Oil-well sucker-rod pumping unit
FIELD: oil and gas industry.
SUBSTANCE: invention refers to chemical and thermal treatment of a bottom-hole formation zone in developing high-viscosity oil deposits. A hollow cylinder rod is connected to a line of hollow pumping rods. A unit has also a working substance supply unit. This unit is stationary and isolated from a well production gathering line. An inside below an intake screen of the pump, between the cylinder wall and the surface of the hollow rod is divided into two sections. The cylinder rod is common for both sections and extends through a cylinder rod packing. The packing is provided between the sections. The bottom of the cylinder is connected to a tail piece with outlet holes. The tail piece comprises a hollow discharge rod. It is connected to the hollow rod of the pump. A non-return spring-loaded valve is arranged on the outlet of the hollow discharge rod of the pump.
EFFECT: unit comprises the differential sucker-rod pump, a cylinder of which is connected to a flow column; it ensures more reliable operation of the bore-hole sucker-rod pump unit and reducing serviceability.
The invention relates to the oil industry, can be used in the development of high viscosity oil, the production of which requires the application of chemical or thermal treatment of the reservoir, naplastovany, the bottomhole zone of the formation.
Known sucker-rod pumping unit patent for useful model №54404, F04B 47/02, 2010. The system includes a differential pump rod, which has associated with a column of rods differential plunger. The bottom of the plunger is made in the form of a reciprocating floating monolithic rod. The annular space enclosed between the cylinder wall and the surface of the rod, forms a working chamber of the pump with the suction valve, made in the form of coaxially with the cylinder plate with a hole through which is sealed with a mechanical seal skipped a monolithic rod. Below the suction valve set suction filter and plunger pump. The disadvantage is the complexity of the pump when the high-viscosity oil production, where the layer processing steam.
Famous oil well navstevni pump for the extraction of extra-viscous oil on the patent for useful model №90500, F04B 47/02, 2010. For the manufacture of this pump standard pump you want to cut a cylinder of us the sa into two equal parts with thread cutting on the cut. In order to increase the cross-section for the supply of steam into the reservoir to make drilling more holes on the top of the pump cylinder. Adjustment of the plunger is produced so that during operation of the pump plunger blocked the hole when the working stroke of the polished rod. Before injection of steam produced tolerance of the plunger in the lower position to open the holes. The disadvantage is the complexity of the use of a pump.
As the closest analogue of the claimed technical solution chosen well installation for the production and processing of bottom-hole formation zone under the patent for useful model №105939, E21B 47/00, 2011. The installation includes an input node of the working reagent, a column of hollow rods, located in the string of tubing, which is building the sucker rod pump. The pump consists of a hollow rod connected with a column of hollow rods. On the column tubing set packer, the hollow shaft passes through the intake valve. When moving the hollow shaft is driven by a suction valve. The disadvantage is the possibility of ingress of wellbore fluid, malapropistic sediments, mechanical impurities into the column of hollow rods during the operating mode of the pump. This reduces the reliability of the installation and increases the complexity of its service requires updat the enforcement process and dismantling equipment for cleaning. The increased complexity of installation associated with the need to install the packer to prevent working agent through the suction valve of the pump in the processing layer. In addition, when applied at the wellhead flexible high-pressure hoses for supplying the working agent into the hollow rod, there is a danger of breakage or inversion of the sleeve during processing at the working drive (the pumping unit).
The technical result of the invention is to improve the reliability of downhole equipment, oil well pumping unit and reducing the complexity of its installation and maintenance.
The technical result is achieved due to the fact that in the downhole sucker rod pump installation comprising a differential pump rod, the cylinder of which is connected with the column tubing, a rod which is connected with a column of hollow sucker rods, and the input node of the working agent, according to the invention below the receiving filter pump inner space between the cylinder wall and the surface of the hollow rod is divided into two sections, the rod pump is common to both sections and passes through the seal-type rod-cylinder, located between the sections, the lower part of the cylinder is connected with the shank of the output apertures, the shank is hollow magnetite the cent stock, connected to the hollow shaft pump, the output of the hollow injection rod pump is located opposite the spring loaded valve, the inlet node of the working agent is stationary and is separated from the line collection of products.
