CN101122226A - Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas - Google Patents
Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas Download PDFInfo
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- CN101122226A CN101122226A CNA200710139353XA CN200710139353A CN101122226A CN 101122226 A CN101122226 A CN 101122226A CN A200710139353X A CNA200710139353X A CN A200710139353XA CN 200710139353 A CN200710139353 A CN 200710139353A CN 101122226 A CN101122226 A CN 101122226A
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Abstract
An oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas relates to a mineral exploitation method. The high-temperature overheating water steam convection heating is used by the prior art to exploit oil and gas of an oil shale. As the temperature capacitance coefficient of the high temperature overheating water steam is low, heating of a mineral layer is slow, which increases the cost and reduces the efficiency. Some oil shale deposits are in the desert, and much water is needed by the overheating water steam heating, so the deposits cannot be exploited. The invention uses the hydrocarbon gas as the convection heating fluid. The high temperature hydrocarbon gas is injected into the oil shale along a heat injection well, and the heated mineral layer causes pyrogenation of the kerogen to form oil and gas, which is carried by the low-temperature gas or water along a production well to the ground. After the oil and gas is separated from the water, gas will be separated independently to from the oil and gas product, and the hydrocarbon gas will enter a storage tank to be pressurized and heated to the designed pressure and temperature. Then the hydrocarbon gas will be injected into the oil shale mineral layer for circulating exploitation of oil and gas. Thus, the oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas is economical and more convenient for application in the industry.
Description
Technical field
The present invention relates to the exploitation method of produce hydrocarbons from subterranean oil shale layer (containing kerogen), more particularly, relate to a kind of multi-well fracture that utilizes, adopt overheated high temperature pressure hydrocarbon gas, with convection type heating oil shale layer, make the method for kerogen thermal decomposition exploitation oil gas.
Background technology
In state-owned very abundant oil shale resources, up to the present, the method exploitation of the oil shale of minute quantity by open-air or pit mining raw ore only arranged, produce wherein oil gas by the chemical plant destructive distillation then; Also have most oil shale raw ore to be directly used in generating and burning.
1992, Dutch Shell Internationale Research Maatschappij B.V, the patent of invention of having applied for " oil production method of heating oil shale " (CN 1016001B) in Patent Office of the People's Republic of China.This invention causes the cost height, and very easily breaks down owing to adopt Electric heating; Because the rock stratum coefficient of heat conduction is low,, cause simultaneously along a large amount of dissipated heats in the ore bed end, top so the process of heating is very slow.The oil-air pressure that pyrolysis produces in the oil shale is lower, and oil shale thermal expansion in the heating process in addition causes the oil shale crack of breaking closed easily, causes the oil gas rate of extraction in the oil shale lower.
CN1676870A discloses " method of the Convective Heating oil shale for exploiting oil gas " patent of invention by Institutes Of Technology Of Taiyuan's application, this application heats the oil shale ore bed by hyperthermia and superheating steam to flow transmission, producing oil shale oil gas is though overcome the shortcoming of above-mentioned prior art.But still there is following shortcoming in hyperthermia and superheating steam as the Convective Heating fluid: 1. the heat absorption capacity coefficient of overheated steam is low, causes ore bed heating slowly, cycling often, loss strengthens with idle work, cost increases, benefit decline.2. since some oil shale mine berth in the desert or the Gobi desert of arid serious water shortage, overheated steam heating water supply volume is bigger, cause this method to implement, or the cost of water is too high, and makes the business economic benefit very little.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art producing oil gas method from oil shale, a kind of method of high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas is provided, it is improvements over the prior art, thereby make the method for Convective Heating producing oil shale oil gas more economical, more convenient commercial Application.
The present invention is achieved through the following technical solutions its purpose:
A kind of method of high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, the steps include: at first at ground configuration, construction group wells, drilling well enters oil shale ore bed processing layer section, adopt group wells pressure break mode, produce the huge crack that is communicated with 9 mouthfuls of drilling wells at least along the ore bed spreading direction, interior all wells of group wells are communicated with along oil shale layer, select heat injection well and producing well then at interval by turns.High temperature hydrocarbon gas is injected the oil shale layer heating along the heat injection well, forms oil gas after making the kerogen thermal decomposition in the oil shale layer, by cryogenic gas carry oil gas from lines of producing wells to ground.
Described high temperature hydrocarbon gas is injected oil shale layer along the heat injection well, high temperature hydrocarbon gas be temperature between 400～700 ℃, pressure equals or a little more than the high-temperature gas of the selfweight stress sum of superstratum and oil shale layer top board.
