Well three-axis electromagnetic determination of distance

FIELD: construction.

SUBSTANCE: method of well distance determination is proposed, comprising: drilling a first wellbore comprising an elongated conductive body; installing an electric field sensor in a second wellbore; inducing current along the first wellbore, as a result of which the electromagnetic field is emitted from the first wellbore; receiving the electromagnetic field with the use of the electric field sensor. The electric field of the electromagnetic field is measured, and using the measured electric field for calculating thereby: the orientation of the first wellbore and the distance between the first and the second wellbore, or the direction of the first wellbore relative to the second wellbore.

EFFECT: expanding the arsenal of technical means for determining the distance between the wells.

30 cl, 11 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: system comprises several data acquisition units (one unit per a well subject to risk of boreholes contact) consisting of vibration sensor, amplifier-converter, wireless network and antenna module and personal computer connected to wireless network and having software that includes data receipt unit, multichannel unit for cepstrum calculation, multichannel unit for cepstrum samples storage, multichannel unit for calculating cepstrum correlation, multichannel unit for comparing correlation factors with warning threshold and unit coding data to format of the geological and engineering survey station.

EFFECT: early detection of hazardous contact of a drilled well with existing well and potential change of the drilling path in order to prevent contact of boreholes.

1 dwg

FIELD: mining.

SUBSTANCE: in the process of construction of horizontal well, the deviated hole is drilled through the rocks, descending of the upper casing pipe, cementing the borehole annulus behind the upper casing pipe, drilling the horizontal shaft from the upper casing pipe to the lower oil reservoir, descending of the lower casing pipe with a partial placement of the latter in the lower part of the upper casing pipe, cementing the borehole annulus behind the lower casing pipe, perforation of the horizontal shaft, descending to the upper casing pipe of flow string with a packer with mounting of the packer and the shoe of the flow string in the upper casing pipe over the lower casing pipe, and performing the hydraulic fracturing in the horizontal shaft. As a part of the upper casing pipe in the interval of the upper producing layer the well casing of increased thickness are used, where the packer is placed. During the hydraulic fracturing of the lower oil reservoir the pressure is created over the packer, which is allowed on the upper casing pipe. Then the simultaneous release of pressure above and below the packer is carried out, perforating of the upper casing pipe is carried out in the interval of the upper oil reservoir, and development of the well. The height of the cement sheath between the packer top and the lower oil reservoir is determined from the ratio: LPHFLPOP2, where PHFL is pressure of hydraulic fracturing of the layer, MPa; POP is pressure in the over-packer space in the process of hydraulic fracturing of the layer, MPa; L is the height of the cement sheath between the packer top and the lower oil reservoir, m; 2 is the reliability coefficient of the cement sheath, MPa/m.

EFFECT: elimination of flows in the hydraulic fracturing crack, crushing the production casing above the place of the packer mounting, and reduction of water cut of the excavated product.

1 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to alignment devices, in particular, to devices to be used for alignment of drilling rigs to ensure correct direction of drilling. The laser alignment device intended for use with a drilling rig has an extended drilling rod and a drill head unit comprising at least a pair of laser radiating devices mounted independently at the head unit, at that each laser device can be moved only in one plane and is oriented in essence in opposite directions in regard to each other to set the alignment plane, fasteners to fix the drill head unit to the drill rig and a unit with adjustable length to adjust distance between the head unit and drilling rod.

EFFECT: laser adjustment device is made for alignment of the drilling rod direction in regard to survey marks using the scan plane.

25 cl, 21 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and may be used in construction of horizontal wells. The concept of the invention is as follows: horizontal well construction method includes drilling of a vertical section, a curved section and horizontal section, running of the casing pipe to the well and cementing. According to the invention drilling of a horizontal section is made with input to the productive stratum. Production string is run in with filtering lower part having length not less than the depth of input to the productive stratum. The packer is set above the filtering part of the string. A circulation valve is set above the packer and tubular annulus is cemented through the circulation valve. Upon cementing the packer is drilled out and drilling is continued with entry to the below stratum, rising to the productive stratum and drilling in the productive stratum.

