Thermal log system for well integrity study. RU patent 2506424.
 Method to detect volume of separated associated oil gas / 2502052Method provides for detection of a volume of separated associated oil gas (AOG) in a preliminary water removal unit (PWRU) or a booster compressor station (BCS). The method is realised on the basis of periodical measurements of hydrogen sulfide content in gas liquid products arriving to the PWRU or BCS and oil, intermediate water and AOG divided in these facilities. According to the method, hydrogen sulfide content is measured quantitatively in the gas liquid mixture, oil and water arriving to the PWRU (BCS). On the basis of the material balance they determine mass yield of H2S within AOG. Taking into account the mass concentration of hydrogen sulfide in AOG, they determine the volume of separated associated oil gas per unit of time. |
 Acoustic method for determination of fluid crossflow point in borehole annulus / 2500888Acoustic method for determination of fluid crossflow point in borehole annulus involves equal movement of acoustic transducer along the borehole and processing of noise signal received at its output, which is used for depth determination of fluid crossflow point. At that in output noise signal of acoustic transducer frequency-stable discreet component f0 is defined and instant Doppler-beat frequency f(t) is registered as transducer moves along the borehole with equal speed. At the moment when instant Doppler-beat frequency f(t) is equal to discreet component f0, time t0 is recorded and depth h0 for noise source is defined against specified mathematical expression. |
 Thermal method for determination of technical condition of wells / 2500887Temperature anomalies are registered by thermometer and fluid crossflow by heat loss anemometer from which output signal output signal of thermometer is subtracted. |
 System and method for minimisation of drilling mud loss / 2500884System contains one or more sources providing data representing aggregated fractures in formation, processor of computer connected to one or more sources of data, at that processor of computer contains carriers containing output code of the computer consisting of the first program code for selection of variety of materials to control drill mud losses out of list of materials in compliance with data representing total number of fractures in formation and the second program code related to the first program code and purposed for determination of optimised mixture for selected materials to control drill mud losses to apply them for fractures; at that optimised mixture is based on comparison of statistical distribution for selected sizes of materials to control drill mud losses and sizes of aggregated fractures. |
 Garipov packer with electronic instrument (versions) and method of its implementation / 2500879Packer with electronic instrument includes mandrel with sealing elements, dividing elements between them, movable and fixed elements. The packer is equipped with electronic instrument with a sensor to control leakproof state of sealing elements in process of well operation. According to the first version electronic instrument with a sensor or sensor of electronic instrument is located in leakproof space at permanent pressure between sealing elements. According to the second version electronic instrument with sensor or sensor of electronic instrument is located outside sealing elements or in sealing and dividing elements. The sensor of electronic instrument is connected hydraulically with leakproof space at permanent pressure between sealing elements. Method of packer with electronic instrument operation includes running-in of tubes with the above packer, measurement of parameters and their transfer to the surface. Electronic instrument with sensor or sensor of electronic instrument is installed with possibility of fluid communication with space between sealing elements in order to control leakproof state of sealing elements; at that packing of the packer is made and leakproof space is formed at permanent pressure between sealing elements as in hydraulic chamber. When packer with electronic instrument with sensor is set parameters are measured in the above space. |
| Method of determination of low-permeability beds in well being drilled / 2499137 Background gamma-ray logging is effected to inject tagged drilling solution and to reciprocate drilling equipment. After reciprocation of drilling equipment, 0.5 m3 of drilling solution are injected with radon concentration making at least 0.175 Gbc per 100 m of well interval to penetrate it additionally. Research interval is flushed in two cycles of circulation to make gamma-ray logging thereafter. Obtained result is compared with background measurement. |
 Method for optimising extraction from well with artificial lifting / 2496974Method for optimising extraction from a well is proposed, in which an artificial lifting system in a well shaft is controlled, and multiple parameters of extraction on surface and in the shaft well are monitored. A well model with calculated data parameters is built. Then, measured data on working face and surface of the well is compared to the model data and reliability of the measured data is checked. After that, difference between measured data and modelled data is diagnosed, and operation of an artificial lifting mechanism is adjusted as per the above diagnostics results. |
