Method for extracting hydrocarbons deposits

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling product and force wells, forcing gas and water through force wells into separate zones of productive bed and extraction of hydrocarbons from product wells, forming separate gas, water and hydrocarbon saturated areas with major contents of respectively gas, collected therein for later use, water and hydrocarbons, periodical pumping of collected gas from formed gas saturated zones to water saturated zones, periodical pumping of water to gas saturated zones is performed. It is possible to pump collected gas to water saturated zones in form of gas-water mixture. It is possible to pump in passing gas of current deposit. It is possible to pump hydrocarbon or non-hydrocarbon gas from other sources. It is possible to pump water with admixture of specifically selected chemical reagents or compositions thereof. When gas content in water saturated zones reaches from 0.1 to 28% from water content in water saturated zones it is reasonable to generate resilient waves with frequency within range from 0.0001 to 45 KHz and amplitude within range from 0.02 to 2.8 MPa. It is reasonable to pump gas and water to separate areas of productive bed with concurrent generation of resilient waves in there with frequency within range from 0.0001 to 45 KHz and amplitude within limits from 0.02 to 2.8 MPa.

EFFECT: higher efficiency.

7 cl, 5 dwg

 

The invention relates to the oil and gas industry and can be used in the development of hydrocarbon fields.

In world practice there are two approaches to the development of hydrocarbon fields.

The first approach is typical for the USA, Canada, France, England and some other countries [1], consists in drilling field on a particular grid and its operation in the initial period by natural means. Then, as a secondary method of stimulation, applied gas injection, and later as a tertiary method, the injection of water. Before flooding is extracted up to 20-30% of the hydrocarbons from the initial recoverable reserves. The advantage of this approach is the reduction of the volumes of produced water. However, in this case the intensity of the selection of stocks is reduced to 2-3% per year.

The second approach characteristic of the former USSR [2, 3], is to implement the flooding of the field from the very beginning of its development, that allows to intensify the extraction of hydrocarbons up to 10% of the recoverable reserves.

The main disadvantage of this approach is the early water breakthrough in production wells, which entails a rapid flooding of the production and extraction of large volumes of water during mining, as well as an increase in the time of redevelopment.

<> Thus, before the oil and gas industry, the question of creating such methods and systems for development of hydrocarbon deposits, which would preserve the intensity of existing systems, however, would avoid rapid flooding of fields and production of large volumes of water. The volumes of water produced along with the hydrocarbons, often 2-3 times higher than the volume of extracted hydrocarbons. At the same time the question arises on the disposal of associated water. Because not all the water is pumped back into the reservoir and discharged into surface reservoirs, the question arises about the solution of global environmental problems.

Famous oil extraction method [4], including injection into the reservoir gas and water, which improves the efficiency of oil displacement by water on the area and vertical seam and reduce the residual oil saturation in the reservoir after water flooding in the presence of the gas phase compared to the flooding in the absence of free gas, especially in the hydrophilic rocks.

The disadvantage of this method is the high total water saturation, possible early water breakthrough in production wells.

A known method of oil extraction [5] by alternating the pressure in the gas reservoir and the gas mixture comprising the injection zone extraction primarily gas in the amount of 2-20% PE the new hydrocarbons to create the free gas phase. After the gas is joint and simultaneous injection of gas and water in amount approximately equal to the volume pumped up to this gas. The ratio of gas and water in the stream varies between 25-75%. Pumping a mixture of gas-water” provides a uniform advancement of the displacement front and allows to compensate the influence of the inhomogeneous structure of the collector.

The disadvantage of this method is the impossibility of flexible regulation of the promotion of the displacement front and possible premature breakthrough of injected agents in producing wells, as well as discards injected into the gas reservoir due to the lack of a separate gas-saturated zones and the possibility of their further development.

Famous oil extraction method [6] by displacing the gas in combination with the seismic excitation of low amplitude, including simultaneous with the injection into the reservoir of pressurant gas generation on the Earth's surface seismic energy for excitation in the reservoir seismic vibrations with a frequency of 0.1-500 Hz and an amplitude of not more than 100 And°. Seismic vibrations contribute to the flow of gas through the formation to the production well.

The disadvantage of this method is the high energy consumption due to the need of generating seismic energy on the surface of C the YPD and transfer it into the reservoir through the thickness of the earth, and early breakthroughs gas because of the impossibility of regulating the promotion of the displacement front in the reservoir. Seismic vibrations in the known method it is impossible to concentrate on the producing formation, with the excitation adjacent the productive formation aquifers, leading to uncontrolled promotion and possible breakthroughs produced water in producing wells. In addition, the intensity of the induced seismic vibrations when moving away from the Earth's surface is significantly reduced due to their attenuation and dispersion.

There is a method of hydrocarbon production [7], which includes the drilling of production and injection wells, the injection of gas and water in the reservoir and production of hydrocarbons.

