Method for development of dome oil formation at last operational stage

FIELD: oil and gas industry.

SUBSTANCE: in the method for development of dome oil formation at last operational stage extraction of the product is made through producers and working fluid is injected through injectors. Local area of the deposit is selected according to difference of hypsometric depths between the producer and injector per 3 m and more. In the producer standard downhole pumping equipment is replaced by downhole pumping equipment operable on round-the-clock basis. When change in water cut per 10-15% is detected volume of extracted product is limited due to change in operation time of round-the-clock downhole pumping equipment. At that at the injector area injection is limited or the well is shut in completely. Periodic measurements are made for water cut changes in operation mode of the producer. When water cut is reduced operation is continued in elastic drive without start-up of the influencing injector. Periodic measurements of water cut and bottomhole pressure are repeated for the producer. When bottomhole pressure is reduced per 5% and more in regard to the initial measured value the injector operation is started and change in the main parameters of water cut and bottomhole pressure is controlled in the producers.

EFFECT: higher oil recovery of the deposit.

1 ex

 

The invention relates to oil industry and may find application in the development of dome petroleum deposits in the final stages of operation.

A method of oil field development at the final stage, in which the additional extraction of oil using existing wells. To do this, install a fluid sampling, multiple surpassing the previous selection. This forced withdrawal of the fluid is carried out on the well. Choose from a number of wells located in the zone dome uplift, which is closest to the assumed absolute maximum mark on the dome raising. Set the mode of selection of the liquid, allowing you to create the pressure gradient, which would exceed the previous pressure gradient (patent RF №2120543, publ. 20.10.1998).

The closest to the proposed invention the technical essence is a method of further development of oil deposits in its final stage of operation, whereby when the flooding of recoverable oil injection of the displacing agent is stopped. Carry out field tests in all wells that have penetrated the reservoir. This is accomplished by measuring the total amount of oil without water depending on time of accumulation in SLE�jinah at their Prime. Choose well, where you see an increase in the amount of oil from the time of its accumulation. Include these wells to the dome of the productive formation. Clarify the nature of the structure of its occurrence and use the dome of the productive formation as the main objects of oil production. Then set periodic mode of operation of production wells, perforated dome in parts, which involve the extraction of oil, without water. The mode of operation for each production well set individually on field tests, depending on the geological and physical properties of bottom-hole zone of each well and its location on the structure of the productive formation (RF patent No. 2116436, publ. 27.07.1998 - prototype).

A common disadvantage of the known technical solutions is the low oil recovery due to the lack of periodic monitoring of water content and timely response to changing water content in the extracted formation of products.

In the proposed invention solves the problem of increasing oil recovery of the reservoir.

The task is solved in that in the method of development of dome petroleum deposits in the final stages of operation, including the selection of reservoir production through production wells and the injection of working agent through injection wells, according to invent�Oia, choose a local site of a reservoir according to the hypsometric difference of marks between at least one upstream and at least one injection well in an amount of from 3 m and more, in a producing well are replacing standard pumping equipment pumping equipment with the possibility of operation time during the day, when it detects changes in the water content of 10-15% produces a limit on the amount of recoverable products produced by changing the operating time of pumping equipment during the day, on a site of injection wells produce restriction injection, or a complete shutdown of the well, produce periodic measurements of the change of operating mode of producing well by watering, by reducing the water content of continue operation in elastic mode, run without affecting the injection wells, re-produce periodic measurements of water content and changes in downhole pressure in a producing well, the bottomhole pressure decrease of 5% or more from the originally measured values produce the injection well and continue to control the change of the main parameters for water cut and bottom hole pressure in the production wells.

Summary of the invention

On Zach�uchitelnoj development stage dome oil deposits special attention to gaining control over the water-cut reservoir products and timely response to the change of water content. In the prior art there is no periodic monitoring of water content and timely response to changing water content in the extracted formation of products. Consequently, the recovery remains at a low level. In the proposed invention solves the problem of increasing oil recovery of the reservoir. The problem is solved as follows.

