Method for determining liquid level in oil well with high temperature for extraction of high-viscosity oil
FIELD: oil and gas industry.
SUBSTANCE: method involves arrangement of an fibre-optic cable in a production well; determination of well shaft temperature; build-up of a temperature vs. well depth graph; indication on the graph of a temperature rise minimum by 10 degrees, which is the closest one to the well head; determination of depth of well liquid level as corresponding to depth of the indicated temperature rise.
EFFECT: determination of liquid level in a well with high temperature for extraction of high-viscosity oil.
The invention relates to the assessment of the level of fluid in oil wells and can be used to determine and control of static and dynamic level of the well fluid, for example, in an oil well.
There is a method of determining the level of fluid in an oil well, according to which form of pulsed acoustic signal at the wellhead in the annular space. Take reflected from the liquid acoustic echo. Convert it into an electrical signal. Determine the transit time of the acoustic signal from the wellhead to the liquid level, the provisions of sections with high and low acoustic density of the gas changes the distribution of sound velocity and position of the abnormal spatial inhomogeneities. Determine the liquid level depending on the values of sound speed on sections of the wells and the travel time of the acoustic signal from the wellhead to the liquid level. When this electrical signal is subjected to analog-to-digital conversion, and the digitized signal is subjected to Fourier transform at each current segment images in accordance with a mathematical formula. Carry out the construction of the graphical image of the spectrogram in the form of three-dimensional surfaces, which determine the location of internal and external heterogeneous the spines annulus. Determine a frequency at which the spectrum has the maximum value at a given time the position of the plot of the echogram. Determine the dependence of the sound velocity from the time given the distance between adjacent staff heterogeneity at a given time position plot showing the formula. As the liquid level in the well define a discrete integration of the functions of the sound speed in the interval from the wellhead to the liquid level (RF patent No. 2447280, publ. 10.04.2012).
The disadvantage of this method is the necessity of using special devices that are missing in the borehole during operation, the unreliability of definitions and sometimes the impossibility of definition of level in wells with high temperatures, producing high-viscosity oil, the frequent failure of the wavemeter due to the influence of high-temperature gas-vapor mixture from the annulus.
Know the use of fiber-optic wireline cables in oil producing wells to collect data about the well parameters (RF patent No. 2445656, publ. 20.03.2012 - prototype).
The disadvantage of this method is that in addition to other measurements in the borehole method is not capable of measuring the liquid level in the well.
In the proposed invention solves the problem of determining the liquid level in the well with high temperatures, mining is Yakovenko oil.
The task is solved by a method for determining the liquid level in the well with high temperatures, mining high-viscosity oil, including the placement of fiber optic cable into the production string, the determination of the temperature in the wellbore, the construction schedule depending on the temperature of the depth of the well, the selection on the graph leap temperature at least 10 degrees, the nearest to the mouth of the well, depth of the fluid level in the well as the corresponding depth of the selected temperature jump.
In high temperature wells, mining high-viscosity oil, the determination of the liquid level presents certain difficulties. Often instruments depth finders can not withstand high temperature, fail or give incorrect readings. In the proposed invention solves the problem of determining the liquid level in the well with high temperatures, mining high-viscosity oil. The problem is solved as follows.
Technology of production of heavy oil in order to periodically monitor the temperature inside of the production string place the fiber optic cable through which detect the temperature throughout the depth of the well. Build a graph of temperature against depth. The graph allocate leap temperature at least 10 gra the moustache, closest to the wellhead. Other temperature fluctuations do not take into account.
Determine the liquid level in the well as the corresponding depth of the selected temperature jump.
In the result it is possible to determine the liquid level in the high-temperature wells, mining high-viscosity oil.
Through the oil hole with a horizontal stem extract oil with a viscosity of 3500 CST, watercut oil is 65 %, the oil output is 54 tons/day, the temperature of the oil varies from 90 to 140°C. In the production string posted by fiber optic cable brand KOB-400-tip attached at the mouth to the metro OITS(optical meter temperature perturbations of the environment). Reading station is displayed on the control center field. Production lead centrifugal pump on the tubing pipe. According to the testimony with fiber-optic cable build a graph of temperature against depth. The graph presented in figure 1.
Figure 1 highlight the leap temperature at least 10 degrees that is closest to the wellhead. Determine the liquid level in the well as the corresponding depth of the selected temperature jump.
The liquid level in the well is 47 meters Comparative data on the wavemeter well confirmed set the config level.
The application of the proposed method will allow us to determine the liquid level in the well with high temperatures, mining high-viscosity oil.
