Increasing productivity of production wells

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method consists in application of wave dilation technology. Note here that operation of pumping units in wells is synchronised, said units being equipped with wave dilation effects promoters. To ensure said synchronisation, downhole hardware is furnished with sensors for registration of elastic vibrations and channels for transmission of received signal to the surface at pumping unit operation control board. Note also that synchronisation of every pumping unit in the field is effected in frequency of signal generated pumping unit of master well.

EFFECT: higher efficiency of extraction and oil yield.


The invention relates to the field of oil and gas industry, namely wave technology combined effects on reservoirs to enhance hydrocarbon recovery.

A known method of wave action on the discovery of hydrocarbons (RF Patent No. 2361070, IPC E21B 43/16, publ. 10.07.2009). On the surface in a vertical and/or inclined and/or horizontal and/or branched wells place the sources of wave vibrations, created with the help of sources of wave vibrations simultaneously longitudinal and transverse waves, with which the wave impact on the environment with the hydrocarbon, the interference wave fields with the fronts set configuration formed by excitation of longitudinal and transverse waves at the points of hydrocarbon deposits with time delays proportional to the distance from the point of excitation waves to each given point deposits.

The closest in technical essence and the achieved result is technology dilatation wave action (patent No. 2261984), which is well proven in its application to individual focal wells.

The disadvantage of this technical solution is that when you try to implement this technology in several wells in one part of the oil spot is of an unforgettable positive result was not achieved. The expected increase of oil produced from each of the wells, which was implemented this technology, could not be obtained. Moreover, instead of the expected total gain from all wells, where it was installed and running their equipment DWI, additional production was much less than the expected value.

Analysis of the causes of this phenomenon showed that sucker-rod pumping units, which were equipped with focal wells for DWI, operating asynchronously, stir in the reservoir elastic waves are shifted relative to each other in phase, which ultimately leads to their out-of-phase interference and effectively nullifies the effect of the distribution in the layer of elastic waves excited by the technology DWI.

Because dilatational elastic waves propagate in the reservoir from each installation asynchronously, the time of their positive interference may occur anywhere in the field, not even matching with production well, which leads to uncontrolled "wandering" maximum dilatational effect on its area.

Object of the invention is to provide ingress doubled or even trebled) peak amplitude at positive interference in a location separate production well. This requires that the drive each pump unit began to operate synchronously with the frequency of the received signal from him specific setting rod installation located at a particular point in the field.

The problem is solved in that in the method of increasing the productivity of producing wells based on the use of technology dilatation wave impact, according to the invention in-depth equipment wells equipped with sensors recording of elastic waves and transmission channels of a received signal on the surface. On the surface is provided to synchronize the operation of the pumping unit with the frequency of the signal generated by the machine-rocking sets well.

The method is as follows. In the Central area of the field one of the production wells are equipped with the appropriate depth equipment to provide the dilatation wave action on a productive stratum. Elastic waves generated in the borehole with a frequency equal to the frequency of the pumping unit, begin to spread from a given focal wells along the layer in all directions and gradually reach the neighboring wells have similar dilatation wave equipment.

As the elastic oscillations of the corresponding neighboring wells they are captured by the sensor reception of elastic waves, located at its deepest equipment, amplified and transmitted to the surface via a wireless communication channel in the Cabinet councils is possible by operation of the pumping unit, the actuator which is synchronized to the received signal and actuates the machine-rocking with the oscillation frequency corresponding to the frequency of the received oscillations.

This ensures synchronization of all other pumping units located on the field at some distance from the focal sets of the well.

Elastic oscillations with the frequency specified by the machine-rocking focal wells, spreading, productive stratum, capture their influence more and more wells equipped with machines-rocking chairs, similar to the phenomenon, similar to the "chain reaction", when each subsequent hole becomes similar to the first focal wells.

All wells start to run synchronously with the frequency of the first sets of wells. Such synchronous operation causes a positive interference of waves propagating along the layer, the consequence of which is doubling and even tripling the amplitude of elastic waves in the reservoir and especially in the critical zone of each well, which will increase its productivity. The more will increase the amplitude of the elastic waves, the greater the increase in productivity.

The way to increase the productivity of producing wells based on the use of technology dilatation wave impacts the via, notable deep equipment wells equipped with sensors recording of elastic waves and transmission channels of a received signal to the surface where it is provided to synchronize the operation of the pumping unit, which are installed in each well, with the frequency of the signal generated by the machine-rocking sets well.


