The method of extracting oil from gas wells from oil-containing layers

 

The invention relates to the oil and gas industry. Provides oil and gas from one well, which eliminates the necessity of using a separate network timing, additional devices in the well, the need for their services and, ultimately, leads to lower capital and operating costs for production of hydrocarbons. The inventive method includes opening the gas and oil reservoirs perforation and lift on the Elevator column. The opening of the gas and oil reservoirs perforation is produced from one well. The number of perforations and perforation interval oil reservoir set of conditions ensure design flow rate of gas production. 4 C.p. f-crystals, 1 Il.

The invention relates to the oil and gas industry, and is intended for use in the operation of gas and gas condensate wells in the gas fields and especially in those cases where the extraction of the oily layers separate grid is not cost-effective because of its small flow rates and high capital and operating costs.

The problem is cost-effective extraction of oil from a thin (2 is that the field is a gas, while oil may be of subordinate significance. However, the optimal extraction of all components of the natural system is a challenge and is determined by the requirements of the protection of natural resources.

The implementation is provided by the energy of the produced gas from the group gazoneftyanykh of formations opened the same bore and being in close thermobaric conditions.

The known method of compressor gas during oil extraction from oil and gas fields [1].

How is that collected during field gas separation at the compressor station is compressed to the required pressure and is served in the annulus of the oil wells to the depth of placement of the gas lift valve in a tubing string. Passing through the gas lift valve, the gas is mixed with the stream of oil and reducing the weight of products, provides oil production in a given mode of operation of this well.

The disadvantage of this method is the necessity of using compressors for compressing gas-lift gas and industrial training, run a separate network timing, additional devices in the borehole (valves), the need for their maintenance, etc. is on the utilization of associated gas.

For marginal oil wells oil production separate net oil wells in this way becomes unprofitable.

There is a method of natural pressure of the gas [2], is selected as the closest analogue, implemented in the oil and gas industry, where the production of gas and oil separate grids wells. In this way part of the high-pressure gas produced from gas wells, after commercial processing on the installation of complex gas preparation (hereinafter - the unit is in oil wells for gas lift operation. The other part of the gas enters the main gas pipeline to the consumer.

This method does not require special compressor equipment and systems additional processing gas. However, it comes with all of the other disadvantages of the first method and, in particular, the drilling of additional wells.

When creating the present invention solved the technical problem of oil and gas from one well, which eliminates the necessity of using a separate network timing, additional devices in the well, the need for their services and, ultimately, leads to lower capital and operating costs on production iGO oil reservoirs perforation and gas lift oil lift column the opening of the gas and oil reservoirs produce from one well, and the number of perforations and perforation interval oil reservoir set of conditions ensure design flow rate of gas. Shoe tubing string may be disposed within the oil reservoir and in the well can be installed downhole devices, such as packers or fittings regulators.

The flow of oil from the perforated portion of the oil reservoir is of subordinate importance and is determined by the need to maintain wellhead pressure sufficient for trade processing of the product gas mixture to unit.

The invention is illustrated in the drawing, which shows one of the possible schemes of implementation of the method in which the gas reservoir 1 and the underlying oil reservoir 2 are within the same producing horizon 3, i.e. practically the same temperature and pressure conditions. The basic elements of well design and conditions of opening of the productive horizon include the production casing 4, the lifting column 5, the perforation holes in the gas reservoir 6 and the perforation holes in the oil reservoir 7.

The diameters of the operational and lifting columns, degree of dissection, perforation density and diameters of the e performance conditions of the mining the gas and condensate, as the primary commodity production wells coming on the unit.

Oil from the oil reservoir in a given amount realized by the energy extracted from the gas reservoir gas, which eliminates the need for the construction of individual oil wells.

The oil production rate at the perforation of oil and gas reservoirs from one well, for example, for the case where these layers are close thermobaric conditions, and the bottomhole pressure in the gas reservoir is specified, can be defined by the equation:

where RPL- pressure; RZB- downhole pressure; knand hnthe absolute permeability and the effective capacity of the oil reservoir; qnand qgthe flow rates of oil and gas;=(RPL+PZB)/2 is the average pressure in the drawdown zone of the well; a and b are the filter coefficients in the gas reservoir; Rtoand rcis the radius of the path of power and boreholes;1and2factors imperfections on the degree and nature of the opening in the oil reservoir;(is a function of the phase pronitsaemostei with [3].

