Well drilling rig

IPC classes for russian patent Well drilling rig (RU 2254433):

E21B7/28 - Enlarging drilled holes, e.g. by counterboring (drill bits for enlarging the borehole E21B0010260000)

E21B17/10 - Wear protectors; Centralising devices (drives used in the borehole with anchoring means E21B0004180000; guiding or centralising devices outside the borehole E21B0019240000)

Another patents in same IPC classes:

Well-drilling device / 2250343
Device has column of double drilling pipes, pilot chisel, expander with body, mounted on double drilling pipes column with possible axial displacement and combined rotation. It is provided with subs, made in form of additional double drilling pipes with outer profiled surface. Expander body is provided with spring-loaded stop for supporting subs. Expander with body is mounted with possible axial displacement and rotation by profiled connection. Expander body is provided with stabilizer. Expander and stabilizer are made detachable.

Method for extraction of gas-hydrate deposits by drilling / 2247827
Method includes extraction of resource by mechanical drilling and extraction of slurry and rock pieces through well. Gas extraction is performed by horizontal drilling with washing and back expansion, with concurrent cleaning and separation of fresh extracted mixture and accumulation of gas. Delivery of expander of ultra-large working size to expansion place is performed through well subjected for backward expansion. Pressure, temperature and composition of washing liquid is adjusted in such a way, that free natural gas, freed during mechanical drilling, was dissolved in drilling mud and separated from it only after passing of separator through rotating preventer. Expander in form of rocker with cutters is used, expanding well diameter up to ten meters and more.

Well expander / 2244796
Device has chisel, body, rock-destroying means placed in side grooves of body with guides, stabilizer, mounted moveably on the body and provided with connection sleeve and rock-destroying means, additional connection sleeve, moveably mounted on body and made with side stopping ports, wherein rock-destroying means are placed.

Protector for well power cable / 2250977
Protector has body of sections, made with possible mutual connection at a well. Body is made with possible mounting at an end of tubing pipes column sleeve. Sections have inner channels for interaction with tubing string, groove for driving power cable and are made with extension at outer surface. Lower section at an end is made with circular recess, and upper - with matching circular groove. Groove for driving power cable is made open in extension at an angle to body axis. In side walls of open groove, in parallel to body axis, inner grooves are made for holding power cable.

Protector for protection of force cable in a well / 2250345
Device has body, groove for placing force cable and deflectors for interaction with operation columns inner channels. Body is made closed in form of eye, with thickened portion and channel for enveloping tubing pipe. In thickened portion a socket is made and groove is placed, made open for inserting at angle α to axis of force cable groove and its connection during screwing together of pipe and sleeve at well mouth. Width of open groove is less than force cable width. Surfaces of socket, enveloping force cable, are made with possible pressing of cable to surface of tubing pipe.

Protector for protection of power cable in a well / 2249668
Device has body, made in form of bracket with inner dimensions for power cable and mounted on sleeve of tubing pipe through mounting rind. On ribs of body open grooves are made with side surfaces for interaction to lower end of sleeve. On the opposite side in open grooves holders are mounted for connection of protector body to mounting ring, passing through apertures of mounting ring for interaction with upper end of sleeve. Central channel in mounting ring is made with eccentricity and with size for outer diameter of tubing pipe for holding body of protector on sleeve.

Device for protection of power cable in a well / 2249667
Device has body and groove for placement of power cable. Body is made closed, of elastic material with thickening and inner conical channel for interaction with conical thread of tubing pipe. Groove is placed on outer surface of body in parallel to its axis at its thickening and has T-like shape, which matches cross-section of power cable, for placement during mounting and holding by T-shaped groove of said power cable during its screwing together in well of next tubing pipe with sleeve.

