RU2435944C1 - Procedure for utilisation of associated oil gas and produced water - Google Patents

Abstract

FIELD: gas and oil production. ^ SUBSTANCE: products of water producer are received with at least one pump-compressor and are pumped into pressure wells through manifold valve. According to the invention products are pumped into abandoned water producers through lift pipes and a head with two branches. Inside of them there are arranged a vertical channel and a grate of directing plates forming a flat tangential near-the wall flow of pumped fluid descending to cross section of the well borehole at 45. ^ EFFECT: increased oil yield of reservoir at simultaneous reduced material expenditures. ^ 3 dwg

Description

The invention relates to the oil industry, in particular, can be used in the development of oil deposits with the maintenance of reservoir pressure, as well as in field collection systems for produced products.

A known method of operating a waterlogged oil reservoir [1]. This method includes the operation of interacting wells in a batch mode of operation. Periodic operation includes two stages. At the first stage, oil and water are pumped out of some wells through a gas separator and pumped into other wells with the possibility of oil accumulation in these wells, and water is pumped into the reservoir. Water and oil are pumped into these wells until a predetermined pressure is reached at the mouth of these wells or filled with oil. At the second stage, oil is pumped from all wells to the oil and gas gathering system until all or part of the oil is pumped out from other wells.

The disadvantages of this method [1] include:

- application of the method is performed in batch mode;

- the presence of a separator in which the gas is separated from the liquid;

- after oil separation at the first stage, at the second stage, oil from the group of wells in which oil was accumulated is pumped through one collection system along with the production of highly watered wells.

Closest to the technical nature of the claimed method is a method of disposal of incidentally produced oil gas and produced water [2]. The method [2] consists in the fact that the utilization of associated oil gas and produced water contained in the production of waterlogged wells is carried out using a separator. In the separator, the production of waterlogged wells is divided into low-water oil with residual gas, water and gas. Then, the mixture of water and gas is sent to receive at least one compressor pump and the water-gas mixture is pumped into injection wells. Low-water oil with residual gas is pumped to the oil recovery manifold using a compressor pump.

The disadvantages of this method [2] include the presence of independent separation systems, the number of which corresponds to the number of well sites in the field. This significantly increases the material costs for the length of pipelines and separator tanks of such systems.

The aim of the invention is to reduce material costs for water production for the reservoir pressure maintenance system, for the collection and preparation of oil well products while increasing oil recovery.

Achieving this goal is based on the features of the oil and gas gathering system in Western Siberia, namely the cluster location of wellheads. For irrigated oil fields, the discharge of water directly on the bushes is an important technological technique, which reduces the cost of pumping liquid and preparing oil. At the same time, the problem of the most complete development of oil fields is solved. Production of wells having a high water cut of 80% or more, a high natural temperature of 30-40 ° C and a low content of mechanical impurities up to 20 mg / l, can be directly injected into the reservoir through inactive waterlogged wells to maintain reservoir pressure. This allows for efficient separation with a high degree of phase without additional heating of the product and with the already existing volume (inactive waterlogged wells) of the settling equipment.

The essence of the invention lies in the fact that the production of highly watered wells, the water cut of which is 80% or more, through flow lines of the gas distribution unit, bypassing the multi-way switch of the wells, enters the inlet of the compressor pump, the output of which is connected to the distribution comb. The distribution comb is connected by flow lines of the gas distribution unit to injection wells. Well products with high water cut are pumped through the elevator pipes through nozzles consisting of a head with a connecting thread and two branches, inside of which there is a vertical channel and a lattice of guide plates. The nozzle allows you to form a flat tangential wall wall downward flow of injected fluid. In the central part of the wellbore, the velocity of the tangential downward flow is zero. As a result, conditions are created for the formation of two counter-directed flows: a tangential downward near-wall flow of heavily-watered well products and an upward axial flow of oil and emulsion globules released from watered well products. This leads to continuous accumulation of oil and natural gas in the upper part of the wellbore. The selection of oil and natural gas is carried out from the annulus of the injection wells in a fountain way to the oil reservoir, and water is pumped into the reservoir.