The technical result is ensured by the fact that at the outlet of the injection rod pump is located opposite the spring loaded valve. The valve prevents clogging of the inner channel of the hollow polished, hollow injection rod and hollow sucker rods, downhole fluid coloperatingsystems sediments, mechanical impurities during use of the pump in operation, when the hollow rod is not available worker agent for processing bottom-hole formation zone. Due to the fact that when applying the operating agent does not clog the inner space of the hollow rod, the processing layer is not required pressure rise, hollow rods do not experience additional loads. This increases the reliability of downhole sucker rod pumping unit and all downhole equipment. In addition, by installing a check valve eliminates the need for additional technological treatments for cleaning hollow sucker rods. Such processing requires dismantling of all equipment. Reduced maintenance efforts downhole equipment.
Due to t the th, lower intake filter pump inner space between the cylinder wall and the surface of the hollow rod is divided into two sections, and the stock pump is common to both sections and passes through the seal-type rod-cylinder" is excluded, the output of the working agent through the suction valve of the pump, which increases the reliability of the installation. The output of the working agent occurs through the holes in the shank, which is connected with the lower part of the pump cylinder. When this separation space of the pump and the presence of stem seal working agent enters the treatment area of the formation, and processed, liquefied downhole fluid enters into the suction valve of the pump through the suction filter. This embodiment prevents the installation of the packer to separate functional zones of borehole installation, which facilitates Assembly and disassembly of all equipment, reduces the complexity of the work.
In wellhead equipment isolation flow inlet node of the working agent is separated from the crop, resulting in the flow of the well fluid flowing from the tubing at the wellhead, not mixed with the flow of the working agent, coming from the mouth in a column of hollow sucker rods. The node separation of threads executed in the rigid version, there is no flexible high-pressure hose. The node at ditsa under the mouth inside the well, which increases the reliability of the equipment as a whole. The host is running, enter the working agent fixed simplifies the Assembly and disassembly of the hard pipe for the supply of the working agent to a mouth.
The figure presents the downhole sucker rod pump installation.
Well sucker-rod pumping system includes equipment wellhead isolation flows, consisting of a node entering the working agent 1 and line collection of products 2, differential pump rod comprising a hollow polished rod 3, the cylinder 5, the injection valve 6, the suction valve 7, the plunger 17, the receiving filter 8. Polished rod 3 from the top is connected with a column of hollow sucker rods 9, the cylinder 5 of the pump in the upper part is connected with the column tubing 10. The inner space of the pump divided by a partition 11 into two sections, between which set the seal 12 of the polished rod 3. The pressure rod 4, which consists of a special hollow rod attached the nipple to a hollow rod of the pump 3. At the end of the injection rod 4 has a reverse spring-loaded valve 13. To the bottom of the pump cylinder 5 is attached to the shank 14 with holes 15 of the output filter. In the casing of the well at the location of the productive formation executed the perforations 16. Well sucker-rod pumping setup is and works as follows.
