CN103278690B - A kind of applying can monitor the device and method of axle pressure - Google Patents
A kind of applying can monitor the device and method of axle pressure Download PDFInfo
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- CN103278690B CN103278690B CN201310185796.8A CN201310185796A CN103278690B CN 103278690 B CN103278690 B CN 103278690B CN 201310185796 A CN201310185796 A CN 201310185796A CN 103278690 B CN103278690 B CN 103278690B
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Abstract
The invention discloses the device and method that a kind of applying can monitor axle pressure, in core resistivity measuring; Controllable axle pressure is applied to rock core end face to be measured, simultaneously by the pressure of pressure sensitive device Real-Time Monitoring rock core end face to be measured by force assembly.The present invention applies regulatable axle pressure by force assembly to the rock core to be measured being positioned at core holding unit in core resistivity measuring, and monitors real-time force value by pressure sensing devices.This method can in core resistivity measuring, regulatable axle pressure is applied to the rock core to be measured being positioned at core holding unit by force assembly, by applying stable axle pressure, the fluctuation that rock core to be measured because not having axle pressure to monitor to cause is stressed effectively can be eliminated; The axle pressure that can monitor can also guarantee the Stability Analysis of Structures of rock core to be measured, avoids excessive axle pressure to make rock core structure larger change occur and cause the change of rock core electrical conduction mechanism even cause breaking of rock core or damage.
Description
Technical field
The present invention relates to core resistivity measuring technical field, particularly in a kind of core resistivity measuring, apply the device and method can monitoring axle pressure.
Background technology
In petroleum geology exploration and logging technology field, rock resistivity parameter is used to divide water-oil interface and evaluate the oiliness of reservoir and the important indicator of oil-containing degree.
The resistance at what the experiment measuring of rock resistivity was measured usually is rock core two ends, and the mensuration of resistance needs by special rock core fixture and core holding unit, normally rock core is put into specific clamper, certain contact force (direction is vertical with rock core end face) is applied in two parallel end faces of rock core, namely the pressure between rock core end face and potential electrode on contact interface (now, the contact interface pressure be connected with axle pressure system just equals axle pressure), the axle pressure size applied determines the size of contact resistance, and then affect the resistance of measuring resistance, in addition, in the experiment measuring of rock resistivity, often for same rock core, need to carry out its resistance value of repetitious measurement, if do not have the monitoring of axle pressure, each applied axle pressure is random with uncertain, its contact resistance is caused also to be uncertain at random, this stochastic uncertainty directly affects resistivity measurements, is finally difficult to the evaluating reservoir level reaching expection, can not meets production actual needs.
Summary of the invention
Technical matters to be solved by this invention is to provide one when core resistance measurement, can apply the device and method of the axle pressure that can monitor.
The device that the applying that the present invention relates to can monitor axle pressure is a kind of core holding unit, comprising: force assembly, Π shape parts 10, pressure transducer 5, top electrode 6, bottom electrode 9 and core chamber 11;
Described pressure transducer 5 is fixed on the top, axle center of described top electrode 6;
Described Π shape parts 10 roof offers hole, and is connected with described force assembly by screw thread; Described force assembly end is relative with described top electrode 6 top;
The end of described Π shape parts 10 bottom clamping core chamber 11;
Described top electrode 6 is relative with described bottom electrode 9, and be placed in core chamber 11 inner chamber two ends;
Described core chamber 11 is for carrying rock core to be measured.
Further, described top electrode 6 and bottom electrode 9 are connected with host computer RLC electric bridge instrument the two poles of the earth respectively, for showing the real time resistance of rock core; The external upper Displaying Meter of pressure transducer 5, for showing the axle pressure of applying.
Further, described force assembly comprises: handle 1, large screw rod 2, small screw 3 and force base plate 4;
Described small screw 3 one end is embedded in described large screw rod 2 one end, and the other end of described small screw 3 is fixed on described force base plate 4; The other end and the described handle 1 of described large screw rod 2 are fixedly linked; Described force base plate 4 is relative with described top electrode 6; The hole that described large screw rod 2 is offered by screw thread and described Π shape parts 10 roof is connected.
