CN103032059A - Directional hydraulic fracturing connected mining method - Google Patents
Directional hydraulic fracturing connected mining method Download PDFInfo
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- CN103032059A CN103032059A CN201210560504XA CN201210560504A CN103032059A CN 103032059 A CN103032059 A CN 103032059A CN 201210560504X A CN201210560504X A CN 201210560504XA CN 201210560504 A CN201210560504 A CN 201210560504A CN 103032059 A CN103032059 A CN 103032059A
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Abstract
The invention discloses a directional hydraulic fracturing connected mining method, which comprises the following steps of: performing directional well spacing; performing fracturing connection; continuously mining; and designing and arranging a fracturing well group along a cleavage direction by detecting a natural cleavage fracture direction of an ore body so as to produce and extend a horizontal fracture along a designed cleavage direction, wherein the connection direction of hydraulic fracturing can be manually controlled and vertical fractures are avoided so as to prevent disasters such as ground brine emerging and pollution of farmlands and fish ponds due to serious water filling of a cover layer; the recovery ratio of the resource is greater than or equal to 70 percent (including recovery of a second-stage mining project) and is higher than that of any mining method; the safety of a cavern roof is improved and the life of a production well is naturally prolonged by regularly arranging (similar to a room-and-pillar method) pillars of an underground cavern and an ore bed goaf; and the recovery ratio of the resource is improved.
Description
Technical field
The present invention relates to the hydraulic fracture mining technology in halogen deposition ore bed and oil field, refer to especially a kind of directed hydraulic pressure burst communicatin exploitation method.
Background technology
The rock salt hydrofracturing method exploitation that the seventies China rises is introduced from oil exploitation technology.When carrying out the ore bed fracturing, when high-pressure pump will substantially exceed the water yield injection drilling well of formation absorption ability, near near the pressure of geostatic stress and ore bed tensile strength will producing above borehole wall the drilling well base, namely in ore bed, form horizontal fracture, but but not along the extension direction in crack but any direction arranges well group, arrange well group, carry out the hydraulic fracture mining of resource.The amplitude of this method volume increase is large, but the generation direction of horizontal fracture in the pressing crack construction, namely two well pressure burst communicatin directions are difficult to control, and in pressure break phase and back production period, ground emits the phenomenon of halogen to emerge in an endless stream, so that molten chamber (stope) ore pillar is also disorderly and unsystematic in underground arrangement, causes molten chamber top board to collapse in advance, and the producing well life-span is short, the extremely low only shortcoming such as 9%-15% of the rate of extraction of resource.
Summary of the invention
In view of this, the object of the invention is to propose a kind of directed hydraulic pressure burst communicatin exploitation method, the generation direction of horizontal fracture in the manual control pressing crack construction, i.e. two well fracturing communication direction, nationality improves the rate of extraction of resource to prolong the life-span of producing well.
Based on above-mentioned purpose a kind of directed hydraulic pressure burst communicatin exploitation method provided by the invention, may further comprise the steps: directed well spacing, pressure burst communicatin, continuously exploitation;
Described directed well spacing: survey the natural cleavage fissure direction of ore body, along the design of cleavage direction and layout pressure break well group, and drilling well is implemented a little less than open shaft bottom end, well cementation, cleaning bottom of hole, pressure testing in main kill-job bottom.
Described pressure burst communicatin: described open well carries out individual well and builds groove before pressing crack construction, form a low stress and discharge the district, molten chamber, described main kill-job shaft bottom is communicated with natural cleavage crack, fracturing fluid is injected in the main kill-job, increase along with of the fracturing fluid, pressure increases gradually, fracturing fluid is clamp-oned in the natural cleavage crack expanded the formation horizontal fracture, fracturing fluid constantly dissolves ore in horizontal fracture, enlarge horizontal fracture width and height, the acceleration level crack is along the extension expansion of natural cleavage fractuer direction; After occurring being communicated with reaction, strengthen the water injection rate of main kill-job, and open open well and carry out open flow, make the fracturing fluid in the horizontal fracture accelerate to push ahead molten chamber, through open well shaft bottom, the molten chamber of two bottom is connected;
Described continuous exploitation: fracturing fluid is injected in the main kill-job continuously, constantly dissolve ore bed and widen high-level crack, propelling along with pressing crack construction, of the fracturing fluid concentration constantly increases to producing desired concn and flowing in the molten chamber of open well, again by the halogen-extracting pump water filling, bittern water in the molten chamber lifted cause in the halogen pond, halogen-extracting pump room, heavyly thereafter send salt manufacturing after clear.
