CN107676088B - Method for monitoring content of coal dust in coal-bed gas well output liquid - Google Patents
Method for monitoring content of coal dust in coal-bed gas well output liquid Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 129
- 239000002817 coal dust Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
- 239000003245 coal Substances 0.000 claims abstract description 206
- 239000011435 rock Substances 0.000 claims abstract description 67
- 239000000843 powder Substances 0.000 claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 37
- 230000000704 physical effect Effects 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 6
- 238000003760 magnetic stirring Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 14
- 238000012360 testing method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005065 mining Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
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Abstract
The invention discloses a method for monitoring the content of coal dust in output liquid of a coal-bed gas well, and belongs to the technical field of coal-bed gas well exploitation. The method comprises the following steps: acquiring coal rock samples with various physical property parameters in a target area; determining a coal rock sample consistent with physical parameters of coal dust in the output liquid of the coal bed gas well to be monitored as a sample to be detected, and grinding the sample into a coal dust sample; obtaining blank stratum fluid without coal dust in a target area, and preparing a plurality of standard colorimetric liquids with different mass concentrations of coal dust samples by using the blank stratum fluid and the coal dust samples; respectively measuring turbidity values of a plurality of standard colorimetric liquids; acquiring a mathematical relation between the mass concentration and turbidity values of the coal powder according to the turbidity values of the plurality of standard colorimetric liquids; and obtaining a production liquid from the coal-bed gas well to be monitored as a monitoring sample, measuring the turbidity value of the monitoring sample, and calculating to obtain the mass concentration of the monitoring sample by substituting the turbidity value of the monitoring sample into the mathematical relation. The method has simple operation and short time consumption.
Description
Technical Field
The invention relates to the technical field of coal-bed gas well exploitation, in particular to a method for monitoring the content of coal dust in output liquid of a coal-bed gas well.
Background
Coalbed methane is mainly adsorbed on the particle surface of the coal matrix, is partially dissociated in coal pores, and is rarely dissolved in the liquid of the coalbed. In the process of exploiting the coal bed gas well, the pressure of a coal reservoir is reduced by discharging and exploiting liquid in a coal bed, and then the coal bed gas well is exploited, wherein the coal bed liquid discharged to the ground is called coal bed gas well output liquid. However, coal has low compressive strength and tensile strength and is easily broken into pulverized coal, and in the process of mining coal bed gas wells, the coal rock is easily vibrated or broken by the acting force of mining equipment to generate the pulverized coal, so that the liquid in the coal bed contains the suspended pulverized coal. Coal powder in the coal bed liquid can block gaps among coal beds along with the flowing of the coal bed liquid, so that the permeability of the coal beds is reduced, the yield of coal bed gas is influenced, and in the process of discharging and extracting the coal bed liquid, the coal powder is easy to deposit on extraction equipment or pipelines in a well, so that the normal extraction of a coal bed gas well is influenced. Based on the above, monitoring the content of the pulverized coal in the output liquid of the coal-bed gas well obtained by drainage and mining is an important index for analyzing the production state of the coal-bed gas well. Therefore, it is necessary to provide a method for monitoring the content of coal dust in the produced fluid of the coal-bed gas well.
The method for monitoring the content of coal dust in the output liquid of the coal bed gas well in the prior art comprises the following steps: the method comprises the steps of obtaining a coal bed gas well output liquid sample by using a measuring cup, standing, filtering and drying precipitates to obtain coal powder after the coal powder is precipitated, measuring the quality of the coal powder, and calculating the mass concentration of the coal powder in the coal bed gas well output liquid according to the ratio of the mass of the coal powder to the mass of the coal bed gas well output liquid sample. The production state of the coal-bed gas well can be monitored by measuring the content of the coal dust in the output liquid of the coal-bed gas well by adopting the method for multiple times.