Further, described Π shape parts 10 afterbody offers barb, described core chamber 11 end opens groove; Described barb is embedded in groove.
Further, conducting medium 7 is also comprised; Described conducting medium 7 is placed in top electrode 6 respectively and bottom electrode 9 contacts on end face with rock core 8 to be measured.
Further, described conducting medium 7 is conductive fabric or conducting resinl or aluminium foil or silver foil or chamois leather.
A kind of by above-mentioned core holding unit, apply the method can monitoring axle pressure: carry rock core to be measured by core holding unit, upper and lower electrode clamps rock core to be measured by the both ends of the surface of rock core to be measured; Regulatable axle pressure is applied to rock core end face to be measured, simultaneously by the axle pressure of pressure monitoring device Real-Time Monitoring rock core end face to be measured by force assembly.
Further, described force assembly for force fulcrum, by rotating large screw-pressing or loosening top electrode, thus applies regulatable axle pressure to rock core to be measured with Π shape parts.
Further, exert a force to exert a force in the assembly center of base plate overlaps with the geometric center of rock core end face to be measured.
Further, described pressure monitoring device is pressure transducer; The monitoring end face of described pressure transducer is the contact end face of rock core to be measured and top electrode.
Further, couplant is set at the upper and lower end face of described rock core to be measured, increases the contact area of upper and lower electrode and rock core end face.
The device and method of the axle pressure that applying provided by the invention can be monitored, clamper, the axle pressure applying to monitor by pressure transducer and force assembly changes the pressure on rock core end face and potential electrode surface of contact, when guaranteeing to measure on clamper, two surface of contact of lower two electrodes and rock core maintain certain axle pressure, close contact under making rock core end face and electrode can maintain certain pressure, effective uncertainty eliminated because not having axial compression monitoring to cause interface pressure, thus stable contact resistance, improve the stability measured, reduce the randomness and uncertainty brought because of suddenly big or suddenly small axle pressure, guarantee the stable of measurement result, reliably.The method of the axle pressure that applying can be monitored can keep the Stability Analysis of Structures of rock core, avoids excessive axle pressure to make rock core structure larger change occur and cause the change of rock core electrical conduction mechanism even cause breaking of rock core or damage.In addition, in repeatedly continuous coverage operation, can guarantee that one of axle pressure makes peace stable by monitor shaft to pressure, avoid different axle pressures cause the uncertainty of contact resistance and then have influence on measurement result.Therefore, the axle pressure applying to monitor is significant, and this device and method can promote the precision of core resistivity measuring to a certain extent.
Accompanying drawing explanation
The structural representation of the clamper that Fig. 1 provides for the embodiment of the present invention;
The force screw rod group structural representation that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the Π shape parts that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the core chamber that Fig. 4 provides for the embodiment of the present invention;
Wherein, 1-handle, the large screw rod of 2-, 3-small screw, 4-exerts a force base plate, 5-pressure transducer, 6-top electrode, 7-conducting medium, 8-rock core to be measured, 9-bottom electrode, 10-Π shape parts, 11-core chamber.
Embodiment
The one that the embodiment of the present invention provides, in core resistivity measuring, applies the device and method of the axle pressure that can monitor.
The device of the axle pressure that can monitor that what the embodiment of the present invention provided add is a kind of clamper, comprising: handle 1, large screw rod 2, small screw 3, force base plate 4, pressure transducer 5, top electrode 6, bottom electrode 9, Π shape parts 10 and core chamber 11; Pressure transducer 5 is fixed on the top, axle center of electrode 6; One end of small screw 3 is embedded in large screw rod 2 one end, and the other end of small screw 3 is fixed on force base plate 4, and the other end and the handle 1 of large screw rod 2 are fixedly linked; Force base plate 4 is relative with top electrode 6; Π shape parts 10 roof offers hole, is connected with large screw rod 2 by screw thread; Π shape parts 10 bottom clamping core chamber 11; Top electrode 6 is relative with bottom electrode 9, and be placed in core chamber 11 inner chamber two ends.
