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A device and method for measuring the start-up pressure gradient of fluid flow in polymer flooding reservoirs

A technology for starting pressure gradient and seepage. It is used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problem of low experimental reliability, long experimental time, and difficulty in flow control. Large and other problems, to achieve the effect of accurate calculation results, intuitive observation results, and convenient operation

Active Publication Date: 2019-05-21
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The constant pressure method requires a long stabilization time for each measurement point, and the experiment time is long, so it is difficult to guarantee the accuracy of the experiment; the unsteady method needs to measure the displacement pressure difference under multiple different flow conditions, the difficulty of flow control and the pressure difference. The measurement error is large; the capillary force involved in the capillary balance method cannot be measured, and the test period is long; the mercury used in the mercury injection method is different from the formation fluid properties, and the experimental reliability is not high; the plate model method is based on the unsteady state method A new method developed that has similar drawbacks to

Method used

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  • A device and method for measuring the start-up pressure gradient of fluid flow in polymer flooding reservoirs
  • A device and method for measuring the start-up pressure gradient of fluid flow in polymer flooding reservoirs
  • A device and method for measuring the start-up pressure gradient of fluid flow in polymer flooding reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, the sand-packing pipe 31 is used to simulate a reservoir with a permeability of 500mD, and the linear polymer with a concentration of 500ppm, 1000ppm, 2000ppm, and 4000ppm in the Bohai S oilfield is used as the experimental fluid to simulate the start of seepage when the linear polymer replaces the linear polymer. pressure gradient. Specific steps are as follows:

[0042] 1) Saturate the sand filling pipe 31 with 500ppm linear polymer SNF, place it in the oven 33, preheat it to 57°C, and let it rest for 2 hours.

[0043] 2) Drop a small amount of 500ppm linear polymer SNF into the toughened glass tube 11 at the inlet end and the toughened glass tube 12 at the outlet end to fill the pipeline.

[0044] 3) Gradually add 500ppm linear polymer dropwise to the toughened glass tube 11 at the inlet end, so that the liquid level in the toughened glass tube 11 at the inlet end rises by about 2 cm, and wait for 2 hours after the addition. drop and the liquid lev...

Embodiment 2

[0049] In this example, the sand-packing pipe 31 is used to simulate a reservoir with a permeability of 500 mD, and the concentration of the association polymer in the Bohai Z oilfield is 500 ppm, 1000 ppm, 2000 ppm, and 4000 ppm as the experimental fluid to simulate the displacement of the association polymer. The percolation initiation pressure gradient for the type polymer.

[0050] 1) Saturate the sand filling pipe 31 with 500ppm of associative polymer APP4, place it in the oven 33, preheat it to 65°C, and let it rest for 2 hours.

[0051] 2) Drop a small amount of 500ppm association polymer APP4 into the toughened glass tube 11 at the inlet end and the toughened glass tube 12 at the outlet end to fill the pipeline.

[0052] 3) Gradually add 500ppm of associative polymer dropwise into the toughened glass tube 11 at the inlet end, so that the liquid level in the toughened glass tube 11 at the inlet end rises by about 2 cm, and wait for 2 hours after the addition. If the su...

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Abstract

The invention provides a device and a method for measuring the starting pressure gradient of polymer-flooding reservoir fluid seepage. The device is characterized by comprising a pressure observation system; the upper part of an inlet end of the pressure observation system is communicated with a pressure control system; the lower part of the inlet end of the pressure observation system is communicated with an inlet end of a seepage environment simulation system; the lower part of an outlet end of the pressure observation system is communicated with an outlet end of the seepage environment simulation system; the inlet end and the outlet end of the seepage environment simulation system are respectively provided with a pressure sensor; the two pressure sensors are used for acquiring pressure signals in real time and sending the acquired pressure signals to a data acquiring and processing system by means of a signal transmission system; the data acquiring and processing system can be used for obtaining the starting pressure gradient of the fluid seepage according to the received pressure signals. The measurement method provided by the invention is visual, accurate and convenient, and can be widely applied to the measurement of the starting pressure gradient of the polymer-flooding reservoir fluid seepage.

Description

technical field [0001] The invention relates to the technical field of evaluation methods for oil and gas reservoirs in oil and gas field development, in particular to a measuring device and method for fluid seepage start-up pressure gradients in polymer flooding reservoirs. Background technique [0002] There are three main methods for determining the threshold pressure gradient, including indoor physical experiment simulation methods, indoor numerical simulation methods, and well test interpretation methods. Among them, the indoor physical experiment simulation method is adopted by many scholars because of its intuitive and convincing advantages. However, most of the experimental studies on the threshold pressure gradient are focused on water flooding reservoirs, and there is no research on polymer flooding reservoirs, resulting in unclear understanding of fluid seepage laws in polymer flooding reservoirs. [0003] At present, the commonly accepted methods for indoor phys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 曾杨康晓东张健赵文森崔盈贤唐恩高
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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