Described cryogenic gas carry oil gas from lines of producing wells to ground, be to be discharged to ground from row's mode by fluid pressure.
Described high temperature hydrocarbon gas is meant hydrocarbon gas that methane, ethane, propane, butane are single and their mist.
The present invention compared with prior art has the following advantages and beneficial effect:
1, the cost of exploitation oil gas is low.Because the heat absorption capacity coefficient of hydrocarbon gas is 1.6 times of overheated steam, replace the steam heating with hydrocarbon gas, the factory of then same scale, can produce 40% shale oil every year more, for being designed to 1,000,000 tons shale oil factory, the then annual shale oil that can produce 400,000 tons then can increase by 1,000,000,000 yuan of the output values every year more, increases by 700,000,000 yuan of profits taxes.In addition, but a large amount of hydrocarbon gas of output in the oil shale recovery, can be directly as the Convective Heating fluid, thus the contradiction of oil shale Convective Heating water alleviated greatly, and also the exploitation for areas of serious oil shales such as desert and Gobi desert provides a great convenience.As certain oil shale mine berth in the Gobi desert, desert, nearest water supply ground is apart from 300km, if lay special-purpose supply line, need 200,000,000 yuans of investments, the cost of ton water is 50 yuan/ton, 5 tons of one ton of shale oil water consumptions of every production, and then ton shale oil cost increases by 250 yuan, build 1,000,000 tons of shale oil factories, have a net increase of 2.5 hundred million yuan of costs every year.If use hydrocarbon gas heating exploitation instead, only one of water can increase by 2.5 hundred million yuan of profits taxes.
As can be seen, improvement of the present invention is very remarkable to the economic benefit that enterprise brings, and the effect that obtains has exceeded the imagination of people's expections.
2, be convenient to commercial Application.Invention utilizes the method for multi-well fracture, after being communicated with group wells, inject the high temperature hydrocarbon gas of elevated pressures along the heat injection well, make the ore bed Convective Heating, kerogen pyrolysis in the oil shale forms oil gas, utilize steam to heat the shortcoming of oil shale layer thereby overcome prior art, make its scope of application and practical condition wider.
Description of drawings
Fig. 1 is the present invention's floor map that group wells is arranged under single ore bed condition;
Fig. 2 is the present invention implements exploitation under single ore bed condition a schematic diagram;
Fig. 3 is the present invention's floor map that group wells is arranged under ore bed group condition;
Fig. 4 is the present invention implements exploitation under ore bed group condition a schematic diagram.
Among the figure: 1 expression heat injection well; 2 expression producing wells; 3 expression oil shale ore beds; 4 expression oil shale top boards; The non-oil shale formation on 5 expression oil shale ore bed tops; 6 expression well cementing materials; 7 expression sleeve pipes; 8 expression floral tubes; 9 expression oil shale layer base plates; The non-oil shale of 10 expressions rock stratum.
The specific embodiment
Embodiment 1:
As Fig. 1, shown in 2, a kind of method of high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, at a thickness is 30m, in the single oil shale ore bed of the nearly level of buried depth 100m, adopt the present invention to arrange 9 mouthfuls of wells, well spacing 100m, being square net distributes, each drilling well is positioned on the intersection point of square net, and each drilling well is drilled in the ore bed 3, is lowered to sleeve pipe 7 then, internal diameter 150mm is connected with the top of floral tube 8.
Convective Heating gas among the embodiment also can adopt independent methane, ethane or propane gas.
Concrete steps are as follows:
1) by the design and construction drilling well, after wellbore construction is finished, select the 5# well to do fractured well, 1,2,3,4,6,7,8, the 9# well does the target well, water is implemented fracturing by the 5# well and is communicated with the target well, by regulating and closing the target well that is communicated with and make 9 mouthfuls of wells whiles or connection in succession.
2) at first select the 5# well to do heat injection well 1, close all the other 8 mouthfuls of wells, implantation temperature is 400 ℃ a methane gas, its pressure is higher than the vertical stress on stratum, and pyrolysis oil shale is after several hours, and water and oil gas temperature that producing well 2 rows are produced are lower than 100 ℃, be sustainable row's produce oil gas, carry out on ground oil and gas and water from, carry out the separation of hydrocarbon gas then, the non-methane hydrocarbon gas of separation input hydrocarbon gas storage tank.The methane gas that separates enters the methane gas storage tank.
3) the gases at high pressure pump is compressed to 5.0MPa with methane gas, enters high temperature methane gas heating furnace.Inject ore bed along the 5# well after being heated to 400 ℃.So circulation gets final product the oil gas of extraction oil shale layer.
