RU71900U1 - INSTALLATION FOR REMOVING DROP OIL FROM ASSOCIATED GAS - Google Patents

Abstract

Installation for removing droplet oil from associated gas, including a well, a group metering ladder, drainage separators for the first stage of gas separation from oil, booster pumps, a collection tank, characterized in that the installation is additionally equipped with an apparatus installed after the drainage separators of the first stage in front of the torch on the gas supply line for its combustion and made in the form of a tank equipped with a filter-coalescing device that overlaps the working section of the apparatus, and composed of a composition of materials - porous cell istyh metal and (or) alloy and (or) a porous-polymeric cellular material with a fixed-cell porous structure, as well as storage tank for receiving the separated oil and installed after the unit and connected with PKU conduit from modular tank.

Description

The utility model relates to the field of technology for field collection, transport and preparation of oil and gas in oil fields, in particular, to the technique for separating emulsified hydrocarbon multiphase media, namely, to units for collecting and separating oil from associated gas supplied to a flare for combustion.

Field experience has shown that gas and water (formation) that are unavoidable during the production of oil satellites are released from oil when it rises from the wells to the surface with a decrease in pressure. The general essence of oil and gas preparation is reduced to the deep separation of a multicomponent emulsion: gas-oil-produced water, mechanical impurities. Almost everywhere and always, the objects of field production, transport and preparation of oil and gas are large-sized facilities with metal-intensive equipment, energy-intensive, financially expensive, with expensive equipment, with a long transport communications. In all design technological schemes presented by development engineers in special technical literature (KS Kasparyants “Oil and gas field preparation” Nedra Publishing House, M. 1973, p.118 - prototype), the most economically reflected appropriate options for specific development conditions taking into account the deepest possible separation of oil-gas-water flows with the achievement of standard quality indicators presented by oil-gas-refiners, providing for minimization of oil losses and its price gas components. However, in practice, in each case, factors appear that compel us to accept the inevitability of energy losses, including associated gas, sometimes in significant amounts. This is especially true for areas of the Far North with terrain features and remoteness of production areas from centralized oil and gas collection and treatment points. Nowhere in the design schemes is the fact of using flare farms (for burning excess gas after the separator drains of the first separation stage, left over from its use as energy and coolant for heating oil after the well), as objects of "production" necessity, also environmentally harmful , especially for the north is difficult to recover nature and wasteful in terms of financial management.

In figure 1. (based on the prototype) a standard schematic diagram of the technology of field collection and transportation of oil and gas of the Giprovostokneft Institute is presented. The separation of oil-gas flows is carried out in the process of two- or three-stage oil separation.

The heated oil from the well 1 through the metering ladder 2 enters the separator ladders of the first separation stage 3. The separator ladders have very large volumes and their number can reach up to 10 at each stage, depending on the volume of raw material preparation. The first stage of separation is carried out at a pressure of 7-8 atm., I.e. sufficient for uncompressed supply of the separated gas to the consumer or to gasoline plants (HBZ), if both are closely located and it is not difficult to transport. At large distances from the drains of the first separation stage 3 and adverse terrain conditions, further transport of oil with the remaining gases dissolved in it is carried out by booster pumps 4, through a collecting tank 5, and the second and third (if necessary) separation stages are carried out already at centralized points oil and gas treatment in the separator ladders of the II (6) and III (7) stages. The prepared oil stream goes to prefabricated tanks 8 and further to oil refineries, and the gas stream after 6 and 7 is transported to gas processing plants (gasoline (GBZ)). Thus, at production sites, consumers receive gas after the first stage of separation, mainly for their production needs, such as energy and coolant.

As practice shows, its amount, as a rule, is excessive, and the surplus is flared. The separation conditions in the separator ladders at the first stage are such that the oil is not completely separated from the gas and, in a droplet state, in significant quantities is also sent for flaring. The products of incomplete combustion of oil and moist gas pollute the soil around for considerable distances, and the heated (heated) atmosphere is polluted with harmful gas emissions.

