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

A technology of a control device and a control method, which is applied to earth-moving drilling, production of fluids, wellbore/well components, etc., can solve problems such as injury to personnel and livestock, impact on production, wax deposition on the inner wall of oil pipes, etc. The effect of improving operation efficiency and fine control

Active Publication Date: 2017-07-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In order to overcome the problems existing in the remote automatic intermittent pumping control of oil wells, this embodiment provides a method such as figure 1 The shown oil pumping unit non-stop pumping control device includes a controller 1, a frequency converter 2, a motor 3 and a pumping unit 4 that are electrically connected in sequence. The controller 1 is provided with an electric parameter acquisition module 5, and the The motor 3 is provided with a speed sensor 6 , and the pumping unit 4 is provided with a load sensor 7 , a displacement sensor 8 and a crank position sensor 9 .

[0041] The working principle of the non-stop pumping control device for this pumping unit provided by the present invention is as follows:

[0042] The rotational speed sensor 6, the load sensor 7, the displacement sensor 8 and the crank position sensor 9 send the motor speed, the load, displacement and crank position data of the pumping unit to the controller through wireless transmis...

Embodiment 2

[0046] On the basis of Example 1, this embodiment provides a control method for intermittent pumping without stopping the pumping unit. For wells with low fluid volume and intermittent fluid output, the most reasonable control method is given according to the actual fluid output to meet the requirements of oil wells. Supply and production coordination, at least including the following steps:

[0047] Step 1) According to the liquid production rate of the oil well, judge the cumulative stoppage time of the oil well in one day;

[0048] When the production of the oil well is ≤1t / d, the accumulative shutdown time of the oil well is 12 hours a day;

[0049]When the production of the oil well is 1t / d~1.5t / d, the accumulative pumping stop time of the oil well is 8 hours a day;

[0050] When the production of oil well is 1.5t / d~2t / d, the accumulative shutdown time of oil well is 6 hours a day.

[0051] Step 2) Preliminarily take half an hour as a working cycle of a pumping unit. Ac...

Embodiment 3

[0069] This embodiment provides a pumping unit non-stop pumping control method:

[0070] First, according to the fluid production of the oil well, determine which of the following conditions the oil well belongs to:

[0071] When the production of the oil well is ≤1t / d, the accumulative shutdown time is 12 hours;

[0072] When the oil well production is 1t / d~1.5t / d, the accumulative pumping stop time is 8 hours;

[0073] When the oil well production is 1.5t / d~2t / d, the accumulative shutdown time is 6 hours.

[0074] Taking liquid production less than 1t / d as an example, the accumulative pumping stop time is 12 hours, with half an hour as a cycle, the well is opened for 15 minutes and swings for 15 minutes. Given the initial state value, open the well for 15 minutes and swing for 15 minutes. By judging the fullness of the dynamometer of the polished rod, when the fullness of the dynamometer is less than the limit value (adjustable parameters), such as when the fullness is les...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/12
CPCE21B43/12E21B43/127
Inventor 辛宏周志平甘庆明陆梅李大建张磊韩二涛刘涛张岩杨海涛刘天宇魏韦呼苏娟
Owner PETROCHINA CO LTD
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