See Fig. 2, this device applies axle pressure by force screw rod group, comprising: handle 1, large screw rod 2, small screw 3 and force base plate 4; One end of small screw 3 is embedded in large screw rod 2 one end, and the other end is fixed on force base plate 4; Handle 1 and large screw rod 2 are fixedly linked.
In view of difference core sample size to be measured, quality there are differences, required forcing stroke is often different; Preferably, small screw 3 is connected with large screw rod 2 by screw thread, is embedded in large screw rod 2 end; According to different demand, rotate small screw 3 and forcing stroke can be made to finely tune within the specific limits, thus adapt to different measurement requirements.Screwed connection can make the connection of large small screw simple and reliable, convenient disassembly, makes the easy maintenance of clamper easy.
See Fig. 3, Fig. 4, Π shape parts 10 for connecting force screw rod group and core chamber 11, for force screw rod group provides the force strong point; Therefore, Π shape parts 10 clamp the end of core chamber 11, apply axle pressure by the force screw rod group be embedded in roof hole to the rock core in core chamber.
Large screw rod 2 is connected with Π shape parts 10 by screw thread, when applying axle pressure, by the rotation of large screw rod 2, making force screw rod group produce axial displacement, and then producing axle pressure.Because screwed connection makes the amplitude of variation of axial displacement steady, and then make the amplitude of variation of axle pressure also steady, thus the force precision of axle pressure is improved greatly; It also avoid the rock core to be measured that significantly axle pressure change causes on the other hand to damage.
In order to make Π shape parts 10 more firm with the connection of core chamber 11; Preferably, offer L-type barb at Π shape parts 10 afterbody, simultaneously the end opens annular recess of core chamber 11; L-type barb can be embedded in annular recess.
Core chamber 11, for carrying rock core to be measured, is tubular construction.Its inner chamber two ends settle top electrode 6 and bottom electrode 9 respectively, and during core resistance measurement, upper/lower electrode clamps rock core 8 to be measured.
In order to enable rock core 8 to be measured fully contact with upper/lower electrode, preferably, between upper/lower electrode and rock core to be measured 8, conducting medium 7 is set; According to the differing texture of rock core 8 to be measured, conducting medium 7 can be selected: conductive fabric or conducting resinl or aluminium foil or silver foil or chamois leather.Conducting medium 7 can fill to a certain extent the gap of rock core end face, hole from but the conduction loss of pressure reduce; Fill on the other hand fully top electrode 6, space between bottom electrode 9 and rock core to be measured 8, thus reduce contact resistance, optimize and measure.
At top, the axle center fixation pressure sensor 5 of top electrode 6, for monitoring the axle pressure that top electrode 6 bears; By external Displaying Meter observed and recorded axle pressure.Axle pressure is conducted to rock core 8 to be measured and bottom electrode 9 by top electrode 6; Therefore, the force value that pressure transducer 5 detects also has reflected the axle pressure that rock core 8 to be measured bears.
Before experiment, by rotating small screw 3, force base plate 4 and pressure transducer 5 is made to keep suitable distance; During experiment, rock core 8 to be measured is put into core chamber 11; Turning handle 1 slowly, large screw rod 2 slow circumvolve, drives small screw 3 and the axially-movable of force base plate 4, moves closer to pressure transducer 5; And then compress top electrode 6, when the force value that pressure transducer 5 is monitored reaches desired value, stop force operation.Now, axle pressure will remain at certain numerical value, the pressure remained constant on the surface of contact of upper/lower electrode and rock core to be measured 8, thus avoid because the influence of fluctuations measuring accuracy of interface pressure.
