Oil well intelligent control method and device

Abstract

Disclosed is an oil well intelligent control method and device. The oil well intelligent control method comprises the following steps that 1, the depth of an oil liquid surface is set; 2, the casing pressure in an oil well is detected, if the casing pressure exists in the well, air in a casing pipe of the oil well is controlled to be deflated and produce sound to the outside of the well, and according to the difference of sound velocity and time, the depth of the oil liquid surface is obtained; if it is detected that the casing pressure does not exist in the casing pipe of the oil well, the air in the casing pipe is pressurized into an air storage cylinder at the outside of the well, then air injection and sound production are conducted to the interior of the casing pipe of the oil well, and the depth of the oil liquid surface is obtained; and 3, the practically-measured depth of the oil liquid surface is compared with the set depth of the oil liquid surface, and according to the error value of the practically-measured depth of the oil liquid surface and the set depth of the oil liquid surface, whether oil pumping is conducted or not is determined. The invention further comprises the oil well intelligent control device. According to the oil well intelligent control method and device, on the one hand, the pressure difference in the oil well can be utilized fully to accurately obtain a specific position of the oil liquid surface, and through intelligent control, the oil extraction efficiency is improved; on the other hand, impact force of a sucker rod and starting current of an electromotor during starting can be reduced, and the safety of starting during using a sucker motor and the service life are improved.

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...

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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

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