SU1728464A1 - Device for borehole deflection - Google Patents

Abstract

The invention relates to a drilling technique. The goal is to increase the reliability of the device in operation. The device includes a column pipe (QD) 1, a deflection assembly with fixation means, an actuator and a guide rod 7, and a hydraulic position indicator of the latter. The CT 1 on the inner surface has an annular shoulder 2. The drive is made in the form of an airbag 11 with a communication node with a guide rod 7. The communication center includes overshot 12, coupling 13, p 14, ball 15 and cover 16. Hydraulic position indicator the guide rod 7 is made in the form of radial holes 17 and 18 in the uthel 11. The latter are hydraulically connected to the axial channel 19. The apertures 17 and 18 are located under the annular collar 2 QT 1 in the initial position of the pilot rod 7. Upper part of the yellow 11 has grooves 20. After installing the guide rod 7, a flushing fluid is pumped into the working position in the cavity of the drill pipe. Then CT 1 is moved down. In this case, the annular 6vDT 2 closes the channel formed by the CT 1 and the separator 11. After the annular collar 2 is moved below the radial holes 17, the washing liquid flows freely to the bottom. By rotating CT 1, the well is drilled in a new direction. At the same time, the precursor 11 rotates with the CT 1. 3 Il. (Ls

Description

The invention relates to a drilling technique and can be used in wiring directional wells with projectiles with a removable core receiver.

A device for changing the direction of a well bore is known, comprising a column pipe with an annular collar on the inner surface and a deflection assembly located in the cavity of the column pipe with locking means, an actuator, and a guide rod. At the same time, the fixation means is made in the form of a spring-loaded bracket, which forms a wedge with the surface of the guide rod, and the drive - in the form of an eccentric load-orientator 1.

A disadvantage of the known device is low reliability in operation. This is due to two reasons. First, the lack of information on the deviation of the guide rod and its fixation in the wellbore. Secondly, due to the lack of force of gravity of the eccentric load to reliably loosen the locking means in the wellbore. In connection with this

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during the work, the reliability of the curvature cycle in the required direction is not guaranteed.

Closest to the proposed technical entity is a device for changing the direction of the well bore, comprising a core pipe with an annular collar on the inner surface, a deflection assembly located in the cavity of the core pipe with fixing means, a drive and a guide rod, and a hydraulic indicator of the position of the guide rod. In this case, the fixation means is made in the form of a rigid metal bracket that interacts with the core column, the drive is in the form of a mechanism rigidly connected with the upper part of the guide rod, which ensures that the flow of the washing liquid is blocked by elastically deformed sealants and the hydraulic indicator of the position of the guide rod - as installed in the axial channel of the actuator valve 2.

This device also has insufficient reliability in operation, due to the following reasons. In the known device, the hydraulic indicator provides only control of the deflection of the guide rod and does not allow control of the reliability of releasing the locking means in the wellbore. In addition, the entire curvature of the well is accompanied by an additional increase in pressure of the flushing fluid necessary to deflect the guide rod from the axis of the well. Since the drilling of deep wells is characterized by an already high pressure of flushing fluid, close to the maximum allowable, the magnitude of the additional pressure drop is significantly limited. This reduces the reliability of the fixing means of fixation in the wellbore. The disadvantages of the known device should also include the rather complex design of the device for shutting off the free flow of the washing liquid with elastically deformable seal centralizers, which also reduces its reliability during operation. The hydraulic load created by the loading mechanism is of a static nature and does not ensure reliable fixing of the fixing unit in the wellbore. As a result, the reliability of the device in operation, consisting in the guaranteed curvature of the well in the design direction, is reduced,

The aim of the invention is to increase the reliability of the device in operation.

