The downhole device for education aimed cracks

 

(57) Abstract:

The invention relates to mining and can be used for crack formation in the wells with the aim of separating blocks from arrays, extraction of valuable crystalline raw materials and building stone. The device includes a tube, sequentially installed on the end-of-pipe sealer from an elastic material and the spacer ring, the system pressure of the fluid in the pipe, the node rotation of the pipe relative to the sealer. At the end of the tube is tapered thread, and spacer ring sharpened on the outer circumference, is made with a slot and end holes, into which are inserted rods and formed with a pipe coil pair. The invention provides improved efficiency and reliability in operation. 3 C.p. f-crystals, 4 Il.

The invention relates to mining and can be used for crack formation in the wells with the aim of separating blocks from arrays, extraction of valuable crystalline raw materials and building stone.

A device for the formation of directed fractures in wells ABT. mon. 1573171, CL E 21 C 37/06, E 21 In 43/26, publ. in BI 23, 90, including full working fluid body in the form of glass calzaroni on the body, with the possibility of longitudinal movement, annular sealants trapezoidal cross-section, coaxially mounted on the housing between the thrust collar and screw-down ring to form between them an annular gap triangular cross-section with the base adjacent to the radial holes, the node of longitudinal movement of the adjusting ring in the form of coaxially with the housing and related pipe thread swivel handle, node a pressure of the working fluid in the housing in coaxial and opposed to the bottom of the casing of the piston rod and additional swivel arm, disc springs with radial slots in the periphery coaxially mounted on forming a circular slot surfaces of annular sealants, and the tubular sleeve, covers the body at the level of the location of the pressure ring with the adjacent annular sealer and located between the pipe end and the nearest to her Belleville spring, while on the outer surface of the case is made annular ledge to rest on his inner edge of the disc springs from the side of the thrust collar.

This device has a relatively complicated construction. It is not intended for the formation of cracks in solid rocks.

Most aimed crack by AVT. mon. The USSR 1714123, CL E 21 37/04, publ. in BI 7, 92, comprising two interconnected thread with the possibility of longitudinal movement of one relative to the other coaxial pipe with ring lugs on one-sided ends. At the end of the inner tube under the focus ring of the outer pipe has been consistently found to ring sealer and spacer ring of elastic material. The device contains a system pressure of fluid in the inner pipe and the node rotation of one pipe relative to another. This spacer ring is made from interconnected by means of a spring sectors with recesses on the inner surfaces forming a tapered annular groove. The annular stop of the inner tube is made in the form of a socket that is installed in the annular groove.

This device has a relatively complex structure, its use implies the existence of initiating cracks (without gearing for initiating slit device under the action of high pressure fluid is ejected from the well). The combination of these shortcomings leads to a relatively low efficiency of the device.

The technical problem solved by the invention is to improve the any strength without cutting initiating cracks and simplify the design.

The task is solved in that the downhole device to education aimed cracks, including pipe, sequentially installed on the end-of-pipe sealer from an elastic material and the spacer ring, the system pressure of the fluid in the pipe, the node rotation of the pipe relative to the sealer, according to the proposed technical solution at the end of the tube is tapered thread, and spacer ring sharpened on the outer circumference, is made with a slot and end holes, into which are inserted rods and formed with a pipe coil pair.

The combination of pipe with tapered threads at one end and forming with the tube screw a couple of sharpened on the outer circumference of the spacer ring with the slot and the end holes, into which are inserted rods, eliminates the need for initiating cracks. This is because the spacer ring on the line of contact with the rock concentrates voltage and thereby replaces initiating a crack. In addition, spacer ring, udaliaias in the walls of the well, prevents ejection of the device from the well under the pressure of the pumped fluid.

Thus, the combination of the mentioned signs /P> Appropriate slot in the spacer ring to perform at an angle to the axis of the device. This slot does not form a gap in the spacer ring when it is opening. It provides full coverage of the borehole between its walls and the pipe, which improves the sealing.

Suitable terminals at the free ends to sharpen. Pointed ends of the rods, getting into the cavities of rocks, creating greater resistance to sliding along the surface of the well bottom. This allows you to hold the spacer ring against rotation when screwing in his pipe.

Suitable rods to insert into the end of the sealer. This keeps the tubing from rotation when screwing in his pipe.

The essence of the technical solution is illustrated by the example of a specific implementation and drawings.

In Fig. 1 shows a downhole device for the formation of oriented cracks in the initial state, a longitudinal section; Fig.2 - the same at the moment of crack formation, longitudinal section; Fig.3 - spacer ring, side view; Fig.4 - spacer ring, type in the plan.