The method for determining the liquid level in the well with high temperatures, mining high-viscosity oil, including the placement of fiber optic cable into the production string, the determination of the temperature in the wellbore, the construction schedule depending on the temperature of the depth of the well, the selection on the graph leap temperature at least 10 degrees, the nearest to the mouth of the well, depth of the fluid level in the well as the corresponding depth of the selected temperature jump.
FIELD: machine building.
SUBSTANCE: device includes two level liquid sensors, three programming outputs of its functional capabilities and four outputs. When the first and the second programming outputs are closed and the third programming output is connected to the third output of the device, it is transformed to a liquid level monitoring and control system with its wavy surface using the first and the second outputs of the device, which provides a mode of liquid level monitoring and supporting at fixed height. When the first and the second programming outputs are open and the third programming output is connected to the third output of the device, it is transformed to the liquid monitoring and control system with its smooth surface in the mode of liquid level monitoring and supporting at its fixed height using the first and the second outputs of the device. When the programming outputs are disconnected, the device is transformed to an upper liquid level control annunciator using the third output of the device or a lower liquid level control annunciator using the fourth output of the device. The invention provides control of loads in the form of an electromagnetic relay or two windings of an electromagnetic starter, as well as in the form of inputs of logic elements of digital microcircuits.
EFFECT: enlarging functional capabilities of the device by increasing the number of controlled liquids and providing the operating mode of the device with wavy surface of controlled liquid.
7 cl, 17 dwg
FIELD: machine building.
SUBSTANCE: device includes the first and the second optic or capacity sensors of liquid level, a control unit, two assemblies of a detachable connection, four programming outputs of its functional capabilities and two outputs. When the first and the second programming outputs are closed and the third programming output is connected to the fourth programming output, the device is transformed to a liquid level monitoring and control system with its wavy surface providing the tank with a liquid filling and emptying mode and a mode of control and supporting of liquid level at its fixed height. When the first and the second programming outputs are open and the third and the fourth programming outputs are connected to each other, the device is transformed to a liquid level monitoring and control system in the tank with its smooth surface providing the tank with a liquid filling and emptying mode and a mode of control and supporting of liquid level at its fixed height. When the control unit is disconnected from liquid level sensors by means of assemblies of detachable connection, the device is transformed to a set of control annunciators of upper liquid level and lower liquid level, which are represented by the first and the second liquid level sensors respectively. The device provides vertical and horizontal erection modes, as well as a combined erection method when erection of the first (second) liquid level sensor is performed using the vertical method, and erection of the second (first) liquid level sensor is performed using the horizontal method.
EFFECT: improving liquid dosing accuracy, enlarging functional capabilities of the device and improving its economy at operation.
FIELD: measurement equipment.
SUBSTANCE: water stage gauge for watercourses of a mountain and piedmont area includes a canal or a river, a water level recorder. The water state gauge is also equipped with a vertical pipe separated into two unequal parts with a vertical partition, and a vertical wall of the first part is equipped with upward inclined water-receiving slots-windows opposite to the flow. At the same time the pipe on top is equipped with a chamber with a recorder and communicates two unequal parts via a float and a stop element installed in a socket, built into the second part of the vertical pipe, communicated with the canal by calibrated openings, and is made in the form of two valves connected to each other as capable of axial displacement relative to each other. Besides, one of the valves is made in the form of a tilted cone with a perforated base and an axial hole in the cone top, through which one end of the guide stem is pulled, being rigidly connected at the bottom with the other valve in the form of a conical plug, and the other end of the stem is placed in the cavity of the second part of the pipe. At the same time the valve in the form of the conical plug in the upper part is additionally equipped with a guide stem stretching via a hole into the base of the tilted cone in its centre and connected by the other end with the float by means of a flexible drive.
EFFECT: increased accuracy and reliability of flow measurement of nonpressure flows with rapid flow regime.
SUBSTANCE: proposed system comprises long part composed of coaxial tube with axial bore, coaxial branch and transducer including transmitter to generate and transmit electromagnetic excitation pulse to pass in said long part and branch. Besides it has receiver to receive reflected pulses wherein near end of long part is connected with distal end of rod to make waveguide for said electromagnetic pulse from transducer. Note here that aforesaid branch is a dielectric of known impedance.
EFFECT: accurate, reliable and safe instrument and method.
