Method for determination of product water cut in oil producing well. RU patent 2520251.
 Methods and device for planning and dynamic update of sampling operations during drilling in underground formation / 2502870Method involves identification of a variety of processes and their parameters; with that, processes include drilling and sampling processes and parameters include drilling and sampling parameters. Also, the method involves processing of parameters for each of the processes by means of a special modelling processor creating forecasts related to formation sampling. With that, special modelling processor includes at least one of simulators of a well shaft hydraulic system, a simulator of filter cake of drilling mud, a simulator of formation stream or a simulator of tool feedback. The method also involves classification of forecasts related to formation sampling based on at least one of sample fluid medium quality, duration of sampling process, productivity of sampling process or cost of sampling, and planning of sampling operation based on classified forecasts. |
 Device for sampling of liquid from pipeline / 2496101Device includes sampling tube mounted in pipeline perpendicular to flow movement and provided with slot-like inlet from side of flow movement. Slots in inlet are made horizontally along the height of pipeline and are directed toward liquid flow. Depth of slots changes from small near pipeline walls to largest near pipeline axis. Opposite to inlet in sampling tube there made is a vertical slot. |
 Method for determining nature of inter-string gas shows of wells of multiformation oil-and-gas condensate deposits / 2494251In addition, analysis of isotopic composition of carbon of sum of hydrocarbons C2-C6 is performed and limits of values of isotopic composition of carbon, methane and isotopic composition of carbon of sum of hydrocarbons C2-C6 for reference horizons are determined. Tables and/or graphs represent ranges of values of isotopic composition of gases from reference horizons and gases are represented from inter-string space of wells or drilling fluid; as per the degree of similarity or coincidence of the above ranges of those values (or individual points) there evaluated is nature of investigated inter-string gas shows. |
 Geochemical survey of natural gas production from low-permeability gas fields / 2493366Method for assessing a gas-recovery ratio for the volume drained by at least one productive gas well comprises: calibration of the changes of an isotopic composition of at least one component of the natural gas recovered from the gas well with the gas-recovery ratio gain. Sampling of the natural gas recovered from the production well, and analysis of the sample for preparing the isotopic composition of the component of the natural gas. Use of the previous calibration and the specific isotopic composition for assessing the gas-recovery ratio for the volume drained by the gas well. Use of the assessed gas-recovery ratio and total volume of the natural gas produced from the gas well to determine the volume drained by the gas well. |
 Method to investigate beds in process of oil and gas wells drilling and sampler for its realisation / 2492323In process of sampling, values of specific electric conductivity are measured on liquid arriving into a sampling chamber. At the same time measured values of specific electric conductivity and readings of pressure and temperature sensors are recorded with a surface receiving-processing station, and to form a channel of communication with it and to provide for sampler lowering and lifting, an armoured geophysical cable is used, which is withdrawn from a drilling string via a sealing device. Besides, before opening of a potentially producing bed, the sampler at the vibration and impact safe distance from a bit is fixed on the cable in the above-packer space of the above-bit packering unit, providing for direct circulation of the mud. And after opening the sampling operation is carried out by means of multiple sampling and remote express-analysis of fluid composition in every sample according to specific electric conductivity, for this purpose the chamber by means of piston displacement is released from the first sample with fluid discharge into the above-packer space. Then it is put into the initial working condition, and similarly to the first sample taking, further sampling is carried out, until extremum of specific electric conductivity values is achieved, and on the basis of this parameter, a decision is made to lift the last sample from the well or to continue drilling process, and bed parameters are identified on the basis of pressure, temperature sensor readings, and by the value and speed of increments of specific electric conductivity. |
 Method for downhole sample control / 2490451Method includes taking of a downhole sample by a sampler and its transportation to the surface. At that at the surface the sealed sampled chamber is set in different positions under vertical angles less than 180 degrees and measurements of the fluid are made by primary detectors installed inside the chamber on the surface of a dividing piston; then content of the downhole sample is analysed and calculated. |
