Calculation method and system of daily fluid production of oil well pump in the state of Vail leakage

Abstract

The invention discloses a method and a system for calculating a daily fluid production rate in a valve leakage state of an oil pump. The calculation method comprises the following steps of determining an effective stroke of an underground plunger pump in the valve leakage state, i.e. the daily fluid production rate is calculated regardless of the influence of valve leakage within the effective stroke; calculating instantaneous leakage by virtue of a closing point, determined after the valve leakage of the plunger pump, of a fixed valve or a floating valve, and calculating daily valve leakage according to the instantaneous leakage; subtracting the daily valve leakage from the daily fluid production rate calculated regardless of the influence of valve leakage within the effective stroke to obtain the daily fluid production rate in the valve leakage state of the plunger pump. The calculation system comprises a module for calculating the daily fluid production rate regardless of the influence of valve leakage within the effective stroke, a daily valve leakage calculation module and a module for calculating the daily fluid production rate in the valve leakage state. According to the method and the system, the shortcomings of a conventional indicator diagram metering method are compensated, and the indicator diagram metering accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of fluid production calculation for pumping wells, in particular to a method and a calculation system suitable for calculating daily fluid production by using actual dynamometer diagrams after Verle leakage occurs in beam pumping wells. Background technique [0002] In the process of oil field development, when the oil well loses its self-spraying ability and enters the stage of mechanical production, the commonly used oil production method is the downhole rod reciprocating plunger pump matched with the pumping unit for production. . Gongtu method measurement began to be applied in the 1990s and gradually replaced the separator to measure liquid production. Compared with separator measurement, this technology has advanced technology, simple ground equipment and supporting processes, and low operation and maintenance costs. It has been widely used in domestic oil fields, but in practical application, this te...

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Problems solved by technology

[0003] (1) When the Wells leakage occurs in the well pump, the calculation result of liquid production is wrong. Even when the oil well does not actually produce liquid due to the Wells loss, the calculation result of liquid production measured by the work diagram method shows that the oil well still has a certain amount of fluid production. The liquid production capacity is inconsistent with the actual production situation

[0004] (2) There are two types of valve leakage in oil well pumps. One is that foreign objects are stuck between the valve ball and the valve seat, so that the valve cannot be closed. Distinguishing and judging; the second is that the contact surface of the Valve ball or the Valve seat is damaged, so that the valve seat and the Valve ball are not tightly matched. Seriously, at this time, the measurement error of the work diagram method is also increasing, and the fluid production rate at the wellhead of the oil well is gradually decreasing, while the result of measuring the liquid production rate is gradually increasing, which is contrary to reality. The measured liquid production will cause errors in the production trend of oil wells, which is extremely unfavorable to the analysis of oil wells and well groups

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