4) in the operation later stage, after the producing well temperature is higher than 200 ℃, can rotate heat injection well and producing well.Continue exploitation.Repeating above step gets final product.
Embodiment 2:
As Fig. 1, shown in 2, a kind of method of high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, at a thickness is 30m, in the single oil shale ore bed of the nearly level of buried depth 100m, adopt the present invention to arrange 9 mouthfuls of wells, well spacing 100m, being square net distributes, each drilling well is positioned on the intersection point of square net, and each drilling well is drilled in the ore bed 3, is lowered to sleeve pipe 7 then, internal diameter 150mm is connected with the top of floral tube 8.
Concrete steps are as follows:
1) by the design and construction drilling well, after wellbore construction is finished, select the 5# well to do fractured well, 1,2,3,4,6,7,8, the 9# well does the target well, water is implemented fracturing by the 5# well and is communicated with the target well, by regulating and closing the target well that is communicated with and make 9 mouthfuls of wells whiles or connection in succession.
2) at first select the 5# well to do heat injection well 1, close all the other 8 mouthfuls of wells, implantation temperature is 700 ℃ a propane gas, its pressure is higher than the vertical stress on stratum, and pyrolysis oil shale is after several hours, and water and oil gas temperature that producing well 2 rows are produced are lower than 100 ℃, be sustainable row's produce oil gas, carry out on ground oil and gas and water from, carry out the separation of hydrocarbon gas then, the non-propane hydrocarbon gas input hydrocarbon gas storage tank of separation.The propane gas of separating enters the propane flammable gas storage tank.
3) the gases at high pressure pump is compressed to 5.0MPa with propane gas, enters high temperature propane gas heating furnace.Inject ore bed along the 5# well after being heated to 700 ℃.So circulation gets final product the oil gas of extraction oil shale layer.
4) in the operation later stage, after the producing well temperature is higher than 200 ℃, can rotate heat injection well and producing well.Continue exploitation.Repeating above step gets final product.
Embodiment 3:
As Fig. 3, shown in 4, a kind of method of high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, certain oil shale ore bed group contains three layers of oil shale ore bed 3, its oil shale layer thickness is respectively 10m, 25m, 8m from bottom to top, intermediate course is a sandstone, and thickness is respectively 3m and 4m, this ore bed group cumulative thickness 43m, ore-bearing coefficient 86%, adopt the equilateral triangle well spacing, the well spacing is selected 50m, arranges 11 mouthfuls of wells.
With the method drilling well of embodiment 1, each well is drilled in the ore bed 3, is lowered to sleeve pipe and floral tube then.Can implement exploitation.
Concrete steps are as follows:
1) by the design and construction drilling well, after wellbore construction is finished, select the 6# well to do fractured well, 1,2,3,4,5,7,8,9,10, the 11# well does the target well, water is implemented fracturing by the 6# well and is communicated with the target well, by regulating and closing the target well that is communicated with and make 11 mouthfuls of wells whiles or connection in succession.
2) at first select the 6# well to do heat injection well 1, close all the other 10 mouthfuls of wells, implantation temperature is 550 ℃ overheated first, second, the hydrocarbon gas that propane mixes, its pressure is higher than the vertical stress on stratum, pyrolysis oil shale is after several hours, and water and oil gas temperature that producing well 2 rows are produced are lower than 100 ℃, promptly sustainable row's produce oil gas, in surface separation, the hydrocarbon gas that first, the second of separation, propane mix enters independent storage tank.
3) the gases at high pressure pump is compressed to 5.0MPa with the hydrocarbon gas that first, second, propane mix, and enters the hydrocarbon gas heating furnace of high temperature first, second, propane mixing.Inject ore bed along the 5# well after being heated to 550 ℃.So circulation gets final product the oil gas of extraction oil shale layer.
4) in the operation later stage, after the producing well temperature is higher than 200 ℃, can rotate heat injection well and producing well.Continue exploitation.Repeating above step gets final product.
From embodiment 3 as seen and since therebetween some non-oil shale rock stratum 10, heat these rock stratum and can cause some unnecessary heats to dissipate, but the existence of interlayer makes and is easy between the recovery well be communicated with, this also is the advantage of ore bed group exploitation.
Obviously, those skilled in the art can change and is out of shape the present invention, if these changes and distortion do not break away from principle of the present invention and scope, promptly belong within the scope of claim of the present invention and equivalent technology thereof, then the present invention also comprises these changes and is out of shape interior.