21 cl, 8 dwg
SUBSTANCE: device has a level sensor placed vertically in a container and made in form of a coaxial resonator, having at the bottom end section an inner and (or) an outer conductor of a smaller diameter, which is connected to a unit for exciting electromagnetic oscillations in two frequency ranges, measuring and combined transformation of two resonance frequencies of the resonator. The bottom end section of the section of the coaxial resonator with an inner and (or) outer conductor of smaller diameter lies horizontally. In one version of the device, the bottom end section with an inner and (or) outer conductor with a smaller diameter which lies horizontally is filled, in a stepwise manner, by the liquid as it enters the container and is emptied when the liquid is removed from the container. In another version of the device, between the bottom end of the resonator and its section with a smaller diameter there is a horizontal section of a resonator which is filled, in a stepwise manner, by the liquid as it enters the container and is emptied when the liquid is removed from the container.
EFFECT: high measurement accuracy.
3 cl, 5 dwg
SUBSTANCE: device for measuring the level of molten liquid metal includes image measuring instrument (5), measuring probe (6), lifting mechanism (1), displacement sensor (11), data processing system (4) and correction indicator (7). Lifting mechanism (1) is attached to capacity (10) containing molten metal, or installed separately from the capacity containing molten metal, image measuring instrument (5) and measuring probe (6) are mounted on lifting mechanism (1) or independently of lifting mechanism (1), and optic axis of image measuring instrument (5) is set at some angle relative to geometrical axis of measuring probe (6); measuring probe (6) is arranged in the limits of field of view of image measuring instrument (5); at that, image measuring instrument (5), lifting mechanism (1) and displacement sensor (11) are connected to data processing system (4) respectively. Besides, measuring method of molten metal level is described.
EFFECT: providing stable and continuous accurate measurement of molten metal level.
12 cl, 2 dwg
SUBSTANCE: proposed device comprises fuel tanks, fuel level gages connected with temperature gage, calibration pump built around hydraulic motor driven by induction motor with frequency inverter rpm control. It is equipped with fuel tank or tanks calibration mode selector electronic unit connected with frequency transducer and hydraulic motor shaft rpm counter. It incorporates inclination angle transducers and level transducers arranged on every fuel tank and connected to level gage computer. Drain line of one fuel tank is communicated with suction lined of hydraulic motor. Drain line with filter of the latter is communicated with filler hole of second fuel tank. In calibrating one fuel tank, hydraulic motor suction line is connected to extra fuel reservoir. To warn operator, proposed device comprises wireless data transfer system.
EFFECT: higher efficiency, faster calibration.
SUBSTANCE: electrical level gauge includes a housing, a tooth rack, a measurement counter, a drum with a cable and toothed wheel fitted on a shaft. The level gauge is additionally equipped with top and bottom electrical contact sensors mounted on the cable at a distance from each other, a control device, an electromagnet with a shoe lying over the drum. The level gauge is also provided with an electromagnet with a tooth rack which is mounted on the guide of the housing over the toothed wheel and can move on the guide.
EFFECT: high accuracy and reliability of measurements.
FIELD: fire-fighting equipment.
SUBSTANCE: invention relates to fire safety equipment, namely, to devices for testing a stationary foam mixer ensuring supply of extinguishing agent into the fire area by a hose line. This is achieved by the fact that in the stand for testing foam mixer containing the measuring cup, whereon there is a transparent measuring tube and a fitting for connecting to the foam mixer, sensors of upper and lower levels are placed on the tube, which are connected to an electric seconds timer, a fitting of the measuring cup is designed for connection to foam mixer through the hose and the fitting for add-on tank, and for filling the tank with water from the water-system a filling tube is provided, and in case of water overflow from the tank the overflow pipe with a transparent tube is provided.
EFFECT: improved efficacy of fire-fighting due to testing the foam mixer operation with the help of the stand, which has sufficient stability, required in fire suppression systems.
FIELD: instrument making.
SUBSTANCE: method involves arrangement of level gauges with sensors at control points in the capacity, cyclic alternative connection of sensors to measuring device, measurement of parameters of all transmitters in upward direction or in downward direction at each scanning cycle, averaging of measured values per certain time interval, transfer of information signal on the state of transmitters and connection of neighbouring transmitters as the parameters of transmitters change at immersion into or removal from liquid. Every four sensors are connected to each other into measuring circuit on printed-circuit board from which signals are supplied via measuring channel to input of measuring device the controller of which connects outputs of measuring circuits in turn and cyclically and determines medium (liquid or gas) at check point as to the signal value by comparing it to threshold value. When the first and the second sensors connected to the first measuring circuit exceed liquid-gas boundary, signal is increased; when the third and the fourth sensors connected to the second measuring circuit exceed liquid-gas boundary, the signal is increased; when the fifth and the sixth sensors connected to the first measuring circuit exceed liquid-gas boundary, the signal is decreased; when the seventh and the eighth sensors connected to the second measuring circuit exceed liquid-gas boundary, the signal is decreased. At the change of level change direction there excluded is ambiguity of determination of gas or liquid medium at check point owing to certain location and connection of sensors to the measuring circuit. The method is implemented with the system (device).