The embodiment of the present invention provide in core resistivity measuring, apply the clamper of axle pressure that can monitor and realize the monitoring of axle pressure, controllable by exert a force assembly and pressure transducer.Π shape parts are as force fulcrum, axle pressure is applied reposefully by screw thread, change the pressure between rock core end face and potential electrode on surface of contact lentamente, when guaranteeing to measure, two surface of contact of the upper and lower electrode of clamper and rock core maintain certain axle pressure, close contact under making rock core end face and electrode can maintain certain pressure, effective uncertainty eliminated because not having axle pressure to monitor the interface pressure caused, thus reduce contact resistance to a certain extent, and stable contact resistance; Improve the stability measured, reduce the randomness and uncertainty brought because of suddenly big or suddenly small axle pressure, guarantee the stable, reliable of measurement result.
The method applying to monitor axle pressure by above-mentioned clamper is: carry rock core to be measured by core holding unit, upper and lower electrode clamps rock core to be measured by the both ends of the surface of rock core to be measured; Regulatable axle pressure is applied to rock core end face to be measured, simultaneously by the axle pressure of pressure monitoring device Real-Time Monitoring rock core end face to be measured by force assembly.
Before core resistivity measuring, rock core is put into the core chamber of core holding unit, be placed between upper and lower electrode, both ends of the surface connect with upper and lower electrode respectively thus form loop with external measuring circuitry.
During measurement, apply regulatable axle pressure by force assembly to rock core end face to be measured; By rotating large screw-pressing or loosening top electrode, and then regulate the axle pressure of rock core end face to be measured; In the process by the size of the axle pressure of pressure monitoring device Real-Time Monitoring rock core end face to be measured, thus make the adjustment of axle pressure more accurate.
Apply axle pressure process in exert a force assembly with Π shape parts for force fulcrum, by rotating large screw-pressing or loosening top electrode, thus apply regulatable axle pressure to rock core to be measured.Π shape parts clamp core chamber and form with it an entirety, when large screw rod rotates force core chamber with force base plate close to each other or away from, thus the axle pressure be placed on the surface of contact of the top electrode in core chamber, rock core to be measured and bottom electrode is increased or reduces, thus reach the object applying regulatable axle pressure.
In order to optimize the action effect of axle pressure, the center of force base plate overlaps with the geometric center of rock core end face to be measured; Thus ensure the axle pressure that applies and the axle pressure that produces of rock core end face to be measured coaxial, thus ensure stressed even of rock core end face to be measured; Thus protection rock core structure is not damaged and ensures the accuracy that axle pressure is monitored.
The regulation and control of axle pressure can be completed by force assembly, but the axle pressure monitoring applied just needs pressure monitoring device.Pressure monitoring device is by directly monitoring the axle pressure of rock core end face to be measured thus instructing the applying of axle pressure to operate.Make applying axle pressure foundation to some extent on the one hand, in multi-pass operations, maintain the stable axle pressure environment that can survey on the other hand.
Embodiment below by a core resistivity measuring illustrates the practical application of this method.
1) rotary sidewall sampling is utilized to obtain 15 pieces of core samples;
2) to above-mentioned serial rock core, load in glass desicator to be measured together with equivalent local water after the process such as (diameter is 1 inch, and length is 3 centimetres-7 centimetres cylindric), washing oil, desalination, oven dry and saturated equivalent local water being processed to rock core according to SY/T5336-2006 " core analysis method " standard;
3) to step 1) described in serial rock core, carry out resistivity measurement and calculating according to " rock resistivity Experiment Parameter room methods of measurement and calculation (SY/T5385-2007) " normal process;
4) rock core measured material is the clamper that can apply to monitor axle pressure, is embedded the bottom of Π type parts in the ring groove outside the core chamber's topmost holding device folder, guarantees that this part centre is arranged on the axle center being positioned at core holding unit;