 System and method of correction of well shaft direction based on stress field / 2496003Method includes stress inducing in formation around well shaft in order to generate in it some special feature related to induced stress. Measurements presenting well shaft geometry are performed using assembly of drilling string bottom rotated in well shaft, which geometry presents induced stresses in formation. Creation of well shaft image based on its geometry measurements. Evaluation of azimuth variation of induced voltage in formation by well depth. Change of parameter of drilling mode for assembly of drilling string bottom using evaluation of azimuth variation of induced voltage in formation by well depth. |
 By-pass system of oil well pumping unit for dual pumping of well having at least two formations, by-pass system of oil well pumping unit for single and multiple zone wells and by-passing method for well survey / 2495280By-pass system of oil well pumping unit for dual pumping of a well having at least two formations consists of Y-shaped unit installed at pipe string and pumping unit and string of bypass pipes with landing nipple for setting of removable blind plug are connected to the bottom part of this unit. Fishneck is located at setting of removable blind plug in the nipple in Y-shaped unit over the string of bypass pipes while the latter is fixed to the pumping unit by means of clams. Landing nipple is manufacture so that geophysical plug can be set in it instead of removable blind plug. In the well beneath by-pass system with pumping unit there are at least two packers of mechanical, hydromechanical or hydraulic action. Each packer is installed over respective well formation and at formation level between them there is at least one chamber with union or flow adjuster or stationary mandrel or pilot-controlled valve with hydraulic, electrical or mechanical actuation and ability to adjust flow passage with two positions of open and closed. Over the top packer there is pipe string disconnector at which adapter in disengaged status is installed. At the lower end of pipe string there is a blind plug or nipple-hopper. Besides geophysical plug can be set into landing nipple in by-pass of pumping unit instead of removable blind plug and nipple-hopper is fixed at the string of bypass pipes from the bottom. Upwards the latter the string of bypass pipes and pumping unit are interconnected by supporting structure. Telescopic sleeve is installed under the landing nipple at string of bypass pipes. Removable blind plug has sliding skirt in the upper part for pressure balancing and a tip in the lower part for wire or rope fixing. Bypassing method involves trip in hole of the tool at logging cable; the tool is installed at the logging cable with geophysical plug. Two hammers with frictional insert or inner surface with jagged notches are installed at the logging cable. The bottom hammer is installed 10-20 m higher then the tool. The top hammer is installed at bigger or equal distance from location point of geophysical plug in Y-shaped unit before the lower boundary of the surveyed formation. Geophysical plug is made with slide-off bushing in order to balance pressure. |
 Integrated logging tool / 2495241Tool contains sectional case with installed collar locators (CL), gamma-ray loggers (GRL), pressure sensors (P), temperature sensors (T), humidimeter (W), thermoconductive flowmeter (TCF) and resistivity metre (RM) from top downward; in pressurised portion of the case there are GRL, LM and P sensors at that sensitive membrane of P sensor is connected to environment by hydrochannel, while T sensors, W, TCF and RM are located in pressurised cavities of non-pressurised portion of the case. At that T and W sensors are shifted in relation to longitudinal axis of the device at equal distances and are installed in the case at place with two pairs of mutually perpendicular reach-through windows having different width and equipped with cross bulkheads, at that the device is equipped with flowmeter module consisting of centraliser, liner, body and metre run with RPM sensor and rotation direction sensor installed along axis of the body. In the upper part of the device there is also force sensing device, and between the device and flowmeter module there is an additional docking device with clamper and double-hinged mutually perpendicular electroconductive unit with offset of rotation axes in relation to longitudinal axis of the device; the device is equipped with additional three dimensional module or humidimeter (W) or thermal moisture tester (T-W) or viscometer (V). |
 Method of examining wells / 2244105Invention 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. |
 Functional insert for well stream plant / 2244118Device has body placed in body of stream pump and has locking valve and axial channel for logging cable with fixed logging device. Device also has discharge valve. Device body has ports in middle portion, which connect middle hollow portion of device to displacement chamber for stream pump. In upper and lower portions of body of device upper and lower compactors are placed, limited by support elements on each side of the latter, respectively. Locking valve is mounted in lower portion of device and mated with inner space of tubing string and logging device. Axial channels of valves are eccentric and parallel to first channel of device, while discharge valve is provided with rod with its end prominent relatively to body of device. |
