BG112470A - Continuous drilling vee deflector - Google Patents

Abstract

The invention relates to continuous drilling vee deflector and finds application in geological exploration drilling for the purposes of the geologic studies. The invention includes a composite stator (1) in which is mounted via bearings a composite rotor (2), ending with a rock destroying tool (3). The stator (1) includes an upper and a lower wedge (4 and 5), between which there is a slider (6) with locking elements (8). Above the upper wedge (4) there is a locking channel (10). The rotor (2) includes an upper shaft (11) and a lower shaft (12) connected by a splined coupling (13). In the upper shaft (11) there is an upper bearing assembly (15) and below it a locking pawl (16). Between the locking pawl (16) and the splined coupling (13) there is a lower spring element (20). Between the upper bearing assembly (15) and the upper wedge (4) there is an upper spring element (21). In the upper shaft (11) there is an upper and lower longitudinal opening (22 and 23) ending respectively with an upper and lower transverse opening (24 and 25). Above the splined coupling (13) there is a splined gasket (27). Above the upper bearing assembly (15) there is an upper gasket (28).

Description

CONTINUOUS DRILLING DEVICE WITH CONTINUOUS ACTION

Daughter K. Loomov and Grigor Iv. Topev, Sofia, Bulgaria

FIELD OF THE INVENTION

The invention relates to a continuous action wedge diverter used for targeted exploratory diamond drilling. It is used in geological surveys for accurate drilling of targeted geological exploration wells at great depths in the earth's crust, when it is necessary to reach a specific area and / or target in the ore body or other object of interest.

BACKGROUND OF THE INVENTION

A borehole deflector is known which can control the direction of geological boreholes [author's certificate BG 27473]. It includes a stator in which a rotor is mounted with a removable core receiving tube. The rotor includes an upper and a lower shaft connected by a splined joint. The upper shaft ends with an adapter for connection to a drilling tool, and a rock-breaking tool is connected to the lower shaft. On the rotor are formed two bearing units - upper and lower, around the upper and lower support rings, and under the upper there is a tooth.

The stator includes an upper and lower wedge, connected by channels and slots with a slider located between them, on the front side of which rollers are mounted. There is an upper spring between the upper bearing assembly and the upper wedge, and a lower spring between the thumb and the splined joint. On the inside, the upper wedge has a protrusion with a channel into which a tooth enters.

The disadvantage of this diverter is that there is a risk of loss of orientation and deviation from the desired trajectory of the borehole, as the operator has no information whether the diverter is brought into working position, ie. whether the rotor is released from the stator. The transmission of rotational motion to the rotor before it is released can lead to mechanical damage and / or an accident with the drilling tool. The stated shortcomings lead to the need to repeat unsuccessful diversion operations, increase unproductive time and risk of accidents, which reduces the efficiency of drilling.

TECHNICAL ESSENCE

It is an object of the present invention to provide a directional drilling diverter that is easy to operate and maintain, does not require additional drilling equipment, provides accurate and reliable drilling guidance at large drilling depths, and allows rapid and efficient drilling diversion. in the desired direction.

The problem is solved by creating a continuous wedge diverter, including a composite stator, in which a composite rotor is mounted with a suitable rock-breaking tool attached in its lower part.

The stator consists of an upper wedge and a lower wedge, between which there is a slider with a front, on which fixing elements are attached. At the upper inner end of the upper wedge there is a board with a locking channel formed in it.

The rotor consists of a solid upper shaft and a hollow lower shaft with upper and lower support rings formed in them, connected by a splined connection. Around the upper support ring is an upper bearing assembly, under which there is a locking pin. The upper end of the upper shaft ends with an adapter for connection to a drilling tool equipped with an orientator. A rock-breaking tool is attached to the lower end of the lower shaft.

The continuous action wedge diverter further comprises a lower spring element located between the locking pin and the slotted joint and an upper spring element located between the upper bearing assembly and the upper wedge.

The upper shaft is solid, with upper and lower longitudinal holes formed in it, ending with upper and lower transverse holes for the passage of the washing liquid through it, respectively. A nozzle is located in the lower longitudinal hole. At the upper end of the slot connection there is a slot seal, and above the upper bearing assembly there is an upper seal.

The continuous action wedge diverter may include a spring housing that completely encloses the upper spring element. The spring housing is located between the upper seal and the upper wedge and is connected to them in a known manner.

The continuous action wedge diverter may also include a wedge housing that encloses the slider and is located between the upper wedge and the lower wedge. An opening is formed in the wedge body, located centrally opposite the front of the slider.

