CN2913606Y - Water holding sensing device for measuring water retention rate - Google Patents
Water holding sensing device for measuring water retention rate Download PDFInfo
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- CN2913606Y CN2913606Y CN 200620086885 CN200620086885U CN2913606Y CN 2913606 Y CN2913606 Y CN 2913606Y CN 200620086885 CN200620086885 CN 200620086885 CN 200620086885 U CN200620086885 U CN 200620086885U CN 2913606 Y CN2913606 Y CN 2913606Y
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Abstract
The utility model relates to a capacitance-type transducer for measuring water holding capacity and used with logging devices in oil field. The capacitance-type transducer comprises an upper adapter, a lower adapter, and a metal housing and a metal probe both arranged between the upper and lower adapters. The metal probe has an insulating coating. A ring-shaped measurement space is defined between the metal housing and the metal probe. A fluid inlet and a fluid outlet are arranged respectively between the upper and lower adapters and the metal housing and are communicated with the ring-shaped measurement space. The utility model is characterized in that the fluid inlet and outlet are arranged radially at the upper and lower end parts of the metal housing, the axial length of the ring-shaped measurement space is increased by 3-20 times, and the aperture of the fluid inlet/outlet ranges from 5 mm to 15 mm. With the above arrangement, the utility model can keep the fluid inside the transducer to be in a state of relative rest and oil-water separation, thereby ensuring high accuracy and resolution.
Description
One, technical field: the utility model relates to a kind of and the supporting condenser type water holding sensor of oil reservoir logging instrument.
Two, background technology: the oil field uses the water holding instrument to log well for the water gaging that contains of crude oil in the down-hole casing of oil well, calculates the specific retention of each producing zone of oil well by the explanation of data.Water holding is the shared volume of water in the unit volume of working fluid, can be decimally or the percentage mode represent that it has represented the volume ratio of profit.During the water holding of logger in measuring sleeve pipe, a kind of instrument of measuring water holding uses capacitance type sensor, and instrument places the cover tube hub, and sensor internal flows into the oil-water mixture body, and the ratio of surveying its profit volume is a specific retention.Existing condenser type water holding sensor comprise upper and lower joint and between metal shell, metal probe form, constitute ring-like measurement space between metal shell, the metal probe, " the thin neck " of ring-like measurement space and last lower contact forms axially and connects, and forms measured fluid and downhole oil stream and flows synchronously.The design length of its ring-like measurement space (also claiming the probe effective length) has only 10cm usually simultaneously.This principle of sensors is: probe or probe (positive pole) and ground wire (shell, negative pole) constitute a capacitor, and the dielectric constant of material is directly proportional between the size of capacitance and both positive and negative polarity.When profit was the separation inactive state in space exploration, capacitance and oil-water ratio had linear functional relation.At this moment sensor has the certainty of measurement and the resolution ratio of higher oil-water ratio.If but the profit of sensor internal is not static separation, but flow freely, profit distribution instability in flowing, make the functional relation of capacitance and water holding become complicated more, at this moment sensor accuracy seriously reduces, incompatibility stripper well more, and error can reach more than 200% under the low runoff yield of 50 sides/below the sky, and resolution ratio is low, can only differentiate water holding greater than the variation more than 0.1 (10%).
Three, summary of the invention: the utility model is exactly the defective that exists at prior art, and the water holding sensor of a kind of high accuracy, high-resolution measurement oil well water capacity is provided.
Realize that the technical scheme that above-mentioned purpose is taked is: by changing the structure of water holding sensor, in the environment that the sensor external fluid flows, force the static relatively separation of the profit fluid-mixing that enters sensor internal, working sensor just can obtain higher certainty of measurement in stable environment.1, adds the large sensor effective length,, be increased to 30-200 centimetre by original 10-12 centimetre.2, change the size and shape of fluid inlet and outlet, former fluid inlet and outlet and fluid flow parallel change into vertical, quantity by up and down respectively 3 change respectively 1 into.
Concrete scheme is: comprise top connection, lower contact and the metal shell between last lower contact, metal probe, metal probe has insulating layer outward, constitute ring-like measurement space between metal shell and the metal probe, between metal shell and last lower contact, be respectively equipped with the fluid inlet and outlet that connects with ring-like measurement space, it is characterized in that: fluid inlet and outlet radially is opened in the upper and lower end parts of metal shell respectively, the axial length of ring-like measurement space improves 3-20 doubly than original length, and the fluid inlet and outlet bore is in 5-15 millimeter scope.
By the improvement of above-mentioned measure, just guaranteed that fluid enters the state that sensor internal presents static relatively and water-oil separating later on, also just guaranteed higher precision and resolution capability.