 Device for metering pressure / 2244779Device comprises probe (working tip), control-rod, pipeline, communication line, loading jig and measuring station. Probe includes hollow cylindrical body with bottom and cap filled with working liquid, elastic shell sealed from body bottom and top. Formed in non-fixed elastic shell area are perforations. Piston with rod is installed in upper part of hollow body above working liquid. Rod passes through cap in sealed manner. Rod is connected with control rod so that piston may move in axial direction. Formed above piston is cavity connected to pipeline. Hollow body has bottom in which air-tight plug is installed. Measuring device is made as linear piston displacement transducer. Through orifices are formed in hollow body wall near body bottom. Arranged from body outside are vertical or inclined grooves aligned with through orifices by lower ends thereof. Air-tight plug is provided with adjustable rest for restricting piston stroke. |
 Method for monitoring underground placement of liquid industrial waste in deep water-bearing horizons / 2244823Method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described. |
 Method for examining horizontal wells / 2244824Method includes lowering protective container to the well to portion of intensive curvature of shaft, which container is fixed at end of drilling pipes, lowering of geophysical device into protective container on lower portion of logging cable, delivery of protective container with geophysical device to pit-face by consecutive extending of drilling pipes column, lowering of upper portion of logging cable through remote-controlled compactor of logging cable fixed on branch of swivel, into drilling pipes, until electric contact to free end of lower portion of logging cable via detachable connecting sleeve, geophysical examining of shaft during raising of geophysical device together with drilling pipes with appropriate connection-disconnection of fixing ends of lower and upper portions of logging cable when screwing away each following drill stand. When examining wells having extensive steeply slanted portion of well shaft with zenith angle of 50°-90°, where lowering of upper portion of logging cable to electrical contact with free end of lower portion of logging cable via detachable connecting sleeve under its own weight is difficult due to friction at drilling column wall, forced lowering of detachable connecting sleeve is performed by feeding washing liquid under pressure into drilling pipes and concurrent adjustment of pressure in chamber of remote-controlled compactor of logging cable. Pressure in chamber of remote-controlled logging cable compactor is achieved to be close to pressure of washing liquid in drilling pipes, to provide for optimal speed of cable lowering and its pressurization, and after connection of detachable connecting sleeve to lower portion of logging cable during raising and lowering of drilling pipes, examinations of well are performed. |
 Method for determining type of carbonate collector on basis of data from specialized well research / 2245442Method includes examination of exploring, product or force well, drilled in oil or gas saturated bed, in two stages. At first stage water is forced and water loss is measured. At second stage bed fluid is extracted and debits are measured on basis of oil or gas and water, and at both stages pit-face pressure is measured. On basis of measured parameters water level in production is determined, and volumes of extracted and forced water. Type of carbonate collector is determined on basis of dynamics of change of pit pressure at first and second research stages and change of relation of collected volume of extracted water to total volume of forced water during second stage, in time. For better identification of purely cracked and porous collector types, sampling and laboratory research of productive interval core is additionally performed, and results are taken in consideration during identification of carbonate collector type. |
 Deep station for measuring parameters of oil and gas product wells / 2246003Device has measuring tank and tachometer generator and pressure and temperature sensors on it. It is mounted at distance of one tubing pipe from extracting pump, where pressure is higher than saturation pressure, i.e. in one-phase liquid flow, and serves as connecting sleeve. At distance of two tubing pipes from deep station in connection sleeve additionally mounted is sensor of liquid hydrostatic pressure. Measurement of base parameters characterizing production of oil and gas product wells, is performed directly in the well close to position of extracting pump. Device allows to perform systematical measurements of product parameters individually for each product well at all stages of deposit extraction. Use of deep stations for measuring parameters of oil and gas wells product excludes use of expensive and complicated switching execution mechanisms of automated group measuring plants. |
