CN107387063B - Method for detecting temperature of bottom of underground coal gasification vertical drill hole in real time - Google Patents
Method for detecting temperature of bottom of underground coal gasification vertical drill hole in real time Download PDFInfo
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- CN107387063B CN107387063B CN201710788346.6A CN201710788346A CN107387063B CN 107387063 B CN107387063 B CN 107387063B CN 201710788346 A CN201710788346 A CN 201710788346A CN 107387063 B CN107387063 B CN 107387063B
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- 238000002309 gasification Methods 0.000 title claims abstract description 48
- 239000003245 coal Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 18
- 238000011112 process operation Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 71
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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Abstract
The invention discloses a method for detecting the temperature of the bottom of a vertical gas outlet drill hole for underground coal gasification in real time, which establishes a quantitative function relation between the temperature of the bottom of the drill hole and the outlet temperature, the gas flow of a gas outlet channel and the length of the gas outlet channel through an overground simulation experiment; detecting the bottom temperature of the vertical gas outlet drill hole on site and determining a correction coefficient according to the temperature of the bottom of the gas outlet drill hole calculated by a simulation experiment; according to the field correction coefficient; determining the actual functional relationship between the bottom temperature of the on-site gas outlet drill hole and the outlet temperature, the gas flow of the gas outlet channel and the length of the gas outlet channel; the method for detecting the bottom temperature of the vertical drill hole for underground coal gasification in real time is simple and easy to implement, does not need complex equipment, and is low in cost.
Description
Technical Field
The invention relates to a temperature detection method, in particular to a method for detecting the bottom temperature of a vertical drilling hole for underground coal gasification in real time.
Background
The underground coal gasification technology is a process of directly and controllably burning coal buried underground and generating combustible gas through the thermal action and chemical action of the coal. As is known, an underground gasification furnace is composed of at least one inlet channel, one outlet channel and a gasification channel between the inlet channel and the outlet channel. The gas inlet channel is used for sending gasifying agents such as air, oxygen and the like into the coal bed, the gasifying agents react in the gasifying channel, and generated gas is conveyed out from the gas outlet channel and is further processed and utilized on the ground. Because of construction convenience and high cost performance, the air outlet channel is usually drilled vertically.
Along with the progress of gasification reaction, a reaction high-temperature area gradually moves towards the air outlet vertical drill hole from the air inlet channel, when the reaction high-temperature area approaches the bottom of the air outlet vertical drill hole, the bottom of the air outlet vertical drill hole is basically mined out, so that the change of the ground stress near the drill hole can cause the coal seam to be very easy to break, the coal gas can be easily leaked directly or underground water can be easily gushed into the gasification furnace after the break, the gasification furnace is forced to stop running, the economic loss is caused, meanwhile, the vertical drill hole is easy to shift after being expanded with heat and contracted with cold, the sealing between the drill hole and the stratum aquifer is poor, the underground water leakage and the coal gas loss are caused, the gasification process can not be safely operated, the underground water pollution can be caused, the risk of the gasification environment.
In order to obtain the temperature of the gas outlet vertical drill hole, a temperature detection element is required to be installed in the gas outlet drill hole, untreated water gas is conveyed in a gas outlet channel, the atmosphere is complex and corrosive, so that the service life of a temperature detection device installed in the gas outlet channel is very short, the temperature detection device is often surrounded by impurities in the gas, the bottom temperature of the gas outlet channel cannot be accurately obtained, and the temperature of the bottom of the gas outlet drill hole cannot be known in an actual underground coal gasification furnace.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the bottom temperature of a vertical drilling hole for underground coal gasification in real time.
