CN115012891A - In-situ oil shale extraction method based on domino effect - Google Patents
In-situ oil shale extraction method based on domino effect Download PDFInfo
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- 239000004058 oil shale Substances 0.000 title claims abstract description 144
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 230000000694 effects Effects 0.000 title claims abstract description 18
- 238000000605 extraction Methods 0.000 title claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 112
- 238000000197 pyrolysis Methods 0.000 claims abstract description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000005065 mining Methods 0.000 claims abstract description 24
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 18
- 239000003079 shale oil Substances 0.000 claims description 18
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 230000005012 migration Effects 0.000 claims description 5
- 238000013508 migration Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 19
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- 230000008569 process Effects 0.000 description 17
- 238000002411 thermogravimetry Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
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- 238000001938 differential scanning calorimetry curve Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000004580 weight loss Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000113 differential scanning calorimetry Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Abstract
The invention discloses an in-situ oil shale exploitation method based on domino effect, wherein an oil shale exploitation well is arranged in an oil shale mining area; establishing oil and gas channels between the production wells; pyrolyzing oil shale in the PART area with high temperature oxygen-free gas; oil and gas extraction; oil and gas are not produced in the PART area; injecting oxygen-containing gas into the pyrolyzed PART region without producing oil and gas in the PART region, oxidizing the residual high-temperature combustible substances in the PART region to generate high-temperature gas, and allowing the high-temperature gas to enter and pyrolyze the next PART region and the oil shale; oil and gas extraction; the content of carbon dioxide gas in the high-temperature gas is more than 0, and the high-temperature gas is realized by controlling the injection amount of oxygen-containing gas; repeating the steps, and sequentially exploiting the oil shale in the following PART areas. The length of the pyrolysis zone will show a trend of increasing in turn, thereby realizing 'domino effect' of the staged self-pyrolysis of the oil shale.
Description
Technical Field
The invention belongs to the technical field of oil shale exploitation, and particularly relates to an in-situ oil shale exploitation method based on a domino effect.
Background
Organic matters in an oil shale reservoir are subjected to in-situ conversion and mining, which is also called as an underground carbonization process, namely underground oil shale is directly subjected to carbonization, so that oil gas is directly led out to the ground from the underground through a production well. The heating method is mainly classified into conduction heating (electric heating, combustion heating), fluid convection heating, and radiation heating.
The ICP technology of Shell company is the most typical technology of the current technology adopting an electric heating mode, the technology adopts a vertical drilling method, an electric heater is placed in an oil shale ore layer through a drill hole, the oil shale layer is heated by utilizing the heat conduction effect, kerogen in oil shale is converted into high-quality oil and gas products, and then the oil and gas products are pumped to the ground by utilizing a traditional oil extraction method.
The fluid convection heating technology is as follows: the method comprises the steps of firstly arranging a plurality of vertical shafts on the ground, drilling the well group into an oil shale ore layer to be mined, fracturing the oil shale ore layer by using the well group, enabling giant cracks extending along the horizontal direction to appear on the oil shale ore layer to be mined, enabling all well holes of the well group at the position of the oil shale ore layer to be communicated, then alternately using production wells and heat injection wells at intervals, injecting hot gas with the temperature of 400-700 ℃ into the fractured oil shale ore layer along the heat injection wells, fully heating the oil shale ore layer, and pyrolyzing kerogen in the oil shale ore layer to form oil gas which is discharged to the ground from the production wells.
The research related to the pyrolysis of the oil shale in the laboratory stage is relatively mature at present, but the oil shale cannot enter the industrial production stage in time, and one important reason is that the economic benefit is difficult to generate. Particularly, the oil shale resource in China is buried relatively deeply, the oil shale layer is relatively thin, and the oil content is relatively low. In-situ extraction of oil shale requires injection of a large amount of heat into the oil shale layer to bring the underground oil shale layer to its pyrolysis temperature for pyrolysis to produce shale oil and gas. The investment and the output are high, so that the economic benefit is difficult to generate after the oil shale is exploited in situ and enters an industrial production stage. Therefore, how to reduce the cost becomes a key problem for the oil shale to enter the industrial production stage.
