The way of the development of oil deposits

 

(57) Abstract:

The invention relates to the oil industry and can find application in the development of oil deposits. Provides enhanced oil recovery reservoir. The inventive method includes the selection of oil through the ranks of production wells and the injection of working agent through a series of injection wells. According to the invention producing wells in the ranks of perform in the plan in accordance with the displacement front each injection well, located in front of the production well, when the beginning of one of the production well is the same or as close as possible to the end adjacent the production well and has a length that allows you to block the displacement front. The alignments themselves producing wells have to cut from the bottom of the first row to the top of the last row from a number of injection wells. The first series of production wells placed in the lower part of the deposits on the distance from the bottom of the productive layer is not more than 25% of the height of the productive formation. The second row of production wells placed in the middle part of the reservoir at a distance from the bottom of the productive formation 25-75% of the height of the productive formation. The third row of production wells are arranged in the x2">

The invention relates to the oil industry and can find application in the development of oil deposits.

There is a method of developing oil deposits, which are placed on reservoir production and injection wells on block-closed system. Select the oil through production wells and pumps working agent through the injection wells. Translate producing wells diagonal row in injection through one. Download the working agent density of 1.06-1,09 g/cm3through the Central injection well, and then in the other injection wells. Gradually, as the water is transferred to the discharge of all wells diagonal row. Equalize the pressure along the diagonal row of injection wells. In the Central zone injection wells to increase pressure for 15 -25% compared to the average reservoir pressure in the diagonal row of injection wells. Injection wells operation is carried out in a cyclic mode: upload a working agent in diagonal rows of injection wells for reducing the volume of injection of the working agent in the primary rows of injection wells on the volume injected into diagonal rows naked working agent in full in injection wells to the main series in 10-20 days. Obwodnica producing wells in the area of the diagonal rows of injection wells operate in a cyclic mode: trigger them when you stop injection wells diagonal row and stop at the downloading of the working agent through the injection wells diagonal row. (Patent RF № 2060369, CL E 21 In 43/20, published. 1996.05.20).

The known method does not allow to develop the Deposit with the achievement of high oil recovery.

Closest to the invention to the technical essence is the way of the development of oil deposits, in which the drilling of wells and place them in rows, select the oil through production wells and pumps working agent through the injection wells in the mode of reduction of reservoir pressure before reaching its values 80-85% of the original. Determine the line current is injected working agent that is perpendicular to the rows of injection wells. Irrigated production wells located on these lines, the current is transferred to the discharge. Continue to develop deposits in the mode of maintaining reservoir pressure. Allocate zone deposits with low values of porosity, permeability, saturation, depletion of stocks and skorostoi zone and/or for this area on the opposite side from the nearest number of injection wells. Perforined additional producing wells in the roof part of the productive formation. The oil extraction is carried out with the depression of not lower than 85% of the initial reservoir pressure. As a working agent use water density of 1.08-1.10 g/cm3for example associated Devonian produced water. Download working agent is carried out in a cyclic mode: 10-20 days injection, 10-20 day stop at the same time provide the matching volume selection and injection of fluids for three months of development (Patent RF № 2065938, CL E 21 In 43/20, published. 1996.08.27 - prototype).

There is a method allows to extract from the deposits of oil reserves, but oil recovery reservoir remains at a low level.

In the proposed method solves the problem of increasing oil deposits. The task is solved in that in the method of development of oil deposits, including oil extraction through a series of production wells and the injection of working agent through a series of injection wells, according to the invention, the producing wells in the ranks of perform oval shape in the plan in accordance with the displacement front and a length that allows you to block the displacement front, have rows of production wells on the incision from the bottom of the first row in the row of injection wells in the lower part of the reservoir, the second row of wells in the middle part of the reservoir, the third row of production wells in the upper part of the deposits.