The method establishes a quantitative function relation between the bottom temperature of a vertical gas outlet drill hole and the outlet temperature, the gas flow of a gas outlet channel and the length of the gas outlet channel through an overground simulation experiment; determining a correction coefficient according to the temperature of the bottom of a vertical gas outlet drill hole detected on site and the temperature of the bottom of the vertical gas outlet drill hole calculated by using the temperature of an orifice, the gas flow and the length of the drill hole; determining an actual functional relation between the bottom temperature of the on-site vertical gas outlet drill hole and the outlet temperature, the gas flow of the gas outlet channel and the length of the gas outlet channel according to the on-site correction coefficient; and calculating the bottom temperature of the vertical gas outlet drill hole on site according to the length of the gas outlet channel on site, the outlet temperature detected in real time and the gas flow of the gas outlet channel, thereby realizing the real-time detection of the bottom temperature of the vertical gas outlet drill hole. The method for detecting the temperature of the bottom of the coal underground gasification vertical drill hole is simple and easy to implement, does not need complex equipment, and is low in cost.
In order to achieve the purpose, the invention adopts the following technical means:
the invention provides a method for detecting the bottom temperature of a coal underground gasification vertical drill hole in real time, which comprises the following steps:
(a) establishing a quantitative function relation between the bottom temperature of the vertical gas outlet drill hole and the temperature of the orifice of the vertical gas outlet drill hole, the gas flow and the drill hole length through an overground simulation experiment;
(b) determining a correction coefficient according to the temperature of the bottom of a vertical gas outlet drill hole detected on site and the temperature of the bottom of the vertical gas outlet drill hole calculated by using the temperature of an orifice, the gas flow and the length of the drill hole;
(c) determining an actual functional relation between the bottom temperature of the on-site vertical gas outlet drill hole and the temperature of the orifice, the gas flow and the length of the drill hole channel according to the on-site correction coefficient;
(d) and calculating the bottom temperature of the on-site vertical gas outlet drill hole according to the on-site drill hole length, the real-time detected orifice temperature and the gas flow.
Further, the step (a) includes the steps of:
(a1) establishing an array among the bottom temperature of the vertical gas outlet drill hole, the temperature of an orifice, the gas flow and the length of the drill hole through an overground simulation experiment;
(a2) and fitting by using analysis software to obtain the quantitative functional relation between the bottom temperature of the vertical gas outlet drill hole and the orifice temperature, the gas flow and the drill hole length.
Further, the step (a1) comprises the steps of:
(a11) arranging a temperature measuring element in a plane perpendicular to the bottom of the vertical air outlet drill hole of the ground simulation experiment furnace, wherein the temperature measuring element and the gasification channel are arranged at an angle;
(a12) arranging a temperature measuring element in a plane perpendicular to an orifice of a vertical air outlet drill hole of the ground simulation experiment furnace, wherein the temperature measuring element and the gasification channel are arranged at an angle;
(a13) arranging a flow detection element between the upper surface of the ground simulation experiment furnace and the outlet of the air outlet drill hole;
(a14) in the experimental process, acquiring temperature detection values of an outlet drill hole orifice and an outlet drill hole bottom and detection values of outlet drill hole flow in real time;
(a15) and establishing an equation set between the bottom temperature of the vertical gas outlet drill hole and the temperature of the hole opening, the gas flow of the gas outlet channel and the length of the gas outlet channel by using statistical analysis software according to the temperature detection values of the hole opening and the hole bottom of the gas outlet drill hole at different times and different gas outlet flows.
Further, the step (b) comprises the steps of:
(b1) a flow detection element is arranged between the vertical air outlet drill hole orifice of the on-site underground gasification furnace and the ground;
(b2) arranging a temperature measuring element in a plane perpendicular to an orifice of a vertical air outlet drill hole of the on-site underground gasification furnace;
(b3) acquiring the temperature of the bottom of a vertical air outlet drill hole of the underground gasification furnace by using a movable temperature measuring element;
(b4) and (b) calculating the temperature of the bottom of the vertical gas outlet drill hole of the on-site underground gasification furnace by combining the quantitative function relationship between the temperature of the bottom of the vertical gas outlet drill hole and the temperature of the orifice of the vertical gas outlet drill hole, the gas flow and the drill hole length in the step (a), and determining a correction coefficient by combining the temperature of the bottom of the vertical gas outlet drill hole detected on site.
