CN117166967A - Hydrate exploitation method and device for reforming reservoir by artificially induced regional sedimentation - Google Patents
Hydrate exploitation method and device for reforming reservoir by artificially induced regional sedimentation Download PDFInfo
- Publication number
- CN117166967A CN117166967A CN202310787410.4A CN202310787410A CN117166967A CN 117166967 A CN117166967 A CN 117166967A CN 202310787410 A CN202310787410 A CN 202310787410A CN 117166967 A CN117166967 A CN 117166967A
- Authority
- CN
- China
- Prior art keywords
- production
- well
- production well
- reservoir
- hydrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004062 sedimentation Methods 0.000 title claims description 8
- 238000002407 reforming Methods 0.000 title abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 230
- 238000003860 storage Methods 0.000 claims abstract description 71
- 238000010276 construction Methods 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 25
- 239000007787 solid Substances 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000001939 inductive effect Effects 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 150000004677 hydrates Chemical class 0.000 claims abstract description 4
- 239000003345 natural gas Substances 0.000 claims abstract description 4
- 239000008247 solid mixture Substances 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 29
- 239000004576 sand Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 25
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 239000013535 sea water Substances 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 230000000638 stimulation Effects 0.000 claims description 9
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 244000126211 Hericium coralloides Species 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000009918 complex formation Effects 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 10
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Artificial Fish Reefs (AREA)
Abstract
The invention discloses a hydrate exploitation method and a hydrate exploitation device for reforming a reservoir by manually inducing regional settlement, which are characterized in that a production well drilling procedure is carried out in a lower disturbance region, a plurality of horizontal branch wells are constructed in a lower region of a production well, a production well drilling procedure is carried out in a well construction production region, and a production well is constructed in the middle position of the hydrate reservoir; and (3) finishing engineering construction stage procedures, putting a production well production string into a production well to extract hydrates, lifting the gas-liquid-solid mixture obtained by extraction to an offshore extraction platform, and extracting pure natural gas for storage and transportation to an operation site through separation treatment of gas-liquid-solid separation storage equipment. According to the method, through well site design, formation creep settlement phenomenon existing in the process of exploiting a hydrate weakly consolidated reservoir is utilized, complex formation communication cracks are formed through reasonable-design engineering implementation and settlement control, large-scale storage and improvement communication of the hydrate reservoir is realized, and an effective economic high-yield hydrate exploitation mode is formed.
Description
Technical Field
The invention relates to the technical field of natural gas hydrate exploitation equipment, in particular to a hydrate exploitation method and device for reforming a reservoir by artificially inducing regional settlement.
Background
At present, two rounds of natural gas hydrate test production engineering are realized in China, the feasibility of the production engineering implementation is verified, the production transformation stage is realized, the promotion of the industrialization stage is accelerated, the production capacity is improved, the production cost is reduced, and the industrial application of the natural gas hydrate is truly realized. The decompression mining method adopted by the implementation of the first two rounds of trial mining engineering still has the key problems of high mining cost, high yield decrement speed, difficult stable and high yield and the like facing the industrial application requirements. Most of natural gas hydrate reservoirs are of low-permeability unconsolidated argillaceous silt natural gas hydrate reservoir types, the reservoir permeability is low and peristaltic deformation is easy to occur, the reservoir is modified by referring to a common hydraulic fracturing method in the oil and gas industry, although construction is feasible, a channel established by the reservoir modification is difficult to maintain, the depth and the breadth of the modification are limited by engineering technical levels, and an effective high-permeability reservoir diversion channel is difficult to establish.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a hydrate exploitation method and device for reforming a reservoir by manually inducing regional settlement.
