CN1109586A - Continously automatic measuring method of oil/water split-phase micro flow - Google Patents
Continously automatic measuring method of oil/water split-phase micro flow Download PDFInfo
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- CN1109586A CN1109586A CN 94102957 CN94102957A CN1109586A CN 1109586 A CN1109586 A CN 1109586A CN 94102957 CN94102957 CN 94102957 CN 94102957 A CN94102957 A CN 94102957A CN 1109586 A CN1109586 A CN 1109586A
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Abstract
The present invention relates to a method for continuously automtically measuring oil-water phase splitting flow at the time of micro flow of oil-water mixture. Said method uses a special-made connector, and uses the continuous measurement of voltage variation of the resistor fixed on the loop so as to obtain its oil-water flow ratio, and then combines it with the fluid weight flow measured by elecronic balance, and then according to the densities of oil and water it can calculate the oil and water phase-split flows. Said invention is high in automation degree, accurate in measurement and large in data capacity, so that it is applicable to automatic continuous measurement of various relative permeabilities (stable state, unsteady state, two-phase and three phase) and core flow tests.
Description
The continuous automatic measurement method of profit separate phase flow rate when the present invention relates to the micro-profit mixed flow in the rock core relative permeability test in petroleum geology exploration field.
The continuous automatic measurement problem of profit separate phase flow rate in the test of rock core relative permeability, does not mostly adopt graduated cylinder and stopwatch to measure and calculate the profit separate phase flow rate when all solving at present both at home and abroad micro-profit mixed flow.Use the shortcoming of the manual measurement method of this original backwardness to be: error is big, precision is low, time-consuming.And the experimenter bears heavily.The automatic technological difficulties of measuring of micro oil moisture phase flow rate are also not find a kind of method that can carry out mobile ow ratio in the automatic measuring tube of on-line continuous at present.
For overcoming above-mentioned measuring method deficiency, the invention provides a kind of method of profit phase-splitting micrometeor continuous automatic measurement and the special measurement joint and the manufacture method thereof of this method of enforcement.
The present invention adopts by fixed frequency and measures resistance, the electric current that flows through branch phase fluid in the measurement joint micropore in a period of time, or calculate the ow ratio of flow media by the variation of its magnitude of voltage that on the fixed resistance of loop, is produced, calculate micro oil moisture phase flow rate by oil-gas ratio.For realizing that this method has designed the special measurement joint of measuring tube inner fluid resistance.Measuring joint is made up of the hole pipe that intersects, is interconnected, there is screw thread at the two ends of longitudinal tubule (L tubule), a filament is arranged on the central axis of cross-drilled hole, fill with epoxy resin in two eyelets, axis along vertical hole has a center micropore in the epoxy resin body, filament in the cross-drilled hole is cut off by micropore, leaves metal fracture on hole wall.The manufacture method of measuring joint is along measuring the through hole that the joint longitudinal axis bores the about 6～8mm of a diameter, in the middle part of measuring joint, bore the transverse holes that a diameter is 6mm and vertical core quadrature again, fine wire with a diameter 0.5mm passes cross-drilled hole again, tinsel should intersect vertically along the cross-drilled hole axis and with vertical axially bored line, and makes it the location.Epoxy resin is injected in two holes, tinsel is fixed and is filled up whole eyelets space, treat that epoxy resin fully solidifies back drill bit with diameter 2mm and drills along the vertical core axis, make the tinsel that crosses eyelet drilled disconnected, make it on hole wall, leave fracture as potential electrode.
Description of drawings of the present invention is as follows:
Fig. 1 is the structural representation of measurement joint of the present invention.
Fig. 2 is a measuring method principle schematic of the present invention.