The disadvantage of this method is the low recovery rate of hydrocarbons, a high degree of water content of the productive formation during development, breakthroughs in production wells gas and water due to unmanageable process of stabilization of the displacement front hydrocarbons. In addition, the disadvantage of the prototype is its low efficiency and high energy consumption per unit of production due to production of large amounts of water and gas with hydrocarbons and the need for economic costs of separation and degase the s vodoprivrednih emulsions, as well as the impossibility of disposing of produced gas from the very beginning of the development of the field.

As the closest analogue used method of hydrocarbon production, including drilling of production and injection wells, the injection of gas and water through injection wells in a separate zone of the reservoir and production of hydrocarbons from wells, creating a split between a gas-, water - and uglevodonasyschennye areas with a predominant content of the gas respectively, cumulative for later use, water and hydrocarbons, periodic pumping of accumulated gas from the generated gas-saturated zones in the saturated zone (RF patent No. 2047746, E 21 In 43/16, 10.11.1995).

The technical result of the invention is to provide such a method of development of hydrocarbon deposits, which allows you to control the advancing front of hydrocarbon displacement of the displacing agent in the reservoir while reducing the total water saturation of the reservoir, which increases the recovery rate of hydrocarbons from the reservoir leads to a decrease in the volume of produced water at the intensification of the rate of production of hydrocarbons.

The technical result is achieved in that in the method of field development using hydrocarbon is, includes drilling of production and injection wells, the injection of gas and water through injection wells in a separate zone of the reservoir and production of hydrocarbons from wells, creating a split between a gas-, water - and uglevodonasyschennye areas with a predominant content of the gas respectively, cumulative for later use, water and hydrocarbons, periodic pumping of accumulated gas from the generated gas-saturated zones in the saturated zone, produce periodic water injection into gas-saturated zones.

Perhaps the accumulated gas is injected into the saturated zone in the form of a gas mixture.

You can download the associated gas in this field.

It is possible to inject hydrocarbon or non-hydrocarbonaceous gas from other sources.

It is possible to inject water with the addition of specially selected chemicals or their compositions.

Upon reaching the gas content in water-saturated zones in the range from 0.1 to 28% of the water content in the saturated zone, it is advisable to generate elastic waves with a frequency in the range from 0.001 to 45 kHz and an amplitude in the range of 0.02 to 2.8 MPa.

Suitable gas, and water pump in a separate zone of the reservoir with the simultaneous generation therein of elastic waves with a frequency in the range from 0.001 to 45 kHz and amplitudes the range of 0.02 to 2.8 MPa.

The invention improves the recovery rate of hydrocarbons from the reservoir to reduce the development time deposits of hydrocarbons due to the intensification of the production process, to reduce the volume of produced water per unit volume of produced hydrocarbons, thereby increasing the energy efficiency of the process of production of hydrocarbons, to dispose of the main volume of associated gas recovered from the beginning of field development and subsequent use of associated gas for injection into water-saturated zone, improve the ecological situation in the area of the field.

The invention is illustrated by the following drawings, where:

figure 1 shows a diagram of the development of hydrocarbon fields, longitudinal section;

figure 2 shows a diagram of the development of hydrocarbon fields, view from above;

figure 3 shows the outline of the reservoir roof hydrocarbon deposits, longitudinal section;

figure 4 shows the outline of the massive deposits of hydrocarbons, longitudinal section;

figure 5 depicts the implementation of the method on the horizontal section of the productive formation.

(In the above schemes form lines location of wells in real reservoir can have any configuration that is different from the geometrical lines).

The method developed is key hydrocarbon is carried out as follows.

According to the results of geophysical studies, exploratory wells in the field of hydrocarbons define (specify) the dimensions and location of hydrocarbon deposits, followed by the drilling of production wells 1 (Figure 1), indicating the reservoir 4 with the surface 5 of the Earth. At the initial stage of all drilled wells are performing role mining. In the next step, taking into account the principle of selectivity determine the location of the number of drilled and the drilling of injection for gas and water wells 2, 3, respectively.

The gas injection begins at an early stage, and water at subsequent stages of development of the field after detailing the geological structure of the productive strata. By pumping gas into the injection well 2 and water in the injection well 3 in the reservoir 4 create a separate Autonomous zones 6, 7 with a predominant content of the gas, cumulative for later use, and water, respectively.

The creation of gas-saturated 6 and 7 saturated zones allows you to implement the process of displacement of the hydrocarbons in the reservoir 4 when the reduction of the total water saturation 4 compared with the case of pumping water only.

Between zones 6 and 7 are enclosed uglevodonasyschennye zone 8. Created gas-saturated and water-saturated AOR is s 6, 7 create fronts (STC, KSS) 9 displacement of the hydrocarbons in the reservoir 4. Extraction of reservoir hydrocarbons from zones 8 are produced through production wells 1.

