The v-diverter

 

(57) Abstract:

The invention relates to techniques for drilling, in particular to a device for cutting a "window" in a casing. The invention consists in that the element node supports the whipstock is made in the form of a solid piston held in the case of node support in the initial position of the shear pin, while the inclined surface of the element node supports are made in the form of protrusions corresponding to the grooves of the spacer elements (dice), and in the lower part of the wedge is closed cavity associated with the high pressure hose through the side holes in the guiding wedge, while the working surface of the wedge has the form of a trough, which is made from the upper die, and housing support node additionally has a radial hole to provide relief of fluid pressure in the chamber formed by moving a solid piston relative to the wedge, which is a measure of the fixing wedge whipstock at the required level in the borehole, and a radial hole is located from the upper end of the piston at a distance defined by a mathematical relationship. The invention improves the reliability of the installation and fixates to a device for cutting a "window" in a casing.

It can be used for drilling oil and gas wells, drilling and mounting of the shafts in the construction of multilateral wells and the drilling of additional wells.

Art

A device for directional drilling, which controls the trajectory of the borehole during the drilling process without lifting the drilling tool [1].

The device includes a downhole motor with a whipstock, the fixing unit of the whipstock. The fixing unit of the whipstock is made in the form of rigidly connected with the outer surface of the housing of the downhole motor upper and lower bearing rings and bushings. The diverter is located between the support rings. Sleeve installed between the latter with the possibility of axial movement. The housing of the downhole motor is between the rings of the radial hole. The sleeve is provided with seals. The distance between the upper support ring and the whipstock less, and the distance between the whipstock and the lower support ring to the height of the sleeve. In the process of drilling the bushing is in its extreme upper position. Precision slant holes are provided through the use of a deflecting element with a hydraulic drive create deflecting efforts. of the fixing unit is installed in two extreme positions, limited upper and lower support rings by opening or closing the diverter, which determines the ability to control the trajectory of the well.

Before turning on the mud pump portarray tool rises with the sleeve in contact with the wall, is moved in the housing of the downhole motor to the lower support ring, releasing the whipstock. After turning mud pump due to the pressure drop occurring at the bit, the diverter extends from the housing of the downhole motor and interacting with the wall of the wells, creates a deflecting force on the forming tool. In this position, the radial hole is open, part of the washing liquid passes through the hole and thus reduces the total fluid pressure. To reduce the pressure by a certain amount, you can judge the position of the whipstock "curvature". When closed, the hole is created constant pressure, which characterizes the operation of the diverter in the "direct" position, and the sleeve acts as a stabilizer.

The drawbacks are: the unreliable operation of the fixing unit due to the presence of support rings, which are experiencing a lot of pressure sleeve may be in the role of "shear Bo is willnig pipes. While mechanically install the sleeve in the lower position. Then served washing fluid, which puts the whipstock and sets it in the well wall. But at the same time open the hole and water dilutes the borehole wall above the whipstock, not providing a reliable engagement of the whipstock from the well wall, compromising the quality of drilling bits and more on kickoff "window" in a casing. The location of the radial holes on the bushing and diverter creates an unfavorable condition for the operation of the bushing as the bushing is in contact with the hole wall, and the water from the hole, down down, creates the danger of erosion of the entire wall and skewed structures under unplanned angle. Before turning on the mud pump must rock cutting tool to lift, which is associated with additional effort.

Known whipstock [2], comprising a housing with an axial cylindrical channel, the piston and the fixing unit. The fixing unit is made in the form prescribed in the channel of the sleeve with a radial hole, and located in the cavity of the sleeve piston and retainer installed in the hole. There is a rod containing an inclined groove in the side of the piston. The latch raspologen served washing fluid. The piston moves down, and the latch is shifted to the axis of the device, while the diverter is released.

The drawbacks are: the complexity of the preparatory period for lowering the device into the well. By pressing on the piston, which is fixed on the rod, move the piston and rod in the lower position, the latch is moved to the body axis, settles in the sleeve. After that, put the standoff in the housing until it stops. Shoot the efforts of the piston. When this rod under the action of the spring moves up, pushing the latch, which in turn enters the opening in the whipstock. Only after that the device is ready to descend into the well.

