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.
CN102466610AActive Publication Date: 2012-05-23PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2012-05-23

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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.
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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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