CN210465330U - Online ion sensor for drilling fluid - Google Patents
Online ion sensor for drilling fluid Download PDFInfo
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- CN210465330U CN210465330U CN201921074254.2U CN201921074254U CN210465330U CN 210465330 U CN210465330 U CN 210465330U CN 201921074254 U CN201921074254 U CN 201921074254U CN 210465330 U CN210465330 U CN 210465330U
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Abstract
The utility model relates to an online ion sensor of drilling fluid contains: a protective housing; the composite electrode sensor is arranged in the protective shell, comprises an ion sensitive membrane electrode and a reference electrode which are fixedly arranged at one end part of the composite electrode sensor, and respectively measures and outputs the electrode electromotive force in the drilling fluid; and the transmitter is connected with the ion sensitive membrane electrode through a first signal outgoing line and connected with the reference electrode through a second signal outgoing line, and the voltage difference between the first signal outgoing line and the second signal outgoing line is acquired and measured. The utility model discloses simple structure, the stable performance, simple to operate, low cost, long service life realizes at the drilling scene to the long-time continuous on-line measurement of last drilling fluid mesoion concentration.
Description
Technical Field
The utility model relates to a drilling fluid ion on-line measuring device that can work for a long time steadily specifically indicates a drilling fluid on-line ion sensor for well drilling scene.
Background
The change of ion concentration in the mud can not only represent the performance of the mud, but also reflect the immersion condition of formation fluid. Therefore, the online measurement of the ion concentration in the mud can provide decisive data for field engineering decision and formation evaluation.
At present, the method for measuring the ion concentration in the mud in a drilling site still remains a method for carrying out titration measurement on the concentration of the chloride ion after sampling by a mud engineer, needs manual operation, has long measurement time, and cannot carry out rapid and continuous online measurement.
In addition, although research results have provided that the anion and cation concentrations can be measured on site by using ion chromatography, the ion chromatography is not suitable for use in drilling sites because it has high requirements for operators, expensive equipment, high material cost and environmental protection.
Therefore, in the prior art, the online continuous analysis of the ion concentration of the slurry on the drilling site still has great difficulty. Based on the foregoing, the utility model provides an online ion sensor of drilling fluid for drilling is on-spot effectively solves shortcoming and the restriction that exists among the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an online ion sensor of drilling fluid, simple structure, the stable performance, simple to operate, low cost, long service life realizes at the drilling scene to returning the long-time continuous on-line measurement of ion concentration in the drilling fluid.
In order to achieve the above object, the utility model provides an online ion sensor of drilling fluid contains: a protective housing; the composite electrode sensor is arranged in the protective shell, comprises an ion sensitive membrane electrode and a reference electrode which are fixedly arranged at one end part of the composite electrode sensor, and respectively measures and outputs the electrode electromotive force in the drilling fluid; and the transmitter is connected with the ion sensitive membrane electrode through a first signal outgoing line and connected with the reference electrode through a second signal outgoing line, and the voltage difference between the first signal outgoing line and the second signal outgoing line is acquired and measured.
And the transmitter transmits the measured voltage difference to the logging instrument in a wired or wireless mode.
And a filter screen is arranged at a position, close to the end part of one end of the composite electrode sensor, on the protective shell, and is used for filtering rock debris particles in the drilling fluid.
The reference electrode adopts a platinum electrode.
The ion sensitive membrane electrode adopts a chloride ion selective electrode, and the chloride ion concentration in the drilling fluid is obtained by measuring the electrode electromotive force of the chloride ion selective electrode in the drilling fluid.
The chloride ion selective electrode is prepared by pressing silver chloride and silver sulfide materials into a film.
The ion sensitive membrane electrode adopts a sulfur ion selective electrode, and the concentration of sulfur ions in the drilling fluid is obtained by measuring the electrode electromotive force of the sulfur ion selective electrode in the drilling fluid.
The sulfur ion selective electrode is prepared by pressing a silver-silver sulfide material into a film.