The orientation of the whipstock carry out difficult and due to the presence of the piston cloves, position and set the position of the whipstock, making shooting jagged protrusions. The device is associated with a multi-operational efforts of mechanical actions, and hydraulics involved in the separation device designed for whipstock and detach the device from the whipstock, feeding into the cavity of the drill pipe and the washing liquid, after the whipstock in position. The process of separating the second liquid, but this framing of the action may negate the initial complex manipulation of the setting of the whipstock, as the reduction of fluid pressure in this case is more indicative of the achievement of separation, after which the rest of the fluid can damage the walls of the well at the whipstock and to give the whipstock another position in the well.

Known whipstock downhole motor [3], consisting of the installed one above the other of the upper and lower sections connected by a bearing, the axis of which is inclined at equal angles to the axes of the sections made in the cavity of the upper section of the body cylinder, the axis of which coincides with the axis of the bearing mounted in the cylinder for axial movement by a spring-loaded piston with a hollow stem. To simplify the design it has to be rigidly connected with the lower section of the casing and mounted one below the other of the upper and lower locking elements, each of which is made in the form located on diametrically opposite sides of the projections, and the piston rod has diametrically spaced projections for alternate engagement with the upper and lower locking elements respectively in the upper and lower Pol">

The drawbacks are: the inapplicability it when using the wedge in diverter for cutting Windows in the casing, and when used in Klenova the whipstock of this scheme hydraulics complicated technically and technologically, the use of design because of its mnogoplemennosti and additional costs for "growing" device partitions, where would be the wedge. Moreover, the scheme of the fluid on the piston and output it into the hole under the piston does not allow you to adjust the depth of insertion of the wedge into the body of the whipstock and, therefore, does not provide information about the completion of the installation of the wedge to a predetermined depth in the casing string.

It is known device [4] for drilling and cutting a "window" in a casing. The diverter includes a guide wedge with the working surface in the form of a gutter, the associated shear elements drain wedge, site support, comprising a housing with a through axial channel, with retractable spacer elements in the form of dice, which is connected to the housing of the diverter (cover) with two shear bolts. The die is made of cylindrical shape, are on the upper side of the teeth, which they cut into the wall of the casing and with the inner side - no dice-side inclined plane made grooves, and on the inclined planes of the body - the appropriate tabs. The grooves and the protrusions have the shape of a dovetail and serve to hold the blocks on inclined planes of the body, not allowing the dice to deviate and to advocate for the dimensions of the whipstock, and come into engagement with the walls of the casing ahead of time during the descent of the whipstock in the well. The guide wedge is rigidly connected with the body containing a through axial channel. To facilitate the descent of the whipstock in the well and injection of cement mortar setting the whipstock has a through channel.

As a prototype of the selected device [5], the closest to the technical essence and the positive effect of the present invention. The device includes a guide wedge, cutter with a device for feeding liquid to the wedge shear bolt connecting the cutter with the wedge, the node connecting wedge anchor packer and anchor the packer, a through hole for fluid flowing in the guiding wedge and anchor the packer. The guide wedge has a front surface on which further moves the cutter. Unit anchor packer includes a cylindrical core with a hole passing through the tube, is directly linked to the weight of the upper end of the casing. The cylinder has a through passage in the center and its upper end connected with a pipe, on the end of which there is a valve. The lower part of the guide wedge is connected with the packer Assembly rigidly annular sleeve, a bolt and a coupling screwed on the lower end of the guide wedge. The sleeve is fixed by the bolt. The lower end of the core includes an outer ledge, which is a support for the anchoring of the packer. Anchor packer includes dice, placed round over the ledge, which together with wedges increases the adhesion of the dice in the wall of the casing and the core. Wedges fixed shear bolts. The upper die is located under the movable coupling, which provides a consolidation of the core in the hole and which is fixed shear bolt. Inside the casing there is a piston that slides along the wall of the casing, and a piston in the form of a rod, which moves the sliding plate under the piston within the casing. The piston inside the housing further under the action of fluid drops on the plate inside the tube, the plate moves the clutch down, and the unit as a whole anchor packer is fixed in a given direction.