5) the resistivity measurement bottom electrode in core holding unit is taken out, then put into a standard bloom and carry out system zeroing, first probe power input and signal output lead are connected with digital display meter head, scale is carried out to sensor, do not apply axle pressure when implementing zeroing program, adjust full width then to apply full scale axle pressure;
6) the large screw rod of precession, when exert a force base plate and sensor stress contact close to time, slow operating grip guarantees the smooth transition of contact, avoids contact interface to cause rock core structure to change because of unexpected reinforcing, even may cause the breakage of rock core because reinforcing is too quickly; Observe the axle pressure indicated value of the digital display meter head of pressure transducer, continue the change of monitoring resistor while of slowly pressurization until resistance stabilization, maintain axle pressure now, the axle pressure direction of applying must perpendicular to force acting on transducer face;
7) scale and the effect of resistivity tester is then carried out.Gone between with resistivity tester by upper and lower for resistivity measurement electrode and be connected, guarantee the stable of power supply and test environment temperature, system zeroing scale is complete, then takes out bloom, carries out effect by measuring resistance, prepares the test of rock core;
8) taken out by the rock core of abundant saturated equivalent local water, first wipe out swimming of surface, the rock core weight that weighs with scale also records this weight;
9) rock core upper and lower end face is placed the conducting medium of saturated same formation water, and guarantee that conducting medium is adjacent to rock core end face, then load and apply controllable and monitor in the rock core resistivity measurement clamper of axle pressure;
10) after upper and lower two electrodes of clamper being connected with measuring bridge, the more slowly large screw rod of precession, pore texture depending on rock core applies corresponding axle pressure, loose core should apply slightly little axle pressure, densification is then corresponding larger, slow reinforcing must be carried out from small to large, and check the change of the digital display meter head monitoring axle pressure of pressure transducer, meanwhile, the change of resistance value is observed by the electric bridge instrument connecting rock core electrode, resistance value is from gradually diminishing greatly, when resistance value tend towards stability gradually no longer diminish start on the contrary slowly to go up time, (now rock core saturation degree is 100% to the lowest resistance value of record rock core, its resistance value is R0), and write down the axle pressure size of applying, in this, as the reference axle pressure that rock core resistance Rt under different water cut saturation degree measures,
11) desaturation method is adopted to carry out displacement to above-mentioned rock core, displacement forward sight rock core pore texture first adds certain confined pressure, apply the displacement pressure lower than this confined pressure 50psi again, the resistance driving rock core in journey because of water saturation reduction can great changes will take place, after this displacement pressure water saturation and rock core resistance tend towards stability, record this resistance value; Quick removal of core, with electronic balance weighing, and record;
12) rock core after weighing is reinstalled in core holding unit fast, the large screw rod of clockwise precession, apply the size of axle pressure with reference to the axle pressure value before taking-up, then according to step 11) carry out experimental implementation, strengthen confined pressure and displacement pressure gradually, generally choose 6 different water saturation measurement points, until the water saturation of rock core and resistance Rt value stabilization record, finally calculate corresponding resistivity and reservoir parameter according to Ohm law and Archie equation etc.
By in the measurement operation of rock core resistivity in the present embodiment, apply the axle pressure that can monitor, the fluctuation or the uncertainty that avoid axle pressure impact to measurements resistivity.Implement applying can monitor shaft to pressure operation time, the amplitude of variation of axle pressure should be determined according to the quality of rock core to be measured; Guarantee that the applying of axle pressure does not destroy the structure of rock core to be measured.The present embodiment adopts screwed connection as the mode of the connection of exert a force assembly and core holding unit to be measured, the amplitude of variation of axle pressure can be made to maintain a lower level, the amplitude resolution of axle pressure can be improved, the amplitude axially moved in the threaded hole of Π shape parts 10 due to the large screw rod 2 rotated is less relative to the amplitude directly axially moved, also more stable, for keeping the structure of rock core 8 to be measured, there is positive effect.
