Method development gascondensate-oil field

 

(57) Abstract:

The invention relates to the development of hydrocarbon fields, and in particular to methods of developing hydrocarbon resources, complicated by the presence of zones of different permeability rocks, and may find application in the development of gas condensate and gascondensate-oil fields. Enhances the production rate of wells and extraction of hydrocarbons from reservoirs, as well as reduced costs of drilling and equipping of fishing. The inventive reveal productive cut wells with a Central vertical bore and a peripheral inclined wells. They have sites that are located within a continuous seam along its stretch. Well perforined. Productive incision open wells at regular geometric grid and from a single drilling platform. Peripheral inclined wells are at a given Zenith angle. This provides hit bottom wells at the project depth in the heel solid productive formation in the corners of a regular hexagon. In three wells located within 120oby stretch solid layer in the direction of its the comfort of their filters. The perforation of wells produce phased in two stages. In the first stage perforined intervals in all wells in the zone of discontinuous layers. In the second stage perforined solid layer in vertical wells and horizontal wells, having slightly sloping and inclined sections. 5 Il.

The invention relates to the development of hydrocarbon fields, and in particular to methods of developing hydrocarbon resources, complicated by the presence of zones of different permeability rocks, and may find application in the development of gas condensate and gascondensate-oil fields.

A known method of cluster drilling of wells used in the extraction of hydrocarbons [1]. Its essence lies in the fact that from a single drilling platform hosts several high-angle well defined Zenith angles. Method of cluster drilling, despite some technological complications, it is highly effective since it can significantly reduce the time spent on dismantling, transportation and installation of drilling equipment and thus reduce the cost of drilling operations.

There is a method of increasing the surface for drilling and expansion of the drainage area in the elaboration of the I et some technological difficulties horizontal drilling, the method makes it possible to increase the flow rate and the recovery rate of hydrocarbons from the reservoir, without increasing the volume of drilling operations, which reduces the value of extracted hydrocarbons.

It is known that to increase the output of useful components, in particular of gascondensate-oil fields, due to the specifics of their geological structure is essential for the procedure of opening of productive strata and the well is put into operation [3]. The problem is that at the initial stage of field development to achieve maximum release of hydrocarbons from choppy layers with low permeability. This explains the fact that the currently used methods of development of hydrocarbon deposits, as a rule, differ in the order of perforation areas of the productive series and the well is put into operation.

It is well known that hydrocarbon deposits may differ greatly from each other in composition and properties of hydrocarbons, geological structure, conditions of productive formations, their permeability, etc., For this reason, up to this time there is no universal methods for the placement of tion, square, rectangular or other grid and used for this purpose, 5-, 7-, 9-point cells [4]. Naturally, in each case one chooses a geometric grid or cell for well placement, which taking into consideration the above factors results in a maximum yield of hydrocarbons with minimal financial and labor costs for development of the field.

There is a method of developing a petroleum reservoir [5]. The essence of it consists in the following. Are drilling vertical wells, putting them in a geometric grid, representing two correct deployed relative to each other on the 30ohexagon with producing wells on the sides, in corners and in the center of the hexagons. Pass additional wells, intermittent opening part of the reservoir, and have them within an internal hexagon, symmetrically external. Analyzing the layers produced in two stages: in the first reveal intermittent part of the section in the wells located on the outer hexagon and producing additional wells, the second - in wells on the outer hexagon reveal the entire productive section.

Main disadvantages: the mi considerable time for installation and dismantling and transportation of drilling rigs. This increases the capital investment to develop the field.

There is also known a method of developing a petroleum reservoir [6]. According to this method the oil reservoir razvarivat 5-point cells. The cell contains producing vertical well, located in the corners of the square. This wells are horizontal sections in the reservoir. In the centre of the square are drilling vertical injection well.

The disadvantage of this method is that the probability of getting injection wells in the zone of reduced permeability of the reservoir, which reduces the flow rate and oil recovery.

The closest technical solution of the same purposes that the present invention is a method of developing oil deposits in p. RF N 2112868 [7]. The essence of the method consists in the following. Oil and gas reservoir razvarivat mining and downhole pumping systems, consisting of one vertical and at least two psevdogorizonty trunks. Well systems have along strike of the Deposit. While vertical wells reveal condensate cap and psevdogorizontom - oil rim.

The main disadvantages of the Jay, folded continuous layers),

- a significant amount of drilling operations due to the large number of injection wells.

Task - using a simple grid opening Deposit a limited number of wells, to provide for the development gascondensate-oil field high value of flow rate and extraction of hydrocarbons from reservoirs, as well as reduced costs of drilling and equipping of Providence.