(b5) Determining the correction coefficient according to the methods of (b4) and (b 3).
Further, the bottom temperature of the vent hole in the step (a11) is the arithmetic mean value of the temperature values of the arranged temperature measuring elements.
Further, the temperature of the outlet drill hole in the step (a12) is the arithmetic mean value of the temperature values of the arranged temperature measuring elements.
The invention has the beneficial effects that:
the invention provides a method for detecting the bottom temperature of a vertical drilling hole for underground coal gasification in real time. The method realizes real-time detection of the bottom temperature of the vertical gas outlet drill hole by establishing the quantitative function relation between the bottom temperature of the vertical gas outlet drill hole and the outlet temperature, the gas flow of the gas outlet channel and the length of the gas outlet channel in the coal underground gasification reaction, and is simple and easy to implement, free of complex equipment and low in cost.
Drawings
Fig. 1 is a schematic view of the structure of a coal gasification model test furnace of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example 1: the embodiment provides a method for detecting the bottom temperature of a vertical drilling hole for underground coal gasification in real time, and as shown in fig. 1, a model gasifier is cylindrical special pressure equipment with the length of 10m and the diameter of 4m, the design pressure is 2.5MPa, and the gasifier can work for a long time at the high temperature of 1600 ℃. The hearth of the model gasification furnace is in a cuboid shape, a heat insulation layer 5 is arranged on the hearth, a coal bed 4 is paved in the hearth, a gasification channel 2 is arranged in the coal bed 4, a furnace body is provided with 1 air inlet channel 1 and 1 vertical drilling hole (air outlet channel) 3, 5 hole bottom temperatures are arranged at the bottom of the vertical drilling hole 3, and are respectively 3N1 hole bottom temperature 1, 3N2 hole bottom temperature 2, 3N3 hole bottom temperature 3, 3N4 hole bottom temperature 4 and 3N5 hole bottom temperature 5, the vertical planes of the vertical drilling holes 3 are equally divided together at the hole bottom and the gasification channel 2, namely the included angle between the two adjacent vertical planes is 60 degrees; 5 corresponding parallel hole temperatures, namely 3M1 hole temperature 1, 3M2 hole temperature 2, 3M3 hole temperature 3, 3M4 hole temperature 4 and 3M5 hole temperature 5 are also set at the hole of the vertical drilling hole 3. The temperature is set in such a way that temperature values can be obtained at the same point in different directions, and the arithmetic mean value of the temperature values is taken as a numerical value used when an equation set is established, so that the difference of temperature measurement in different directions caused by different constructions of the vertical drilling hole 3 is reduced. 31 flow detection is arranged between the furnace body and the temperature of the orifice, and front and rear straight pipe sections of the 31 flow detection meet the metering requirement, so that the value of the flow detection is free from the influence of the installation of a temperature measuring element. In the test, data obtained by flow detection of 3M1 hole temperature 1, 3M2 hole temperature 2, 3M3 hole temperature 3, 3M4 hole temperature 4, 3M5 hole temperature 5, 3N1 hole bottom temperature 1, 3N2 hole bottom temperature 2, 3N3 hole bottom temperature 3, 3N4 hole bottom temperature 4, 3N5 hole bottom temperature 5 and 31 are transmitted to an instrument display system in real time and stored.
After the coal seam 4 is paved, the gasification channel 2 is constructed, the vertical drilling hole 3 is constructed, the 3N1 hole bottom temperature is 1, the 3N2 hole bottom temperature is 2, the 3N3 hole bottom temperature is 3, the 3N4 hole bottom temperature is 4 and the 3N5 hole bottom temperature is set, and after the coal seam is sealed by cement, loess is filled and tamped; the upper part of the coal seam is covered with a sand layer. Wherein one end of the gasification channel 2 is communicated with the air inlet channel 1, and the other end is communicated with the vertical drilling hole 3.
