A kind of oil well intelligent control method and device

Abstract

An intelligent oil well control method and device, the control method comprising: step 1: setting the depth of the oil surface; step 2: detecting the casing pressure in the oil well, and if there is casing pressure in the well, controlling the gas in the oil well casing to release gas outside the well Make sound, get the depth of the oil level according to the speed of sound and time difference; if no casing pressure is detected in the casing of the oil well, pressurize the gas in the casing outside the well into the gas storage cylinder, then inject gas into the casing of the oil well to make sound, and then get the oil The depth of the oil surface; step 3: compare the actual measured oil surface depth with the set oil surface depth, and determine whether to pump oil according to the error value of the two. The invention also includes an intelligent oil well control device. On the one hand, the present invention can make full use of the pressure difference in the oil well to accurately obtain the specific position of the oil level, and improve oil production efficiency through intelligence; The safety and service life of the start-up when the oil motor is used.

Description

technical field [0001] The invention relates to the technical field of oil field pumping, in particular to an intelligent control method and device for an oil well. Background technique [0002] Sucker rod is an important part of rod pumping equipment. The sucker rod is generally connected into a sucker rod string through a coupling, the upper part is connected to the pumping unit through the polished rod, and the lower part is connected to the plunger of the oil well pump. . When the pumping unit is working, the motor drives the donkey head of the beam to reciprocate, and then the donkey head drives the polished rod and the sucker rod to reciprocate linearly up and down, and then transmits this movement to the piston in the downhole oil pump through the sucker rod . [0003] Before the sucker rod pumps oil, it is necessary to know the position of the oil level in the well. When controlling the oil level to recover oil, if the oil level is too deep, it will not be easy to...

AI Technical Summary

Problems solved by technology

[0004] In addition, when the existing sucker rod stops working, it usually stops at the lowest point of the sucker rod movement, which will have the following defects: (1) Once the sucker rod starts to work again, the sucker rod will move upward first, and the sucker rod will move upwards. The counterweight of the rod in the well is relatively large, and when the sucker rod moves upward, it must overcome a certain gravity, which requires the motor to generate a large starting current at the moment of starting.

However, on the one hand, the large starting current will cause the motor winding to heat up and the insulation will age, thereby shortening the service life of the motor; on the other hand, it will cause fluctuations in the grid voltage, which will affect the normal operation of other equipment connected to the grid; (2) When the sucker rod moves upward, it is easy to cause the sucker rod to break, which greatly wastes the cost; (3) The sucker rod moves upward first, which will prolong the pumping time, reduce the work efficiency, and then reduce the pumping output, which will affect the profit of the enterprise

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