Claims (3)
1. the method for a high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, at first at the ground configuration group wells, drilling well enters oil shale ore bed (3), adopt group wells pressure break mode, produce the huge crack that is communicated with 9 mouthfuls of drilling wells at least along the ore bed spreading direction, interior all drilling wells of group wells are communicated with along oil shale layer, select heat injection well (1) and producing well (2) then at interval by turns, high-temperature gas is injected the oil shale layer heating along heat injection well (1), form oil gas after making the kerogen thermal decomposition in the oil shale layer, carry oil gas by cryogenic gas and drain into ground from producing well (2), it is characterized in that: described high-temperature gas is a high temperature hydrocarbon gas.
2. according to the method for the described high temperature hydrocarbon gas Convective Heating of claim 1 oil shale for exploiting oil gas, it is characterized in that: described high temperature hydrocarbon gas is meant hydrocarbon gas that methane, ethane, propane, butane are single and their mist.
3. according to the method for claim 1 or 2 described high temperature hydrocarbon gas Convective Heating oil shale for exploiting oil gas, it is characterized in that: described high temperature hydrocarbon gas injects the oil shale ore bed after being heated to 400～700 ℃ of temperature.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418679B (en) * | 2008-11-12 | 2012-01-25 | 太原理工大学 | Method for pumping coalbed gas by heating coal bed |
| CN102465691A (en) * | 2010-11-10 | 2012-05-23 | 中国石油天然气股份有限公司 | Oil shale in-place destructive distillation mining method and simulated experiment system thereof |
| CN104145078A (en) * | 2011-11-16 | 2014-11-12 | 佛瑞德·施耐德 | Method for initiating circulation for steam-assisted gravity drainage |
| CN105971575A (en) * | 2016-05-17 | 2016-09-28 | 大同煤矿集团有限责任公司 | Method for in-situ heat-injection spaced-slicing oil and gas exploitation of super-thick oil shale ore bed |
| CN106285597A (en) * | 2015-05-27 | 2017-01-04 | 中国石油化工股份有限公司 | Oil shale in-situ oil production method |
| CN106285596A (en) * | 2015-05-27 | 2017-01-04 | 中国石油化工股份有限公司 | Oil shale in-situ oil production method |
| CN107345480A (en) * | 2016-05-04 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of method of heating oil shale reservoir |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN112984849A (en) * | 2021-03-22 | 2021-06-18 | 太原理工大学 | Cold and military system karst heat storage and metamorphic rock stratum fracture type heat storage geothermal development method |
| CN112983370A (en) * | 2021-02-10 | 2021-06-18 | 中国石油大学(北京) | Method for extracting oil shale by electrically heating and electrically heating coupling catalyst between same well seams of horizontal well |
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2007
- 2007-09-06 CN CNA200710139353XA patent/CN101122226A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418679B (en) * | 2008-11-12 | 2012-01-25 | 太原理工大学 | Method for pumping coalbed gas by heating coal bed |
| CN102465691A (en) * | 2010-11-10 | 2012-05-23 | 中国石油天然气股份有限公司 | Oil shale in-place destructive distillation mining method and simulated experiment system thereof |
| CN102465691B (en) * | 2010-11-10 | 2015-06-03 | 中国石油天然气股份有限公司 | Oil shale in-place destructive distillation mining method and simulated experiment system thereof |
| CN104145078A (en) * | 2011-11-16 | 2014-11-12 | 佛瑞德·施耐德 | Method for initiating circulation for steam-assisted gravity drainage |
| CN106285597A (en) * | 2015-05-27 | 2017-01-04 | 中国石油化工股份有限公司 | Oil shale in-situ oil production method |
| CN106285596A (en) * | 2015-05-27 | 2017-01-04 | 中国石油化工股份有限公司 | Oil shale in-situ oil production method |
| CN106285597B (en) * | 2015-05-27 | 2019-06-18 | 中国石油化工股份有限公司 | Oil shale in-situ oil production method |
| CN107345480A (en) * | 2016-05-04 | 2017-11-14 | 中国石油化工股份有限公司 | A kind of method of heating oil shale reservoir |
| CN105971575A (en) * | 2016-05-17 | 2016-09-28 | 大同煤矿集团有限责任公司 | Method for in-situ heat-injection spaced-slicing oil and gas exploitation of super-thick oil shale ore bed |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN112983370A (en) * | 2021-02-10 | 2021-06-18 | 中国石油大学(北京) | Method for extracting oil shale by electrically heating and electrically heating coupling catalyst between same well seams of horizontal well |
| CN112984849A (en) * | 2021-03-22 | 2021-06-18 | 太原理工大学 | Cold and military system karst heat storage and metamorphic rock stratum fracture type heat storage geothermal development method |
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