Same patents:

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used at exploration of northern deposits and at control over heat-isolation capacity of well structure, contact of permafrost strata thawing halos at adjacent wells of developed deposit cluster. Thermal and physical conditions at wells are determined at two adjacent walls with subsiding permafrost strata that can cause problems at their thawing. Note here that thermometer instruments are arranged in every well behind the outer case strings for temperature measurement in well string space nearby permafrost stratum and at wellhead for fluid temperature registration inside every well at first and second time moments for every well. Said time moments are counted down from the start of well operation to start of permafrost stratum thawing there around. Measures temperatures and time of thawing start are introduced into expressions used to define the empirical factor dependent on stratum heat conductivity. Rime-variable radii of thawing zones and width of through thawed fracture are compared with their actual values measured at gas penetration to forecast the well conditions.

EFFECT: intensified oil production.

1 tbl, 1 dwg

FIELD: engines and pumps.

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3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises determination of drilling mud rheological properties, drilling mud filtrate and formation fluid, measurement of outer filtration crust, porosity and permeability of core specimen. Note here that mathematical model of said outer filtration crust if constructed. Drilling mud is forced through core specimen to register pressure drop dynamics at specimen and flow rate of effusing fluid. Micro tomography is used to define the profile of drilling mud solid particles penetrated into said specimen. Mathematical model of inner filtration crust is constructed to describe the dynamics of drilling mud particle concentration in threshold space of core specimen and associated changes in core specimen permeability. Enchained mathematical model of inner and outer filtration crusts is constructed. The latter allows the determination of parameters of inner filtration crust mathematical model whereat reproduced are experimental; data on pumping said drilling mud through core specimen and profile of drilling mud solid particles penetrated into said specimen.

EFFECT: higher accuracy and lower labour input.

1 cl, 8 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: well production at mixing of two well products by preliminary sampling of every productive seam with determination of reference component, subsequent sampling of representative product and determination of desired production quantity for every seam by computation. Note here that said reference component for differentiation of extracted oil and formation waters represents an arbitrary stable reference component including total content of definite (particular) hydrocarbons in extracted products the content of which differs notably for oils, while differentiation of formation fluids is executed by stable reference component, that is, total mineralisation. Formation fluid total mineralisation is evaluated after its complete removal from mouth sample with subsequent water evaporation from standard weight, dry residue is weighed and dissolved in distilled water. Mechanical impurities not dissolved therein are separated the weight of which are not allowed for in determination of total water mineralisation.

EFFECT: higher accuracy.

2 dwg

FIELD: mining.

SUBSTANCE: invention relates to drill bits. Brill bit comprises body with at least one gaging plate and set of accelerometers. Said set comprises radial and tangential accelerometers for determination of radial and tangential acceleration of drill bit. It includes data analysis module incorporating processor, memory and communication port. This module is designed to fulfil the jobs that follow. Sampling the data on acceleration from accelerometers during the analysis. Loading said data to memory to get the acceleration time history. Analysis of acceleration time history for determination of distance made by at least one gaging plate. Analysis of acceleration time history for determination of at least one plate cutting period and at least one plate sliding period. Evaluation of gaging plate wear proceeding from determination of distance made by at least one gaging plate and at least one sliding period. In compliance with proposed method, data is collected from accelerometers by periodic sampling of data from at least two accelerometers arranged in drill bit to get acceleration time history during the analysis. Acceleration time history data is processed for determination of profile of distance made by at least one gaging plate. Rock current hardness is defined for analysis of the profile of distance made by at least one gaging plate. Now, current rock hardness is defined to evaluate the gaging plate wear.

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14 cl, 13 dwg

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics. The method comprises determining fracture porosity and calculating resistivity at different depths of the fractured reservoir based on full diameter core data and imaging logging data; creating a percolation network model of matrix and fracture combination with known pore structure features; calibrating the numerical simulation results according to the percolation network model based on the data of a core experiment and sealed core analysis results, then obtaining the relationship between the resistivity (I) and water saturation (Sw) at different fracture porosity; calculating hydrocarbon saturation of the fractured reservoir by selecting an interpolation function.

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10 cl, 3 dwg

FIELD: mining.

SUBSTANCE: proposed device comprises housing to accommodate the set of pressure and temperature gages, moisture metre and flow metre, electronics unit connected by logging cable, on one side, with surface control station and. On opposite side, with said gages, coupling unit with cable joint head and centring skid. Instrumentation module is secured at said housing by leverage, said module including inclination metre and extra gages, at least, moisture metre and flow metre connected with electronics unit. This module can reciprocate along the gravity vector between casing pipe and housing. It is located at casing pipe profile lower part by centring skid and coupling unit. It is equipped with housing turn drive and instrumentation module to turn them from gravity vector set by inclination metre via electronic unit.

