Method for investigation of horizontal wells

FIELD: oil and gas industry.

SUBSTANCE: method involves running a downhole tool with a coiled tubing into the well. Measurement of downhole parameters, determination of water inflow zones and water-absorbing intervals. Connection of coiled tubing pipe on the surface to the pump for supplying working medium into the well, in this case, prior to running into the well, the downhole tool is placed below in wall of the coiled tubing pipe, there are technical holes cut for pumping in or pumping out the working medium to/from the well bottom, and measurement of well parameters is carried out first in repression-pumping mode, for example, formation water via the coiled tubing pipe into the well, then selection of formation water is carried out in depression mode, and according to abnormal simultaneous changes of the downhole tool, water-absorbing zones and the zones of water-absorbing intervals are set. In this case, the downhole tool readings are transmitted to the surface via the electromagnetic communication channel, then arrangement of the existing technical openings is aligned with location of specified intervals, and water-insulating composition is pumped through the existing technical openings in the coiled tubing pipe. After expiration of the set holding time of water-insulating composition consolidation in said intervals, repeated measurements of downhole parameters are performed.

EFFECT: invention makes it possible to improve the technology for conducting investigations with subsequent implementation of waterproofing, repair and corrective works on coiled tubing pipe in horizontal wells.

3 cl, 1 dwg

 



 

Same patents:

FIELD: measurement equipment.

SUBSTANCE: invention relates to oil and gas industry and can be used for measurement of flow rate of production of oil and gas wells. An unit for measurement of flow rate of oil and gas wells includes at least one system for measurement of flow rates of oil, water and gas, which is hydraulically connected by means of pipelines to an inlet line of the unit, which is connected to oil wells, and to the outlet of the header, which is made in the form of a piece of a pipeline with ascending and descending segments. On the descending segment there installed is a multiphase Coriolis flow meter and at least one parametric sensor. A flow homogenisation device is installed in the pipeline in front of the descending segment. A pipeline connecting the measurement system of flow rates of oil, water and gas to the inlet line of the unit, at the inlet of this system, can be also provided with at least one ascending segment and one descending segment, which are located in series. With that, the system inlet is connected to the outlet of the descending segment of the pipeline.

EFFECT: improvement of measurement accuracy of a phase flow rate in a real time mode due to homogeneity of the measured flow of a gas-liquid mixture.

13 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to versions of a control unit and a produced fluid flow meter for a multipay well. According to the first version the unit comprises a body limited from bellow by a docking device with channels for formation fluid flows and from above by a docking device with adjustable valves installed on it in the quantity equal to that of operated formations. In the body there are interconnected cups, which are coupled hermetically by their hollow butt end to the upper docking device, and cylinders installed by the opposite end in the respective channels of the lower docking device thus forming a tubular annulus and to detached longitudinal channels intended for fluid flows from the respective formations at the wellhead. In the cups there is a crossover seat with radial channels in the cup wall along both sides of the seat. Below the crossover seat from the side of the cup end there are radial channels. Above the crossover seat there is a needle valve made as a slide; at the latter there is a gasket, which facilitates the sealed movement of the needle valve in the cup from an electric drive placed in the sealed part of the cup and fixed in the docking device transferring reciprocal motion to the needle valve in regard to the crossover seat. Electric drives of the needle valves are equipped with devices measuring linear movements of the needle valve with Hall sensors. In the longitudinal channels of the cylinders there are instruments coupled functionally by a cable to a telemetry unit and/or well power supply and/or control point placed in the cup wall so that it may transmit control commands to adjustment valves and data on process parameters of the fluid in the well formations through a cable connector. In the second version of the unit in the cup below the crossover seat there is a channel axial to the crossover seat connecting the longitudinal channel to the tubular annulus and the instruments are placed in the wall of each cylinder and interconnected by a cable in the tubular annulus.

EFFECT: improved reliability for the dual operation of the multipay wells.

