The way of the oil field development

 

The invention relates to the oil industry, in particular to the development of oil fields with the use of horizontal wells, and can be used in the development of deposits with moving the bottom hole. Provides increased ultimate recovery as a result of repeated opening oil deposits, reduction of material costs of oil production due to reduction of drilling wells and convergence in one horizontal production well of a function of several vertical wells, as well as extend the operation of the horizontal production wells through the insulation watered productive intervals without interrupting the operation of the well. The method involves the drilling of a field system of vertical injection and horizontal production wells with a selection of their trajectories, the injection of the displacing fluid and oil. According to the invention the trajectory of horizontal wells is determined by the alleged connection faces of vertical producing wells in row layout. Have the beginning of a horizontal shaft in the compression zone. The end of the barrel come in at a number of upstream scariola in the reservoir. As the front moved water in the process of developing the bottom of horizontal wells move to the garter zone through a phased shutdown intervals crossing the productive layers. 3 Il.

The invention relates to the oil industry, in particular to the development of oil fields with the use of horizontal wells, and can be used in the development of deposits with moving the bottom hole.

There is a method of developing oil fields (see U.S. patent 4718485, CL E 21 In 43/24, 43/30 from 21.01.1988, including the drilling of producing horizontal and vertical production and injection wells under the scheme, providing for the placement of horizontal wells between the vertical producing wells in the plane coinciding with their axes.

The advantage of this method is that it allows you to extract oil from stagnant zones between the vertical producing wells.

The disadvantage of this method is the low recovery factor due to insufficient coverage of drainage layers in thickness and area of the subject development.

The closest in technical essence to offer uribana field system of vertical injection and horizontal production wells with a selection of their trajectories, the displacement of oil and product selection. The choice of the trajectory of horizontal wells is carried out by connecting the points located on a uniform grid. The beginning of a horizontal wellbore in a series of wells adjacent to the rows of injection wells located at a distance greater than the distance from its end to the injection wells. The middle and the end of the horizontal shaft have the same distance from the injection well.

The advantage of this method is that it allows you to increase the oil recovery factor in multilayer fields due to more uniform drainage.

The disadvantage of this method is that it is only suitable for multilayer deposits with independent grids, and each horizontal well reveals the reservoir once.

The technical objective of the proposed method is to increase the ultimate oil recovery as a result of repeated opening oil deposits, reduction of material costs of oil production due to reduction of drilling wells and convergence in one horizontal production well of a function of several vertical wells, as well as the extension operation of the well.

This task is solved by the described method, including the drilling of the Deposit system of vertical injection and horizontal production wells with a selection of their trajectories, the injection of the displacing fluid and oil.

What's new is that the trajectory of horizontal wells is determined by the alleged connection faces of vertical producing wells in row layout, have the beginning of a horizontal shaft in the compression zone, and end at the number of producing wells closest to the discharge line, and having multiple opening deposits by input and output shaft in the reservoir, and as the front moved water in the process of developing the bottom of horizontal wells move to the garter zone through a phased shutdown intervals crossing the productive layers.

The execute method is carried out on the basis of improving the standard row layout of wells by replacing multiple vertical wells one horizontal well placement in the reservoir so that the barrel horizontal wells repeatedly opened producting barrel is placed in compression zone, and end at the number of producing wells closest to the discharge line, and, as progress in front of the water cutoff intervals of the intersection of productive layers, starting with the end portion of the barrel. The set of distinctive features allows you to get a reduction in capital expenditures for the drilling of one horizontal well in the amount of 5 million rubles, the increase in average annual economic effect of horizontal wells on 9,65 million rubles and the extension of the life of the well for 7 years.

In Fig. 1 shows the layout of producing horizontal and vertical injection wells for the proposed method, Fig.2 - section wells 1-2n profile horizontal wells on the proposed method.

The method is carried out in the following sequence.

Oil field razvarivat vertical injection wells (1H-6N) on a sparse grid. This allows you to update the geological structure of the Deposit and to plan the placement of horizontal wells. According to the study of vertical wells to determine the number of layers, their productivity and reserves. Then Buryats vertical and horizontal mining SLE is that wells with the location of the beginning of the horizontal shaft in the compression zone (point 1, 3, 5, 6), and the end of the last row, closest to the discharge line (point 1", 3", 5", 6"), and spend it with multiple opening deposits by entry and exit into the reservoir.

Such wells allows you to repeatedly open the productive layers of oil deposits, which is equivalent to seal the well grid, as well as by reducing the number of wells and combining in a single horizontal well of a function of several vertical wells is a reduction of material costs on oil production.