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4 cl, 3 dwg

FIELD: mining.

SUBSTANCE: proposed method comprises the steps whereat well data is generated as an electromagnetic signal to ne radiated by radiator to receive telemetry info as the electromagnetic signal. Note here that said telemetry info is received by cable antenna with negative buoyancy. Note also that cable antenna comprises active two-electrode section and symmetric feeder composed by twisted pair of wires. Note that feeder length is selected to be at least sea depth at the point of submersion of cable antenna on shelf. Besides, signal received by antenna can be amplified by amplifier incorporated with said antenna and arranged between active two-electrode section and symmetric feeder. Additionally, received signal is filtered by rejection filter incorporated with cable antenna between two-electrode section and amplifier.

EFFECT: higher reliability, sensitivity, lower power potential of electromagnetic channel of telemetry data transmission.

3 cl, 2 dwg

FIELD: oil and gas industry.

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4 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method for integral status assessment of bottomhole formation zone includes operation of the well in steady conditions before hydrodynamic research, hydrodynamic research by repressuring method, determination of bottomhole pressure and continued fluid influx to the well from formation after its shutdown and processing of measurement results. At that during processing of measurement results current formation pressure is determined by multiplication method, approximation of the measurement results is made including division of actual pressure buildup curve (APBC) into separate sections at coefficient of determination less than 0.99. Then selection of approximate equations is made for the selected sections and division of the whole research period into intervals with uniform time increments. Values of bottomhole pressure are calculated for the specified intervals. The approximated APBC is processed by determined pressure moments with determination of formation pressure and nondimensional diagnostic property. The obtained formation pressure is compared with the pressure obtained by multiplication method. When the values differ per more than 0.3 MPa, approximation procedure shall be made with use of other approximate equations. Then against results of formation pressure determination by multiplication method the degree of bottomhole pressure buildup is assessed and well production index is determined for the conditions. In order to specify position of the processed section the log-log plot is plotted. The actual and approximated APBC is processed by tangent method with determination of parameters for the remote formation section. The results of actual and approximated APBC processing by tangent method are compared. When permeability coefficients for the remote formation section are different as related to actual and approximated curves, then approximation procedure is performed with use of other approximate equations. Then skin factor is determined for APBC with almost full pressure buildup, at least equal to 99%, and for APBC without pressure buildup. Status of the bottomhole formation zone is assessed against values of diagnostic property and skin factor. When APBC cannot be processed by tangent method, processing is made by differential or integral methods considering influx after the operations, with preliminary made procedure of approximate buildup curves for equidistant time values. Parameters are determined for the remote formation zone using several methods considering influx after the operations, in case of their status deterioration dimensions and properties of the remote formation zone are determined using permeability values determiner at earlier stage for the remote formation zone. Status of the bottomhole and remote formation zones is assessed against values of diagnostic property, permeability, hydraulic conductivity, piezoconductivity and dimensions of the bottomhole formation zone.

EFFECT: improving determination accuracy for indices characterising status of the bottomhole formation zone.

11 dwg

FIELD: physics, acoustics.

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1 dwg

FIELD: oil-and-gas industry.

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EFFECT: higher efficiency.

2 dwg

FIELD: oil-and-gas industry.

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17 cl, 8 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used for improvement of oil reservoir performances at various stages by bringing the direct effects on deposit of resilient mechanical oscillations of preset intensity and frequency. It increases the efficiency of mechanical effects and drive life and decreases the power consumption. Vibroexciter drive comprises housing with feed and discharge channels, reactive-type drive rotor made of cermet fitted on commutator-shaft running in bearings fitted on the drive housing, replaceable inserts from cermet provided with calibrated orifice in its axis and temporary plug with the seat for said insert.

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3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises control over crude oil phase state. To prevent formation of solid phase in crude oil with paraffinic sediments, first, saturation of crude oil with paraffins is defined with due allowance for saturation temperature of degassed oil and content of paraffins. Influence of pressure and amount of gas dissolved in oil is evaluated under reservoir conditions with allowance for current seam pressure and crude oil gas content. Deposit operation conditions are set when seam pressure and pressure of oil saturation with gas are similar or equal while paraffins in oil are saturated or close thereto. At content of paraffins of 0.5-2 wt % in seam oil operation conditions are selected at seam oil extraction with pressure compensation by injection of cold water. Note that seam pressure is not decreased below initial pressure and phase state of seam oil with paraffins is not disturbed.