4 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: portable metering station of the extracted well liquid includes a vertically installed cylindrical housing that is stepped and composite - upper and lower, which are fixed with a flange connection. In the upper part of the housing there installed is a separating element - hydraulic cyclone provided with a mist eliminator. A gas control valve is installed above the mist eliminator and interconnected with a gas outlet branch pipe. The latter is interconnected with a gas line with connected measuring instruments - a pressure sensor, a pressure gauge and a weight gauge. An inlet liquid branch pipe is interconnected tangentially with the hydraulic cyclone. An outlet liquid line is provided with a mass meter, a moisture meter and a sampling unit, one of which has manual control. A temperature sensor, an information collection and storage unit, which is electrically connected to the measuring instruments, as well as a drain branch pipe with shutoff valves. The gas control valve operates for closing with a pusher of a float stem, which is installed in a sleeve, with a cone-shaped cover plate mounted concentrically and with a gap inside the lower housing. In the sleeve walls on the level of the cover plate base there are side openings connecting the cavity of the hydraulic cyclone to the cavity of the lower housing. Each of the gas and liquid outlet lines in the zone of interaction with a common manifold is provided with check valves.

EFFECT: improvement of operating characteristics.

4 cl, 4 dwg

FIELD: measurement equipment.

SUBSTANCE: measurement of capacity of oil wells connected to a group meter station is carried out by a well switch simultaneously in all connected wells without one in turns and serially, further they determine results of calculation of each well capacity using the formula:

Qi=QΣ-QΣ-1,

Qi - debit of "i" well, connected to the group meter station; Q - total capacity of all wells connected to the group meter station; Q∑-i - readings of flow meter of the total capacity without one (i) well; 1nQi - measured total capacity of wells in turns without one "i" well; n - number of wells connected to the group meter station.

EFFECT: increased accuracy and quality of measurement of capacity in oil wells connected to a group meter station due to efficiency of summary and alternate measurement of each well capacity, provision of sufficient time for true measurement of each well capacity.

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of oil production and to instrumentation and can be used for measurements of oil and gas well flow rate. The device contains an input pipeline, a separator with a float, a gas pipeline with a gas meter and on-off air operated valve fitted with position locks of and the bellow chamber. The liquid pipeline is fitted with a liquid meter and the same valve. Above-bellow (minus) cavities of chambers of both valves are pneumatically connected a gas spool. To the top cavity of the separator the input channel of the switching device with three output channels is connected pneumatically. One output channel of this device is pneumatically connected to the above-bellow cavity of the valve chamber on the gas pipeline. The second output channel is connected pneumatically to the above-bellow cavity of the valve chamber on the liquid pipeline. The third output channel is connected pneumatically to the gas spool on the output pipeline.

EFFECT: design simplification, possibility of measurement of extremely small flow rates of not only liquid, but also gas.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method for determining volume of consumed liquid at pumping from a grouting tank to a delivery line of a pump involves measurement of the number of revolutions of a drive shaft of the pump. From the moment of liquid pumping to the delivery line there additionally measured in the grouting tank is drop in its level in the range sufficient for calculation of a conversion coefficient of the number of revolutions of the drive shaft of the pump to volume of consumed liquid. The current value of volume of consumed liquid is determined depending on surface area of liquid in the tank, drop in level of liquid in the tank, conversion coefficient of the number of revolutions of the drive shaft of the pump to volume of consumed liquid, the number of revolutions of the drive shaft of the pump, which is measured from the moment of completion of measurement of liquid level drop.

EFFECT: improvement of accuracy, simplification and automation of a process for determination of volumes of drilling and grouting liquids pumped to a well.

