The way of the development of oil deposits

 

The invention relates to the oil industry, and in particular to methods of developing the oil fields developed with reservoir pressure maintenance by water injection into the reservoir through injection wells. Provides increased waterless period of oil production and increase the current oil recovery factor. The inventive method involves drilling reservoir production and injection wells, the implementation of the perforation of the productive formation into the producing wells in two phases, the injection of water through injection wells and oil extraction through production wells. According to the invention in accordance with the positioning grid wells determine the position of the faces of producing wells in the local area dome uplift in local depressions. At the first stage when you hit the bottom of the production well in the local area of the basin produce perforation of the production well in the interval of the plantar part of the productive formation. When you hit the bottom of the production well in the local area dome uplift produce perforation of the production well over the whole range of the thickness of the reservoir. In the second stage proizvodjacima, upon reaching their watering up to 50% and above. In producing wells within the area of the local dome rises, make the isolation of the plantar part of the productive formation. 1 Il.

The invention relates to the oil industry, and in particular to methods of developing the oil fields developed with reservoir pressure maintenance by water injection into the reservoir through injection wells. Can be used in linear, block-closed and areal systems.

There is a method of developing a petroleum reservoir with bottom water and deterioration of permeability to the roof, providing geophysical surveys, the selection in the borehole sections all layers of impermeable rocks, mapping the distribution of each of them, the implementation of the perforation of wells, producing wells perforation is produced above the starting position of the oil-water contact (OWC), the injection of water through injection wells, sampling of formation fluids through mining. In the process of development of deposits monitor the movement of KSS and achievement of design degree reserves in savedname of the reservoir to rot ways to use fields with plantar water;

the method does not provide measures providing premature breakthrough of injected water in the most permeable layers, which can be located in the upper part of the reservoir, and in the middle or the bottom, which leads to the unpredictability of the nature of the flooding of productive thickness of layer (uneven coverage of the reservoir water flooding), resulting in flooding of the reservoir are formed pillars oil (stagnant zones).

This leads to the reduction of anhydrous period of oil production, the values of the current and ultimate recovery factor of oil because the oil in the local dome uplift cannot be removed except by drilling additional wells.

There is a method of developing oil deposits, providing drilling reservoir production and injection wells, the development of deposits in two phases, the injection of water through injection wells and the sampling of fluids through extracting, at the first stage produces an autopsy prikrovatnoj part of the productive formation perforation interval equal to half the thickness of the layer, in the second phase when reaching the bottom waters of the wells in them produce the opening of the reservoir at full Titanic deposits with plantar water;

- carrying out the first stage of the development of reservoir with bottom water perforations in the producing wells in the roof of the reservoir in the interval of 0.5 h, where h is the saturated thickness of the formation, promotes the formation of stagnant zones in the flooding of the reservoir, which reduces the current oil recovery factor and effective development;

- insignificant time waterless period, due to the breakthrough of injected water in the most permeable layers, and then in the second stage, the opening of the reservoir at full thickness leads to an increase in the rate of water production wells and thereby reduces the current and final oil recovery and reduces the efficiency of the development.

The objective of the invention is the expansion of the use of the method for the development of pure oil fields, and fields with plantar water using linear, block-closed and areal systems, increasing the waterless period of oil production, the increase of the current recovery.

The solution of this problem is achieved in that in the method of developing oil fields, including drilling reservoir production and injection wells, atelinae wells and oil extraction through production wells, according to the invention in accordance with the positioning grid wells determine the position of the faces of producing wells in the local area dome uplift or in the local area of the trench, and the first step when you hit the bottom of the production well in the local area of the basin produce perforation of the production well in the interval of a bottom part of the reservoir, and when you hit the bottom of the production well in the local area dome uplift produce perforation of the production well over the whole range of the thickness of the reservoir, the second stage produces a perforation of the roof part of the productive formation into the producing wells within the area of the local depression, when reaching their watering up to 50% and above, in producing wells within the area of the local dome rises, make the isolation of the plantar part of the productive formation.

The essence of the method is that the selection of intervals of the perforations in the producing wells in the formation of the flooding system is carried out in dependence on the position of the faces of producing wells on the structure so that the direction of filtration flow of the injected water and extracted oil to the mining and milling faces the direction of filtration. This is achieved rapid filling of a local depression of the injected water and the intensification of extraction of oil producing wells in the area of the dome raising.

In collaborative filtering, oil and injected water last moves not only in the direction of the filter from the injection wells to mining, but also under the action of gravity goes down. The displacement front of the injected water is homogeneous and has a tendency rapid progress towards a bottom part of the layer that corresponds to the observed facts ahead flooding the plantar part of the production wells [3]. This feature filtering of injected water contributes to the creation of stagnant zones in the process of oil displacement by water. This implies that the injected water is necessary to pull up from the soles of the production well to its roof by directional changes of the filter thread, which is achieved by appropriate choice of the perforated interval of the production well.

However, the placement of the wells produce structural map layer representing deposits of platform type or the contact reservoirs with bottom water, or a combination of local dome uplift and razlichnoi density.

The drawing shows the reservoir 1, is represented by alternation of zones of local dome uplift 2 and local depressions 3 posted by production and injection wells 4 wells 5, the perforation intervals in wells, isolation intervals, operating in the filtration process forces: the hydrodynamic force F in the direction of the filter from the injection wells to the mining and aimed downward gravitational force G. the Injected water from the bottom of injection wells 5 and selected reservoir oil under the action of the resultant of the forces F and G are filtered in the space of a productive layer 1 as two immiscible fluid to the faces of producing wells 4. However, due to the difference of densities filterable phases of the injected water under the action of gravitational force G is lowered down the section of the reservoir, contributing to the stratification of the phases of the slit, whereby the irrigation wells comes from below. In this regard, the injected water should be tightened to the roof of the productive formation as its filter. This is achieved by changing the direction of filtration flow through the choice of the perforation intervals of producing wells based on their location at depth sabadini. In addition, the forces F and G near the bottom of wells are formed stagnant zones due to the fact that their resultant power filter is directed to the bottom layer.

