A method of operating a multi-layer oil fields
(57) Abstract:The invention can be used in the extraction of oil and gas in multilayer oil and gas fields. Provides improved reliability of the method and the optimal selection of fluids. The method involves separation of the barrel of the production well into zones of separate fluid reservoir, adjustable bypass them in the column tubing and joint ascent to the surface. Fluids from zones separate selection perepuskat in the column tubing in critical flow conditions, the relevant specified for each layer of the flow of fluid and the amount of depression on the formation. The pressure in the tubing pipe support at the level not exceeding the smallest of the critical pressure propuskayuschih fluid fittings. 1 Il. The invention relates to the oil and gas industry and can be used in the extraction of oil and gas from multiple zone oil and gas fields.The known method the joint exploitation of the layers of the multilayer deposits of similar filtration properties. In this method of operation the layers are combined into one object, productivity is ornago pipes (tubing) (1).The disadvantage of this method is the impossibility to control the pace of product selection from each stratum separately, which often leads to uneven development of the reservoir, and when the difference of the filtration characteristics of the layers to the lack of inflow to the reservoir with poorer reservoir properties.The known method of operation of multilayer deposits together with separate operation of reservoirs, including the separation of the well packer in the area of sampling fluid from a separate reservoir, the fluid in the separated zone, bypass them in the drill pipe and joint lifting of fluids on the surface of one column (2).The disadvantages of the method are associated with low reliability required for it equipment, the need to change the fitting as changes in the properties of the extracted Neftegazovaya mixture, as well as the inability of the joint operation of more than two layers, as the regulation is only one layer.The technical task of the invention is to improve the reliability of the method and ensuring optimal selection of fluids in reservoirs and co-operation of more than two layers with different collection soudani, including when together-separate sampling of reservoir fluids, providing for the separation of the barrel of the production well into zones of separate fluid reservoir, adjustable bypass them in the drill pipe and joint ascent to the surface, the fluids from zones separate selection perepuskat into the tubing string at critical flow conditions, the relevant specified for each layer of the flow of fluid and the amount of depression of the reservoir, the pressure in the tubing string is supported at a level not exceeding the smallest of the critical pressure propuskayuschih fluid fittings.The proposed method of mining involving together-separate operation of several layers one well, is illustrated by a drawing.Field drilled according to the scheme of development of injection wells and producer, arranged in the following way. In the well 1 down tubing (tubing) 2 packers 3, which share the productive formations, and placed under the packers in the area of productive layers fittings 4 critical flow (3) designed for individual consumption of fluid and the amount of depression for each stratum. Tubing 2 with packers 3 and the critical value is set tubing 2 install the lifting column 6, which is a standard fontanne equipment or standard equipment for the mechanized method of lifting fluid.Field development in productive strata support the pressure being pumped into them through injection wells displacing agent (water), and wireline fluid to rise up to the surface through production wells. The work of producing wells 1 with the joint operation of reservoirs proposed method is as follows. During the development of wells in the fountain mode or by mechanical means on the fittings 4 are the differential pressure between the bottom of the respective reservoir and the cavity of the tubing 2. As well in mode, the differential pressure on the fittings increases and reaches its critical value. The velocity of flow at the outlet of the nozzle reaches a critical speed, and the consumption of its maximum value, for each individual nozzle. Further reduction of pressure in the stationary tubing does not change the costs and established the calculated values of depression on each layer, as in the nozzle critical flow velocity cannot exceed the critical (thermal) velocity of the molecules.The proposed method for joint operation of reservoirs stacked field has the following advantages: a layer of low gas content, which in a separate operation, the oil must be raised by mechanical means, in the presence of a layer with high gas content can be operated fountain way; uneven watering reservoirs watering reservoir may be designed fountain way up to 90% water cut and above by the energy of the other layers; can be connected together for separate operation of one well several (more than three) of productive horizons; as a result of joint operation of reservoirs will significantly increase the total well flow rate, and consequently, will increase the flow rate and temperature sistemafinleasing tubes.An example of the calculation.East-Yangtinskoe field, the well 19, the joint operation of reservoirs BS11-12and th1presented in the table.The reservoir permeability differ considerably. The joint operation of reservoirs one object impossible.Calculation of the critical nozzles (nozzles) for each object operation.The reservoir BS11-12.The calculated critical pressure fitting