The lower and upper spring elements can be helical force springs. The fixing elements can be made as rollers and be freely attached to the front of the slider. The rollers can be conical. The fixing elements can also be designed as metal plates, preferably carbide, carbide weld or other suitable way.

The slotted seal may include a "0" - ring, grease / Teflon gasket or the sealing effect can be achieved in another known manner.

The nozzle can be replaced.

An advantage of the continuous action wedge diverter according to the invention is that there is a signaling allowing the operator to establish that he is in working position and can start drilling. This achieves more precise drilling and can be drilled at great depths. It is easy to operate, reliable and does not require additional drilling equipment.

With its use the drilling time is reduced, as there is no need to perform additional lowering and lifting operations and deviations to adjust the trajectory of the drilling. This makes the continuous action wedge diverter according to the invention more efficient than the known solution.

The inclusion of a spring housing around the upper spring prevents the danger of particles falling from the borehole falling between the elements of the upper spring, which reduces the force with which the upper wedge presses the slider, and hence the lateral force acting on the mud tool.

The inclusion of a wedge housing prevents the danger of jamming and blocking of the slider with rock particles. This helps to increase the accuracy of the deviation. In addition, the spring and wedge housing prevent unwanted lateral bending of the diverter, which also increases the accuracy of the drilling trajectory control process.

DESCRIPTION OF THE ATTACHED FIGURES

FIG. 1 is a side view of a drill wedge deflector is a continuous operation in the non-operating position;

FIG. 2 is a schematic longitudinal section of a drill wedge diverter with continuous operation in the non-operating position.

FIG. 3 is a side view of the lower part of a drill wedge deflector with continuous operation in working position;

FIG. 4 is a cross-section along AA of Figure 2;

FIG. 5 is a cross-section along BB of Figure 2.

FIG. 6. Enlarged image of part C of figure 2.

EXAMPLE PERFORMANCE

Figures 1 to 6 show a preferred embodiment of a continuous action wedge deflector according to the invention. In Figure 1, the continuous action wedge diverter is shown in a non-operating position in the well 33. It includes a composite stator 1 in which a composite rotor 2 is mounted, to the lower part of which a suitable rock-breaking tool 3 is connected.

The stator 1 consists of an upper wedge 4 and a lower wedge 5, between which is a slider 6 with a front 7. To the front 7 there are freely attached conical rollers 8. At the upper end inside the upper wedge 4 there is a board 9 in which a locking channel 10 (explained in Figures 2 and 4).

The rotor 2 consists of a solid upper shaft 11 and a hollow lower shaft 12 connected by a splined joint 13. An upper support ring 14 is formed at the upper end of the upper shaft 11 with an upper axial bearing assembly 15 located around it, and a locking device is provided below it. finger 16.

The upper end of the upper shaft 11 ends with an adapter 17 for connection to a drilling tool equipped with an orientation device (not shown in the figure). A lower support ring 18 is formed in the lower shaft 12, around which a lower bearing assembly 19 is located.

Between the locking pin 16 and the slotted joint 13 there is a lower helical spring element 20, and between the upper axial bearing assembly 15 and the upper end of the upper wedge 4 there is an upper helical spring element 21,

Upper and lower longitudinal holes 22 and 23 are formed in the upper shaft 11, ending with upper and lower transverse holes 24 and 25, respectively (explained in Figure 6). A replaceable nozzle 26 is located in the lower longitudinal hole 23 of the upper shaft 11. At the upper end of the slotted joint 13 there is a slotted seal 27 with an O-ring 32. Above the upper axial bearing assembly 15 there is an upper seal 28 (shown in Figure 2).

The continuous action wedge diverter further comprises a spring housing 29, completely enclosing the upper spring element 21. The spring housing 29 is located between the upper seal 28 and the upper wedge 4 and is connected to them.

The continuous action wedge deflector also includes a wedge housing up to which comprises a slider located between the upper wedge 4 and the lower wedge 5. A window 31 is formed in the wedge housing 30 which corresponds in size to the front 7 of the slider located centrally against the front 7. (clarified in Figure 5).

APPLICATION OF THE INVENTION

The operation of the continuous action wedge diverter according to the invention is described in detail below with reference to Figures 1 to 6.

The continuously drilled wedge deflector is assembled on the surface so that the locking pin 16 is locked in the locking channel 10 (shown in Fig. 5), which prevents rotation of the rotor relative to the stator. The fixing of the rotor 2 to the stator 1 allows the drilling wedge deflector to be oriented along the insertion angle, which is the basis for controlling the drilling trajectory. The complete drill diverter with continuous action is lowered into the borehole.