Depending on the geological structure and the geometric dimensions of hydrocarbon deposits mining 1 (Figure 2) and gas injection wells 2 and water injection wells 3 can be selectively, for example rows of square fields, or to form other geometrically irregular shape of the line. Created by injection of gas and water in the rows of wells 2, 3 gas 6 and 7 saturated zone divided the field into separate zones in the horizontal plane, between which are enclosed uglevodonasyschennye zone with 8 rows of wells 1. The result is reduced total water saturation of the reservoir 4 (figure 1) compared with the case where could join would only water in all injection series, while maintaining the intensity of the process of displacement of the hydrocarbons in the reservoir 4.

In hydrocarbon reservoir dome type gas 6 (3) and saturated zone 7 can divide the reservoir 4 existing lines, GOC and OWC in the vertical plane.

In hydrocarbon reservoirs massive type of gas-saturated zone 6 (Figure 4) and water-saturated zone 7 can divide reductively layer 4 lines, GOC and OWC in a vertical plane, and, as a rule, the gas injection are in the upper part, and water in the lower part of the productive formation 4.

To prevent premature breakthrough of pumped water from zones 7 producing wells 1 produce periodic injection accumulated in zones 6 gas in the saturated zone 7 through water injection wells 3, thereby it is possible to manage the promotion of the front 9 of the displacement of the hydrocarbons in the reservoir 4 while reducing the total water saturation of the productive layer 4. In some cases, instead of the periodic pumping of gas are injected gas mixture in the saturated zone 7.

To prevent premature breakthroughs pumped gas from zone 6 in production wells 1 and improving the management of the promotion of the front 9 of the displacement of the hydrocarbons in the reservoir 4 produce periodic water injection into gas-saturated zones 6 through the gas-injection wells 2.

For injection may be used associated gas in this field. This allows you to temporarily preserve the produced associated gas from the beginning of the development of the field for later use.

For injection may be used for any other hydrocarbon or non-hydrocarbonaceous gas from other sources, such as nitrogen, flue gas, carbon dioxide, air or mixtures thereof. This allows visit the flexibility of the system development of the field, and also be used for injection into wells 2, 3 cheap non-hydrocarbonaceous gas with limited resources hydrocarbon gas.

For injection may be used as produced water or water from other sources.

In some cases, periodic injection of water into the gas-saturated zone is in the form of a gas mixture.

To download you can use water with the addition of specially selected chemicals or their compositions, which allows to stabilize the front 9 of hydrocarbon displacement and to increase the rate of displacement of hydrocarbons.

For regulating the advance of the front 9 of the displacement of hydrocarbons reaching the contents pumped gas in water-saturated zones 7 in the range from 0.1 to 28% of the water content in the saturated zone 7 may generate elastic waves 11 (Figure 5) in the saturated zone 7 with a frequency in the range from 0.001 to 45 kHz and an amplitude in the range of 0.02 to 2.8 MPa.

When the gas injection in the saturated zone 7 in terms of generating elastic waves 11 formed gas inclusions are secondary sources of elastic waves, amplifying the generated elastic waves 11. It allows you to partially compensate for the loss of energy of elastic waves 11 on the dispersion and stabilize the front 9 of hydrocarbon displacement at a great distance from wogonin the test wells 3. The result is the ability to control the advancement of the front 9 of the displacement of hydrocarbons with water almost up to the front of the 9 wells 1.

When the values of gas content in water-saturated zones 7 less than 0.1% of water content in zones 7 is the complete dissolution of the gas in water and thus eliminates the formation of secondary sources of elastic waves 11.

When the values of gas content in water-saturated zones 7 more than 28% of the water content in these zones form a gas cavity is increased in size, which is the local absorbers generated elastic waves 11.

The gas injection and water injection wells 2, 3 may be carried out with the simultaneous generation in the reservoir of elastic waves 10, 11 (Figure 5) with a frequency in the range from 0.001 to 45 kHz and an amplitude in the range of 0.02 to 2.8 MPa.

When using elastic waves 10, 11 within the specified limits implemented mode nonlinear resonance, characterized by the impact on the reservoir 4 close to any of its own frequency elastic waves. Under this regime, the impact on the productive layer 4 substantially increases the filtration rate of the hydrocarbons in the reservoir 4 and creates the possibility of obtaining between each pair of zones 6 and 8, 7 and 8 managed stable front 9 of hydrocarbon displacement is atom and water.

When the frequency of elastic waves less than 0.001 kHz and 45 kHz impossible to obtain the mode nonlinear resonance, since the natural frequencies uglevodorodyonogo layer, in most cases (it is known from practice) are in the range from 0.001 to 45 kHz.