The goal is achieved by the fact that in a known device for changing the direction of a well bore, including a core tube with an annular collar on the inner surface, a deflection assembly with fixation means, an actuator and a guiding rod, and a hydraulic indicator of the position of the guide rod, located in the cavity of the core pipe, the drive is designed as a junction box with a communication unit for the guide rod, and a hydraulic position indicator

5 of the guide rod - in the form of upper and lower radial holes made in the uthel, hydraulically connected by an axial channel and located below the annular shoulder of the core pipe in the initial position of the guide rod.

Performing the drive in the form of the ut gel allows, by freely descending it, to strike a deflection assembly and

5, this increases the reliability of the fixation of the fixation means in the wellbore under the action of a shock load. By providing the coupling unit with a coupling unit for the guide rod, firstly, an automatic coupling of the coupling rod with the guide rod for their subsequent joint extraction to the surface and, secondly, the transfer of the shock load from the supply rod to the guide rod is provided.

Performing a hydraulic indicator of the position of the guide rod in the form of upper and lower radial holes made in the utj, hydraulically connected by the axial channel and located under the annular collar of the core tube in the initial position of the guide rod

5 signal in the form of increasing and decreasing pressure of the washing liquid during longitudinal displacements of the core tube relative to the deflection assembly and thus controlling the process of releasing

0 means of fixation in the wellbore.

Thus, during the operation of the proposed device, by using a shock load and obtaining control hydraulic signals on the surface, the fixing means are secured in the wellbore and, therefore, the well is curved in the design direction. Known technical solutions, including a set of features similar to

a set of features that distinguish the proposed technical solution from the prototype, not detected.

FIG. 1 shows a device for changing the direction of a borehole at the bottom of the well, a longitudinal section; FIG. 2 - the same after releasing the locking means; fig.Z - the same in the process of curvature.

The device for changing the direction of the well bore includes a column pipe 1 with an annular collar 2 on the inner surface and a crown 3. In the cavity of the core pipe there is a deflection assembly including a removable diverter with a drive. The removable diverter includes locking means made in the form of wedges 4 and 5 connected by shear elements b, a guide rod 7 protected outside by a freely rotating safety tube 8, and a drilling hinge connector 9 with a head 10 under the overshot. In this case, the lower wedge 4 of the fixation means is made of easily-drilled material. The drive of the deflection assembly is made in the form of an auxiliary gel 11, equipped with a communication center with a guide rod, including overshot 12, coupling 13, p 14, ball 15 and cover 16. In upper 11, there are upper 17 and lower 18 radial holes and an axial channel 19 connecting them, located under the annular shoulder 2 of the core pipe 1 in the initial position of the guide rod (see Fig. 1). The upper part of the junction gel 11 has grooves 20 and is provided with an element 21 under the overshot.

The detachable diverter is lowered using an overshot (not shown), and the orientator must be included in its design. .

The descent of the jelly 11 is carried out both at the overshot (not shown) and without overshot by its free movement to the bottom of the well through the internal channel of the drill pipe.

Removing the detachable diverter and the emulator is done by overshot (not shown).

The device for changing the direction of the borehole works as follows.

Before changing the direction of the wellbore, a core receiver (not shown) is removed from the core pipe 1 and lifted above the face to a height that is selected so that the radial holes 17 and 18 and the axial channel 19 after delivery to the bottom of the removable diverter and descent of the desire agent 11 were below the collar 2, and the grooves 20 - above it.

Then, on the overshot joined to the head 10, with an orientator (not shown) included in the overshot, a removable diverter is delivered to the core pipe 1, is oriented and the wedge 4 is installed on the bottom, after which the overshot with the orientator is removed.

Next, either on the overshoot, or, as a rule, without the overshot, a descent of the jelly 11 is performed, which hits the head 10 of the removable diverter, under the action of which elements 6 are cut, wedges 4 and 5 are wedged in the wellbore and due to this the slope of the guide rod 7 with a protective tube 8 to the axis of the well, provided by a drilling articulated connector 9 (see Fig.2). If cutting elements 6. For example, when using viscous drilling fluids, significant zenith angles, descending at overshot at low speed due to low impact force does not occur, then the device will have the position shown in FIG.