EFFECT: improving increase of the production part of the well, area of its supply and increase of the well flow rate.

1 ex, 1 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat-injection wells, injection of heat carrier into bed, drilling of vertical drain-extract well at the deposit center, dewatering and drying of bed and product extraction therefrom. Note here that heat-injection two-mouth wells are drilled of horizontal-circular profile in radius equal to that of isometric deposit. Drilling is performed by coiled-tubing process (flexible tube) with using of flexible tube as well casing. Said flexible tube is not cemented. Flexible tube is perforated toward deposit center and to vertical drain-extract well.

EFFECT: efficient extraction of bitumen and increased yield.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of ultraviscous oil deposit includes construction of double-mouth upper injector and lower producer with horizontal sections, which are equipped with strainers having stacked openings. The strainer of the injector horizontal section is divided into two heating areas. Inside the strainer, opposite each heating area, liners with holes are installed, which are run in at ends of pipe strings from mouths of the injector. The liners are fixed rigidly to the respective pipe strings with possibility of hermetic closing or opening of the openings in the injector horizontal section. At the surface inner space of the pipe strings inside the injector are bundled by a pipeline with valves, while tubing-casing annulus of the injector is bundled by suction and discharges pipelines equipped with valves and a steam-generating plant. The pumping unit is bundled by hydraulic lines to tubing-casing annulus of the injector. At closed openings of the strainer at the injector horizontal unit heating of the cross-borehole stratum area is made, viscosity of ultraviscous oil is reduced in the stratum by closed circulation of heat carrier through tubing-casing annulus and inner space of the upper and lower double-mouth wells by the steam-generating plant without injection of the heat carrier to the stratum and heated ultraviscous oil is extracted from the producer. In process of closed circulation of the heat carrier through the injector, when temperature in the extraction area of the producer rises up to the value corresponding to viscosity of ultraviscous oil in the stratum sufficient for its solving by a hydrocarbon solvent the steam-generating plant is switched off and circulation of the heat carrier is stopped. Openings in the strainer of the injector horizontal section are opened by means of their matching to the holes in the liners. Hydrocarbon solvent is pumped by the pumping unit through tubing-casing annulus and strainer to the stratum thus forming a chamber with the solvent in the stratum where heated ultraviscous oil is liquefied. At that heated and liquefied ultraviscous oil is being extracted from the producer. As heated and liquefied ultraviscous oil is extracted, in result of stoppage of steam circulation temperature decreases and viscosity of oil increases in the extraction area up to the value corresponding to viscosity of ultraviscous oil in the stratum insufficient for its solving by hydrocarbon solvent. Thereafter the pumping unit is switched off and openings are closed in the upper double-mount injector by means of their disconnection with liners holes. The steam-generating plant is switched on and circulation of the heat carrier is resumed in the upper double-mouth injector. Further the process is repeated.

EFFECT: excluding water flooding of the stratum and water cut of the extracted oil, potential use of the method at bitumen deposits with thickness of layers up to 5-7 m, even development of the deposit, increasing oil recovery factor.

5 dwg

FIELD: mining.

SUBSTANCE: method comprises determining the direction of carrying out counter-heading drivage using instrumental method, drilling counter-heading drivage, charging and blasting the holes, airing the bottomhole and removal of the exploded rock mass. In one of the counter-heading drivage the hole is drilled in the center of the bottomhole. Before drilling in the counter-heading drivage opposite to it the direction of counter-heading drivage is additionally determined on the greatest degree of exposure of vibration of the surface of the rock mass by the palm of the hand by applying the palm of the hand to the surface of the rock mass in the center and in other parts of the bottomhole.

EFFECT: reduction of costs for counter-heading drivage at their breakthrough by reducing the amount of deviation from the predetermined direction at their breakthrough.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling with the boundaries of one formation of parallel horizontal or inclined horizontal injection wells and production well, injection of heat carrier in injection wells and oil withdrawal from production well. Production well is located at equal distance from injection well bottoms which rules out heat carrier outburst bur allows hydrodynamic communication with injection wells. Injection wells are provided with two parallel channels with filters alternating over production reservoir length. Channels are used for injection of heat carrier while, after reservoir heating, one of said reservoirs is used for in-well product flow towards production well.

