Method for oil development with horizontal wells

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil industry and can be used in multi layered reservoir development with horizontal wells. The method involves recovering the pools as the productive formation intervals along the horizontal bore of the development well. Filtered pipe strings are lowered. The horizontal well bore is sectioned with packers. The well production is separated. That is followed by the production selection and water injection. The formation is sectioned according to a permeability value. If the sections differ more than twice as much, water-swellable packers are arranged at the section boundaries. A filter inside is provided with a solid horizontal partition extending along the whole filter. This partition is used to separate upper and lower portions of the filter. The partition has a hydrophilic surface having a degree of hydrophility of no less than 99%. Capillary holes have a diameter of no more than 2 mm. The holes density is not less than 50 holes/m. A horizontal position of the partition is controlled by sensors mounted at an inlet and an outlet of the filter. An upper portion of a filter wall is perforated, while a lower portion is solid. A water portion is reduced in a liquid supplied from the well bore through the upper portion of the filter. The water is injected through the hydrophilic surface and capillary holes into the lower portion of the filter. In front of the perforations of the filter, the packer is mounted to cut off an annular space of the well. The lower portion of the filter has holes for water outflow into the annular space. The above water is pumped into another formation. The lower portion of the filter is not connected to the piping string, whereon the filter is lowered. The upper portion of the filter is connected to the pipe string. The low-water fluid is supplied from the upper portion of the filter into the pipe string, which is brought up by means of a pump.

EFFECT: more effective separation of oil and water in the well bore, more effective water-flooding and as a consequence the higher oil recovery factor of the deposit.

3 dwg, 1 ex

 

The invention relates to the oil industry and can find application in the development of multilayer deposits of oil wells with horizontal termination.

The known method of operation of the wells, including equipment wells up from the bottom of the column tubing with a packer on the end, pump deep switch, two concentrically arranged outer and inner columns tubing. Share the well packer above the reservoir. Serves layered products pump deep in cyclic mode "flow-stop" from the reservoir through the column tubing, through the switch, the annular space between the inner and outer columns, tubing, pipe and the bore of the pipe in the annulus between the production column of the well and the outer column tubing. Create and maintain in the upper part of the well pressure is not less than the degassing pressure oil and not more than the permissible pressure in the production casing. Organize the division at the top of the well and reservoir production into oil and water. Regulate the completeness of the separation duration of politicla operation of the downhole pump "stop" and the distance between the switch and socket to open the Yami. Direct the oil in the oil line. Water is supplied through a switch in the interior of the column tubing and the pipeline to the injection well well pumping water and/or the annular space between the production column and the outer column of tubing and casing tubing with the packer into the reservoir above the packer downhole pumping of water (patent RF 2490436, CL E21B 43/12, E21B 43/38, publ. 20.08.2013).

The closest to the technical nature of the present method is a method of separation and control of production inventory, drained horizontal well, including the descent into the well pipe string, cable, control devices in the form of electric valves measuring gauges temperature and pressure and with one or more packers, divisive downhole space. Apply the sensor, which serves for the measurement unit installed on the wellhead. Signals for opening and closing the regulating devices served by cable with wellhead control unit. The rise of products on the surface of the implement pump in in-line space. According to the invention is well built with a horizontal segment passing through the formation with the different zones of permeability. The packers set in the mountains of the horizontal section of the well, separating zone with different permeability. In-line space alienate the cap, above which are placed one above the other of the upper and lower regulating device, placed in a vertical hole and equipped with measuring sensors. Areas with the same or very similar permeability reported between the groups in the two streams, is in communication with the downhole space and upper entrance control device or in-line space and sign the bottom of the regulating device. The outputs of the regulating device in communication with the pump inlet, and the amount of opening of the regulating devices produce a frequency division by a single cable, which produce and removing parameters from the measuring sensors, the readings of which determines the amount of opening of each of the regulating devices. Each regulating device made in the form housed in the motor housing with gear, torque shaft which is connected through a connection "screw-nut" with the plunger and valve made with the possibility of a tight interaction with the saddle, below which is placed a glass of input channels that hosts the compensation chamber with flexible walls filled with lubricating fluid and is in communication with the inner space of the pusher and hermit sirbanum space, above the plunger. (Patent RF №2488686, CL E21B 43/14, publ. 27.07.2013 - prototype).