After the gasification furnace is ignited, a gasification agent is added into the gasification furnace through the air inlet channel 1, coal in the gasification channel 2 reacts with the coal, and an instrument display system displays data obtained by detecting the flow of 3M1 hole bottom temperature 1, 3M2 hole bottom temperature 2, 3M3 hole bottom temperature 3, 3M4 hole bottom temperature 4, 3M5 hole bottom temperature 5, 3N1 hole bottom temperature 1, 3N2 hole bottom temperature 2, 3N3 hole bottom temperature 3, 3N4 hole bottom temperature 4, 3N5 hole bottom temperature 5 and 31. As the reaction proceeded, the 3N1 well bottom temperature 1, 3N2 well bottom temperature 2, 3N3 well bottom temperature 3, 3N4 well bottom temperature 4, 3N5 well bottom temperature gradually increased, with the 3M1 well bottom temperature 1, 3M2 well bottom temperature 2, 3M3 well bottom temperature 3, 3M4 well bottom temperature 4, 3M5 well bottom temperature increasing with the 3N1 well bottom temperature 1, 3N2 well bottom temperature 2, 3N3 well bottom temperature 3, 3N4 well bottom temperature 4, 3N5 well bottom temperature.
Taking one group every 5 minutes to form a plurality of groups (T hole bottom temperature, T hole opening temperature, L drilling hole length and Q gas outlet flow), and taking k groups (k is more than or equal to 4) when the process normally runs. Are respectively as
(T1 hole bottom temperature; T1 hole opening temperature; L bore length; Q1 gas flow);
(T2 hole bottom temperature; T2 hole opening temperature; L bore length; Q2 gas flow);
(T3 hole bottom temperature; T3 hole opening temperature; L bore length; Q3 gas flow);
(T4 hole bottom temperature; T4 hole opening temperature; L bore length; Q4 gas flow);
……
(Tk hole bottom temperature; Tk orifice temperature; L bore length; Qk exit gas flow).
Wherein the well bottom temperature is the arithmetic mean of 3N1 well bottom temperature 1, 3N2 well bottom temperature 2, 3N3 well bottom temperature 3, 3N4 well bottom temperature 4, 3N5 well bottom temperature 5; the orifice temperature is the arithmetic average of 3M1 orifice temperature 1, 3M2 orifice temperature 2, 3M3 orifice temperature 3, 3M4 orifice temperature 4, 3M5 orifice temperature 5; the drilling length is the distance between the bottom temperature of the vertical drilling hole 3 and the temperature of the hole opening of the above-ground experimental furnace.
Thus, using the sps analysis software (including but not limited to), a quantitative functional relationship between the bottom temperature of the hole and the temperature of the hole opening, the length of the drilled hole and the flow rate of the outlet gas can be fitted. I.e., T-hole bottom temperature ═ f (T port temperature, L bore length, Q exit gas flow), where T-hole bottom temperature, T port temperature, Q exit gas flow are hole bottom temperature, port temperature, and exit gas flow at the same time.
On an on-site coal underground gasification furnace, measuring the on-site bottom temperature of an air outlet drill hole by using a movable thermocouple to obtain the hole bottom temperature Ta at a certain moment on site; calculating the current hole bottom temperature Tb according to the on-site drilling length, the on-site orifice temperature and the on-site gas outlet flow at the moment in the process, and the T hole bottom temperature f (the T orifice temperature, the L drilling length and the Q gas outlet flow); the correction coefficient K ═ Ta/Tb in the actual environment on site can be found.
Therefore, in the actual operation of the process, the temperature of the bottom of the T hole is k f (T opening temperature, L drilling hole length and Q outlet gas flow rate), wherein the L drilling hole length is the distance from the bottom of the drilling hole to the opening temperature and is constant; the T orifice temperature and the Q outlet flow can be detected in real time, and the correction coefficient K is known, so that the bottom temperature of the outlet drill hole can be obtained in real time according to the orifice temperature, the drill hole length and the outlet flow in the actual operation of the on-site gasification furnace.