Features of the invention are:

1) selection of oil through a series of extraction wells;

2) download a working agent through a series of injection wells;

3) performance of producing wells in rows of oval shape in plan;

4) the same in accordance with the displacement front;

5) the same length, allowing you to block the displacement front;

6) the location of rows in the section from the bottom of the first row to the top of the last row from a number of injection wells;

7) the location of this first series of production wells from a number of injection wells in the lower part of the reservoir, the second number of producing wells in the middle part of the reservoir, the third row of production wells in the upper part of the deposits.

Signs 1, 2 are shared with the prototype, signs 3-7 are the salient features of the invention.

The invention

In the development of oil deposits are a significant part of the oil remains in the reservoir. In the proposed method solves the problem of increasing oil deposits. Task resety production wells and the injection of working agent through a series of injection wells. For the largest selection of oil from deposits of producing wells in the ranks of perform oval shape in the plan in accordance with the displacement front and a length that allows you to block the displacement front. This ensures that the overlap of the displacement front in the plan. Thus, when the distance between the wells of 500 m length, allowing you to block the displacement front, is also equal to 500 m Have rows of production wells on the incision from the bottom of the first row to the top of the last row from a number of injection wells. When this feature first row of production wells from a number of injection wells in the lower part of the reservoir, the second row of wells in the middle part of the reservoir, the third row of production wells in the upper part of the deposits. As a rule, the lower part of the deposits watered with in the first place. Therefore, the first number of producing wells from a number of injection wells placed in the lower part on the distance from the bottom of the productive layer is preferably not more than 25% of the height of the productive formation. After the flooding of the first row are selected oil through the second row of production wells located farther from the displacement front. The second row of production wells have a higher first number on the distance from the bottom of produktsii impact and to increase the recovery rate. This also contributes to the location of the third row of production wells in the upper part of the deposits and on the maximum distance from a number of injection wells. The third row of production wells have a higher second number on the distance from the bottom of the productive layer preferably 75% of the height of the productive formation and more.

A specific example of the way

Develop oil reservoir Romashkinskoye field with the following characteristics: porosity - 11.9%, permeability - 0,029 μm2the saturation - 61,1%, absolute mark oil-water contact - 870 m, the average saturated thickness of 8 m, the initial reservoir pressure of 11 MPa, reservoir temperature is 25°C, the parameters of the reservoir oil: density of 930 kg/m3the viscosity of 46 MPa-s, the saturation pressure of 1.8 MPa, gas content - 15.2 m3/t sulphur content is of 3.64%.

Download the working agent is highly mineralized water density 1180-1200 kg/m3with lower horizon through a series of injection wells 10 wells in each row. Select the oil through a series of extraction wells 10 wells in each row. This six rows of production wells are located between two rows of injection Kunene from each injection well, located across from mining. The beginning of one of the production well is the same or as close as possible to the end adjacent the production well. Thus, the length of the wells allows to block the displacement front. The rows of wells have to cut from the bottom of the first row to the top of the last row from a number of injection wells. When this feature first row of production wells from a number of injection wells in the lower part of the reservoir at a distance of 2 m from the bottom of the reservoir, the second row of wells in the middle part of the reservoir at a distance of 4 m from the bottom of the reservoir, the third row of production wells in the upper area of the reservoir at a distance of 6 m from the bottom of the reservoir.

In the development of the oil recovery increased by 4% and amounted to 42%. The application of the proposed method will improve the recovery of oil deposits.

The way of the development of oil deposits, including oil extraction through a series of production wells and the injection of working agent through a series of injection wells, wherein the producing wells in the ranks of perform in the plan in accordance with the displacement front each injection well, located opposite Aetna the production well and has a length, allows you to override the displacement front, and the rows of wells have to cut from the bottom of the first row to the top of the last row from a number of injection wells, the first series of production wells placed in the lower part of the deposits on the distance from the bottom of the productive layer is not more than 25% of the height of the reservoir, the second row of production wells - the middle part of the reservoir at a distance from the bottom of the productive formation 25-75% of the height of the reservoir, and the third the number of producing wells in the upper part of the deposits on the distance from the bottom of the productive formation 75% or more of the height of the reservoir.

 

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