CN103278690A - Device and method for applying monitorable axial pressure - Google Patents
Device and method for applying monitorable axial pressure Download PDFInfo
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- CN103278690A CN103278690A CN2013101857968A CN201310185796A CN103278690A CN 103278690 A CN103278690 A CN 103278690A CN 2013101857968 A CN2013101857968 A CN 2013101857968A CN 201310185796 A CN201310185796 A CN 201310185796A CN 103278690 A CN103278690 A CN 103278690A
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Abstract
The invention discloses a device and method for applying a monitorable axial pressure, which are used in the resistivity measurement of a rock core. A force-applying assembly is used for applying controllable axial pressure on the end face of the rock core to be measured, and meanwhile the pressure of the end face of the rock core to be measured is monitored by a pressure induction device in real time. In According to the invention, the controllable axial pressure is applied to the rock core to be measured positioned in a rock core holding unit by the force-applying assembly in the resistivity measurement of the rock core, and the real-time pressure value is monitored by the pressure induction device. The method can apply controllable axial pressure to the rock core to be measured positioned in the rock core holding unit by the force-applying assembly in the resistivity measurement of the rock core and is capable of effectively eliminating the fluctuation of the stress of the rock core to be measured due to the lack of the axial pressure monitoring by applying stable axial pressure; and due to the controllable axial pressure, the stable structure of the rock core to be measured can be ensured, and the change of the electric conduction mechanism of the rock core, even the broken or damage of the rock core, caused by the larger change of the rock core structure due to the overlarge axial pressure can be avoided.
Description
Technical field
The present invention relates to rock core resistivity measurement technical field, particularly apply the device and method that to monitor axle pressure in a kind of rock core resistivity measurement.
Background technology
In petroleum geology exploration and logging technology field, the rock resistivity parameter is to divide water-oil interface and estimate the oiliness of reservoir and the important indicator of oil-containing degree.
What the experiment measuring of rock resistivity was measured usually is the resistance at rock core two ends, and the mensuration of resistance need be core holding unit by special rock core anchor clamps, normally rock core is put into specific clamper, two parallel end faces at rock core apply certain contact force (direction is vertical with the rock core end face), be that the pressure on the contact interface is (at this moment between rock core end face and the potential electrode, the contact interface pressure that links to each other with the axle pressure system just equals axle pressure), the axle pressure size that applies has determined the size of contact resistance, and then influences the resistance of measuring resistance; In addition, in the experiment measuring of rock resistivity, often for same block of rock core, need carry out its resistance value of repetitious measurement, if there is not the monitoring of axle pressure, each axle pressure that applies be at random with uncertain, it also is uncertain at random causing its contact resistance, this uncertainty at random directly influences resistivity measurements, finally is difficult to reach the evaluating reservoir level of expection, can not satisfy the production actual needs.
Summary of the invention
Technical matters to be solved by this invention provides and a kind ofly can apply the device and method of the axle pressure that can monitor when the rock core resistance measurement.
The present invention relates to apply the device that can monitor axle pressure be a kind of core holding unit, comprising: application of 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 roofs are offered the hole, and link to each other with described application of force assembly by screw thread; Described application of force assembly end is relative with described top electrode 6 tops;
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 core chamber 11 inner chamber two ends are placed in;
Described core chamber 11 is used for carrying rock core to be measured.
Further, described top electrode 6 and bottom electrode 9 link to each other with host computer RLC electric bridge instrument the two poles of the earth respectively, are used for showing the real-time resistance of rock core; Pressure transducer 5 external upper Displaying Meters are used for showing the axle pressure that applies.
Further, described application of force assembly comprises: handle 1, big screw rod 2, small screw 3 and application of force base plate 4;
Described small screw 3 one ends are embedded in described big screw rod 2 one ends, and the other end of described small screw 3 is fixed on the described application of force base plate 4; The other end of described big screw rod 2 and described handle 1 are fixedly linked; Described application of force base plate 4 is relative with described top electrode 6; The hole that described big screw rod 2 is offered by screw thread and described Π shape parts 10 roofs links to each other.
Further, described Π shape parts 10 afterbodys are offered barb, and described core chamber offers groove in 11 ends; Described barb is embedded in groove.
Further, also comprise conducting medium 7; Described conducting medium 7 places top electrode 6 and bottom electrode 9 to contact on the end face with rock core 8 to be measured respectively.
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 that can monitor 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; Apply regulatable axle pressure by application of force assembly to rock core end face to be measured, monitor the axle pressure of rock core end face to be measured simultaneously by pressure monitoring device in real time.
