Method for oil reservoir development in carbonate or terrigenous formation with developed macrocracks

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

 

The invention relates to the field of oil and gas industry, namely to improve the efficiency of the development of oil deposits in carbonate or terrigenous reservoir developed microresonator.

There is a method of developing oil carbonate reservoirs, including the drilling of production and injection wells and holding them in hydrochloric acid treatment (RMS) with the aim of increasing the productive characteristics of the wells (see Amelin I.D. and other Exploitation and development of oil and gas fields. Ed. Nedra, 1978, s-274).

The disadvantages of this method are as follows.

As a rule, all productive oil-bearing strata are heterogeneous reservoir properties. Carbonate reservoir in addition usually are fracturing. Therefore, the holding RMS, on the one hand, leads to the growth of the productive characteristics of the well. On the other hand, enhances the natural heterogeneity of the reservoir by reservoir properties. This is due to the fact that injected into the formation, the acid penetrates into the most permeable interlayer and/or crack. In the reaction of the acid with rock, increases the permeability of the respective interlayer and/or cracks. The consequence of this is the increasing heterogeneity of the reservoir by reservoir properties.

- Similar si is n occurs from the injection well at holding it SKO. The result : better connectivity between the faces of the extraction and injection wells. This means that injected into the formation water will not perform useful work on the displacement of oil to the bottom of the production well. Because water is mainly to circulate through stimulated the formation and/or fracture.

Operations SKO costly, require significant amounts of a variety of techniques. Transportation and one only of this technique in the period of the RMS has an unwanted burden on the environment.

Closest to the proposed method is hydraulic fracturing of carbonate or terrigenous fracturing, including the drilling of vertical and/or horizontal production and injection wells and holding them in fracturing treatments. The creation of cracks fracturing increases the filtration surface of the well. This increases the flow rate of the extraction and injection capacity of the well (see Amelin I.D. and other Exploitation and development of oil and gas fields. Ed. Nedra, 1978, s-281).

The inherent limitations of the method under consideration are as follows.

- The direction of artificially created cracks in the extraction and injection wells is virtually impossible to regulate. Therefore, positive passedst the I in the form of the growth rate of mining and injection wells may offset the negative effects from unwanted directions of fractures. In the limit, for example, they can almost connect. Then the efficiency of waterflooding may decline sharply, which will lead to the reduction of the oil recovery factor (CIN), and hence recoverable oil reserves.

- Fracturing treatments are also expensive. Require numerous and diverse techniques, reagents. Transport and the work of all involved in hydraulic fracturing techniques likewise harms the environment.

The present invention is the task of creating technologies for the development of oil deposits in carbonate or terrigenous reservoir developed microresonator, which provides the growth rate of the production well and the injection well, as well as increased enrolment ratio displacement of oil by water and KIN with concomitant elimination of the above-noted disadvantages.

The task is achieved in that in the method of developing oil deposits in carbonate or terrigenous reservoir developed microresonator based drilling production and injection wells and flooding of productive stratum produce 3D seismic work to identify volumetric tracing system of natural microtrain form of them "upstream" and "injection" macro-cracking, drilling of wells in the corresponding types of microtrain and form a system "mining and milling is well - Macromedia" for the oil extraction and injection well - Macromedia for flooding, and also that:

- form system "producing well - Macromedia to extract oil and produced water injection through vertical and/or horizontal, multilateral wells placed between these production systems, as well as between the outer oil-water contact and production systems;

- form system "injection well - Macromedia to flooding, and removing the oil passes through vertical and/or horizontal, multilateral production wells placed between the marked injection systems;

- form a combined system "producing well - Macromedia", "injection well - Macromedia", vertical and/or horizontal, multilateral production and injection wells are placed relative to each other based on the principle of achieving the highest coverage rate of displacement of oil by water;

- noted approaches are implemented in the case of development of gas condensate deposits on the basis of the Cycling process.

The method is as follows.

On field conduct 3D seismic work. In the interpretation of 3D seismic data reveal the system microtrain, l is ceralloy and deep trace.

