RU2395674C1 - Method of oil pool development - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: method involves deposit development for producing and injection wells, reservoir exposing in the wells, hole bottom survey in a zone of local dome elevation according to a producing well grid, injection of a driving medium through the injection wells and withdrawal of oil through the producing wells. According to the invention, development of a deposit presented by a producing formation with alternating zones of local dome elevation and local depression shall enable gravity drive to the top of dome elevation due to water in local depression, and intensive oil recovery in the zone of dome elevation. That is ensured by transforming the injection wells in the zone of local dome elevation into the producing wells, and withdrawing oil through the producing wells located in the zone of a local dome elevation so that the lower hydrodynamic level in these wells is, the closer to the top of this dome elevation the producing well is.

EFFECT: more effective development of oil pool with dome-shaped elevations due to goal water displacement towards dome-shaped elevation.

3 cl, 2 dwg

Description

The invention relates to the oil industry, and in particular to methods for developing oil deposits, developed with maintaining reservoir pressure by pumping water into the reservoir through injection wells and confined to dome rises.

The well-known "Method for the development of an oil field" (patent RU No. 2254457, ЕВВ 43/20; 43/30 publ. Bull. No. 17 of 06/20/2005), including drilling injection and production wells, pumping a working agent through injection wells, oil production through producing wells, the allocation of areas of dome-shaped elevations that exceed the absolute elevations of the formation, the placement of additional wells in these areas, characterized in that they design wells at the tops of dome-shaped elevations even with a violation of the uniformity of the design grid of wells n, and after complete drilling of the grid of wells and in the event that the location of the vertices of the dome-shaped elevations is drilled from the nearest wells, the lateral trunks towards the specified vertices of the dome-shaped elevations that control the field are drilled, and in the nearest wells and sidetracks located at the tops of the dome-shaped elevations, open the interval of the reservoir between the absolute mark of the roof in this well and the absolute mark corresponding to the roof in the nearest well, while well, placement of wells on the tops of dome-shaped elevations even with a violation of the uniformity of the design grid of wells, and after complete drilling of the grid of wells and if the location of the vertices of dome-shaped elevations are drilled from the nearest wells according to the drilled wells, sidetracks towards the specified vertices of dome-shaped elevations that control the field, in the nearest wells and sidetracks located on the tops of dome-shaped elevations, when the absolute mark of the roof of the reservoir of the nearest wells below the producing formation soles in sidetracks, reveal the entire formation.

The disadvantage of this method is the premature flooding of production wells, since the development of an oil field is carried out without taking into account bottomhole pressures in production wells.

The closest in technical essence is the "Method for the development of oil deposits" (patent RU No. 2225941, ЕВВ 43/20, publ. Bull. No. 7 of 03/20/2004), including drilling the reservoir with producing and injection wells, perforating the reservoir in producing wells in two stages, water injection through injection wells and oil extraction through production wells, characterized in that, in accordance with the grid of the placement of production wells, determine the position of the bottom faces of production wells in the area of local domed sludge raising and in the zone of the local cavity, and at the first stage, when the bottom of the producing well falls into the zone of the local cavity, the production of the well is perforated in the interval of the bottom of the productive formation, and when the bottom of the production well falls into the zone of the local dome raising, the hole is perforated throughout the entire thickness of the productive formation, at the second stage, perforation of the roofing of the productive formation in producing wells located in the zone of the local cavity is performed, upon reaching and water content to 50% or higher, while in production wells located in the local area of the dome lifting produce insulation of the bottom portion of the producing formation.

The disadvantages of this method is the following:

- firstly, there is no deliberate displacement of oil by water in the direction of a dome-shaped rise;

- secondly, when developing an oil reservoir, a water cone is formed and water breaks into the producing wells, which leads to premature flooding of the well’s production. All this reduces the effectiveness of this method.

The objective of the invention is to increase the efficiency of oil production in deposits with domed uplifts due to the targeted displacement of oil by water in the direction of a domed uplift.

The problem is solved by the method of developing an oil reservoir, including drilling the reservoir with producing and injection wells, opening a reservoir in the wells, determining, according to the grid of the production wells, the position of the bottom faces of the wells in the local domed uplift zone, pumping the displacing agent through the injection wells and taking oil through the producing wells wells.

What is new is that when developing a reservoir represented by a productive formation with alternating zones of local dome uplift and local depression, they provide gravitational displacement of oil to the top of the dome uplift due to water in the local hollow and intensive oil recovery in the zone of domed uplift, for which injection wells in the zone of the local domed uplift is transferred to producing, and the selection of oil through the producing wells located in the area of the local domed uplift is carried out so that the dynamic level in these wells was the lower, the closer the producing well is located to the top of this dome uplift.

Also new is the fact that if it is impossible to reduce the hydrodynamic level to the required in production wells in the area of the local dome uplift, additional production wells are drilled within this dome uplift in violation of the uniformity of the grid.

Also new is the fact that if it is impossible to reduce the hydrodynamic level to that required in the production wells in the local domed uplift zone, the production wells in the local domed uplift zone are equipped with horizontally-inclined and / or horizontal bottom-hole sections located within the reservoir.

The figure 1 shows a diagram of the implementation of the proposed method.

The figure 2 shows the grid development of oil deposits.

The proposed method is as follows.