Further, described application of force assembly is application of force fulcrum with Π shape parts, compresses or loosens top electrode by rotating big screw rod, thereby apply regulatable axle pressure to rock core to be measured.
Further, the center of application of force base plate overlaps with the geometric center of rock core end face to be measured in the application of force assembly.
Further, described pressure monitoring device is pressure transducer; The monitoring end face of described pressure transducer is rock core to be measured and the end face that contacts of top electrode.
Further, at the upper and lower end face of described rock core to be measured couplant is set, increases the contact area of upper and lower electrode and rock core end face.
The device and method that applies the axle pressure that to monitor provided by the invention; Clamper, apply the axle pressure that to monitor by pressure transducer and application of force assembly and change pressure on rock core end face and the potential electrode surface of contact, when guaranteeing to measure on the clamper, two surface of contact of two electrodes and rock core are kept certain axle pressure down, make rock core end face and electrode can keep tight contact the under the certain pressure, effectively eliminate because there not being the axial compression monitoring to cause the uncertainty of interface pressure, thereby stablize contact resistance, improve the measuring stability energy, randomness and uncertainty that minimizing brings because of suddenly big or suddenly small axle pressure are guaranteed the stable of measurement result, reliably.The method that applies the axle pressure that can monitor can keep the Stability Analysis of Structures of rock core, avoids excessive axle pressure to make the rock core structure that bigger variation take place and causes the change of rock core electrical conduction mechanism even cause breaking or damaging of rock core.In addition, in the operation of continuous coverage repeatedly, can guarantee that by the monitoring axle pressure one of axle pressure makes peace stablely, avoid different axle pressures to cause the uncertain of contact resistance and then have influence on measurement result.Therefore, it is significant to apply the axle pressure that can monitor, and this device and method can promote the precision of rock core resistivity measurement to a certain extent.
Description of drawings
The structural representation of the clamper that Fig. 1 provides for the embodiment of the invention;
The application of force screw rod group structural representation that Fig. 2 provides for the embodiment of the invention;
The structural representation of the Π shape parts that Fig. 3 provides for the embodiment of the invention;
The structural representation of the core chamber that Fig. 4 provides for the embodiment of the invention;
Wherein, 1-handle, the big screw rod of 2-, 3-small screw, 4-application of 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
What the embodiment of the invention provided is a kind of for the rock core resistivity measurement, applies the device and method of the axle pressure that can monitor.
The device that adds the axle pressure that can monitor that the embodiment of the invention provides is a kind of clamper, comprising: handle 1, big screw rod 2, small screw 3, application of 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 big screw rod 2 one ends, and the other end of small screw 3 is fixed on the application of force base plate 4, and the other end and the handle 1 of big screw rod 2 are fixedly linked; Application of force base plate 4 is relative with top electrode 6; Π shape parts 10 roofs are offered the hole, link to each other with big 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 core chamber 11 inner chamber two ends are placed in.
Referring to Fig. 2, this device applies axle pressure by application of force screw rod group, comprising: handle 1, big screw rod 2, small screw 3 and application of force base plate 4; One end of small screw 3 is embedded in big screw rod 2 one ends, and the other end is fixed on the application of force base plate 4; Handle 1 is fixedly linked with big screw rod 2.
In view of difference core sample size to be measured, quality there are differences, needed application of force stroke is often different; Preferably, small screw 3 links to each other with big screw rod 2 by screw thread, is embedded in big screw rod 2 ends; According to different demands, rotation small screw 3 can make application of force stroke finely tune within the specific limits, thereby adapts to different measurement requirements.Screwed connection can make the connection of big small screw simple and reliable, and convenient disassembly is easily gone the easy maintenance of clamper.
Referring to Fig. 3, Fig. 4, Π shape parts 10 are used for connecting application of force screw rod group and core chamber 11, for application of force screw rod group provides the application of force strong point; Therefore, the end of Π shape parts 10 clamping core chamber 11 applies axle pressure by the application of force screw rod group that is embedded in the roof hole to the rock core in the core chamber.
Big screw rod 2 links to each other with Π shape parts 10 by screw thread, when applying axle pressure, by the rotation of big screw rod 2, makes application of force screw rod group produce axial displacement, and then produces 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, thereby the application of force precision of axle pressure is improved greatly; Also having avoided significantly on the other hand, axle pressure changes the rock core damage to be measured that causes.