The device and method of the axle pressure that applying provided by the invention can be monitored, clamper changes the pressure on rock core end face and potential electrode surface of contact by the axle pressure that pressure transducer and force assembly apply to monitor, when guaranteeing to measure on clamper, two surface of contact of lower two electrodes and rock core maintain certain axle pressure, close contact under making rock core end face and electrode can maintain certain pressure, effective uncertainty eliminated because not having axial compression monitoring to cause interface pressure, thus stable contact resistance, improve the stability measured, reduce the randomness and uncertainty brought because of suddenly big or suddenly small axle pressure, guarantee the stable of measurement result, reliably.The axle pressure applying to monitor in core resistivity measuring applies constant axle pressure by force assembly to rock core to be measured, enables rock core to be measured and contacts electrode close contact; Avoid the impact of axle pressure on contact resistance of fluctuation.In addition, in repeatedly continuous coverage operation, can guarantee that one of axle pressure makes peace stable by monitor shaft to pressure, avoid different axle pressures cause the uncertainty of contact resistance and then have influence on measurement result.Therefore, the axle pressure applying to monitor is significant, and this device and method can promote the precision of core resistivity measuring to a certain extent.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a clamper, is characterized in that, comprising: force assembly, Π shape parts (10), pressure transducer (5), top electrode (6), bottom electrode (9) and core chamber (11);
Described pressure transducer (5) is fixed on the top, axle center of described top electrode (6);
Described Π shape parts (10) roof offers hole, and is connected with described force assembly by screw thread; Described force assembly end is relative with described top electrode (6) top;
The end of described Π shape parts (10) bottom clamping core chamber (11);
Described top electrode (6) is relative with described bottom electrode (9), the core chamber that is placed in (11) inner chamber two ends;
Described core chamber (11) is for carrying rock core to be measured;
Described force assembly comprises: handle (1), large screw rod (2), small screw (3) and force base plate (4);
Described small screw (3) one end is embedded in described large screw rod (2) one end, and the other end of described small screw (3) is fixed on described force base plate (4); The other end and the described handle (1) of described large screw rod (2) are fixedly linked; Described force base plate (4) is relative with described top electrode (6); The hole that described large screw rod (2) is offered by screw thread and described Π shape parts (10) roof is connected;
The monitoring end face of described pressure transducer is the contact end face of rock core to be measured and top electrode.
2. clamper as claimed in claim 1, is characterized in that: described top electrode (6) and bottom electrode (9) are connected with host computer RLC electric bridge instrument the two poles of the earth respectively, for showing the real time resistance of rock core; The external upper Displaying Meter of pressure transducer (5), for showing the axle pressure of applying.
3. clamper as claimed in claim 1, is characterized in that: described Π shape parts (10) afterbody offers barb, described core chamber (11) end opens groove; Described barb is embedded in groove.
4. clamper as claimed in claim 1, is characterized in that: also comprise conducting medium (7); Described conducting medium (7) is placed in top electrode (6) respectively and bottom electrode (9) contacts on end face with rock core to be measured (8).
5. clamper as claimed in claim 4, is characterized in that: described conducting medium (7) is conductive fabric or conducting resinl or aluminium foil or silver foil or chamois leather.
6., by a clamper according to claim 1, apply the method can monitoring axle pressure, it is characterized in that: carry rock core to be measured by core holding unit, upper and lower electrode clamps rock core to be measured by the both ends of the surface of rock core to be measured; Regulatable axle pressure is applied to rock core end face to be measured, simultaneously by the axle pressure of pressure monitoring device Real-Time Monitoring rock core end face to be measured by force assembly;
Described pressure monitoring device is pressure transducer; The monitoring end face of described pressure transducer is the contact end face of rock core to be measured and top electrode.
7. applying as claimed in claim 6 can monitor the method for axle pressure, it is characterized in that: described force assembly for force fulcrum, by rotating large screw-pressing or loosening top electrode, thus applies regulatable axle pressure to rock core to be measured with Π shape parts.
8. applying as claimed in claim 6 can monitor the method for axle pressure, it is characterized in that: the center of the base plate that exerts a force in force assembly overlaps with the geometric center of rock core end face to be measured.
9. applying as claimed in claim 6 can monitor the method for axle pressure, it is characterized in that: arrange conducting medium at the upper and lower end face of rock core to be measured, increases the contact area of electrode and rock core end face.
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| CN110927410A (en) * | 2018-09-20 | 2020-03-27 | 中国石油化工股份有限公司 | Core holder for core resistivity detection |
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| CN103278690A (en) | 2013-09-04 |
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