In figures 1 and 2 depicts a reservoir of oil drilled on a specific grid producing 1 ¹ ; 1 ² ; 1 ³ ; 1 ⁴ and injection 2 ¹ ; 2 ² ; 2 ³ ; 2 ⁴ ; 2 ⁵ wells, which opened productive formation 3. Productive formation 3 is represented by the alternation of zones of local domed elevation 4 and local basin 5.

In accordance with the grid determine the location of production wells 1 ¹ ; 1 ² ; 1 ³ ; 1 ⁴ located in the zone of local domed uplift 4. These are production wells 1 ² ; 1 ³ . In addition, the injection well 2 ³ located in the zone of the local domed elevation 4, is transferred to the producing 1 ⁵ .

The development of an oil reservoir with dome rises is started, and a displacing agent (water) is injected through injection wells 2 ¹ ; 2 ² ; 2 ⁴ ; 2 ⁵ and oil extraction through production wells 1 ¹ ; 1 ² ; 1 ³ ; 1 ⁴ ; 1 ³ .

Oil withdrawal through production wells 1 ¹ ; 1 ² ; 1 ³ ; 1 ⁴ ; 1 ⁵ , located in the zone of local domed uplift 4, they are carried out so that the hydrodynamic levels in the wells are the lower, the closer the producing well is located to the top of this domed uplift 4, that is, in producing wells 1 ² ; 1 ³ ; 1 ⁵ hydrodynamic levels 6 ² ; 6 ³ ; 6 ⁵ should be lower than hydrodynamic levels 6 ¹ ; 6 ⁴ in producing wells 1 ¹ ; 1 ⁴ . This is ensured by the fact that in production wells 1 ² ; 1 ³ ; 1 ⁵ install pumps (of any known design) of greater productivity than pumps launched into production wells 1 ¹ ; 1 ⁴ .

Thanks to high capacity pumps installed in production wells 1 ² ; 1 ³ ; 1 ⁵ , the pumping of oil from these wells occurs more intensively, as a result of which lower hydrodynamic levels are maintained in these wells 6 ² ; 6 ³ ; 6 ⁵ than hydrodynamic levels 6 ¹ ; b ⁴ in producing wells 1 ¹ ; 1 ⁴ equipped with lower capacity pumps.

Thus, the process of developing an oil reservoir occurs as soon as the hydrodynamic levels are 6 ¹ ; 6 ² ; 6 ³ ; 6 ⁴ ; 6 ⁵ in the corresponding production wells 1 ¹ ; 1 ² ; 1 ³ ; 1 ⁴ ; 1 ⁵ begin to align, then in the zone of local domed elevation 4, additional production wells 1 ⁶ and 1 ^{7 are} drilled within this domed elevation with violation of the uniformity of the grid, while the displacing agent is continued to be injected through injection wells 2 ¹ ; 2 ² ; 2 ⁴ .

Thus, the development of oil deposits with dome rises.

If it is impossible to reduce the hydrodynamic level to the required in production wells 1 ² ; 1 ³ ; 1 ⁵ ; 1 ⁶ ; 1 ⁷ in the area of the local domed elevation 4 and using production wells 1 ⁶ and 1 ⁷ , then production wells, for example, production wells 1 ² ; 1 ³ ; 1 ⁵ , located in the zone of the local domed elevation 4, are equipped with horizontally-inclined and / or horizontal bottomhole sections 1 ² ₁ ; 1 ³ ₁ ; 1 ⁵ ₁ , located within the reservoir 3, and continue to develop oil deposits until the development of residual oil reserves in the deposits with domed uplifts.

In the proposed method by reducing the hydrodynamic levels in production wells 1 ² ₁ ; 1 ³¹ ; 1 ⁵ ₁ ; 1 ⁶ ; 1 ⁷ , located in the zone of the domed elevation 4, intensive oil recovery occurs, on the one hand, and on the other hand, water forms in the lower part of the domed elevation 4, that is, in the local depression 5, which intentionally displaces oil due to gravitational forces up to the top of the dome lift 4.

In the proposed method for developing an oil deposit, the efficiency of oil production in deposits with domed uplifts is increased due to the targeted displacement of oil by water towards the domed uplift.

Claims (3)

1. A method of developing an oil reservoir, including drilling a reservoir by producing and injection wells, opening a producing formation in the wells, determining, in accordance with the grid of the production of production wells, the positions of the bottom faces of the wells in the local domed uplift zone, pumping the displacing agent through the injection wells and taking oil through the producing wells , characterized in that when developing a deposit represented by a productive formation with alternating zones of local domed uplift and local basin, o provide gravitational displacement of oil to the top of the dome uplift, due to water in the local basin, and intensive oil recovery in the zone of domed uplift, for which injection wells in the zone of local domed uplift are transferred to production wells, and oil extraction through production wells located in the local domed zone uplifts, carried out so that the hydrodynamic level in these wells was the lower, the closer the producing well is located to the top of this domed rise. 2. The method of developing an oil reservoir according to claim 1, characterized in that if it is not possible to reduce the hydrodynamic level to that required in production wells in the area of the local dome uplift, additional production wells are drilled within this domed uplift in violation of the uniformity of the grid. 3. The method of developing an oil reservoir according to claim 1 or 2, characterized in that if it is not possible to reduce the hydrodynamic level to that required in production wells in the local domed uplift zone, the production wells in the local domed uplift zone are equipped with horizontally inclined and / or horizontal bottom-hole sections located within the reservoir.

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