The drilling fluid on-line ion sensor is arranged in a drilling fluid flow path behind the vibrating screen.
To sum up, the online drilling fluid ion sensor has the advantages of simple structure, stable performance, low cost, convenient installation and maintenance, and suitability for large-scale popularization and application; the sensor is suitable for an oil-gas exploration field, and the sensor mounting position is reasonably arranged, so that the long-time on-line ion concentration measurement in a drilling fluid system of the oil-gas exploration field is realized, the service life is greatly prolonged, and the low-cost on-line monitoring of the ion concentration of the drilling fluid becomes possible.
Drawings
Fig. 1 is a schematic structural diagram of an online drilling fluid ion sensor according to the present invention;
fig. 2 is a schematic diagram of a measurement calibration result value and a fitting curve of the online ion sensor for drilling fluid in the present invention;
fig. 3 is a schematic diagram of a method for measuring drilling fluid ions by using the online drilling fluid ion sensor of the present invention.
Detailed Description
The technical contents, construction features, achieved objects and effects of the present invention will be described in detail by preferred embodiments with reference to fig. 1 to 3.
As shown in FIG. 1, for the utility model provides an online ion sensor of drilling fluid for well drilling scene contains: a protective housing 13; the composite electrode sensor 11 is arranged in the protective shell 13, comprises an ion sensitive membrane electrode 111 and a reference electrode 112 which are fixedly arranged at one end part of the composite electrode sensor 11, and respectively measures and outputs the electrode electromotive force in the drilling fluid; and the transmitter (not shown) is connected with the ion sensitive membrane electrode 111 through the first signal outgoing line 14 and connected with the reference electrode 112 through the second signal outgoing line 15, and acquires and measures the voltage difference between the first signal outgoing line 14 and the second signal outgoing line 15.
In the preferred embodiment of the present invention, the voltage difference value measured by the transmitter is transmitted to the logging instrument in a wired or wireless manner, and is used as the online monitoring index of the ion concentration of the drilling fluid.
In the preferred embodiment of the present invention, the protective casing 13 is provided with a filter screen 131 at a position close to the end of the composite electrode sensor 11, so as to effectively filter the rock debris particles in the drilling fluid, and prevent the composite electrode sensor 11 from being directly eroded by large particulate matter in the drilling fluid, thereby prolonging the service life of the composite electrode sensor.
In the preferred embodiment of the present invention, the transmitter is an explosion-proof transmitter to meet the safety requirements of the drilling site.
In the preferred embodiment of the present invention, the reference electrode 112 is an electrode that is stable in properties and potential in the drilling fluid environment, and preferably, the reference electrode 112 is a platinum electrode.
In the preferred embodiment of the present invention, the ion-sensitive membrane electrode 111 employs a chloride ion-selective electrode, and finally obtains the chloride ion concentration in the drilling fluid by measuring the electrode electromotive force of the chloride ion-selective electrode in the drilling fluid.
Furthermore, the chloride ion selective electrode is prepared by pressing silver chloride and silver sulfide materials into a film.
Of course, in other preferred embodiments of the present invention, other ion concentrations in the drilling fluid may be measured by using other ion-selective electrodes as the ion-sensitive membrane electrode 111. For example, the utility model can adopt Ag-Ag2The S material is pressed into a film to form a sulfur ion selective electrode serving as an ion sensitive membrane electrode 111, so that the concentration of sulfur ions in the drilling fluid is measured.
In the preferred embodiment of the present invention, the first signal outgoing line 14 is connected to the ion sensitive membrane electrode 111 by welding, and penetrates out from the other end of the composite electrode sensor 11 and is connected to the transmitter; similarly, the second signal lead 15 is connected to the reference electrode 112 by welding, and penetrates out from the other end of the composite electrode sensor 11 and is connected to the transmitter.