Pc= 0,5 PC.The calculated critical speed
vc= 103[Pc/a (1-a) W]1/2= 103[10,5/0,3560,644794]1/2= 240 m/s,
where a = 0,356 is the volume fraction of gas at the critical pressure;
W= 794 - density liquid phase.The estimated cross-sectional area of the nozzle (nozzle)
S = QWb/vc= 2401,82/240243600 = 2,110-5m2,
where b = 1,82 - volume ratio.The estimated diameter of the fitting
d = [4S/ ]1/2= [42,110-5/3,14]1/2= 5,210-3mThe estimated length of the critical fitting
L = 510-3(vc2c/PC-Pc) = 510-324020,510-3/10,5 =0,0137 m,
wherec= 0,510-3kg/m3the density of the mixture.The reservoir Yu1 The calculated critical speed
vc= 103[Pc/a(1-a)W]1/2= 103[13,5/0,3140,686864]1/2=269 m/s,
where a = 0,314 is the volume fraction of gas at the critical pressure;
W= 864 - density liquid phase.The estimated cross-sectional area of the nozzle (nozzle)
S = QWb/vc= 631,61/269243600=4,3610-6m2,
where b = 1,61 - volume ratio.The estimated diameter of the fitting
d = [4S/ ]1/2= [44,3610-6/3,14]1/2=2,36 10-3mThe estimated length of the critical fitting
L = 510-3(Vcc/PC- Pwith) = 510-326920,6 10-3/13,5 = 0,016 m,
wherec= 0,6 10-3kg/m3the density of the mixture.The optimal mode of operation of the reservoir Yu1provided critical fitting diameter of 2.36 mm and a length of 16 mm at a critical pressure of 13.5 MPa.To ensure optimum performance of both layers in the pipe 2 (see drawing) it is necessary to maintain the pressure above the 10.5 MPa.When the pressure at the wellhead is not higher than 3 MPa is provided gushing mode of operation of the well.Sources of information
1. Gimatdinov W. K. Reference book on oil production. M., "Nedra", 3. Great Soviet encyclopedia (see "nozzle"). A method of operating a multi-layer oil fields together with separate sampling of reservoir fluids, providing for the separation of the barrel of the production well into zones of separate fluid reservoir, adjustable bypass them in the column tubing and joint ascent to the surface, characterized in that the fluids from zones separate selection perepuskat in the column tubing in critical flow conditions, the relevant specified for each layer of the flow of fluid and the amount of depression of the reservoir, the pressure in the tubing pipe support at the level not exceeding the smallest of the critical pressure propuskayuschih fluid fittings.
FIELD: oil and gas extractive industry.
SUBSTANCE: device has operation columns of upper and lower well zones, placed eccentrically one inside the other in upper zone of well, double airlift column, mounted in upper well zone, and double airlift column, connected to operation well of lower well zone, separation column, mounted coaxially to operation column of upper well zone, and cementation pipe. According to invention, in a well with significant power of non-productive zone it is equipped with additional separating column with cleaning channels for lowering drilling tool therein and drilling well to lower well zone with removal of drilling slurry by double airlift column of upper zone through cleaning channels. Additional separating column is combined coaxially with operation column of lower well zone and is rigidly fixed to separation column.
EFFECT: higher efficiency.
1 dwg, 3 cl
FIELD: mining industry.
SUBSTANCE: at least one pipes column is lowered into well with constant or variable diameter with or without plugged end, with at least one packer lowered below upper bed of hydraulic and/or mechanical effect with or without column separator. Below and above packer mounting assemblies are lowered in form of well chamber, or nipples with removable valve for feeding working agent through them respectively into lower and upper beds, mounting packer and pressing it from downwards and/or upwards. Minimal absorption pressure for each bed is determined during pressing. Working agent is pumped from mouth into pipes column hollow at given pressure, directing it into upper and/or lower beds through appropriate detachable valves in mounting assemblies. Total flow of working agent is measured on the surface as well as mouth pressure and/or temperature in pipes column hollow and behind-pipe well space. Face pressure of upper bed is determined as well as pressure in pipes column and behind-column space at depth of detachable valve in mounting assembly above the packer. Flow of working agent pumped into upper bed through detachable well is determined, subtracted from total flow and flow of working agent fed into lower bed is determined. Actual flows of working agent for beds are compared to planned values. In case of differences mouth pressure is changed ad/or detachable valves for one or more beds are extracted from mounting assemblies by rope gears. Their characteristics and/or parameters are determined and altered. After that each detachable valve is mounted again into appropriate mounting assembly by rope gears and pumping of working agent through them into appropriate beds is resumed.
EFFECT: higher efficiency.
25 cl, 11 dwg
FIELD: oil industry.
SUBSTANCE: device has body with solid wall in central channel and three rows of radial channels. Moving branch pipe is put on the body with a pin. It interacts with figured groove, placed on the body. Stepped cylinder is connected to the body, which by lower end enters a packer, and by upper end is stopped against a spring. It is mounted between end of cylinder and ring-shaped shelf of moving branch pipe. Dependently on position of moving branch pipe connection of behind-pipe space where pump is positioned, occurs to zone of upper or lower productive bed.
EFFECT: simplified construction, higher efficiency, higher reliability.
FIELD: oil industry.
