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Cleanup of inclined and horizontal well shafts Drilling mud is circulated by forcing it through drill string with adapter mounted at the start of horizontal section and including hollow case with radial channels made in said case to 30-60 degrees to its axis. Drill mud flow in said adapter in divided into two parts. One part of said flow is ejected via radial channels as a turbulent flow to force slime particles to the well vertical section while another part is fed as a laminar flow to the well horizontal section. |
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Well pressure maintaining method Method involves reduction of supplied drilling fluid by means of a pump interconnected with a drill string in a well, outflow of fluid medium from the well to the first auxiliary pipeline connected to a water separating string, covering of a seal around the drill string, downward pumping of fluid medium via the second auxiliary pipeline with velocity chosen to maintain certain pressure in the well and stoppage of drilling fluid flow through the drill string. |
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Method for drilling through beds with undesirable hydrocarbons Method involves determination of inflow of hydrocarbons into a well bore, determination of reduction of rate of hydrocarbons inflow, switch of control of outlet from a well bore for maintaining selected pressure in the well bore to control of rate of fluid outlet from the well bore to ensure its constant rate, if it drops, return of control of outlet from the well bore for maintaining selected pressure, when inflow of hydrocarbons into the well bore is at the acceptable level. |
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Method for providing access to coal layer Formation method of a well in a coal layer involves drilling of the well mainly having a horizontal shaft in the coal layer using a flushing solution containing liquid, and pressure reduction in a down well so that drilling modes are not higher than balanced ones for drilling, mainly of the horizontal shaft owing to supplying flushing solutions by means of a pump mainly from the horizontal shaft of the well to surface. |
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Present invention aims to create the zone of programmed pressure near bottom-hole assembly with drilling bit by means of sealing installation near bottom-hole assembly, pressure adjustment approximately at the level or insignificantly lower than the threshold pressure of bottom-hole zone surface for provision of influx from the stratum, and adjustment during drilling by means of pumping from bottom-hole assembly or fluid supply restriction into bottom-hole assembly between the zone at programmed pressure and annular space of well bore to prevent overbalance pressure in the zone at programmed pressure, if it is not required for well control. |
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Circulation method and system of fluid medium in system of wells Circulation method of fluid medium in system of wells involves drilling of the first well from surface to underground zone, drilling of the second well from surface to underground zone; at that, the second well crosses the first well at connection point near underground zone, drilling of drain hole from connection point to underground zone by using drill pipes passing through the second well, pumping of drill fluid through drill pipes during drain hole making; at that, drill fluid leaves drill pipes near drill bit of drill pipe, supply of hydraulic fluid downwards via the first well through pipeline; at that, pipeline has hole made at connection point so that fluid leaves the pipeline at connection point and in which fluid mixture is returned upwards via the first well outside the pipeline; at that, fluid mixture includes drill fluid after the latter leaves the drill pipes. |
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Procedure for control of rig operation and drilling rig Invention refers to procedure for control of drilling rig operation wherein consumption of circulating medium flow of rig is determined and operation of rig is controlled on base of this consumption of circulating medium flow. Consumption (FLOW) of circulation medium flow of rig is determined and rig operation is controlled on base of this consumption by means of effecting pressure (p-Flow) of circulating medium. |
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Method of operating pump unit in injection of fluid into formation Pickups are used to control the following parametres: pump rpm, fluid density, viscosity and temperature, pump head allowing for pressure difference and fluid density, pump flow rate allowing for fluid temperature and viscosity and efficiency allowing for fluid viscosity. All parametres averaged for preset time interval are controlled simultaneously in real time mode. In case one of the parametres falls beyond tolerances during said time interval, pickups controlling said parametres are inspected and/or repaired. Pump unit is inspected and repaired in case measured parametres fall beyond bottlenecks. |
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Pump system for circulating fluid Invention refers to oil and gas industry, particularly to pump systems for circulating fluid. The system contains a pup assembly and a driver device rotating the pump assembly. The driver device is actively connected to the pump assembly via a gearing including a master gear and a slave gear. The master gear is connected to the end of the driver device shaft via a resilient coupling. The slave gear is connected to the drive shaft of the pump assembly so that it can not turn. The driver device is flange-connected to the pump assembly housing. |
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Group 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. |
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Opening method of high-pressure stratums, saturated by strong brines Invention 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. |
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Device and method of dynamic control of annulus pressure Apackage 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. |
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Device and method for dynamic pressure control in annular space Method 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. |
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Bottomhole drilling equipment with independent ejector pump Bottomhole 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. |
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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. |
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Well drilling system and method, system for pressure gradient regulation in drilling fluid column Well 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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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. |
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Method for drilling wells on depression 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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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. |
Another patent 2513861.