Method of development of gas field

FIELD: gas industry.

SUBSTANCE: invention relates to gas industry and can be used in development of deposits of natural gas, mainly at the stage of falling production and at the final stage of development. Method involves selective, during seasonal decrease of consumer demand for gas, shutdown of gas wells in operational zones located in the roof part of the structure with reduced, relative to the average for the deposit, formation pressure and the most close to the center of the depression funnel. Shutdown is performed for a period required for compensation of losses of the formation pressure due to inflow of gas from peripheral zones with a duration determined by results of the previous shutdown. Taken into account is the point of intersection of the first time derivative of the function of gas inflow intensity to the operating zone of the stopped wells and the first derivative of the function of intensity of potential gas production defined as the first derivative of dependence of maximum output of the current formation pressure in the zone at a specified constant value of pressure at the inlet of the gas field. After the shutdown controlled is the value of formation pressure in the zones to its stabilization after starting the wells into operation. Herewith the number of operating wells and process modes of their operation are selected so that the volumes of extracted gas are maximum compensated due to its inflow from adjacent zones.

EFFECT: technical result is increased efficiency of development of deposits of natural gas.

1 cl, 1 ex, 1 tbl, 5 dwg

 



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and may be used in the operation of a horizontal well. According to the method well operation is performed. A pipe string is run down to the horizontal well. An insulating material is injected through the pipe string to a water-inflow interval of the productive formation. Oil is extracted until the horizontal well is flooded. Under the main borehole along the boundary of the oil-water contact an additional borehole is drilled from the horizontal well per 50 m longer than the old hole. The coil tubing is run down to the well complete from below with a hydraulic whipstock and a screen, which openings are covered hermetically by a hollow bushing. The process fluid is injected to the coil tubing thus creating an excess pressure. Simultaneously the coil tubing is moved down until it gets to the additional borehole. The coil tubing is run down up to the bottomhole of the additional hole. At the wellhead a top cementing plug is set into the coil tubing. An excess pressure is created in the coil tubing above the top cementing plug and the hollow bushing is moved thus opening the screen openings. Microcement grout is injected through the coil tubing and flushed to the additional hole and the bottomhole zone. Simultaneously the coil tubing is pulled out for the purpose of additional hole filling with the microcement grout. Flushing of the microcement grout is stopped when pressure increases in the coil tubing up to a permissible value. The coil tubing is pulled out from the well and the process is withheld for cement setting and hardening. The additional hole is cut off from the old hole by setting a bridge plug in a kickoff interval at the inlet to the offshoot. A pump is run down at the process pipe string to the old hole of the horizontal well and operation of the horizontal well is started. At water encroachment into the produced product the process pipe string with the pump is pulled out from the well, a geophysical study is performed and a water-producing interval is indentified in the horizontal well. The water-producing interval in the old hole of the horizontal well is isolated.

EFFECT: increased efficiency of the method due to the complete exhaustion of oil reserves from the productive formation notwithstanding the drawdown value.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil and gas industry, and namely to methods of automatic flow control at well operation of oil and gas deposit. According to the method injectors and producers equipped with pump units and electric motors are used. A passive sonar multiphase flow meter is mounted at the mouth of each well. Pressure, temperature and flow rate is defined continuously in real time for each phase, including water. The data are collected and transferred to automatic flow process control system continuously in real time. The data are averaged for a certain period of time. Average flow rate is processed and defined by phases for the selected period of time. The results are compared with preset parameters and based on flow rate data for each phase dependency of flow rate for each well is defined on pumped volume of brine water. Version of pump units operation with electric motors for producers is selected and maintained so that oil flow rate is maximum and pumped volume of brine water and power consumption is minimum. At that when design flow rate values are exceeded one of the following actions is performed: efficiency of pump unit is reduced due to reduced rate speed of the electric motor; efficiency of pump unit is increased due to increased rate speed of the electric motor; pump unit is stopped temporarily to accumulate oil in the bottom hole. Product of the producers is separated into phases and transported depending on the phase to oil and gas collection system or reservoir pressure maintenance system.

EFFECT: increased efficiency of the method due to increased oil flow rate, reduced volume of brine water pumped and reduced power consumption.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to systems of oil and gas equipment automatic control and allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment. According to the method gas pressure and temperature is measured periodically upstream and downstream gas equipment, gas flow rate through gas equipment or gas pressure drop is measured at orifice located in the gas flow passing through gas equipment. Then against measured values hydrate formation coefficient is formed for operating gas equipment and degree of hydrate formation is evaluated against deviation of this coefficient from the basic value determined in hydrate-free mode of gas equipment. In hydrate-free mode of gas equipment basic values of the above hydrate formation coefficient are used as technical state indicator for gas equipment.