After the oil shale is subjected to underground dry distillation, organic matters are pyrolyzed, volatile products escape, the residual parts in the reservoir are mainly solid semicoke and coke, and the heat remained in the stratum after the oil shale is mined in situ, shale oil remained in the reservoir and products of all stages of pyrolysis are fully utilized. After the oil shale is produced in situ (i.e., the production well no longer produces shale oil), a large amount of heat remains in the formation and if not utilized, the heat is slowly lost to the surrounding formation until it disappears. And although the production well no longer produces shale oil, there remains a residual fraction of shale oil that has not been produced in the reservoir and products from various stages of pyrolysis, such as: kerogen, heavy oil, light oil, solid semicoke and coke. These substances release a large amount of heat after oxidation.
Disclosure of Invention
The invention aims to reduce the cost of oil shale in-situ exploitation and provides an in-situ exploitation oil shale method based on a domino effect.
The method for exploiting the oil shale in situ based on the domino effect comprises the following steps:
1) arranging an oil shale mining well in an oil shale mining area; establishing oil and gas channels between the production wells;
2) pyrolyzing oil shale in the PART area with high temperature oxygen-free gas; oil and gas extraction; oil and gas are not produced in the PART area;
3) injecting oxygen-containing gas into the pyrolyzed PART region without producing oil and gas in the PART region, oxidizing the residual high-temperature combustible substances in the PART region to generate high-temperature gas, and allowing the high-temperature gas to enter and pyrolyze the next PART region and the oil shale; oil and gas extraction;
the content of carbon dioxide gas in the high-temperature gas is more than 0, and the high-temperature gas is realized by controlling the injection amount of oxygen-containing gas;
4) repeating the step 3), and sequentially mining the oil shale in the following PART areas;
the step 1) is that oil shale series-connection mining well groups are arranged in an oil shale mining area; establishing oil and gas channels between the production wells;
the step 2) is to open the well heads of the No. 1 well and the No. 2 well, close other well heads, inject high-temperature oxygen-free gas into the oil shale layer through the No. 1 well, the high-temperature oxygen-free gas heats the oil shale in the PARTI area, so that the oil shale is pyrolyzed to generate shale oil, and the shale oil is produced by the No. 2 well;
the step 3) is that no oil or gas is produced from the No. 2 well; closing the No. 2 well mouth, and simultaneously opening the No. 3 well mouth; injecting oxygen-containing gas into the No. 1 well; the PARTI region becomes the PARTI oxidation region, the PARTII region oil shale becomes the PARTII pyrolysis region, and the # 3 well is produced;
the 3# well does not produce oil and gas any more, the pyrolysis of oil shale in the PARTII area is completed, the well heads of the 1# well and the 3# well are closed, the well heads of the 2# well and the 4# well are opened simultaneously, and oxygen-containing gas is injected through the 2# well; pyrolysis of oil shale in Partiii zone, well 4# yield;
repeating the step 3), and sequentially mining the oil shale in the following areas through conversion of a pyrolysis area and an oxidation area in a PARTII area;
the wellhead of the No. 2 well is provided with a dynamic online gas component tester, and a sensor of the tester needs to be lowered into an oil-gas migration channel between the No. 1 well and the No. 3 well;
the sensor is a carbon monoxide, carbon dioxide and/or hydrocarbon gas sensor.
In the oil-gas migration channel between the 1# well and the 3# well, the content of carbon monoxide in the high-temperature gas generated in the step 3) is greater than zero; the content of carbon monoxide is controlled by controlling the content and/or flux of oxygen-containing gas; when the temperature of the generated high-temperature gas does not reach the pyrolysis temperature of the oil shale, the content of carbon monoxide is controlled to be close to zero, and the carbon monoxide is oxidized to generate heat as much as possible; when the pyrolysis temperature of the oil shale is reached, the content of the carbon monoxide is not controlled to be the upper limit, and the carbon monoxide and the produced combustible gas are recovered together.