When it reaches just above the borehole face, it is oriented by known means of orientation. Circulation of flushing fluid then begins and the continuously drilled wedge diverter, which is secured against rolling, is lowered until the rock-breaking tool 3 steps on the face. The flushing fluid passes successively through the upper longitudinal orifice 22, the upper transverse orifice 24, the lower transverse orifice 25, the lower longitudinal orifice 23, and then passes through the nozzle 26, which controls the circulating pressure.

As the axle load increases, the upper shaft 11 causes the upper spring 21 to compress, which exerts pressure on the upper wedge 4. Under the action of the spring force F1 thus applied (shown in Figure 3), the upper wedge 4 presses and pushes / pushes the slider 6 sideways. to the walls of the borehole 33 with force F2, the front of which 7 protrudes through the window 31 formed in the wedge housing 30.

Under the action of the force F2 in the slider 6, the edges of the fixing rollers 8 penetrate into the walls of the borehole 33, securing the stator 1 against rotation, allowing its longitudinal movement.

Under the action of the applied axial load, the upper shaft 11 of the rotor 2 moves downwards at a distance equal to the stroke h of the slotted joint 13, whereby the locking pin 16 exits the locking channel 10 _? formed in the board 9 of the upper wedge 4 and unlocks the rotor 2. The lower and upper transverse holes 25 and 24, which connect the lower and upper longitudinal holes 23 and

22, pass sequentially through the slotted seal 27, as a result of which the flow of washing liquid passing through them is restricted (shown in Fig. 6). This causes a temporary increase in the circulating pressure of the flushing fluid, which is read on the surface by a pressure gauge (not shown). This is an indication to the operator that the continuous wedge deflector is set to the operating position and the required axle load and torque can be applied.

As a result of the lateral force F2 created under the action of the slider 6 during drilling, a lateral force F3 occurs in the rock-breaking tool 3. Since the stator 1 is provided against rotation, the lateral force F3 has a constant direction, in which the drilling continues along a curve which is part of a circle of a certain radius, in the plane of orientation. At the end of the directional drilling cycle, the rotation is interrupted, the flushing fluid circulation is stopped and the axial load is removed. Under the action of forces exerted by the lower and upper springs 20 and 21, the upper shaft 11 moves upwards at a distance equal to the stroke h of the splined joint 13, whereby the upper wedge 4 and the lower wedge 5 move apart and the slider 6 retracts into starting position. In this position, the continuously drilled wedge deflector is removed from the borehole.

In core drilling, the principle of operation is the same, as the rock-breaking tool 3 is a core core, complete with a known construction of a core receiving tube. The core formed during drilling is collected in the core receiving tube and then removed to the surface.

Claims (5)

PATENT CLAIMS A continuous action wedge deflector, comprising a composite stator (1) in which a composite rotor (2) is mounted with a rock-breaking tool (3) attached in its lower part, the stator (1) being composed of an upper wedge (4) and a lower wedge (5), between which is a slider (6) with a front (7), on which are fixed fixing elements (8), and at the upper end of the upper wedge (4) is formed a board (9) in which has a locking channel (10), and the rotor (2) consists of an upper shaft (11) and a lower shaft (12), with shaped upper (14) and lower (18) support rings connected by a splined connection (13), as in the upper shaft (11) an upper axial bearing assembly (15) is formed, and below it there is a locking pin (16), whereby the upper shaft (11) ends with an adapter (17) for connection to an orientation device, as in the lower shaft ( 12) a lower bearing assembly (19) is formed and a rock-breaking tool (3) is connected below it, wherein the continuously wedge wedge diverter also includes a lower spring element (20) located between the locking pin (16) and the slotted joint (13), and an upper spring element (21) located between the upper axial bearing assembly (15) and the upper wedge (4), characterized in that in the upper shaft (11) is solid and has shaped upper and lower longitudinal holes (22) and (23), ending with upper and lower transverse holes (24) and (25), respectively, and at the lower end of the lower longitudinal hole (23) is a nozzle (26) is located, and at the upper end of the slot connection (13) there is a slot seal (27), the drill wedge diverter also including an upper seal (28) located above the upper axial bearing assembly (15). Continuous action wedge deflector according to claim 1, characterized in that it comprises a spring housing (29) comprising the upper spring element (21) and located between the upper seal (28) and the upper wedge (4). Continuous wedge deflector according to Claim 1, characterized in that it comprises a wedge housing (30) comprising the slider (6) and located between the upper wedge (4) and the lower wedge (5), as in the wedge housing (30) is formed a window (31) located opposite the front (7) of the slider (6). Continuous-acting wedge deflector according to Claims 1 to 3, characterized in that the fixing elements (8) are freely suspended conical rollers. Continuously drilled wedge deflector according to Claims 1 to 4, characterized in that the fixing elements (8) are carbide inserts.