The column tubing set differential pump rod, to the lower part of the cylinder 5 of the pump is attached to the shank 14 of the tubing with an output filter with holes 16. The pressure rod 4, consisting of the required number of special hollow rod, attach the nipple to a hollow rod of the pump 3. For Assembly of the injection rod and attach it to a hollow shaft pump 3 use the nipple, this rod internal thread on the nipple - outer. This gives you the opportunity to skip injection 4 and the hollow rod 3 inside the differential pump. From ground drive, which can serve as a conventional pumping unit, chain drive or a hydraulic drive transfers energy to the movement of the plunger 17 of the pump, using a column of hollow sucker rods 9. In the pump using a special design of the saddle-plate" 7 suction and discharge 6 valves, which allows you to place the hollow rod 3 inside the pump and the pressure rod 4 to be mounted below the pump. Forced opening-closing 7 suction and discharge 6 of the valve rod of the differential pump prevents them from freezing when high-viscosity oil production. For pumping high viscosity of the downhole product in the bottomhole formation zone, stratiform and naplastovany zone, below the plant and pump serves the worker agent for chemical or thermal processing for the liquefaction product. Before beginning processing block valve on-line collection of products 2 to increase the pressure to the specified level. Mount the high-pressure hose or manifold, connecting the valve Assembly with the reagent and the input node of the working agent 1. Then, through the input node of the working agent 1 equipment wellhead isolation flow pump under davlenym working agent, which is a chemical reagent, or superheated steam in a string of hollow sucker rods 9. If necessary, the equipment produced in the heat-resistant performance. On the hollow polerowanie the rod 3 and the discharge rod 4 working agent is fed into the area below the pump, and through the holes 15 of the output filter of the shank 14 and openings 16 in the casing enters the processing zone. The processing result is the dilution of the downhole viscosity of the product. After injection of estimated volume of the working agent in the treatment area of the formation, and after a predetermined reaction time working agent high-pressure hose or manifold is removed, and the input node of the working agent 1 install the cover and open the valve on-line collection of products 2. A well run operation. Processed working medium is liquefied oil enters the pump through the suction filter 8 and then the column - tubing - in-line collection about the products 2.
Technical solution allows to increase the efficiency and speed of processing bottom-hole formation zone working agent, to supply the working agent in the specified area of the processing, to reduce the flow of the agent through the use of hollow sucker rods 9 and exclude the operations of lowering and lifting of deep pumping equipment at each layer processing.
Thus, the invention improves the reliability of downhole equipment and reduce maintenance efforts downhole sucker rod pumping units.
Oil well pumping installation comprising a differential pump rod, the cylinder of which is connected with the column tubing, a hollow rod which is connected with a column of hollow sucker rods, and the input node of the working agent, characterized in that below the receiving filter pump inner space between the cylinder wall and the surface of the hollow rod is divided into two sections, the rod pump is common to both sections and passes through the seal-type rod-cylinder, located between the sections, the lower part of the cylinder is connected with the shank of the output hole in the shank is hollow injection rod, connected to the hollow shaft pump, the output of the hollow injection rod pump is reverse podrugi the military valve, the input node of the working agent is stationary and is separated from the line collection of products.
SUBSTANCE: proposed system comprises surface data receiving and processing unit connected in supply circuit electrical cable - downhole motor (DHM) with downhole telemetry unit (TU) port. Said TU has a through lengthwise hole to control and to transmit to surface data receiving and processing TU, data covering the parameters of top and bottom beds. Note here that TU port is connected via serial data collection and transmission unit, communication interface and power supply with its extra port whereto connected is well bottom bed parameters metering unit (MU) via sealed connector. Said extra port is intended for transmission of requested date from MU to TU. MU and TU are interconnected via sealed connector fitted in TU case cut-out Said telemetry serial data collection and transmission unit can generate packages of data on top and bottom bed transducer parameters from MU and convert said data for transmission to surface data receiving and processing unit via downhole motor supply cable for said data to be recognized for transmission to user.
EFFECT: better manufacturability of system assembly and higher reliability of operation.
7 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: group of inventions is related to the area of well drilling and intended for transfer of well data to the surface through an electromagnetic communication line. The method for transfer of well data through an electromagnetic communication line is suggested by means of current excitation in the formation surrounding the lower part of the drill string. At that current is excited in the formation by EMF of a free-running generator connected to the string and a coaxial ring isolated from the string. Besides, an additional coaxial ring isolated from the string is introduced to the upper assembly of the pipe string and collection of alternating voltage is done from this ring as induced in the formation close to the string surface by flowing current generated by the radiating ring. At that value of the above voltage is modulated by EMF of the free-running generator controlled in compliance with coded bottomhole data. The device for implementation of the above method is also claimed.
EFFECT: improving reliability of data transfer from the bottomhole through the electromagnetic communication line, expansion of its scope of application and simplification of the device design for manufacture.