The drawbacks are:

- lack of reliability what's bolts in wedges and bolts connecting the wedges with the core, the coupling core and wedge cutter because of the possibility of an unplanned disconnection of the parts bolted;

- anchor packer is a complex interlinked multi-element system, therefore there is the complexity and high cost of production unit, and in case of failure or delay in the actuation of any of numerous elements of the unit fails, the entire unit;

hydraulic component of the whipstock is largely dependent on the quality of the rubber part of the packer, which must be sound and capable of withstanding high fluid pressure for a long time, from the valve, which should block the fluid from the reverse it after removing the cutter from the guide wedge. The failure of any element of the unit will result in loss of efficiency of the whipstock in General. Hydraulics significantly complicated;

- dice located in the lower and upper parts of the node supports, placed round and provide a pinning site support and guide wedge axis without deviation, wedges also contribute to the consolidation of the dice without rejecting the node supports attributes which is along the axis of the whipstock, forming a gap between the borehole wall and the lower part of the wedge and, accordingly, the upper part of the wedge loosely adjacent to the borehole wall than poor drilling conditions.

The aim of the present invention is to eliminate these disadvantages.

The invention

The technical problem is achieved by the fact that the V-diverter comprising, as known to guide the wedge with the working surface, site support, including retractable spacer elements in the form of upper and lower dies with the teeth on the front surface and the inclined surfaces on the back side of the dies, the node supports, the body of which is rigidly connected with the guide wedge having at the side opposite the working surface, a groove for placing the last of the high pressure hose, the element node supports at the top and bottom parts which are inclined surfaces for engagement with the dies, along the axis of the whipstock has a cavity associated with the high pressure hose, gaskets placed between the support node and the piston, the upper part of the wedge screw-mounted outboard device, different from the known fact that the element node supports are made in the form of a solid piston held in the building is Olney in the form of protrusions, corresponding to the grooves of the dies, and in the lower part of the wedge is a cavity, which is closed and connected with the high pressure hose through the side holes in the guiding wedge, while the working surface of the wedge has the form of a trough, which is made from the upper die, and the body of the node supports additionally has a radial hole to provide relief of fluid pressure in the chamber formed by moving a solid piston relative to the wedge, which is a measure of the fixing wedge whipstock at the required level in the borehole, and a radial hole is located from the upper end of the piston down at the distance S, depending on the progress of the plates in the transverse axis of the whipstock direction h and the angle of the protrusion on the surface of the piston defined by the formula S = h/tg .

Causality

Unlike the prototype, the invention held in place by two shear pins, not five, which ensures reliable operation for setting the whipstock at a given level in the well, eliminating nezaplanirovanno detach the guide wedge from the piston. Unlike the prototype of the whipstock contains one piston and solid, allowing the panel is support in the form of a solid cylinder with a beveled, inclined surfaces on the one side, and on the other hand at the bottom of the whipstock is set after fixing plates in the walls of the borehole with tilt, pressing firmly to the walls of the upper and lower parts of the guide wedge.

In the prototype by placing dice in the radial direction is not ensured tight clamp the upper part of the guide wedge.

Housing support node additionally has a radial hole, and a guide wedge has a closed cavity, connected side hole with high pressure hose. Unlike the prototype of the diverter made of the guide wedge and a solid piston, completely and with high reliability, the task of the hydraulic component of the diverter is in the presence of radial openings in the housing and the fluid supplied through the wedge under pressure the piston moves along the borehole wall until, until you reach the hole. When this occurs, the pressure fluid that is recorded by the device, the piston stops, roots dies at a given level in the well. Mnogoplemennosti prototype replaced with a simplified design that can improve the reliability of the whipstock, to reduce the cost of the e and do not need the node supports to hold during fixing in the well under the constant pressure of the liquid, the goal is solved is to improve the reliability of the whipstock while simplifying design and due to the hydraulic component, which made a soft landing on culling and level fixing wedge diverter calculated and depends on the outcome of dice in the transverse axis of the whipstock direction h and the angle of the protrusion on the surface of the piston depends on the location of the radial holes in the support body. Thus in the present invention hydraulics applies not to fill the anchor packer fluid and hold it under pressure, and to create a positive pressure in the closed cavity of the lower part of the wedge, which in turn, influences the piston drives the piston down until the moment when the radial hole in the body of the node supports. Reaching the location of the holes in the housing, the piston enters the required technological level for the installation of the diverter wedge. So the hole is placed in the enclosure at a level equal to S = h/tg , where h depends on the given geometrical parameters of the components of the unit support and the geometry of the casing, and the angle is taken from 1 to 30ofor obespechenie force on the piston reaches the level in which there is loss of integrity of the system. Within = 1-30othere is a dependence with decreasing angle decreases the hydraulic force on the piston, and the density of blocks in the wall of the column is the same.