When designing the dome of an oil Deposit in the final stage of operation when the current water-cut reservoir production reaches 80% or more selected sheet products through production wells and pumped working agent through injection wells. Choose a local site of a domed deposits are located on a plot of at least one primary and at least one injection well and by hypsometric difference of marks between extraction and injection wells from 3 m and more. Thus, the perforated interval producing well is above the perforated interval of the injection well 3 and more meters In a producing well are replacing standard pumping equipment designed to ensure a constant flow-rate, deep-pumping equipment with the possibility of operation time during the day regardless of the resulting flow. Exploit dobivaius� well with the same flow rate. If you increase the water content of 10-15% produces a limit on the amount of recoverable products produced by changing the operating time of pumping equipment during the day. On injection wells produce restriction injection, or a complete shutdown of the well. Produce periodic measurements of the change of operating mode of producing well for watering. Upon receipt of the result by reduction of water content continue operation in elastic mode, run without affecting the injection wells. Re periodic measurements of water cut and bottom hole pressure in the production wells. When bottomhole pressure decrease of 5% or more from the originally measured values produce the injection well and continue to control the change of the main parameters for water cut and bottom hole pressure in the production wells. As a result it is possible to reduce the water-cut reservoir production and increase oil recovery of the reservoir.

An example of a specific implementation

Develop oil reservoir with the following characteristics: depth 1800-1920 m, reservoir pressure of 14.5 MPa, reservoir temperature from 36°C, the thickness of the layer from 3 to 50 m, a porosity of not less than 18%, permeability from 200 to 1200 m'kay, oil saturation of at least 75%, Vascos�ü oil not less than 15 MPa·s, the oil density 0.86 g/cm3. Collector - Sandstone - clayey Sandstone. The Deposit is in final stages of development, the current water-cut reservoir production is at least 80%.

Choose a local site of a domed deposits are located on the site of one primary and two injection wells with hypsometric difference of marks between the producing and injection wells from 3 m and more. Thus, the perforated interval producing well is above the perforated interval of the injection well at 3 p.m. In producing wells are replacing standard pumping equipment designed to ensure a constant flow-rate, deep-pumping equipment with the possibility of operation time during the day regardless of the resulting flow. Pumping equipment supply adjustable frequency drive and control system with pressure switch. Operate production wells with the same flow rate equal to 50 m3/day. Note the increase in the water content of produced of produced products. If you increase the water content of 10-15% produces a limit on the amount of recoverable products produced by changing the operating time of pumping equipment during the day from 5 to 30% relative to the initial time. P�and on injection wells produce limitation of the injection and/or complete shutdown of one well. Produce periodic measurements of the change of operating mode of producing well for watering. Upon receipt of the result by reducing the water content of 5-15% continue operating in the elastic regime, i.e. run without affecting the injection wells. Re periodic measurements of water cut and bottom hole pressure in the production wells. When bottomhole pressure decrease of 5% or more from the originally measured values are produced up affecting the injection well and continue to control the change of the main parameters for water cut and bottom hole pressure in the production wells. The cycles repeat. As a result it is possible to reduce the water-cut reservoir production and increase oil recovery reservoir 2% from 34 to 36%.

Application of the proposed method will allow to increase oil recovery of the reservoir.