2 cl, 2 dwg
SUBSTANCE: in killed well temperature is measured, and the temperature change rate is measured in the depth intervals located within the productive formations, and in the depth intervals located in immediate proximity from productive formations. In the depth intervals located within the productive formations, the sections are separated, the temperature change rate in which is much higher than the temperature change rate in the depth intervals located in immediate proximity from productive formations. The numerical model of temperature change in a killed well is developed which takes into account the influence of formation fluid filtering at the temperature change rate in the killed well, the measurements results are compared with the results of numerical simulation and using the best agreement of measurement results and simulation results the filtration rate of formation fluids in the depth intervals located within the of productive formations are determined.
EFFECT: identification of depth intervals, where fluid flow occurs, and estimation of rate of their filtering in the location of observation well.
8 cl, 7 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to hole surveying and is intended for centring of instruments at their displacement along the borehole. The proposed device for centring of the downhole instruments comprises the main and extra systems of convex plate springs. Ends of the said main system of springs are articulated with extreme support sliders siding on a downhole instrument support guide. The number of springs of the extra system equals that of the main system. Note here that the ends of every spring of the said extra system can slide over the guide of the appropriate spring of the main system.
EFFECT: decreased sizes of downhole instruments, expanded applications.
2 cl, 1 dwg
SUBSTANCE: as per one version of implementation, the method involves well shaft drilling by a drilling bit, determination of an axial load on the bit during drilling of the well shaft, determination of pressure drop in the working surface area of the drilling bit during drilling of the well shaft and determination of the corrected axial load on the bit as per a certain axial load on the bit and a certain pressure drop.
EFFECT: creation of improved drilling bit and method allowing to correct changes in measurement results of an axial load and torque, which occur due to pressure drop in the drilling bit.
20 cl, 6 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: proposed process comprises series of thermometer measurements at quasistationary injection in tubing in interval from its funnel upward to 30-40 m. these measurements are used to define casing pipe tightness above tubing funnel.
EFFECT: accelerated determination.
FIELD: oil and gas industry.
SUBSTANCE: this invention is referred to methods for determining properties of productive formations at oil and gas deposits, in particular to an assessment of their properties. The method for determining the properties of a productive formation drilled by a well includes injection of fluid with a variety of tracer agents of a submicron size to the well bore and productive formation, waiting of flowback and determination of the formation properties. These properties are defined by an analysis of variations in the tracer distribution function against the size and type in the injected and produced fluid.
EFFECT: more efficient assessment of the porous formation properties.
FIELD: physics, computer engineering.
SUBSTANCE: invention relates to a method, a device and a computer-readable data medium used when constructing a geologic model of an oil or other deposit. The invention enables, for markers selected as the initial solution, to calculate marker depths at each well which provide the best overall correlation. The method includes determining, for each marker which is part of a set, a composite function which is the sum of correlation coefficients of a system of well logging techniques for pairs of wells located no more than a given distance from each other. Partial derivatives are calculated for said composite function and the obtained vector is smoothed and used to find a greater value of the composite function at a certain section along said vector. If a greater value is not found, the last position of the marker is considered the solution, otherwise the solution point is smoothed and the process is repeated. The marker depths are sorted at each algorithm iteration.
EFFECT: improved accuracy of calculation of parameters used to construct a geological model of the location of oil or other deposits.
3 cl, 9 dwg
FIELD: machine building.
SUBSTANCE: device comprises tubing, units to feed in tubing and discharge from tubing, video registrator, flash lamps with soft boxes fitted thereat, radio synchroniser of said flash lamps consisting of signal source and signal receiver, screen, drain pipe and synchrocord coupler.
EFFECT: higher accuracy of experiments and enhanced performances owing for better visualisation.
2 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: method of well abandonment with behind-the-casing flows includes running in of the tubing string and installation of cement plugs in the casing string. With geophysical investigations availability of a cement sheath is defined behind the production casing and seal failures are found in the production casing. Then when cement sheath is not detected behind the production casing and seal failures are found in the production casing the cement sheath is grown behind the production casing and failures in the production casing are sealed by plugging. Quality of the production casing plugging is determined by repeated geophysical investigations. Then, small-diameter string plugged from below is lowered from wellhead to bottom. Then additional string is run in from the well bottomhole and a cement plug is installed by pressurised plugging from the bottomhole up to the wellhead using high-temperature cement with addition of fibres in quantity of 0.2% of the dry cement weight. The additional string is removed from the well; the borehole is poured by high temperature cement up to the wellhead. Thereupon the string of low diameter is filled with antifreeze. Then a fibre-optical cable is run in to the macaroni string. Upon the well abandonment temperature distribution is recorded periodically in the well borehole.