A common disadvantage of known methods is the complexity of data structures and insufficient separation of oil and water in the wellbore, resulting in low efficiency of the flooding system and the low rate of deposits.

In the proposed invention solves the problem of increasing the efficiency of separating oil and water in the wellbore, improve waterflood performance and, as a consequence, enhanced oil recovery reservoir.

The task is solved in that in the method of developing oil fields wells with horizontal termination, including the allocation of plots in the form of intervals of the productive formation along the horizontal wellbore of the production well, the descent of the column of pipes with a filter, the separation of the horizontal wellbore section packers, separation of products in the borehole, the simultaneous selection of products and the injection of water, according to the invention, portions of the reservoir providing permeability when they differ from each other in more than two times in a horizontal wellbore in places parcel post similar to swollen packer, the inner part of the filter is performed by separation of the solid horizontal partition, running along the entire filter into two parts - upper and lower, and the partition amaethyddol surface with the degree of hydrophilicity of not less than 99%, capillary holes with a diameter less than 2 mm and the density of the holes is not less than 50 resp./m, and its horizontal position control sensors placed at the beginning and at the end of the filter, the upper part of the wall of the filter perform perforated, and the bottom is solid and in the fluid flowing from the wellbore through the upper part of the filter, in the process of movement in the filter, the declining share of water, through which the hydrophilic surface and the capillary holes takes place in the lower part of the filter to the outlet openings of the filter set packer, cutting off the annular space of the well, where the lower part of the filter has openings for maintenance of the water in the annulus from which the water is pumped by the pump in the other layer, moreover, the lower part of the filter does not have a bonding with the column pipe, which descends filter, and the top part has the connectivity with it, the liquid with smaller amounts of water from the upper part of the filter into a string of pipe, is lifted by the pump to the surface.

The invention

The oil recovery oil fields developed by wells with horizontal end, is substantially influenced by the system of reservoir pressure maintenance by water flooding. One of the ways of its improvement is the use of wells for simultaneous production of liquid on one is the formation and injection water in another reservoir. No water to wells fail, and use division in a well selected fluid into oil and water. Water use for injection into the same hole at the top or bottom layer. Thus, increase the efficiency of the water flood deposits consisting of at least two reservoirs. In the absence of flooding on salese this method is used for disposal of water. However, existing technical solutions do not fully allow you to perform these tasks. In the proposed invention solves the problem of increasing the efficiency of separating oil and water in the wellbore, improve waterflood performance and, as a consequence, enhanced oil recovery reservoir. The problem is solved as follows.

In Fig.1 presents a schematic plot of oil deposits with the placement of the horizontal wellbore with the filter and the injection of water into the lower reservoir. In Fig.2 shows a schematic representation of a cut section of oil field perpendicular to the horizontal wellbore. In Fig.3 presents a schematic plot of oil deposits with the placement of the horizontal wellbore with the filter and the injection of water into the upper reservoir. Legend: 1 - reservoir, whence it is withdrawn liquid, 2 - producing well, 3 is a horizontal barrel, 4 - Colo is on the pipe, 5 - filter 6 - similar to swollen packers, 7-partition in the filter 5, 8 to the upper part of the filter 9 to the lower part of the filter 10 - packer at the beginning of the horizontal shaft 3, 11 - annulus, 12 - shank, 13 - cement ring, 14 - casing, 15 - perforation holes in the lower part 9 of the filter 5, 16 sensors horizontal partition 7, 17 - pump for pumping water in another reservoir, 18 - upper or lower reservoir for water injection, 19 - not a collector, 20 - packer between the layers 21 to the pump for lifting the production well to the surface, I, II, III - areas of the productive formation with different permeability.

The method is implemented as follows.

The plot of the productive layer 1 (Fig.1) oil deposits, represented by terrigenous or carbonate reservoir, penetrated by the borehole 2 with a horizontal shaft 3.

On the hydrodynamic studies determine the permeability of layer 1 along the horizontal shaft 3. Research has revealed three sections (I, II, III), characterized by the permeability more than twice. Studies have shown that this difference in permeability, the development of horizontal wells without packers significantly reduces the recovery of oil. Packer reduce the amount of water in the stream.

In the horizontal tube 3 down on the string of pipe 4, the filter 5 with swollen packers 6. Packers 6 RA is meshaut in places boundaries of the allocated sites I, II, III.