 Calculation method of ratio of relative permeabilities of formation fluid media and wetting ability of formation, and tool for formation testing to implement above described method / 2479716Method and tool that implements the method involving the measurement of viscosities and flow rates of fluid media of the formation and obtainment of the ratio of relative permeabilities of formation fluid media and formation wetting ability using those viscosities and flow rates of the formation fluid media. |
 Methods and device for analysis of composition gradients at bottomhole, and their use / 2478955Invention relates to the method and system for obtaining characteristics of the composition gradients and fluid medium properties of the involved header, and analysis of the header properties based on such gradients. |
 Device for sampling deep wells / 2470152Invention relates to sampling of deep wells. Proposed device comprises suction-type sample intake chamber with separation piston, check valve and check valve seat, ballast chamber with pressure regulator, sample pressurisation mechanism with compressed gas chamber, pressurisation fluid chamber and pressurisation piston, control and data exchange module, sample input channel and valve. Said sample pressurisation mechanism is arranged between sample intake chamber and ballast chamber, and equipped with uncoupler with piston and holder. Note here that sample intake chamber is provided with extra moving piston with check valve. |
 Bed fluid sampler / 2465457Proposed sampler consists of fluid sampling system. Said system includes fluid sample taking and keeping valve, logical hydroelectric system for sampler locking and unlocking in well. Said system comprises motor connected to pump coupled with first distributor via first check valve, filter, safety valve and second distributor connected to tank, fluid sample taking and keeping valve, first, second and third pressure transducers. Note also that first distributor is connected to head ends of first, second and third hydraulic cylinders. Rod end of the latter are connected to third distributor connected with throttle and accumulator with fifth pressure transducer. In compliance with this invention, added fluid sampling rate control system comprises storage chamber connected with sixth check valve, fourth hydraulic cylinder via seventh check valve and proportional fluid flow rate regulator while sampling valve is connected with second, third, fourth, fifth and sixth check valves. Note also that fourth hydraulic cylinder, proportional flow rate regulator, fourth and fifth check valves are connected with the tank. |
 Device to determine water production intervals and to isolate them in boreholes of multihole horizontal wells / 2514009Device comprises the going-in string of hollow sealed pipes and logging instrument for well survey. Flow string used as said going-in string of hollow sealed pipes has bottom end with openings to accommodate blown valves while inner circular groove is made under holes in said flow string to receive split lock ring. Note here that hydraulic standoff device is arranged at bottom end of said flow string for it to get into open well of multihole horizontal well. Besides, this device is equipped with squeezing plug to slide over flow string, driven by fluid overpressure to destruct blown valves for opening of holes in flow string and locking by lock ring in said string under said holes. Logging instrument is lowered into flow string by stiff cable against the stop to squeezing plug. |
 Procedure for survey of multi-hole horizontal well / 2513961Invention suggests procedure for survey of the multi-hole horizontal well that includes stages of bottomhole apparatus running-in to the well, performance of hydrodynamic research and removal of a geophysical tool from the multi-hole horizontal well. At that, before bottomhole apparatus running-in, at the head of the multi-hole horizontal well a hydraulic whipstock with drill out breakable cap, metering orifice and fixing breaking pin is installed at the lower end of the pipe string. The pipe string with the hydraulic whipstock is run in with simultaneous washing up to space of the surveyed side-tracking. Herewith in process of running-in the pipe string is equipped with kick-off valves. Then excess hydraulic pressure is created in the pipe string and the string is run in into the surveyed offshoot and excess pressure in the pipe string is increased till the breaking pin is destructed and the breakable cap is disconnected from the hydraulic whipstock. Then at the well head the bottomhole apparatus is connected to a rigid cable and the apparatus is run in into the pipe string until it leaves the string and appears in the offshoot. Thereafter fluid influx is stimulated from the stratum by gas injection to tubing-casing annulus through kick-off valves and hydrodynamic research is carried out in the surveyed offshoot by the bottomhole apparatus pushing up to the bottomhole. After hydrodynamic research the rigid cable with bottomhole apparatus from the pipe string and the pipe string with hydraulic whipstock are removed in sequence. |
 Method for determination of residual gas content in fluid / 2513892Invention refers to oil producing industry. The method includes procedures for measurement of initial gas content in the fluid and of the volume of gas released from the fluid. At that initial gas content in the fluid is determined for each group of oil producing wells operated in the common pipeline. Remaining gas content in the pipeline liquid is determined after gas extraction from skim pile according to the following formula: G = ∑ i = 1 n ( G i ⋅ Q i ) − Q g ∑ i = 1 n Q i , where Gi is initial gas content in the fluid in the i well; Qi - liquid rate for the i well; n is a number of wells in the group operated in the common pipeline; Qg is volume of gas released from the pipeline liquid in skim pile per a time unit. |
