A method for calculating the minimum negative pressure for oil well plugging removal and the method for plugging removal negative pressure
A minimum and negative pressure technology, applied in the field of calculating the minimum negative pressure for unplugging oil wells, and the field of unplugging negative pressure, which can solve the problems that the calculation method cannot be applied to the real situation, and errors are prone to occur.
Active Publication Date: 2021-12-14
CHINA PETROLEUM & CHEM CORP +1
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[0004] The purpose of the present invention is to provide a method for calculating the minimum negative pressure for oil well plugging removal and a method for removing plugging negative pressure, which are used to solve the problem that the existing minimum negative pressure calculation method cannot be applied to the real situation and is prone to errors
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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0049] In the process of oil well production, due to the production change, the skin factor in the near-wellbore area gradually increases, and the additional pressure drop generated has an impact on the negative pressure design; The skin factor and additional pressure drop caused by the production change are used to correct the minimum negative pressure calculated by the existing negative pressure calculation method.
[0050] Such as figure 1As shown, first collect the parameters needed to calculate the negative pressure, and calculate the initial minimum negative pressure; then use the cyclic iteration method to calculate the skin factor and additional pressure drop caused by the production change, and finally correct the minimum negative pressure...
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The invention relates to a method for calculating the minimum negative pressure for oil well plugging removal and the method for removing plugging negative pressure. By calling the output and pressure difference of normal production, the skin factor and additional pressure drop caused by the change of output are calculated by using a cyclic iteration method. The minimum negative pressure calculated by the existing negative pressure calculation method is corrected to obtain a more accurate minimum negative pressure. The method provided by the invention takes into account the influence of the additional pressure drop on the negative pressure design due to the gradual increase of the skin factor in the near-wellbore zone due to the change in production during the production process of the oil well; The calculation method is based on the calculation method of the initial minimum negative pressure to correct the initial minimum negative pressure, and then through comparison, selection and optimization, the optimal minimum negative pressure for plugging removal is obtained. The method provided by the invention solves the problem that the existing minimum negative pressure calculation method cannot be applied to real situations and is prone to errors.
Description
technical field [0001] The invention belongs to the technical field of oil field information construction, and in particular relates to a method for calculating the minimum negative pressure for oil well plugging removal and a method for removing plugging negative pressure. Background technique [0002] During the production process of the oil well, due to factors such as formation fluid movement, fine silt migration, water cut increase, and production pressure difference amplification, the permeability of the near-wellbore zone decreases and the skin factor gradually increases. At this time, an additional pressure drop will be generated to organize the formation. Fluid flows to the wellbore. The above phenomena will lead to a decline in oil well production, so it is necessary to take plugging removal measures to restore the permeability of the near wellbore zone of the oil well. Nitrogen bubble exhaust negative pressure plugging removal technology has the advantages of sim...
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IPC IPC(8): G06Q10/04G06Q50/02E21B37/00
CPCG06Q10/04G06Q50/02E21B37/00
Inventor 刘正奎刘洪涛冯兴武孙彬峰周皓宾常李博解勇珍安军辉
Owner CHINA PETROLEUM & CHEM CORP