In one embodiment, in the described directed well spacing step, the communication direction of described main kill-job and described open well is consistent with the natural cleavage direction of ore bed, and described main kill-job bottom is than the low 2-3 rice of described open shaft bottom end.
In another kind of embodiment, in the described pressure burst communicatin step, described open well carries out individual well, and to build the corrosion radius of groove be 3-5 rice.
In another kind of embodiment, in the described pressure burst communicatin step, if described main kill-job shaft bottom directly is not communicated with the cleavage crack when drilling well, then before described pressure burst communicatin step is implemented, carry out individual well and build groove the described main kill-job shaft bottom borehole wall is communicated with the cleavage crack, and the corrosion radius that main kill-job individual well is built groove is 3-5 rice.
In another kind of embodiment, in the described pressure burst communicatin step, described connection reaction bubble occurs for described open well, and bubble is more and more, forms at last overflow, and the force value that simultaneously main kill-job produces descends.
In another kind of embodiment, in the described pressure burst communicatin step, opening after the described open well before the open flow, guarantee that described main kill-job and described open well have the reaction of connection between the two.
In another kind of embodiment, in the described pressure burst communicatin step, if there is body refuse to stop up in the horizontal fracture, in time take counter-pressure method, guarantee that described main kill-job and described open well connect between the two.
In another kind of embodiment, if the seam thickness of described main kill-job during greater than 1.5 meters, then the bore hole height of ore bed is controlled at below 1.5 meters or uses the packing mouth to carry out packing.
In another kind of embodiment, described main kill-job has a plurality of ore beds, except and molten ore bed, all the other ore beds adopt order from bottom to top to implement respectively the pressure break exploitation.
In another kind of embodiment, operation can stop production to overhaul after at least 3 months continuously in described directed hydraulic pressure burst communicatin exploitation.
Can find out from above, the directed hydraulic pressure burst communicatin exploitation method of two wells provided by the invention or many wells makes the communication direction of fracturing can manual control, its design direction success rate is absolutely, and the rate of extraction of resource contains the back production of the second stage of exploitation engineering more than or equal to 70%(), be higher than any mining methods.
Directed hydraulic pressure burst communicatin exploitation method provided by the invention, because the manual control of the communication direction of its pressure break makes Underground Dissolved Cavity can arrange by rule (similar room-and-pillar method) with ore pillar, the safety that has improved molten chamber top board has prolonged life-span of producing well;
Directed hydraulic pressure burst communicatin exploitation method provided by the invention in pressing crack construction, avoided producing vertical fracture may, emit halogen, polluted agricultural land, the appearance of the disasters such as fish pond thereby stopped the ground that a large amount of water-fillings because of ore bed cause;
The time that molten chamber (stope) is built up in the directed hydraulic pressure burst communicatin exploitation method provided by the invention short (contain large pump priming and expand the groove phase) is so drop into the back production instant effect.
Horizontal fracture extends along the cleavage direction in the directed hydraulic pressure burst communicatin exploitation method provided by the invention, because the high-dissolvability of cleavage crack ore is so that after being communicated with the well group operation, contained resource concentration is high in the fracturing fluid, can reach saturated (Be'25 °).
Description of drawings
Fig. 1 is the schematic flow sheet of the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention;
Fig. 2 is that orientation and the mechanical property of twisting structural plane of the cleavage of the ore bed implemented in the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention-Chinese the second subsiding belt becomes schematic diagram;
Fig. 3 is the design of pressure break well group in the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention and arranges schematic diagram;
Fig. 4 be in the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention in the pressure burst communicatin process pressure in main kill-job shaft bottom change schematic diagram.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
A kind of directed hydraulic pressure burst communicatin exploitation method may further comprise the steps: directed well spacing, pressure burst communicatin, continuously exploitation;
Described directed well spacing: survey the natural cleavage fissure direction of ore body, along the design of cleavage direction and layout pressure break well group, and drilling well is implemented a little less than open shaft bottom end, well cementation, cleaning bottom of hole, pressure testing in main kill-job bottom.