The filter 5 has the following structure (Fig.1, 2, 3): the inner part of the filter divided solid horizontal partition 7, which runs along the entire filter into two parts - the top 8 and bottom 9, and the partition has a hydrophilic surface with the degree of hydrophilicity of not less than 99%, the capillary holes with a diameter less than 2 mm and a density of not less than 50 resp./m Data, extreme values were identified by the research, which showed that in the majority of cases of depression in horizontal wells allow water to penetrate the hydrophilic wall 7 with capillary holes when such options. The oil does not penetrate the hydrophilic surface with capillary holes. The upper part 8 of the walls of the filter 5 has a perforation hole, and the lower 9 - solid, without holes. At the beginning of the horizontal shaft 3, to the perforations of the filter 5, set the packer 10, cutting off the annular space 11 of the borehole 2. Moreover, from the kickoff of the barrel 3 to the packer 10 is set shank 12, which is poured cement ring 13, and the casing 14. Before the packer 10 in the shank 12 of the upper part 8 of the filter 5 has perforations, in this area of the perforations 15 are available only in the lower part 9 of the filter 5. The lower part 9 of the filter 5 is not bonding to the colon, the second pipe 4, and the top part has the connectivity with it.

Horizontal partitions 7 control sensor 16 installed at the beginning and at the end of the filter 5. It should be noted that in this case the horizontal septum 7 should understand its horizontal position relative to the stretch of the barrel 3 in the reservoir 1. For example, in the area where the barrel 3 is in layer 1, the barrel does not lie in the horizontal plane. Similarly, with layers that are deposited at an angle to the horizon.

The process of the fluid in the borehole 2 is the following: in the liquid flowing out of the barrel 3 through the upper part 8 of the filter 5, during movement in the filter 5, the declining share of water, through which the hydrophilic surface and the capillary holes of the partition 7 is in the lower part 9 of the filter 5. From the lower part 9 of the water entering through the holes 15 in the annular space 11 and then into the main vertical or inclined-directional wellbore 2, from which the water pump 17 is pumped to the bottom (Fig.1) or the top (Fig.3) layer 18, separated not by the collector 19. It should be noted that the injection in the other layer should be in the layers of the compatibility of formation waters in order to avoid precipitation of salts, or add reagents to the surface through the annulus. To prevent crossflow between layers 1 and 18, set the packer 20, idcast with smaller amounts of water from the upper part 8 of the filter 5 into a string of pipe 4, is lifted by the pump 21 to the surface.

Similar operations are performed on other horizontal wells.

Development lead to full cost-effective development of the reservoir.

The result of the implementation of this method is to increase the efficiency of separating oil and water in the wellbore, increasing the efficiency of water flooding and, as a consequence, enhanced oil recovery reservoir.

A specific example of the method

The plot of the productive layer 1 (Fig.1) oil wells are presented carbonate reservoir and pure oil area, lying at a depth of 1050 m and a thickness of the productive stratum h=15 m, opened by the well 2 with an open horizontal shaft 3 with a length of 300 m Diameter casing in the vertical part of the well is 146 mm

On the hydrodynamic studies determine the permeability of layer 1 along the horizontal shaft 3. Research has revealed three sections (I, II, III), characterized by the permeability k is more than two times: kI=60 MT, kII=150 m, kIII=380 MD. In the horizontal shaft 3 is lowered on tubing (tubing) 4 73 mm diameter filter 5 of the same diameter with two swollen packers 6. Packers 6 are placed in the locations of the boundaries of the allocated sections I, II, III.

The filter 5 has the following structure (Fig.1, 2, 3): the inner part of the fil the RA is divided solid horizontal partition 7, running along the entire filter into two parts - the upper 8 and lower 9. The partition 7 has the following dimensions: width equal to the diameter of the filter 73 mm, a thickness of 4.5 mm, a length equal to the length of the filter, i.e. 290 M. Wall 7 also has a hydrophilic surface with the degree of hydrophilicity 99,0%, the capillary holes of 2 mm diameter and density of the perforations 50 resp./m Hydrophilic surface obtained by diluting the composition of the company "Quartz" brand K1-FS in the water-based paint, applying it to the filter with capillary holes and subsequent drying. These values are the degree of hydrophilicity and capillary holes allow water to penetrate the hydrophilic wall 7 in depression 2 MPa and the corresponding flow rate of the liquid 45 m3/day. The upper part 8 of the walls of the filter 5 has a perforation hole, and the lower 9 - solid, without holes. At the beginning of the horizontal shaft 3, to the perforations of the filter 5, set the packer 10, cutting off the annular space 11 of the borehole 2. Moreover, from the kickoff of the barrel 3 to the packer 10 is set shank 12 length of 10 m and a diameter of 112 mm, which is poured cement 13, and the casing 14. Before the packer 10 in the shank 12 of the upper part 8 of the filter 5 has perforations, in this area of the perforations 15 are available only in the lower part 9 of the filter 5. The lower part 9 of the filter ne is bonding with the column pipe 4, and the top part has the connectivity with it.