In order to make Π shape parts 10 more firm with being connected of core chamber 11; Preferably, offer L type barb at Π shape parts 10 afterbodys, annular recess is offered in the end of core chamber 11 simultaneously; L type barb can be embedded in the annular recess.
For rock core 8 to be measured can fully be contacted with upper/lower electrode, preferred, 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 for use: conductive fabric or conducting resinl or aluminium foil or silver foil or chamois leather.The slit, hole that conducting medium 7 can be filled the rock core end face to a certain extent from but the conduction loss of pressure reduce; On the other hand from the space between the filling top electrode 6, bottom electrode 9 and the rock core to be measured 8 that divide, thereby reduce contact resistance, optimize measurement.
At the top, axle center of top electrode 6 fixation pressure sensor 5, be used for the axle pressure that monitoring top electrode 6 bears; By external Displaying Meter observed and recorded axle pressure.Axle pressure is given rock core 8 to be measured and bottom electrode 9 by top electrode 6 conduction; Therefore, the force value of pressure transducer 5 detections has also reflected the axle pressure that rock core 8 to be measured bears.
Before the experiment, by rotating small screw 3, make application of force base plate 4 and pressure transducer 5 keep suitable distance; During experiment, rock core 8 to be measured is put into core chamber 11; Turning handle 1 slowly, and big screw rod 2 slowly rotates, and drives small screw 3 and 4 axially-movables of application of force base plate, moves closer to pressure transducer 5; And then compress top electrode 6, when the force value of pressure transducer 5 monitorings reaches desired value, stop application of force operation.At this moment, axle pressure will remain at certain numerical value, and the pressure on the surface of contact of upper/lower electrode and rock core to be measured 8 is kept constant, thereby avoid because the influence of fluctuations measuring accuracy of interface pressure.
The embodiment of the invention provides is used for the rock core resistivity measurement, and the clamper that applies the axle pressure that can monitor is realized the monitoring of axle pressure, adjustable by application of force assembly and pressure transducer.Π shape parts are as application of force fulcrum, apply axle pressure reposefully by screw thread, change the pressure on the surface of contact between rock core end face and the potential electrode lentamente, two surface of contact of the upper and lower electrode of clamper and rock core are kept certain axle pressure when guaranteeing to measure, make rock core end face and electrode can keep tight contact the under the certain pressure, effectively eliminate because there not being axle pressure to monitor the uncertainty of the interface pressure that causes, thereby reduce contact resistance to a certain extent, and stable contact resistance; Improve measuring stability, reduce randomness and the uncertainty brought because of suddenly big or suddenly small axle pressure, guarantee the stable, reliable of measurement result.
Applying the method that can 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; Apply regulatable axle pressure by application of force assembly to rock core end face to be measured, monitor the axle pressure of rock core end face to be measured simultaneously by pressure monitoring device in real time.
Before the rock core resistivity measurement, the core chamber that rock core is put into core holding unit, place between the upper and lower electrode, thereby both ends of the surface are joined and externally measured circuit formation loop with upper and lower electrode respectively.
During measurement, apply regulatable axle pressure by application of force assembly to rock core end face to be measured; Compress or loosen top electrode by rotating big screw rod, and then regulate the axle pressure of rock core end face to be measured; In this process, monitor the size of the axle pressure of rock core end face to be measured in real time by pressure monitoring device, thereby make the adjusting of axle pressure more accurate.
Application of force assembly is application of force fulcrum with Π shape parts in applying the process of axle pressure, compresses or loosens top electrode by rotating big screw rod, thereby apply regulatable axle pressure to rock core to be measured.Π shape parts clamp core chamber and form an integral body with it, when the big screw rod rotation application of force core chamber and application of force base plate mutually close or away from, thereby axle pressure on the surface of contact of the top electrode that is placed in the core chamber, rock core to be measured and bottom electrode is increased or reduce, thereby reach the purpose that applies regulatable axle pressure.
In order to optimize the action effect of axle pressure, the center of application of force base plate overlaps with the geometric center of rock core end face to be measured; Thereby guarantee that the axle pressure apply is coaxial with the axle pressure that rock core end face to be measured produces, thereby guarantee stressed even of rock core end face to be measured; Thereby protection rock core structure is not damaged and is guaranteed the axle pressure monitoring accuracy.
