Method for underground gas storage creation in depleted oil-and-gas deposit

FIELD: methods or devices for use in mines or tunnels, not covered elsewhere, particularly modification of mine passages or chambers for storage purposes, especially for liquids or gases.

SUBSTANCE: method involves drilling wells in deposit and developing thereof by partial separated produced gas return. Gas extracted from deposit with high light-weight methane fraction content is returned through production wells into roof area of deep sited deposit at final deposit development stage under pressure less that saturation pressure to form gas cap. Underground natural gas storage is created in the gas cap.

EFFECT: decreased costs for storage creation, decreased storage creation time, increased coefficient of final hydrocarbon recovery in oil field developed by natural pressure depletion without tank gas and other valuable hydrocarbons output volume with the use of common production equipment.

2 cl

 

The invention relates to the oil and gas industry and can be used in the creation and operation of underground natural gas storage in depleted oil and gas fields.

There is a method of creation and operation of underground gas storage in the multilayered inhomogeneous weakly cemented tight terrigenous reservoirs with underlying water horizon, including the drilling of injection wells, equipment and their operational columns, injection into the reservoir of gas and its extraction. Injection wells are drilling with horizontal end of the barrel and have them bushes with a vertical well. First open vertical well producing formation and partially underlying the water horizon. Determine the local characteristics of the reservoir. The data and specify the profile and design of injection-production wells with horizontal end of the barrel. Then Buryats 3-8 injection-production wells with horizontal end of the barrel. The horizontal end of the feature along the radii from the center of the Bush and grow filters. The entry point of each horizontal end of the shaft in the roof of the productive formation is placed at a distance of not less than 100 m from the trunk vertical wells, It is used as an injection (patent RF №2136566, publ. 10.09.1999.).

The disadvantage of this method is the necessity of drilling, in addition to operational, injection wells, which greatly complicates and increases the cost of the process of creating underground gas storage.

There is also known a method of operation of underground gas storages in the multilayered heterogeneous reservoirs, which reveal the wells equipped with casing and the Central columns of the pipes. The annular space between the layers overlap the packer. Determine the permeability of each of the reservoir and pumped the gas in each layer through the Central column and annulus separately. First inject gas into the reservoir with lower permeability and control the performance of the injection. Upon achievement of performance equal to the initial performance more permeable reservoir, the pumping of gas produced in both layers. This increases the saturation of the deposition of objects, thereby increasing the volume of stored gas at 10-12% (ed. the certificate of the USSR No. 1512874, publ. in BI No. 37, 07.10.89).

The disadvantage of this method is the complexity and high cost of the process due to the necessity of opening a heterogeneous, multi-layer collector wells equipped casing and the Central columns of the pipe.

Also known SPO is about the development of gas condensate and oil fields, when the oil is withdrawn from the oil column through flowing wells, and gas from gas cap with simultaneous extraction of condensate. The pressure in the reservoir at the beginning of the development is equal to the saturation pressure. With decreasing reservoir pressure in the pore space of the reservoir will accumulate condensate, partially or completely lost during the extraction of gas. To maintain reservoir pressure using the injection of working agent - dry (separated) gas. Field razvarivat development wells through which the selected raw gas, and discharge, through which are the injection of dry gas (Ayissi. Development and exploitation of gas and gas condensate fields. M.: Nedra, 1979 s.204-205, 226-227 of).

However, all facilities for the operation of the gas condensate field with pressure maintenance are expensive, require maintenance of high pressure (the maximum pressure condensation) and structurally complex.

For the prototype of the present invention is adopted a method of creating underground storage in depleted multilayer fields, including drilling, cyclic gas injection into the reservoir deposits increased rate while increasing the active volume with a gradual increase reservoir pressure to the set value of the maximum on the effect, and evaluation of the tightness of the store on a technical condition of wells. Assessment of the integrity of the produce store before gas injection into the reservoir by pumping gas into the overlying thin layer before reaching the maximum pressure, and the injection of gas in the reservoir is produced during one season to the maximum pressure achieved in thin layer (patent RF №1475097, publ. 15.03.1994.).

The disadvantage of this method is the complexity and high cost processes to assess the tightness of the store on the technical condition of the wells and the need for a gradual increase reservoir pressure to the set value of the maximum pressure at the gas injection into the reservoir deposits increased pace.

The objective of the proposed method is to reduce the cost of building the underground storage of natural gas in the final stages of development of oil and gas deposits and saving deposits of commercial value for its subsequent further (getting oil and gas).

This object is achieved in that razvarivat oil and gas field exploitation (extraction) wells and are developing by the partial return of the separated produced gas, and according to the invention the return of the separated natural gas, OTB is selected from deposits (with high methane content of light fractions), produced through a production well in the arched part of the deep reservoir in the final stage of its development at pressures below the saturation pressure and form a gas cap, which create underground storage of natural gas.