Thus, the claimed method meets the criteria of the invention of "novelty." In the study of other technical solutions in this technical field, signs that distinguish the claimed invention from the prototype were not identified, and therefore they provide the claimed technical solution with the criterion of "significant differences".

The essence of the proposed method for the disposal of associated produced oil gas and produced water and its implementation are illustrated by the following drawings.

Figure 1 presents a schematic diagram of a device for a cluster system for collecting water-well wells and pumping them into injection wells.

Figure 2 shows the device nozzle for forming a tangential parietal downward flow of injected fluid.

Figure 3 shows the development of the tangential near-wall flow of injected fluid.

The device of the cluster system (Fig. 1) includes a bush of oil production wells 1, part of which is connected directly to the gas distribution unit, and the other part of production wells with high water cut is connected by flow lines of the gas distribution unit to the input of the compressor pump 2. The output of the compressor pump 2 is connected to the distribution comb 3, which is connected by gas flow lines to injection wells 4. Oil and gas are taken from the annular space of injection wells into the oil collecting reservoir 5, and water is pumped into the reservoir.

The nozzles for the formation of a tangential near-wall downward flow of the injected fluid (Fig. 2) is a head 1 with a connecting thread, necessary for connecting it to the column of elevator pipes, and two branches 2. Inside the branches 2, a vertical channel 3 is located, providing uniform distribution of the flow along the branches , and the lattice of the guide plates 4. The profile of the guide plates 4 forms a flat tangential wall wall descending at an angle of 45 ° to the cross section of the wellbore. second fluid.

The development of the tangential near-wall downward flow of the injected fluid (Fig. 3) is associated with the interaction of the outflowing fluid with the fluid filling the cylindrical space of the wellbore 1. The interaction of the jet with the wall strongly influences the swirling jets developing inside the cylindrical channel 1. Therefore, a sharp change in the flow velocity occurs in the near-wall part of the jet. As a result, a tangential downward flow is formed with a maximum velocity near the wall of the cylindrical channel (velocity plot 2). In the central part of the cylindrical channel, the velocity of the tangential downward flow is zero. The oil globules and emulsions 3 contained in the production of highly watered wells are displaced by a heavier dispersed medium (water) into the flow region at lower speeds, i.e. to the axial region of the wellbore. As a result, conditions are created for the formation of two counter-directed flows: a tangential and a descending near-wall flow of injected fluid and an upward flow of oil and emulsion globules displaced from the production of watered wells. This leads to the continuous accumulation of oil and natural gas in the upper part of the wellbore, which allows for their continuous selection in a fountain way.

Using the proposed method for utilization of associated gas and produced water provides the following advantages compared to existing methods:

1) the exclusion of material costs for water production for reservoir pressure maintenance systems due to the existing infrastructure of the cluster equipment system;

2) reduction of material costs for the arrangement of cluster sites with independent separation systems;

3) protection of the environment from pollution due to a closed cycle carried out directly on the well sites according to the scheme “production watered well - injection well - formation-production well”.

Information sources

1. Patent RU No. 2117140. Published on August 10, 1992. A method of operating a waterlogged oil reservoir. / Tsigelnitsky I.G., Smirnov V.I.

2. Patent RU No. 2317408. Published 02/20/2008. A method for utilization of associated gas and produced water and a system for its implementation. / Klyushin I.Ya., Koshkin K.I., Chaika S.E., Khasanov E.M., Gorbunov SI., Konovalov V.V., Migunova S.V., Sitenko V.T., Shkurov O. AT.

Claims (1)

The method of utilization of associated gas and produced water, which consists in the fact that the production of waterlogged wells is sent to receive at least one compressor pump and pumped through a distribution comb into injection wells, characterized in that the injection is carried out into inactive waterlogged wells by elevator pipes through nozzles having two branches, inside of which there is a vertical channel and a lattice of guide plates, which form a flat tangential wall wall dyaschy angle of 45 ° to the cross section of the wellbore flow of injected fluid.

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