1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to production of a well fluid, in particular, to the method of measurement of a multi-phase flow of a fluid using a flow meter. The method includes detection of a multi-phase flow in a flow meter by measurement of fluid pressure in a flow meter and usage of the measured pressure to calculate flow density. The total flow through the flow meter is determined on the basis of the calculated density and PVT of the fluid analysis. The corrected total mass flow is calculated using the correction methodology for sliding of liquid/gas. Flow values are also corrected with account of the flow coefficient in leakage that varies together with variations of the Reynolds number for the fluid. Gas and oil fractions may be determined by the corrected total mass flow rate and value of the gas fraction.

EFFECT: increased accuracy of measurement of a multi-phase flow of a fluid.

16 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method consists in measurements of amplitude values of a geophysical parameter along the axis of a cased string of the well and depth H, on which there detected are maximum amplitude values of the measured parameter, as per which depth of the gas-saturated formation is determined. In the well, under action of difference between formation and wellhead pressures, a gas flow of known velocity V is arranged and time distribution of amplitude values of gas humidity in the same flow is measured, and depth of the gas-saturated formation in the well is determined by the following formula: H=V·t, where t - time of occurrence of maximum at time distribution of humidity amplitude values.

EFFECT: simplifying technical implementation of the method due to eliminating the need for geophysical investigations of logging measurements.

2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: out of oil well products in the form of oil-water mixture clean water is extracted by the system of siphons due to creation of hydraulic gate for oil and emulsion flow. Oil and emulsion passing through the hydraulic gate are accumulated by switching and creating hydraulic gate for clean water flow for the purpose of further identification by density gage and measurement by volumetric displacement meter. When liquid is accumulated up to certain level hydraulic gate is created for gas flow. Under action of increasing gas pressure liquid is squeezed from settlers when combined flow-rate controller is open. When liquids level drops in settlers the hydraulic gate is removed and gas flow is started through combined flow gage, combined flow-rate controller. Pressure and temperature is measured during discharge to common header. Volume-flow rate is measured for components of oil, emulsion, water and gas. Pressure of the medium is maintained within the specified interval of its values. Parameters are calculated for measurement process and flow rate of oil wells, at that ratios of liquid or gas flow rates to ascending speed of oil and emulsion bubbles in water or gas bubbles in liquid are ensured by selecting cross-section of hydraulic gate tubing. Arrangement where gas line comprises gas flow meter and gas flow regulator. Gas separator in the lower part is coupled to the common head by combined flow gage, combined flow-rate controller and density gage through a buffer tank, which is connected to a separating tank by gas pipeline and liquid pipeline. Separating tank and buffer tank interconnected by gas pipeline form direct and opposite siphon while separating tank and buffer tank interconnected by liquid pipeline form opposite siphon. The buffer tank is coupled to the common head by measuring line. The separating tank is coupled to the main gas line by gas pipeline and to gas separator through a vertical settler and pipeline forming two direct siphons and two opposite siphons. Bafflers are installed in gas separator between the zone of vertical settler and vertical pipeline. The microprocessor is coupled to gas flow meter, gas flow regulator, combined flow gage, combined flow-rate controller and density gage.

EFFECT: improved quality and efficiency of flow rate measurement for oil well products.

2 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method lies in simultaneous measurement of temperature and pressure at several depths. At that measurements are performed directly upon start-up of the well till stabilisation of temperature occurs in the well borehole within the period of time t defined as per the following formula t<VQ=πR2LQ, day, where V is volume of the borehole horizontal section within the range of pay thickness, m3; L is length of the borehole horizontal section within the range of pay thickness, m; R radius of the borehole, m; Q is well flow rate, m3/day.

EFFECT: improved accuracy in determination of flowing intervals in horizontal wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has body with ports in lower and upper ends, main sensitive elements in form of turbines and packing elements, placed in pairs at body ends, side port made in body between main sensitive elements and converter, connected to surface equipment. In side pipe, mounted inside the body between main sensitive elements, additional sensitive element is placed in form of turbine and thermal sensor. Lower end of side pipe is connected to side port. Diameter of turbine of additional sensitive element is less than diameter of turbines of main sensitive elements. Converter is a control block mounted above body including sleeves locator and electronic microprocessor device.