 Method for controlling pressurization of force well / 2246613During recording of pressure change pressure is measured at mouth at tubing column entrance and in inter-tubular space. Recording of pressure change is performed on basis of pressures comparison before and after stopping of well on basis of speed of pressure fall at mouth and in inter-tubular space after stopping of operation well and on basis of pressures comparison before and after well launch for forcing on basis of speed of pressure increase at mouth and in inter-tubular space after well launch. As criterion of pressurization estimation a calculated value of liquid flow, which enters and exits inter-tubular well space is taken. |
 Method for estimation of well cementation quality / 2247236Method includes measuring amplitudes of longitudinal acoustic wave on two working emitted frequencies of signal along casing column within given range. Amplitudes of longitudinal wave of acoustic signal are recorded along column at two frequencies (high Ahf and low Alf) and on basis of relation of these values, normalized by maximal values at portion of non-cemented column Avr (Ahf/Avr and Alf/Avr), separation of cementation defects by major types is performed (ring space, volumetric defect, mixed defect) and values of their openness are measured. |
 Method for analysis of multi-bed wells / 2247237Method includes lowering equipment into well and performing analysis during extraction of oil from oil beds. In accordance to invention after raising down-pumping equipment from the well liquid is replaced with degassed liquid, and research is performed during pumping in of degassed liquid into oil beds and extraction of degassed oil from oil beds, at the same time pumping is performed using exhaust gases under high pressure from moving compressor, and extraction of degassed oil - by letting exhaust gases out of the well. During that on basis of share of oil beds in total debit of product and extraction and on basis of face pressures during extraction and removal bed pressures of oil beds are determined together with their productiveness coefficient. |
FIELD: oil and gas industry.
SUBSTANCE: invention pertains to hydrology, drilling and operation of wells and it can be used for geophysical study of well integrity. Technical result is achieved due to the fact that conventional thermal log system is equipped with thermal anemometer joined with thermal system into united scheme.
EFFECT: expansion of operational functionality due to unambiguous interpretation of thermal log results for cases with temperature anomalies in the well in result of fixed temperature gradients and fluid crossflows.
4 cl, 2 dwg
The invention relates to hydrogeology, drilling and operation of wells and can be used when conducting of geophysical research of the technical condition of wells.
Known technical logging system for the inspection of the technical condition of wells containing thermometer sensing element (...) which is fixed wireline logging, tripping device (SPU), the first secondary equipment, the entrance of which is connected to the ... thermometer, and the Registrar /Patent RF №2166628, cl. 21 47/00, 2001; Patent of the RF №2108457, cl. 21 47/00, 47/10, 1998/.
Any known patents, for example, the latter may be taken as a prototype.
The disadvantages of the prototype are difficulties in interpreting the results of thermal logging, when on thermogram simultaneously temperature anomalies of different physical nature, for example, temperature gradients and fluid flows.
The technical result to be obtained from the implementation of the invention, is the extension of the operational capabilities of the system by unambiguous interpretation of the results of thermal logging for the cases of presence in the borehole temperature anomalies from stationary temperature gradients and fluid flows.
The technical result is achieved by the fact that the famous thermal logging system for the inspection of the technical condition of wells containing thermometer, the sensing element of which is fixed wireline logging, tripping device, the first secondary equipment, the entrance of which is connected to the sensitive element of a thermometer and the Registrar, additionally contains the sensing element of which is fixed at a certain distance from the sensitive element of thermometer from the second secondary equipment, device and the first and second analog-to-digital converters, the outputs of the first and second secondary equipment connected respectively with the first and second analog-to-digital converters for the second and the first inputs device, the output of which is connected to the first input Registrar, to the second input of which is connected the output of the first analog-to-digital Converter.
Temperature-sensitive elements, thermometer and thermo-anemometer fixed wireline logging at the same height as well.
Temperature-sensitive elements, thermometer and thermo-anemometer fixed wireline logging at different altitudes, and the outputs of the first or second secondary equipment connected to the input of the first or second analog-to-digital Converter through the delay line.
The first or the second secondary equipment are made in the form amplifiers coefficients of amplification, and the Registrar and device in the form of a computer.
The invention is illustrated by drawings. Figure 1 shows the block diagram of the system, as in figure 2 - its electronic circuit.
The system is used in 1 well located in it ... 2, 3 thermometer and thermo-anemometer, fixed wireline 4.
... 2, 3 may be the same on their geometrical and thermophysical properties and can be located or at the same height as well 1, or on different altitudes (the latter case the drawings is not shown).