Horizontal partition 7 is controlled by a level sensor 16 installed at the beginning and at the end of the filter 5.

The process of the fluid in the borehole 2 is the following: in a liquid flow rate of 45.0 m3/day and a water content of 73% (these measurements were obtained prior to release filter with hydrophilic partition), falling out of the barrel 3 through the upper part 8 of the filter 5, during movement in the filter 5, the declining share of water up to 50%. The flow rate of fluid entering the tubing string 4 is 24 m3/day. This is due to the fact that part of the water through the hydrophilic surface and the capillary holes of the partition 7 is in the lower part 9 of the filter 5. From the lower part 9 water flow rate of 21 m3/day falls through the holes 15 in the annular space 11 and then into the main vertical shaft 2, from which this water, respectively, with a flow rate of 21 m3/day using a pump 17 is pumped into the lower reservoir. Thus, on the surface of the liquid rises with a rate of 24 m3/day, and is pumped into the lower reservoir water with a flow rate of 21 m3/day. To prevent crossflow between layers 1 and 18, set the packer 20. The liquid with smaller amounts of water from the upper part 8 of the filter 5 into a string of pipe 4, is lifted by the pump 21 to the surface.

Similar operations are performed on the other horizontal wells. Thus, in the total deposits of the development of the upper reservoir carry out horizontal stems producing wells, vertical trunks are also used for injection into the lower reservoir (Fig.1), and the development of lower layer carry out horizontal stems producing wells, vertical trunks are also used for injection in the upper layer (Fig.2).

Development lead to full cost-effective Deposit output.

As a result, the development time deposits, which have limited water wells up to 98%, with one element comprising one of extractive and accordingly the same injection well at each layer extracted 311,5 thousand tons of oil, the oil recovery factor section of the formation (KIM) was 0,335. The prototype ceteris paribus extracted 274,3 thousand tons of oil, CIN was 0,295. The growth of KIN of the proposed method - 0,040.

The proposed method can improve the recovery factor.

The application of the proposed method will solve the problem of increasing the efficiency of separating oil and water in the wellbore, improve waterflood performance and, as a consequence, enhanced oil recovery reservoir.

The way of the development of oil deposits wells with horizontal termination, including the allocation of plots in the form of productive intervals the Lasta along the horizontal wellbore of the production well, run a string of pipe with a filter, the separation of the horizontal wellbore section packers, separation of products in the borehole, the simultaneous selection of products and the injection of water, characterized in that the sections of the reservoir providing permeability when they differ from each other in more than two times in a horizontal wellbore in places parcel post similar to swollen packers, the inner part of the filter is performed with the solid horizontal separation wall running along the entire filter into two parts - upper and lower, and the partition has a hydrophilic surface with the degree of hydrophilicity of not less than 99%, capillary holes with a diameter less than 2 mm and the density of the holes is not less than 50 resp./m, and its horizontal position control sensors placed at the beginning and at the end of the filter, the upper part of the wall of the filter perform perforated, and the bottom is solid and in the fluid flowing from the wellbore through the upper part of the filter, in the process of movement in the filter, reduce the share of water, through which the hydrophilic surface and the capillary holes takes place in the lower part of the filter to the outlet openings of the filter set packer, cutting off the annular space of the well, where the lower part of the filter has openings for maintenance of the water in the annulus, from which the water through the pump is pumped into the other layer, moreover, the lower part of the filter is not connected with the column pipe, on which the lower filter and the upper part is connected with it, the liquid with smaller amounts of water from the upper part of the filter, trapped in a string of pipe, raise the pump to the surface.