The way you design the dome of an oil Deposit in the final stages of operation, including the selection of reservoir production through production wells and the injection of working agent through injection wells, characterized in that choose the local site of deposits according to the hypsometric difference of marks between at least one upstream and at least one injection well in an amount of from 3 m and more, in the extractive squag�not produce a replacement for the standard pumping equipment pumping equipment with the possibility of operation time during the day, when it detects changes in the water content of 10-15% produces a limit on the amount of recoverable products produced by changing the operating time of pumping equipment during the day, on a site of injection wells produce restriction injection, or a complete shutdown of the well, produce periodic measurements of the change of operating mode of producing well by watering, by reducing the water content continue operating in the elastic regime run without affecting the injection wells, re-produce periodic measurements of water content and changes in downhole pressure in a producing well, the bottomhole pressure decrease by 5% and more from the originally measured values produce the injection well and continue to control the change of the main parameters for water cut and bottom hole pressure in the production wells.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: during development of multilayer oil deposit working fluid is injected through injectors with common well screen. Extraction of the reservoir product through producers is also performed with common well screen. The upper layer is developed in the mode of injection to withdrawal ratio by injection of working fluid at discharge pressure according to injectivity of the stratum. A pit is arranged close to the injector and working fluid is pumped through this pit to the injector with increased injection pressure sufficient for entry of working fluid both to the upper and lower strata. Producers are operated in the mode of permanent bottomhole pressure. Upon reaction of the producers to increased pressure of working fluid injection the development is continued in the mode of injection to withdrawal ratio by injection of working fluid. Injection to withdrawal ration is redistributed for two strata simultaneously from producers with high water cut and high bottomhole pressure to producers with low water cut and low bottomhole pressure. For this purpose at producers with increasing water cut operation time of pumping equipment is reduced at permanent bottomhole pressure. At producers with low water cut operation time of pumping equipment is increased at permanent bottomhole pressure.

EFFECT: improving oil recovery of the deposit.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: according to the method geophysical survey of exploratory wells is performed by crossed dipole shear sonic imager. Oriented core is selected with further determination of directions of natural fracturing. Regional directions in maximum stress of oil-saturated rock are defined. According to findings injectors are placed along the regional directions in maximum stress. Producers are placed in between injectors thus forming developing method. Part of injectors occurred in fault zones and closer than 200m is introduced into operation as producers with their further transfer to injectors. When watering is higher than break even point and when it is required to maintain reservoir pressure at the deposit producers are transferred to injectors. Transfer of wells is made so that they form rows of injectors step by step along regional directions in maximum stress of oil-saturated rock and provide even oil displacement.

EFFECT: increased reservoir recovery due to more efficient and sound placement of well pattern within the area of oil deposit considering tectonic and geomechanic conditions of pay rocks occurring.

3 cl, 3 tbl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil industry and can be used for enhanced oil recovery of the reservoir in the development of water-flooded reservoirs with viscous oil and bitumen at a late stage of development. The method comprises opening the reservoir with the ability to transfer the production well into the injection one, the reservoir processing, keeping the hole without any influence, intake of oil from the reservoir. At that a system of microwave electromagnetic generators with radiation frequency of 2.5 GHz is lowered into the injection well, connected to the slot antenna using the feeder. The length of the slot antenna is selected equal to the thickness of the aquifer of the reservoir. In the mode of injection, the water injection into the reservoir is carried out with simultaneous influence on the reservoir with microwave electromagnetic field, the radiation power is determined by the time of heating of the water injected in the downhole to the desired temperature. When filling 5-10% of the volume of the pore space of the formation, the well is maintained, the well is transferred into the production well, and the liquid intake from the production well is carried out.

EFFECT: increase of the effectiveness and economical efficiency of development of water-flooded reservoirs of high-viscosity oil, intensification of oil production in water-flooded reservoirs of high-viscosity oil by increasing the coverage with influence to the reservoir with heating in the bottomhole area of the reservoir of the production wells.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: under this method the field is drilled according to row system with triangle grid of wells. Work agent is injected in the injection wells. Oil production is performed from production wells. At initial stage of the field development the production reservoir is presented by two horizons, if divided by central separating row of injecting wells with spacing between wells at least 300 m. Central separating row is arranged along line of maximum pay structure, the injection wells in it are made with opening by common filter of the both horizons. The closest first row of the production wells is drilled at distanced from the central row at least 500 m. Other areas of the reservoir are drilled with spacing between wells 300-400 m. After injection of the central row of the injection wells to 0.4-0.7 unit fractions of the pore volume to nearest rows of the production wells at least 90% wells of the central row are shutdown. After oil withdrawal at the entire field to 90% of initial oil productive capacity between the central separating row of the injection wells and nearest row of the production wells the sealing row of the production wells is drilled. Wells of the central row are switched to production at top horizon. During watering of the production wells of the first row to 98% they are switched to water injection.