The regulation and control of axle pressure can be finished by application of force assembly, but the axle pressure that applies monitoring just needs pressure monitoring device.Thereby pressure monitoring device instructs the operation that applies of axle pressure by the axle pressure of direct monitoring rock core end face to be measured.Make on the one hand and apply axle pressure foundation to some extent, in multi-pass operations, keep the stable axle pressure environment that can survey on the other hand.
Specify the practical application of this method below by the embodiment of a rock core resistivity measurement.
1) utilize rotary sidewall sampling to obtain 15 core samples;
2) to above-mentioned serial rock core, rock core being processed processing backs such as (diameter is 1 inch, and length is 3 centimetres-7 centimetres cylindric), washing oil, desalination, oven dry and saturated equivalent local water according to SY/T5336-2006 " core analysis method " standard packs into to be measured in the glass exsiccator together with equivalent local water;
3) to the described serial rock core of step 1), carry out resistivity measurement and calculating according to " laboratory measurement of rock resistivity parameter and computing method (SY/T5385-2007) " normal process;
4) the rock core measured material embeds the bottom of Π type parts in annular Cao in the core chamber topmost outside of holding the device folder for applying the clamper of monitoring axle pressure, guarantees that this parts center is installed in the axle center that is positioned at core holding unit;
5) the resistivity measurement bottom electrode in the core holding unit is taken out, put into a standard bloom then and carry out system's zeroing, at first probe power input and signal output lead are connected with the digital display gauge outfit, sensor is carried out scale, do not apply axle pressure when implementing the zeroing program, transfer the full width of cloth then to apply the full scale axle pressure;
6) the big screw rod of precession, when the stress contact of application of force base plate and sensor near the time, slowly operating grip guarantees to contact the smooth transition of pressure, avoids contact interface to cause the rock core structural 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 gauge outfit of pressure transducer, continue the variation of slowly pressurization while monitoring resistor up to resistance stabilization, keep the axle pressure of this moment, the axle pressure direction that applies must be perpendicular to the sensor stress surface;
7) then carry out scale and the effect of resistivity tester.The upper and lower electrode of resistivity measurement is connected with the resistivity tester lead-in wire, guarantees the stable of power supply and test environment temperature, system's zeroing scale finishes, and takes out bloom then, carries out effect with measuring resistance, prepares the test of rock core;
8) rock core with abundant saturated equivalent local water takes out, and wipes out swimming of surface earlier, and the rock core weight that weighs with scale also records this weight;
9) the 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 the rock core end face, packing into then applies in the rock core resistivity measurement clamper of adjustable and monitoring axle pressure;
10) with upper and lower two electrodes of clamper with after measuring bridge is connected, the big screw rod of precession slowly again; The pore texture of looking rock core applies corresponding axle pressure, loose rock core should apply slightly little axle pressure, densification is then corresponding bigger, must carry out slow reinforcing from small to large, and check the variation of the digital display gauge outfit monitoring axle pressure of pressure transducer, meanwhile, observe the variation of resistance value by the electric bridge instrument that connects the rock core electrode, resistance value is from diminishing greatly gradually, when tending towards stability gradually, resistance value no longer diminishes when beginning on the contrary slowly to go up, (this moment, the rock core saturation degree was 100% to the lowest resistance value of record rock core, its resistance value is R0), and write down the axle pressure size that applies, with this reference axle pressure of measuring as rock core resistance R t under the different water cut saturation degree;
11) adopt the desaturation method to carry out displacement to above-mentioned rock core, displacement forward sight rock core pore texture adds certain confined pressure earlier, applying the displacement that is lower than this confined pressure 50psi again presses, great changes will take place because of the reduction meeting of water saturation for the resistance that drives rock core in the journey, after treating that this displacement is depressed water saturation and rock core resistance and tended towards stability, record this resistance value; Removal of core is used electronic balance weighing fast, and record;
12) reinstall the rock core after the weighing in the core holding unit fast, the clockwise big screw rod of precession, apply the size of axle pressure with reference to the axle pressure value before taking out, then according to the step 11) operation that experimentizes, strengthening confined pressure and displacement gradually presses, generally choose 6 different water saturation measurement points, water saturation and resistance R t value stabilization and record up to rock core calculate corresponding resistivity and reservoir parameter according to Ohm law and Archie equation etc. at last.
