The design of the multilayer wells
(57) Abstract:The invention relates to the oil industry, in particular to the wells, revealing when drilling several productive strata. Provides enhanced functions well due to the improvement of its design and the reduction of material costs by simplifying repair and insulation works. The device includes a casing with a mounting coupling, above the producing formation. It lowered the column tubing with a plunger having a seal and interacting with the installation sleeve. According to the invention in the casing between the productive strata and below the additional installation of the coupling. Column tubing is provided with an additional plungers. They are located at such distances from each other, and that the installation of the clutch casing, and interact with the relevant installation couplings. Part of the intervals of the column tubing between the perforated plungers. 1 Il. The invention relates to the oil and gas industry, in particular to the wells, revealing when Boo is amerom casing (114 mm and less).Known for well design, casing containing a column with the installation sleeve and tubing pipes (tubing) with patrolsim device (see ed. St. USSR 313958, BI 27, 1971).The disadvantages of the design are available pokerwise devices that require installation of additional technological operations.Closest to the proposed device is well design with the installation of the coupling, above the productive formation, which lowered the column tubing with a plunger having a sealing elements that interact with the installation of the clutch, with the possibility of axial movement (see "Gas supply", 3, 1975, S. 33-34).The shortcoming of the prototype is that it does not allow you to work simultaneously with multiple layers.Solved the technical problem is to create a well design that would allow the development, operation and repair of multi-reservoir field with a minimum of material and time expenses.The aim of the invention is to expand the functionality of the wells due to improvements in its construction and which is achieved by the described design of the multilayer wells including casing installation sleeve above the productive strata, which lowered the column tubing with plunger interacting with the installation sleeve.What's new is that in the casing between the productive layers placed additional installation of the coupling, and the column tubing is provided with an additional plungers mounted with the possibility of interaction with the relevant installation couplings, with some periods of the column tubing between the perforated plungers.From available sources, the patent and scientific literature we are not aware of the claimed set of distinctive features, therefore, the proposed construction of a multilayer wells meets the criterion of "significant differences".The drawing shows a diagram of the well design.Well design contains casing 1 from the installation couplers 2, interact with the plungers 3, installed on the tubing string 4. Casing has perforations 5 against each of the productive layers 6 and 7. Some of the intervals of the casing melem 9.Design works in the following way:
After drilling in the manufacture of geophysical research and identify prospective reservoirs. Then lowered into the well and cement casing 1 from the installation couplers 2, placed between the alleged productive layers 6 and 7 and above productive upper layer 6 and lower 7. Then produce the perforation 5 of the casing 1 against each of the productive layers 6 and 7. Then make the development of productive formations, exploring and defining the productivity and composition of products produced in each of the producing formations. Then make conclusions about the feasibility of using one or another of the productive formation. Further in the hole down the drill pipe 4 with the plungers 3 located at the same distances from each other, and that the installation of the clutch 2 in the casing 1, the presence of the plunger 3 seals 9, prevent the flow of fluid between the productive strata. The plot of the casing 4 between the plungers 3, which is opposite the productive formation 6, the results of research recognized as suitable for use, has a hole 8.In the case of changing the situation in the periodon tubing 4 extract, perforated holes 7 plot move to another level of the productive layer 6. Then the tubing is lowered into the well, in the previous reservoir 6 is disconnected from the operation, and the next 6 against which is perforated by holes 7 a section of tubing that is included.The example describes the well with two productive strata, actually there may be any number.Well design is also suitable for separate, simultaneous operation of reservoirs.Using the proposed design of the multilayer wells allows you to extend its functionality through timely enable and disable operation of productive layers, and to reduce material costs by accelerating and simplifying repairs.Sources of information
1. Auth. St. USSR 313958, BI 27, 1971.2. I. N. Boyko, N. N. Miller, A. S. Mite "New pokerwise device, Gas supply, 3, 1975, S. 33-94. The design of the multilayer wells, including a casing with a mounting coupling, above the productive layers, which lowered the column tubing t is th column in between the productive strata and below the additional installation of the coupling, and the column tubing is provided with an additional plungers located at such distances from each other, and that the installation of the clutch casing, and cooperating with relevant installation couplings, with some periods of the column tubing between the perforated plungers.
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.