Under such conditions of implementing the technology of harvesting, transporting and preparing oil and gas, the whole North of the country is located, and losses from losses of gas, oil and damage to nature characterize unjustified wastefulness.

The elimination of these disadvantages is achieved by the fact that the installation for removing droplet oil from associated gases, including a well, a group metering ladder, ladders, separators of the first stage of gas and oil separation, booster pumps, and a collection tank, is additionally equipped with an apparatus installed after the first stage ladders, in front of the torch on the gas supply line for its combustion and made in the form of a tank equipped with a filter-coalescing device (PKU) that overlaps the working section of the apparatus and is composed of positions material - a porous-cellular metal and (or) alloy and (or) a porous-polymeric cellular material with a fixed-cell porous structure, as well as storage tank for receiving the separated oil and installed after the unit and connected with PKU conduit from modular tank.

The device with PKU is a capacity, the size of which can be designed for any performance, as well as PKU.

The material for the destruction of the emulsified medium in PKU is a composition of porous-cellular metallic and polymeric materials with optimal surface properties for the working medium. High efficiency of gas and oil separation is achieved due to the highly developed working contact surface of the medium with a fixed porous-cellular structure of the materials used, having 93-95% of the free volume. The high performance of the apparatus is due to the very low resistance of the filter-coalescing device within 50 mm of water. The filtering outer surface of porous-cellular materials is able to delay the inclusion of the aqueous phase, in which the solids are usually accumulated, and the depth layers of the filter materials remain free from solids, do not require regeneration. If regeneration is necessary, the filter bag is easily washed with the reverse flow of the medium selected for washing.

In figure 2. in general terms, a part of the basic technological scheme of the proposed installation for removing droplet oil from associated gas is presented, which reflects only the first stage of gas separation, i.e. from the well to the torch.

The installation comprises a well 1, a group metering ladder with heating 2, ladders of the first separation stage 3, booster pumps 4, a collecting tank 5, an apparatus equipped with a PKU for separating drop oil from associated gas 6, a storage tank 7 and a flare device 8.

Installation works as follows. From the well 1 through the group measuring ladder with heating 2, the heated emulsified oil saturated with gases enters the separator ladders of the first separation stage 3. These large tanks can be counted from one or more, depending on the productivity of the well and the characteristics of the water-gas-oil mixture .

At a pressure of 6-7 atm. part of the gas is released from oil, which, according to the operating conditions of the well, remains for technological needs (as an energy resource).

The part of the gas separated at stage I under the conditions of the separation process takes droplet oil up to 50 or more g / m ³ into the gas line and therefore, to eliminate oil losses, gas from the first stage separator 3 enters apparatus 6, with a filter-coalescing device, where a deep separation of the gas and liquid phases occurs. Oil, accumulating in the apparatus, is fed through the drainage device to the storage tank 7, then to the collection tank 5 and then pumped to the further oil transport line to the central collection point (). Gas drained from drip oil inclusions passes through the pipe to the gas line and is supplied to the consumer of an already improved quality, and its excess when burning on flare 8 does not smoke, does not pollute the soil around the flare, and emissions contain significantly less harmful

gas harmful components, as their main supplier was oil.

The technical result consists in the fact that the proposed installation allows to increase the efficiency of deep separation of oil from associated gas, and to obtain significant savings from the return of separated oil, previously flared, to solve the problem of protecting the soil around flares and the air basin from gas emissions and products of incomplete combustion of oil .

Claims (1)

Installation for removing drip oil from associated gas, including a well, a group metering ladder, drainage separators for the first stage of gas separation from oil, booster pumps, a collection tank, characterized in that the installation is additionally equipped with an apparatus installed after the drainage separators of the first stage in front of the torch on the gas supply line for its combustion and made in the form of a tank equipped with a filter-coalescing device that overlaps the working section of the apparatus, and composed of a composition of materials - porous cell istyh metal and (or) alloy and (or) a porous-polymeric cellular material with a fixed-cell porous structure, as well as storage tank for receiving the separated oil and installed after the unit and connected with PKU conduit from modular tank.