Application of borehole electric heating technology in high temperature oil well

Published on:

2023-05-10 10:31

Due to the high paraffin content and freezing temperature of the oil field in Weibei, Shengli field, during the production process, the pumping rod got stuck, broke and other abnormal production phenomena often occurred due to thick oil, paraffin deposition and heavy load, which is serious impact of mining. For this reason, Weibei Oilfield has introduced the electric heating technology of the borehole.

The fluidity of oil with a high pour point is extremely sensitive to temperature The typical viscosity curve of the high pour point oil temperature for this field is shown in the figure. On the viscosity-temperature curve, there is an inflection point (that is, the point of paraffin deposition, which is 40 ° C in the figure). When the temperature is higher than the inflection point, the high-temperature oil is the Newtonian liquid, and the viscosity-temperature ratio is mainly independent of the shear rate; when the temperature is lower than the inflection point, the high-solidification oil In the non-Newtonian liquid, the viscosity-temperature curve changes greatly, and the viscosity-temperature ratio is related to the shear rate. and the viscosity is higher at low shear rates. When the temperature is below the waxing temperature, the viscosity of the crude oil increases sharply. Therefore, increasing the temperature of crude oil by electric heating can effectively improve its fluidity.

The heating depth of an oil well depends on the oil well's fluid supply capacity and the difference in the physical properties of crude oil. The high pour point oil well of this oil well has poor fluid supply capacity, and the crude oil has a high pour point and a high paraffin content. When the temperature of crude oil at a certain location in the wellbore is lower than the paraffin deposition temperature, paraffin crystallization will be deposited in the crude oil; when the temperature is lower than the paraffin deposition temperature, paraffin deposition will occur in the oil. Good.

The hollow rod electric heating system should penetrate the inner hole of the hollow pump rod with the cable and form a loop with the hollow rod body, pass alternating current of different frequencies through itself, use the inner shell effect to generate thermal energy on the wall of the hollow rod, and heat the interior of the oil pipe through thermal conductivity. Crude oil is heating up everywhere, To increase the temperature of the crude oil in the pipe, reduce the viscosity of the crude oil and improve its fluidity, so as to efficiently extract crude oil with high viscosity, high freezing temperature and high paraffin content. When the inner cable of the hollow pump rod is powered by alternating current, an internal skin effect is created, the current flows down the inner wall of the hollow rod, and the outer wall is basically without current, which can be viewed as an insulator. To ensure labor safety.

When the inner cable of the hollow tubing rod is powered by alternating current, an internal skin effect is created, the current flows down the inner wall of the hollow rod, and the outer wall has basically no current, which can be thought of as an insulator. To ensure labor safety.

Shandong Huaning Company is engaged in new product design and development, product production, sales, engineering and maintenance, and service-oriented maintenance enterprise. Its technology and products are widely used in high viscosity oil, high condensation oil, heavy oil, water injection wells, screw pump wells, SAGD wells and other electric heating, as well as oil wells, gas wells, water well testing, etc. It is used for heating or heating pipelines at petrochemical enterprises, unlocking or thawing pipelines, boiler heating and other systems. It is an important partner of large and medium-sized oil fields such as Liaohe Oil Field, Shengli Oil Field, Daqing Oil Field, Horqin Oil Field, Xinjiang Oil Field, Changqing Oil Field, Zhongyuan Oil Field, etc. D. It is widely used for heating and heating pipelines, unblocking pipelines and thawing.

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