Method for accident prevention and elimination, as well as for drilling problems avoidance during drilling operation performing
 Method for drilling wells on depression / 2254438Closed circulation of drill mud is performed by volumetric type pump, included in assembly of drilling tool immediately before chisel. As a pump of volumetric type reversed screw face drive is used. Portion of rotations of drilling column is spent on rotation of screw pump rotor. Operation of rotor starts when load is applied to stator in form of hydraulic resistances to flow in drilling column, chisel and ring-shaped space and reaction of face during application of axial load to chisel. All power spent on drilling is transferred through drilling column to screw pump and chisel. Pressure of drill mud, fed by common slurry pump, on mouth in manifold, is minimal. Feeding of drill mud into manifold is performed in low-pressure mode. Aeration of drill mud is performed by feeding gas into manifold together with mud. Mouth bracing of drill plant made with possible control of well in case of fluid influxes is utilized. Operation of volumetric type pump is used to provide al hydraulic power, spent on circulation of drill mud, including compensation of hydraulic losses in drilling column, in ring-shaped space, in nozzles of chisel and with transfer of required hydraulic energy to provide hydro-monitoring effect of hydro-monitoring jets coming from chisel nozzles, and also hydraulic losses in mouth bracing of drilling plant. |
 Drilling system / 2245984System has drilling column with longitudinal passage for drilling mud with output aperture at end portion, pump device for pumping drilling solution through passage. Ring space between drilling column and drilling well wall contains main mass of drilling mud. Means for adjusting pressure of drilling mud has pump with outlet. It is connected to main mass of drilling mud through outlet pipe. Drilling column includes lower and upper sections. Sections are interconnected by detachable means of connecting lock. Open upper end of lower section is placed in chamber for drilling mud. Upper section passes into chamber for drilling mud though its upper aperture. Chamber for drilling mud includes lower and upper portion. Upper portion is hermetically overlapped from lower one by removable compacting means. |
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Drilling system / 2245984 System has drilling column with longitudinal passage for drilling mud with output aperture at end portion, pump device for pumping drilling solution through passage. Ring space between drilling column and drilling well wall contains main mass of drilling mud. Means for adjusting pressure of drilling mud has pump with outlet. It is connected to main mass of drilling mud through outlet pipe. Drilling column includes lower and upper sections. Sections are interconnected by detachable means of connecting lock. Open upper end of lower section is placed in chamber for drilling mud. Upper section passes into chamber for drilling mud though its upper aperture. Chamber for drilling mud includes lower and upper portion. Upper portion is hermetically overlapped from lower one by removable compacting means. |
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Method for drilling wells on depression / 2254438 Closed circulation of drill mud is performed by volumetric type pump, included in assembly of drilling tool immediately before chisel. As a pump of volumetric type reversed screw face drive is used. Portion of rotations of drilling column is spent on rotation of screw pump rotor. Operation of rotor starts when load is applied to stator in form of hydraulic resistances to flow in drilling column, chisel and ring-shaped space and reaction of face during application of axial load to chisel. All power spent on drilling is transferred through drilling column to screw pump and chisel. Pressure of drill mud, fed by common slurry pump, on mouth in manifold, is minimal. Feeding of drill mud into manifold is performed in low-pressure mode. Aeration of drill mud is performed by feeding gas into manifold together with mud. Mouth bracing of drill plant made with possible control of well in case of fluid influxes is utilized. Operation of volumetric type pump is used to provide al hydraulic power, spent on circulation of drill mud, including compensation of hydraulic losses in drilling column, in ring-shaped space, in nozzles of chisel and with transfer of required hydraulic energy to provide hydro-monitoring effect of hydro-monitoring jets coming from chisel nozzles, and also hydraulic losses in mouth bracing of drilling plant. |
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Method for accident prevention and elimination, as well as for drilling problems avoidance during drilling operation performing / 2272121 Method involves including mudding device in drilling string assembly along with setting predetermined drilling fluid pressure drop at drilling bit; lowering drilling string assembly into well; switching-on mud pumps and performing hydrodynamic well wall treatment with mugging device during well drilling. During drilling of well intervals complicated with oil and gas ingress a number of parameters is recorded and controlled with the use of land-based information-measuring system to determine hydrodynamic well wall treatment time. The parameters to be recorded and controlled are gas content in drilling mud at outlet, mechanical drilling speed; drilling mud level in vessels; drilling mud flow rate at inlet/outlet; drilling mud pressure at inlet, drilling mud temperature at inlet, electric resistance of drilling mud at outlet, drilling mud density at inlet and drilling mud flow velocity at outlet. Rotor torque is measured and hook load is also controlled. |
 Well drilling system and method, system for pressure gradient regulation in drilling fluid column / 2278237Well drilling system to drill well so that well bottom is located under seabed comprises drilling fluid system to create drilling fluid column over well bottom and system to supply incompressible bodies in drilling fluid column in injection zone. Part of drilling fluid column is limited with riser string, which connects underwater marine well head and surface well section. Injection zone is located in riser string near underwater marine well head. Incompressible bodies have densities lesser that of drilling fluid. System for pressure gradient regulation in drilling fluid column over well bottom comprises pipeline located between surface well section and injection zone and system for suspension injection into pipeline. The suspension contains mixture of incompressible bodies and fluid medium. |