The inventor finds that the prior art has at least the following problems:
the prior art is adopted to monitor the production state of the coal-bed gas well, the content of the coal dust in the output liquid of the coal-bed gas well needs to be tested for multiple times, and the time for each test is 1-3 days, so that the time consumed is long.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for monitoring the content of coal dust in the output liquid of a coal bed gas well, which is simple and short in time consumption. The specific technical scheme is as follows:
the invention provides a method for monitoring the content of coal dust in an output liquid of a coal bed gas well, which comprises the following steps:
step a, obtaining coal rock samples with various physical property parameters in a target area.
And b, determining a coal rock sample which is consistent with the physical property parameters of the coal powder in the output liquid of the coal bed gas well to be monitored from the coal rock sample as a sample to be detected, and grinding the sample to be detected into a coal powder sample.
And c, obtaining blank stratum liquid without coal dust in the target area, and preparing a plurality of standard colorimetric liquids with different mass concentrations of the coal dust samples by using the blank stratum liquid and the coal dust samples.
And d, respectively measuring the turbidity values of the standard colorimetric liquids with different mass concentrations.
And e, acquiring a mathematical relation between the mass concentration and the turbidity value of the coal powder according to the turbidity values of the standard colorimetric liquids with different mass concentrations.
And f, obtaining a production liquid from the coal-bed gas well to be monitored as a monitoring sample, measuring the turbidity value of the monitoring sample, and substituting the turbidity value of the monitoring sample into the mathematical relational expression so as to calculate the mass concentration of the monitoring sample.
Specifically, in the step a, the physical property parameters of the coal rock sample preferably include: coal rock density.
Specifically, preferably, the physical property parameters of the coal rock sample further include: coal rock hardness, coal rock brittleness and coal rock glossiness.
Specifically, in the step b, the mesh number of the coal powder sample is preferably 100-250 meshes.
Specifically, in the step b, the mesh number of the coal powder sample is preferably 170-250 meshes.
Specifically, in the step c, preferably, the blank formation fluid and the pulverized coal sample are prepared into 12 to 80 standard colorimetric liquids with different mass concentrations of the pulverized coal sample.
The mass concentration of the coal dust sample in the standard colorimetric solution is 0.1-8%.
Specifically, in the step c, preferably, the blank formation fluid and the pulverized coal sample are prepared into 30 standard colorimetric liquids with different mass concentrations of the pulverized coal sample.
The mass concentration of the pulverized coal samples in 30 standard colorimetric liquids is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, respectively.
Specifically, preferably, in the step c, the coal powder sample and the blank formation liquid are prepared into the standard colorimetric solution by means of magnetic stirring or ultrasonic stirring.
Specifically, preferably, the turbidity values of the standard colorimetric solution and the monitoring sample are measured by a turbidity meter.
Specifically, in the step e, preferably, the mathematical relationship is:
y＝ax+b
wherein y is a turbidity value in NTU; x is the mass concentration of the coal powder; a is a conversion coefficient and the unit is NTU; b is the adjustment coefficient in NTU.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
in the method for monitoring the content of the coal dust in the output liquid of the coal-bed gas well, in the process of monitoring the content of the coal dust in the output liquid of the coal-bed gas well, firstly, coal rock samples with various physical parameters are obtained in a target area, the coal rock samples consistent with the physical parameters of the coal dust in the output liquid of the coal-bed gas well to be monitored are taken as samples to be tested, then the samples to be tested are ground into coal dust samples, then, the coal dust samples and blank stratum liquid are prepared into standard colorimetric liquids and turbidity values of the standard colorimetric liquids are tested, wherein the turbidity value is measured in a short time, the obtaining efficiency of the content of the coal dust samples can be improved, then, a corresponding mathematical relational expression is established according to the relation between the mass concentration of the coal dust and the turbidity values, then, the turbidity value of the samples to be monitored is obtained and substituted into the mathematical relational expression, and the mass, namely the mass concentration of the coal powder in the output liquid of the coal bed gas well to be monitored. The method can accurately and efficiently acquire the content of the coal dust in the output liquid of the coal-bed gas well by measuring the turbidity value of the output liquid of the coal-bed gas well, can rapidly acquire the mass concentration of the coal dust in the output liquid of the coal-bed gas well to be monitored in different time periods, and is simple, short in time consumption and convenient to popularize and use.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for monitoring the content of coal fines in the produced fluids of a gas well according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a method for monitoring the content of coal dust in output liquid of a coal bed gas well, which comprises the following steps of:
And 102, determining a coal rock sample consistent with the physical parameters of the coal powder in the output liquid of the coal bed gas well to be monitored from the coal rock sample as a sample to be detected, and grinding the sample to be detected into a coal powder sample.