EFFECT: increased oil recovery factor of the field.

2 ex, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: under method the first device is installed in the horizontal well. Firth fluid is injected in the first horizontal well via the first device. HCs production is ensured from the second horizontal well under the first well. Second fluid is injected to the third well shifted to side from the first and second wells to displace fluids in the reservoir to the second well. At that HC production from the second well is continued. Hydraulic connection is ensured between the first, the second and the third wells. Pressure in the first well is increased using the second fluid injected to the third well. First well is closed when its pressure is increased by the second fluid to pressure sufficient to displace HCs from the second well during HCs production.

EFFECT: increased method efficiency.

29 cl, 10 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves construction of horizontal producers covering the field, and horizontal injectors. Displacement agent is injected through injectors, and products are swept by producers. Horizontal production wells are arranged parallel to each other. Horizontal injector is positioned between horizontal sections parallel to them. Injection starts from bottomhole. When intake capacity of reservoirs is decreased at the bottomhole of horizontal injector to minimum profitable level, non-operating section of horizontal shaft is isolated in series in direction from the bottomhole to the beginning of horizontal injector wellbore. Horizontal producers are drilled in permeable interlayer at 3-6 m distance below the reservoir bottom and at least at 10 m distance above oil-water interface. Horizontal injector is equally spaced from horizontal sections of producers by a design pattern distance. Displacement agent is injected with reservoir pressure rise by 10-20% compared to recovery zone. After time period sufficient to recover and stabilise frontal zone of liquid injected to the reservoir, operation may return to previous intervals. Horizontal sections of producers are broached in two intervals at a distance preventing hydrodynamic connection of the wells. Products are recovered in turns. Production intervals are switched when products reach minimum profitable water cut level.

EFFECT: increased oil recovery due to stabilisation of frontal zone of liquid injected to reservoir, extended application scope of horizontal wells in various field development conditions.

6 dwg, 1 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to the oil-producing industry, in particular to oil field development with flooding. According to the method the displacement agent is injected and oil is withdrawn through the system of injection and production wells. The flooding mode is changed during the development. The displacement agent is injected into the injection well in intensive mode. Using the surface measuring instruments that are a part of an automated process control system the change of extracted oil volume growth depending on the displacement agent injection volume growth until the moment of fast drop of the extracted oil volume is monitored in real time. Then the displacement agent injection volume after which the named drop occurred is recorded. Further injection into the injection well is performed in the volume below this pre-set value.

EFFECT: decrease of labour input of control of oil field flooding process during injection of the displacement agent into injection wells.

1 ex, 6 dwg

FIELD: oil and gas industry.

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EFFECT: increased efficiency of clusters well control.

2 cl, 1 dwg

FIELD: oil-and-gas industry.

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EFFECT: higher process efficiency.

3 cl, 1 dwg, 1 ex

FIELD: oil-and-gas industry.

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EFFECT: higher efficiency of stationary pulse injection of fluid.

2 dwg

FIELD: oil and gas production.

SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher oil yield, higher effectiveness.

5 cl, 3 dwg

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

1 ex

FIELD: oil industry.

SUBSTANCE: according to first variant of method, force and product wells are drilled, working agent is fed through force wells, oil is extracted through product wells, dome-like raised portions are marked out, which surpass absolute marks of bed, additional wells are positioned in these portions. Wells placement is planned at tops of dome-like raised portions even with breach of evenness of planned well mesh. After full drilling of wells mesh and in case of more accurate definition according to data of drilled wells of deposit of dome-like portions side shafts are drilled from adjacent wells towards more precisely defined tops of dome-like portions, controlling the deposit. In adjacent wells and side shafts, positioned on tops of dome-like raised portions , range of productive bed is opened between absolute mark of ceiling in this well and absolute mark, appropriate for ceiling in closest well. According to second variant of method practically analogical operations are realized as in first variant, except when absolute mark of ceiling of productive bed according to adjacent wells is lower than mark of sole of productive bed, whole bed is opened in side shafts.

