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Experimental method for detecting reaction speed of carbonate rock and hydrochloric acid

An experimental method and a technology of reaction speed, applied in chemical method analysis, measurement device, color/spectral characteristic measurement, etc., can solve problems such as abnormal fluctuation, great influence on accuracy, and inability to find reaction speed, and achieve high accuracy and operation. handy effect

Inactive Publication Date: 2009-06-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The accuracy of the titration operation has a great influence on the accuracy of the obtained acid concentration, and the interval sampling operation is discontinuous, and the possible abnormal fluctuations in the reaction rate during the sampling interval cannot be found

Method used

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  • Experimental method for detecting reaction speed of carbonate rock and hydrochloric acid

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specific Embodiment approach

[0013] According to the experimental flow chart shown in accompanying drawing, the specific embodiment of the present invention is as follows:

[0014] Store the displacement fluid distilled water at normal temperature in the storage tank 1, and store the acid liquid in the lower part of the piston of the first intermediate container 3. After the displacement fluid is pumped out by the constant flow pump 2, the piston 4 in the first intermediate container 3 is driven, and then The acid solution on the other side of the piston leaves the first intermediate container 3, and after leaving the first intermediate container 3, the acid solution enters the preheating coil 5 in the water bath to be heated to the preset experimental temperature; the acid solution whose temperature has been raised enters the Shuangyan The plate simulates the fracture reactor 6 and reacts with the rock on the fracture wall.

[0015] The residual acid and reaction products discharged from the dual-rock sl...

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Abstract

The invention relates to an experimental method for determining reaction velocity of carbonate rock and hydrochloric acid in an acidification and fracturing laboratory and a research department. The method helps overcome discontinuity of periodic sampling of an acidification and fracturing experiment and test errors of titration method and enhance the test accuracy of acid and rock reaction velocity. The technical proposal is as follows: acid liquor is displaced from an intermediate container by a displacing fluid, preheated and sent to a double-rock plate type simulated crack reactor to react with rocks on a wall; the reaction product is cooled, filtered and sent to a gas-liquid separator, nitrogen gas is injected into the gas-liquid separator to separate carbon dioxide from the liquid, the mixed gas is discharged from the separator, and is subject to dehydrochlorination by distilled water, dehydration by phosphorus pentoxide and dehydration by concentrated sulfuric acid, and then an infrared gas analyzer is employed to determine the carbon dioxide content of the mixed gas, and the total flow rate, pressure and temperature of the mixed gas are also determined, and the reaction velocity is calculated by combing a state equation and a reaction formula The experimental method has the advantages of simple and convenient operation and higher accuracy, and can be used for determining the reaction velocity of the carbonate rock and the hydrochloric acid.

Description

technical field [0001] The invention relates to an experimental method for measuring the reaction speed of carbonate rock and hydrochloric acid in acidification fracturing laboratories and research laboratories. Background technique [0002] Acid fracturing is an important stimulation technology for carbonate reservoirs. Acid fracturing design is the basis of acid fracturing construction, and the reaction rate of acid rock is a necessary parameter for acid fracturing design. The existing experimental methods for determining the reaction rate of acid rocks can be classified into two categories: static methods and dynamic methods. [0003] The static experiment is to put a certain volume of rock in an autoclave filled with acid liquid, keep constant temperature, constant pressure and a certain surface-to-volume ratio, and make the acid rock react in the autoclave. The static test cannot reflect the real situation of the acid liquid flowing and reacting underground, and its e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N21/35
Inventor 杨兆中李小刚蒋海孙健
Owner SOUTHWEST PETROLEUM UNIV
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