The invention provides an in-situ oil shale exploitation method based on domino effect, wherein an oil shale exploitation well is arranged in an oil shale mining area; establishing an oil-gas channel between the exploitation wells, dividing an oil shale mining area into a plurality of areas, and introducing high-temperature oxygen-free gas to pyrolyze oil shale in the PART area; oil and gas production; oil and gas are not produced in the PART area; injecting oxygen-containing gas into the pyrolyzed PART region without producing oil and gas in the PART region, oxidizing the residual high-temperature combustible substances in the PART region to generate high-temperature gas, and allowing the high-temperature gas to enter and pyrolyze the next PART region and the oil shale; oil and gas extraction; the content of carbon dioxide gas in the high-temperature gas is more than 0, and the high-temperature gas is realized by controlling the injection amount of oxygen-containing gas; repeating the steps to sequentially exploit the oil shale in the following PART area; the heat is supplied from the outside when the oil shale in the first area is pyrolyzed, and the heat required by the pyrolysis of the oil shale in the remaining area is supplied by the oxidation reaction of solid coke generated after the pyrolysis of the oil shale in the previous area to generate a large amount of heat. The length of the pyrolysis zone will show a trend of increasing in turn, thereby realizing 'domino effect' of the staged self-pyrolysis of the oil shale. The shale oil in-situ exploitation method reduces the shale oil in-situ exploitation cost by utilizing the two parts of heat.
Drawings
FIG. 1 is a graph of TG and DSC in the pyrolysis of oil shale and the formation of carbocoal oxidation by pyrolysis;
FIG. 2 is a schematic diagram of a quincunx well group;
FIG. 3 is a schematic diagram of a series well group.
Detailed Description
Example 1 weight loss analysis of oil shale by nitrogen pyrolysis and air pyrolysis
And arranging oil shale mining wells in the oil shale mining area, and sampling and analyzing the oil shale stratum of the mining area in the well drilling process to carry out industrial analysis and thermogravimetric analysis. The industrial analysis method refers to the national standard GB/T212-2008, and the fixed carbon content data of the target oil shale area can be obtained through industrial analysis (the industrial analysis can be sent to a professional organization for testing). And thermogravimetric analysis can be performed in the laboratory.
The thermogravimetric analysis procedure is as follows:
1) and simultaneously acquiring thermogravimetric and Differential Scanning Calorimetry (DSC) data in the process of the thermal weight loss of the oil shale by adopting a Thermogravimetric (TG) and Differential Scanning Calorimetry (DSC) synchronous analyzer. Thermogravimetric analysis of oil shale samples and solid residues a STA 449F3 synchronous thermal analyzer was used. Al special for experimental container adopting thermogravimetry 2 O 3 The crucible is calcined for 2 hours at the high temperature of 1000 ℃ in a muffle furnace before use so as to reduce the influence of other impurity components in the crucible on the thermogravimetric experiment result;
2) weighing 20mg of oil shale sample, and making the sample according to ASTM D2013-07/D4749-87 (2012) and GB 474- & 2008 standard. Putting in special Al for thermogravimetry 2 O 3 In a crucible;
3) thermogravimetric analyzer procedure: firstly, heating an oil shale sample from normal temperature in a nitrogen atmosphere for 10 ℃ min −1 Heating the sample to 800 ℃, thermogravimetry of the processAnd obtaining thermal weight loss and heat absorption and release data of the oil shale sample in the pyrolysis process by using a differential scanning calorimetry curve; secondly, stopping heating, simultaneously converting into air atmosphere, and automatically cooling to room temperature. Thermogravimetry and differential scanning calorimetry curves in the process can obtain thermal weight loss and heat absorption and desorption data of the residual semicoke (fixed carbon) in the oxidation process after the pyrolysis of the oil shale sample is finished. The experiment was repeated 3 times to ensure the reliability of the results. The results of the experiment are shown in FIG. 1.
