Method and device for controlling flow velocity of high-pressure fluid
A high-pressure fluid and flow rate technology, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of inability to manufacture capillaries, slow pressure relief, high price, etc., and achieve easy processing, cost saving, and short processing time. Effect
Inactive Publication Date: 2012-05-16
贵州航天凯山石油仪器有限公司
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Problems solved by technology
The high-pressure fluid realizes slow pressure relief without the participation of the control system. The common method is to use ultra-fine capillary tubes (capillary inner diameters less than 0.1mm) for pressure relief. Very fine capillaries are expensive
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[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.
[0014] Example.
[0015] A method of controlling the flow rate of high-pressure fluids, such as figure 1 As shown, the method is to connect a set of precision thread pairs between the fluid high-pressure chamber and the low-pressure chamber, and the fluid in the high-pressure chamber flows into the low-pressure chamber through the gap between the thread teeth of the precision thread pair; by adjusting the effective length of the thread fit, the thread Cooperate with precision and thread diameter specifications to achieve the purpose of controlling the flow rate of high-pressure fluid. The accuracy grade of the precision thread pair is not less than grade 6. The diameter specification of precision thread pair is smaller than M30-6H. The effective length of thread fit is not less than 300mm.
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The invention discloses a method and a device for controlling the flow velocity of a high-pressure fluid. The method comprises the following steps of: connecting a set of precise thread pair between a high-pressure cavity and a low-pressure cavity of the fluid; allowing the fluid in the high-pressure cavity to flow into the low-pressure cavity through gaps among threaded teeth of the precise thread pair; and adjusting effective fit lengths, fit accuracy and diameter specifications of threads to fulfill the aim of controlling the flow velocity of the high-pressure fluid. The method and the device are realized by replacing an ultra-thin capillary tube with the inner diameter of less than 0.1mm through the set of thread pair, so that the capillary tube can be replaced by micro gaps generated by processing and matching precise threads, slow decompression of the high-pressure fluid is realized under the control of a control-free system, and the condition that gas and liquid samples are not changed at all in the sampling process is ensured. By the method and the device, samples acquired from a deep oil gas field under a high-temperature high-pressure environment are more approximate to the original phase state; and the method and the device have a great significance for geological analysis.
Description
technical field [0001] The invention relates to a method and device for controlling the flow rate of high-pressure fluid, and belongs to the technical field of slow pressure release of high-pressure fluid. Background technique [0002] In the western Sichuan oil and gas field, it is necessary to take samples at a well depth of about 3,000 meters. In order to preserve the phase state of the sample, the sample must enter the sampler extremely slowly during sampling. At this time, a certain volume of substitute fluid must be filled first. Through the replacement principle Sampling, that is, the sample squeezes the substitute liquid under high pressure, and the substitute liquid is exhausted extremely slowly through the capillary or fine thread fit gap, so as to ensure that the phase state of the sample will not change during the entire sampling process. The high-pressure fluid realizes slow pressure relief without the participation of the control system. The common method is to...
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IPC IPC(8): E21B49/08
Inventor 田赁周文强马巧红王文青
Owner 贵州航天凯山石油仪器有限公司