RU2603322C1 - Method of downhole tools delivery to bottoms of drilled wells with complex profile, carrying out geophysical survey and complex for its implementation - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: group of inventions relates to oil industry and can be used for delivery of downhole tools. Method of downhole tools' delivery to bottoms of drilled wells with complex profile and performance of geophysical survey is characterized by that logging instruments are connected to instrument bridge, in upper part of which lower drill pipe is screwed and by means of their growth instruments are lowered to specified depth. Wellhead and suspended rollers are installed, cable contact tip is placed inside top drilling pipe, which is mounted on single- or triple-strand geophysical cable, which is first passed through cable entry device gland. After that device is screwed in lock part of pipe and geophysical cable with cable contact tip under control of measurement systems of logging station is lowered to depth of location of instrument bridge for performing process operations at joining and fixation of electric contacts of devices of cable contact tip and contact unit. Depending on well conditions, joining and fixation for establishing connection with logging instruments are performed as under weight of contact tip, so by its pumping with flushing fluid. Geophysical cable is fixed in cable clamp, pull-off roller is mounted, and by performing synchronous lowering-lifting of cable and drill pipes with logging instruments in control of axial forces on them, geophysical survey is performed. Method is implemented by means of complex for downhole tools delivery to bottoms of drilled wells with complex profile and performance of geophysical surveys in form of assembly, including instrument bridge with sub, cable contact tip and input device of geophysical cable.

EFFECT: technical result consists in improvement of reliability of downhole tools delivery.

3 cl, 4 dwg

Description

Technical field

The invention relates to the oil industry and can be used for transportation of devices during geophysical surveys in directional, horizontal wells, as well as in difficult geological and technical conditions.

State of the art

Known systems with a rigid geophysical cable, combining the necessary flexibility for winding it on standard winches of logging hoists and sufficient rigidity for pushing devices to the bottom of a horizontal well [1].

The disadvantage of this solution is the limitation of the ability to deliver horizontal wells to geophysical instruments and small masses, which leads to a loss of information content of the applied research complex due to the need to use small-sized downhole tools that are not intended for these purposes.

A known complex for the delivery of geophysical instruments according to the patent for utility model No. 42062, including a geophysical cable, propulsion device, electrical communication device, attachment device of the propulsion device to the geophysical cable, a container, the extension cord consists of seamless steel tubing, and the container consists of pipes from non-conductive material [2].

The disadvantage of this complex is the design limitations of the electrical communication device, which do not allow for high reliability of the electrical connection with the downhole device when it is implemented in sections of wellbores where the values of zenith angles reach 60 or more degrees. This does not allow research in horizontal and directional wells, in the trajectories of which there are long sections of the trunk with values of zenith angles of 60 or more degrees.

A device is known for logging horizontal wells, which contains autonomous geophysical modules lowered into the well, interconnected into an assembly, to the upper part of which is attached an assembly fastening means to the drill pipe string. The assembly contains modules for gamma-ray logging, three-probe neutron-neutron logging, multi-probe electric side logging, wave acoustic logging, acoustic profiler, inclinometer. The assembly can additionally connect modules for spectrometric gamma-ray logging, litho-density gamma-ray logging and caliper-profiler. There is also a ground-based complex and the ability to flush a well through a nozzle installed in the lower part of the assembly [3].

The disadvantages of this device, as well as other well-known autonomous complexes (AMC "Horizon", ATS "Horizontal", etc.) include the lack of a communication line with geophysical modules, which does not allow real-time monitoring of the quality of information recorded by each of modules. It is possible to evaluate the quality of the results of geophysical surveys and transmit information for interpretation only after raising the drilling tool and device to the surface, which significantly increases the time required to issue a logging conclusion and make a decision on the work in the well.

A significant drawback of the device is its limitation in the composition of the used geophysical modules, which does not allow for measurements in wells with a wider range of geophysical instruments (nuclear magnetic logging, acoustic and electrical scanners, lithoscanner), as well as hydrodynamic studies by the formation tester on the cable.

The closest in technical essence and the achieved result to the proposed method and device for its implementation is a pipe logging system with a TLC cable (tough logging conditions), used by Schlumberger (USA) - a prototype. The method allows to deliver geophysical cable logging tools to highly curved or horizontal wells, and can also be used in adverse conditions and deep wells. Mechanical connection of downhole tools with a drilling tool is done through a deep connecting head (DWCH), after which they are lowered to a predetermined depth. The logging cable that provides power to the logging tools and telemetry communication is preliminarily passed through a special sub (CSES), and then connected to the instruments by pumping the movable part of the connecting head (PWCH), where it is fixed on the DWCH head, providing an electrical connection [4], [ 5].