Describe principle of work of the present invention and specific implementation method in detail below in conjunction with accompanying drawing:
When profit in pipe during mixed flow, its profit phase-splitting volume flow Q o and Qw and total mass flow rate Qm have following relation:
Qm＝QoPo+QwPw
In the formula: Po, Pw are respectively the density of oil, water.Ow ratio Row is defined as the flow Qo of oil and the ratio of the flow Qw of water, promptly
Row＝Qo/Qw
Just can obtain asking the expression formula of oil, moisture phase flow rate by two formula simultaneous solutions:
Qo＝Qm/（Po+Pw/Row）
Qw＝Qm/（PoRow+Pw）
The scales/electronic balance weighing method is adopted in the measurement of mass rate Qm, and the measurement of ow ratio Row is the special measurement joint 6 by the present invention's design.And will measure that joint 6 is connected in the closed-loop path and realize.There is the screw thread 1 that is connected with measurement line at the two ends of measuring joint 6, along measuring the through hole that joint 6 longitudinal axis bore the about 6～8mm of a diameter, bore the transverse holes that a diameter is 6mm and vertical core quadrature again at measurement joint 6 middle parts, fine wire 2 with a diameter 0.5mm passes cross-drilled hole again, tinsel 2 should intersect vertically along the cross-drilled hole axis and with vertical axially bored line, and makes it the location.Epoxy resin 3 is injected in two holes, whole eyelets space is fixed and filled up to tinsel 2.Treat that epoxy resin 3 fully solidifies back drill bit with diameter 2mm and drills along the vertical core axis, make the tinsel 2 that crosses eyelet drilled disconnected, make it on hole wall, leave fracture as potential electrode 4.It is smooth that the center hole wall will keep, and preferably adopts laser drill.Measure block battery 7 and suitable resistance of one 9 volts of two ends series connection of the potential electrode 4 of joint 6, make it and measure closed-loop path of fluid formation in the joint 6.When the character of measuring joint 6 tube fluids changed, its resistance also changed, and the fluid of measuring in the joint 6 is equivalent to a variable resistor.In the constant series loop of supply voltage, changes in resistance will cause the change of electric current in the circuit, and also correspondingly change in the voltage drop at fixed resistance 5 two ends, as long as just the voltage of measuring fixed resistance 5 two ends passes through in the joint 6 as can be known is oil or water.When oil passed through joint 6, it is infinitely great that the resistance of oil can be considered, and do not have electric current in the loop this moment, and the voltage at fixed resistance 5 two ends is approximately zero; When flowing through water in the joint 6, the resistance of water changes according to its salt content, generally does relative permeability and is to use salt solution, its resistivity generally all is very low, can be approximately zero, at this moment the voltage at fixed resistance 5 two ends is near cell voltage, in measuring process, the voltage at fixed resistance 5 two ends changes on 0 volt and 9 volts of two values, we can handle these two magnitudes of voltage as logical variable, establish 0 volt of magnitude of voltage for false, and 9 volts of magnitudes of voltage are true, falsity is represented oil, and true value is represented water.The influence of the loss of cell voltage and some other factor when considering actual measurement, magnitude of voltage just are not 0 volt and 9 volts, and evidence is got 2 volts of following magnitudes of voltage for false, and 2 volts of above magnitudes of voltage are true.Computing machine is gathered this voltage data with a fixing frequency, and in the regular hour sheet, the falsity that obtains and the quantitative proportion of true value are exactly the average ow ratio in during this period of time.Calculating the time interval of average ow ratio can choose artificially.The time interval is long, and measurement point is many, the ow ratio statistical precision height that calculates, but getable ow ratio data are few; Otherwise measurement point is few, and the statistical precision of ow ratio is poor, and the ow ratio data of acquisition are many.So should determine the time interval according to actual needs.In the test of astable method relative permeability, can also adopt the change interval method, short at interval when promptly beginning to test, increase the time interval gradually to testing the later stage, to satisfy Testing requirement.The precision of measuring is except relevant with measurement joint itself, sample rate also is a key factor, sample rate depends on the arithmetic speed of computing machine, the performance of A/D plate and the structure of sampling routine, through evidence, sample rate can satisfy the requirement of measuring accuracy for about 100 times at per second.