EFFECT: higher efficiency and reliability of the well abandonment.
FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to recovery of said well located at multihorizon field. Proposed process comprises injection of isolating composition via well tubing string and fitting of "liquid" packer below tubing string shoe. Then, flow tubing above "liquid" packer is filled with killing fluid. Tubing string is withdrawn from the well. Deflector wedge is fitted inside tubing string. Lateral opening is cut in tubing string above overlaying high-pressure productive bed. Side hole is bored through said bed to extend through its entire depth to make side hole face occur nearby said high-pressure productive bed. Casing string with filter is lowered into bored side hole. Casing string is cemented above filter to the roof of top high-pressure productive bed and said wedge is withdrawn. Hanger with latch joint arranged at its inner surface is lowered on temporary string. Said hanger is fitted inside flow string under side opening. Oil string provided with side opening is lowered into flow string till interaction with latch device so that side openings of both strings are located opposite each other. Then, influx from lateral hole is initiated to remove killing fluid from the well. Then, liner with centring funnel at its shoe and packer hanger at its top is lowered on flexible pipe inside oil string to "liquid" packer. Solvent is injected via said liner. Said solvent destructs said "liquid" packer its residues falling on the face. Now liner is lowered to bottom holes of perforation interval of the bottom low-pressure productive bed. Liner is suspended in oil string above side opening of oil string. Flexible pipe is withdrawn from the well to place the well in operation.
EFFECT: efficient recovery.
SUBSTANCE: method for installation of rapid-moving eduction column includes passing the rapid-moving column into a well, engagement of key for interaction with occlusion with nipple occlusion, extending interacting with profile key on rapid-moving column to interact with corresponding stopping profile in well shaft wall and thus supporting the rapid-moving column. In this method, interaction of the key with nipple occlusion causes extending the key interacting with profile into engagement with stopping profile.
EFFECT: higher reliability of holding the rapid-moving column while keeping relatively large flow diameter of the column.
29 cl, 8 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves dilution of salt rock with fresh or subsaline water by cyclic action on the formation, each of which includes pumping of a working agent to the saline oil formation through a well, closure of the well for the time of salt rock dilution, extraction of liquid from the formation through the same well. Cycles of action on the deposit are repeated till full coverage of the saline formation by action before opening of oil deposits contained in it and production of all the extracted oil deposits. Water pumping to the formation is performed at maximum possible constant bottom-hole pressure till reduction of the well water intake capacity by 2-8 times in comparison to its value at the pumping beginning, and extraction of liquid from the formation is performed at minimum possible constant bottom-hole pressure before the liquid with volume of at least 1.1-1.5 volumes of the fresh or subsaline water pumped to the formation earlier is removed to the surface.
EFFECT: increasing permeability of a saline formation throughout the area of its propagation, increasing productivity of production wells, increasing the coverage of the formation by action, volume of the removed oil deposits and acceleration of development rates.
4 cl, 1 tbl
FIELD: oil and gas industry.
SUBSTANCE: invention relates to submersible pumping units for operation of wells, where it is necessary to increase the differential pressure drawdown, without deepening of submersible pumping unit, and/or with unsealed production casing. The unit for oil-well operation includes the tubing string, electric submersible cable, electric submersible pump, the hydroprotection and submersible electric motor of which are encapsulated in the pressure-tight housing, which is tightly closed on the housing of the input unit of the electric submersible pump, the liner consisting from the pipe string the top part of which through the bushing is tightly connected to the bottom part of the pressure-tight housing, and in the bottom part of the liner the branch pipe with external sealing elements is located. The unit contains at least one packer with internal through passage channel with the diameter allowing to pass through the packer the tool, equipment and instruments, without extracting the packer. The sealing unit for the tight connection with the branch pipe of the liner is located either in the packer housing, or in the device below or above the packer.
