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Method for detecting concentration of soft movable gel microsphere of deep oil displacement and profile control agent

A technology of gel microspheres and detection methods, which can be used in measurement devices, suspension and porous material analysis, particle suspension analysis, etc., and can solve problems such as inability to accurately measure SMG concentration.

Active Publication Date: 2012-05-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SMG is a kind of polyacrylamide polymer W / O emulsion microspheres. It is determined by the conventional starch-cadmium iodide method, which will be seriously affected by oil content in oilfield water, inorganic ions and the color of the produced fluid itself, so it cannot be accurately measured. Measuring the concentration of SMG in production fluid

Method used

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  • Method for detecting concentration of soft movable gel microsphere of deep oil displacement and profile control agent
  • Method for detecting concentration of soft movable gel microsphere of deep oil displacement and profile control agent
  • Method for detecting concentration of soft movable gel microsphere of deep oil displacement and profile control agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1. Flexible Movable Gel Microsphere (SMG) Standard Curve Drawing

[0025] (1) Prepare flexible movable gel microspheres (SMG) with on-site injection water into six standard solutions with mass concentrations of 50mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L, and 500mg / L ;

[0026] (2) Pipette 5ml of the above-mentioned 6 standard samples respectively, and place them in a digestion bottle;

[0027] (3) Add 6g of accelerator and 8ml of concentrated sulfuric acid to the digestion flask respectively, place the digestion flask on the digestion furnace, and digest at 420°C for 2 hours;

[0028] (4) After the digestion is completed, remove the digestion bottle and cool to room temperature;

[0029] (5) Use KDN-2008 automatic azotometer to distill out inorganic ammonia by adding 100-200 mL of mass concentration 40% sodium hydroxide respectively, and absorb the ammonia produced by 50-100 mL of boric acid solution with a mass concentration of 2%;

[0030] (6) Add 3 drop...

Embodiment 2

[0034] Example 2. By nitrogen determination, the millimoles of the standard solution consuming standard hydrochloric acid were recorded, and the results in Table 2 were obtained by the linear regression equation y=41568x-386.78.

[0035] Table 2. Measured data of SMG concentration in oilfield produced fluid

[0036]

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Abstract

The invention relates to a method for detecting a concentration of a soft movable gel microsphere (SMG) of a deep oil displacement and profile control agent. The method comprises the steps of: preparing the SMG microsphere to have 4-8 standard concentrations by using in-place injection water, transferring 5ml of standard solution, adding 5-10g of digestion accelerator and 6-30mL of concentrated sulfuric acid, digesting at a digestion temperature of 400-500 DEG C for 1-2h; after the digestion is completed, cooling to reach room temperature, adding 40 percent sodium hydroxide, distilling to obtain inorganic ammonia, absorbing generated ammonia by using a 2 percent boric acid solution, using a methyl red-bromocresol green mixed indicator as an indicator, titrating an absorption solution by using standard hydrochloric acid to obtain a mmol number of consumed hydrochloric acid; and drawing a horizontal coordinate as the mmol number of the consumed hydrochloric acid and a vertical coordinate as an SMG concentration curve of the SMG concentration to obtain a linear regression equation, and figuring out the content of the SMG in an extraction solution by using the linear regression equation. The method can be used for accurately measuring the concentration of the SMG in the extraction solution.

Description

technical field [0001] The invention relates to a method for detecting the concentration of SMG in the production fluid of flexible movable gel microspheres (SMG) of oilfield deep control and displacement agent. Background technique [0002] Flexible movable gel microspheres are a new type of chemical agent for deep water control and displacement. It has a good control and displacement effect on oilfields where the main reservoir is severely flooded and the distribution of remaining oil is highly dispersed. Directly adjust the flooding unevenness to improve the sweep coefficient. [0003] However, with the injection of SMG, in order to understand the injection effect, it is necessary to study the concentration of SMG in the produced fluid. SMG is a kind of polyacrylamide polymer W / O emulsion microspheres. It is determined by the conventional starch-cadmium iodide method, which will be seriously affected by oil content in oilfield water, inorganic ions and the color of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
Inventor 马自俊陈建斌赵振兴王临红
Owner PETROCHINA CO LTD
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