The TG curve in fig. 1 represents the reduction in weight of the oil shale sample during heating. The DSC curve is a change process of heat absorption or heat release in the oil shale weight loss process, wherein the DSC curve of a 35-55 minute section in the heating process in the nitrogen atmosphere in the first stage fluctuates upwards to show that the stage is the process of heat absorption, namely the oil shale pyrolysis in the stage needs the external heat supply, the peak area is obtained to show the absorbed heat value, the calculation result is 1.2MJ/kg, and the physical significance is as follows: the pyrolysis process of the oil shale is an endothermic process, and 1.2MJ of heat is required to be supplied to the outside every time 1kg of the oil shale is pyrolyzed; after the second stage atmosphere is converted into the air atmosphere, the DSC curve fluctuates downwards in 80-85 minutes, which shows that the second stage is the process of releasing heat, namely the oxidation in the stage is the process of outputting heat to the outside, the value of the peak area which shows the released heat is obtained, the calculation result is 2.04MJ/kg, and the physical meaning is as follows: after the pyrolysis of the oil shale is completed, the oxidation process of the remaining semicoke (fixed carbon) is an exothermic process, and 2.04MJ heat can be output to the outside after every 1kg of the semicoke (fixed carbon) left by the pyrolysis of the oil shale is oxidized. Therefore, the heat release (2.04 MJ/kg) of the carbon-containing semicoke generated by pyrolyzing the oil shale is larger than the heat (1.2 MJ/kg) required by pyrolyzing the oil shale.
Example 2 in-situ oil shale extraction method based on domino effect
From the results of example 1, the length of each pyrolysis zone was calculated: assuming that the length of any one pyrolysis zone is L n The length of the adjacent latter pyrolysis zone is L n+1 According to the experimental results of example 1, 1.2MJ of heat is externally supplied for every pyrolysis of 1kg of oil shale, and fixed carbon remaining from the pyrolysis of 1kg of oil shale is oxidizedThen, 2.04MJ heat can be output to the outside, and the general formula can be calculated as follows: l is n+1 =L n X 1.7. The length of the oil shale furnace tends to increase gradually, so that the domino effect of staged self-thermal cracking of the oil shale is realized.
1) Arranging an oil shale mining well in the oil shale mining area according to the calculation result;
2) well position layouts of different forms (including but not limited to quincunx well groups, series well groups and the like) can be adopted according to actual needs;
3) 1) the oil shale production well to the bottom of an oil shale layer;
4) performing reservoir transformation on an oil shale layer between oil shale production wells, wherein the reservoir transformation comprises but is not limited to methods such as hydraulic fracturing and horizontal wells, and establishing an oil-gas channel between a gas injection well and a production well;
5) closing the well heads of the 3-5# wells, opening the well heads of the 1# well and the 2# well, and injecting high-temperature oxygen-free gas into the oil shale layer through the 1# well;
6) the method of injecting high temperature oxygen-free gas into the oil shale formation through the gas injection well in item 5) includes, but is not limited to: injecting high-temperature gas directly from the ground, and burning the high-temperature gas by a downhole burner;
7) the high temperature oxygen-free gas described in clause 5) includes, but is not limited to: gases such as nitrogen and carbon dioxide;
8) the high-temperature oxygen-free gas heats the oil shale in the PARTI area, so that the oil shale is pyrolyzed to generate shale oil and is produced by the No. 2 well until no shale oil and gas are produced in the No. 2 well, namely: the gas produced from the No. 2 well head is basically the same as the gas injected from the No. 1 well in composition and content, and the required time is recorded as t 1 ；
