SU1073654A1 - Device for determination of mountain rock porosity - Google Patents

Abstract

A device for determining the porosity of mountainous rocks containing a sampler, an NMR unit and a recording unit, characterized in that, in order to shorten the measurement time and improve the accuracy of porosity measurement, a magnetic separation unit, a fractionation unit, a depth indication unit, a correction unit and a volume comparing unit, wherein the fractionation unit is connected to the sampler and through the magnetic separation unit to the NMR unit, the first output of the HiMP unit is connected to the input of the volume comparator unit, a swarm with the first input of the correction block 6, the output of the volume comparing unit is connected to the upstream input of the correction block, the first output of the correction block is connected to the first input of the regitrac block, the second to the first input of the depth indication block, the second inlet of the depth display unit connects | The fractionation unit, the depth indication unit output, is connected to the second input of the registration unit. 1 oo oe

Description

The invention relates to geophysical studies, specifically to petrophysical analysis, and can be used to determine the porosity of both mining rocks and any other non-ferromagnetic materials.

A device is known for determining the porosity of rocks from a slurry using a gas-gasimetr method. The device comprises a sampling unit, a fractionation unit, a unit for binding the selected sludge to the depths of measurement, and measuring equipment l,

The disadvantage of such a device is the need to extract and dry the samples taken for it, which leads to additional measurement errors.

Closest to the present invention is a device for determining the porosity of rocks, comprising a sampler, an NMR unit and a C2 J recording unit,

The disadvantage of this device is that in order to accurately measure the poris, it is necessary to prepare a sample of a strictly defined shape and size, which increases the labor of the work and their duration,

The purpose of the invention is the reduction of the measurement time and the increase in the accuracy of porosity measurement.

The goal is achieved by the fact that the .n.rin device for determining the porosity of mountains, containing the sampler, is an NMR unit v; The registration block, additionally, a magnet separation block, a fractionation block, a depth indication block, a correction block: an i-i co-pair and a volume block ;. at the same time, the fractionirozayn unit is connected to the sampler and through the unit of magnetic separation with the NMR block, the first output of the NMR unit is ipek with the inlet of the akarak of the comparative volume, 6th; b; Correction: chcution, output of the computer unit of volumes is connected to the BTOREYM input of the correction unit, the first input of the correction unit is connected to the first input; 3 ls of registration, - the second input to the per-input input of the indication unit is deep; The second input of the depth indication unit is connected to b by means of choking; the output of the display block of the bast is connected to the second one of the block of regis: racik ,,

In the drawing of the image / hen, the block diagram of the device for determining the porosity and the horns X is about

The device contains the sampling of the If interconnecting gadget with fractionation unit 2, which is connected to the depth indicating unit 3 and the agitnant separation unit 4, the NMR unit 5. whose outputs connect the inputs of the comparative block of the unit;

correction 7, the output of the correction unit, 7 is connected to the input of the registration unit 8, which is also connected to the output of the depth indication unit 3.

The device works as follows,

The input of fractionation unit 2 from the sampler 1, installed at the mouth of the drilling well, receives sludge material, which is sorted into fractions with particle sizes greater than 3 and less than 8 mm (for example, 3-5 and 6-8 mm)

A slurry fraction of a certain size is fed to the depth indication unit 3 and to the magnetic separation unit 4, while in the depth indication unit 3, which is intended to establish the depth of the source rock in the well section from which the sample is obtained, and contains a counting scheme, sludge particle size sensors, flow rate and composition of drilling mud, well depth, mechanical penetration rate, and simply, and the site for adjusting the sludge depth compensation node for petrophysical reference points, is estimated by the depth ina parent rock from which a particular size particle slurry vybureny,

- The fractions of the ishama entering the magnetic separation unit 4 are cleaned of iron inclusions (shavings, hardened;), which dampen and distort the observed NMR signal from the original rock formation: The magnetic separation unit 4 has a tape drive mechanism that moves the sampled sample, W, a llama in a magnetic field is electromagnetically: xy, the elements located above this sample, as well as elements for removing extracted inclusions,

The magnet lifting force and the speed of moving the ribbon web with the test specimen are set, depending on the size of the fraction of this sample, by the counting-decisive device associated with fractionation unit 2.

The sludge thus separated is fed to in, the stroke of the NMR unit 5, which contains a sensor for the sample of sludge under study and a system for measuring the NMR signal and the interval between high-frequency pulses from this sample. This data is fed to the inputs of the unit of volume b and the correction unit 7.-,

The volumes of the threshold space and the interparticle space, as well as the solid phase of the sludge sample, which correspond to the measured amplitudes of the NMR signals, are estimated by means of a unit for comparing volumes 6. The unit for comparing volumes includes a manipulation unit, memory elements and a calculating unit. The manipula- tion unit places the tube with the reference hydrogen-containing fluid in the NMR sensor and sends a command pulse to the NMR unit 5, after which a measurement is made, the received signal goes to the memory elements and the command node of the manipulation unit, then the manipulation unit performs a shift test tubes with the reference hydrogen-containing liquid to the test tube with the sample and the specified liquid, gives a signal for measurement to the NMR unit. The measured signal also goes to the memory elements and the command device, after which anipul insulating filling unit dose tubes produced more heavy and viscous liquid, which replaces the reference liquid in the interparticle volume. The command for measuring the NMR signal gives the measured signal along with the two previously measured signals. The counting device determines the specificity of the sample K by the form K Ad-A + A and the amplitude of the signal is purely where AJ is a hydrogen-containing liquid and the amplitude of the signal from the liquid remaining in the interparticle space; The amplitude of the signal from the fluid in the pore space of the sample. The signal corresponding to the sample porosity comes from the output of the counting node’s decision block of volumes 6 to the input of correction block 7 At the same time, the input of correction block 7 receives a signal from the NMR block 5, based on these signals, the material composition of the sample is determined in the correction block 7 , the NMR characteristics of this composition are compared with the analogous characteristics of the rock mass and corrected in accordance with this porosity value. The S.-block of correction 7 sends a signal to the block of indication of depths 3, which characterizes the material composition of the sample under study for the reference correction of the initial depth of sampling of this sample. From the depth indication unit 3 and from the correction unit 7, the signals arrive at the recording unit 8 for recording, in a two-coordinate system for measuring the porosity of rocks in the well section with a depth in the form of a corresponding slurgram of porosity. The recording of shlagramgrams is carried out by means of a tape-testing mechanism, the speed of which is controlled by the depth display unit, and the deviation is set by a voltage converter proportional to the amount of porosity in the mechanical or other deviation of the fixing element on the tape, film, paper. The use of the invention provides the following simplification of measurements and reduction of the time they are carried out by eliminating the operations of drying, extracting, processing samples. In this case, it is possible to conduct continuous and operational monitoring of the process of drilling a well, and to reduce the cost of geological exploration.

Claims (1)

A device for determining the porosity of rocks, containing a sampler, an NMR unit and a registration unit, characterized in that, in order to reduce the measurement time and increase the accuracy of the porosity measurement, a magnetic separation unit, a fractionation unit, a depth indication unit, a correction unit and a volume comparation unit, wherein the fractionation unit is connected to the sampler and through the magnetic separation unit to the NMR unit, the first output of the NMR unit is connected to the input of the volume compaction unit, the second the first input of the correction unit, the output of the volume comparator unit is connected to the second input of the correction unit g, the first output of the correction unit is connected to the first input of the registration unit / the second to the first input of the depth indication unit, the second input of the depth indication unit is connected to j '* * · * 'By the fractionation unit, the output of the depth indication unit _{2 is} connected to the second input of the registration unit.