Control device and method for intermittent pumping of oil pumping unit without shutting down

Abstract

The invention provides a control device for intermittent pumping of an oil pumping unit without shutting down. The control device comprises a controller, a frequency converter, an electromotor and the oil pumping unit which are electrically connected in sequence. An electric parameter collecting module is arranged on the controller. A rotating speed sensor is arranged on the electromotor. A load sensor, a displacement sensor and a crank position sensor are arranged on the oil pumping unit. For a low-liquid-amount and intermittent liquid outlet well, the control device provides the most reasonable control method according to the actual liquid outlet situation to meet supply-production coordination of the oil well, so that fine control is achieved, the operation efficiency of an oil well system is improved, energy consumption is lowered, automatic, safe and unattended intermittent pumping operation of a well field is achieved, and the problems of large management difficulty and time and labor consuming of site manual intermittent pumping are solved.

Description

technical field [0001] The invention relates to the field of digital equipment of a mechanical mining system, in particular to a non-stop intermittent pumping control device and method for an oil pumping unit. Background technique [0002] Changqing Oilfield is a typical "three-low" oilfield, with many low-production wells. By the end of 2014, the daily fluid production was less than 1.2m 3 There are 10,000 oil wells, accounting for 22.2% of the total number of wells opened. Due to the influence of low porosity and low permeability characteristics of the reservoir and the original pressure of the formation, low-yield and low-efficiency oil wells have poor reservoir physical properties and insufficient formation energy, which makes the seepage capacity of the oil layer small; low-yield and low-efficiency oil wells generally have small fluid volume and slow pressure recovery. If the flow time is long, the seepage velocity of the fluid is small, resulting in its liquid level r...

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Problems solved by technology

[0003] However, there are some problems in the remote automatic intermittent pumping control of oil wells: first, the liquid level fluctuates greatly, which affects the production

The second is that it is easy to cause the wellbore wax to overload and get stuck in the well. The up and down reciprocating movement of the sucker rod prevents wax accumulation in the tubing. The process of oil well suction is also a process of scraping wax.

Third, there are potential safety hazards. When the pumping unit stops working and starts up again, the automatic operation of the equipment may easily cause injuries to people and livestock.

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