Piston flow detection method and device for injection of carbon dioxide to oilfield
A flow detection device, carbon dioxide technology, applied in the direction of measurement, mining fluid, earth drilling, etc.
Active Publication Date: 2015-04-01
贵州航天凯山石油仪器有限公司
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Problems solved by technology
[0003] The purpose of the present invention is to provide a piston flow detection method and device for injecting carbon dioxide in an oil field to solve the problem of testing the injection volume of downhole layers and provide a technical basis for the realization of layered measurement and adjustment of carbon dioxide injection wells, thereby overcoming the limitations of the prior art. insufficient
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[0021] This example
[0022] A downhole flowmeter is formed by connecting a piston flowmeter in series with a collecting umbrella. The piston is installed in a tapered hole with a small upper part and a larger lower part, and a compression spring is installed under the piston. The medium flow rate is different, and the distance that the piston moves is different. The flow-collecting umbrella can be opened or folded as required. When it is necessary to test the flow rate, first let the collecting umbrella open to seal with the inner wall of the oil pipe, and then measure the apparent flow rate at the current position by testing the position of the piston. After measuring the apparent flow at the top and bottom of the same gas distributor, the actual gas injection volume of the layer to be measured can be obtained by subtracting the apparent flow at the bottom from the apparent flow at the top. In the present invention, two groups of flow collecting umbrellas and waist wh...
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The invention discloses a piston flow detection method and device for injection of carbon dioxide to oilfield (b). A detection instrument used by the piston flow detection method and device for injection of carbon dioxide to oilfield (b) is provided with an air inlet and an air outlet. The instrument top circle between the air inlet and air outlet is provided with a confluent-liquid umbrella. A piston flow meter is installed inside the instrument between the air inlet and air outlet. When detecting flow, the air passage outside an oil pipe is closed via the confluent-liquid umbrella, the air only can pass through the air inlet above the confluent-liquid umbrella and be discharged from the air outlet under the confluent-liquid umbrella after going through the piston flow meter, and the apparent flux at the present position is measured according the shifting distance of the piston flow meter. The piston flow detection method and device for injection of carbon dioxide to oilfield resolves the test problem of layering injection of carbon dioxide at critical status by the coordinate of the confluent-liquid umbrella and the piston flow meter, and provides technological base to the realization of carbon dioxide wells layered measurement.( / b).
Description
technical field [0001] The invention relates to a piston-type flow detection method and device for injecting carbon dioxide into an oil field, and belongs to the technical field of oil field well testing instruments. Background technique [0002] In the process of oil recovery in the oil field, the effect of significantly increasing oil can be achieved by injecting carbon dioxide into the oil well. Therefore, at present, various oilfields attach great importance to the research of carbon dioxide injection technology. Due to differences between oil layers, long-term co-injection of carbon dioxide can easily form single-layer gas channeling, reduce oil displacement efficiency, and lead to a decline in crude oil production. Hence the need for layered injection control. The prerequisite for control is the injection volume test. At present, the layered injection volume can only be tested by the isotope method, which has high cost, low precision, and potential safety hazards. ...
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IPC IPC(8): E21B47/00E21B43/16
CPCE21B43/164E21B47/00
Inventor 庞云伟
Owner 贵州航天凯山石油仪器有限公司