RU1783227C - Method of oil-and-gas collection - Google Patents

Abstract

SUMMARY OF THE INVENTION: The diameter of the pipeline is selected on the basis of hydraulic calculation and, during operation of the system, provides an overview of the emulsion flow regime of the transported fluid at a flow rate that prevents the loss of water. The operation of the collection is carried out in three stages using stepwise commissioned two parallel pipelines. In the first stage, all well products are transported in a single pipeline until the product is resistant to delamination and no water falls out of it. At the second stage, upon reaching water cut, a second pipeline is introduced and oil is transported through it with a residual water and gas content, and through the first, water and residual gas discharged from the wells. In the third stage, when the flow rate of the wells is reached, when the flow rate in the second pipeline does not provide the rate of water accumulation, oil with residual gas and water content is transported in the first pipeline, water and discharged gas in the second. The removal rate in the first pipe is maintained by controlling the gas discharge. 1 tablet, 1 ill. WITH

Description

The invention relates to the transport of gas-oil-water mixtures through pipelines and can be mainly used in the collection of well products in oil fields

The purpose of the invention is to increase efficiency due to optimal loading of the pipeline.

The goal is achieved in that the collection system is carried out in three stages using stepwise commissioned two parallel pipelines, while in the first stage all the production of wells is transported through one pipeline until the product is resistant to delamination and water does not fall out of it, second

the stage, upon reaching the water cut of the product, causing its stratification in the stream, a second pipeline is introduced and oil is transported through it with a residual water and gas content, and through the first, water and residual gas discharged from the wells, in the third stage with a falling flow rate of the wells, when the flow rate the second pipeline does not provide the rate of water accumulation; oil with residual gas and water is transported through the first pipeline, and water and discharged gas are transported through the second, and the discharge velocity in the first reservoir under hold by regulation of gas discharge.

The drawing shows a graph showing how the production of wells in an oil field, which is a mixture of oil, gas and water, and changes during the operation of the field.

The calculation results of a 10 km long reservoir section for oil from the Samotlor field with a change in the flow rate of wells in time, shown in the drawing, are shown in Table 1.

The method is implemented as follows.

At the first stage of operation (see the drawing, Table 1), 0.9 million tons / year is laid in a pipeline with a diameter of 426x8 mm to collect all the production of wells (oil, gas and produced water). With a gas factor of m3 / m3, a necessary discharge speed of .4 m / s L / Out 1.2 m / s is provided with an allowable pressure drop of 3 × 10 n / m2 20.0 × 105 n / m2.

With a further increase in water cut and the introduction of a gas lift (gas factor becomes 136), this pipeline will no longer cope with the transport of well products. Then, at the beginning of the second stage of operation, a collector of 529x8 mm pipes is laid parallel to the current one and the produced mixture is transported through it. At the same time, the mixing speed m / s L / take-out 1.44 s and having already appeared in sufficient quantity does not drop out of the transported mixture. The pressure drop AP 6.02x105n / m2 is also within acceptable limits.

With a further increase in oil production and its water cut, water separation begins using 426x8 mm pipelines and water separators and regulates flows using a partial discharge of gas into the same pipe. At the same time, with a maximum oil production of 3.4 million tons / year and discharged at this water in the amount of 1.2 million tons / year and gas in the amount of 66 m / m also provides the necessary modes of movement. The necessary mixture speed is provided in the oil pipeline, 386 M / s WBbiH 1 17 m / s with pressure drop A, 1x105 n / m

In the water conduit also Д Р 16.6х105 n / m2, 0х1 0 n / m. In this case, the water line is inhibited, s.

At the end of this period, when oil production drops to 1.9 million tons / year, and water cut exceeds 65% in the G 529x9 mm pipeline transporting oil with a water content by supplying all gas (m / m3) to it, it is possible maintain the anticorrosive flow pattern, 5 m / s L / Val 1.44 m / s.

With a further drop in oil production, it is necessary to move to the third stage

operation, when oil with residual water content will be transported through the pipeline (t 426x8 mm. An example of calculation is given when oil is transported through the pipeline in an amount of 1.0

million tons / year with a gas factor of 186m3 / m3 due to the introduction of the second stage of gas lift. At the same time, the WCM mixture speed is 1.865 m / s L / take 1.45 m / s with a pressure drop in the pipeline, 2x105

n / m2.

At the same time, about 4.0 million tons of produced produced water is transported annually with a 529x9 mm pipeline at a pressure drop of D P of 0.88x10 n / m2.

All intermediate flow regimes of products through pipelines arising from changes in flow rates and water cut over time are ensured by controlling the gas discharge in the manner described above.

Technical and economic comparisons of existing and proposed technologies show that the proposed cost-effectiveness option is beneficial both in terms of capital

investment in construction as well as operational costs. At the same time, the need for deficient inhibitors is sharply reduced.

Claims (1)

The claims The method of oil and gas collection, which consists in choosing the diameter of the pipeline based on hydraulic calculation and providing an emulsion flow regime during operation of the collection system transported fluid at a flow rate that prevents water loss, characterized in that the operation of the collection system is carried out in three stages using stepwise commissioning of two parallel pipelines, while in the first stage all the production of wells is transported through one pipeline until the production resistant to delamination and does not fall out of it water, in the second stage, upon reaching the water cut of the product, causing it to stratify in the stream, a second pipeline is introduced and oil is transported through it with a residual water and gas content, and the first is water and residual gas discharged from the wells, in the third stage, when the flow rate of the wells decreases, when the flow rate in the second pipeline does not provide the rate of water accumulation, oil with residual gas and water is transported through the first pipeline, and water and discharged gas through the second moreover, the speed of removal in the first pipe support regulation of gas discharge. The flow regimes of production of wells in pipelines Note mm diameter of the pipeline, mm Q / 1.-fluid flow rate, mln.t / year G-gas factor, m3 / m3 J3 - gas consumption  - mixture speed, m / s Uy & g-speed of removal, m / s DR - pressure drop, n / m2x10 f smadi 2 stages 1 to § liquid 2- doig / cha nerlm with the remainder of the iodine 3- soda / ethany eaZa 4- §§ & one nave / rw 3 stages