Method for determining liquid level in oil well with high temperature for extraction of high-viscosity oil

FIELD: oil and gas industry.

SUBSTANCE: method involves arrangement of an fibre-optic cable in a production well; determination of well shaft temperature; build-up of a temperature vs. well depth graph; indication on the graph of a temperature rise minimum by 10 degrees, which is the closest one to the well head; determination of depth of well liquid level as corresponding to depth of the indicated temperature rise.

EFFECT: determination of liquid level in a well with high temperature for extraction of high-viscosity oil.

1 dwg

 

The invention relates to the assessment of the level of fluid in oil wells and can be used to determine and control of static and dynamic level of the well fluid, for example, in an oil well.

There is a method of determining the level of fluid in an oil well, according to which form of pulsed acoustic signal at the wellhead in the annular space. Take reflected from the liquid acoustic echo. Convert it into an electrical signal. Determine the transit time of the acoustic signal from the wellhead to the liquid level, the provisions of sections with high and low acoustic density of the gas changes the distribution of sound velocity and position of the abnormal spatial inhomogeneities. Determine the liquid level depending on the values of sound speed on sections of the wells and the travel time of the acoustic signal from the wellhead to the liquid level. When this electrical signal is subjected to analog-to-digital conversion, and the digitized signal is subjected to Fourier transform at each current segment images in accordance with a mathematical formula. Carry out the construction of the graphical image of the spectrogram in the form of three-dimensional surfaces, which determine the location of internal and external heterogeneous the spines annulus. Determine a frequency at which the spectrum has the maximum value at a given time the position of the plot of the echogram. Determine the dependence of the sound velocity from the time given the distance between adjacent staff heterogeneity at a given time position plot showing the formula. As the liquid level in the well define a discrete integration of the functions of the sound speed in the interval from the wellhead to the liquid level (RF patent No. 2447280, publ. 10.04.2012).

The disadvantage of this method is the necessity of using special devices that are missing in the borehole during operation, the unreliability of definitions and sometimes the impossibility of definition of level in wells with high temperatures, producing high-viscosity oil, the frequent failure of the wavemeter due to the influence of high-temperature gas-vapor mixture from the annulus.

Know the use of fiber-optic wireline cables in oil producing wells to collect data about the well parameters (RF patent No. 2445656, publ. 20.03.2012 - prototype).

The disadvantage of this method is that in addition to other measurements in the borehole method is not capable of measuring the liquid level in the well.

In the proposed invention solves the problem of determining the liquid level in the well with high temperatures, mining is Yakovenko oil.

The task is solved by a method for determining the liquid level in the well with high temperatures, mining high-viscosity oil, including the placement of fiber optic cable into the production string, the determination of the temperature in the wellbore, the construction schedule depending on the temperature of the depth of the well, the selection on the graph leap temperature at least 10 degrees, the nearest to the mouth of the well, depth of the fluid level in the well as the corresponding depth of the selected temperature jump.

The invention

In high temperature wells, mining high-viscosity oil, the determination of the liquid level presents certain difficulties. Often instruments depth finders can not withstand high temperature, fail or give incorrect readings. In the proposed invention solves the problem of determining the liquid level in the well with high temperatures, mining high-viscosity oil. The problem is solved as follows.

Technology of production of heavy oil in order to periodically monitor the temperature inside of the production string place the fiber optic cable through which detect the temperature throughout the depth of the well. Build a graph of temperature against depth. The graph allocate leap temperature at least 10 gra the moustache, closest to the wellhead. Other temperature fluctuations do not take into account.

Determine the liquid level in the well as the corresponding depth of the selected temperature jump.

In the result it is possible to determine the liquid level in the high-temperature wells, mining high-viscosity oil.

Specific example

Through the oil hole with a horizontal stem extract oil with a viscosity of 3500 CST, watercut oil is 65 %, the oil output is 54 tons/day, the temperature of the oil varies from 90 to 140C. In the production string posted by fiber optic cable brand KOB-400-tip attached at the mouth to the metro OITS(optical meter temperature perturbations of the environment). Reading station is displayed on the control center field. Production lead centrifugal pump on the tubing pipe. According to the testimony with fiber-optic cable build a graph of temperature against depth. The graph presented in figure 1.

Figure 1 highlight the leap temperature at least 10 degrees that is closest to the wellhead. Determine the liquid level in the well as the corresponding depth of the selected temperature jump.

The liquid level in the well is 47 meters Comparative data on the wavemeter well confirmed set the config level.

The application of the proposed method will allow us to determine the liquid level in the well with high temperatures, mining high-viscosity oil.

The method for determining the liquid level in the well with high temperatures, mining high-viscosity oil, including the placement of fiber optic cable into the production string, the determination of the temperature in the wellbore, the construction schedule depending on the temperature of the depth of the well, the selection on the graph leap temperature at least 10 degrees, the nearest to the mouth of the well, depth of the fluid level in the well as the corresponding depth of the selected temperature jump.



 

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