The downhole device for the formation of oriented cracks (Fig.1, 2) consists of a tube (housing) 1, one side of which is made of konekesko the 4 are radial holes 5, in which are inserted the arm 6, and a Central hole with a thread 7, which is screwed the screw 8 with the handle 9. At the end of the pipe 1 from the side of the conical thread 2 has been consistently found to sealing sleeve 10 and the spacer ring 11, which is sharpened on the outer circumference and forms with the pipe 1 screw pair. In the spacer ring 11 is made through the end openings 12 (Fig. 4), through which are passed rods 13, which penetrate into the end of the sealing sleeve 10. The outer ends of the rods 13 is pointed and threaded washer 14 of non-Newtonian fluid (plastic mass). The device is lodged in the hole 15 drilled in a rock mass 16, which created the crack 17 (Fig.2). In the spacer ring 11 made the slot 18 (Fig.3 and 4) at an angle to the axis of the device.

The parameters of the spacer ring 11 are set of conditions that you can move the device through the borehole 15 in the direction of the face, creating the desired stress concentration along the line of contact of the pointed part with rock at the moment of crack initiation 17 and retaining device from popping out of the well bore 15 by the pressure of injection of non-Newtonian fluid. The slot 18 (Fig.3 and 4) perform so that the adjacent sections of the spacer CoE wells 15, as the gap between its walls and the pipe 1 is blocked not only the sealing sleeve 10, but completely (without a gap) spacer ring 11.

The sealing sleeve 10 is made of polyurethane or other equivalent elastic material. On its inner surface under the action of penetrating the conical thread 2 is formed corresponding to the spiral groove. Radial sliding sealing sleeve 10 is performed by screwing the pipe 1.

The dimensions of the protruding ends of the rods 13 are set of conditions that you can move the pipe 1 in the direction of the bottom hole 15 to the maximum separation of the spacer ring 11. The rods 13 are implementing at the end of the sealing tube 10 to prevent its rotation relative to the spacer ring 11 when screwing the pipe 1.

Washer 14 reduces the amount of non-Newtonian fluid, which should apply from the tube 1 to fill the sealed zone of the well 15 to crack formation 17.

Conditions of use of the device include the use of non-Newtonian fluid is a special fluid with great resistance to movement on the crack 17. However, crest. If you use plain liquid (water), it is through facing surface crack 17 will be free to leak out. This pressure fluid will drop dramatically and the process of breaking rocks will stop. You need to create such conditions that there was a penetrating effect of the wedge, when, despite the presence of the front space, the fracture surface 17 when applying it non-Newtonian fluid was coming apart. These conditions are ensured by the use of plastic masses, in particular of modeling clay. Plastic mass type of clay, as shown by experiments, not forced through the coil pair at sufficient pressure to fracture rocks of any strength. Therefore, in the pipe 1 install the piston is not necessary, which greatly simplifies the manufacture of the device.

The operation of the device is as follows.

The device fill non-Newtonian fluid and the rod 13 serves in the hole 15 to lock the shaft. Using arm 6, rotate the pipe 1 and thereby screw it on sealing sleeve 10 and the spacer ring 11. When this spacer ring 11 trying to get into the borehole wall 15 (in some cases implemented), and the most normal punctures and wells 15 and the sealing sleeve 10 is sealed, and along the line of contact of the spacer ring 11 with the borehole wall 15 focus voltage. Then by rotating the handle 9 of the screw 8 is screwed into the pipe 1. Screw 8 supersedes of non-Newtonian fluid from the device in a sealed space of the borehole 15 and creates a pressure, which is between the bottom hole 15 and the spacer ring 11 arise tensile forces, which are concentrated along the line of contact of the spacer ring 11 with a rock. When reaching the tensile forces tensile strength of rocks stretching the crack 17 (Fig.2). In the crack 17 flows of non-Newtonian fluid and develops it. Crack growth 17 continues up until it pump non-Newtonian fluid. Creating a crack 17 of the desired size, stop the rotation of the screw 9. Using the arms 6 of the pipe 1 vivencial of the sealing sleeve 10 and the spacer ring 11 until such time as they, due to the elasticity, will not reduce its diameter to a value that provides the ability to move the device through the borehole 15. The device is then removed from the bore 15.

The device can be used in the production of crystalline raw block of stone; the construction of tunnels and roads in mountainous terrain; disassembly with energy, ease of operation, efficiency and reliability.

1. The downhole device for education aimed cracks, including pipe, sequentially installed on the end-of-pipe sealer from an elastic material and the spacer ring, the system pressure of the fluid in the pipe, the node rotation of the pipe relative to the sealer, characterized in that at the end of the tube is tapered thread, and spacer ring sharpened on the outer circumference, is made with a slot and end holes, into which are inserted rods and formed with a pipe coil pair.

2. The device under item 1, characterized in that the slot in the spacer ring is made at an angle to the axis of the device.

3. The device under item 1, characterized in that the rod at the free end is pointed.

4. The device under item 1, characterized in that the cores are inserted into the end of the sealer.

 

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