The present invention becomes a reality the continuous automatic measurement of micrometeor, and this can alleviate experimenter's burden.Help to increase work efficiency, the personal error that reduces in measuring improves measuring accuracy, can obtain more measurement data, helps the standardization of measuring process and method.Automaticity height of the present invention is measured accurately, and data capacity is big, is applicable to the automatic continuous coverage of various relative permeabilities (stable state, unstable state, two-phase, three-phase) and core flow test.
Claims (7)
1, a kind of measurement joint of profit phase-splitting micrometeor continuous automatic measurement, it is characterized in that: it is made up of the hole pipe that intersects, is interconnected, there is screw thread (1) at the two ends of longitudinal tubule (L tubule), a filament (2) is arranged on the central axis of cross-drilled hole, fill with epoxy resin (3) in two eyelets, axis along vertical hole has a center micropore (4) in the epoxy resin body, the filament (2) in the cross-drilled hole is cut off by micropore (4), leaves metal fracture on hole wall.
2, measurement joint according to claim 1, it is characterized in that: the aperture in vertical hole is 6～8 millimeters, and the aperture of cross-drilled hole is 6 millimeters, and filament is 0.5 millimeter, micropore (4) in the epoxy resin (3) is 1～3 millimeter, and described vertical hole and cross-drilled hole are mutually orthogonal.
3, the manufacture method of the described measurement joint of a kind of claim 1, it is characterized in that: along measuring the through hole that the joint longitudinal axis bores the about 6～8mm of a diameter, in the middle part of measuring joint, bore the transverse holes that a diameter is 6mm and vertical core quadrature again, use the fine wire (2) of a diameter 0.5mm to pass cross-drilled hole again, tinsel (2) should intersect vertically along the cross-drilled hole axis and with vertical axially bored line, and make it to locate, epoxy resin (3) is injected in two holes, whole eyelets space is fixed and filled up to tinsel (2), treat that epoxy resin (3) fully solidifies back drill bit with diameter 2mm and drills along the vertical core axis, make the tinsel (2) that crosses eyelet drilled disconnected, make it leave fracture as potential electrode (4) on hole wall, it is smooth that the center hole wall will keep.
4, a kind of continously automatic measuring method of oil/water split-phase micro flow, it is characterized in that: measure to flow through in a period of time by fixed frequency and measure resistance, the electric current that divides phase fluid in the joint micropore (4), or by its magnitude of voltage that on loop fixed resistance (5), is produced, determine the character of fluid according to each measured value, the content of the frequency computation part different fluid that occurs according to different fluid is than (Row), thereby calculates the flow (Qo, Qw) of each phase fluid.
5, measuring method according to claim 4, it is characterized in that: constitute series loop by Voltaic battery (7), fixed resistance (5) and measurement joint (6), the magnitude of voltage of fixed resistance during measurement (5) is during greater than 2 volts, the fetch logic value is true, when it is worth less than 2 volts, the fetch logic value is false, and true value is represented water, and falsity is represented oil.
6, measuring method according to claim 4 is characterized in that: described fixed frequency is a per second more than 40 times, preferably adopts per second 100 times, adopts electronic balance to measure mass rate (Qm).
7, according to claim 4 or 5 described measuring methods, it is characterized in that: adopt computing machine to read and write down the magnitude of voltage of fixed resistance (5) automatically, and export the flow of each phase fluid according to the numerical evaluation that is write down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94102957 CN1109586A (en) | 1994-03-28 | 1994-03-28 | Continously automatic measuring method of oil/water split-phase micro flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94102957 CN1109586A (en) | 1994-03-28 | 1994-03-28 | Continously automatic measuring method of oil/water split-phase micro flow |
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| Publication Number | Publication Date |
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| CN1109586A true CN1109586A (en) | 1995-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 94102957 Pending CN1109586A (en) | 1994-03-28 | 1994-03-28 | Continously automatic measuring method of oil/water split-phase micro flow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529215B (en) * | 2006-10-27 | 2011-09-07 | 株式会社奥巴尔 | Multi-phase flowmeter |
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1994
- 1994-03-28 CN CN 94102957 patent/CN1109586A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529215B (en) * | 2006-10-27 | 2011-09-07 | 株式会社奥巴尔 | Multi-phase flowmeter |
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