CN101440704B - Continuous high-energy gas fracturing permeation-increasing method capable of leaching ore layer in ground and special high-energy gas generator - Google Patents
Continuous high-energy gas fracturing permeation-increasing method capable of leaching ore layer in ground and special high-energy gas generator Download PDFInfo
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- CN101440704B CN101440704B CN2008100802420A CN200810080242A CN101440704B CN 101440704 B CN101440704 B CN 101440704B CN 2008100802420 A CN2008100802420 A CN 2008100802420A CN 200810080242 A CN200810080242 A CN 200810080242A CN 101440704 B CN101440704 B CN 101440704B
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Abstract
The invention relates to a continuous high-energy gas fracturing permeation-increasing method for an underground leachable ore bed and a special high-energy gas generator, belonging to the technical field of improving permeability of an ore-bearing rock bed. A method for increasing the pressure and permeability of ore layer by continuous high-energy gas fracturing includes such steps as delivering the high-energy gas generator to ore layer by cable, igniting the explosive bomb in the high-energy gas generator, continuously acting the high-energy gas on the ore layer, releasing pressure of ore layer, and generating fast seepage flow under the action of instantaneous hydraulic gradient to complete the pressure and permeability increase of high-energy gas. A high energy gas generator for use in the method, characterized by: the structure comprises a connecting pipe, wherein the connecting pipe is sequentially connected with a plugging device, an upper buffer, a delay igniter, an explosion bomb, a lower buffer and a tip from top to bottom. The invention can improve the permeability of the in-situ leachable ore layer, thereby improving the recovery ratio and the single yield of in-situ leaching exploitation and improving the utilization efficiency of the resource of the in-situ leachable ore layer.
Description
Technical field
But the present invention relates to a kind of ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method and specific high-energy gas generator, belong to improving and compose ore deposit formation permeability technical field.
Background technology
The underground leaching recovery process of mineral resources mainly divides 3 stages: the leaching solution of preparation is injected into ore bed through fluid injection boring; In ore bed, in the leaching solution migration process with mineral generation chemical reaction; Leachate is extracted the face of land out through drawing liquid boring.In 3 stages, can leaching solution inject ore bed and leachate, and can extract the face of land out be one of most important link, also is the basis of soaking method exploitation mineral with realizing, and what determine this important step is the infiltrative size of ore bed.Because the objective geology characteristic (mainly being that permeability is low) of part mineral products, caused the ground many conspicuous contradictions in the process of adopting that night sweat, night sweat with making and adopt cost rising, exploitation rate and recovery ratio and reduce, seriously hindered can ground the night sweat utilization in mining goods and materials source of China.Therefore, the hypotonicity of composing the rock stratum, ore deposit soaks the bottleneck that method exploitation mineral are produced smoothly with becoming restriction.
For improving the permeability of composing the rock stratum, ore deposit; The current method of in actual production, often using mainly contains following two kinds: the boring well-flushing; Measure through well-flushing reduces the boring drilling process to containing the pollution in aquifer, ore deposit; And containing the aquifer, ore deposit after in time recovering to pollute, well-flushing measure commonly used comprises that methods such as air compressor machine well-flushing, air compressor machine water pump combined washing well, foam well-flushing, sodium pyrophosphate well-flushing and piston hole flushing are cleaned boring; Except that adopting the well-flushing measure to recover the stratum permeability, also to avoid holing in the drilling process to the infiltrative influence of ore bed through improving bore process, bore process has gaslift negative pressure drilling construction technology, foam drilling construction technology etc. after the improvement commonly used.And mineral ground night sweats and adopts, the well-flushing of Cheng Jinghou and adopt improved bore process to alleviate to greatest extent or the drilling process of avoiding holing in to the pollution of ore bed, recover the permeability on stratum to a certain extent.Therefore, these two kinds of methods all can not improve the intrinsic permeability of ore bed.
The High-Energy Gas Fracturing Technology of hydrocarbon containing formation is well-known, and has been widely used for increasing the recovery ratio of hydrocarbon containing formation PetroChina Company Limited. and natural gas.These technology are to utilize the impact bullet clocklike to burn in the down-hole; Produce a large amount of high temperature and high pressure gas that surpass the maximum geostatic stress value of oil-gas Layer and act on oil-gas Layer with the pulse load mode; The formation blockage thing is pressed off; Can form many radially cracks in the near wellbore zone, improve near the percolation ability on the stratum of pit shaft.The main purpose of these methods is around drilling well, to form several to greatly enhance the crack, makes its collection channel that becomes oil or natural gas, utilizes the high flow conductivity that greatly enhances the crack, has increased the production efficiency of oil or natural gas.But the mineral resources ground process of adopting of night sweating is different with the recovery process of petroleum and natural gas, and mineral resources ground night sweats in the process of adopting; Need leaching solution in ore bed, to be uniformly distributed with migration; And fully react with the mineral in the ore bed, leachate compiles the drawing liquid hole subsequently, extracts the face of land out through the drawing liquid hole.Too small or excessive all the night sweating of the permeability of ore bed adopted with being unfavorable for; Too smallly be unfavorable for the migration of leaching solution in the rock stratum; The excessive abundant reaction that is unfavorable between leaching solution and the uranium mineral, the particularly aforementioned method of in hydrocarbon containing formation, using forms several tangible radial fissures in ore bed, make leaching solution be prone to form predominant current; Leachant is fully comprehensively dissolved soak ore, not reach the purpose of leaching.
