An open experimental device and method for simulating single-slug plugging removal process

An experimental device and process technology, applied in the direction of measuring device, chemical method analysis, weighing by removing certain components, etc., can solve the problems of complex experiments, large differences in clogging degree, long experimental cycle, etc., and achieve experimental repetition Good performance, reduce human error, and short experiment period

Active Publication Date: 2022-03-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is following deficiency in this method: 1) can not quantitatively evaluate the dynamic situation of blockage change with time
This method has the following shortcomings: the permeability of different cores is different, resulting in poor repeatability and poor experimental regularity; plugging simulation is through direct injection of high-concentration polymer, which is quite different from the actual plugging degree of polymer injection wells / production wells; More complex, more preparation work, long experiment period, high cost of core production; in addition, it is impossible to simulate the difference of blockages at different nodes

Method used

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  • An open experimental device and method for simulating single-slug plugging removal process
  • An open experimental device and method for simulating single-slug plugging removal process
  • An open experimental device and method for simulating single-slug plugging removal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The single-node blockage circulation flushing simulation method is used to optimize the type of plugging agent and parallel experiments. The operation methods are as follows:

[0085] Step 1: Connect the outlet of the liquid supply pump 10 to the flushing nozzle 4, and connect the outlet of the liquid collecting funnel 7 to the constant temperature tank 15;

[0086] Step 2: The constant temperature tank 15 is loaded with a plugging remover; the plugging remover is 600 g of ammonium persulfate prepared with a concentration of 1%; the temperature is set to the downhole plugging removal temperature of 60°C;

[0087] Step 3: The measuring cup 5 is fixed on the measuring cup fixing frame 3, the control device 17 controls the mass sensor 2 to clear the zero; the measuring cup 5 is removed, the blockage 52 is inserted, and the mass m at this time is recorded 0 =150.825g; fix the measuring cup 5 on the measuring cup holder 3;

[0088] Step 4: The flow rate of the liquid supply...

Embodiment 2

[0096] The existing soaking and dissolving experimental methods (such as the method in "SZ36-1 Oilfield Polymer Injection Well / Production Well Plug Removal Technology Research") are used to compare with the method of the present invention. The process of the method of the present invention is as in Example 1.

[0097] The existing methods are as follows:

[0098] Step 1: Prepare a threaded bottle according to the experimental requirements, weigh a certain amount of polymer injection well and record it as w 1 ;

[0099] Step 2: prepare ammonium persulfate (APS) with a concentration of 1%, and mix the ammonium persulfate and the polymer injection well rebate in a mass ratio of 4:1;

[0100] Step 3: static reaction at 60°C for 24h;

[0101] Step 4: Test the quality of the polymer injection well after the reaction 2 ;

[0102] Step 5: Calculate the corrosion rate of the return material, and the calculation formula is β=(w 1 -w 2 ) / w 1 ×100%

[0103] Step 6: The experiment...

Embodiment 3

[0108] The multi-node blockage series continuous flushing plugging removal simulation experiment method is used to simulate the continuous plugging removal effect evaluation on site. The blockages at different nodes use the backflow materials of different flowback volumes from the injection well. The process is as follows:

[0109] Step 1: Determine the number of series units to be 3, connect the outlet of the liquid supply pump 10 of each node to the flushing nozzle 4; the outlet of the liquid collecting funnel 7 of the previous node is connected to the constant temperature tank 15 of the next node;

[0110] Step 2: The first constant temperature tank 15 is filled with a blocking agent; the blocking agent is selected to be 1% sodium percarbonate, and the temperature of the constant temperature tank 15 is set to be 60°C for the downhole blocking removal operation temperature;

[0111] Step 3: Each measuring cup 5 is fixed on the measuring cup fixing frame 3, and the control dev...

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Abstract

The invention discloses an open experimental device and method for simulating a single-segment blockage removal process, comprising a measuring cup for placing blockages, the bottom of the measuring cup is a screen mesh; a flushing nozzle is arranged at a corresponding position above the measuring cup; A liquid collecting funnel is arranged at the corresponding position; a constant temperature tank is placed at the corresponding position of the outlet below the liquid collecting funnel; the constant temperature tank is connected to the inlet port of the flushing nozzle through the liquid supply pump; it also includes a mass sensor for measuring the weight of the measuring cup and a A temperature sensor for measuring the temperature in the measuring cup; a temperature sensor, a mass sensor, a liquid supply pump and a constant temperature tank connection control device; the invention can quantitatively evaluate the change of the blockage removal rate over time, that is, it can simulate the reaction between the blocking agent and the blockage Dynamic change process; it can realize two plugging removal simulation experiment modes, which are closer to the actual situation on site.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an open experimental device and method for simulating a single-segment plugging removal process. Background technique [0002] With the continuous development of oilfields, more and more oilfields have entered the stage of medium and high water cut, and the production has decreased significantly. Therefore, many oilfields have adopted chemical flooding methods to improve oil recovery. Polymer flooding is the main means of enhancing oil recovery and has been widely used. However, with the wide application of polymer flooding, due to the viscoelasticity of the polymer and the presence of insoluble residues, it is adsorbed and retained in the near-wellbore zone, and the polymer solution encapsulates inorganic scale and oil pollution. This leads to blockage in the wellbore and near-wellbore area of ​​polymer injection / production wells, resulting in high injection pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/00G01N5/04G01D21/02
CPCG01N31/00G01N5/04G01D21/02
Inventor 冯茹森许成军王星光伍芸舒政
Owner SOUTHWEST PETROLEUM UNIV
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