And step 104, respectively measuring turbidity values of a plurality of standard colorimetric liquids with different mass concentrations.
And 105, acquiring a mathematical relation between the mass concentration and the turbidity value of the coal dust according to the turbidity values of the plurality of standard colorimetric liquids with different mass concentrations.
And 106, acquiring a production liquid from the coal-bed gas well to be monitored as a monitoring sample, measuring the turbidity value of the monitoring sample, and substituting the turbidity value of the monitoring sample into the mathematical relation so as to calculate the mass concentration of the monitoring sample.
In the method for monitoring the content of the coal dust in the output liquid of the coal-bed gas well, provided by the embodiment of the invention, in the process of monitoring the content of the coal dust in the output liquid of the coal-bed gas well, firstly, coal rock samples with various physical property parameters are obtained in a target area, and taking a coal rock sample consistent with the physical parameters of the coal dust in the output liquid of the coal bed gas well to be monitored as a sample to be tested, then grinding the sample to be tested into a coal dust sample, preparing the coal dust sample and the blank stratum fluid into standard colorimetric liquids, testing the turbidity values of the standard colorimetric liquids, wherein, the turbidity value measuring time is short, the efficiency of obtaining the content of the coal dust sample can be improved, then a corresponding mathematical relation is established according to the relation between the mass concentration of the coal dust and the turbidity value, and then the turbidity value of the sample to be monitored is obtained, and substituting the mass concentration of the coal-bed gas well output liquid into the mathematical relational expression to calculate the mass concentration of the monitoring sample, namely the mass concentration of the coal powder in the coal-bed gas well output liquid to be monitored. The method can accurately and efficiently acquire the content of the coal dust in the output liquid of the coal-bed gas well by measuring the turbidity value of the output liquid of the coal-bed gas well, can rapidly acquire the mass concentration of the coal dust in the output liquid of the coal-bed gas well to be monitored in different time periods, and is simple, short in time consumption and convenient to popularize and use.
Specifically, in step 101, coal and rock samples of various physical parameters are acquired in a target area, so as to select a coal and rock sample consistent with the physical parameters of coal dust in the output fluid of the coal-bed gas well to be monitored, and the target area refers to the area of the coal-bed gas well to be monitored or an area near the area of the coal-bed gas well to be monitored.
The physical property parameters of the coal rock sample comprise: coal rock density. Different types of coal rocks have different densities, the corresponding coal rock types can be determined by determining the density of the coal rocks, and the coal rock types can be classified into high-order coal (the relative density is 1.4-1.8), medium-order coal (the relative density is 1.3-1.4), low-order coal (the relative density is 1.2-1.3) and the like according to the size range of the obtained relative density of the coal rocks. The method in the standard GB/T217-1996 coal density determination method or the standard GB/T6949-2010 coal apparent relative density determination method can be adopted to determine the density of the coal petrography, and further determine the type of the coal petrography.
Preferably, in order to determine the coal rock type more accurately, in addition to measuring the density of the coal rock, other physical parameters of the coal rock can be measured, and specifically, the physical parameters of the coal rock sample can be as follows: coal rock hardness, coal rock brittleness and coal rock glossiness. The type of the coal rock can be more accurately determined according to the hardness, brittleness and glossiness of the coal rock. The hardness of the coal rock can be determined by a scratch hardness method or a microhardness method by the skilled person, the brittleness of the coal rock can be determined by a compressive strength method or a crushing strength method, the glossiness of the coal rock can be distinguished by the skilled person, and the type of the coal rock can be more accurately determined by combining at least one of the physical property parameters with the density of the coal rock.