EFFECT: method allows timely detecting of pre-emergency situations related to hydrate formation in gas equipment.

3 cl, 2 dwg

FIELD: oil and gas industry.

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

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

FIELD: physics.

SUBSTANCE: methods and systems for gathering, deriving and displaying the azimuthal brittleness index of a borehole are disclosed. Certain embodiments include various methods for calculating and displaying borehole measurements in real-time for geosteering and drilling operations. One embodiment of the disclosed method for calculating and displaying azimuthal brittleness includes a step of taking measurements of compressional and shear wave velocities as a function of position and orientation from inside the borehole. These velocity measurements are taken by an azimuthal acoustic device. Azimuthal brittleness is then derived based on the compressional and shear wave velocities.

EFFECT: high reliability of data of planning geological survey operations.

19 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes cyclic forced gas pumping from the annulus and pressure decreasing in it. Periodically the well flow header is partially closed. Pressure upstream the shutdown element of the header is increased to ensure the produced fluid supply to the expansion chamber of the tank with resilient element and to accumulate mechanical energy in the expansion chamber. Then full opening of the header shutdown element is performed. Pressure upstream the shutdown element is decreased, and fluid is displaced from the expansion chamber to the header due to the accumulated mechanical energy. Each cyclic volume increasing of part of the tank above the expansion chamber ensures annulus gas suction in it, and this volume decreasing ensures gas displacement to the header.

EFFECT: possibility of gas pumping from the annulus in tubing string of the well for different methods of mechanised oil production.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil production industry, in particular, to secondary and tertiary methods of enhanced oil recovery for beds with low oil saturation that envisage use of equipment for production of gaseous nitrogen with high pressure and temperature. Nitrogen compressor plant comprises a multistage piston-type compressor with a power drive unit made as diesel engine, and gas-separating unit. Output of the compressor intermediate stage is coupled to input of gas-separating unit. Output of gas-separating unit is coupled to input of the compressor stage, which follows the intermediate stage. At that nitrogen compressor plant includes heat exchanger, which working medium input is coupled to the compressor output. Input of the compressor heat exchanger is coupled to exhaust output of diesel engine. Gas-separating unit is made as a hollow-fibre membrane unit. Output of the heat exchanger working medium is coupled to input of additional heater. At that output of the additional heater serves as output of the station.

EFFECT: development of more effective means for oil extraction from low-permeable collectors complicated by high paraffin content.

8 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device comprises a pipe string run in to the well, a packer with a flow shutoff mounted in it. The packer is made as a hollow body with the upper row of openings placed above the sealing element in the packer. Inside the hollow body there is a pipe concentric to its axis and fixed rigidly to the pipe string from top and to the piston from bellow. The pipe with piston may be moved axially in regard to the hollow case of the flow shutoff. In the hollow body below the sealing element of the packer there is the lower row of openings. The piston is made hollow and plugged from below. Opposite the upper and lower rows of openings in the hollow body the piston is equipped with inner cylindrical sample capture and a row of feedthrough openings. In the hollow body above the upper row of radial openings there is a cam slot in the form of longitudinal groove and three transversal grooves. The transversal grooves are made from the upper, medium and lower parts of the lower part of the longitudinal grove. In cam slot of the hollow body there is a guide pin installed so that it may be moved axially and transversally. It is fixed rigidly in the piston above its upper inner circular sample capture. When the guide pin is placed in the transversal groove made of the medium part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper and lower rows of openings with over-packer and below-packer space of the well. When the guide pin is placed in the transversal groove made of the upper part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the upper row of openings with over-packer space of the well. The lower row of openings in the hollow body is sealed in tight-proof way by the piston. When the guide pin is placed in the transversal groove made of the lower part of the longitudinal groove, the device is designed to connect inner space of the pipe through a row of feedthrough openings of the piston, inner cylindrical sample capture, the lower row of openings with below-packer space of the well. At that the upper row of openings in the hollow body is sealed in tight-proof way by the piston.