Described pressure burst communicatin: described open well carries out individual well and builds groove before pressing crack construction, form a low stress and discharge the district, molten chamber, described main kill-job shaft bottom is communicated with natural cleavage crack, fracturing fluid is injected in the main kill-job, increase along with of the fracturing fluid, pressure increases gradually, fracturing fluid is clamp-oned in the natural cleavage crack expanded the formation horizontal fracture, fracturing fluid constantly dissolves ore in horizontal fracture, enlarge horizontal fracture width and height, the acceleration level crack is along the extension expansion of natural cleavage fractuer direction; After occurring being communicated with reaction, strengthen the water injection rate of main kill-job, and open open well and carry out open flow, make the fracturing fluid in the horizontal fracture accelerate to push ahead molten chamber, through open well shaft bottom, the molten chamber of two bottom is connected;
Described continuous exploitation: fracturing fluid is injected in the main kill-job continuously, constantly dissolve ore bed and widen high-level crack, propelling along with pressing crack construction, of the fracturing fluid concentration constantly increases to producing desired concn and flowing in the molten chamber of open well, again by the halogen-extracting pump water filling, bittern water in the molten chamber lifted cause in the halogen pond, halogen-extracting pump room, heavyly thereafter send salt manufacturing after clear.
Fig. 1 is the schematic flow sheet of the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention; Wherein, the flow process of directed well spacing comprises surveys ore body cleavage direction, accordingly direction design well location and directed well spacing, drilling well, well cementation; The flow process of pressure burst communicatin comprises that open well individual well builds groove, annotates fracturing fluid in the main kill-job, and dissolving ore bed and cleavage crack form horizontal fracture, strengthen water injection rate, opens open well open flow and two wells and is communicated with; The flow process of exploitation comprises heavy cleer and peaceful saturated bittern in the interior fracturing fluid of the open well of recovery, the halogen pond continuously, at last saturated bittern is lifted extremely flour halogen pond.
Directed well spacing described in the described directed hydraulic pressure burst communicatin exploitation method is at first surveyed the Distribution Pattern of the natural cleavage fissure direction of ore body, thereafter, and along the design of cleavage direction with arrange the pressure break well group; Fig. 2 is that the orientation of twisting structural plane and the mechanical property of the cleavage of Chinese the second subsiding belt in the embodiment of the invention becomes schematic diagram.After the halogen sedimentary deposit formed rock, under the effect of earth neotectonic movement, the earth's crust produced the compressional structure ore bed, and country rock is subjected to the impact of compressional structure simultaneously, formed two groups of cleavage with the association of main structure.Cleavage is in deformation process, and one group is transformed into the pressure property turned round, and another group then changes a property turned round into.These two groups of mutual meets of cleavage become X-type.With reference to Fig. 2, the subsiding belt in the embodiment of the invention is Chinese the second subsiding belt, and the main fracture of the neotectonics of this subsiding belt is the north north east direction, and first group of association cleavage is north north east to arrangement, and second group is north-northwest to arrangement.
When in halogen deposition ore body, carrying out tunnel driving or ground drilling, all can run into cleavage surface in the ore bed.Cleavage surface not only can affect the intensity of rock body quality of mine, compares with other face simultaneously, and the tensile strength of cleavage surface, compressive strength, tensile strength are all less than other face.In water-soluble mining, the rate of infiltration of water, dissolution velocity are all greater than other face in the cleavage surface, and this leak-off to water in the fracturing construction has been established good basis.
When carrying out the ore bed fracturing, the water yield that will substantially exceed the formation absorption ability when high-pressure pump is injected main kill-job, behind near the pressure that produces the main kill-job seat above near the geostatic stress main kill-job wall and ore bed tensile strength, namely just will form the crack in ore bed.When ore bed buried depth during less than more than 750 meters, there is very large probability to produce horizontal fracture.
Wherein, horizontal fracture is made the pressure condition of seam:
When 1, there was leak-off in ore bed, the pressure that the fractured well bottom forms horizontal fracture was:
In the formula: P
F---the fracture pressure of ore bed; P
S---strata pressure;
σ
Z---the vertical stress on stratum;
---the vertical tensile strength of rock;
The ripple of γ---rock is compared;
C
r---rock matrix compression coefficient C
b---the rock volume compression coefficient.
When 2, ore bed was without leak-off, the pressure that the shaft bottom end forms horizontal pressure-break was:
More above-mentioned two calculating formulas can be found out, because the existence of fracturing fluid leak phenomenon, so that fracture pressure decreases.This is owing to the liquid with pressure enters ore bed, has increased compression area, thereby has reduced fracture pressure.In open hole well because fracturing fluid leak and so that the amplitude that fracture pressure reduces between 25%-40%.