The disadvantages of this system are the design features of the connecting head, in which there is also a mechanism for fixing the moving part of the head, which, in the case of clogging of the circulating holes of the device with solid particles in the washing liquid, makes it impossible to fix the moving part of the connecting head (PWCH) and loss of electrical connection with the downhole tool. To eliminate this problem, it is necessary to make a complete lifting of the drilling tool and preventive repair of the deep part of the geophysical equipment. The known solution involves the use of a seven-core cable, which necessitates the implementation of a complex design of the contact group and does not allow it to be used when measuring with geophysical instruments of Russian manufacturers, working, as a rule, on a single or three-core geophysical cable. In addition, the cable termination device does not provide reliable insulation. The design features of the special sub (CSES) also do not allow you to work with other standard sizes of geophysical cables.

The disadvantages of the method also include the lack of remote control of axial forces arising on geophysical instruments during hoisting operations and when performing geophysical surveys in wells. This requires the use of specially manufactured expensive high-strength devices specially made for such studies.

SUMMARY OF THE INVENTION

The proposed group of inventions solves the problem of performing a full range of geophysical research and work in directional and horizontal wells, as well as in wells with complex geological and technical conditions. The proposed method and equipment for its implementation can also reduce the time spent on geophysical work in wells and improve their quality.

The problem is solved using the characteristics of the 1st claim, such as a method for delivering downhole tools to the faces of complex wells and conducting geophysical surveys, characterized in that the logging tools are connected to the tool bridge, into the upper part of which the lower pipe of the drill string is screwed , and, by building them up, the devices are lowered to a predetermined depth, the wellhead and suspension rollers are installed, the cable contact tilt is placed inside the upper drill pipe A receiver, mounted, for example, on a one- or three-core geophysical cable, which is previously passed through the cable gland of the cable entry device, after which the device is screwed into the castle part of the pipe and the geophysical cable with a cable contact tip, under the control of the measurement systems of the logging station, is lowered to the depth instrument bridge for performing technological operations on docking and fixing electrical contacts of cable contact terminal devices and contact block, moreover, in depending on the downhole conditions, docking and fixing to establish electrical connection with the logging tools is carried out both under the influence of the weight of the contact tip and pumping it with flushing fluid, then the geophysical cable is mounted in the cable clamp assembly, the pull-out roller is mounted, and by means of synchronous cable hoisting and drill pipes with logging tools, while controlling axial forces on them, produce geophysical surveys.

The problem is solved using the characteristics of the 2nd claim, common with the prototype, such as a complex for delivering downhole tools to the faces of complex wells and conducting geophysical surveys, in the form of an assembly, including an instrument bridge with an adapter, a cable contact tip and a device input of the geophysical cable, and distinctive essential features, such as the instrument bridge installed between the geophysical instruments and the drill pipe string, which contains a tip with a threaded connection for connection to geophysical instruments and a contact block connected to a contact head located in the layout of the cable contact tip, an additional force measuring unit and a contact coupling with circulation windows for flushing fluid are additionally installed in the lower part of the instrument bridge housing, the instrument bridge housing is divided into sections interconnected by couplings with holes for washing liquid, and with the help of a sub through a threaded lock connection union of a drill string; the cable contact tip comprises a contact head, a housing with windows for soldering current-conducting cable cores with a knot of cable armor for terminating wires located in it, as well as on the other end, with fixing elements in the form of metal staples; the input device for the geophysical cable is made in the form of an adapter for drill pipes, is attached to them through a threaded nipple for drill pipes and a lock threaded connection located on the opposite side of the case, while in the case of the adapter there is a gland with a valve for the geophysical cable and a universal cable clamp unit .

According to paragraph 3 of the claims, the volume of the housing of the instrument bridge at the junction of the contact block and the contact head is filled with grease, and the volume of the housing of the cable contact tip at the place of soldering the cable conductors is filled with pure mineral oil.

The technical result obtained by using the proposed group of inventions is the achievement of high quality well logging due to reliable delivery on drill pipes in a given research interval of a complete set of geophysical instruments with the possibility of remote control of axial forces arising from their transportation in well bores, as well as operational quality assessment information recorded by each of the geophysical modules.

The technical result is achieved by using the proposed set of equipment, made in overall dimensions, providing transportation of geophysical instruments along the wellbore on drill pipes and centering, reliable docking and fixing of the cable contact tip with the contact block through the use of special fixing devices, as well as circulation of flushing fluid through technological holes of increased diameter to exclude emergency situations with drill t rubbing and ensuring the unhindered passage of rock particles, which will eliminate their influence on the reliability of the electrical connection of the contact tip and block with reliable communication with geophysical instruments. A geophysical cable input device based on a sub for drill pipes provides reliable sealing of a geophysical cable of various diameters.