9) After pyrolysis of oil shale in the PARTI area is completed, a 2# well mouth is closed, a dynamic online gas component tester is installed at the 2# well mouth, a gas sample is taken from the 2# well mouth in real time to perform dynamic testing, the content of CO in gas is monitored and recorded as m, a temperature sensor is installed at the 2# well mouth, a thermocouple of the temperature sensor needs to be lowered into an oil and gas migration channel between the 1# well and the 3# well, and the 2# well bottom temperature is monitored in real time and recorded as T. Simultaneously opening the well mouth of the No. 3 well, and injecting normal-temperature oxygen-containing gas into the well through the No. 1 well;
10) 9) the pyrolysis of the oil shale is completed by taking the standard that no shale oil and gas are produced in the No. 2 well;
11) the oxygen-containing gas in item 9) having an oxygen content of x. x may obtain the initial value according to the following:
according to the fixed carbon content (obtained by industrial analysis) in the oil shale mining area and the thermogravimetric and differential scanning calorimetry experiment result data of the embodiment 1, the heat data required by the oil shale pyrolysis in each area in the target oil shale mining area, the oxygen amount required by the oxidation of the residual semicoke (fixed carbon) after the oil shale pyrolysis is finished and the heat release data are obtained. During the oxidation of semicoke (fixed carbon), the following three reactions mainly take place:
C+O 2 =CO 2 （1）
2C+O 2 =2CO （2）
2CO+O 2 =2CO 2 （3）
according to equation (1), 1 mole of oxygen is required for complete oxidation of 1 mole of carbon to produce 1 mole of carbon dioxide, and the oxygen consumption per 12g of fixed carbon is 22.4L, that is, the unit oxygen consumption of fixed carbon is 1.87L/g, which can be obtained from the molar mass of carbon and the gas molar volume of oxygen.
According to equation (2), 2 moles of carbon require 1 mole of oxygen for incomplete oxidation to produce 2 moles of carbon monoxide, which can be derived from the molar mass of carbon and the gas molar volume of oxygen: if the oxygen content is less than 0.93L/g, CO will be produced, and if the oxygen content is between 0.93 and 1.87L/g, the products are CO and CO 2 A mixture of (a).
According to equation (3), 2 moles of carbon monoxide require 1 mole of oxygen for complete oxidation to produce 2 moles of carbon dioxide, which indicates that the subsequent introduction of oxygen will also undergo oxidation reaction with the previously produced carbon dioxide while oxidizing the fixed carbon. Carbon monoxide is therefore only produced in the case of inadequate oxygen. That is to say: as long as carbon monoxide is present, it is ensured that no oxygen is present in the gas.
And if the thickness of the oil shale layer in the target oil shale stratum is a meters, the length of the I area is b meters, and the width is c meters, the total amount of the oil shale in the target area is abc cubic meters, and the test density of the oil shale is as follows: ρ kilograms per cubic meter, the total amount of oil shale in the target zone is abc ρ kilograms. According to the industrial analysis result, the mass percentage of the oil shale fixed carbon is as follows: w, the content of semicoke (fixed carbon) remaining after pyrolysis of the oil shale in the region I is obtained as abc ρ W kg. The amount of oxygen required to oxidize the semicoke in zone I was calculated to be 1.87abc ρ W cubic meters based on the unit oxygen consumption of 1.87L/g of semicoke (fixed carbon). The time t required for pyrolysis to be completed from the PARTI region 1 To initially calculate the initial value of x: 1.87abc ρ W/t 1 Cubic meters per hour.
12) The oxygen injected in the process can generate oxidation reaction with solid semicoke and coke generated after the pyrolysis of the oil shale in the PARTI area at high temperature, and generate a large amount of heat which can be brought into the PARTII area to heat the shale oil in the area, so that the shale oil is pyrolyzed to generate shale oil and is output from a No. 3 well;
13) in the process of item 12), the oxygen content x of the injected gas needs to be adjusted in real time according to the CO content m measured by the online gas composition tester monitoring the gas sample taken from the wellhead of the # 2 well and the bottom hole temperature T monitored by the temperature sensor. The oxygen content x of the injected gas is controlled to ensure that the content m of CO in a gas sample taken from the wellhead of the No. 2 well is greater than 0. Also throughout the heating process, the oxygen content x of the injected gas can be adjusted according to the following table.
