SU1495562A1 - Method of piping oil - Google Patents

Abstract

The invention allows to reduce the energy consumption for the transportation of oil. The pipeline transports oil with unseparated formation water with its content in the flow of 3-10% by volume. Transportation is carried out in a mode with Reynolds numbers in the range of 50,000 - 70,000, which ensures the creation of a stable water-oil emulsion.

Description

The invention relates to the field preparation of oil and its transport through trunk pipelines, and can also be used in the refining and chemical industry.

The purpose of the invention is to reduce the energy consumption for oil transportation.

The goal is achieved by using non-separating formation water with an average concentration of 3–10% by volume as a less viscous fluid, and the flow regime is set with a Reynolds number interval of 50000–70000. Average transport speed is determined by formula

Re

and

m

where and - average transport speed

tirovki;

Re is the Reynolds number J equals 50,000 to 70,000;

 - kinematic viscosity

oil;

D is the diameter of the pipeline. In the turbulent mode of motion in the specified interval of Reynolds numbers, the remaining water after pre-discharge of the reservoir forms a stable water-in-oil emulsion of a certain dispersion and uniform distribution of concentration over the vertical section of the pipeline. In this case, the size of the dispersed phase is several orders of magnitude smaller than the sizes of turbulent formations or turbulent moles, whose behavior determines the structure of the turbulent-flow and the magnitude of the relative stresses determined by the formula.

  - pu v.,

where o is tangent; p is the density of the continuous phase;

(L

and

I

v

pulsation lengthwise

speed;

transverse pulsation

speed.

In the process of turbulent pulsation motion, the discrete volume of the continuous phase (mol) entrains foreign particles (emulsified droplets of produced water) and inhibits the total drag force, which is why the pulsating components and V speeds turbulent flow decreases, and consequently, the tangential stresses that determine the magnitude of the hydraulic resistance also decrease. This quenching of turbulent pulsations of a continuous flow with a dispersed phase, called the laminarization effect of turbulent flow, reduces the hydraulic resistance during the movement of a two-phase flow of oil-formation water compared to the hydraulic resistance when moving along a pipeline of one oil. In this case, the residual volume concentration of the reservoir

Method of transportation of oil

The wells that are objectively present in the oil during its production from the well, the medium mainly Koturttepinskaya, at the speed of the continuous phase flow, creating the conditions for the formation of a stable water-oil emulsion of a certain dispersed composition are rigidly connected to each other. . The use of regimes with Reynolds numbers Re 50000 does not give a uniform distribution of the concentration of the dispersed phase over the cross section

35

a pipeline in the presence of a small, oil-insoluble liquid, which is different in that, in order to reduce energy consumption for transport, less-than-liquid liquid uses inseparable formation water with a content of 3-10% by volume, and transports in the mode when the numbers Re

pipe, and the effect of laminarization of the in-noldsa in the range of 50000-70000.

ten

 . 25 55624

It is weak. When using Reynolds numbers of Re 70000, even distribution of droplets over the channel cross section is observed, but the effect of laminarization is also weak, which is caused by a significant decrease in the droplet diameter to the size at which the droplets are completely entrained by the turbulent flow and exert low impact. With an average water concentration of less than 3% of the effect of reducing the hydraulic resistance, 5 were not observed, which is explained by the small number of droplets affecting the flow, and an increase in the water concentration of more than 10% results in an increase in the hydraulic resistance of the two-phase flow compared to single-phase, which can be lost amending the mechanism of the effect of a large number of droplets on the flow with increasing turbulence of the latter as they flow around.

20

Claims (1)

Invention Formula Method of transportation of oil property Koturtepinskoy, on mainly Koturtepinskaya the pipeline in the presence of a low-viscosity, oil-insoluble liquid, which is the fact that, in order to reduce energy consumption for transport, non-detachable formation water with a content of 3-10% by volume is used as a less viscous liquid, and in Rey mode Compiled by I.Peto N. Editor I.Derbak Tehred A. Kravchuk .. Proofreader O. Kravtsov Order 4239/35 Circulation 433 VNIIPI State Committee for Inventions and Opportunities under the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Subscription