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Well construction method / 2281369 Method involves drilling hole from under conductor string to productive formation roof; lowering and cementing protective string; performing primary productive formation exposing along with bottom-hole pressure control; lowering liner and cementing thereof; performing secondary productive formation exposing. Protective string comprises stage cementing collar. Protective string is cemented from string bottom to collar installation depth. Circulation collar orifices are opened. Upper protective string part is flushed. Bottom-hole pressure control is carried out by creating hydraulic resistance by supplying flushing liquid from well head from space defined by conductor string and protective string into space between protective string and drilling pipes and then in reverse direction to well head along with feeding flushing liquid injected through drilling pipes with flushing liquid supply rate regulation. The flushing liquid is supplied via circulation orifices of the collar. |
 Bottomhole drilling equipment with independent ejector pump / 2288342Bottomhole drilling equipment contains device with ejector pump, connected to casing string, drilling bit, connected to drilling column. During operation device with ejector pump remains stationary. Drilling column passes through device with ejector pump. Drilling bit is made with possible operation independently from ejector pump device. Ejector pump has elastic insert, which swells for redirection of flow of drill mud and extracted fluid from internal circular space into device with ejector pump. For swelling of insert fluid under high pressure is used. |
 Device and method for dynamic pressure control in annular space / 2301319Method involves drilling well bore with drill column provided with drill crown, sensors and remote sensing system in lower part thereof, wherein the remote sensing system receives and transmits temperature and pressure data, including that recorded by sensors, to land-based remote sensing system; performing selective drilling fluid injection from drilling fluid source into drill crown and to annular space via drill column with the use of main pump; providing drilling fluid supply pipeline communicated with annular space and adapted to supply drilling mud into reservoir for drilling fluid cleaning; selectively increasing pressure in annular space with the use of drilling fluid backpressure system connected with drilling fluid supply pipeline, wherein the drilling fluid backpressure system includes flow meter, drilling fluid nipple, backpressure pump and drilling fluid source; providing pressure control system to receive drilling data including drill column weight acting on drill crown, drill column torque acting on drill crown, drilling fluid weight, main pump pressure, backpressure pump pressure, drilling fluid flow rate, drill column penetration rate, drill column rotary speed and sensor data transmitted by remote sensing system. Pressure control system also controls pressure in annular space during drilling work performing, simulates prospective well bore pressure to provide continuous drilling and controls main pump and drilling fluid backpressure system in response to existent pressure in annular space and to prospective well bore pressure. |
 Device and method of dynamic control of annulus pressure / 2336407Apackage of inventions is related to oil and gas industry, i.e. to drilling systems. Device includes drill string, run in hole; at that annulus is provided between string and wellbore wall and string includes longitudinal port for drill mud with outlet located in the bottom part of the string, the pump for drill mud injection to annulus through longitudinal port, drill mud discharge pipe connected by fluid medium with annulus, drill mud backpressure system connected by fluid medium with drill mud discharge pipe. Backpressure system includes bypass pipe and three-way valve installed between pump and longitudinal port. The pump is connected by fluid medium with drill mud discharge pipe via three-way valve and bypass pipe that bypasses, at least, a part of the mud longitudinal port. In accordance with the second invention object the backpressure system includes the first and the second flow limitation control devices. |
 Opening method of high-pressure stratums, saturated by strong brines / 2365735Invention elates to deep well construction technology, particularly to opening methods of producing formations. Method includes drilling and fixation of borehole up to top of high-pressure stratum, opening by drilling of high-pressure stratums with usage of measures of anti-fountain blowout. According to invention before lowering of string, fixing borehole up to top of productive stratum, in the range of thief formation, located directly under regional waterproof stratum, by method of frac job it is formed thief zone. After it is implemented fixation of borehole by intermediate casing string, providing communication of formed thief zone through wellhead necking with reserve capacitive fleet and ground-based pumping equipment ensured by sub-lifting of cement grout for 80-100 m up to previous casing shoe. Hereupon it is implemented opening by drilling of target high-pressure stratum. In case of brine-appearance it is implemented withdrawal of natural brine by pumping by ground-based pumping equipment or ensured by itself power of producing high-pressure formation by hole annulus into beforehand formed thief zone. |
 Method and system for management of power consumption at theprocess of drilling by rock and device for drilling by rock for its implementation / 2367767Group of inventions relates to mining industry. Device for drilling contains main power supply for feeding of power for drilling process by rock and includes control system of power consumption during the drilling process by rock, including at least sub processes of impingement attack and/or rotation and washing and containing stages of washing power control at least partially, depending on depth of well, and control at least power of impingement attack and/or power of rotation and power of washing. |
FIELD: well drilling, particularly well drilling with controlling or monitoring pressure or flow of drilling fluid.