SUBSTANCE: device has raising pipes column, flow distributor, upper and lower packers, each of which has body and elastic collar. Flow distributor is made in form of sub with longitudinal radial channels. Device has central pipe, connected to lower portion of sub. Channels and pipe connect inter-tubular space above upper packer to well shaft below lower packer. Each packer is provided with drift-bolt and support sleeve, into the latter from which its body enters with possible longitudinal displacement and connected to it by shear elements. Also provided is branch pipe, connected by upper end to supporting sleeve of upper packer, and by lower end - to intermediate pipe or pipes with detachable connection, connecting upper packer to lower one. Branch pipe is made with inner disconnecting ring and above it - with radial channels, connecting inner space of raising pipes through longitudinal channels of sub to well shaft between upper and lower packers. Lower end of central pipe enters disconnecting ring of branch pipe. Also provided is supporting pipe or pipes with filter, connected to supporting sleeve of lower packer.
EFFECT: simplified construction, higher reliability, higher durability.
FIELD: oil field development, particularly to obtain oil from a multiple-zone well.
SUBSTANCE: method involves drilling vertical and horizontal wells, injecting displacing agent and recovering product. Production horizontal and vertical wells and/or branched horizontal wells are drilled in zones having lesser average number of permeable intervals and greater reservoir part values and in formation junction zones of field to be developed. Injection wells present in above zone are used for oil production. Some production wells arranged along above zone border are used as injection ones along with previous highly-viscous liquid plug injection into high-porous formations to direct main liquid flow, namely oil and displacing agent, to horizontal wells.
EFFECT: increased oil recovery due to enlarged effective well bore length and due to increased inflow of oil displaceable from zones characterized by increased average number of permeable intervals to zones with high reservoir part values.
1 ex, 2 dwg
FIELD: oil field development, particularly obtaining oil from a deposit by flooding.
SUBSTANCE: method involves drilling injection and production wells; injecting liquid in wells and extracting product. Wells are drilled along with local valleys and projections investigating. Natural formation water directions are assigned as water flow direction from projections to valleys. Then formation permeability anisotropies created by above flow are determined. Peripheral and line injection wells are located in correspondence with natural formation water flow direction, namely at outer oil-bearing contour from natural formation water flow entering side. Intracontour well rows are additionally arranged substantially transversally to natural formation water flow direction. Production wells are drilled substantially transversally to natural formation water flow direction.
EFFECT: increased oil output due to improved high-permeable formation injectivity and decreased number of injection wells.
1 ex, 2 dwg
FIELD: oil and gas industry, particularly downhole equipment to be installed in oil and gas reservoirs.
SUBSTANCE: device comprises hollow body with discharge channels threadedly connected to flow string. The body is provided with shell having orifices and pressure nut. Spring, valve and replaceable head are arranged in annular gap between the body and the shell. The spring is installed between upper and lower support washers. The valve is located between upper support washer and shell ledge. The replaceable head is secured to the shell by means of pressure nut. Sleeve with orifices is coaxially installed inside the body between body extensions so that the sleeve may be displaced by wire-line equipment tool to misalign or align sleeve and shell orifices with discharge body channels.
EFFECT: provision of fluid flow from underlying reservoir to overlaying one.
FIELD: oil and gas production industry, particularly methods or apparatus for obtaining oil, gas, water and other materials from multizone wells.
SUBSTANCE: device comprises packer with flow blocking means formed as hollow body with orifices located over and under sealing member of the packer. Pipe is arranged inside the body so that the pipe is concentric to body axis. Lower pipe end is connected to the body, upper part thereof cooperates with annular bush over outer pipe surface. Annular bush may move in axial direction and is provided with annular sealing means and with shear pins, which fixes the bush inside the body. After pin cutting annular bush moves downwards and closes body orifices located over sealing packer member to cut-off flow leaving orifices below sealing packer member.
EFFECT: extended water-free oil well operation period, increased oil recovery and reduced oil production costs due to elimination of water lifting charges and prevention of well bore zone contamination.
FIELD: oil industry.
SUBSTANCE: method comprises setting the jet pump into the well. The housing of the pump is provided with the central nozzle, openings for inflow of fluid, and radial passages. The openings for inflow of fluid are shut off by means of valving members. The jet pump is mounted between the top and bottom oil-bearing beds.
EFFECT: enhanced efficiency.
FIELD: oil production, particularly to produce watered oil and produced water utilization.
SUBSTANCE: pumping plant comprises pumps, which may be serially installed in well and provided with inlet and outlet means, drives and packer. Packer may be located inside well between beds. One bed is filled with oil-water mixture, another bed, namely lower one, is adapted for water receiving. Plant comprises screw pumps with drives installed on surface and polished shaft with gasket to connect worm shaft of upper pump with that of lower one. Lower screw pump has inlet means with radial orifices to receive water phase separated from oil-water mixture, as well as with slots. Lower pump comprises case, which defines channel for water injection into lower bed via above channel and through slots made in inlet means of lower pump during the same auger shaft rotation.
EFFECT: increased efficiency due to surface-driven screw pump usage.