EFFECT: higher efficiency.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of heat injection wells, injection of heat carrier into bed, drilling of drain holes, well dewatering and product sampling. Note here that drilled heat injection wells feature circular shape. Note also that heat-and-mass transfer occurs via forced convection from heat-injection well. Bed product is extracted via vertical drain-production wells by piston displacement of bitumen and thick oil by superheated high-pressure steam from deposit periphery to vertical drain-production well. Flow density is defined by the formula: P=h(Tf-Ts), where P is heat flow through area unit or interface volume; h is heat emission factor; Tf is fluid flow temperature; Ts is solid phase temperature. Note that heating radius is defined by the formula: r=QsCvτπhi, where Qs is volume flow of steam injected in the well, m3/h; Cv is latent specific heat of vaporisation at injection pressure, kJ/kg; τ is time, h; h is productive bed depth, m; i is specific heat content in steam zone at design pressure, kJ/kg.

EFFECT: higher yield, control over heat carrier distribution.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: at construction of a horizontal oil well construction drilling of a vertical wellbore is done through rocks, including unstable clay rocks with entry to a productive formation, running-in of the production casing up to the productive formation, cementing of a borehole annulus and drilling of a horizontal offshoot from the production string. Running-in of a shank with length from the bottomhole up to the depth of unstable clay rocks not less than 50 m, cementing space behind the shank, perforation of the horizontal borehole and hydraulic fracturing in the horizontal borehole with placement of a hydraulic fracturing arrangement in the production string and setting of the packer for hydraulic fracturing and tubing string shoe in the production string over the shank is carried out.

EFFECT: increase of well productivity.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry, in particular to oil production from wells by the mechanised method, and can be used in any type of pump electric drives. Under the method at wellhead passive acoustic multi-phase flowmeter is installed. Well is operated using the rig with electric drive, and electric drive control station. Well yield and watercut as per phases are determined every second under real time mode. Yield is averaged for selected time period. Further yields as per phases are compared with set process parameters. If watercut values are beyond the set limits the amount of transferred by pump produced water is reduced upon keeping of the commercial oil yield at set level. For this one of action is performed: capacity of pump unit is reduced due to motor speed; capacity of pump unit is increased due to increasing of the motor speed; the pump unit is stopped for definite time for oil accumulation at the wellhead.

EFFECT: yield keeping at set level upon reduced power consumption.

1 ex, 1 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement of perforations in oil wells. The method comprises a. placement of the logging device comprising an ultrasonic receiver-radiator in a well with a casing pipe, and the ultrasonic receiver-radiator has a focal point located at a distance from the ultrasonic receiver-radiator so that it is located behind the internal surface of the casing pipe. b. radiation of ultrasonic signal from the ultrasonic receiver-radiator, c. detection of reflection of ultrasonic signal from internal part of the perforation passing through the casing pipe into formation, d. measurement of time passed between the transmission and reception of ultrasonic signal, e. determination of position of the ultrasonic receiver-radiator, corresponding to ultrasonic transmission and reception of the reflected signal, f. iteration of the step b) - e) several times and record of the obtained data. g. computer processing of the obtained data and determination of sizes of the perforation, h. meanwhile the ultrasonic receiver-radiator is located at a distance from the casing pipe of a borehole, at least, one third of the minimum length of the open channel to be measured, i. meanwhile the distance is such that reflections from the casing pipe reverberate and significantly dissipate before the reflection from inside the perforation is received by the ultrasonic receiver-radiator.

EFFECT: reduction of reverberation noise.

12 cl, 12 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used in prospecting for oil and natural gas deposits. Disclosed is an electromagnetic array configured for use in an underground borehole. The array includes a plurality of axially spaced electromagnets and is configured to generate a magnetic field pattern having at least first and second pairs of magnetically opposing poles. Passive ranging measurements of the induced magnetic field may be advantageously utilised, for example, to survey and guide continued drilling of a twin well. The electromagnetic array may also be used in active ranging. An array of permanent magnets providing a similar magnetic field pattern may also be used in active ranging.