EFFECT: improvement of performance of recovery of formation fluid from the wells.
FIELD: oil and gas industry.
SUBSTANCE: unit includes the wellhead equipment, concentrically located tubing strings of two diameters with electrocentrifugal and jet pumps in the production casing of the well. There is a separating camera located in the bottom part of the well bore under the centrifugal pump, equipped with the sealing housing. The unit has the channel for passing of the separated oil connecting the annular space above the pump with the separating camera, and inlet holes for entering the separated water. The sealing housing of the electric centrifugal pump from below in the interval of the separating camera is equipped with the inlet device made as the liner damped from below. The liner is divided into sections with the inlet holes. At the level of each inlet hole the liner is equipped with a glass used as a hydraulic lock for petroleum drips and inlet of water from the separating camera. The inlet holes are located in a single row along the liner and are made with the diameters diminishing in each subsequent section upwards. The gap between the housing and production casing of the well is used as a channel for passing of petroleum drips. The tubing string of the greater diameter in the wellhead equipment is connected to the water line, and tubing string with the smaller diameter - with the oil line. The bottom of the string with the smaller diameter is tightly installed in the upper cylindrical camera of the commutator installed in the tubing string with the greater diameter at the depth below the working level of fluid in the well. The commutator has vertical peripheral channels for passing through them of the upward flow of water and bottom cylindrical camera for placement of plug-in jet pump, the output of which is interconnected with the upper cylindrical camera. Meanwhile the possibility of supply of working fluid into the jet pump from the centrifugal pump, and pumped off fluid - along the side channel of the commutator from the annular space of the well through the check valve located from the external party of the commutator is provisioned.
EFFECT: downhole separation of oil from extracted product of the well and separate lifting of oil and water to the surface during inter-well pumping-over of water for maintaining of formation pressure.
2 cl, 3 dwg
SUBSTANCE: as per proposed method, a pressure brine-carrying formation is developed by means of a well; high-mineralised geothermal brine is removed from it along a production casing string. After that, along an annular space between production and intermediate casing strings, which is interconnected via the wellhead with ground reservoirs and delivery equipment, as well as with an absorption zone formed before development of the brine-carrying formation at the interval of a geological cross-section of the well below the unit of a regional water-tight stratum. Brine is removed during opening, development and further operation of the formation to the absorption zone and the ground reservoirs with a possibility of using a hydraulic mineral potential of the brine from the reservoirs. Protection of the production string against deposition of hard formations on its walls from the produced brine during its movement from the formation to the well mouth is performed by temperature control of the upper part of the string at the interval of probable temperature phase transition due to continuous or periodic pumping along the brine flow in the string with a possibility of heat transfer to it of a heat carrier with initial temperature exceeding expected brine temperatures without any temperature control at the interval of probable temperature phase transition. According to the invention, heat carrier pumping is performed inside the brine lifted along the production string by arranging in the same string of a closed circulation circuit with the heat carrier in the form of service water. This circuit is made in the form of a coaxial heat exchanger drawn in the string to the depth that is not less than the value of phase transition interval. It consists of a heat-conducting vertical cylindrical housing coaxial to the string, closed in the base and provided from above with holes for water supply to the housing. Inside the housing there is a central pipeline with an open lower end that does not touch the base and an upper end opened for water discharge above the well mouth. With that, water is pumped first via an annular space of the heat exchanger, which is formed with the housing and the pipeline, in the direction opposite to the direction of brine lifting via the production string; then, it is supplied via the central pipeline to the heat exchanger outlet. Use of hydraulic mineral potential of the brine is performed with discharge of a less concentrated fluid formed at use together with discharged excess brine from the formation and reservoirs to the absorption zone. Before the fluid is supplied to a common discharge line, it is filtered from mechanical impurities.
EFFECT: enhanced method's efficiency.
5 cl, 3 dwg
FIELD: oil-and-gas industry.