EFFECT: higher precision.

1 dwg

FIELD: oil and gas production.

SUBSTANCE: invention relates to gas-liquid systems coming from oil production wells. Mixture is separated into liquid and gas in separator. Liquid is periodically accumulated in separator container and then displaced with gas. During this operation, differential pressure for liquid reaching its lower and upper recorded levels and time required for filling recorded volumes are measured as well as absolute pressure and temperature of gas in container. Liquid flow value expressed in weight is calculated using special mathematical dependence. At oil field, liquid and gas enter separator from preliminary gas intake installation or from the first separation step.

EFFECT: increased accuracy of measurement due to avoided gas density registration and excluded necessity of using strictly cylindrically-shaped measuring container.

1 dwg

FIELD: oil extractive industry.

SUBSTANCE: mixture is separated on liquid and gas in separator. Liquid is periodically collected and forced away by gas while measuring absolute pressure and gas temperature in separator tank near upper and lower fixed liquid levels, and times of forcing away of fixed liquid volume. Additionally measured are absolute pressure and temperature in moment when liquid reaches intermediate fixed level. Then liquid is forced from intermediate fixed level to lower fixed level separator is switched off from well, and mass loss of gas is calculated from provided relation. Device for realization of method consists of separator with feeding pipe, in which a three-drive valve is mounted, and draining pipe, which through said valve is connected to liquid outlet channel and to gas outlet channel. Separator is provided with sensors of temperature and pressure and sensors of upper, intermediate and lower levels, mounted in such a manner, that they separate fixed volumes between each other in separator tank, in case of equality of which calculations are simplified.

EFFECT: higher precision.

2 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes measuring volume and denseness of fresh oil in reservoir in case of even or balanced temperature and pressure. Combined sample of fresh oil is taken from pipeline during its draining and denseness of oil and bed water and ballast content is determined. Then mass of drained oil is determined with consideration of measured parameters. Prior to draining, fresh oil from reservoir is exposed until partial separation of bed water, and its denseness is measured. During draining of fresh oil, its denseness,, volumetric share of water therein, pressure and temperature are determined. Drained oil mass and percentage of ballast is determined from given mathematical expressions. Denseness of exposed bed water is measured on basis of sample, taken after exposure of fresh oil in reservoir. Denseness of exposed bed water is measured in its flow during draining from reservoir after exposure and before draining fresh oil. Volume of fresh oil in reservoir is measured continuously by its level and data from graduating table for reservoir. Draining of combined sample of fresh oil from pipeline during its draining is performed manually or automatically in case of constant kinetic condition. After exposure of fresh oil in reservoir point samples of fresh oil are taken, additional combined sample is made thereof and denseness of fresh oil, oil and bed water and ballast percentage is determined from it, and these parameters are used when evaluating precision of determining parameters of drained oil. Measurements of denseness, volumetric water share, pressure and temperature during draining of fresh oil in flow are performed periodically with averaging of current values of measured parameters for time interval, equal to period of change of parameters of fresh oil in reservoir. Mass of bed water MW is determined from given formula.

EFFECT: higher precision.

8 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes separating gas from liquid in the mixture. Liquid is periodically accumulated in calibrated gas separator tank with concurrent by-way of gas into collector and accumulated liquid is pushed out by gas with open pipeline used for draining gas into collector. During pushing away accumulated liquid by gas differential pressure between lower and upper pipeline points is additionally measured. Liquid flow in gas-liquid mixtures is calculated as total of flow of liquid filling calibrating tank, and flow of liquid, carried away by gas from separator, determined from given relation. Method is realized by device, which contains calibrating tank with inlet branch pipe for feeding gas-liquid mixture therein, pipeline for draining gas and pipeline for draining liquid, connected to collector through three-drive valve. Also, following are mounted in separator: level relay-sensor limiting calibrating volume, absolute temperature sensor, absolute pressure sensor and differential pressure sensor between lower and upper separator points. Between lower and upper pipeline points a sensor for measuring differential pressure is mounted. At entrance of pipeline dispersant is mounted for evening gas and liquid speeds.

