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A method for determining the running depth of the heating cable through the hollow sucker rod

A hollow sucker rod and heating cable technology, which is used in earth-moving drilling, isolation devices, measurement, etc., can solve the problems of reducing oil pumping load, difficulty in lifting, reducing viscosity of high-point and high-wax crude oil, etc., to reduce labor intensity. , The effect of saving production and operation costs

Inactive Publication Date: 2017-09-29
马瑞程
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Establish the mathematical model of wellhead oil outlet temperature and depth and solve it to determine the most suitable depth for the hollow sucker rod heating cable to run into, give full play to the heat source efficiency of the heating cable, ensure that the crude oil in the tubing is fully heated, and reduce the viscosity of high pour point and high wax crude oil , reduce the pumping load, and overcome the problems of difficult lifting in the wellbore and high energy consumption when producing high pour point and high wax crude oil

Method used

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  • A method for determining the running depth of the heating cable through the hollow sucker rod
  • A method for determining the running depth of the heating cable through the hollow sucker rod
  • A method for determining the running depth of the heating cable through the hollow sucker rod

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Embodiment Construction

[0056] Taking Well Yan 63-159 as an example to determine the running depth of the heating cable through the hollow sucker rod, it will be described in detail.

[0057] Physical properties of crude oil from Well Yan 63-159: density at 20°C, 0.932g / cm 3 , 50°C viscosity 956.4mPa·s, freezing point 37°C, wax content 31.8%, well depth 2995.7m, daily oil production 12t / d, daily water production 13t / d, pump parameters φ38mm×1929.28m.

[0058] Step 1. Collect the oil well parameters to be lowered into the hollow sucker rod, the technical parameters of the hollow sucker rod and the technical parameters of the heating cable:

[0059] 1. Oil pipe outer diameter D, 73mm;

[0060] 2. Crude oil pour point temperature t n , 37°C;

[0061] 3. Wellhead oil outlet temperature T 井口 , 40°C;

[0062] 4. Oil production Q of oil well o , 12t / d;

[0063] 5. Oil well water production Q w , 13t / d;

[0064] 6. Geothermal gradient g T , 3°C / 100m;

[0065] 7. Reservoir temperature t r , 89°C;

...

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Abstract

The invention discloses a method for determining setting depth of a heating cable passing a hollow sucker rod. The method is applied to high-solidification-point high-wax-content crude oil wells of oil fields, and the heating cable is enabled to go down into a hollow of the hollow sucker rod for heat-tracing heating oil production. The method includes collecting oil well parameters and technical parameters of the hollow sucker rod waiting for being set; building a conventional oil pumping well temperature drop model and a heat-source oil pumping well temperature drop model; constructing according to setting depth calculated by the models, and checking polished rod load of an oil pumping machine. The method has the advantages that under the premise that maximum polished rod load of the oil pumping machine is met, normal production of oil wells larger than 35 DEG C in solidification point; thermal washing and chemical adding are not needed, effective time efficiency of the oil wells is improved by 10% averagely, production and running cost is saved, and labor intensity of staff is reduced.

Description

technical field [0001] The invention relates to the technical field of oil production in oilfields, in particular to the technical field of oil recovery by heating a hollow sucker rod in a high-condensation and high-wax crude oil well, and relates to a method for determining the running depth of a heating cable through a hollow sucker rod. Background technique [0002] During the production process of high pour point and high wax crude oil wells, due to the poor physical properties of crude oil, the suspension point load of the pumping unit is likely to increase, and it is difficult to restart pumping in the case of power failure and shutdown, which increases the difficulty of oil well maintenance. At the same time, some wells Without wellbore heating technology, normal production cannot be done at all. Running the hollow sucker rod to a certain depth in the oil well and auxiliary cable heating can solve the practical problems on site, but the depth of the drilling is often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/04
CPCE21B36/04
Inventor 马瑞程
Owner 马瑞程
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