Summary of the invention
But the technical problem that the present invention will solve provides a kind of ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method and equipment; Be applicable to mineral resources exploitations such as the uranium that can soak method exploitation, gold, copper, silver, molybdenum with adopting; Improve the permeability of composing the rock stratum, ore deposit; Night sweat with reducing and adopt cost, the recovery ratio and the single rate that night sweat and adopt with improving.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is:
But ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method is characterized in that: high-energy gas generator is delivered to cable through producing well and composed the rock stratum, ore deposit, open plugging device; Plugging device is combined closely with the production borehole wall high-energy gas generator is fixed; Ignite detonation bullet in the high-energy gas generator, high energy gas to 10 fens kind to 30 minute kinds of ore bed effect after, close plugging device; Plugging device is combined closely with the production borehole wall and is unclamped; Give the ore bed release, make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
These further improvements in methods are:
The surge pressure of high energy gas is controlled at 100MPa between the 500MPa.
Igniting of detonation bullet controlled by Time Delay Squib.
Delay time between the Time Delay Squib is 10 seconds kinds to 1 minute.
But be used for the high-energy gas generator of ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method, it is characterized in that: its structure comprises that tube connector connects plugging device, upper bumper, Time Delay Squib, detonation bullet, lower bumper, termination from top to bottom successively;
Plugging device is connected with tube connector through screw thread; Sleeve pipe and tube connector are arranged through screwed connection in the middle of upper bumper and the lower bumper, the snubber two ends are measuring body steel plate, weld with spring between steel plate; Steel plate near detonation bullet one end in upper bumper and the lower bumper is free; Other end steel plate is fixed on the sleeve pipe, and Time Delay Squib and detonation bullet have centre bore, assemble through tube connector.
The further improvement of this equipment concrete structure is:
Polyphone connects between the detonation bullet, and the number of polyphone detonation bullet is 1 to 10.
Each detonation bullet is corresponding to be provided with a Time Delay Squib.
Fill solid, liquid or solid liquid mixing attitude explosive or gunpowder in the said detonation bullet.
Operating principle of the present invention:
Delay time through being connected in series with between the Time Delay Squib between the detonation bullet is guaranteed high energy gas pressure equalizing property at interval; Increase the action time of high energy gas pressure, and grasp the surge pressure size of high energy gas through the difference that changes detonation bullet powder charge character to ore bed.These sealings, the pressure controlled amount and pressure adjustable high energy gas action time acts on the pulse load mode can be ground-dipping ore bed; Initial high energy gas presses off the ore bed obstruction; Produce the radially microfissure system that does not receive geostatic stress control in the near wellbore zone, high energy gas drives the ground water movement in producing well and the ore bed crack rapidly subsequently, produces the fluid motion field; And, further expand the perforation micro-crack at the most advanced and sophisticated stress concentration effect that produces of micro-crack.High energy gas has been raised groundwater level in the ore bed when further expanding the perforation micro-crack; When high energy gas acts on ore bed after a period of time, to the ore bed release, then the groundwater level in the ledge also can reduce suddenly thereupon through producing well; Under the hydraulic gradient effect of moment generation; High energy gas in the ledge, air-water mixture and underground water spray naturally or overflow from producing well through the quick seepage flow of rock mass hole, can from ore, take the parts of fine particulate debris out of; Dredge ledge, further increased the permeability of ledge.
The present invention has the following advantages and good effect:
The present invention utilizes high energy gas to act on behind the ore bed certain hour the ore bed release; Groundwater level in the ledge also can be reduced suddenly thereupon, and under the hydraulic gradient effect of moment generation, the high energy gas in the ledge, air-water mixture and underground water are through the quick seepage flow of rock mass hole; Naturally spray or overflow from producing well; Can from ore, take the parts of fine particulate debris out of, dredge ledge, further increase the permeability of ledge.The present invention can improve can be ground-dipping ore bed permeability, and then improved recovery ratio and the single rate that exploitation is leached in the original place, improved can ground-dipping ore bed efficiency of resource.