Because cleavage crack tensile strength is little, the level that the needs pressure that rises broken is low, and the good characteristics of infiltration leak-off are so when fracturing was constructed, natural cleavage surface was easily opened the formation horizontal fracture by fracturing fluid.In sum, intending fracturing well group (main kill-job, open well) long axis direction (be fracturing fracture---two well shaft bottom communication direction) arranges consistent with ore bed cleavage direction.
Fig. 3 is the design of pressure break well group in the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention and arranges schematic diagram; As shown in the figure, the pressure break well group is in design and wellbore construction, and well location is arranged along north north east or north-northwest cleavage direction.Utilize natural cleavage fissure direction, control fracturing horizontal fracture bearing of trend realizes drafting communication direction.Realize that namely fracturing well group (main kill-job, open well) long axis direction (be fracturing fracture---two well shaft bottom communication direction) arranges consistent with ore bed cleavage direction; After designing well location, come into effect drilling well, well cementation and cleaning bottom of hole pressure testing, the drilling well of section of the necessary strict implement CNPC of the operation such as described drilling well, well cementation, cleaning bottom of hole, pressure testing, Cheng Jing (completion) standard.
Simultaneously because formation breakdown ladder variation, the of the fracturing fluid flow direction and the fracture gradient direction that diminishes is consistent, and it is main namely flowing to above the inclination of ore body; Again because fracturing fluid dissolving ore has become bittern, bittern contains the few light halogen of mineral and is positioned at of the fracturing fluid top under gravitational differentiation, and this can make of the fracturing fluid molten speed faster than the molten speed of side, so when arranging mine, main kill-job bottom is slightly than the low 2-3 rice of open shaft bottom end.
Pressure burst communicatin is described in described a kind of directed hydraulic pressure burst communicatin exploitation method: before the pressure burst communicatin construction, the feedwater piping in the existing mill of pressure break must and the water injecting pump in halogen-extracting pump room be communicated with, and must have the good fracturing car of two service behaviours in the existing mill of pressure break at least to guarantee smooth construction.Simultaneously, before the pressure burst communicatin construction, open the moving molten groove of building of individual well of well, the corrosion radius of building groove is 3-5 rice, because the well location of described open well is higher than the well location of main kill-job, the moving molten purpose of building groove of the individual well of open well is that artificial low stress of creation discharges the district during for pressing crack construction, to reduce the fracture pressure of ore bed.After described open well individual well was built groove and finished, the halogen-extracting pump by the halogen-extracting pump room reclaimed individual well and builds the light bittern that groove produces, and concentrates on the halogen pond, until heavy clear after, when continuous exploitation, injected in the producing well by the water injecting pump pressurization in halogen-extracting pump room and carry out coal mining.
If master's kill-job ore bed directly is not communicated with the cleavage crack during main kill-job drilling well, described main kill-job also needs to carry out the moving molten groove of building of individual well, and corrosion radius 3-5 rice then changes fracturing over to; The moving molten purpose of building groove of individual well is carried out in described main kill-job, that the main kill-job shaft bottom borehole wall directly is communicated with the cleavage crack, the fracturing fluid that starts so just can directly enter the cleavage crack, implements to open to split, and makes horizontal fracturing fracture push ahead gradually the molten chamber, shaft bottom of through open well along the cleavage direction; If existing cleavage surface appearance on the core of ore bed illustrates when the borehole wall directly has been communicated with the cleavage crack that described main kill-job needn't be built groove before the pressure break during main kill-job drilling well.If described main kill-job has been carried out after individual well builds groove, it produces light bittern and adopts open well individual well to build the same processing method of light bittern that groove produces.
Fig. 4 be in the directed hydraulic pressure burst communicatin exploitation method of the embodiment of the invention in the pressure burst communicatin process pressure in main kill-job shaft bottom change schematic diagram; A---the fracture pressure of cleavage surface rock, b---the fine fisssure height oozes the fracture pressure of rock, P
F---fracture pressure, P
E---extending pressure, P
S---strata pressure.