EFFECT: higher precision.

2 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes measuring average value of flow during adequately picked time for each well of group with successive - according to given program - connection of wells to measuring device and following recalculation of debit to day productiveness. At the same time the most dynamic well of group is selected on basis of one of most unstable parameters. Numeric value of relative quadratic error δ3 of average flow value m(q) is set and recorded in memory of computer, for example, industrial controller. Period of scanning for this well is determined. With same period remaining wells of the group are scanned. Scanning period for each I of them is corrected by comparison of current - actual - relative average quadratic error δmi of average flow value q1 with previously set δ3 from conditions δ≥δ3(1+K); δmi≤δ3(1-K), where K - coefficient for limiting changing range δmi, defining necessity of correction of scanning period for I well towards decrease or increase. If switching moments for measurements of two or more wells from group coincide, order of their scanning is set in accordance to decrease of productiveness of these wells.

EFFECT: higher efficiency.

2 cl, 1 ex

FIELD: oil industry.

SUBSTANCE: device comprises multiple-pass well shifting connected with bullet and terminal controller connected with the turbine flow meter and well shifting. The method comprises measuring time interval before the first pulse corresponding to the measuring cycle of the turbine flow meter and determining time interval required for synchronization of the beginning of fluid accumulation in the bullet and the end of measurements from the measuring time obtained.

EFFECT: enhanced accuracy of measurements.

2 cl, 4 dwg

FIELD: gas industry.

SUBSTANCE: device has two level comparators, two pulse generators, first, second and third active band filters, first and second piezoceramic detectors of flow pressure pulses. Output of first detector is connected to input of synchronizing low frequency amplifier, output of which is connected to input of first filter, output of which is connected to first input of scaling amplifier, output of which is connected to ADC input, output of which is connected to first input of microprocessor controller, output of which is connected to second input of scaling amplifier. Additionally provided are passive two-mode filter, switchboard and fourth filter. Output of second piezoceramic detector is connected to input of two-mode passive filter, output of which is connected to input of fourth filter, output of which is connected to inputs of third and fourth filters, outputs of which are connected to inputs of first and second level comparators, outputs of which are connected to inputs of first and second pulse generators, outputs of which are connected to first and second switchboard inputs, output of which is connected to second input of controller, second output of which is connected to third input of switchboard.

EFFECT: higher efficiency and precision.

2 dwg

FIELD: gas industry.

SUBSTANCE: device has two piezoceramic detectors of flow pressure pulses, output of first of which is connected to input of synchronizing low frequency amplifier. Output of synchronizing amplifier is connected to input of first active band filter, output of which is connected to first input of scaling amplifier, output of which is connected to input of ADC. ADC output is connected to first input of microprocessor controller. First output of controller is connected to second input of scaling amplifier. Device also has level comparator, pulse generator, second and third active band filters, while controller is made with product parameters recorders. Additionally provided are two-mode filter, switchboard and fourth active band filter. Output of second piezoceramic detector is connected to input of two-mode passive filter, output of which is connected to input of second active band filter. Output of second filter is connected to inputs of, respectively, third and fourth filters, outputs of which are connected to first and second inputs of switchboard, connected to level comparator input. Output of the latter is connected to input of pulse generator, output of which is connected to second input of controller. Second output of controller is connected to third input of switchboard.

EFFECT: higher precision.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has container for marked liquid lowered on geophysical cable with depressurization assemblies and driving assemblies and measuring sensors, more than one. Measuring sensors are positioned above and below researched bed range no less than one on each side. As marked liquid, ferromagnetic liquid is used, and as measuring sensors - magnetic field measuring devices.

EFFECT: lower costs, simplified construction, higher precision.

1 dwg

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