The coal rock type can be determined by judging the physical parameters of the coal rocks, a plurality of coal rock samples can be selected in a target area, the coal rock type can be judged according to the corresponding physical parameters, so that the coal rock samples consistent with the physical parameters of the coal dust in the output liquid of the coal bed gas well to be monitored can be selected, the coal rock samples can be used as samples to be detected, and the standard colorimetric solution which is the same as the type of the coal dust in the output liquid of the coal bed gas well to be monitored can be prepared in the later period. In addition, before the coal-bed gas well is mined, the coal rock of the coal-bed gas well area to be mined can be directly obtained, so that the content of the coal dust in the output liquid of the coal-bed gas well can be monitored in the later period.
The type of the coal powder can be judged by a person skilled in the art according to the physical parameters of the coal powder in the output liquid of the coal bed gas well to be monitored, and the density, brittleness and glossiness of the coal powder can be judged by the method for judging the corresponding physical parameters of the coal rocks.
Specifically, in step 102, a coal rock sample consistent with physical parameters of coal dust in the output fluid of the coal-bed gas well to be monitored is determined from the coal rock sample to be used as a sample to be detected, and the sample to be detected is ground into a coal dust sample, so that the coal dust sample prepared in the later period is uniformly suspended in a blank stratum fluid to be used as a standard colorimetric solution. By enabling the physical property parameters of the coal in the coal rock sample to be consistent with the physical property parameters of the coal powder in the monitoring coal bed gas well output liquid, the standard colorimetric solution prepared by the coal rock sample can be ensured to be more accurate as a colorimetric standard.
The sample to be tested is ground into a coal dust sample, and the mesh number of the coal dust sample is 100-250 meshes, for example, the mesh number of the coal dust sample can be 100 meshes, 120 meshes, 140 meshes, 160 meshes, 180 meshes, 200 meshes, 220 meshes, 240 meshes, 250 meshes, and the like. The experience of a person skilled in the art indicates that the mesh number of the coal dust in the output liquid of the coal-bed gas well is usually 100-250 meshes, so that the method provided by the embodiment of the invention grinds the sample to be detected into the coal dust sample with 100-250 meshes, which can ensure that the mesh number of the coal dust sample is consistent with that of the coal dust in the output liquid of the coal-bed gas well to be monitored, so as to reduce the measurement error in the later period, and the mesh number of the coal dust sample is defined as above, so that the coal dust can be distributed more uniformly in the blank formation liquid, and the measurement accuracy of the turbidity can be improved.
Preferably, the mesh number of the coal powder sample is 170-250 meshes. As the coal dust in the output liquid is generated by the vibration or the fracture of the coal bed, the granularity of the coal dust is smaller, and the mesh number of the coal dust sample is set in the range, the mesh number of the coal dust sample is closer to that of the coal dust in the output liquid, so that the accuracy of obtaining the content of the coal dust in the output liquid of the coal bed gas well by the method provided by the embodiment of the invention is better.
In addition, the sample to be detected can be ground into a range with larger or smaller mesh number according to the mesh number of the coal dust in the specific coal-bed gas well output liquid to be monitored so as to be consistent with the mesh number of the coal dust in the actual coal-bed gas well output liquid, and the accuracy of the method provided by the embodiment of the invention is further improved.