EFFECT: simplified design of the device, improved reliability of its operation and expanded functionality.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas producing industry and can be used for annular gas bypassing to the flow string in wells operated by sucker-rod pump units. Task of the invention is to perfect design of the downhole device for annular gas bypassing in order to improve operational efficiency of the well sucker-rod pumping equipment notwithstanding temperature conditions of the well operation and pressure of annular gas. The device is placed in the well annular space over the well fluid level in the flow string collar. The device comprises a return valve and a radial hydraulic channel. In the collar lower part there is a radial hydraulic channel interconnected to the well annular space at the one side through the return valve and to the flow string cavity at the other side through a jet device. At that axes of the radial hydraulic channel and the jet device are crossed in the nozzle area of the latter. Besides the device comprises a flow string with a whipstock for gas-fluid flow in it. The whipstock is made as a bushing capable to be fixed in the flow string collar. Length of the whipstock for gas-fluid flow is less than distance between receipt and discharge of the jet device. Axes of the radial hydraulic channel and the jet device are perpendicular. Fixation of the whipstock for gas-liquid flow in the flow string collar may be implemented by equipping the flow string collar with an inner groove and the whipstock for gas-liquid flow with a ring holder.

EFFECT: usage of device allows reducing pressure of annular gas notwithstanding temperature and pressure conditions thus increasing life between overhauls for the sucker-rod pumping equipment; besides, this device allows reducing pump-setting depth for the sucker-rod pump due to increase of fluid level over the pump thus reducing consumption of the flow string and pump rods and increasing life between overhauls for the units.

3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: according to the method the hydraulic fracturing of formation is performed. After hydraulic fracturing of the formation in the well the proppant underflash is left. From above in addition from the coarse fraction proppant the bridge with a rated length is created. This length is selected in view of the condition of providing of counter-pressure on the proppant in the hydraulic fracturing crack sufficient for holding of proppant in a hydraulic fracturing crack at decrease of liquid level in the well down to the well bottomhole level. The package of downhole pumping equipment includes the antisand filter. During the well operation the antisand filter is placed directly over the proppant bridge. The liquid is sampled. The liquid level during liquid sampling - operation is maintained at the level of the deep-well pump.

EFFECT: increase in oil production.

1 ex

FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling of operation well, forming in productive bed within feeding range of operation bed of at least one level of main draining system by drilling horizontal shafts from operation well above productive bed, and driving said shafts in radial direction, also, to prevent fast watering of well, before start of its operation, hollows of horizontal shafts are isolated from operation well. In productive bed in feeding range of operation well on one level with main draining system additional draining system is formed, one additional level of main and/or additional draining systems is formed, hollows of operation well and horizontal shafts is additionally connected by hydraulic fracturing of bed, before isolation of hollow of operation well from hollow of horizontal shafts, filter is mounted in the latter, as well as porous oil-attracting hydro-repelling material.

EFFECT: higher efficiency and durability.

6 cl, 2 dwg, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes measuring volume and denseness of fresh oil in reservoir in case of even or balanced temperature and pressure. Combined sample of fresh oil is taken from pipeline during its draining and denseness of oil and bed water and ballast content is determined. Then mass of drained oil is determined with consideration of measured parameters. Prior to draining, fresh oil from reservoir is exposed until partial separation of bed water, and its denseness is measured. During draining of fresh oil, its denseness,, volumetric share of water therein, pressure and temperature are determined. Drained oil mass and percentage of ballast is determined from given mathematical expressions. Denseness of exposed bed water is measured on basis of sample, taken after exposure of fresh oil in reservoir. Denseness of exposed bed water is measured in its flow during draining from reservoir after exposure and before draining fresh oil. Volume of fresh oil in reservoir is measured continuously by its level and data from graduating table for reservoir. Draining of combined sample of fresh oil from pipeline during its draining is performed manually or automatically in case of constant kinetic condition. After exposure of fresh oil in reservoir point samples of fresh oil are taken, additional combined sample is made thereof and denseness of fresh oil, oil and bed water and ballast percentage is determined from it, and these parameters are used when evaluating precision of determining parameters of drained oil. Measurements of denseness, volumetric water share, pressure and temperature during draining of fresh oil in flow are performed periodically with averaging of current values of measured parameters for time interval, equal to period of change of parameters of fresh oil in reservoir. Mass of bed water MW is determined from given formula.

EFFECT: higher precision.

8 cl, 1 dwg

FIELD: mining industry.

SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.

EFFECT: higher efficiency.