The method is implemented as follows. In accordance with the positioning grid, producing and injection wells determine the position of the faces of producing wells in the local area dome uplift in local depressions. Then on the first stage produces a perforation wells 4, located in the area of local depressions 3, in a bottom part of the reservoir and perforated wells 4 in the local area dome raising 2 produce throughout the thickness of the reservoir. In this case produces a stagnant zone of the production well in the local area of the basin, its bottom portion and partially stagnant zone near the injection well.

Thus, the first step of the method contributes to the tightening of injected water to the sole production wells located in the area of local depressions, and thereby provides additional preemptive effect by preventing the formation of stagnant zones, and filtering of injected water to the producing wells in the area of the dome lifting is retarded and is it well local domed raise.

In the second phase when reaching the water cut of 50% or more producing wells within the area of the local depression, produce a perforation roof of the reservoir, i.e., perform a full autopsy (destrel) productive formation thickness, and producing wells in the local area dome uplift isolated plantar part of the reservoir in a known manner.

At this stage, the perforation through the entire thickness of the layer of the production well in the area of local depression and isolation plantar part of the production well in the local area dome uplift create additional conditions for pull-pumped water up, smoothing the front of displacement of the injected water in the whole reservoir section in the area of flooding.

Perforation of the injection wells is carried out in accordance with the decisions of the project document during the formation of the flooding.

For the generation of stagnant zones oil reservoirs platform type stages 1 and 2 alternate through one production well. Contact oil reservoirs with bottom water before carrying out steps 1 and 2 provide isolation of bottom water by the method of reverse cone reservoir oil. When using the method on mespa 1 and 2 implement in conjunction with insulating events flooding intervals using forced fluid extraction.

A specific example of execution.

The method is implemented in the North-Pamalican field, located in the Purovsky region Tyumen region. The field is characterized by the presence of local depressions concentrated to the center of the Deposit and the local dome rises are located towards the boundaries of the deposits. Industrial oil content associated with reservoirs EC110and BS11.

Drilling production facilities BS110and BS11performed on triangular meshes that are offset relative to each other, with the distance between the wells 500500 m, the drilling of all wells produced with the opening of the reservoir BS11.

In accordance with the grid drilling on the development objects BS11and BS110were divided into six wells, including four production wells№№ 533, 157, 514, 140, located in the local area dome lifting with depth marks on the roof from within 2672-2691 m, and two production wells No. 522, 536, located in the area of local depressions with depth marks on the roof from within 2658-2662 M. Perforation of these four wells produced productive throughout the thickness of the reservoir, and two Dobychina put into operation. To achieve 50% of the water in producing wells No. 522, 536, located in the local depression, manufactured costrel (performed by the perforation of the roof part of the productive formation), and in producing wells No. 533, 157, 514, 140 carried out isolation in a bottom part of the productive formation. Well exploit more than two years. During this time period waterless operation in wells located in the zone of the local dome uplift, based on conducted isolation increased 85-115 days. For wells located in the zone of the local basin, additional anhydrous period averaged 45 days. When conducting Doctrina well No. 522, 536 marked reduction of water production from 60% to 15% with further increase of the rate of water content not more than 7% per year. During the observed period, the wells of additional oil production per well averaged 3777 t, and additional production in the whole six wells was 22663 t, which increased the current recovery compared to the average current oil recovery factor by 0.12%.

The effect of the application of the proposed method is achieved by increasing the waterless period production is 43/20, 1992.

2. A. C. the USSR № 1811244, E 21 In 43/20, 1990 prototype.

3. The Muliavin C. F., Prince, R. I. and other Method of forecasting oil and water, taking into account their gravity separation when moving in formation. //Oil and gas No. 3, Tyumen, 1999, S. 30-36.

Claims

The way of the development of oil deposits, including drilling reservoir production and injection wells, the implementation of the perforation of the productive formation into the producing wells in two phases, the injection of water through injection wells and oil extraction through production wells, wherein in accordance with the positioning grid wells determine the position of the faces of producing wells in the local area dome uplift or in the local area of the trench, and the first step when you hit the bottom of the production well in the local area of the basin produce perforation of the production well in the interval of a bottom part of the reservoir, and when you hit the bottom of the production well in the local area dome uplift produce perforation of the production well over the whole range of the thickness of the reservoir, the second stage produces a perforation of the roof part of the productive formation into the producing well is x wells, located in the local area dome rises, make the isolation of the plantar part of the productive formation.

 

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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.

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FIELD: oil and gas extractive industry.

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EFFECT: higher oil yield, higher effectiveness.

5 cl, 3 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of deposit according to row-wise non-even grid of wells with distance from force to extractive rows, greater than distance between extractive rows, pumping of displacing gent into force wells, extraction of product from product wells and transferring of displacing agent pumping front to extraction area. According to invention, transferring of displacing agent pumping front to extraction area is performed by drilling side horizontal shafts in all wells of force row and directed towards extractive row by beds ad zones with most remainder oil saturation level. Then among these wells are singled out, horizontal shafts of which pass along beds and areas with lesser oil saturation level. Pumping of displacing agent is restarted, and other wells are transferred to product category. These wells are operated with face pressures lower than saturation pressure until reaching 98% water saturation level. After that pumping of displacing agent is restarted along all other wells of force row. During that, rows of extractive wells are operated in normal mode.

EFFECT: higher efficiency.

1 ex

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EFFECT: higher efficiency.

2 cl, 2 dwg

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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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