After completing the oil and gas reserves (for the given parameters of uglevodosoderjati) Deposit, you can save at the stage of underground gas storage for several years. During this period there will be a natural recovery of the commercial value of oil and gas deposits for subsequent further and get both gas and oil from residual stocks of deposits.

According to the group of hydrocarbon oil composition of the Cretaceous sediments are of type paraffin-naphthenic with a predominance of paraffin hydrocarbons (temperature of crystallization of paraffin +52°).

The characteristic of the gas dissolved in oil:

- density (by air) at 0.730-0,840;

- gas composition (%% molar): methane 70-78; ethane 10-13; propane 4,25-6,72; butane 1,2-3,5; isobutane 1,0-1,4; heptane 0,2-1,2; hexane 0.6 to 1.4; carbon dioxide 2,5-2,9; nitrogen + rare 0,15-0,5.

The above characteristics of oil and dissolved gas are hydrocarbons upper and lower Cretaceous, occurring at the depths of 3500-5500 m

The method is as follows.

Deep oil and gas is haunted hydrocarbon deposits have to be much higher than the initial reservoir pressure above the saturation pressure of the petroleum gas (34,0 to 40.0 MPa), as an indicator of very high stock of elastic energy, providing a liquid-phase filtration of fluids. Thus, the natural modes of reservoir systems such objects can be attributed to a pronounced Progesteronum operating conditions.

How to develop deep deposits of hydrocarbons includes drilling deposits of vertical and/or horizontal production (operational) wells and selection of oil through them to reduce the reservoir pressure below the saturation pressure. The Deposit share reserves into two equal parts (top and bottom) and are developing through the implementation of three main operating conditions in each of the selected parts of the deposits (upper and lower):

- elastic-water mode with a flow rate of the stock of elastic energy reservoir systems and saturating fluids to the oil saturation pressure of the gas;

- mixed mode filtering fluids - oil, gas and water, with a gradual increase of coverage oil-saturated reservoir regime dissolved gas in the face of declining reservoir pressure at 50-90% below the saturation pressure and the invasion of water of the water basin;

- deep development mode of the dissolved gas from water intrusion water pool with three-phase filtration of fluids - gas, oil and water.

Design with vain must provide complete isolation of the wellbore casing from exposed seams pull all cut and full preventing filtration of fluids along the lining of wells (prevention the fluid flows along the cement stone).

In selected parts of the deposits (upper and lower) conduct individual development of the three main operating conditions. In the upper part of the reservoir implement the development of elastic mode of reservoir systems with reduced reservoir pressure to the saturation pressure phase filtering oil, then move to the development of a deep mode of the dissolved gas with two-phase filtration and oil released from the oil and natural gas (part of a major period of development of deposits) and at the final stage of development of deposits does not exclude the transition to a three-phase filter (+ water) as water intrusion water pool in the reservoir top reservoir. In the lower part of the deposits on the stage of the main period of development of deposits implement elastic-water mode of the hydrocarbon production from single-phase filtration of oil, with a gradual increase of two-phase filtration of oil and water as the invasion of water of the water basin, and then move to mixed mode drainage (until the end of development) elastic-water partial development mode of the dissolved gas in the volume of the lower part of the deposits with the formation of two - and three-phase filtration of fluids.

Under the proposed new regime of state drainage of hydrocarbons deep masses who ate deposits with the depletion of reservoir energy below saturation pressure strongly activated processes gravity segregation of oil and stand out from the oil and natural gas with the formation of a dynamic gas cap in the crest part developing object.

Thus, during the development of globalregional hydrocarbon deposits are prerequisites for the formation of underground natural storage of hydrocarbon gas at high energy conditions with the previously prepared technical base for their operation.

As described in the method of development of deposits is large uglevodorodakh (oil and gas, especially gas), part of the produced gas (50-80% of the gas factor, depending on the needs of consumption) after separation pumped back through the production well in the dome portion of the deposits that form the gas cap and create underground storage of natural gas. With long-term underground storage of gas in the oil and gas deposits continue to flow processes in-situ segregation of oil and gas, which will retain a residual gas reserves, thereby preserving the industrial value of deposits for subsequent further and get both gas and oil from residual stocks of deposits.

The present invention provides a significant reduction in the cost of building the store, reduction of the time of its creation, increasing the coefficient of ending uglevodosoderjati (in particular, hasoutdata) on undeveloped fields under development in the depletion mode, without reducing the volume of robotki marketable gas and other valuable hydrocarbons in the ordinary equipment of oil and gas wells (without injection wells).

1. The method of creating underground gas storage in depleted oil and gas fields by drilling their operational wells and partial reverse flow of the extracted separated gas, characterized in that the return of the separated natural gas taken from deposits with high methane content of light fractions produced in the arched part of the deep reservoir in the final stage of its development at pressures below the saturation pressure and form a gas cap, which create underground storage of natural gas.

2. The method according to claim 1, characterized in that the return of the separated natural gas in the dome part of the deposits produced through production wells.



 

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