EFFECT: high accuracy of survey data.

3 cl, 15 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method fluid pumping from the well is alternated with fluid accumulation in the well at switched off pump set and average delivery in time is controlled for the purpose of matching with the well flow rate by changing speed rate of the pump shaft. Pump capacity in pumping process is controlled by a submersible flow rate meter placed at the pump output. Pumping out will be performed till the pump reaches the preset minimum pressure at suction and accumulation will be performed till the pump reaches the preset maximum pressure. Pressure value is controlled by means of a submersible pressure sensor. Frequency of the pump shaft rotation during pumping period is changed on the basis of readings of the submersible flow rate meter so that maximum value of efficiency factor is reached for the pump during pumping period. Time of accumulation is limited by regulations on motionless fluid in surface equipment in winter time by permitted decrease of oil temperature in the submersible electric motor and permitted frequency of stops and starts of the latter. Maximum pressure value for the cemented stratum is selected on condition of maximum oil production and for the stratum destructed intensely in extraction process on conditions of minimum discharge of mechanic impurities.

EFFECT: increased production and maintained reliability for submersible equipment due to its operation in the mode of maximum efficiency factor.

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of instruments moving in shafts of wells, drilled via underground beds of mountain rocks. A well measurement instrument comprising a jacket made as capable of displacement inside the well shaft, at least one sensor made as capable of measurement of the well shaft parameter, a controller installed in the jacket comprising at least one of the following: a data saving device and an operation control device, at least for one sensor, and the first port of optic connection installed in the first opening in the jacket, besides, the first port of optic connection includes a light source controlled with the help of electricity, besides, the first hole in the jacket tightly closed by the port plug having an optically transparent window, besides, the port plug is made as capable of resisting the inlet of fluid medium of the well inside the jacket, and the second port of optic connection installed in the second opening in the jacket, besides, the second port of optic connection includes a photodetector, besides, the second opening in the jacket is tightly closed with the port plug, having an optically transparent window, besides, the port plug is made as capable of resisting inlet of fluid medium of the well inside the jacket.

EFFECT: transmission of data on working condition of an instrument and/or data saved in the instrument, and/or transmission of control signals and working instructions to such instruments during location of instruments on earth surface.

13 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to method of tightness testing of the cased injection well. Methods includes: determination of actual pressure difference on the packer ΔCp_a=Pwh1-Pfr-Cwh2+Cfr2-Perr1-Perr2, where Pwh1 and Pwh2 are measured wellhed pressure on injection to top and bottom reservoirs, respectively, Cfr1 and Pfr2 are pressure losses for friction during water movement via short and long strings. respectively, Perr1 and Perr2 are absolute errors of measurements by technical pressure gauge in short and long strings, respectively, atm. At that criterion of the tightness estimation is the pre-specified critical pressure difference ΔCd_cr. System tightness is estimated by comparison of the actual pressure difference on packer ΔCp_a and pre-specified critical pressure difference at |ΔCp_a|>|ΔCd_cr| the system is tight. Method of the tightness testing of the injection well contains stages at which: pressure change is registered in well blocked by the packer, by wellhead pressure measuring at input to tubing string in top and bottom reservoirs, respectively. Data analysis is performed, and tightness is determined. At that preliminary current water flowrate via pipeline is measured Q. Tightness is estimated if the following condition is met: ΔCw_cΔCw_a(QcQa)2, where ΔCw_c and Qc are measured current wellhead pressure difference and current water flowrate, respectively; ΔPw_a and Qa are actual measured current wellhead pressure difference and current water flowrate, respectively. If the condition is met the well is tight.

EFFECT: decreased number of tightness tests in wells operated under process of simultaneous-separate injection.

16 cl, 2 tbl, 2 dwg

FIELD: mining.

