Method for non-uniform multizone oil pool development

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

 

The proposed method relates to the field of oil field development, presents a heterogeneous multi-layer headers.

There is a method of developing oil fields by drilling horizontal and vertical wells [U.S. patent No. 4718485, CL E 21 In 43/14, 1989]. The disadvantage of this method is the low recovery factor multilayer deposits because of the small sweep drainage on the thickness of the object of development.

The closest in technical essence to the present invention is a method of developing an inhomogeneous multilayer oil fields, including drilling vertical and horizontal wells, the injection of the displacing agent, selection of products. Wells with vertical shafts are drilling on rarefied design grid. Then Buryats for each layer producing wells with horizontal trunks, with a beginning and an end of the horizontal shaft is placed at the same distance from the source of the displacing agent, and a barrel length of the production well in the reservoir set in direct proportion to the oil and inversely proportional to their productivity, and the length of the barrel in the horizontal producing wells in rows garter set not more than 70% of the distance on the design grid (see RF patent №2024740 C1, BI No. 23, 1994).

what dostatkom of this method is the low production rate of the well and the recovery factor of the multilayer deposits because of the loss of the effective length of the barrel in the unproductive part of the section.

The technical objective of the proposed method is to increase oil recovery by increasing the effective length of the barrel, and by increasing the influx of displaced oil from areas with large values of compartmentalisation in areas with large values of the fraction collector.

This task is achieved by the described method of mining heterogeneous multilayer oil fields, including drilling vertical and horizontal wells, the injection of the displacing agent, selection of products.

What is new is that producing horizontal wells and/or branched horizontal wells are drilled in areas with smaller values of ruggedness, large values of the fraction collector and the zones merge layers in the developed object, injection wells located in this area, transferred to oil production, as part of the extraction wells located along the boundaries of this zone, learn to injection of the displacing agent with prior injection into the high-permeability reservoirs rims high-viscosity fluid for the direction of the main flow of fluid is oil and the displacing agent in the area of horizontal wells.

Figure 1 presents the layout of injection and production of horizontal and vertical wells on the site of the Deposit.

Figure 2 a section along a-a in Fig 1.

The way the wasp is estlat in the following sequence.

Stacked field, presents a heterogeneous reservoirs, razvarivat vertical wells sparse grid in two or more times less design. Grid drilling depends on the size of the Deposit and its geological structure. If the field has considerable dimensions and parameters of the layers does not change as the cut and square, the original vertical wells drilled in the more rarefied the grid. The initial drilling vertical wells allows you to update the geological structure of the Deposit and to plan the placement of horizontal and/or branched horizontal wells. According to the study of these wells to determine the number of these layers, their productivity and reserves. Explore zakonchennuyu area and power characteristics of the layers. The results determine the necessary type of treatment of oil reservoirs (natural mode, maintaining reservoir pressure, oil displacement agent), then are drilling horizontal wells in areas with smaller values of ruggedness, large values of the fraction collector and the zones merge layers in the developed object. Injection wells located on the land transferred under production and of production wells located along the boundaries of this zone are adopting the ml injection with advanced injection in high-permeability reservoirs rims high-viscosity fluid. Initiate producing horizontal and vertical wells for sampling production and injection wells injection. Is filtered oil and the displacing fluid from the injection wells in areas with lower permeability reservoir to the producing wells. The main fluid flow is directed in the operating area of the horizontal wells due to their great performance. The flow rates of horizontal wells is high because of the opening around the horizontal shaft only productive deposits. Because of the larger oil flow to horizontal wells, there is an increase recoverable oil reserves in the zone of horizontal wells. Increases as the current selection of oil horizontal wells due to the increase of flow rate and total oil production by increasing the rate and duration of operation of wells.

An example of a specific implementation.

The mine has rasberry design grid vertical production and injection wells (figure 1) sparse relative to the design grid, made his arrangement. Made the download agent injection 1 and the extraction of oil from production wells 2. Took measurements of oil production and water injection. Built lithological maps and the treatment tip can the Italy oil, the displacement parameters determined recoverable reserves. The area is 4800 tons of geological and 2400 tons of recoverable reserves. Then drilled producing horizontal and/or branched horizontal wells 3 in areas with smaller values of ruggedness, large values of fraction collectors (figure 2) 5 and the zones merge layers 4 in developing the object of development. Injection wells located in this area were transferred under production and of production wells located along the boundaries of this zone has mastered injection, pre-injection in high-permeability reservoirs rims high-viscosity fluid. Put them under the injection of produced production from producing vertical and horizontal wells.

The total thickness of the reservoir is 11 m, of these, 3.7 m collector 6, the total length drilled a horizontal well is 400 m, by a known method development inhomogeneous oil field 270 m would be in the collector 130 ncollector, thus 67% of the length of horizontal wells are located in the header.

According to the method of development of heterogeneous multilayer oil field Qretrieve1 well was 100 t·t/SLE, on the proposed 150 t·t/SLE. The initial rate of horizontal wells by a known method is qN=6.7 tonnes/the ut, the proposed method qN=10 t/day.

Oil production in the proposed method the development of heterogeneous multilayer oil field for 10 years will be $ 948 tons, according to the method 638 tons of Additional oil production in the application of the proposed method of development of heterogeneous multilayer oil field for 10 years will amount to 310 tons the Price of this additional crude oil in rubles will be (when the oil price is 3500 rubles per ton) 1085 million rubles the cost of 4-x drilled horizontal wells is 40 million rubles, the operating costs of the extraction of additional crude oil will be, when the production costs of oil production 2 thousand rubles per ton:

310000-2000=620 million rubles

Savings for the entire period of work will be

1085-620=465 million rubles

Average annual economic effect will be 46.5 million rubles, 1 well - 11,625 million rubles

How to develop a heterogeneous multilayer oil fields, including drilling vertical and horizontal wells, the injection of the displacing agent, selection of products, wherein the producing horizontal wells and/or branched horizontal wells are drilled in areas with smaller values of ruggedness, large values of the fraction collector and the zones merge layers developed in the object, n is greately well, in this section, transferred to oil production, as part of the extraction wells located along the boundaries of this zone, learn to injection of the displacing agent with prior injection into the high-permeability reservoirs rims high-viscosity fluid for the direction of the main flow of fluid is oil and the displacing agent in the area of horizontal wells.



 

Same patents:

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.

2 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.

2 dwg

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 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

The invention relates to the field of the oil industry and can be used for watering operation of oil wells with multi-layer heterogeneous structure of the productive interval

The invention relates to the oil and gas industry

The invention relates to pumping units for separate operation of several reservoirs

The invention relates to borehole development and operation of multilayer deposits of hydrocarbons

The invention relates to the field of extraction fluid and mineral resources of the two producing horizons, in particular aquifer, one well and can also be used in the extraction of mineral waters in the oil and gas industry

The invention relates to the oil industry, in particular to the wells, revealing when drilling several productive strata

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.

2 dwg

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.

2 dwg

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.

2 cl

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.

4 dwg

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.

2 dwg

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.

3 dwg

Up!