 Oil well gauging device / 2513891Device consists of a vertical cylindrical vessel, input and output liquid lines made in the form of siphon pipe, a gas line, gas-phase pressure and temperature gauges, a computing element. Volume displacement metre and a stop valve are installed in the common line, one by another, before the line entry into the collecting reservoir, at that the gas line and the output liquid line connected by downward siphon pipe are communicated with hydraulic lock. Pressure and temperature gauges are installed in the gas line; the stop valve, the volume displacement metre and the computing element are interconnected through a pulse distributer for measurement of the working medium. The stop valve is a bypass valve of step-by-step action with magnetic locking, discharge and control of positions - open and closed. |
 Method for determining behind-casing flows / 2510457As per the proposed method a well is equipped with a pipe string with a swab. The string bottom is arranged below perforated interval of a productive formation. The well is equipped with a bottomhole thermometer on a cable in annular space. The swab is lifted via the pipe string and at the same time, the bottomhole thermometer in a recording mode is lifted via the annular space on the cable. During the swab lifting there is the change of liquid flow direction in the well from direction from the productive formation in an upward direction of the well at oil production, for direction from the productive formation in a downward direction to the pipe string column. Operations are repeated; thermograms are recorded at the changed direction of well fluid flow; thermograms are analysed and compared to the thermogram of the killed well. On thermograms at the changed direction of well fluid flow there indicated is rise of temperature at the investigated interval. It is assumed that behind-the-casing flows are available in a downward direction from overlying to underlying formations. A conclusion is made on flow of the fluid from the overlying formation in the direction of behind-the-casing flows to the perforated interval. |
 Thermal log system for well integrity study / 2506424Invention 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. |
 Method for determination of influx profile and borehole environment parameters in multilay well / 2505672Well production rate is changed and temperature is measured during certain time period for fluid flowing to the well from each layer; temperature variation value ΔTP is measured for initial stage and steady-state value A of temperature-time logarithmic derivative is calculated for each layer. Specific yield value q for each layer is determined against the specified mathematical expression. Yield Q for each layer of the well is determined and influx profile is defined as totality of yields Q for all layers. |
 Method of defining oil associated gas and water discharge / 2504653Proposed method comprises filling measuring tank with well product via inlet valve to maximum level With water-oil mix reaching maximum level, tank inlet valve is closed to let free gas to escape from fluid. Water-oil mix discharge is defined by the rate of tank filling the volume of separated fluid. Inlet valve is opened to displace the product from tank into manifold for time interval equal to previous period of tank filling with well product. Gas is gradually derived and forced into manifold by compressor. Gas bleeding is performed via pressure control valve at compressor inlet to atmospheric magnitude. Associated gas discharge is defined by compressor output, time of pressure decrease in calibrated vessel to atmospheric values and volume of vessel filled at the time with gas phase. |
 Method of analysing productivity of inclined well that exposed productive bed / 2504652Set of inventions can be used in geophysical and hydrodynamic research. It allows estimating the productivity of gas wells exposing the productive isotropic bed at preset zenith angle and optimising their structure. |
 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. |
 Dual string production method in well with increased gas ratio and device for its implementation / 2513566Group of inventions relates to split-stream production of several formations with use of a sucker-rod pumping unit. The method includes running of the unit including a flow column, a liner-packer combination ensuring splitting of the upper and the lower operated formations, sucker-rod pump for formation fluid pumping from two formations which inputs communicate with the over-packer and the under-packer space through suction valves while its output communicates with a cavity of the flow column through an injection valve; a transition element providing hydraulic connection of the under-packer space through the liner to one of suction valves of the sucker-rod pump and permanent separation of associated gas from the fluid produced from the lower formation to the in-field flow line at the well head or to the over-packer cavity of the well above dynamic level through the borehole pipeline. After separation of associated gas the formation fluid is pumped from two formations through the flow column at the well head. |
FIELD: oil and gas industry.