Detachable protector for drilling pipe / 2244799
Body of device is made in form of bushing of elastic material. Device additionally has transverse bars spaced along circle in amount no less than three, mounted in such a way relatively to bushing, that outward displacement thereof causes increase of inner passing diametric protector size, and having clamps providing for possible connection of external detachers to it, forming said displacement. Bushing and bars are provided with mutual fixing elements, preventing possibility of their relative displacement after assembling. Clamps are placed on bars within range of portions of their mutual axial overlapping with bushing, and in the latter channels are made, providing for possible connection of detachers thereto. Clamps are made on portions of bars, extending beyond bushing limits, bars are fixed in longitudinal grooves made on inner surface of bushing. Each bar has at least one boss, which is deepened into radial aperture of bushing, connecting to outer surface thereof. Clamp is made in form of threaded aperture in the boss. Bars ends extend beyond bushing ends and have shape providing for possible mounting thereof during mounting of device on drilling pipe in appropriate longitudinal grooves of hollow, made on the latter. Bars are pressed into body with possible connection of clamps to detachers.

Well drilling rig / 2254433
Drilling rig includes drilling string located above reamer, borer with body and flushing channel. Centralizer is installed at a distance exceeding half-wave length drilling string flexure during drilling process. Centralizer is made as hinged spring-loaded blades with centering diameter corresponding to well diameter in transport position and to expanded borehole part diameter in working position. Reamer has eccentrically located rock cutting blades. Borer body is made as limiting step and is provided with stabilizing members secured to the body from side of rock-cutting blades.

Spherical centering turbulence promoter / 2255198
Device has body in form of cylindrical bushing. Outside the body three blades are mounted symmetrically, with 120° spacing, relatively to central axis and being supports for device, providing for centering of drilling column. Blade is made of variable width with increase towards end portion, wherein rolling body in form of rubber ball is pressed.

Universal mechanical centralizing device / 2256768
Centralizing device comprises body, spring-loaded centering members arranged in grooves and spaced equal distances one from another. The centering members form calibrating diameter of the device. Centering members are arranged in even or odd manner, concentrically or eccentrically one to another and installed in mating grooves directed at 4°-9° to body axis. The mating grooves converge towards device bottom. Stop nut for calibrating diameter regulation is located on outer body surface in top part thereof. Stop nut is joined with the body by left-handed connection thread and has longitudinal orifices extending along stop nut axis. U-shaped shear clips destined to prevent bottomhole assembly sticking are inserted in stop nut orifices.

Drill string rod centralizer / 2260107
Centralizer has rod, pivotally connected casing halves with supports and retainer adapted to fix casing halves. Casing halves are provided with flat projections. Outer faces of the projections have additional rectangular extensions. Centralizer is provided with two additional casing halves with supports, slots and grooves having characteristics corresponding to that of pivotally connected case halve projections and located transversely to jointing plane. Circumferences and diameters of the supports of pivotally connected and additional casing halves are mutually aligned. Retainers are arranged in supports of additional casing halves, retainer ends are located in pivotally connected casing halves.

Centralizer for casing pipe / 2260667
Centralizer comprises locating member, support members and axes with friction reducing rollers arranged on the axes. Locating member is made as two locating rings. Support members are formed as resilient bars with ends connected to location rings. Resilient bars define boxes in cross-sections of medium parts thereof. Bottoms of the boxes have at least two slots to expose rollers. Roller axes are installed in orifices formed in box sides. Gap is formed between sides of resilient bar boxes and pipe to which centralizer is connected when centralizer is in unloading state.

FIELD: well drilling equipment, particularly for drilling water, oil and gas wells.

SUBSTANCE: drilling rig includes drilling string located above reamer, borer with body and flushing channel. Centralizer is installed at a distance exceeding half-wave length drilling string flexure during drilling process. Centralizer is made as hinged spring-loaded blades with centering diameter corresponding to well diameter in transport position and to expanded borehole part diameter in working position. Reamer has eccentrically located rock cutting blades. Borer body is made as limiting step and is provided with stabilizing members secured to the body from side of rock-cutting blades.

EFFECT: simplified structure, increased efficiency and operational stability.

2 cl, 1 dwg

The invention relates to the drilling technique, namely, devices for expanding the wellbore and can be used for drilling and repair of water wells, oil and gas.

A device for expanding a wellbore [1], which contains an eccentric posted by rock cutting and anvil blades and restrictive level.

A disadvantage of the known device is not a security centration device relative to the extended portion of the wellbore.

Also known drilling tools [2], which includes the extender with the rock cutting blades and zaborniak, the string of drill pipe centralizer.

Known drilling tool provides the focus of the tool relative to the extended portion of the wellbore.

