SU1737223A1 - Method of transport of high viscosity crude oil jointly with casing-head gas and seam water - Google Patents

Abstract

SUMMARY OF THE INVENTION: Well bushes products are supplied to the main oil and gas stream, treated with a demulsifier, and the mixture with the underlying low-viscosity layer is transported. The production of one or several well clusters with a water cut exceeding the critical concentration of phase reversal is subjected to separation by introducing a de-emulsifier. After that, the separated oil-water and gas phases are directed by separate streams into the main flow. The critical concentration of the phase inversion of the processed products of the hive is reduced by thermal effects. 1 hp f-ly, 2 ill.

Description

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The invention relates to the oil industry, in particular to the in-field collection of oil well products.

Methods are known for transporting high viscosity oils together with water, which are realized by means of forced water supply to the pipeline and intended for the transport of single phase liquids.

The closest to the proposed is the method of transporting the water-oil-gas mixture, which includes supplying the products of well clusters to the main oil and gas stream, processing with a demulsifier, and transporting the water-oil and gas mixture with the underlying low-viscosity layer.

The disadvantage of the method is that to destroy stable emulsions, high costs of heat, demulsifier, as well as significant water costs are required to create a low-viscous underlying material.

layer required for the transport of water-oil mixture

The purpose of the invention is to reduce the cost of creating a low-viscous base layer, heat consumption and demulsifier.

The goal is achieved by the method of transporting high-viscous oil together with associated gas and reservoir water in the collection system and field transport of well production, the production of one or several pump slides with a water cut exceeding the critical concentration of phase reversal is subjected to separation by the introduction of a demulsifier, after which separated water and gas phases are directed by separate streams into the main oil and gas stream, with the critical concentration of phase reversal about ops demulsifier bush product is reduced by exposure to heat.

FIG. 1 and 2 are the flow diagrams of the possible implementation of the proposed method, carried out by various variants.

In the first embodiment (see Fig. 1), the production of wells from bushes 1 through supply pipelines 2 enters the main oil reservoir 3. Into the supply pipe of one of the bushes (or a group of bushes) whose production water content is higher than the critical concentration of phase reversal for the oil of the field, a demulsifier is fed through line 4. If there are no wells on a field with a water cut higher than critical, the bush with the highest water content is selected and its products in heater 5 are heated to a temperature at which the liquid phase separates into oil and water. In this case, a stratified gas-oil-water stream or gas-small emulsion of the oil-water type is formed in the inlet pipeline 2 from the bush (or group of bushes).

Gas and oil supply to the mixture are withdrawn from the supply pipeline at its end section 6 in separate streams and fed to the main oil collector 3, with gas through line 7 to its upper part, and oil-bearing mixture to line 8 to the bottom. At the same time, low viscosity of the oil supply to the mixture forms an underlying layer in the oil collector, which drastically reduces hydraulic resistance in it, ensuring efficient transport of high viscosity products.

According to the second variant (see Fig. 2), the oil and gas tray from groups of bushes 1 via pipelines 2 enters a booster pump station (CSN), consisting of a separation stage and pump 4, which pumps a partially degassed product to oil pipeline 5, through which the main oil - Tegazovodny flux is transported to the central collection point. The products of the well cluster group, whose water content exceeds the critical concentration of phase reversal, are directed to the separator-separator 6, in which the gas is separated, sent it to the main gas flow from the DNS through line 7, and a low-viscosity oil-water mixture (oil-type emulsion in water), directed it by pump 8 to the lower part of the pipeline 5. The product is processed by the de-emulsifier by introducing it via line 9.

In the absence of well clusters with a water content above the critical level, a group of bushes with

most watering and heat its products, install the heater 10 in front of the separator-separator 6, PRI me R 1 (prototype). Products

The Yaunlorsky field in Western Siberia, transported through oil-gathering pipelines, has a viscosity of 5000 mPa-s at a transport temperature of 10 ° C and a water cut of 60%, which causes a decrease in the throughput capacity of oil pipelines. So, when pumping CSN products with a flow rate of 2.5 thousand meters per day over an oil pipeline with a length of 10.8 km and a diameter of 0.3 m, the pressure drop is 7.5 kg / cm per 1 km of the pipeline, which leads to the termination of the pumps not designed for this pressure (75 kg / cm). The critical concentration of the inversion phase of the emulsion of the Yaunlor field for these conditions is 75%.

To reduce the hydraulic resistances, a separol type 5084 demulsifier is introduced into the initial part of the pipeline.

the amount of 20 g / t of oil and heated to 20 ° C. In this case, a decrease in the critical concentration of the phase reversal, separation of the water-oil mixture, and the underlying water layer is formed.

The pressure at the beginning of the pipeline at

This is 18-19 kg / cm, i.e. the pressure drop is reduced almost 5 times.

With the introduction of the demulsifier without heating (ie, at a temperature of 10 ° C)

the mixture does not occur at this water cut, and there is no decrease in viscosity.

PRI me R 2 (the proposed method). One of the flows of oil and gas mixture with

A flow rate of 500 m3 / day, coming from a group of well shrubs with a total water cut of 80%, is treated with a separol 5084 deemulater in an amount of 30 g / t of oil and fed to a separator / water separator where the gas and oil supply are separated into a mixture (emulsion like oil in water ) with a viscosity of 10 mPa s. This mixture is introduced into the lower part of the main oil pipeline transporting a water-oil emulsion with a water content of 60% at 10 ° C. As a result, the pressure in the initial section of the pipeline decreases to 18-19 kg / cm2 (without supplying a low-viscosity mixture, the pressure at the beginning of the pipeline is 75 kg / cm, as shown in Example 1).

Primerz (the proposed method). One of the streams of the oil and gas mixture with a flow rate of 500 m3 / day. Arriving at the well bushes with a water content of 70%,

treated with a separator type separ 5084 in an amount of 20 g / t of oil.

Due to the fact that the water content of the product being processed (70%) is lower than the critical concentration of phase reversal at a given temperature (10 ° C), the flow is heated to 25 ° C and then fed to a water separator where the gas and oil well per mixture (oil-in-water emulsion type) with a viscosity of 8-10 MPa-s. This mixture is introduced into the lower part of the main oil pipeline transporting a water-oil emulsion with a water content of 60% at 10 ° C. As a result, the pressure decreases at the initial section of the pipeline to 18-19 kg / cm.

Thus, the implementation of the proposed method will reduce the consumption of the de-emulsifier and heat by 4-5 times compared with the prototype due to the processing and heating of only a part of the high-viscosity products supplied from one or several well clusters. The method does not require the addition of water to reduce the hydraulic resistances in the system for transporting high viscous products, l.

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Claims (2)

1. A method of transporting high-viscous oil together with associated gas and reservoir water in the collection system and field transport of well products, including supplying the products of well clusters to the main oil and gas stream, processing by demulsifier and transporting the water-oil-and-gas mixture with the underlying low viscosity layer, characterized by that, in order to reduce the cost of creating a low-viscous base layer, heat consumption and demulsifier ,. The production of one or several well clusters with liquid water content exceeding the critical concentration of phase reversal is subjected to delamination by introducing a demulsifier, after which the delaminated water-oil and gas phases are directed by separate flows into the main oil and gas stream. 2. A method according to claim 1, characterized in that the critical concentration of the phase reversal of the processed products of the hive is reduced by thermal action. 0 from group bushes from rpynnv bushes 9 1C P6 FIG. 2