SUBSTANCE: method involves including mudding device in drilling string assembly along with setting predetermined drilling fluid pressure drop at drilling bit; lowering drilling string assembly into well; switching-on mud pumps and performing hydrodynamic well wall treatment with mugging device during well drilling. During drilling of well intervals complicated with oil and gas ingress a number of parameters is recorded and controlled with the use of land-based information-measuring system to determine hydrodynamic well wall treatment time. The parameters to be recorded and controlled are gas content in drilling mud at outlet, mechanical drilling speed; drilling mud level in vessels; drilling mud flow rate at inlet/outlet; drilling mud pressure at inlet, drilling mud temperature at inlet, electric resistance of drilling mud at outlet, drilling mud density at inlet and drilling mud flow velocity at outlet. Rotor torque is measured and hook load is also controlled.
EFFECT: prevention of accidents connected with drilling mud absorption by well wall and with well hole fluctuation, increased reliability and efficiency of well hole treatment.
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The invention relates to the drilling of oil and gas wells, and in particular to means of prevention and liquidation of accidents and/or complications during the drilling process.
Known information-measuring system (station geotechnical studies GTI, consoles driller etc), ensuring the prevention of complications and accidents in the process of well construction ("reologicheskie research in the drilling process" EP 39-0147716-102 87, 1087, p.12-15).
These systems provide a continuous reading, collecting, processing and operational analysis of the information received from the information-measuring systems, and provide identification of deviations from the predetermined mode in the drilling process, identifying early signs of complications and possible emergency situations in the well. At pre-emergency/emergency operator station GTI informs drill master or driller about the real geotechnical drilling conditions and makes recommendations for the prevention process complications or accidents. While the operators of the GTI does not have the technical means for the active assistance of the drill team for the prevention and/or elimination of the accident or complications because of information-measuring systems and their methods and software alert about the deviation from specified what about the mode of construction of the well, but do not prevent the process of complications and/or crash.
The known method the hydrodynamic treatment of the walls of the borehole high-pressure jets of drilling fluid, solid particles which create the sealing screen in the surface layer of permeable rocks of the borehole walls (RF patent No. 2101455, CL E 21 10/18, 1988).
Also known way to prevent and eliminate complications and accidents in the drilling process (patent RF №2060353, CL E 21 In 21/00, 1996), containing operations include collimator to the layout of the drill string with the set differential pressure of the drilling fluid to the bit and hydrodynamic treatment of the walls of the well colmatation in the drilling process, taken as a prototype.
The disadvantage of known methods is that in the absence of information about the condition of the wellbore and objective evaluation of filtration processes in the system "well-Plast is not possible to detect the optimal time of release collimator into the well and stop the process of sedimentation. Untimely application of hydrodynamic processing reduces its effectiveness or even makes it useless, because the hydrodynamic treatment of the walls of the borehole during the passage of impermeable rocks are not needed, as when drilling the depth intervals where, according to preliminary prog the RAM is expected a certain kind of complications, it is advisable to register in advance specific information set of parameters that corresponds to this complication. Information should be minimal, but enough to make responsible decisions for the operational management of the drilling process.
The present invention is to improve the efficiency and reliability of the use of hydrodynamic treatment of the wellbore by incorporating operational information of a certain set of parameters that ensure the early recognition of the nature and type of complications.
The problem is solved as follows.