 

Same patents:

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1 tbl, 1 ex

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Well screen // 2514057

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3 cl, 5 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in drilling, seepage-volume characteristics of the bed and their alteration over borehole are defined, borehole is divided into zones that differ in said characteristics by 1.5-1.6 times to select filter performance separately for each zone and quantity of holes. Screen filter elements are fitted in filter holes under plugs. Flow string with filter equipped with water- or oil-swelling packers is lowered into well, said packers being set at boundaries of zones with different characteristics and string being fixed. Assembly is assembled at mouth and composed of the following elements arranged from bottom to top, i.e. cutter, locating bearing, screw downhole motor and stiff locator to be lowered against the stop to plugs. At cutting sheared plugs, flow string is displaced downward to remove sheared plugs and to withdraw the flow string. Flexible pipe sting is lowered to work face and displaced therefrom to mouth along with injection of plugging material to isolate holes made at filter bottom perimeter.

EFFECT: higher efficiency of extraction or injection, simplified mounting.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: device consists of a support tube with a number of longitudinal cuts, draining and filtering metal meshes. The meshes are corrugated longitudinally and placed with a gap in-between which is filled with granular filling. Perimeter of the filtering mesh in cross section is equal to perimeter of the well borehole.

EFFECT: improving reliability, fineness of filtering and service life of the screen.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and is intended for well strainers in producing and injection horizontal wells. The device contains a hollow case inserted into a well strainer component and an end plate made of magnesium and connected to the case in an annular groove inside the case. The groove is made in the upper part of the case; it has an inner cavity with a snap ring installed in it; the latter fixes the end plate inside the case rigidly. At the opposite side of the case there is an inner cylindrical cavity with mesh filter element with cells installed in it and fixed rigidly by a hollow sleeve. In the basic element an opening is made with the inner thrust, thread is cut inside the opening, the case blank is prepared, its length is measured and cut off, external screw thread is made and the annular groove and the inner cylindrical cavity are made inside the case; then the inner cavity is made inside the annular groove, the end plate is installed and fixed. The hollow case is overturned and the mesh filtering element is inserted into the inner cylindrical cavity, fixed by the hollow sleeve; then the hollow case is crewed into an opening at the basic element with end plate to outside until tight.

EFFECT: improving operational efficiency and service life of the strainer, simplifying its assembly.

2 cl, 2 dwg

Well filter // 2509206

FIELD: mining.

SUBSTANCE: device comprises a hollow body with radial holes closed with a tight fit by hollow cut pins, a filtering unit placed outside the body and forming a circular cavity with the latter, which is hydraulically communicated with the body cavity via hollow cut pins in the working position of the device. Each of the hollow pins is made in the form of a sleeve with a bottom placed in the cavity of the body, and the side surface having the external ledge, which fixes the sleeve at the outer side of the body, and an outer transverse corrugation that fixes the sleeve at the opposite - internal side of the body.

EFFECT: higher reliability of operation.

3 cl, 2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: aperture filter comprises perforated load-bearing pipe and slot filtration element made up of wire wound on lengthwise elements in helical line. Wire cross-section feature pentahedral shape. One of wire faces is parallel with filter lengthwise axis to make its outer surface. Every cheek has two faces. Top faces make filtration gap while bottom faces converged to form acute angle. Top faces are perpendicular to filter lengthwise axis and parallel with top faces of adjacent turns. Angle of inclination of top faces from crosswise axis is larger than that of bottom faces. Angle of bottom faces connection is rounded.

EFFECT: higher reliability, efficiency and wear resistance.

11 cl, 11 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device tail pipe fitted at pump inlet to extend through packer, mid pipe plugged from above to make with tail pipe a concentric chamber plugged from below, accumulating pipe of solid particles, cylindrical filtration element arranged between tail pipe and accumulating pipe. Concentric chamber has radial channels arranged directly above and below the packer. Horizontal perforated girths are arranged between radial channels in mid pipe, mid pipe being furnished with through holes. Spring loaded top and bottom valves rigidly connected by rod are arranged on both sides of said horizontal girths. Leaky piston is arranged above top valve spring, piston diameter being equal to top valve diameter. Elasticity of top spring exceeds that of bottom spring.

EFFECT: expanded performances.

7 dwg

Well filter // 2244103

FIELD: oil extractive industry.

SUBSTANCE: device has perforated body, multi-layer filtering element and is additionally provided with torsion spring, concentrically placed between body and filtering element, while filtering element is made with possible increase or decrease of dimensions in radial direction during coiling or uncoiling of spring.

EFFECT: higher efficiency.

2 dwg

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