Specifically, in step 103, the blank formation fluid and the coal powder sample are prepared into 12 to 80 standard colorimetric liquids with different mass concentrations of the coal powder sample, and the mass concentration of the coal powder sample in the standard colorimetric liquids is 0.1 to 8 percent. For example, the number of the standard colorimetric liquids may be 12, 16, 20, 24, 28, 30, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, etc., and the mass concentration of the pulverized coal sample in the standard colorimetric liquids may be in the range of 0.1% to 3%, 0.1% to 4%, 0.1% to 5%, 0.1% to 6%, 0.1% to 7%, 0.1% to 8%, 0.2% to 3%, 0.2% to 4%, 0.2% to 5%, 0.3% to 3%, 0.3% to 4%, 0.3% to 5%, etc. The mass concentration of the coal dust sample in the standard colorimetric solution is set to be within the range of 0.1-8%, so that the chroma comparison standard range of the standard colorimetric solution is finer, and the accuracy of monitoring the content of the coal dust in the output liquid of the coal bed gas well by the method provided by the embodiment of the invention is improved.
Specifically, the mass concentration difference of the pulverized coal samples in a set of standard colorimetric liquids may be set to 0.05% to 1%, for example, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc. For example, when the mass concentration difference of the pulverized coal samples in different standard colorimetric liquids is 0.1%, a set of standard colorimetric liquids having the mass concentrations of the pulverized coal samples shown as follows may be set: 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%. The smaller the mass concentration difference of the coal dust sample in the standard colorimetric solution is, the better the accuracy of the method for monitoring the content of the coal dust in the output liquid of the coal-bed gas well provided by the embodiment of the invention is, but the smaller the mass concentration difference of the coal dust sample in the standard colorimetric solution is, the quantity of the prepared standard colorimetric solution can be increased, and the labor intensity is increased. Preferably, the mass concentration difference of the pulverized coal samples in a group of standard colorimetric liquids is 0.1% -0.5%, and thus the method provided by the embodiment of the invention has better measurement accuracy and low labor intensity.
Preferably, in step 103, the blank formation fluid and the coal powder sample are prepared into 30 standard colorimetric fluids with different mass concentrations of the coal powder sample, and the mass concentrations of the coal powder samples in the 30 standard colorimetric fluids are 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, and 3.0%, respectively. The number of the standard colorimetric liquids and the mass concentration of the pulverized coal samples are set in such a way, so that the measurement accuracy of the method provided by the embodiment of the invention can be ensured.
In more detail, in step 103, the coal powder sample and the blank formation fluid are prepared into a standard colorimetric solution by magnetic stirring or ultrasonic stirring. The coal powder sample can be uniformly suspended in the blank stratum fluid by means of magnetic stirring or ultrasonic stirring, the phenomenon that the coal powder is aggregated into blocks does not exist, and accurate and stable turbidity values of the standard colorimetric solution can be conveniently obtained in the later period.
It will be understood by those skilled in the art that turbidity, which means that when suspended particles exist in a water body, light is prevented from penetrating through a water layer, that is, part of light passing through the water body is absorbed or scattered by the suspended particles, and the degree of obstruction caused by the suspended particles to light can be expressed by a turbidity value. Wherein the turbidity value can be measured by a colorimeter, a spectrophotometer, a turbidimeter, or the like. Preferably, the turbidity values of the standard colorimetric solution and the monitor sample are measured by a turbidity meter, and when the turbidity is measured by the turbidity meter, it is preferable to improve the measurement accuracy of the turbidity by keeping the system to be measured in a homogeneous state by a stirring method or an ultrasonic method. The turbidity value is indirectly reflected by the amount of suspended particles, so that the relation between the turbidity and the content of coal dust in the coal-bed gas well output liquid can be established for the coal-bed gas well output liquid.
Specifically, in step 105, the mathematical relationship between the turbidity value of the standard colorimetric solution and the mass concentration of the pulverized coal is as follows:
y＝ax+b
wherein y is a turbidity value in NTU; x is the mass concentration of the coal powder; a is a conversion coefficient and the unit is NTU; b is the adjustment coefficient in NTU.
Wherein, as will be understood by those skilled in the art, NTU means 0.13mg SiO present in 1L water2The degree of light blockage of the overall system, in the present example, NTU is only a turbidity unit as known in the art. The content of the coal dust in the sample to be monitored can be obtained by determining a mathematical relation between the turbidity value and the mass concentration of the coal dust and then under the condition that the turbidity value of the sample to be monitored is known.