2 dwg, 1 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes transporting hydrocarbon product along operation channel. Control of pressure changes along this channel is performed. If such change is present such debit of hydrocarbon product is set, which provides for destruction or decomposition of present natural gas hydrates and/or prevention of their forming. With this debit, to place of hydrates decomposition and/or prevention of their forming, alkali solution is fed with concentration 0.04-4.9% with "pH" greater than 10. Alkali solution is fed during time not less than time of pressure change along operation channel, as well as with flow and during time until achieving mass concentration of alkali in gas phase 10-15% of mass.

EFFECT: higher efficiency.

12 cl, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes full raising of cement in behind-pipe space up to mouth, sectioning wells by electro-isolating compounds from oil transporting system or bed pressure support system and use of cathode protection plant as cathode protection station with current controller. For each well time needed for completing cathode polarization of well is determined as well as time for well depolarization, during which potentials on well of cluster are lowered to minimal protective values. On each cluster well cyclic mode of cathode protection plant is performed: cathode polarization during completion of cathode well polarization and well depolarization during lowering potential on well to minimal protective values. During depolarization of one well cathode polarization of other cluster well is performed.

EFFECT: higher effectiveness.

1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: device has axial transmission and soft stripe support system. Axis connects electric engine to reducer and connected reducer and leading hub, by means of which transmission lines are actuated. After connection of driven hub and device for supporting pump bars, pump bar for actuating well oil pump can be connected. Leading hub can actuate transmission lines, including one connected to balancer, operating synchronously to operation of well oil pump in both directions. Also, device has base, corbel and platform, controller for controlling oil extraction process, transformer, frequency setting transformer, absolute values encoding means and braking tank. Said electric engine, reducer and leading and driven hubs are mounted on the platform. Controller, through setting frequency generator, functioning as main drive, is connected to electric engine. Controller is connected to encoding absolute values means, capable of displaying working conditions and receiving data about position and rotation angle of leading hub. Encoding means for absolute values and braking block compose a portion of device for determining movement and braking. Controller can contain central processing module, input/output module and liquid-crystal display. Controller can be connected to encoding extension means, immediately receiving data about angle, position and rotation speed of electric engine axis.

EFFECT: higher efficiency.

3 cl, 12 dwg, 1 ex

FIELD: oil-producing industry.

SUBSTANCE: the invention presents a method of purification of the underground potable water at a crude production. The method provides for limitation of traffic of pollutions by construction of boreholes and pumping in of solutions of reagents. Along the contour of the site of possible pollution they make a net of boreholes with the a controlled inter-pipe and drill string-borehole annulue space - a compound - boreholes, the distance between which and a number of steps is chosen depending on porosity and permeability of rocks. The steps of the compound-boreholes are placed perpendicularly to the traffic route of the natural stream of the underground potable water, and a pumping in of the solutions of reagents is made through annulue space and inter-pipe space of compounds - holes simultaneously with a crude and a gas production from a pay. The technical result is a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

EFFECT: the invention ensures a reliable provision of purification of underground potable water at simultaneous production of a crude and a gas.

1 dwg

FIELD: gas extractive industry.

SUBSTANCE: method includes extraction of resource by mechanical drilling and extraction of slurry and rock pieces through well. Gas extraction is performed by horizontal drilling with washing and back expansion, with concurrent cleaning and separation of fresh extracted mixture and accumulation of gas. Delivery of expander of ultra-large working size to expansion place is performed through well subjected for backward expansion. Pressure, temperature and composition of washing liquid is adjusted in such a way, that free natural gas, freed during mechanical drilling, was dissolved in drilling mud and separated from it only after passing of separator through rotating preventer. Expander in form of rocker with cutters is used, expanding well diameter up to ten meters and more.

EFFECT: higher efficiency.

2 cl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method includes insertion of compound of foam-forming and gas-forming substances, dissolving these in bed water, and forming of gas and foam and replacement of well liquid with foam, while as foam-forming substance sulphonole is used with sulphamine acid as reaction initiator. Liquid is extracted in two stages: at first stage upper portion of liquid column is piston-effected, at second stage water-soluble foam-forming substance is injected into well with foam stabilizer and reaction initiator, as well as gas-forming substance, while water-soluble foam-forming and gas-forming substances are inserted into well directly after piston-effecting, and water-soluble foam-forming substance additionally has surfactants. Mass of foam-forming substance is determined from conditions: Mff=(0.005-0.01)KMw, where K - component coefficient, Mw - mass of water removed from the well. As gas-forming substance, ammonium carbonate is used in amount 40-50 kg for 100 linear meters of water column in a well. Piston-effecting is performed with productiveness in no less than two times greater than well debit.

EFFECT: higher efficiency.

4 cl, 1 ex, 2 dwg

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