Originally be to pass through in the example in the measurement operation of rock core resistivity, to apply the axle pressure that to monitor, avoided the fluctuation of axle pressure or uncertainty to impact to measurements resistivity.But when applying monitor shaft to pressure operation, the amplitude of variation of axle pressure should be determined according to the quality of rock core to be measured; Guarantee that applying of axle pressure do not destroy the structure of rock core to be measured.Present embodiment adopts screwed connection as the ways of connecting of application of force assembly and core holding unit to be measured, can make the amplitude of variation of axle pressure maintain a lower level, can improve the amplitude resolution of axle pressure, because the amplitude that the big screw rod 2 of rotation axially moves in the threaded hole of Π shape parts 10 is less with respect to the amplitude that directly axially moves, also more stable, have positive effect for the structure that keeps rock core 8 to be measured.
The device and method that applies the axle pressure that to monitor provided by the invention; Clamper applies the axle pressure that can monitor by pressure transducer and application of force assembly and changes pressure on rock core end face and the potential electrode surface of contact, when guaranteeing to measure on the clamper, two surface of contact of two electrodes and rock core are kept certain axle pressure down, make rock core end face and electrode can keep tight contact the under the certain pressure, effectively eliminate because there not being the axial compression monitoring to cause the uncertainty of interface pressure, thereby stablize contact resistance, improve the measuring stability energy, randomness and uncertainty that minimizing brings because of suddenly big or suddenly small axle pressure are guaranteed the stable of measurement result, reliably.In the rock core resistivity measurement, apply the axle pressure that to monitor and apply constant axle pressure by application of force assembly to rock core to be measured, rock core to be measured can closely be contacted with contact electrode; Avoided the axle pressure of fluctuation to the influence of contact resistance.In addition, in the operation of continuous coverage repeatedly, can guarantee that by the monitoring axle pressure one of axle pressure makes peace stablely, avoid different axle pressures to cause the uncertain of contact resistance and then have influence on measurement result.Therefore, it is significant to apply the axle pressure that can monitor, and this device and method can promote the precision of rock core resistivity measurement to a certain extent.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. a clamper is characterized in that, comprising: application of 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 is offered the hole, and links to each other with described application of force assembly by screw thread; Described application of 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 used for carrying rock core to be measured.
2. clamper as claimed in claim 1, it is characterized in that: described top electrode (6) and bottom electrode (9) link to each other with host computer RLC electric bridge instrument the two poles of the earth respectively, are used for showing the real-time resistance of rock core; The external upper Displaying Meter of pressure transducer (5) is used for showing the axle pressure that applies.
3. clamper as claimed in claim 1 is characterized in that, described application of force assembly comprises: handle (1), big screw rod (2), small screw (3) and application of force base plate (4);
Described small screw (3) one ends are embedded in described big screw rod (2) one ends, and the other end of described small screw (3) is fixed on the described application of force base plate (4); The other end of described big screw rod (2) and described handle (1) are fixedly linked; Described application of force base plate (4) is relative with described top electrode (6); The hole that described big screw rod (2) is offered by screw thread and described Π shape parts (10) roof links to each other.
4. clamper as claimed in claim 1, it is characterized in that: described Π shape parts (10) afterbody is offered barb, and described core chamber (11) offers groove in the end; Described barb is embedded in groove.
5. clamper as claimed in claim 1 is characterized in that: also comprise conducting medium (7); Described conducting medium (7) places top electrode (6) and bottom electrode (9) to contact on the end face with rock core to be measured (8) respectively.
6. clamper as claimed in claim 5, it is characterized in that: described conducting medium (7) is conductive fabric or conducting resinl or aluminium foil or silver foil or chamois leather.
7. one kind is passed through above-mentioned clamper, applies the method that can monitor axle pressure, and 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; Apply regulatable axle pressure by application of force assembly to rock core end face to be measured, monitor the axle pressure of rock core end face to be measured simultaneously by pressure monitoring device in real time.
8. the method that can monitor axle pressure that applies as claimed in claim 7, it is characterized in that: described application of force assembly is application of force fulcrum with Π shape parts, compresses or loosens top electrode by rotating big screw rod, thereby apply regulatable axle pressure to rock core to be measured.
9. the method that can monitor axle pressure that applies as claimed in claim 7, it is characterized in that: the center of application of force base plate overlaps with the geometric center of rock core end face to be measured in the application of force assembly.
10. the method that can monitor axle pressure that applies as claimed in claim 7, it is characterized in that: described pressure monitoring device is pressure transducer; The monitoring end face of described pressure transducer is rock core to be measured and the end face that contacts of top electrode.
11. the method that can monitor axle pressure that applies as claimed in claim 7 is characterized in that: the upper and lower end face at rock core to be measured arranges couplant, increases the contact area of electrode and rock core end face.
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