Water injecting pump by the halogen-extracting pump room is introduced water in the feedwater piping in the existing mill of pressure break, and then utilizes the high-pressure pump on the Hydraulic vehicle that the water in the feedwater piping is injected in the described main kill-job, forms fracturing fluid; Along with the increase of water injection rate, of the fracturing fluid pressure increases gradually, and then fracturing fluid directly is squeezed in the natural cleavage crack, or the groove that passes through to build is squeezed in the natural cleavage crack; When pressure increases the fracture pressure value that reaches the cleavage surface rock gradually, namely the P value equals P
FDuring (a value) value (with reference to Fig. 4), the formation horizontal fracture is opened by fracturing fluid in natural cleavage crack; Clamp-on along with of the fracturing fluid in the horizontal fracture, because fracturing fluid is open fracture not only, and dissolve simultaneously ore, enlarge horizontal fracture width and height, thereby accelerated the extension expansion of horizontal fracture, therefore, make the hydraulically created fracture in the ore bed advance through target well (open well) along drafting direction.
In the pressure burst communicatin construction, observe the pressure burst communicatin reaction, generally in pressure burst communicatin construction a few hours or at the most in five days, the pressure burst communicatin reaction is just arranged---be that bubble appears in described open well, and bubble is more and more, form at last overflow, of the fracturing fluid force value descends in described main kill-job this moment simultaneously, transfers extending pressure value---P to
EValue (b value) (with reference to Fig. 4) at this moment will be changed halogen-extracting pump and strengthen water injection rate, of the fracturing fluid force value is greater than or equals the extending pressure value, makes the fracturing fluid Rapid Expansion, is strictly on guard against the horizontal fracture obstruction; Open simultaneously described open well and carry out open flow, make described main kill-job and described open well cause an artificial low-pressure area between the two, nationality to be reducing the fracture pressure value, and forms suction force; Principal pressure, the suction force when opening the lateral compression power of well and opening the well open flow accelerated in the described open well of inflow the fracturing fluid in the horizontal fracture with towards a direction when at this moment described main well killing fluid flowed.If there is body refuse to stop up in the crack, should in time take counter-pressure method, guarantee that described main kill-job and described open well have a straightway passage between the two.Behind the described open well open flow, the halogen-extracting pump by the halogen-extracting pump room reclaims the light bittern that open flow produces, and concentrates on the halogen pond, until heavy clear after, when continuous exploitation, injected in the producing well by the water injecting pump pressurization in halogen-extracting pump room and carry out coal mining.
Exploit continuously described in a kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention and be: fracturing fluid is injected in the described main kill-job continuously, in this process, fracturing fluid constantly dissolves the resource on the ore bed, and constantly expand horizontal fracture, propelling along with pressing crack construction, of the fracturing fluid concentration constantly increases, most open well shaft bottoms that arrive, and concentration can reach saturated.Pressure break enters the High Concentration Brine (Be'25 °) that the production phase produces, pass through again the halogen-extracting pump water filling in halogen-extracting pump room, the High Concentration Brine water that the pressure of water act principle nationality water filling will be opened in the molten chamber, well shaft bottom is lifted to flour halogen pond, ground, is transported to product processing factory with halogen transmitting pump again and makes production marketing.
It needs to be noted; in a kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention; those of ordinary skills will be appreciated that; when the seam thickness of described main kill-job during greater than 1.5 meters; then the bore hole height of ore bed is controlled at below 1.5 meters or at bed top and uses the packing mouth to carry out packing, with the protection bed top.
In a kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention, those of ordinary skills will be appreciated that, described main kill-job has a plurality of ore beds, and except also molten ore bed, all the other ore beds adopt order from bottom to top to implement respectively the pressure break exploitation.
In a kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention, described directed hydraulic pressure burst communicatin exploitation continuously operation can stop production to overhaul after at least 3 months, avoid passage between two wells to stop up or passage closed.
A kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention preferably is applicable in the past halogen (salt, sylvite, saltcake, the boron etc.) exploitation (containing the back production of the dull nugget in old liberated area) of sedimentary deposit of generation in the Tertiary Period and the second stage of back production engineering of ore pillar, but in other mining areas, as: contain the seam of making in the oil carbon rock stratum, recover petroleum also can select to use directed hydraulic pressure burst communicatin method of the present invention.
The preferred application conditions of a kind of directed hydraulic pressure burst communicatin exploitation method described in the embodiment of the invention is: the cleavage of (1) ore body is relatively grown; (2) seam thickness is more than 1.5 meters, the single or multiple lift inclined deposits of steady of roof; (3) non-DDGS is less than or equal to 30% mineral deposit; (4) two well shaft bottoms are communicated with at a distance of 100-200 rice; (5) ore bed buried depth 300-800 rice (6) bed top is without the aquifer, if top board has the aquifer, and at Cheng Jingqian, must first packing aquifer, and then Cheng Jing (well cementation).But under other conditions, also can select to use directed hydraulic pressure burst communicatin exploitation method of the present invention.