In the preferred embodiment of the present invention, the drilling fluid on-line ion sensor further comprises a lead wire protection housing 12 disposed outside the first signal lead wire 14 and the second signal lead wire 15 between the composite electrode sensor 11 and the transducer, so as to prevent the circuit from being broken due to damage.
Generally, during logging, various measurement devices (including a drilling fluid online ion sensor) are generally considered to be arranged in a buffer tank or a buffer tank 3 (as shown in fig. 3) after the drilling fluid returns out of the elevated tank 4, so that first-hand related information of the drilling fluid returning in the drilling process, particularly formation gas samples carried in the drilling fluid, can be obtained. However, as the upward-returning drilling fluid carries a large amount of rock debris particles crushed by stratum, the service life of various measuring devices (including drilling fluid online ion sensors) can be seriously influenced, and generally can not exceed 1 day.
Based on this, as shown in fig. 3, the present invention provides a drilling fluid on-line ion sensor 1 in the drilling fluid flow path behind the vibrating screen 2. Because the ionic components in the drilling fluid are different from the gas carried by the drilling fluid, the drilling fluid is not easily influenced by the external environment, and the ionic concentration of the drilling fluid is not changed after the drilling fluid is filtered and desanded by the vibrating screen 2. Therefore, the online drilling fluid ion sensor 1 is arranged in a drilling fluid flow path behind the vibrating screen 2, so that the erosion corrosion of rock debris particles, sand, and the like mixed in the drilling fluid on the online drilling fluid ion sensor 1 can be effectively avoided, the normal use of the online drilling fluid ion sensor is ensured, and the service life of the online drilling fluid ion sensor is greatly prolonged.
Adopt online ion sensor of drilling fluid can carry out the drilling fluid ion concentration measurement of well drilling scene, concrete method contains following step:
s1, arranging the drilling fluid online ion sensor in a drilling fluid flow path behind the vibrating screen 2;
s2, outputting the electrode electromotive force of the reference electrode 112 in the drilling fluid through a second signal outgoing line 15;
the reference electrode 112 is an electrode with stable properties and potential in a drilling fluid environment, that is, the electrode electromotive force of the reference electrode 112 is a known constant, and the value thereof is determined by the kind of the reference electrode used specifically;
s3, outputting the electrode electromotive force of the ion sensitive membrane electrode 111 in the drilling fluid through the first signal outgoing line 14;
wherein, the electrode electromotive force of the ion sensitive membrane electrode 111 is only related to the corresponding ion concentration in the drilling fluid;
s4, the transmitter measures the voltage difference between the first signal outgoing line 14 and the second signal outgoing line 15 and transmits the voltage difference to the logging instrument;
and S5, calculating the drilling fluid ion concentration related to the ion sensitive membrane electrode 111 by the logging instrument according to the measured voltage difference.
The following, through utilizing the utility model provides a drilling fluid is at the specific embodiment of ionic sensor measurement chloride ion concentration on line, further explains the technical scheme and the technological effect of the utility model.
In this embodiment, the ion-sensitive membrane electrode 111 is made of a chloride-selective electrode and is made by pressing silver chloride and silver sulfide materials into a membrane. The reference electrode 112 is a platinum electrode. What is finally needed is the concentration of chloride ions therein by measurement and calculation.
