RU2411409C1 - Procedure for collection and transporting multi-phase mixture from remote clusters of wells - Google Patents

Abstract

FIELD: oil and gas production. ^ SUBSTANCE: procedure consists in automated measuring installation and in track heater with units for gas withdrawal used as fuel for generation of electric energy at gas electric station and for heating liquid in track heater. Also, there is withdrawn such amount of gas which is required for generation of necessary amount of electric power and for liquid heating. The rest of gas is transported together with liquid to a collection centre by means of a multi-phase pump station. ^ EFFECT: reduced power consumption. ^ 1 dwg

Description

The invention relates to the oil industry, in particular to systems for collecting and transporting a multiphase mixture from remote well clusters with discharge of produced water at a wellbore and transporting a multiphase mixture to a central collection point (CPS).

A known method of transporting a gas-oil mixture, comprising separating water in a water separator with water drainage to a reservoir pressure maintenance system (PPD) and supplying a highly viscous oil-gas mixture in the form of an emulsion to receive a multiphase screw pump and transporting it to an oil treatment unit (patent RU 2239749 C1, 7F17D 1 | / 14, 2004).

The disadvantages of this method include the fact that the method does not solve the autonomy of the installation (external power supply is required), shallow dehydration of oil, since only free water is discharged in the water separator, and the rest of the water in the emulsion is supplied to the pump, as well as high energy consumption for pumping emulsions, since there is significant ballast of water in it.

A known method of transporting oil well products, including processing a gas-oil emulsion with a demulsifier before preliminary discharge of formation water at a wellbore and its subsequent separation into phases, treated with a demulsifier emulsion before preliminary discharge of formation water, is mixed with thermal gas-saturated water from a water well (see a.c. USSR No. 2076994, F17D 1/14, 1997, bull. No. 10).

This method allows you to dump produced water to a residual water cut of 2% and carry out the transport of oil and gas under pressure from well pumps.

The disadvantage of this method is that it also does not solve the question of the autonomy of the installation (requires external power supply). The use of Cenomanian water leads to increased capital and operating costs (well construction, well pump operation). The difficult operating conditions of the well pump (corrosive medium, sand, etc.) lead to its rapid failure. The location of well clusters at significant distances from the wellhead leads to increased pressure at the mouths of producing wells, which in turn leads to a decrease in their flow rate.

The technical task of the invention is to reduce energy consumption, complete utilization of the gas released on the bush in order to use it to generate electricity and heat, increase the efficiency of the process of producing produced water by using a track heater with a gas extraction unit, increase the flowing time, increase the production rate of wells by reducing pressure at the mouths of wells.

This is achieved by the fact that the oil transport installation at the well cluster is equipped with an automated gas metering unit (AGZU) and a track heater with gas extraction units, which is used as fuel for generating electricity and heat at a gas power station (HPP) and heating the liquid in a track heater. Moreover, such an amount of gas is selected that is required to generate the necessary amount of electricity and heat the liquid. The rest of the gas is transported along with oil to the central processing center.

Pressure reduction at the mouths of producing wells and the possibility of transporting well products (oil, water about 1% and residual gas content) over long distances is achieved by installing a multiphase pumping station after the sump, which pumps the oil and gas mixture through one pressure pipe to the central pumping station.

A decrease in pressure at the mouths of production wells will increase their flow rate, pumping oil with a low content of formation water (about 1%), with a residual gas content (the main amount of gas will be used to generate electricity and heat oil in the track heater on the bush) will significantly reduce energy the cost of pumping products to the DSP.

The drawing shows a schematic flow diagram of the collection and transport of a multiphase mixture from remote well clusters, including metering, treatment with a demulsifier, heating, discharge of produced water, external transport of dehydrated oil with a multiphase pump, characterized in that part of the gas is taken from the metering and heating stages to supply gas power plants generating electricity to fully support the entire pre-collection and transport process, where the residual gas is transported in a common stream by a multiphase pump catfish, which reduces the pressure on the site from the mouth of the producing wells.

The scheme according to the proposed method includes production wells 1, an automated metering unit with a gas sampling unit (AGZU) 2, a track heater with a gas sampling unit 3, a gas power station 5, a reservoir for discharge of produced water 4, a multiphase pump station 6, a reagent supply unit 7, multiphase flow meter 8 (see drawing).

The method is as follows. Well products 1 through flow pipelines enter an automated gas metering unit with gas sampling unit 2. After the gas-filling unit, a reagent demulsifier is added to the well products, then the well products are heated in a track heater with a gas sampling unit 3 and fed to a sump 4, where the reservoir is dumped water to a residual water cut of about 1%. The oil dehydrated in the sump 4 is fed to the suction of the multiphase pumping station 6 and then with its help through the multiphase flow meter 8 it is fed through the oil and gas pipeline to the central processing center. The gas separated in AGZU 2 through a gas pipeline 10 enters a gas power station (HPP) 5 to generate electricity and heat. The gas separated in the gas extraction unit of the track heater 3 is used as fuel in it. In the event of a shortage of gas to generate electricity in the hydroelectric power station 5, it is possible to supply part of the separated gas from the gas sampling unit of the heater 3 through the gas pipeline 9. The produced water 11 discharged in the sump 4 is supplied to the RPM system via the water conduit.

Thus, the proposed method has the following advantages:

1. The scheme for the proposed method provides for the autonomous operation of the equipment and excludes external power supply.

2. Allows you to completely utilize the gas selected on the bush to generate electricity and heat.

3. Reduces energy costs due to the lower volume of pumping of well products to the DSP.

4. The decrease in pressure at the mouths of wells allows to increase their flow rate, as well as to extend the period of flowing production wells.

5. Allows pumping of well products over fairly considerable distances, that is, to involve deposits that are farthest from developed infrastructure in the development.

6. There is no need to build a gas pipeline and overhead lines, which significantly reduces capital costs and the timing of commissioning.

7. Improving the environmental situation due to the lack of torches.

Claims (1)

A scheme for collecting and transporting a multiphase mixture from remote well clusters, including metering, treatment with a demulsifier, heating, discharge of produced water, external transport of dehydrated oil with a multiphase pump, characterized in that part of the gas is taken from the metering and heating stages to power a gas-fired power plant that generates electricity for full support of the entire process of pre-collection and transport, where the residual gas is transported in a common stream by a multiphase pump, which reduces the pressure in the area from the mouth of the production ling wells.