After the overshot is removed (in the case of the descent, the gel on the overshot), the flushing fluid is supplied to the bottomhole through the drill pipe cavity. If the elements 6 were not cut off, then (see Fig. 1) its free passage to the bottom will be blocked by an annular collar 2 and the fixture 11 placed in it. Thus, a short-term increased pressure of the flushing fluid is created in the cavity of the drill pipe, under the action of which cutting elements 6 and detaching wedges 4 and 5 in the wellbore.

When cutting the elements 6 ut, the chopper 11 together with the guide rod 7 moves lower, whereby the grooves 20 are displaced into the region of the annular collar 2 and the flushing fluid through the grooves 20 freely flows to the bottom of the well (see Fig.2). Receiving a free circulation signal for flushing fluid on the day surface indicates wedges 4 and 5 wedging in the well.

Then the column tube 1 slowly lowers to the bottom. During the descent, the collar 2 is displaced downward relative to the iron set 11. As it moves between the grooves 20 and the upper radial holes 17, the free flow of flushing fluid to the bottom of the well stops again, and an increase in pressure of the flushing fluid is observed on the surface. After moving the collar 2 below the radial holes 17, the washing fluid through the radial holes 17 and 18 and the axial channel 19 flows freely to the bottom (see Fig. 3). Receiving a signal of a temporary increase in pressure of the flushing fluid is a repeated control signal of setting the device downhole and releasing the locking means.

The subsequent rotation of the core pipe 1 with the crown 3 drills the well in a new direction, in which the crown 3 moves along the safety pipe 8, rotates together with it, which prevents the latter from wear by the crown 3. Drilling continues until the bottom hole is formed in the new direction in the course of which the drilling of a material made of easily drilled material, for example, a quick-hardening mixture based on synthetic resin, a wedge 4, is also made (see Fig. 3). Due to the fact that the flushing fluid flows freely to the bottomhole through the radial holes 17 and 18 and the axial channel 19, drilling is carried out at the normal pressure of the flushing fluid. At the same time, the preference 11, resting on the pitch 14 through the ball 15, can freely rotate with the core pipe 1, due to which, firstly, the moment of friction of the removable part of the device on the inner surface of the core pipe 1 is reduced, which increases the reliability of retention by the guide rod of the initially oriented skew and, secondly, the wear of the collar 2 and the weight of the gel 11 is reduced.

Drilling continues until crown 3 forms a bottom in a new direction (see fig.3). In this case, the annular collar 2 will block the lower radial holes 18 and a signal will be received on the surface in the form of an increase in pressure and a decrease in the flow rate of the washing liquid. Drilling to this signal ensures the formation of the bottom hole

in the new direction, and the cessation of drilling when it is received excludes the possibility of filling the core cavity of the core pipe 1 to ensure the subsequent free descent and landing of a removable core receiver.

After completing the curvature of the well bore, do not lift the core tube 1 over the face using

The overshoot (not shown) and the element 21, the reinforcement 11 and the detachable deflector connected to it with the aid of the overshot 12 and the head 10 are removed to the surface. Then lower the core receiver and continue drilling in a new direction. Thus, the use of the proposed device to change the direction of the well bore allows, through the use of shock load and control of detachment

fixation means to increase the reliability of the borehole curvature in the design direction.

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Claims (1)

Invention Formula A device for changing the direction of the well bore, comprising a column pipe with an annular collar on the inner surface, a deflection assembly located in the cavity of the core pipe with a means of fixation, a drive and a guide rod, and a hydraulic indicator of the position of the guide rod, characterized in that operational reliability, the actuator is designed as an adapter with a communication unit for a guide rod, and the hydraulic indicator of the position of the guide rod is designed as an upper and lower radial holes, hydraulically connected by an axial channel and located below the annular shoulder of the core tube in the initial position of the guide rod.