In the process of developing the irrigation wells begins with the end portion of the barrel closest to the discharge line. For the case with a vertical bore flooding leads to the cessation of its work. In the case of a horizontal well drilled on the proposed method, the flooding does not stop well, as it only requires isolation of the flooded part of the productive interval by injection into the end part of the barrel is pre-calculated amounts of obstructive material (e.g. cement). After the flooding of production horizontal well portion of the wellbore in the reservoir, located on the site of the wells of the first row from the injection wells, isolated from about where the focus of residual oil, due to this lengthens the life of the well and, as a consequence, increases the oil recovery. After the flooding of the next interval it off the same way.

An example of a specific implementation.

Develop a heterogeneous oil reservoir with the following parameters: the average porosity of the cut - 11,9%, the average permeability of the cut - 0,029 μm2the saturation - 61,6%, absolute mark oil-water contact - 870 m, the average net pay thickness -4 m, the initial reservoir pressure is 7 MPa, reservoir temperature - 25oWith the parameters of the reservoir oil: density of 930 kg/m, a viscosity of 46 MPaC, the saturation pressure of 1.8 MPa, gas content - 15.2 m3/so

On the site of the Deposit placed injection wells in two rows. Between the rows of injection wells planned placement of production wells five rows. From the compression zone to the discharge line planned drilling of horizontal wells on the proposed method. One horizontal well reveals a layer at three points, superseding drilled three vertical wells. Horizontal wellbore is carried out with a multiple opening deposits by input and output trajectories of the barrel in produktionsplanung. For horizontal wells depression on the formation supported not more than 1 MPa to avoid pulling the injected water to the face.

After several years of operation after the front passes through water watering horizontal wells increased to 92%. According to research well was determined that obwodnica productive interval closest to the discharge line. After cutting off the end portion of the barrel watering wells decreased by 58% and amounted to 34%. At the same time, horizontal well with a straight trunk, located on the same site of the Deposit, continued to work with the same water content and in the next five years, fully bodylase, after which it was stopped. Thus, flooding of horizontal wells drilled by the proposed method and repeatedly exposing the reservoir, unlike a horizontal well with a straight trunk, did not cause her to stop.

In Fig.3 shows the displacement characteristics for areas of oil: curve 1 - without the use of the proposed method of development, curve 2) with the use of the proposed method. When comparing them, it is becoming clear that perimentally well with straight trunk amounted to 11 years, while for horizontal wells on the proposed method with multiple opening deposits - 18 years. The flow rate of a vertical well was drilled to 4 tonnes, horizontal wells with rectilinear barrel - 10 t/d, horizontal wells with multiple opening deposits - 13 tonnes.

Capital expenditures for drilling vertical wells amounted to 5 million rubles, on the drilling of horizontal wells - 10 million rubles reduction in capital expenditures during the drilling of one horizontal well instead of three vertical amounted to 5 million rubles Average annual economic effect of horizontal wells on the proposed method is higher compared to a horizontal well with a straight trunk to 3.22 million rubles, compared to a vertical well at 9,65 million rubles, for all the time work well for the proposed method obtained the profits from oil sales in the amount of 250,92 million rubles , well with a straight trunk - size 117,92 million rubles, vertical wells 47,19 million rubles

Technical and economic efficiency of the proposed method of development of an oil field is formed by increasing the ultimate recovery as a result of repeated opening of the reservoir horizontal well and about what prekrashenija work well.

Claims

The way of the oil field development, including the drilling of the Deposit system of vertical injection and horizontal production wells with a selection of their trajectories, the injection of the displacing fluid and the oil, characterized in that the trajectory of horizontal wells is determined by the alleged connection faces of vertical producing wells in row layout, have the beginning of a horizontal shaft in the compression zone, and end at the number of producing wells closest to the discharge line, and having multiple opening deposits by input and output shaft in the reservoir, moreover, as you move the water front in the development process, the bottom of horizontal wells move to the garter zone through a phased shutdown intervals crossing the productive layers.

 

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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.

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FIELD: oil and gas extractive industry.

SUBSTANCE: method includes construction of wells and oil and gas collection system, forcing water from water-bearing level into oil deposits, flow of oil from oil deposits into secondary deposit and following extraction of oil from secondary deposit for useful implementation. Resources of deposit are separated on basis of natural energy characteristic on screened and having rigid water-forcing mode. Deposit is operated by three well types. Of the latter flow wells connect oil deposits to secondary deposit for flowing and collection of oil in upper bed under effect from gravitation. Balancing wells connect screened deposits and secondary deposit to water-forcing level for balancing of bed pressures and preventing loss of rocks stability. Extraction wells connect secondary deposit to oil and gas collection system. Selection of bed for secondary deposit is performed from number of highly penetrable beds, having maximally allowed excess over oil deposits.

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

FIELD: oil industry.

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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

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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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