EFFECT: decreasing mass and dimensions parameters of control system of cryogenic fuel levels owing to reducing the number of pressure seals and connection wires used for connection of transmitters, at maintaining the accuracy and quick action of the system; increasing the number of measuring points the liquid level of which is controlled with one measuring device.
2 cl, 4 dwg
FIELD: measuring equipment.
SUBSTANCE: for determining the characteristics of pore volume and thermal conductivity of matrix of samples of porous materials, the sample of porous material is alternately saturated with at least two fluids with different known thermal conductivity. As at least one saturating fluid a mixture of fluids from at least two fluids with different known thermal conductivity is used. After each saturation of the sample the thermal conductivity of the saturated sample of the porous material is measured, and the characteristics of pore volume and thermal conductivity of the matrix of the sample of porous material is determined taking into account the results of thermal conductivity measurements.
EFFECT: increased accuracy and stability of determining the characteristics of the pore volume and the thermal conductivity of the test samples.
14 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: standard electric logging of a well is carried out in low-temperature rocks, the area of possible bedding of gas hydrates and hydrate formation is identified in them. In the identified area of low-temperature rocks, on the basis of data of standard electric logging, zones are registered, in which measured values of the apparent electric resistance of low-temperature rocks are equal to at least 15 Ohm.m. Coolant is pumped in the investigated rock interval, afterwards thermometry is realised using highly sensitive thermometers, providing for error of temperature measurements of not more than 0.01°C, and zones are sought for, rock temperature in which, relative to the lowest registered temperature in the identified zone is at least by 0.2-0.5°C lower than the temperature of rocks adjacent to the borders of the detected zones. At the same time the latter zones are considered as zones containing gas hydrates. The area of possible bedding and hydrate formation is the area of rock bedding characterised by availability of thermobaric conditions for gas hydrates existence in rocks.
EFFECT: its higher efficiency by detection of gas hydrate rocks bedded in low-temperature rocks below a foot of permafrost rocks.
3 cl, 1 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes delivery of a shank with a set of packers and unions, downhole geophysical multi-purpose device to the hole end at a logging cable. Pumping into the well of a fluid containing thermal- and neutron-contrasting agents and periodical measurements. Contrasting fluid is pumped by several portions with volumes not less than interior volume of the horizontal borehole by means of subsequent switching into operation of different boreholes intervals covered by packers, by means of opening and closure control of outlet connections. Oil is used as a contrasting fluid instead of water. Movement of the contrasting fluid through the borehole is monitored by gamma-ray modules, resistivity meter or thermoconductive flowmeter.
EFFECT: improving accuracy for determination of operating intervals and sources of flooding under conditions of horizontal wells operation.
5 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes acquisition of log data on depth and time for a well drilling by means of a well string; log data on depth and time including data related to factors of torsional and axial loads and data related to hydraulic factor; and determination of a drill string neutral point at the moment of drilling based on factors of torsional and axial loads and hydraulic factor.
EFFECT: determination of a drill string neutral point during well drilling.
20 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: method includes simulating of formation and recording of data on borehole processes by a geophysical instrument run-in into the tubing string at a logging cable and self-contained instruments installed at the lower end of the tubing string. At that simulation of formation is made by breaking a breakable drain valve made of a brittle material of hemisphere shape and installed with a convex part downwards in the lower part of the tubing string; for this purpose a drill stem is fixed under the geophysical instrument and the geophysical instrument is run-in with the stem into the interval with speed sufficient to break the breakable drain valve. At that upper part of the tubing sting above the breakable drain valve is not filled with water and a packer is installed in tubular annulus at the level of the tubing string lower part.
EFFECT: increase of information content and reliability for borehole investigations; reduction of labour intensity, time consumption and equipment costs; possibility to use in wells with any producibility of the investigated formation.
SUBSTANCE: electrodes are separately exposed to the impact of periodically accumulated potential energy of a spring, which is generated by rotating screw pairs and abrupt (impact) release of energy when screw interaction of crests of the screw pairs ceases. The apparatus for realising the method is a drive structure having an output shaft which actuates the screw pairs. During forward rotation, the screw pairs open centralisers and elastically press the electric leads to the wall of the well casing, apply periodic action on the electrodes that are rigidly connected to the electric leads. The electric leads are cut into the wall of the well casing. Impact action occurs when screw interaction between the screw and nut, which is pressed by a power spring, ceases.