SUBSTANCE: determination is carried out in a well equipped with a tubing string with an electric-centrifugal pump and a return valve at the end. In order to determine water cut the well is selected in the middle of an oil deposit with production modes close to the average values for the deposit. The well is operated not less than the time required to reach full operation. The well is stopped and process holding is made till gas separation from the well product and breakage into oil and water. Height of the liquid column is measured, volume of the water cut is determined against the boundary line of liquid and gas and water and oil.
EFFECT: improving accuracy of the water cut determination in the well.
The invention relates to the oil industry and may be applied in the determination of water production of the oil wells
There is a method to determine the water content of fluid in the production of oil wells, namely, that a representative sample of the fluid contained in a vertical cylindrical vessel, lead by settling, processing chemicals and heat to the state, at least, incomplete bundle for oil and water. Measure the height of the liquid column, hydrostatic pressure, and then in the process of emptying of the vessel produce continuous measurement of hydrostatic pressure and height of the liquid column. The density of water and oil in the composition of the liquid determined by dividing the difference between the maximum and current changes of hydrostatic pressure and the corresponding difference in height of the liquid column in the beginning and the end of discharge. Accumulate the data array. Build a graph of the dependence of the density, and pour out the liquid from the height of the pillar or to the time of discharge. Choose in between the top and bottom horizontal line sections density respectively water and oil. On the chosen values of the densities of the oil and water determine the mass cut production wells. The technical result is the simplification of the sizing algorithm densities of water and oil in the composition of production wells, improving the accuracy of measurements of high and low water cut in production wells (RF patent №2396427, publ. 10.08.2010)
The closest to the proposed invention of the technical nature is a way of measuring the rate of production of oil wells in systems sealed collection, in which the measuring container (S) calibrated volume after purging production wells (PS) fill partially separated PS during the pre-assigned with the maximum performance time at the open on a collector of gas and closed drain fluid lines. After the appointed time of the receipt of the COP in THEIR stop. Partially separated PS contained in the tank level gauge S, process chemicals, heated and maintained to the state stratification into oil and water. Then measure the height of the liquid column, hydrostatic pressure (GDM) and temperature. Calculate performance liquid. Then on interposition of dividing lines environments liquid - gas and water - oil judge volume is watering. The mass ratio of water - oil determine, using the values of the density of water, measured in the tank level gauge S, and the density of oil. Thus take into account the amount of fluid that remains in the system of the separator - S after her "blow-in" PS before beginning the procedure of measurement. Then simultaneously with the closing of the gas and the opening of liquid lines on the reservoir resume the flow of PS in IE; determine the speed emptying and THEIR excessive pressure, make the calculation of productivity. The density of water define to the full withdrawal of water from the tank level gauge during emptying after the resumption of receipt of the COP in THEIR by dividing the difference GDM column of liquid in the tank level gauge before and after the leaving of part of the water column on the difference between appropriate levels of the liquid column. And the density of the oil is determined after the full withdrawal of water from the tank level gauge during emptying after the resumption of receipt of the COP in THEIR by dividing the value of GDM, remaining at the time of measurement of the liquid column, on its height (RF patent №2299322, publ. 20.05.2007 - prototype).
The General lack of known technical solutions is a low accuracy of flooding, caused by movement of the production wells in measuring capacity.
In the proposed invention solves the problem of improving the accuracy of water cut in production wells.
The task is solved in that way to determine the water content of the products of the oil wells, including separation from production wells gas, conducting exposure to the state of stratification into oil and water, measuring the height of the pillar, on interposition of dividing lines environments liquid - gas and water - oil determination of the volume values of flooding, according to the invention the definition of conduct in the well that supplied column of pump-compressor pipes with electric centrifugal pump and non-return valve on the end, to define watering choose a well located near the middle of the oil reserves, with profiles production close to the average reservoir, well exploited least the time of an exit for operating conditions, and before separation from production wells gas and exposure to a state of splitting into oil and water to stop it well and hold the technological holding.
Summary of the invention
The accuracy of determination of water production (oil) wells is one of the most important tasks in the development control object, determining the profitability of well operation, the assessment of the effectiveness of the technologies of enhanced oil recovery.