14) After pyrolysis of the oil shale in the PARTII area is finished, closing the well mouth of the No. 1 well, simultaneously opening the well mouth of the No. 4 well, and injecting normal-temperature oxygen-containing gas into the well through the No. 2 well;
15) 13) the pyrolysis of the oil shale is completed by taking the standard that no shale oil and gas are produced in a No. 3 well;
16) repeating the steps from the 9) th item to the 15) th item until the oil shale reservoir in the oil shale mining area is completely and fully pyrolyzed;
the method can be used for various well arrangement modes, the oil shale mining area is divided into a plurality of areas, heat is provided from the outside only when the oil shale in the first area is pyrolyzed, and the heat required by the pyrolysis of the oil shale in the remaining areas is provided by the oxidation reaction of solid coke generated after the pyrolysis of the oil shale in the previous area to generate a large amount of heat. And according to the general formula: l is n+1 =L n X 1.7. The pyrolysis zone length will show a sequentially increasing trend, thereby realizing the domino effect of staged autogenous pyrolysis of oil shale.
Claims (6)
1. The in-situ oil shale extraction method based on the domino effect is characterized by comprising the following steps:
1) arranging an oil shale mining well in an oil shale mining area; establishing oil and gas channels between the production wells;
2) pyrolyzing oil shale in the PART area with high temperature oxygen-free gas; oil and gas extraction; oil and gas are not produced in the PART area;
3) injecting oxygen-containing gas into the pyrolyzed PART region without producing oil and gas in the PART region, oxidizing the residual high-temperature combustible substances in the PART region to generate high-temperature gas, and allowing the high-temperature gas to enter and pyrolyze the next PART region and the oil shale; oil and gas extraction;
4) and repeating the step 3), and sequentially exploiting the oil shale in the following PART areas.
2. The domino effect based in-situ oil shale extraction method according to claim 1, characterized by:
1) arranging oil shale series-connection mining well groups in an oil shale mining area; establishing oil and gas channels between the production wells;
2) opening the well mouths of the No. 1 well and the No. 2 well, closing other well mouths, injecting high-temperature oxygen-free gas into the oil shale layer through the No. 1 well, heating the oil shale in the PARTI area by the high-temperature oxygen-free gas, pyrolyzing the oil shale to generate shale oil, and outputting the shale oil from the No. 2 well;
3) the 2# well does not produce oil and gas any more; closing the No. 2 well mouth, and simultaneously opening the No. 3 well mouth; injecting oxygen-containing gas into the No. 1 well; the PARTI region becomes the PARTI oxidation region, the PARTII region oil shale becomes the PARTII pyrolysis region, and the # 3 well is produced;
the 3# well does not produce oil and gas any more, the pyrolysis of oil shale in the PARTII area is completed, the well heads of the 1# well and the 3# well are closed, the well heads of the 2# well and the 4# well are opened simultaneously, and oxygen-containing gas is injected through the 2# well; partiii zone oil shale pyrolysis, well # 4 production;
and repeating the step 3), and sequentially exploiting the oil shale in the following areas through conversion of the PARTII area pyrolysis area and the oxidation area.
3. The domino effect based in-situ oil shale extraction method according to claim 2, characterized by: a dynamic online gas composition tester is installed at the wellhead of the No. 2 well, and a sensor of the tester needs to be lowered into an oil-gas migration channel between the No. 1 well and the No. 3 well.
4. The domino effect based in-situ oil shale extraction method according to claim 3, characterized by: the sensor is a carbon monoxide, carbon dioxide and/or hydrocarbon gas sensor.
5. The domino effect based in-situ oil shale extraction method according to claim 4, characterized by: the oxygen-containing gas is air.
6. The multi-channel staged in situ pyrolysis oil shale mining method of claim 3, 4 or 5, characterized in that: and carbon monoxide in the oil and gas migration channel 1 is greater than zero.
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| CN202210717753.9A CN115012891B (en) | 2022-06-23 | 2022-06-23 | In-situ oil shale exploitation method based on domino effect |
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| CN115012891B CN115012891B (en) | 2024-03-22 |
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