In accordance with the method of prevention and liquidation of failures and complications in the process of drilling, contains an inclusion of collimator to the layout of the drill string with the set differential pressure of the drilling fluid to the bit and climatecare, the Assembly running the drill string into the borehole, the inclusion of drilling pumps and hydrodynamic processing of the borehole walls by colmatation during drilling, during drilling intervals, complicated neftegazopromyshlennikami, in the process of drilling through land information-measuring system of registration and continuous monitoring of complex parameters, is determined by which time the hydrodynamic treatment of the walls of the SC is ageny. This set of parameters includes gas content of the drilling fluid at the outlet, drilling rate, the level of the mud tanks, mud flow rate inlet/outlet pressure of the drilling fluid at the inlet, the temperature of the drilling fluid at the outlet, the resistivity of the drilling fluid at the outlet, the density of the drilling fluid at the inlet and the flow rate of the drilling fluid at the outlet. In addition, the measured torque on the rotor to prevent complications and accidents caused by the absorption of the mud walls of the wells, and controlled by the weight on the hook to prevent complications and emergencies associated with the instability of the wellbore.
The proposed method of prevention and liquidation of failures and complications in the drilling process has the following advantages compared with the known analogues and the prototype.
According to the measurement results of the proposed set of parameters under this method provides early recognition of the nature and intensity of the developing downhole complications and, accordingly, the definition of time is suspended for further deepening of the face to lift the drill string and inclusion in its layout collimator, the descent of the drill string Assembly and the optimal time hydrodynamicist the th treatment of the walls of the well colmatation.
The inclusion of collimator to the layout of the drill string on the basis of and in accordance with the results of the parameters of information-measuring complex allows timely and effective manner to prevent complications in the well by creating a durable sealing layer in the wall of the well.
In practice, the proposed method of prevention and liquidation of failures and complications in the drilling process is implemented as follows.
When drilling in difficult geological conditions, depending on the form of the expected complications, you specify in the construction of wells, installed ground equipment, ensuring in the process of descent of the drill string Assembly registration and continuous monitoring of complex parameters. This complex includes the gas content of the drilling fluid at the outlet, drilling rate, the level of the mud tanks, mud flow rate inlet/outlet temperature of the drilling fluid at the outlet, the resistivity of the drilling fluid at the outlet, the density of the drilling fluid at the inlet and the flow rate of the drilling fluid at the outlet. In addition is controlled by the rotational torque on the rotor when the absorption of the mud walls of the well and the weight on the hook when the volatility of the wellbore.
When passing inter the Alov, where, according to the measured parameters are expected complication, the drilling stops, the layout of the drill string is lifted to the surface and is complemented by colmatation, which is installed directly above the giant chisel. While the total area of the expiry of the jetting nozzles of the bit and collimator are chosen so that when the mud flow rate and rheological parameters will ensure the required flow rate high-pressure jets of collimator.
Next, the layout of the drill pipe with colmatation descends to a complicated section of the wellbore, and is hydrodynamic treatment of the walls of the wellbore.
The parameters of information-measuring monitored the condition of the wellbore and the hydrodynamic time processing of the borehole walls, and when complicated or emergency interval passed and no further sedimentation, layout drill with colmatation is retrieved to the surface, limitator is removed and the layout of the drill pipe down to the bottom and drilling continues without hydrodynamic treatment of the wellbore.
Thus, the proposed method of prevention and liquidation of failures and complications in the drilling process provides control of the hydrodynamic obrabotka the walls of the borehole-specific geotechnical drilling conditions at the optimum complex of the controlled parameters, that eliminates the subjective factor in the evaluation of complications and accidents and increases the efficiency of liquidation.
1. The way to prevent and eliminate complications and accidents in the drilling process contains an inclusion of collimator to the layout of the drill string with the set differential pressure of the drilling fluid to the bit, the Assembly running the drill string into the borehole, the inclusion of drilling pumps and hydrodynamic processing of the borehole walls by colmatation in the drilling process, wherein during drilling intervals, complicated neftegazopromyshlennikami, in the process lowering the drill string Assembly through land information-measuring system of registration and continuous monitoring of a set of parameters which define the hydrodynamic time processing of the borehole walls, and the set of parameters includes gas content of the drilling fluid at the outlet, mechanical the drilling rate, the level of the mud tanks, mud flow rate inlet/outlet pressure of the drilling fluid at the inlet, the temperature of the drilling fluid at the outlet, the resistivity of the drilling fluid at the outlet, the density of the drilling fluid at the inlet and the flow rate of the drilling fluid at the exit.
2. The method according to claim 1, characterized in that it further and the measured torque on the rotor to prevent complications and accidents, caused by the absorption of the mud walls of the well.
3. The method according to claim 1, characterized in that additionally control the weight on the hook to prevent complications and emergencies associated with the instability of the wellbore.