The Time Delay Squib that adopts delay time to be spaced apart 10 seconds to 1 minute makes the detonation of detonation bullet elementary errors; Increased high energy gas pressure action time, guaranteed the high energy gas pressure equalizing, made that ore bed anatonosis scope is big, the anatonosis amplitude is high; The anatonosis effect is even, avoids occurring greatly enhancing the crack.
The actual conditions of soaking the production demand according to ore bed lithology and ground confirm that the number of polyphone detonation bullet is the kind of institute's powder charge in 1 to 10 and the definite detonation bullet, grasps the surge pressure size of high energy gas according to the difference of detonation bullet powder charge character.
Tube connector also plays the effect of protection cable except connecting each parts effect of high-energy gas generator.
The setting of plugging device can prevent that high energy gas from unloading outward and cause energy loss, forces it most ofly to get into purpose ore bed deep, thereby improved the treatment effect of this technology greatly, reduced high energy gas simultaneously to the ground-dipping ore bed destruction of covering layer up and down.
Through installing snubber, effectively solved the damage that fierce impact caused of high energy gas to plugging device.
Through installing snubber and lower bumper, effectively alleviated the fierce impact of high energy gas to covering layer and lower shoe rock stratum on the tax rock stratum, ore deposit, protected last covering layer and lower shoe rock stratum.
Description of drawings
But Fig. 1 is the specific high-energy gas generator structural representation of ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method.
Wherein: 1, cable, 2, producing well, 3, high-energy gas generator, 31, tube connector, 32, plugging device, 33, upper bumper, 34, Time Delay Squib, 35, the detonation bullet, 36, lower bumper, 37, the termination.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is explained further details:
Can ground-dipping ore bed sandstone permeability be 10
-6D; Sandstone compressive strength is 200MPa; The continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Through plugging device 32 and the producing well fixedly high-energy gas generator 3 of combining closely, through the Time Delay Squib 34 detonation bullet 35 that ignites.High-energy gas generator 3 10 detonation bullets 35 of polyphone and 10 Time Delay Squibs 34; In the 1st the detonation bullet is solid explosive, is solid gunpowder in all the other 9 detonation bullets, and the delay time of Time Delay Squib 34 is 1 minute; High energy gas surge pressure size is 500MPa in the control producing well; High energy gas after 30 minutes action time, is closed plugging device to ore bed, gives the ore bed release; Make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
Can ground-dipping ore bed sandstone permeability be 10
-4D; Sandstone compressive strength is 160MPa; Continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Through plugging device 32 and the producing well fixedly high-energy gas generator 3 of combining closely, through the Time Delay Squib 34 detonation bullet 35 that ignites.High-energy gas generator 36 detonation bullets 35 of polyphone and 6 Time Delay Squibs 34; In the 1st the detonation bullet is solid explosive, is solid gunpowder in all the other 5 detonation bullets, and the delay time of Time Delay Squib 34 is 40 seconds; High energy gas surge pressure size is 400MPa in the control producing well; High energy gas after 25 minutes action time, is closed plugging device to ore bed, gives the ore bed release; Make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
Can ground-dipping ore bed sandstone permeability be 10
-3D; Sandstone compressive strength is 130MPa; Continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Through plugging device 32 and the producing well fixedly high-energy gas generator 3 of combining closely, through the Time Delay Squib 34 detonation bullet 35 that ignites.In high-energy gas generator 34 detonation bullets 35 of polyphone and 34,4 detonation bullets of 4 Time Delay Squibs is liquid gun propellant, and the delay time of Time Delay Squib 34 is 20 seconds; High energy gas surge pressure size is 300MPa in the control producing well; High energy gas after 20 minutes action time, is closed plugging device to ore bed, gives the ore bed release; Make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
Embodiment 4
Can ground-dipping ore bed sandstone permeability be 10
-2D; Sandstone compressive strength is 90MPa; Continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Through plugging device 32 and the producing well fixedly high-energy gas generator 3 of combining closely, through the Time Delay Squib 34 detonation bullet 35 that ignites.In high-energy gas generator 33 detonation bullets 35 of polyphone and 34,3 detonation bullets of 3 Time Delay Squibs is liquid gun propellant, and the delay time of Time Delay Squib 34 is 10 seconds; High energy gas surge pressure size is 200MPa in the control producing well; High energy gas after 15 minutes action time, is closed plugging device to ore bed, gives the ore bed release; Make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
Embodiment 5
Can ground-dipping ore bed sandstone permeability be 10
-1D; Sandstone compressive strength is 60MPa; Continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Through plugging device and the producing well fixedly high-energy gas generator 3 of combining closely, through the Time Delay Squib 34 detonation bullet 35 that ignites.High-energy gas generator 31 detonation bullet 35 of polyphone and 1 Time Delay Squib 34; In 1 detonation bullet be liquid gun propellant, and the interior high energy gas surge pressure size of control producing well is 100MPa, and high energy gas is to ore bed after 10 minutes action time; Close plugging device; Give the ore bed release, make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
In sum; But the ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method implementation process is: through producing well 2 usefulness cables 1 high-energy gas generator 3 is delivered to and composed the rock stratum, ore deposit; Open plugging device 32; Plugging device with produce and wall is combined closely and made high-energy gas generator 3 fixing, through the Time Delay Squib 34 detonation bullet 35 that ignites, the delay time of Time Delay Squib 34 is 10 seconds kinds to 1 minute; The high energy gas that produces to 10 fens kind to 30 minute kinds of ore bed effect after; Close plugging device 32, give the ore bed release, make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
But the equipment that is used for ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method is a kind of high-energy gas generator 3; Its structure comprises that tube connector 31 connects plugging device 32, upper bumper 33, Time Delay Squib 34, detonation bullet 35, lower bumper 36, termination 37 from top to bottom successively.