However, the mechanism control centralizer installed on the surface of the well and is connected with the centralizer through the discharge hose, which complicates the use of well-known tool for drilling and repair of deep wells.

Closest to the claimed invention to the technical essence is a device for drilling wells, comprising a string of drill pipe centralizer, extender, zaboric with the body and flushing channel, and the centralizer installed on the string of drill pipe above the expander [3].

A disadvantage of the known device t is aetsa the lack of reliable centration in the process of expanding the wellbore.

The aim of the present invention is to provide apparatus for drilling wells, which is a simpler design provides efficient and stable operation using the properties of the drill pipe to the bend in the drilling process.

The problem is solved in that the device for drilling wells, comprising a string of drill pipe centralizer installed on the string of drill pipe above the expander, zaboric with the body and flushing channel, the centralizer is installed at a distance greater length of the half-wave bending of the drill pipe during the drilling process, and made in the form of a hinged, spring-loaded blades, the diameter of the concentrations of which in the transport position corresponds to the diameter of the hole, and in the working - diameter extended portion of the wellbore, while the extender is made with an eccentric located in rock cutting blades and the casing sabornie made in the form of restrictive level and is equipped with a stabilizing elements attached to the housing by an eccentric posted by rock cutting blades.

In addition, the centralizer is made as calibrator and provided with calibrating elements fixed to the hinged, spring-loaded blades centralizer.

The invention is illustrated in the drawing.

Device for drilling wells in the cancel column of drill pipe 1 clamp 2, the expander 3 zaborniak 4 and the housing sabornie 5. The centralizer is mounted on the string of drill pipe during the drilling process, which are determined by calculation. The clamp 2 is made in the form of a hinged spring-loaded blades 6, provided with a calibrating elements 7. The expander 3 is made with an eccentric located in rock cutting blades 8.

Case 5 sabornie 4 is equipped with stabilizing elements 9 and serves as a bounding step.

The housing 5 is diametrically opposed to restrictive level is the flushing channel 10.

In the transport position, the clamp 2 is fixed by means of the rope 11.

The operation of the device is as follows.

The device is lowered into the well, the barrel of which is subject to extension until the expander 2 zone expansion include rotation at high speed without supplying device on the bottom and the flow of washing fluid.

In the wellbore is formed an annular output due to the flexibility of the drill pipe and the eccentric location of the rock cutting blades.

Further rotation of the device is performed by applying to the annular face at medium speed.

While drilling on the course of the expander 3, equal to the length of the half-wave bending of the drill pipe centralizer 2 with a hinged, spring-loaded lo what authorities in the transport position and restrictive level of housing 5 sabornie 4 will center the device relative to the diameter of the hole, subject to extension.

In the process of drilling as a result of friction in the borehole rope 10 will undergo breakage and to achieve centralizer 2 extended part of the wellbore will switch hinged spring-loaded blades 6 in the working position and further drilling with the extension of the wellbore will continue with a simultaneous focus device relative to the extended wellbore and calibration of the diameter of the enlarged wellbore. After completion of the enlargement process and the final wash well the device is then removed from the wells, however, achievement of a hinged spring-loaded blades narrow portion of the wellbore, they are transferred to the transport position.

Sources of information

1. RF patent №2179618, CL E 21 7/28, 20.02.2002.

2. USSR author's certificate No. 1250640, CL E 21 7/28, 15.08.86.

3. Kalinin A.G. and other Drilling inclined and horizontal wells. Moscow, Nedra, 1997, s, Fig. 6.15.

1. Device for drilling wells, comprising a string of drill pipe centralizer mounted on the string of drill pipe above the expander, zaboric with the body and flushing channel, wherein the centralizer is installed at a distance greater than the length of the half-wave bending of the drill pipe during the drilling process, and made in the form of a hinged, spring-loaded blades, di is m concentrations of which in the transport position corresponds to the diameter of the hole, and in the working - diameter extended portion of the wellbore, while the extender is made with an eccentric located in rock cutting blades and the casing sabornie made in the form of restrictive level and is equipped with stabilizing elements attached to the housing by an eccentric posted by rock cutting blades.

2. The device according to claim 1, wherein the centralizer is made as calibrator and provided celebritysee elements fixed to the hinged, spring-loaded blades.