Specifically, in step 106, the turbidity value of the sample to be monitored is measured by the turbidity meter, and the turbidity value is substituted into the mathematical relation, so as to calculate the content of the coal dust in the sample to be monitored. By testing the turbidity values of a plurality of samples to be monitored in different time periods, the corresponding coal dust content can be obtained, and the production state of the coal bed gas well can be further analyzed.
In more detail, when the turbidity value of the monitoring sample is tested, the suspension state of the coal powder in the monitoring sample can be the same as the suspension state of the coal powder sample in the standard colorimetric solution by means of magnetic stirring or ultrasonic stirring, so that the monitoring precision of the method provided by the embodiment of the invention is ensured.
The present invention will be further described below by way of specific examples.
In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer. The raw materials are conventional products which can be obtained commercially by manufacturers and specifications.
Example 1
In the embodiment, a summer shop block in the south of the Qin basin is taken as a target area, and the content of coal dust in the output liquid of the coal-bed gas well in the target area is monitored, wherein the specific method comprises the following steps:
step 1, obtaining coal rock samples with various physical parameters in a target area, wherein the coal rock samples comprise high-rank coal, medium-rank coal and low-rank coal.
And 2, determining that the two kinds of coal are high-order coal by testing the coal rock sample and the density of the coal dust in the coal bed gas well output liquid, and grinding the high-order coal rock into a 150-mesh coal dust sample.
And 3, obtaining blank stratum fluid without coal dust in the target area, and preparing 30 standard colorimetric fluids with the mass concentrations of the blank stratum fluid and the coal dust samples being 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9% and 3.0% respectively.
And 4, respectively testing the turbidity values of the standard colorimetric liquids by using a turbidity meter.
And 5, establishing a mathematical relation between the turbidity value of the standard colorimetric solution and the mass concentration of the corresponding coal powder sample, wherein the mathematical relation is as follows:
y＝72.242x+13.862
wherein y is a turbidity value in NTU; x is the mass concentration of the coal powder; 72.242 is conversion coefficient with unit of NTU; 13.862 is the adjustment factor in NTU.
And 6, obtaining a produced liquid from the coal-bed gas well to be monitored as a sample to be monitored, testing the turbidity value of the sample to be monitored by using a turbidity meter, substituting the turbidity value into the mathematical relational expression in the step 5, and calculating to obtain the content of the coal dust in the produced liquid of the coal-bed gas well to be monitored.
Repeating the steps, obtaining the content of the coal dust in the output liquid of the coal bed gas well to be monitored every 30min, and obtaining 9 groups of data in total, wherein the specific data are shown in table 1:
TABLE 1
Comparative example 1
In this embodiment, the content of coal dust in the output fluid of the coal-bed gas well in the summer shop block in the south of the water-logging basin is tested by using the method provided by the prior art, and the output fluid of the coal-bed gas well aimed at each test is consistent with the output fluid of the coal-bed gas well aimed at in embodiment 1 (that is, the output fluid of the coal-bed gas well to be monitored, which is obtained for the first time in embodiment 1, is consistent, and the same goes on in the following steps). Specifically, the output liquid of the coal bed gas well to be monitored is obtained every 30min, then the obtained liquid is stood, sediment is filtered, dried and weighed, the mass ratio of the coal powder to the corresponding output liquid of the coal bed gas well is calculated, the content of the coal powder in the output liquid of the coal bed gas well to be monitored is obtained, and the specific data are shown in table 2:
TABLE 2
Example 2
In the embodiment, a zheng district in the south of the waterfront basin is taken as a target area, and the content of coal dust in the output liquid of the coal bed gas well in the target area is monitored, the specific method is substantially the same as that provided by the embodiment 1, and the difference is as follows: grinding high-order coal petrography into 180-mesh coal powder samples in step 2, preparing blank stratum fluid and the coal powder samples into 20 standard colorimetric liquids with the mass concentrations of the coal powder samples of 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, 3.2%, 3.4%, 3.6%, 3.8% and 4.0% in step 3, wherein the mathematical relation in step 5 is as follows: y 72.261x + 12.362.
