-breaking device controls the rotation form and combination of the two-stage drill bits, which can not only drill the stepped well bottom, but also facilitate the fast and efficient drilling of the designed wellbore, and solve the problem of the low rock-breaking efficiency of the conventional drill bit center line speed. low problem, and the quality of the drilled hole is better, and the stability of the drill string is stronger. It is suitable for the technical requirements of various types of drill bits (roller cone bits, PDC bits). Compared with conventional rock breaking technology, it has the same energy consumption and Under the conditions of the drilling cycle, more rocks can be cut, that is, the drilling speed is faster and the rock breaking efficiency is higher, and its economic benefits are very significant.

Claims (4)

1. the broken rock device in eccentric double; two rank, master includes shell body (1), positive displacement power assembly (2), power transmission shaft (5), lower contact (7) and single order drill bit (8)；Wherein, power transmission shaft (5) top processing by-pass prot (4), power transmission shaft (5) bottom is connected with lower contact (7), positive displacement power assembly (2), by-pass prot (4), power transmission shaft (5) are installed in shell body (1) inside, lower contact (7) is positioned at shell body bottom, lower contact (7) is connected with single order drill bit (8), it is characterised in that: also include second order drill bit (9)；Shell body (1) is connected with second order drill bit (9)；It is internal that lower contact (7) is positioned at second order drill bit (9)；Positive displacement power assembly (2), power transmission shaft (5) central shaft overlap with single order bit central axle (13), shell body (1) overlaps with second order drill bit (9) central shaft (12), and single order bit central axle (13) and second order bit central axle (12) are misaligned.

2. the broken rock device in the double; two rank of bias according to claim 1, is characterized in that: install shaft coupling (3) between positive displacement power assembly (2) and power transmission shaft (5), be provided externally with regulator (6) at shell body (1).

3. the broken rock device in the double; two rank of bias according to claim 2, is characterized in that: regulator (6) are spiral stabilizer or the one of straightedge type regulator, idler wheel stabilizer.

4., according to claim 1 or 2, the broken rock device in eccentric double; two rank described in 3, it is characterized in that: single order drill bit (8) bottom surface protrudes from second order drill bit (9) bottom surface.