According to the results of 3D seismic, field geophysical and hydrodynamic research, and data from core analyses, create 3D geological and then 3D geological-hydrodynamic model of the concerned oil. When this exercise local crushing of a grid region in the vicinity of the surface of each macro-cracking. Adjust 3D geological and hydrodynamic models of the reservoir to the data in hydrodynamic research and data in their pilot and industrial use.

Using established and adaptirovannoi 3D geological and hydrodynamic models and the corresponding software system solutions 3D multiphase problems of theory of filtration perform multiple computer experiments. The aim of these experiments is to maximize the coverage factor, and thus KIN, consequently, the value of recoverable oil reserves. This goal is achieved on the basis of justification

- those microtrain who will perform the role of mining in the system "producing well - Macromedia";

- those microtrain, which plays the role of pressure in the system "injection well - Macromedia";

- the number, location, vertical, horizontal, multilateral production and injection wells.

Select the best design, as always is, is based on the subsequent feasibility study. After this is accomplished through implementation of the best design option development.

This means that in the corresponding microtrain subuniverse production well for the purpose of creating a unified system "producing well - Macromedia". The success of this operation is facilitated by the presence of a zone of disintegration around macro-cracking. For greater reliability implement a weak sinusoidal profile of the barrel, allowing with confidence several times to cross the plane of the macro-cracking and the zone of disintegration. Modern technology of well drilling permit it to do without any problems.

Similarly a system of "injection well - Macromedia". Also drilled well other types and the corresponding destination. The result is the creation of a planned development system.

It is easy to see that the proposed development method has the following advantages.

- Eliminates the costs of hydraulic fracturing and SKO.

Natural macro-cracking, due to the significance of the filtration surface, capable of flow rates of oil and the costs of the injected water fold greater than in traditional approaches.

- As a result, significantly reduced the required number is about wells on the development of oil deposits, reduced costs for drilling, significantly increases the efficiency of development resources of oil.

- The use of natural microtrain makes it possible to increase the recoverable reserves of oil, because that is a point well-impacts cannot move to large-scale impact on the filtration processes in the reservoir.

An example implementation.

Passed almost all stages of the Project development of the Prirazlomnoye oil field in the Pechora sea shelf. The development of this field carbonate reservoirs provides for the drilling of horizontal production and injection wells, and conducting operations SKO.

This means that RMS will increase the natural heterogeneity of the reservoir properties of productive reservoir. Hence the negative consequences from the point of view of premature irrigation wells, reduction of recoverable oil reserves, etc. Designed as well will carry out spot stimulation, which is usually characterized by the reduction of CIN and recoverable oil reserves, etc.

On the basis of 3D seismic surveys in the field identified a significant number of microtrain. The corresponding map on the drawing shows their spatial location. While some macro-cracking have protaganist is 5-6 km For comparison, we note that the size of the cracks with hydraulic fracturing is not more than 200-300 meters.

Presents data on Prirazlomnoye oil field indicate the need to implement here is to develop principles for the development of oil carbonate reservoirs and converting microtrain of negative factors positive factors increase recoverable oil reserves and reduce the cost of field development. Because it is possible to reduce the required number of wells to develop the field, to increase recoverable oil reserves, as well as to achieve or exceed planned levels of oil production.

Thus, it seems that the proposed approach to the development of oil deposits in carbonate or terrigenous reservoir developed microresonator will improve the efficiency of the development review and other relevant domestic oil fields and increase recoverable oil reserves. A similar conclusion is valid relative to the gas-condensate fields, developed with the implementation of the Cycling process.

The way to develop oil deposits in carbonate or terrigenous reservoir developed microresonator, including the drilling of production and injection wells and the maintenance of reservoir pressure, characterized in that produce seismic work is to identify volumetric tracing system of natural microtrain with their lateral and depth trace, form of them "upstream" and "injection" macro-cracking, drilling of wells in the corresponding types of microtrain and form a system producing well - Macromedia" for the oil extraction and injection well - Macromedia to flooding or systems producing well - Macromedia for oil recovery and system of vertical and/or horizontal multilateral wells to flooding, or system injection well - Macromedia to flooding and systems vertical and/or horizontal multilateral wells for oil recovery, or system producing well - Macromedia", "injection well - Macromedia" and a system of vertical and/or horizontal multilateral production and injection wells.



 

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