Moving ... 2, 3 along the well 1 is driven by SDA 5.
... 2, 3 outputs are connected to a secondary instruments that can be performed, such as amplifiers, 6, 7 (2), with coefficients of amplification.
In the composition of thermo-anemometer is also heater ... 3, made for example in the form of stabilized power 8-current (detail is not described because of its long-term reputation).
Diagram of the system also contains two analog-to-digital Converter 9, 10 (ADC 9, 10), device 11 (WU 11) and the Registrar 12 made, for example, in the form of a computer.
For the case of location ... 2, 3 thermometer and thermo-anemometer at different altitudes Δh the necessity of the presence in the scheme of the delay line 13 (LPA 13)connected through a system of switches, 14...17 in the circuit of the sensor or thermo-anemometer depending on the direction of their movement (up or down). Tumblers 14...17 can be made in the form of one of the switch the toggle switch with one control knob.
Wiring diagram presented in figure 2.
... 2 through the amplifier 6, toggle switch 16 and ADC 9 is connected to the input of the WU 11. ... 3 through the amplifier 7, toggle switch 17 and ADC 10 is connected to another entrance WU 11.
Outputs ADC 9 and by 11 connected to the inputs of the Registrar 12.
It is easy to notice, that in the presented figure 2 hardware is made for the indirect heating ... 3. There are other cases of implementation of the logging system.
The system works as follows.
Like any instrumentation system is pre-metrological certification of laboratories or factory conditions.
Using amplifiers 6, 7 and stabilized power 8-current is set up and calibration of systems for different temperatures overheating ... 3 thermo-anemometer and velocities U logging.
The system for any velocity U logging is configured to output signal thermo-anemometer was equal to zero. And with the help of amplifiers 6, 7 ... 2, 3 adjusted on the same sensitivity to temperature So Then the appearance of the output signal of thermo-anemometer will indicate the presence of the borehole fluid flows with velocity V.
Depending on the direction you ... 2, 3 LZ 13 using tumblers 14...17 is connected to the circuits of a thermometer or a thermo-anemometer (if in the system there is the case with the location ... 2, 3 at different altitudes).
Time t h a delay in the LA 13 is defined, proceeding from the formula: , where Δh - distance between ... 2, 3.
During system operation ... 2, 3 thermometer and thermo-anemometer fall or rise along or parallel to the axis of the well 1.
With the passage of the areas adjacent to the layers of 14, 15 rocks with other thermophysical properties compared with the background, thermometer will give a signal proportional to the values of the temperature T, different from the background. On curve appears anomalous temperature distribution.
Because of the sensitivity of the sensor and thermo-anemometer to the temperature of the match, then the output thermo-anemometer (exit WU 11) will be zero signal.
When passing zone 16 fluid flows with the speed V at the output of thermo-anemometer appears output signal which is registered by the Registrar 12.
Thus, thermal logging extended in comparison with the prototype. Appeared the possibility of unambiguous interpretation of the results of thermal logging in the case of the presence in the well stationary temperature anomalies and fluid flows.
1. Thermal logging system for survey the technical condition of wells containing thermometer, the sensing element of which is fixed wireline logging, tripping device, the first secondary equipment, the entrance of which is connected to the sensitive element of a thermometer and the Registrar, characterized in that it additionally contains the sensing element of which is fixed at a certain distance from the sensitive element of thermometer from the second secondary equipment, device and the first and second analog-to-digital converters, the outputs of the first and second secondary equipment connected respectively with the first and second analog-to-digital converters for the second and the first inputs device, the output of which is connected to the first input of the Registrar, to the second input of which is connected the output of the first analog-to-digital Converter.
2. Thermal logging system according to claim 1, wherein the heat-sensitive elements of thermometer and thermo-anemometer fixed wireline logging at the same height as well.
3. Thermal logging system according to claim 1, wherein the heat-sensitive elements of thermometer and thermo-anemometer fixed wireline logging at different altitudes, and the outputs of the first or second secondary equipment connected to the input of the first or second analog-to-digital Converter through the delay line.
4. Thermal logging system according to claim 1, wherein the first or the second secondary equipment are made in the form of amplifiers with reduced coefficients of amplification, and the Registrar and device in the form of a computer.