Four, description of drawings:
Accompanying drawing 1 is existing sensor construction figure;
Accompanying drawing 2 is structure charts of the utility model sensor.
Five, the specific embodiment:
Contrast accompanying drawing 1 and 2, two kinds of sensors of accompanying drawing all are made up of top connection 1, last fluid inlet and outlet 2, cable-through hole 3, metal probe (probe) 4, metal shell 5, insulating layer 6, ring-like measurement space (annular sampling room) 7, following fluid inlet and outlet 8, lower contact 9, metal shell negative line 10, metal probe electrode line 11.Difference is that the length of ring-like measurement space improves 30-200 centimetre from 10-12 centimetre, and fluid inlet and outlet is changed into vertical oil stream flow direction by original parallel oil stream flow direction, reduces the quantity and the bore of fluid inlet and outlet simultaneously.
Above-mentioned improvement is to obtain by a large amount of concrete experiments:
In 124 millimeters transparent pipelines of vertical internal diameter (simulated oil casing), press 1: 9 volume ratio of profit and inject fluid (moisture 10%), keep flow (300 side/sky) constant.The new sensor of 50 centimetres of effective lengths (transparent model) is put into the center of pipeline.Fluid enters sensor and from upper and lower opening turnover, after 10 seconds, turnover stops substantially, the static relatively and water-oil separating of the fluid of sensor internal, this flows outside and the static state in inside first kind of state.Outer fluid does not exchange in the sampling room, is that inside and outside pressure differential equates, and the condition that pressure differential equates to be inside and outside specific retention equate.Externally, oil-water ratio is 1: 9, and pressure differential equals 49 centimeter water columns.In inner water-oil separating, highly be that 45 cm of water add 5 centimetres of oil, pressure differential also is 49 centimeter water columns.
Establish an equation by mathematical thinking
X centimeter water column+y centimetre oil column=50 centimetres (highly equal) (1)
X centimeter water column+0.8y centimetre oil column=49 centimeter water columns (pressure reduction equates) (2)
The unique solution of equation (1) (2) is that 45 centimeter water columns add 5 centimetres of oils column, and when promptly sensor inside and outside fluid did not exchange, inner oil-water ratio (water holding) necessarily equaled outside oil-water ratio.The capacitance of measuring transducer just can obtain stable oil-water ratio numerical value like this, promptly high-precision water holding measurement result.
Second kind of state that outer fluid replaces in the sensor is transition state.Reduce the water holding of sensor external fluid, for example change oil-water ratio 2: 8, at this moment the sensor external pressure differential became for 48 (40 centimetres of centimeter water columns add 10 centimetres of oils column) by 49 centimeter water columns.Sensor internal 49 centimeter water columns, inner pressure than outside high 1 centimeter water column.At this moment water flows out from bottom ports fast, suck the water that has oil droplet from upper port, oil float is on top, oil mass increases in the sensor internal liquid, and the water yield reduces, and also is 2: 8 o'clock up to the internal liquid oil-water ratio, pressure equals 48 centimeter water columns, the inside and outside exchange of sensor stop liquid, inner fluid is static relatively and realize water-oil separating naturally, gets back to first kind of state.
The third state that outer fluid replaces in the sensor also is a transition state.Sensor internal pressure is less than external pressure, and liquid passes in and out along the direction with second kind of opposite states, also reaches first kind of state.
The mobile transition required time of second and third kind is relevant with inside and outside water holding difference size, and the water holding to 10% changes, and generally finishes within 30 seconds.Can change the oil-water ratio and the flow velocity of liquid arbitrarily, sensor always can be realized inner stable, is stable time difference slightly, measures after the data of enrolling sensor in use then need be waited for liquid stabilising, continuous measurement is also enrolled average, can obtain accurate data.
If the 4th kind of state, promptly liquid is ceaselessly gone into from following orifice flow, and last orifice flow goes out, sensor can not obtain stable data, direction, length or size that the liquid manhole appendix is described are improper, as long as length, direction, hole size are suitable, just can avoid occurring this situation.