SUBSTANCE: electronic probe is offered which contains a metal power supply compartment 1 and a plastic housing 2 conjugate to it where a measurement unit 3, and also a signal processing unit 4 designed as a microcontroller unit, and a magnetic antenna 5, which are filled with a moisture resistant compound. The measurement unit 3 comprises a tilt sensor 6 of longitudinal axis with reference to the horizon, a roll sensor 7 and a pulse stabiliser 8. The plastic housing 2 is made of multilayered fibreglass the inner layers of which are made of vitreous fibres with longitudinal and orthogonal orientation in the housing structure, and external layers are made of vitreous fibres with diagonal orientation. The magnetic antenna 5 and the measurement unit 3 have multilayered high-adhesive moisture resistant coating 11, and the microcontroller unit 4 - the coating 12 of varnish with low adhesive ability to the moisture resistant coating of the measurement unit 3 and the magnetic antenna 5, and they are filled during assembly with the moisture resistant compound 13.

EFFECT: improvement of the probe reliability due to strengthening of the housing and reliable sealing of the main electronic units.

3 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: stopped well is chosen; its flushing is performed, and with that, temperature at the circulation system outlet is recorded. With that, pumping of hot liquid (heat carrier) is performed through annular space, with that, at its inlet the liquid temperature varies as per a periodic law and is recorded, and heat conductivity coefficient λ"п" and coefficients of heat transfer through tubing strings k1 and casing string k2 are calculated as per mathematical formulas.

EFFECT: improving measurement accuracy of an average integral value of heat conductivity of mine rocks as to a well log and determining coefficients of heat transfer through the tubing strings and through the casing string, length of the circulation system of the well.

FIELD: measurement equipment.

SUBSTANCE: invention relates to well measurement devices, used to measure electromagnetic properties of a well shaft. A well measurement instrument is proposed, which includes at least one non-flat antenna configured to transmit and/or receive electromagnetic radiation. At the same time the non-flat antenna includes at least one non-flat loop of an antenna wire turned around the instrument body. Besides, in one version of realisation the non-flat antenna may be considered double-planar, including the first and second sections of semi-elliptical shape, forming the first and second crossing geometric planes. In the other version of realisation axial separation between the non-flat loop of the antenna wire and the central line of the antenna passing along the circumference changes substantially in a sinusoid manner relative to the azimuthal angle along the circumference of the instrument. The sample non-flat antenna according to the invention may be preferably made as capable of receiving and transmitting radiation substantially of purely x-, y- and z-mode.

EFFECT: provision of directional action of an antenna with the possibility to receive signals from different sides.

15 cl, 13 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to production of hydrocarbon raw materials from the productive formation drilled by a well and relates, in particular, to non-radioactive indicators and methods of their use for tracking of movement of treating liquid and formation fluids. The method of the treating liquid movement tracking in the productive formation drilled by a well comprising: preparation of the treating liquid containing multiple indicator additives representing drops of high-viscosity liquid with the diameter no more than 1000 nanometres; pumping the treating liquid with multiple indicator additives into the borehole and productive formation; determination of position and distribution of the treating liquid by registration of changes in the physical properties of the formation caused by inflow of the treating liquid with multiple indicator additives.

EFFECT: improvement of accuracy of determination of position and distribution of the treating liquid by registration of changes in the physical properties of the formation caused by inflow of the treating liquid with multiple indicator additives.

18 cl

FIELD: oil and gas industry.

SUBSTANCE: control system of mutual orientation process of shafts during cluster drilling of oil and gas wells is suggested; the system comprises the core body including power supply source, electromagnetic oscillator made as dipole installed over bit of the drilling well (DW) thus ensuring electromagnetic coupling between DW string and at least one production string (PS) of drilled holes (DH) and the surface part including converter of the parameter being function of electrical performance for a section of the circuit formed by DW string and rock in the vicinity of dipole area to voltage and m converters of the parameter being function of electrical performance for a section of the circuit formed by PS DH and a section of the rock lying between DW bit and PS DH to voltage, where m is a number of PS. At that the above converters are made as toroidal inductance coils placed axially at the wellhead (DW), and m of the same coils is placed at the wellhead, where m≥1; value of current induced in pipe strings is selected as electrical performance for rock sections and is defined as per the mathematical expression specified above.

EFFECT: improved accuracy for determination of a drilling well position in regard to unlimited quantity of production strings of wells drilled earlier with number identification for these wells.

2 cl, 3 dwg

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