In other previously known inventions hydraulic part is also structurally complicated, the result is less reliable than the present invention. [2] as the release position of the piston has a protrusion in the shaft, which is located in a radial hole of the sleeve under the piston, but not the hydraulic force, and the mechanical actions implement the installation of the diverter at the bottom, despite the presence of the piston and the radial bore and an axial cylindrical channel in the body of the whipstock. Hydraulic component in a known invention is intended for separation device for whipstock from the whipstock through the water in the through channel of the device. The complicated impact of the piston rod, a spring on the sleeve, in which the radial hole to lock the position of the piston rod in the housing of the device. Thus known [2] the technical solution does not provide a target that is reached proposed by the invention.

In izvestnova reference part V of the whipstock and the strength of the engagement of the whipstock to the borehole wall, as efforts to regulate the water pressure on the whipstock.

In the present invention the orientation of the kickoff of the "window" in the wall of the borehole depends on the angle of inclination of the surface of the gutter on the front surface in deflecting part of the wedge. The performance of hydraulic component by filing through the hose located in the groove on the back of the wedge of fluid through a closed cavity in the lower part of the wedge radically simplifies and increases the reliability of the device. That is, the objective technical problem has been fully achieved.

The invention is illustrated by drawings: Fig. 1 - V-diverter in longitudinal section before descending wedge in the hole, Fig. 2 - position V whipstock in the well after installation.

The device operates as follows.

The layout of the diverter wedge 1, 2, 3 down into the hole on the bottom (Fig. 1). Include a pump (not shown) and serves fluid in the hose 11 high pressure. The hose 11 is located in the groove 10 of the upper part of the wedge, the water flows in a closed cavity 13 in the lower part of the wedge 12 and presses the piston 2. When reaching a certain level of water pressure is cut stud 16, the retaining temporarily Porsche reaches a level, where there are cross-cutting radial hole 18 in the housing 3 of node support. After the opening of the piston 2 holes 18, a sudden release of pressure fluid, as the fluid (water) flows into this hole from the chamber 22 (Fig. 2). The reading of the pressure gauge (not shown) it is obvious that the V-diverter set in working position (Fig. 2). When the piston 2 is sliding plates 4' and 4" on inclined surfaces 7, 8 of the piston 2 and offset them in the radial direction (Fig. 2). The die is firmly fixed in the wall of the bore when the piston 2 reaches the lowest point, i.e. a given level on the bottom. Due to the presence of two placed on opposite sides of the dies 4 and 4" (one of the bottom 4', the other top 4, and the groove of the wedge 9 is executed by the upper die 4," provided the most dense planting whipstock and the upper part of the wedge to the walls of the well, regardless of the direction of the teeth 5 on the surface. Increases the density and orientation of the wedge and the presence of a continuous rolling piston 2, is made in the form of a cylinder. The wedge is pressed against the wall of the well casing at the side opposite the surface of the trench 9 (Fig. 2). Then cut the hose 11, unload a string of pipe, cutting off the bolt 20 (Fig. 1), connect down, preserue wall trim columns. In the proposed device, wedge, prop (case of node support, the piston is made of steel In 7 (GOST 1435-90). The relief of the surface of the die is screw threaded. Shear stud 16 and the bolt 20 is made of steel, selected on the basis of the efforts of the slice. The groove, the grooves of the hose and die performed by milling. A closed cavity is also performed by milling. The guide wedge conventionally consists of an upper part with a groove 9 on one surface and a groove 10 on the other and the lower part 12, and in General, the wedge is made continuous. In the lower part of the wedge milled closed cavity 13 (in contrast to the prototype) and with a hole 15 for high pressure hose 11. Deflecting the lower part of the wedge 12 and the housing 3 node supports are connected by a threaded and welding; in the lower end surface of the wedge has a tapered connection of steel In 7, and the lower part of the wedge 12 through tapered thread 14 is included in the piston 2 and is held temporarily shear pin 16 along the axis of the whipstock. The seal 17 is made in the form, for example, rubber o-rings or other sealing material and inserted into grooves (not shown) in the housing of the piston 2.