Claims (5)
1. A method for detecting the bottom temperature of a vertical drilling hole for underground coal gasification in real time is characterized by comprising the following steps:
(a) establishing a quantitative function relation between the bottom temperature of the vertical gas outlet drill hole and the temperature of the orifice of the vertical gas outlet drill hole, the gas flow and the drill hole length through an overground simulation experiment;
(b) determining a correction coefficient according to the temperature of the bottom of the vertical gas outlet drill hole detected on site and the temperature of the bottom of the vertical gas outlet drill hole calculated by using the temperature of the orifice, the gas flow and the length of the drill hole in the step (a);
(c) determining a quantitative function relation between the bottom temperature of the on-site vertical gas outlet drill hole and the temperature of the orifice, the gas flow and the length of the drill hole channel according to the on-site correction coefficient;
(d) calculating the bottom temperature of the on-site vertical gas outlet drill hole in real time according to the on-site drill hole length, the real-time detected hole opening temperature and the gas flow in the process operation;
the step (a) further comprises the steps of:
(a1) establishing a relation equation set between the bottom temperature of the vertical gas outlet drill hole and the temperature of the orifice, the gas flow and the drill hole length through an overground simulation experiment;
the step (a1) further comprises the steps of:
(a11) arranging a temperature measuring element in the same plane perpendicular to the bottom of the vertical air outlet drill hole of the ground simulation experiment furnace, wherein the temperature measuring element and the gasification channel are arranged at an angle;
(a12) arranging a temperature measuring element in the same plane perpendicular to the orifice of the vertical air outlet drill hole of the ground simulation experiment furnace, wherein the temperature measuring element and the gasification channel are arranged at an angle;
(a13) arranging a flow detection element between the upper surface of the ground simulation experiment furnace and the outlet of the air outlet drill hole;
(a14) in the experimental process, acquiring temperature detection values of an outlet drill hole orifice and an outlet drill hole bottom and detection values of outlet drill hole flow in real time;
(a15) and according to the outlet drill hole orifice temperature, the outlet drill hole bottom temperature and the outlet flow detection values at different moments, utilizing statistical analysis software to establish a quantitative function relation between the bottom temperature of the vertical outlet drill hole and the orifice temperature, the gas flow of the outlet channel and the length of the outlet channel.
2. The method for detecting the bottom temperature of the coal underground gasification vertical drill hole in real time according to claim 1, wherein the step (a) further comprises the following steps:
(a2) and obtaining the quantitative function relation between the bottom temperature of the vertical gas outlet drill hole and the temperature of the orifice, the gas flow and the length of the drill hole by using analysis software.
3. The method for detecting the bottom temperature of the coal underground gasification vertical drill hole in real time according to claim 1, wherein the step (b) comprises the following steps:
(b1) a flow detection element is arranged between the vertical air outlet drill hole orifice of the on-site underground gasification furnace and the ground;
(b2) arranging a temperature measuring element in a plane perpendicular to an orifice of a vertical air outlet drill hole of the on-site underground gasification furnace;
(b3) acquiring the temperature of the bottom of a vertical air outlet drill hole of the underground gasification furnace by using a movable temperature measuring element;
(b4) determining the calculated hole bottom temperature by combining the quantitative function relationship between the bottom temperature of the vertical gas outlet drill hole and the temperature of the orifice of the vertical gas outlet drill hole, the gas flow and the drill hole length in the step (a);
(b5) determining the correction coefficient according to the methods of (b4) and (b 3).
4. The method for detecting the bottom temperature of the coal underground gasification vertical drill hole in real time according to claim 1, wherein the bottom temperature of the gas outlet drill hole in the step (a11) is the arithmetic mean value of the temperature values of the arranged temperature measuring elements.
5. The method for detecting the bottom temperature of the coal underground gasification vertical borehole in real time according to claim 1, wherein the temperature of the outlet borehole opening in the step (a12) is the arithmetic mean of the temperature values of the arranged temperature measuring elements.
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