According to the electrode electromotive force formula of chloride ions, the method specifically comprises the following steps:
wherein E represents a voltage difference between the first signal outlet 14 and the second signal outlet 15, i.e. a measurement output value of the drilling fluid on the on-line ion sensor;
φPtthe electrode electromotive force of the platinum electrode is considered to be phi because the property and the potential of the electrode are relatively stable in the drilling fluid environmentPtIs a constant;
r represents a molar gas constant; t represents temperature (standard temperature scale); n represents a molar coefficient; f represents a Faraday constant; gamma rayCl-Represents the activity coefficient of chloride ions; kapRepresents the solubility product; the parameters are all constant values which can be checked;
cCl-the concentration of chloride ions in the drilling fluid is represented, and the parameter is finally obtained through measurement and calculation;
due to the fact that
Is very small, about-0.002, and thus, the electrode electromotive force of the chloride ion selective electrode can be approximately expressed as
And parameters therein
R, T, n and F are all constant, so that the electrode electromotive force of the chloride ion selective electrode is only equal to the chloride ion concentration cCl-Correlation;
from the above, the formula of the electrode electromotive force of the chloride ion can be approximated as:
wherein, according to the above, wherein,
φPtr, T, n, F are constants, therefore, according to the utility model discloses well drilling fluid is at on-line ion sensor's output value E (the voltage difference between chloride selectivity electrode and the reference electrode), can calculate the chloride concentration c who obtains in the drilling fluidCl-。
As shown in fig. 2, it is a schematic diagram of the measured calibration result value and the fitting curve of the online ion sensor for drilling fluid of the present invention. Wherein the fitting curve y is a-b × ln (x + c)y is equal to E in the above formula, x is equal to c in the above formulaCl-A is equal to that in the above formula
It is constant-157.6559, b is equal to that in the above formula
At 300K, the constant is-20.02484, and c has a value of 0.
According to the above, in other preferred embodiments of the present invention, it is obvious that other ion concentrations in the drilling fluid can be measured and calculated, and only the corresponding ion sensitive membrane electrode is needed.
To sum up, the online drilling fluid ion sensor has the advantages of simple structure, stable performance, low cost, convenient installation and maintenance, and suitability for large-scale popularization and application; the sensor is suitable for an oil-gas exploration field, and the sensor mounting position is reasonably arranged, so that the long-time on-line ion concentration measurement in a drilling fluid system of the oil-gas exploration field is realized, the service life is greatly prolonged, and the low-cost on-line monitoring of the ion concentration of the drilling fluid becomes possible.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (7)
1. A drilling fluid on-line ion sensor for use at a drilling site, comprising:
a protective housing;
the composite electrode sensor is arranged in the protective shell, comprises an ion sensitive membrane electrode and a reference electrode which are fixedly arranged at one end part of the composite electrode sensor, and respectively measures and outputs the electrode electromotive force in the drilling fluid;
and the transmitter is connected with the ion sensitive membrane electrode through a first signal outgoing line and connected with the reference electrode through a second signal outgoing line, and the voltage difference between the first signal outgoing line and the second signal outgoing line is acquired and measured.
2. The drilling fluid on-line ion sensor of claim 1, wherein the transmitter transmits the measured voltage difference to a logging tool via wired or wireless means.
3. The in-line drilling fluid ion sensor as claimed in claim 1, wherein a filter screen is disposed on the protective housing near one end of the composite electrode sensor for filtering debris particles in the drilling fluid.
4. The drilling fluid on-line ion sensor of claim 1, wherein the reference electrode is a platinum electrode.
5. The drilling fluid online ion sensor according to claim 1, wherein the ion sensitive membrane electrode adopts a chloride ion selective electrode, and the chloride ion concentration in the drilling fluid is obtained by measuring the electrode electromotive force of the chloride ion selective electrode in the drilling fluid.
6. The drilling fluid online ion sensor according to claim 1, wherein the ion sensitive membrane electrode adopts a sulfur ion selective electrode, and the concentration of the sulfur ion in the drilling fluid is obtained by measuring the electrode electromotive force of the sulfur ion selective electrode in the drilling fluid.
7. The drilling fluid in-line ion sensor of claim 1, wherein the drilling fluid in-line ion sensor is disposed in a drilling fluid flow path after the shaker.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243912A (en) * | 2019-07-10 | 2019-09-17 | 上海神开石油科技有限公司 | A kind of online ion transducer of drilling fluid and ion concentration measurement method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243912A (en) * | 2019-07-10 | 2019-09-17 | 上海神开石油科技有限公司 | A kind of online ion transducer of drilling fluid and ion concentration measurement method |
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