The present invention industrially made. There is a prototype, tested in AK slaughter, improving the reliability of anchoring in the wall of the well site support and wedge in the upper part, simplifying the design, reducing the stress-strain state of the device during installation and operation; clear lock level whipstock downhole without additional funds and time tracking; with the exception of unplanned actuation of site support during descent to the specified level on the bottom.

Compared with the prototype, the invention has the advantages:

device warrants unplanned wedging during installation because of the minimum number of shear bolts and lack of mnogoplemennosti site support;

- installation of the diverter wedge and strong binding site support is provided to more securely and efficiently due to the presence of the wedge closed cavity in which an excessive pressure of the fluid driving the piston, which is the element node supports, which in turn together with the dies firmly fixed in the borehole at a given level. The level of fixation of the piston and the whipstock generally in the borehole is determined by the formula S = h/tg , i.e. the distance by which to move the piston is a system of elements, representing a host of support in the prototype, the piston is made of solid, only increased the efficiency of the whipstock;

- hydraulics is not constant, but intermittent, and more reliably and efficiently than in the prototype;

- increases the strength of the fit of the upper part of the wedge to the borehole wall due to the position of the upper die from the front surface of the guide wedge. Thus, moving on the inclined surfaces of the piston, die shift the position of the piston relative to the axis of the whipstock; the lower die moves to the right, the upper die moves the piston to the left, thereby install guide wedge angle of deflection of the piston. The upper part of the wedge is pushed to the borehole wall from the back side, and the lower portion is deflected to the right wall and tightly secured, increasing the reliability of the cutter.

Sources of information

1. A. S. N 1716068, MKI E 21 In 7/08 from 05.10.89, (analog).

2. A. S. N 1564319, MKI E 21 In 7/08 from 26.07.88, (analog).

3. A. S. N 1640327, MKI E 21 In 7/08 from 02.01.89, (analog).

4. A. S. N 1059112, MKI E 21 In 7/08 from 29.03.82, (analog).

5. U.S. patent N 4397355 from 09.08.83, (prototype).

The V-diverter, including healthy lifestyles is th dice with teeth on the front surface and the inclined surfaces on the back side of the dies, the site supports a housing which is rigidly connected with the guide wedge having side opposite the working surface a groove for placing the last of the high pressure hose, the element node supports at the top and bottom parts which are inclined surfaces for engagement with the dies, along the axis of the whipstock has a cavity associated with the high pressure hose, gaskets placed between the support node and the piston, the upper part of the wedge screw-mounted outboard device, characterized in that the element node supports are made in the form of a solid piston held in the case of node support in the initial position of the shear pin, when the inclined surface of the element node supports are made in the form of protrusions corresponding to the grooves of the dies, and in the lower part of the wedge is a cavity, which is closed and connected with the high pressure hose through the side holes in the guiding wedge, while the working surface of the wedge has the form of a trough, which is made from the upper die, and the body of the node supports additionally has a radial hole to provide relief of fluid pressure in the chamber formed by moving a solid piston otnosityelnoi hole is from the top end of the piston down at the distance S, depending on the progress of the plates in the transverse axis of the whipstock direction h and the angle of the protrusion on the surface of the piston defined by the formula S = h/tg.

 

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4 dwg, 1 ex

FIELD: oil and gas production industry, particularly multilateral well construction.

SUBSTANCE: method involves lowering pipe string provided with diverter at end thereof; cutting casing pipe within predetermined interval; lowering flexible pipe with nozzle until flexible pipe enters into opened casing pipe zone under the action of the diverter in alternation with supplying pressurized liquid via flexible pipe provided with nozzle; performing translational flexible pipe movement to create additional well bores having necessary lengths along with removing the flexible pipe to create predetermined number of additional bores. Before casing pipe lowering in the well the casing pipe is provided with acid-soluble insert arranged opposite to formation to be opened. Casing pipe cutting is performed around the full perimeter thereof for necessary length within predetermined opening interval by solving the acid-soluble insert during acid supplying through pipe string into above predetermined interval. After that the diverter having several diverting channel is installed in the interval. After each additional well bore forming flexible string with nozzle is removed only from the pipe string and diverter to create predetermined number of additional bores. After that the flexible pipe with nozzle is finally removed from the casing pipe.

EFFECT: reduced number of trips.

2 dwg

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