EFFECT: higher efficiency of the process.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the field of oil and gas wells treatment. More specifically, the present invention is oriented towards development of the system and alternatives of the method to remove fluids from oil and/or gas wells. It improves efficiency of fluid extraction from the borehole and reliability of applied means. The concept of the invention is as follows: one of the inventions - the system includes a pressure pipeline, an injector valve, a pressure relief valve, a cylinder, the cylinder valve, a return pipeline valve and a return valve. The above components are installed in the underground well in order to remove at least one fluid from the well. Fluid removal from the well is controlled by regulation of gas delivery to the pressure pipeline.

EFFECT: improvement of hydrocarbon production and recovery factor from the underground strata.

10 cl, 7 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to underground hydrocarbon inflow stimulation and more specifically to devices improving reliability of point stimulation. Essence of inventions: the invention envisaged pumping of liquid through a stimulator, bypassing of at least a part of the liquid through the stimulator, bypassing of at least a part of the liquid from the stimulator to an anchor unit connected to it so that they can communicate. At that the anchor unit includes housing with a movable former and a one-way restrictor movable inside the former. The one-way restrictor inside the former can be placed to the first position in which the restrictor passes a limited amount of the liquid through the housing. The liquid can be also introduced from the anchor unit in order to install a sand plug at the predefined position and to divert the liquid flow in this position by means of a sand plug.

EFFECT: higher efficiency of stimulation and operating reliability of the devices.

19 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes running-in of a pipe string into the bed perforation interval, flushing of the well equipped with the master and casing valves, treatment of the bottomhole zone by injection of a hydrochloric acid solution through the pipe string and a process holdup for reaction. According to the invention the pipe string is equipped by an impulse pulsator from below and by a valve above the impulse pulsator. The pipe string is run in into the well so that the lower end of the pipe string is located opposite the bed perforation interval, fresh water with addition of a surface active compound (SAC) is injected into the bed in a pulsed mode closing the casing valve under pressure that does not exceed permitted pressure to production casing with further spill and recovery of direct circulation. Then the valve is actuated and the impulse pulsator is cut off, the pipe string is run in additionally so that radial openings of the valve are located opposite the bed perforation interval. The hydrochloric acid solution is pumped through the pipe string until it reaches the bed perforation interval, a hydrochloric bath is set and the well is held. During the process holdup fresh water with SAC addition is injected each half an hour in sequence to the pipe string and a tubular annulus. After the holdup completion the reaction products are flushed from the well. An actual bed intake is determined by injection of fresh water with SAC to the bed through the tubing-casing annulus under pressure that does not exceed the permitted pressure to the production casing. If the actual bed intake is bigger or equal to the optimal intake then treatment of the bottomhole zone is stopped and the pipe string is run out from the well. If the actual bed intake is less than the optimal intake then at the open master and casing valves return circulation of the fluid is induced and the well is flushed. At that the master valve is closed periodically till the bottomhole pressure increases per 4 MPa from the initial value with further opening of the master valve till a transparent fluid appears. At that permitted pressure for production string is not exceeded. Return circulation is continued within 1 hour and then the actual bed intake is determined again.

EFFECT: improvement in efficiency of the bed treatment due to increase of the bed intake before its treatment, simplification of the method, reduction of costs and time of the bed treatment.

1 ex, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: vertical injector and a horizontal producer are drilled, working fluid is injected to the injector and the product is extracted from the producer. A horizontal section of the producer is left uncased and placed above the oil-water level - in the middle interval of the oil saturated zone of the deposit. The injector is constructed till the oil saturated zone of the deposit is opened at the distance from the producer bottomhole that excludes breakthrough of the working fluid to the producer. In the producer a process pipe is installed that consists of in-series perforated nozzles with centralisers and water-swelling packers placed in-between so that they can close a tubular annulus hermetically if water content in the product exceeds 50%. During operation of the producer when the product is watered up to 90-95% the process pipe is cut off from the bottomhole opposite the respective packers.

EFFECT: improving production rate of the deposit, efficiency of oil displacement, increasing coverage area by the displacement agent due to its consistent workout, reducing water-content in the product.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: during development of oil pool at least a part of wells with horizontal or inclined curve boreholes is made. Injection of a working fluid is made through injectors and oil extraction is made through producers. Operations are made at sections where collectors have natural fracturing and thickness less than 5m, they are placed at a distance of 6m from the water-saturated formation. The horizontal curve borehole is made as per the curved trajectory with its curve in azimuth with intensity up to 4/10m and length providing the cross-section of the fracturing direction under angle from 0 up to 90 degrees.

EFFECT: higher oil recovery of the deposit.

1 ex

FIELD: oil extractive industry.

SUBSTANCE: method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results.

EFFECT: higher efficiency.

2 dwg