The invention is illustrated by the following drawings. In FIG. 1 is a diagram of a complex designed to provide mechanical and electrical communication between geophysical instruments, drill pipes and a geophysical cable — an instrument bridge (Fig. 1-a) and a cable contact tip (Fig. 1-6). FIG. 1-c shows a geophysical cable input device, and FIG. 2 is a diagram of a geophysical survey in a well.

The complex for delivering downhole tools to the faces of complex wells and conducting geophysical surveys, in the form of an assembly (Fig. 1, 2), includes an instrument bridge 1 with a sub 2, a cable contact tip 3 and an input device 4 of the geophysical cable 5.

Installed between the geophysical instruments 6 and the drill pipe string 7, the instrument bridge 1 (Fig. 1a) comprises a lug 8 with a threaded connection for connection to the geophysical instruments 6 and a contact block 9 connected to the contact head 10 located in the layout of the cable contact tip 3. B the lower part of the housing of the instrument bridge 1 is additionally equipped with a unit for measuring axial forces 11 and a contact sleeve 12 with circulation windows for washing liquid. The housing of the instrument bridge 1 is divided into sections interconnected by couplings 13 with holes 14 for flushing fluid, and with the help of a sub 2 by means of a threaded joint 15 is connected to the drill pipe string 7.

The cable contact tip 3 (Fig. 1b) contains a contact head 10, a housing 16 with windows 17 for soldering the conductive cores of cable 5 with the wire termination assembly 18 of the armor of cable 5 located therein, as well as at the other end, fixing elements 19 in the form of metal staples 20. The input device 4 of the geophysical cable (Fig. 1c) is made in the form of a sub 2 for drill pipes 5, is attached to them through a nipple 21 with a thread for drill pipes 5 and located on the opposite side of the body, a threaded locking connection 15, while in the case translate 4 is a gland 22 with a valve for logging cable 5 and a universal cable clamp assembly 23.

The volume of the housing of the instrument bridge at the junction of the contact block and the contact head is filled with grease, and the volume of the housing of the cable contact tip at the place of soldering the cable conductors is filled with pure mineral oil.

In FIG. 2 positions marked: 24 - casing; 25 - exhaust block; 26 - hanging roller; 27 - wellhead roller; 28 - logging station.

The complex for the delivery of downhole tools to the faces works as follows (Fig. 1, Fig. 2).

After completion of drilling and preparation of the well for geophysical exploration, the logging tool or their layout (for example, "MAGIS-2") is connected to the instrument bridge using tip 8 and the elevator is installed on the wellhead. The nipple part of the bottom pipe of the drill string is screwed into the locking threaded connection 15 of the sub for connecting to the drill pipe 7 of the instrument bridge, and, by increasing the number of drill pipes, the logging tools are lowered to a predetermined depth. The depth is selected based on the possibility of providing short-term parking of the logging tools during the technological operations of docking and fixing the electrical contacts of the cable contact tip and the contact block 9. The axial forces arising on the body of the logging tools during their descent are estimated using the indications of the weight of the drilling rig .

Next, the logging tools are lowered to a predetermined depth, places of which may be sections of the casing shoe or dense rocks, and wellhead geophysical equipment is installed — suspension and wellhead rollers. A geophysical cable, previously passed through the gland 22, with a cable contact tip is placed inside the upper drill pipe, after which a geophysical cable input device is screwed onto the pipe lock part, which should not go beyond the cased part of the wellbore during research. Operations for lowering the geophysical cable with a cable contact tip are performed with a speed limit, the control of which, like the measurement of depth, is performed using standard logging station registration systems.

There are two options for docking and fixing the nodes of the cable contact tip and the instrument bridge, one of which is realized under the influence of the weight of the contact tip with the cable and can be implemented in wells with zenith angles with values not exceeding 45 degrees. In cases of work in wells filled with high-density drilling fluid, as well as with complex shafts and large zenith angles, the cable contact tip is lowered and docked by pumping it with flushing fluid. The circulation is ensured by the presence of a contact sleeve 12 with circulation windows and openings for the passage of flushing fluid.

After ensuring electrical connection with the logging tools and fixing the cable contact tip in the instrument bridge, using a special clamp, the geophysical cable is fastened to the cable clamp assembly 23 of the input device of the geophysical cable and the installation of a pull-out unit 25 is designed to ensure the technological synchronous descent of the cable and drill pipes.

Further tripping operations are carried out using the recording and control equipment of the logging station 28. The axial forces arising on the logging tools during their descents and ascents are measured using the axial forces measuring unit 11 located in the instrument bridge 1.

Logging data can be recorded both on the descent of logging tools and when they are raised during synchronous movement of drill pipes with a geophysical cable and depth recording using standard logging equipment.