At achievement of the values of the water content in the 98-99% frequently adopted a decision to stop wells (translated in an inactive or not operational Fund) or the overlying formations. However, existing technologies to determine the water content - sampling on the mouth wells volume in the first hundred milliliters, do not give full confidence in its reliability. Error of 2-3% in prolific, highly watered Fund can dramatically change the assessment of profitability of well operation.
To improve the reliability of determination of the water content of products produced definition of conduct in wells, where the deep-pumping equipment used electrical submersible pump, launched the tubing pipes, equipped with a check valve. The technology involves determining the water content directly into the well without extraction deep-pumping equipment and a Wake-up liquid on the surface.
The definition of conduct in the well that supplied column of pump-compressor pipes with electric centrifugal pump and non-return valve on the end. To define watering choose a well located near the middle of the oil reserves, with modes of production, close to the average reservoir (differ no more than 15%). Well exploited least the time of an exit for operating conditions. Well stop and closing valves cut from the pipeline, while a non-return valve prevents the flow of liquid from the column of pump-compressor pipes into the well. The result is cut off vessel - the inner cavity of the column of pump-compressor pipes, equal to the volume of 2-3 m 3 , which is several thousand times higher than the volume of standard samples. This cut off the vessel has strongly extended almost vertical form, which increases the efficiency of gravity separation of gas-liquid mixture.
After stopping the well kept for the time required for gravity separation of phases (gas-oil-water). In this period the discharged gas release through force feed valve. Time is determined empirically given temperature of products produced, the water content in the initial stage of organization of this work is specified by sampling in the oil cap with the use of deep samplers. Also for the improvement of the phase separation process through rings, valve can add oil soluble demulsifier. Then through rings, valve descending into the tubing pipes resistivity meter, moisture meter, or other similar instrument fix the level of liquid and oil-water partition. Calculate the height of the oil cap and its relation to the height of the liquid column in the tubing pipes determine the volume fraction of oil and, accordingly, expect production watercut:
W volumetric = 1-h oil/h of liquid (%)
Using a pressure gauge in the complex with hygrometer also allows to calculate the density of oil "hats" and, accordingly, to confirm the completeness of the separation of phases.
A specific example
Well # 1387 Aktashskaya area, Novo-elkhovskoye field is located in the middle of the oil reserves, with modes of production, close to the average reservoir: the rate of 80 m 3 /day, bottom-hole pressure 11,7 MPa. Well exploit 30 days, i.e. at least the time of an exit for operating conditions. The well produces oil with KIROVSKOGO and pashian horizons using the following deep-pumping equipment - electrical submersible pump ACNM-60-1200 lowered to a depth of 1400 meters on the tubing pipes with a diameter of 73 mm Over electric centrifugal pump check valve. Before stopping the well through the sampler select a control sample, which showed a cut of 100%. Well stop, conduct technological holding during the day and produce a study on water cut. Received the following data: liquid level - 264,5 m, water-oil section 288 meters i.e. oil "cap" is 23.5 m in liquid column in the column of pump-compressor pipes - 1135,5 m (1400-264,5 m). Thus, the cut makes 97.9%. The efficiency of the separation confirmed as the samples selected in-depth sampler with two points in the oil "cap" (watering of 0.75% and 0.3%), and the readings of manometer (pressure at the oil-water section was 0.2 MPa, which corresponds to the density of 23.5 m oil caps in 0,85 g/cm 3 , i.e. oil).
Thus, the proposed method allows to determine the water content of more precise than the known.
Application of the proposed method will allow to solve the problem of improving the accuracy of water cut in production wells.
Method of determination of water production of the oil wells, including separation from production wells gas, conducting exposure to the state of stratification into oil and water, measuring the height of the pillar, on interposition of dividing lines environments liquid - gas and water - oil determination of the volume values watering, wherein the definition of conduct in the well that supplied column of pump-compressor pipes with electric centrifugal pump and non-return valve on the end, to define watering choose a well, located in the district the middle of the oil reserves, with modes of production, close to the average reservoir, well exploited least the time of an exit for operating conditions, and before separation from production wells gas and exposure to a state of splitting into oil and water to stop it well and hold the technological holding.