Repeating the steps, obtaining the content of the coal dust in the output liquid of the coal bed gas well to be monitored every 30min, and obtaining 9 groups of data in total, wherein the specific data are shown in a table 3:
TABLE 3
Comparative example 2
This example is the same as that provided in comparative example 1, except that: taking the Zhenzhuang block in the south of the Qinqi basin as a target area, and keeping the output liquid of the coal-bed gas well aimed by each test consistent with the output liquid of the coal-bed gas well aimed by the embodiment 2 (namely, the output liquid of the coal-bed gas well to be monitored, which is obtained for the first time in the embodiment 2, is consistent with the output liquid of the coal-bed gas well to be monitored for the first time, and the like in the following steps). Specific data are shown in table 4:
TABLE 4
Example 3
In this embodiment, a south fan village block of a water basin is used as a target area, and the content of coal dust in the output fluid of a coal-bed gas well in the target area is monitored, the specific method is substantially the same as that provided in embodiment 1, except that: grinding high-order coal petrography into 200-mesh coal powder samples in step 2, preparing blank stratum fluid and coal powder samples into 20 standard colorimetric liquids with the mass concentrations of the coal powder samples of 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2.0%, 2.2%, 2.4%, 2.6%, 2.8%, 3.0%, 3.3%, 3.6%, 3.8% and 4.0% in step 3, wherein the mathematical relation in step 5 is as follows: 72.442x +13.952
Repeating the steps, obtaining the content of the coal dust in the output liquid of the coal bed gas well to be monitored every 30min, and obtaining 9 groups of data in total, wherein the specific data are shown in a table 5:
TABLE 5
Comparative example 3
This example is the same as that provided in comparative example 1, except that: taking the south fan village block of the Qin basin as a target area, the output liquid of the coal-bed gas well aimed at each test is consistent with the output liquid of the coal-bed gas well aimed at in the embodiment 3 (namely the output liquid of the coal-bed gas well to be monitored, which is obtained for the first time in the embodiment 3, is consistent, and the following steps are repeated), and the specific data are shown in table 6:
TABLE 6
Application example 1
In the embodiment, the accuracy of the method provided by the embodiment of the invention is evaluated by comparing the relative error and the average relative error of the content of the coal dust in the output liquid of the coal-bed gas well to be monitored, which are obtained in the embodiments 1 to 3 and the corresponding comparative embodiments 1 to 3.
The relative error formula between the content of the coal dust in the output liquid of the coal-bed gas well to be monitored, which is obtained by the method provided by the embodiment, and the content of the coal dust in the output liquid of the coal-bed gas well to be monitored, which is obtained by the method provided by the corresponding comparative embodiment, is as follows:
further, a plurality of relative errors obtained in the plurality of times of obtaining processes are averaged by the following formula to obtain an average error:
wherein E isjThe relative error formula between the two coal dust contents obtained by the embodiment and the comparative embodiment is shown; pjJ is the test times, j is 1, 2, and j is the content of the coal dust in the output fluid of the coal bed gas well obtained by the method provided by the embodiment.9；PojThe content of coal dust in the produced fluid of the coal bed gas well obtained by the method provided by the comparative example is oj, wherein oj is 1, 2.. 9;
obtaining an average value of a plurality of relative errors obtained for a plurality of times, namely an average error; and N is the number of times of acquiring the content of the coal dust in the output fluid of the coal bed gas well by the method provided by the embodiment or the comparative embodiment, and is 1, 2, 3, … … and 9.