The gas flow rate qgand downhole pressure PZBin this equation are determined by the design mode of operation of the well, which provides the desired gas from a gas reservoir.

The method is illustrated by the example of the calculation, which means that in the oil reservoir to then=0.25 D (Darcy); hn=400 cm;()=0,424; Rto=300 m and rwith=0,1 m

Project gas production qg= 200 thousand m3/day.

Under the terms of the production and fishery products processing unit (storage conditions of high pressure at the wellhead, the stable operation of trains, vehicles trade processing of gas and so on) the oil and gas factor (the ratio of the volume of extracted oil to the volume of the produced gas) fng6070 cm3/m3. The filter coefficients a and b of the above formula for the gas reservoir are respectively a=4,95 MPa2·day/thousand m3and b=2,33·10-4(MPa·day/thousand m3)2.

The initial formation and downhole pressure and this, respectively, PPL=13,89 MPa and PZB=13,53 MPa. After a preset period of time (e.g. 10 years) they will be RPL=10,02 MPa and PSB=9,51 MPa p is carried out as follows:

1. Set the initial oil and gas factor, such as fng=45 cm3/m3where initial daily production rate of oil is qn=104,17 cm3/s

2. From equation (1) with initial data (Plast pressure and depression) is determined by the required total value of the coefficients of imperfections on the degree and nature of the opening of the oil of the reservoir in the well, i.e. this value with which you can limit the initial oil production rate until qn=104,17 cm3/s:

1+2=1,2

3. Largest1+2= 1,2 is determined by the number of perforations and the spacing of the perforations in the casing within the oil reservoir. From the graphs [4, S. 120] are defined: the value of2=0,9 (when the diameter of the hemisphere of holes equal to 0.05 m, and 10 holes 1 tap. m) and1=0,3 (when the diameter of the bit equal to 0.2 m, and the opening of a significant part of the thickness of the formation).

4. Again is determined by the flow rate of oil and gas factor over a specified period of time (10 years), subject to certain on p. 2 coefficients

qn=149 cm3/

5. Oil and gas is again determined factor, which is equal to fng=64.4 cm3/m3<70 cm3/m3.

Thus, over a long period of time, that the oil and gas factor is given technological conditions limits (up to 70 cm3/m3).

By changing the density of the perforations, etc. may change in the share1and2while keeping their sum constant.

If the total flow rate of gas and oil do not provide conditions for trade processing gas mixture to unit, where the gas is the primary commodity production, it is necessary to limit the flow of oil. This restriction is possible by increasing the coefficients of imperfections on the extent and / or nature of the autopsy1and2in the oil of the reservoir.

If thermobaric conditions jointly opened one well gas (primary) and oil deposits are different, the method of oil extraction is provided with additional downhole devices, including, for example, a production packer downhole fittings - region oil deposits of the Urengoy field", volume 1, S. 423, VNIIGAZ, M., 1990,

2. Smirnov, B. C., Gentle L. N., Kucherov, G., Kudrin A. A. "Assessment of the conditions of the natural pressure of the gas lift for oil wells Urengoy gas condensate field". VNIIGAZ, Sat. Scientific works "the Gas industry, high-performance machines", S. 72, M, 1995

3. Dontsov K. M. "the Development of oil fields", M., Nedra, 1977, S. 200.

4. Ants C. M. "the development of oil and gas wells, M., Nedra, 1973

Claims

1. The oil extraction method, including the opening of the gas and oil reservoirs perforation and gas lift oil lift column, characterized in that the opening of the gas and oil reservoirs perforation is produced from one well, and the number of perforations and perforation interval oil reservoir set of conditions ensure design flow rate of gas.

2. The oil extraction method under item 1, characterized in that the Shoe tubing string is placed within the oil reservoir.

3. The oil extraction method under item 1, characterized in that in the well installed downhole device.

4. The oil extraction method on p. 3, characterized in that the quality of the downhole devices used packers.

5. The oil extraction method on p. 3, characterized in that as the

 

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The downhole choke // 2162931
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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

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

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