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Pumping well plunger effective stroke determining method based on finite difference method

A technology of plunger effective stroke and finite difference method, which is applied in construction and other directions, and can solve problems such as load fluctuations, impossibility, and large deviations in the calculation results of the curvature method.

Active Publication Date: 2018-07-03
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

Generally speaking, the application effect of the curvature method is better, but the complex downhole conditions will lead to different shapes of the work diagram. For the work diagram with serious load fluctuations and even buckling phenomenon, the calculation results of the curvature method have great deviations. Some are even impossible

Method used

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  • Pumping well plunger effective stroke determining method based on finite difference method
  • Pumping well plunger effective stroke determining method based on finite difference method
  • Pumping well plunger effective stroke determining method based on finite difference method

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the examples.

[0026] Such as figure 1 As shown, firstly, the WIA-PA data acquisition system is used to collect data, obtain the polished rod indicator diagram and convert it into a pump diagram, and obtain the downhole displacement curve with time, and then determine the effective stroke of the plunger based on the finite difference theory analysis method.

[0027] The method for determining the effective stroke of the plunger comprises the following steps:

[0028] Step 1: Through the load and displacement sensors installed on the pumping well, the load and displacement of the sucker rod of the pumping well are measured and collected.

[0029] Step 2: Transfer the collected data to the wellhead collector through the cable, upload to the main remote terminal control system RTU of the well site, and then transmit the collected data to the receiving center of the main station in the for...

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Abstract

The invention relates to a pumping well plunger effective stroke determining method based on a finite difference method. Firstly, data are collected through a WIA-PA data collecting system, a polishedrod indicator diagram is obtained and converted to a pump diagram, and the curve of change of the downhole displacement with the time is obtained; and then based on the finite difference theoreticalanalysis method, the effective stroke of a plunger is obtained. The pumping well plunger effective stroke determining method is suitable for an ordinary curvature method, can normally determine the effective stroke indicator diagram and still can accurately determine the effective stroke of the plunger as for certain indicator diagrams which are serious in load fluctuation and even kinked, compared with the curvature method, the application range is wider, and higher actual application value is achieved.

Description

technical field [0001] The invention relates to the technical field of oil measurement with a dynamometer chart, in particular to a method for determining the effective stroke of a pumping well plunger based on the finite difference theory and a WIA-PA digital acquisition system. Background technique [0002] With the vigorous development of digital oilfield construction in various domestic oilfields, the requirements for automatic collection and management of oil well production parameters are getting higher and higher. The remote wireless monitoring and software based on WIA-PA technology is applied to practice. Real-time monitoring of parameters such as stroke and stroke times, thus realizing the real-time test and acquisition of dynamometer diagram, and the online liquid production measurement function of oil well dynamometer diagram method. [0003] Whether the effective stroke of the plunger can be accurately determined is the key to the oil measuring technology of Gon...

Claims

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Application Information

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IPC IPC(8): E21B47/008
CPCE21B47/008
Inventor 于海斌曾鹏尚文利张立婷李世超
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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