When the amplitude of the elastic waves less than 0.02 MPa power fluctuations is insufficient to overcome the forces holding the hydrocarbons on the walls of the capillaries of the productive layer 4, and the coefficient of extraction of hydrocarbons is low at high specific volumes of the injected gas and water.

When the amplitude of the elastic waves more than 2.8 MPa dramatically increase energy costs for the excitation of vibrations and, consequently, unreasonably increase the economic costs of implementing the method. In addition, the probability of destruction of the walls of the injection wells 2, 3, leading to clogging of the reservoir, the decrease in performance of injection wells and, as a consequence, the impossibility of implementation of the process of displacement of hydrocarbon gas and water in the reservoir 4.

Generators of elastic waves 12, 13 (5) is placed in the perforation zone gas-injection 2 and 3 water injection wells on the column tubing (tubing). Used generators elastic waves 12, 13 eddy, hydraulic, hydraulic shock, fur the technical, imposing or electric type, which allow to obtain the elastic waves with the desired operating frequencies and amplitudes in the range of 0.001-45 kHz and 0.02-2.8 MPa, for example, described in [10].

The use of the claimed process of the development of hydrocarbon deposits allows to achieve the following technical advantages:

1. The shortening of the development of the field due to the intensification of the production of hydrocarbons.

2. The increase of the coefficient of extraction of hydrocarbons and increased coverage of the reservoir effect.

3. Reduction of total water saturation.

4. The reduction of the volume of produced water per unit volume of produced hydrocarbons.

5. The possibility of regulation of the promotion of the displacement front.

6. Utilization of the main volume of associated gas recovered from the outset of development, followed by its use for re-injection in the saturated zone, and for other purposes.

7. The method does not require creation of a new technical means.

SOURCES of INFORMATION

1. Sekachev NR. Development of oil fields pradha Bay. - Oil economy, 1984, No. 12, S. 69-72.

2. Vakhitov GG, sultans S.A., Onoprienko's VP design Principles Romashkinskoye oil field and their implementation. - In the book: Geology, exploration, drilling the oil in proc. Tatnai, vol. 3. - Bugulma, 1961, S. 235-247.

3. Sekachev NR. Tasks generalization of field experience and analysis of data on quantities extracted from the oil-water. - Oil economy, 1974, No. 4, S. 34-38.

4. Pat. U.S. No. 3386506, CL 166-9, 08.04.1966 /04.06.1968.

5. Pat. U.S. No. 3599717, CL 166-273, (E 21 In 43/22), 03.12.1969 /17.08.1971.

6. Pat. U.S. No. 4417621, CL 166-249, (E 21 In 43/16), publ. 29.11.1983.

7. Pat. U.S. No. 3244228, CL 166-9, 27.12.1962 /05.04.1966.

8. Experimental results the displacement of oil from the polluted and flooded porous media /Ostrovsky, Y.M., Liskevich H., Onoprienko VP, Faniel RD //Trudy inst. Ukrniipit, vol. 11-12. - M., Nedra, 1973, S. 3-10.

9. Doroshuk NF, Harazi NI, Yunaev Russia, having got the Analysis of the application of the periodic injection of gas and water under high pressure at the experimental site Minnibaevskii space //Proc. TatNIPIneft, vol. 51. - Bugulma, 1982, S. 16-21.

10. As the USSR №1829208 “Hydrodynamic pressure oscillation generator”. Priority from 14.02.1989, Theregister. 13.10.1992,

1. The way of the development of hydrocarbon deposits, including the drilling of production and injection wells, the injection of gas and water through injection wells in a separate zone of the reservoir and production of hydrocarbons from wells, creating a split between a gas-, water - and uglevodonasyschennye areas with a predominant content of the gas respectively, cumulative for later use is, water and hydrocarbons, periodic pumping of accumulated gas from the generated gas-saturated zones in the saturated zone, characterized in that produce periodic water injection into gas-saturated zones.

2. The method according to p. 1, characterized in that the accumulated gas is injected into the saturated zone in the form of a gas mixture.

3. The method according to claim 1 or 2, characterized in that upload associated gas in this field.

4. The method according to claim 1 or 2, characterized in that the injected hydrocarbon or non-hydrocarbonaceous gas from other sources.

5. The method according to any one of claims 1 to 4, characterized in that the pumped water with the addition of specially selected chemicals or their compositions.

6. The method according to any one of claims 1 to 5, characterized in that upon reaching the gas content in water-saturated zones in the range from 0.1 to 28% of the water content in the saturated zones generate elastic waves with a frequency in the range from 0.001 to 45 kHz and an amplitude in the range of 0.02 to 2.8 MPa.

7. The method according to any one of claims 1 to 6, characterized in that the gas and water into a separate zone of the reservoir with the simultaneous generation therein of elastic waves with a frequency in the range from 0.001 to 45 kHz and an amplitude in the range of 0.02 to 2.8 MPa.



 

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