EFFECT: higher efficiency.

2 cl, 2 dwg

FIELD: oil reservoir development, particularly for developing water-flooded ones.

SUBSTANCE: method involves withdrawing oil through production wells and ejecting working substance through ejection wells. To prevent water ingress from well bore into oil-saturated formation area formation is perforated in water-oil interface zone so that lower part of oil-saturation formation interval and upper part of water-flooded formation interval are penetrated. This provides oil relative permeability retention in oil-saturated formation area. To prevent formation mudding during initial perforation thereof drilling is performed in depression, balance and repression modes with pressure of not more than 3 MPa. As far as oil is depleted perforation interval is extended towards oil-saturated formation area.

EFFECT: possibility to retain oil relative permeability of oil-saturated formation area.

2 cl, 2 dwg

FIELD: oil field development, particularly for ones with nonuniform reservoirs.

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EFFECT: improved oil recovery.

2 dwg, 1 ex

FIELD: oil industry.

SUBSTANCE: method includes drilling vertical product and force wells, extracting oil from product wells, forcing working agent through force wells, making side horizontal shafts in force wells, forcing working agent through side horizontal shafts of force wells. Additionally, side horizontal shafts are made in extraction wells. Oil is taken through side horizontal shafts of extractive wells. With pressure in the well, decreased for 5-10% from hydrostatic pressure, all side horizontal shafts are made by washing away rock under pressure of fluid of around 15-20 mPa. Direction of all side horizontal shafts is set to be parallel to rows of wells.

EFFECT: higher oil yield.

1 ex, 1 dwg

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves drilling production and injection wells and maintaining formation pressure; performing seismic works to determine volumetric routing of natural macrocrack system with lateral and depth routing; forming production and injection macrocracks of above system; drilling wells to corresponding macrocracks and forming producing well-macrocrack systems for oil production and injection well-macrocrack for formation flooding or production well-macrocrack for oil production and system including vertical and/or horizontal multibranch wells for formation flooding or injection well-macrocrack system for formation flooding and system including vertical and/or horizontal multibranch production wells for oil production or production well-macrocrack system, injection well-macrocrack system and system including vertical and/or horizontal multibranch production and injection wells.

EFFECT: increased efficiency, oil recovery and production well injectivity, as well as increased sweep efficiency and oil recovery ratio.

1 dwg

FIELD: oil production industry, particularly oil deposit development.

SUBSTANCE: method involves pumping working agent, namely water, in two stages. The first stage is performed with the use of power pumps. The second one is carried out by means of hydraulic measuring pumps, which are used to convert injection pressure created by power pumps. If it is necessary to increase pressure in water lines used to deliver water to separate injection wells pressure is regulated in accordance with necessary water volume to be injected in wells on the base of collecting properties of oil formations in bottomhole formation zones. This is performed by providing change in pump piston diameter and stroke ratios in the first and the second sections of hydraulic measuring pumps, which are selected on the base of hydraulic resistance variation depending on water flow velocity. Parameters characterizing injection system operation are simultaneously measured and efficiency of the method and equipment operation is detected from above characteristics.

EFFECT: increased efficiency of oil bed development due to energy-saving equipment and technique usage for formation pressure maintaining.

2 cl, 2 dwg

FIELD: enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves flooding production bed through injection wells with the use of pump units. In the case of terrigenous porous productive bed flooding acoustical sound resonators with resonance frequency setting are installed in injection line. This eliminates amplitude of alternating low-frequency liquid pulsation sound generated by pump units. Method also involves providing constant compression mode in productive beds and frontal oil drive from productive bed.

EFFECT: increased operational reliability.

1 ex, 3 dwg

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