Polyphone connects between the detonation bullet, and the number of polyphone detonation bullet is 1 to 10.
A Time Delay Squib 34 is corresponding with a detonation bullet 35, and adopting Time Delay Squib 34 purposes is increase high energy gas pressure action time, guarantees the high energy gas pressure equalizing.
The purpose of plugging device 32 is to prevent that high energy gas from unloading outward to cause energy loss, reduces high energy gas to the ground-dipping ore bed destruction of covering layer up and down.
The purpose of upper bumper 33 is to prevent that plugging device 32 from receiving the high energy gas effect and damage.
The purpose of upper bumper 33 and lower bumper 36 is alleviates high energy gas to composing the fierce impact of covering layer and lower shoe rock stratum on the rock stratum, ore deposit, has protected last covering layer and lower shoe rock stratum.
Claims (8)
1. but ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method is characterized in that: high-energy gas generator is delivered to cable through producing well and composed the rock stratum, ore deposit, open plugging device; Plugging device is combined closely with the production borehole wall high-energy gas generator is fixed; Ignite detonation bullet in the high-energy gas generator, high energy gas to 10 fens kind to 30 minute kinds of ore bed effect after, close plugging device; Plugging device is combined closely with the production borehole wall and is unclamped; Give the ore bed release, make high energy gas, air-water mixture and underground water in the ore bed under the hydraulic gradient effect of moment generation, form quick seepage flow, accomplish continuous high-energy gas fracturing seepage increasing.
2. but ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method according to claim 1 is characterized in that: the surge pressure of high energy gas is controlled at 100MPa between the 500MPa.
3. but ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method according to claim 1 is characterized in that: igniting of said detonation bullet controlled by Time Delay Squib.
4. but ground-dipping ore bed continuous high-energy gas fracturing seepage increasing method according to claim 3 is characterized in that: the delay time between the said Time Delay Squib is 10 seconds to 1 minute.
5. but be used for high-energy gas generator according to claim 1,2,3 or 4 described ground-dipping ore bed continuous high-energy gas fracturing seepage increasing methods; It is characterized in that: its structure comprises that tube connector connects plugging device, upper bumper, Time Delay Squib, detonation bullet, lower bumper, termination from top to bottom successively; Plugging device is connected with tube connector through screw thread; Sleeve pipe and tube connector are arranged through screwed connection in the middle of upper bumper and the lower bumper, the snubber two ends are measuring body steel plate, weld with spring between steel plate; Steel plate near detonation bullet one end in upper bumper and the lower bumper is free; Other end steel plate is fixed on the sleeve pipe, and Time Delay Squib and detonation bullet have centre bore, assemble through tube connector.
6. high-energy gas generator according to claim 5 is characterized in that: polyphone connects between the detonation bullet, and the number of polyphone detonation bullet is 1 to 10.
7. high-energy gas generator according to claim 6 is characterized in that: each detonation bullet is corresponding to be provided with a Time Delay Squib.
8. high-energy gas generator according to claim 6 is characterized in that: fill solid, liquid or solid liquid mixing attitude explosive or gunpowder in the said detonation bullet.
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|---|---|---|---|---|
| US4966416A (en) * | 1981-07-21 | 1990-10-30 | Ici Australia Limited | Fragmentation of an underground ore body |
| CN2479209Y (en) * | 2001-03-23 | 2002-02-27 | 西安石油学院 | Press expanding loose oil well production-increasing means |
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2008
- 2008-12-29 CN CN2008100802420A patent/CN101440704B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966416A (en) * | 1981-07-21 | 1990-10-30 | Ici Australia Limited | Fragmentation of an underground ore body |
| CN2479209Y (en) * | 2001-03-23 | 2002-02-27 | 西安石油学院 | Press expanding loose oil well production-increasing means |
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