The problem is solved as follows. From a single drilling platform drilled the well cluster, consisting of one Central vertical and six peripheral inclined wells. All wells are producing. The angle of inclination of the peripheral wells to the horizon is set high enough to ensure getting their face on the project depth in the sole continuous seam in the corners of a regular hexagon. In three inclined wells, angled 120orelative to each other, in a continuous layer from its roof and to the sole along the strike of the formation in the direction of greatest saturation hydrocarbons drilled slightly sloping and inclined sections, which, after sinking equipped with filters. Opening productservice layers, on the second vertical wells and in wells that do not have slightly sloping and inclined sections, perforated interval, set in a solid layer.

Further, the invention is illustrated by drawings, which depict:

- Fig. 1 is an isometric image of Bush wells on a hexagonal Central bore;

- Fig. 2 is a horizontal projection of the hive wells on a hexagonal Central hole

- Fig. 3 is a diagram of the intersection of a solid and a dashed productive layers of vertical and inclined wells and an inclined bore with slightly sloping and inclined section;

- Fig. 4 - development of the North - Vasyugan gas condensate field, composed of JSC "Tosches";

- Fig. 5 - development of the North - Vasyugan gas condensate field, is composed of "TyumenNIIgiprogaz".

Implementation of the proposed method is demonstrated on the example of the development of part nylginskogo gascondensate-oil fields in the Tomsk region. From a single drilling platform 1 is being drilled the well cluster, consisting of one Central vertical 2 and six peripheral inclined 3 wells (Fig.1, 2). All wells are producing. Senitive solid layer at a depth of 2200 - 2400 m in the corners of a regular hexagon at a distance of about 1000 m from the bottom of the vertical well, located in the centre of the hexagon. Thus, the solid layer is exposed vertical well bore at an angle of 90oand three inclined boreholes through the 120ounder the given angle 66 - 68oto the horizon. The other three inclined wells, also located in 120ocross a solid layer on its stretch slightly sloping and inclined sections 4 (Fig. 3). The angle of these wellbores is selected based on the capacity of the solid layer so that their trajectory took place within the solid layer from its top and to the bottom at a distance of 250 - 500 m from the corner of the hexagon. While these areas are directed toward the greatest saturation of the reservoir hydrocarbons. In the process of growing these wells areas 4 are equipped with filters.

Well perforation is made in two stages: the first stage in all wells of any punching plots located in discontinuous layers 5, in the second stage - with decreasing reservoir pressure - any punching the vertical sections and three inclined wells, not having inclined sections in a continuous layer 6 (Fig. 3).

In the private field, based also put the proposed method (Fig. 4). On the field, it is planned to drill 3 well cluster with a total of 21 well. Capital expenditures for drilling is 40 million. USA with a total capital cost - $ 75 million. USA. This project has undoubted advantages over the project developed Tyumen Niigiprogaz, which is based on the use of 3 - and 5-point cells with square and rectangular grid arrangement of vertical wells (Fig. 5). Project "TyumenNIIgiprogaz" provides for the drilling of 10 cells with a total of 44 wells. Capital expenditures for drilling $ 80 million. USA with a total capital investment of 235 million. USA.

From here you can see the technical, technological and economic advantages of the proposed method of development of gas condensate and gascondensate-oil fields.

Thus, the proposed method allows you to:

to increase the flow rate and the recovery rate of hydrocarbons from reservoirs;

- to reduce the number of production wells;

- reduce the time for installation and dismantling and transportation of the rig;

- what Yon craft.

Sources of information

1. Reference drilling engineer. I. 2./ Ed. by C. I. of Micevych and N. A. Sidorova.- M.: Nedra, 1973.

2. A. M. Grigoryan. Analyzing the layers of multilateral and horizontal wells.- M.: Nedra, 1969.

3. Y. C. Zheltov and other Development and exploitation of oil and gas condensate fields.- M.: Nedra, 1979.

4. C. D. Lysenko. The development of oil fields. Theory and practice.- M.: Nedra, 1996.

5. RF patent N 2012792, E 21 In 43/30, 43/20. The way of the development of oil deposits. B. I. N 9,1994,

6. U.S. patent N 4727937, NCI 166 - 245. The method of developing a petroleum reservoir, 1986

7. RF patent N 2112868, E 21 In 43/16, 43/00. The way to develop oil and gas deposits. B. I. N 16, 1998

Method development gascondensate oil fields, including drilling cut wells with a Central vertical bore and a peripheral inclined wells, with sites located within a continuous seam along its stretch, and perforation of wells, characterized in that the productive incision open wells at regular geometric grid and from the drilling platform, and a peripheral inclined wells are given anti-aircraft Plumville hexagon, in three wells located within 120oby stretch solid layer in the direction of its greatest saturation hydrocarbons Buryats slightly sloping and inclined sections from the roof to the bottom of the reservoir and equip them with filters and perforated wells produce phased in two stages: the first stage perforined intervals in all wells in the zone of discontinuous layers, the second stage is a solid layer in a vertical well and horizontal wells, having slightly sloping and inclined sections.

 

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