EFFECT: improved electrical contact between electric leads and a casing column.
10 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves drilling of production and injection wells, pumping of displacement agent through injection wells and extraction of the product through production wells, drilling of additional wells, and development of residual oil-saturated intervals. According to the invention, in all newly drilled additional wells there determined are residual oil-saturated and flooded intervals prior to the well casing. For that purpose, one-stage determination of temperature field is performed throughout the length of the well in real time both at filling of the shaft with heated washing liquid or water and after it is filled using an optic-fibre system. In case of absorption of washing liquid or water, volume of their supply, which provides full filling of the well, is increased. After the well casing residual oil-saturated and/or water-saturated intervals are developed, and displacement agent is extracted and/or pumped.
EFFECT: increasing oil recovery owing to improving the accuracy of determination of intervals of arrangement of water-saturated and residual oil-saturated zones.
FIELD: oil and gas industry.
SUBSTANCE: electric motor of a submersible pump can be equipped with two rotary shafts, and namely an upper one that is more rotary and a lower one that is less rotary, which are controlled with one common or two different individual current supply cables and connected to the submersible pump and a shutoff element. Lower electric motor is provided with the less rotary shaft controlled with a common or an individual current supply cable. The shutoff element consists of an upper rotating bar and a lower movable bar, which are connected to each other by means of screw thread. The rotating bar is connected from above with the less rotary shaft through a spline square or a hexagon and installed in the housing with possibility of being rotated only on the axis to one and another sides. The movable bar is connected from below between two pass assemblies in the form of mounting seats or seats with a shutter installed in the housing with possibility of being moved only along the axis till tight closing of above and below located mounting seats to assure the possibility of both the control and cutout of the fluid flow of the corresponding formation.
EFFECT: improving reliability and efficiency of the plant.
2 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: system includes control centre of electric-centrifugal pump to power transformer is connected and output of the transformer is connected by power circuits of submersible cable through input lead with submersible electric motor. In downhole part control unit is connected to power supply source by one input and to the first input/output of the amplifier by the other input/output. The second input/output of the amplifier together with input of power supply source is connected through a pressure-seal connector to independent signal circuit formed by transit insulated conductor laid between stator pack and housing of submersible electric motor connected at the other end through input lead with signal core of submersible cable. In surface part this core is connected to output of remote power supply and to the first input/output of transceiver which second input/output is connected to the first input/output of surface control unit and its second input/output is connected to input/output of the control centre of electric-centrifugal pump. The third output is connected to input of remote power source. The amplifier in downhole part and transceiver in surface part are designed to ensure half-duplex operation during data exchange as bidirectional network. Input lead assembly of submersible electric motor is made according to four-contact circuit. In the downhole part independent signal circuit can be prolonged for the purpose of connection to other equipment placed downstream of submersible centrifugal pump by means of this circuit transit through the downhole part of the system in order to arrange measurement and control of actuating mechanisms placed in other areas of the well space. The downhole control unit contains analogue and discreet measuring channels connected to the processor. Outputs of analogue pressure and temperature transducers and test signal shaper are connected to respective inputs of analogue multiplexor which output is connected to input of analogue-to-digital converter. Its second input/output is connected to the first input/output of the processor and the second input/output of the processor is connected to control input of multiplexor. Discreet measuring inputs are connected to vibration sensor and the third input/output is connected to the first input/output of the amplifier. Number of measured parameters is increased due to additional measuring channels and modification of the processor application software.
EFFECT: improvement of the device operational reliability and simplification of the device.
6 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: bore core is selected and examined, induction logging and induced gamma-ray logging or neutron-neutron logging is made and log curves are analysed for the roof of production tier. At that formations with apparent resistivity are identified with values less than 6-8 Ohm/m during induction logging and against values at curves of induced gamma-ray logging or neutron-neutron logging making less 85% and less than values of lower formations. Among these formations it is necessary to select strata without loamy lintels and strata of carbonate oil-filled formations and values of apparent resistivity not less than 15 Ohm/m against data of induction logging. Then sedimentary types for the selected formations is defined and if oil-saturated sandstone is present then conclusion is made about terrigenous origin of these formations. Then values are specified for porosity coefficient, permeability and oil-saturation coefficients and when lower limits for this region are exceeded the indentified formations will be referred to productive formations.
EFFECT: increase of operational efficiency during installation of the bottom-hole complex, improvement of level of detail and authenticity of GIS data for identification of geological rating for rock masses.
FIELD: mining industry.
SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.
EFFECT: optimized well operation.