Those of ordinary skill in the field are to be understood that: the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a directed hydraulic pressure burst communicatin exploitation method is characterized in that, may further comprise the steps: directed well spacing, pressure burst communicatin, continuously exploitation;
Described directed well spacing: survey the natural cleavage fissure direction of ore body, along the design of cleavage direction and layout pressure break well group, and drilling well is implemented a little less than open shaft bottom end, well cementation, cleaning bottom of hole, pressure testing in main kill-job bottom.
Described pressure burst communicatin: described open well carries out individual well and builds groove before pressing crack construction, form a low stress and discharge the district, molten chamber, described main kill-job shaft bottom is communicated with natural cleavage crack, fracturing fluid is injected in the main kill-job, increase along with of the fracturing fluid, pressure increases gradually, fracturing fluid is clamp-oned in the natural cleavage crack expanded the formation horizontal fracture, fracturing fluid constantly dissolves ore in horizontal fracture, enlarge horizontal fracture width and height, the acceleration level crack is along the extension expansion of natural cleavage fractuer direction; After occurring being communicated with reaction, strengthen the water injection rate of main kill-job, and open open well and carry out open flow, make the fracturing fluid in the horizontal fracture accelerate to push ahead molten chamber, through open well shaft bottom, the molten chamber of two bottom is connected;
Described continuous exploitation: fracturing fluid is injected in the main kill-job continuously, constantly dissolve ore bed and widen high-level crack, propelling along with pressing crack construction, of the fracturing fluid concentration constantly increases to producing desired concn and flowing in the molten chamber of open well, again by the halogen-extracting pump water filling, bittern water in the molten chamber lifted cause in the halogen pond, halogen-extracting pump room, heavyly thereafter send salt manufacturing after clear.
2. directed hydraulic pressure burst communicatin exploitation method according to claim 1, it is characterized in that, in the described directed well spacing step, the communication direction of described main kill-job and described open well is consistent with the natural cleavage direction of ore bed, and described main kill-job bottom is than the low 2-3 rice of described open shaft bottom end.
3. directed hydraulic pressure burst communicatin exploitation method according to claim 2 is characterized in that, in the described pressure burst communicatin step, described open well carries out individual well, and to build the corrosion radius of groove be 3-5 rice.
4. directed hydraulic pressure burst communicatin exploitation method according to claim 2, it is characterized in that, in the described pressure burst communicatin step, if molten chamber, described main kill-job shaft bottom directly is not communicated with the cleavage crack when drilling well, then before described pressure burst communicatin step is implemented, carry out individual well and build groove molten chamber, described main kill-job shaft bottom is communicated with the cleavage crack, and the corrosion radius that main kill-job individual well is built groove is 3-5 rice.
5. directed hydraulic pressure burst communicatin exploitation method according to claim 1 is characterized in that, in the described pressure burst communicatin step, described connection reaction bubble occurs for described open well, and bubble is more and more, forms at last overflow, and the force value that simultaneously main kill-job produces descends.
6. directed hydraulic pressure burst communicatin exploitation method according to claim 5 is characterized in that, in the described pressure burst communicatin step, is opening after the described open well before the open flow, guarantees that described main kill-job and described open well have the reaction of connection between the two.
7. directed hydraulic pressure burst communicatin exploitation method according to claim 6 is characterized in that, in the described pressure burst communicatin step, if there is body refuse to stop up in the horizontal fracture, in time takes counter-pressure method, guarantees that described main kill-job and described open well connect between the two.
8. directed hydraulic pressure burst communicatin exploitation method according to claim 1 is characterized in that, if the seam thickness of described main kill-job during greater than 1.5 meters, then the bore hole height of ore bed is controlled at below 1.5 meters or uses the packing mouth to carry out packing.
9. directed hydraulic pressure burst communicatin exploitation method according to claim 1 is characterized in that, described main kill-job has a plurality of ore beds, except and molten ore bed, all the other ore beds adopt order from bottom to top to implement respectively the pressure break exploitation.
10. according to claim 1 to the described directed hydraulic pressure burst communicatin exploitation method of 9 any one, it is characterized in that operation can stop production to overhaul after at least 3 months continuously in described directed hydraulic pressure burst communicatin exploitation.
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