SUBSTANCE: device comprises the string lowered in the well, packer with the flow shutoff device composed of hollow body with bores. Note here that the pipe arranged aligned with its axis and rigidly coupled tuning is provided with top and bottom lines of bores, shear pins and O-rings. Hollow body top end has centring skid. Shear pins are arranged above top line of bores while there above said pipe has thrust ring arranged at spacing equal to that between said top and bottom lines of bores. Hollow body top bores are located above the packer while bottom bores are arranged below the packer. At initial position, top and bottom bores of pipe and hollow body are intercommunicated to communicate above- and under-packer well space with pipe inner space. Pipe shear pins thrusts against the hollow body top end. To shut off product flow from under-packer space this pipe can displace axially relative to hollow body and communicate it with the pipe inner space via the top line of bores. To shut off produce flow from above-packer space this pipe can displace axially downward after destruction of shear pins unless thrust ring thrusts against hollow body top end and above-packer space communicates with pipe inner space via aligned bottom bores of hollow body and top bores of the pipe.
EFFECT: simplified design, unlimited changeover of product flows.
SUBSTANCE: invention relates to mining industry and can be used for operation of problem blocking wells with sucker-rod pumps. The method involves back-and-forth movement and rotation of a sucker-rod string. Downward movement speed of the sucker-rod string changes proportionally to load variation on a wellhead stock. Travel length of the sucker-rod string can be changed proportionally to load variation on the wellhead stock. Rotation of the sucker-rod string can be performed continuously.
EFFECT: possible elimination of blocking of a sucker-rod string without any disassembly of borehole equipment.
3 cl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes rising of oil well fluid through a flow column under impact aimed to change physical properties of the fluid. According to the invention impact on oil well fluid is made by electrode heating in a closed working chamber by means of electric power delivery from the ground surface via a multicore electric cable to the electrodes placed inside the working chamber. In result thermal expansion of the oil well fluid and its flowing to the flow column is ensured via a flow channel with low cross section in regard to its length. At that in order to implement filling of the working chamber and electrode heating of the oil well fluid with its further expansion the unit is equipped with a suction valve to ensure delivery of the oil well fluid to the working chamber, with a pressure valve to ensure flowing of the fluid part from the working chamber to the flow column and batch transportation of the fluid to the ground surface and with a shift force valve with ability of its closure upon complete filling of the working chamber with the fluid and its opening upon heating of the oil well fluid up to the preset value.
EFFECT: improving production efficiency due to temperature impact on the produced oil well fluid.
2 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention suggests the method of borehole and wellhead equipment layout for well survey envisaging injection of injection fluid to the formation and extraction of fluids from the formation, which includes running in of a flow string to the well with a jet pump or a circulation valve intended for compressor operation with isolation of the flow string and annular space. At that the tubing shoe is run in up to the level of upper perforation holes or as much as closer to it. The packer is set at distance of 20 metres at most from the tubing shoe, over the packer or as close as possible to it at one of the flow string pipes one or two circulation valves or a jet pump and a mandrel below them with one or two remote (permanent) pressure and temperature quartz sensors for tubular and annular space. The well head is equipped with a packaging arrangement consisting of a lubricator, two wellhead pressure and temperature sensors to control buffer and annular parameters, a choke chamber with an adjustable choke, a multiphase flow meter, a sampler allowing oil, water and gas sampling in conditions of the well operation, a discharge unit comprising two angled bends and two choke chambers. Connection of a feeder is envisaged for pumping of injection fluid or delivery of working agent from a tank to the buffer line or annular space. The line from the feeder is equipped with a branch pipe via the choke chamber with the adjustable choke back to the tank; a flow meter is mounted in the line from the feeder to the well downstream the branch line in order to control volume of the fluid fed to the well. In order to increase reliability of pressure and temperature measurement one or two self-contained or remote pressure and temperature sensors are mounted under the packer. In order to increase accuracy of phase debit measurement in the formation flow at the flow string over the packer or below it a downhole multiphase flow meter is mounted with functions of continuous monitoring of phase consumption as well as function of downhole pressure and temperature measurement.
EFFECT: for the purpose of direct and back circulation in the well bore a direct and return circulation valves are included into composition of the downhole assembly.
4 cl, 2 dwg
FIELD: oil extractive industry.
SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.
EFFECT: higher efficiency, higher safety.