Strengthen sensor length to improving the principle analysis of performance: the import and export distance of lengthening sensor, can increase the unbalanced pressure reduction of the inside and outside liquid of sensor, help the exchange of inside and outside liquid, thereby improve resolution ratio, improve certainty of measurement.With the experiment sensor is that example is calculated, and water holding is 90% liquid, and when the effective length of sensor was 10 centimetres, inside and outside fluid column pressure reduction all was 9.8 centimeter water columns.At this moment outside water holding is reduced to 80% liquid, external pressure differential is reduced to 9.6 centimeter water columns, and inside and outside differential pressure 0.2 centimeter water column is because the viscosity influence of liquid, sensor inside and outside liquid does not flow under the pressure reduction of this 0.2 centimeter water column, promptly can not differentiate 10% water holding variation.The sensor measurement error is 10% at least.And sensor is lengthened to 50 centimetres, under the same terms, the inside and outside pressure reduction of calculating sensor becomes greatly 1 centimeter water column, and length increases 5 times, pressure reduction also increases by 500, it is liquid alternated to suppose that sensor all just begins under 0.2 centimeter water column, and for short sensor, water holding resolution ratio is that 10% minimal error also is 10%, long pass sensor for 50 centimetres, 0.2 the pressure reduction of centimeter water column, can calculate corresponding is that 2% water holding changes, and the resolution ratio of long pass sensor is that 2% minimal error also is 2%.
Utilize the computational methods of outer fluid difference in the sensor.Can obtain, sensor length increases N doubly, and its resolution capability just improves N doubly, and error narrows down to 1/N.Be that sensor is long more, precision is high more, but oversize meeting makes instrument become heavy.Experiment shows that sensor physical length effect in 0.3-1.5 rice scope is best.
For check the design's actual effect, made the kinds of experiments model, in model well, to test, measurement result sees Table lattice.
| The sensor classification | Original sensor | New sensor | New sensor | New sensor |
| Sensor characteristics | Effective long 10cm | Effective long 50cm | Effective long 100cm | Effective long 150cm |
| 200 sides/sky flow, 90% contains under water, 4 measurement result averages (water %) | 80.3 | 89.55 | 89.8 | 89.9 |
| Measure error % | -9.7％ | -0.5％ | -0.2％ | -0.1％ |
| 200 sides/sky flow, 80% contains under water, 4 measurement result averages (water %) | 76.6 | 79.4 | 80 | 80.1 |
| Measure error % | -3.4％ | -0.6％ | 0 | 0.1％ |
| Remarks: sensor internal profit state | The not energy measurement that flows is arranged 3 times | Separating stable | Separating stable | Separating stable |
To 500 side/skies, moisture 100% to 0%, organize by combined situation more than 400 from 30 side/skies for the experiment flow, more than only provided few part experimental data, can illustrate that the new biography sensor can guarantee that the liquid of space exploration inside is static relatively, is the water-oil separating state.The resolution ratio of sensor brings up to 1% by original 10%, and error reduces more than 10%.
Claims (2)
1, a kind of water holding sensor of measuring oil well water capacity, comprise top connection, lower contact and the metal shell between last lower contact, metal probe, metal probe has insulating layer outward, constitute ring-like measurement space between metal shell and the metal probe, be respectively equipped with the fluid inlet and outlet that connects with ring-like measurement space between metal shell and last lower contact, it is characterized in that: fluid inlet and outlet radially is opened in the upper and lower end parts of metal shell respectively.
2, the water holding sensor of measurement oil well water capacity according to claim 1 is characterized in that: the axial length of ring-like measurement space improves 3-20 doubly than original length, and the fluid inlet and outlet bore is in 5-15 millimeter scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620086885 CN2913606Y (en) | 2006-07-12 | 2006-07-12 | Water holding sensing device for measuring water retention rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620086885 CN2913606Y (en) | 2006-07-12 | 2006-07-12 | Water holding sensing device for measuring water retention rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2913606Y true CN2913606Y (en) | 2007-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620086885 Expired - Fee Related CN2913606Y (en) | 2006-07-12 | 2006-07-12 | Water holding sensing device for measuring water retention rate |
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| CN (1) | CN2913606Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949720A (en) * | 2010-07-30 | 2011-01-19 | 西安交通大学 | Device and method for measuring split-phase type two-phase flow holdup rate |
| CN103174408A (en) * | 2011-12-24 | 2013-06-26 | 中国石油化工股份有限公司 | Inflatable capacitance type water cut and flow compound sensor |
-
2006
- 2006-07-12 CN CN 200620086885 patent/CN2913606Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949720A (en) * | 2010-07-30 | 2011-01-19 | 西安交通大学 | Device and method for measuring split-phase type two-phase flow holdup rate |
| CN101949720B (en) * | 2010-07-30 | 2012-05-09 | 西安交通大学 | Device and method for measuring split-phase type two-phase flow holdup rate |
| CN103174408A (en) * | 2011-12-24 | 2013-06-26 | 中国石油化工股份有限公司 | Inflatable capacitance type water cut and flow compound sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070620 Termination date: 20140712 |
|
| EXPY | Termination of patent right or utility model |