After the completion of geophysical studies, a synchronous, axially controlled, hoisting of drill pipes with logging tools and a geophysical cable is performed until the mouth of the input device for the geophysical cable is lifted. Next, the geophysical cable is released in the clamping unit of the cable 23, due to its tension, the cable contact tip by straightening the clamps of the retainer 19 is mechanically and electrically disconnected from the instrument bridge and rises to the input device of the geophysical cable. The input device is turned away from the drilling tool and, together with the cable and cable contact tip, is laid on the receiving bridges of the drilling rig or on a special platform. The final operation is the extraction from the wellbore of a drilling tool with logging tools using standard technologies used in well drilling.

Example.

The method for delivering downhole tools to the faces of complex wells and conducting geophysical surveys provides for the following sequence of actions and operations. Logging tools are connected to the instrument bridge, the lower pipe of the drill string is screwed into the upper part of the logs, and, by means of their extension, the instruments are lowered to a predetermined depth. The wellhead and suspension rollers are installed, a cable contact tip mounted on a single or three-core geophysical cable is placed inside the upper drill pipe, which is preliminarily passed through the cable entry gland, after which the device is screwed into the castle part of the pipe and the geophysical cable with cable contact tip, under control of the measuring systems of the logging station, lowered to the depth of the instrument bridge to perform technological operations for docking and fixing electric the electrical contacts of the cable terminal and contact block devices.

Depending on the downhole conditions, docking and fixing to establish electrical connection with the logging tools is carried out both under the influence of the weight of the contact tip and its pumping with flushing fluid. Then the geophysical cable is mounted in the cable clamp assembly, a pull-out roller is mounted, and by performing synchronous hoisting of the cable and drill pipes with logging tools, while monitoring the axial forces on them, geophysical studies are performed.

Although the present group of inventions is described by way of examples and drawings, the scope of inventions is not limited to these examples, but is determined only by the claims taking into account possible equivalents.

Information sources

1. A.A. Molchanov, E.E. Lukyanov, V.A. Rapin. "Geophysical exploration of horizontal oil and gas wells." St. Petersburg. Ed. Mining Institute. 2001.S. 143-146.

2. RF patent for utility model No. 42062.

3. RF patent for the invention No. 2353955.

4. The catalog of services of GIS and TAC Schlumberger.

5. Tom Baird, Troy Fields, Robert Drummond, Dave Mathison, Björn Langset, Andrew Martin, Lisa Silipinho. "Logging, TAC and well testing at high pressures and temperatures." Journal of Oil and Gas Review (Schlumberger). Spring 2000. S. 16-33 - prototype.

Claims (3)

1. A method of delivering downhole tools to the faces of complex wells and conducting geophysical surveys, characterized in that the logging tools are connected to the instrument bridge, the lower pipe of the drill string is screwed into the upper part of the well, and, by means of their extension, the devices are lowered to a predetermined depth, the wellhead and suspension rollers are installed, a cable contact tip mounted on a single or three-core geophysical cable, which is pre-installed, is placed inside the upper drill pipe but they pass the cable entry device through the gland, after which the device is screwed into the castle part of the pipe and the geophysical cable with the cable contact tip, under the control of the measuring systems of the logging station, is lowered to the depth of the instrument bridge to perform technological operations for docking and fixing the electrical contacts of the cable contact devices the tip and contact block, moreover, depending on the well conditions, docking and fixing to establish electrical connection with the carot using georeferenced devices, both under the influence of the weight of the contact tip and pumping it with flushing fluid, then the geophysical cable is attached to the cable clamping unit, a pulling roller is mounted, and by means of synchronous hoisting of the cable and drill pipes with logging tools, when controlling axial forces on them, produce geophysical surveys. 2. A complex for delivering downhole tools to the faces of complex wells and conducting geophysical surveys, in the form of an assembly, including an instrument bridge with a sub, a cable contact tip and a geophysical cable input device, characterized in that the instrument is installed between geophysical instruments and the drill pipe string the bridge contains a tip with a threaded connection for connection to geophysical instruments and a contact block connected to the contact head located in the assemblies e cable contact tip, in the lower part of the instrument bridge housing an additional basic force measuring unit and a contact coupling with circulation windows for washing liquid are additionally installed, the instrument bridge housing is divided into sections interconnected by couplings with holes for washing liquid, and using an interlock using a lock a threaded connection is connected to the drill pipe string; the cable contact tip contains a contact head, a housing with windows for soldering conductive cable cores with a cable armor assembly located therein, as well as at the other end, fixing elements in the form of metal brackets; the input device for the geophysical cable is made in the form of an adapter for drill pipes, is attached to them through a threaded nipple for drill pipes and a lock threaded connection located on the opposite side of the case, while in the case of the adapter there is a gland with a valve for the geophysical cable and a universal cable clamp unit . 3. The complex according to claim 2, characterized in that the volume of the housing of the instrument bridge at the junction of the contact block and the contact head is filled with grease, and the volume of the housing of the cable contact tip at the place of soldering the cable conductors is filled with pure mineral oil.

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