Substituting the content of the coal dust in the output liquid of the coal bed gas well to be monitored obtained in the examples 1 to 3 and the corresponding comparative examples 1 to 3 into the formula to obtain the relative error and the average relative error between the two, wherein the specific numerical values are shown in the following table 7:
TABLE 7
As can be seen from table 7, the relative error of the content of the coal dust in the coal-bed gas well output fluid obtained in examples 1 to 3 and corresponding comparative examples 1 to 3 and the average relative error are within 5%, and it can be seen that the method for monitoring the content of the coal dust in the coal-bed gas well output fluid provided by the embodiment of the present invention has high accuracy.
Application example 2
In the embodiment, the applicability of the method provided by the invention is evaluated by comparing the time consumption of the content of the coal dust in the output liquid of the coal-bed gas well to be monitored, which is obtained in the embodiments 1 to 3 and the comparative embodiments 1 to 3, and the specific detection time is shown in the following table 8:
TABLE 8
As can be seen from table 8, the time taken to monitor the content of coal fines in the production fluids of the coal-bed gas wells using the methods provided in examples 1-3 is much less than the time taken to monitor the content of coal fines in the production fluids of the coal-bed gas wells using the corresponding methods provided in comparative examples 1-3. Therefore, the method provided by the embodiment of the invention has the characteristics of short time consumption and convenience for popularization and use.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for monitoring the content of coal dust in the output liquid of a coal bed gas well is characterized by comprising the following steps:
step a, obtaining coal rock samples with various physical property parameters in a target area;
b, determining a coal rock sample which is consistent with the physical parameters of the coal powder in the output liquid of the coal bed gas well to be monitored from the coal rock sample as a sample to be detected, and grinding the sample to be detected into a coal powder sample;
step c, obtaining blank stratum liquid without coal dust in the target area, and preparing the blank stratum liquid and the coal dust samples into 12-80 standard colorimetric liquids with different mass concentrations of the coal dust samples, wherein the mass concentration of the coal dust samples in the standard colorimetric liquids is 0.1-8%, and the mass concentration difference of the coal dust samples of two adjacent standard colorimetric liquids in one group of the standard colorimetric liquids is 0.1-0.5%;
d, respectively measuring turbidity values of a plurality of standard colorimetric liquids with different mass concentrations;
step e, acquiring a mathematical relation between the mass concentration and turbidity value of the pulverized coal according to turbidity values of a plurality of standard colorimetric liquids with different mass concentrations;
and f, obtaining a production liquid from the coal-bed gas well to be monitored as a monitoring sample, measuring the turbidity value of the monitoring sample, and substituting the turbidity value of the monitoring sample into the mathematical relational expression so as to calculate the mass concentration of the monitoring sample.
2. The method according to claim 1, wherein in the step a, the physical property parameters of the coal rock sample comprise: coal rock density.
3. The method of claim 2, wherein the physical parameters of the coal rock sample further comprise: coal rock hardness, coal rock brittleness and coal rock glossiness.
4. The method according to claim 1, wherein in the step b, the mesh number of the coal dust sample is 100-250 meshes.
5. The method according to claim 4, wherein in the step b, the mesh number of the coal dust sample is 170-250 meshes.
6. The method according to claim 1, wherein in the step c, the blank formation fluid and the pulverized coal sample are prepared into 30 standard colorimetric liquids with different mass concentrations of the pulverized coal sample;
the mass concentration of the pulverized coal samples in 30 standard colorimetric liquids is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, respectively.
7. The method according to claim 1, wherein in the step c, the coal dust sample and the blank formation fluid are prepared into the standard colorimetric solution by means of magnetic stirring or ultrasonic stirring.
8. The method according to claim 1, wherein the turbidity values of the standard colorimetric solution and the monitoring sample are measured by a turbidity meter.
9. The method according to claim 1, wherein in step e, the mathematical relationship is:
y＝ax+b
wherein y is a turbidity value in NTU; x is the mass concentration of the coal powder; a is a conversion coefficient and the unit is NTU; b is the adjustment coefficient in NTU.
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