The invention is realized by the following technical scheme: a hydrate recovery method for artificially inducing regional sedimentation to reform a reservoir, comprising the following steps:
step one: selecting a proper natural gas hydrate reservoir as a exploitation object, building an offshore exploitation platform in an offshore area, placing drilling equipment and a sleeve required by drilling and well construction on the offshore exploitation platform, and placing a gas storage tank, a gas-liquid-solid separation storage device, a pumping material storage device and a liquid storage heating device required by exploiting the hydrate reservoir; the hydrate reservoir comprises an upper cover layer, an upper reservoir region, a well construction production region, a lower disturbance region and a lower cover layer from top to bottom; constructing a production well for hydrate exploitation, wherein the production well penetrates through the sea water area, the upper covering layer, the upper reservoir area and the well construction production area from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; building a yield increasing well below a production well positioned in a well building production area;
step two: carrying out a production well drilling procedure in a lower disturbance area, and carrying out construction of a plurality of horizontal branch wells in the lower area of the production well;
step three: carrying out a production well drilling procedure in a well-building production area, building a production horizontal section at the middle position of a hydrate reservoir, and extending a production vertical section connected with the production horizontal section upwards to an offshore exploitation platform; after the production well is drilled, a production well cementing sleeve is put into the production well, a production well cement ring is built outside the sleeve, and a production well production pipe column is put into the production well cementing sleeve during exploitation;
step four: the method comprises the steps of performing a reservoir reconstruction process of a production well in a well construction production area, lowering a continuous oil pipe provided with hydraulic perforation pumping equipment, extracting hot seawater in a liquid storage heating equipment for hydraulic jetting, forming penetrating hydraulic jet holes on a well cementation sleeve of the production well and a cement ring of the production well, then pumping material storage equipment to inject glycol and curing resin into the hydraulic jet holes, forming a high-diversion channel by liquid ejected from the hydraulic jet holes, and communicating the production well with a production well by the high-diversion channel;
step five: and (3) finishing engineering construction stage procedures, putting a production well production string into a production well to extract hydrates, lifting the gas-liquid-solid mixture obtained by extraction to an offshore extraction platform, and extracting pure natural gas for storage and transportation to an operation site through separation treatment of gas-liquid-solid separation storage equipment.
The hydrate exploitation device comprises an offshore exploitation platform, an air storage tank, a gas-liquid-solid separation storage device connected with the air storage tank, a pumped material storage device, a liquid storage heating device, a production well and a yield increase well; the offshore exploitation platform is built in an offshore area where a natural gas hydrate reservoir is explored; the hydrate reservoir comprises an upper cover layer, an upper reservoir region, a well construction production region, a lower disturbance region and a lower cover layer from top to bottom; the production well is built in a lower disturbance area, the production well comprises a vertical section and a horizontal section connected with the vertical section, the horizontal section is provided with a plurality of horizontal branch wells, and the horizontal branch wells are built in the lower disturbance area; constructing a production well for hydrate exploitation, wherein the production well penetrates through a sea water area, an upper covering layer, an upper reservoir area and a well construction production area from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; the production horizontal section is built in the middle of the hydrate reservoir and is positioned above the production well, and the production vertical section extends upwards to the offshore exploitation platform; the production well comprises a production well cement ring, a production well cementing sleeve and a production well production tubular column from outside to inside, a continuous oil pipe provided with hydraulic perforation pumping equipment is arranged in a reservoir reconstruction process, hot seawater in a liquid storage heating equipment is extracted for hydraulic spraying, and penetrating hydraulic jet holes are formed on the production well cementing sleeve and the production well cement ring; the pumping material storage equipment injects glycol and solidified resin into the hydraulic jet holes, the liquid ejected from the hydraulic jet holes forms a high-diversion channel, and the high-diversion channel communicates the production well with the production well; the production well is connected with the gas-liquid-solid separation storage device, the pumping material storage device and the liquid storage heating device respectively.
The stimulation well is filled with sand grains with a diameter not smaller than 10-20 times the grain size of the reservoir sand grains in the hydrate reservoir.
The horizontal branch wells are positioned on the same horizon parallel to the horizontal production section and are distributed in a comb-tooth shape; or, the horizontal branch wells are distributed in a fishbone-shaped distribution form which is distributed at intervals and extends in multiple directions.
The horizontal branch wells are positioned at different levels; or, in the plurality of horizontal branch wells, one part of the horizontal branch wells are positioned on the same horizon, and the other part of the horizontal branch wells are positioned on different horizons.
The production well production pipe column is provided with a sand control screen pipe, and the sand control screen pipe is arranged at the production horizontal section position after being installed and put in; gravel is filled in the sand control screen pipe.
The particle size of the gravel is 6-10 times of the particle size of reservoir particles in a well construction production area or a lower disturbance area.
Compared with the prior art, the invention has the advantages that: according to the exploitation method and device, a well construction mode of a double-layer multi-branch horizontal well is adopted, and an upper horizontal well is used as a production well of natural gas hydrate and is used for exploiting the hydrate; the lower multi-branch horizontal well is used as a stimulation well for reforming a natural gas hydrate reservoir and is used for reforming the hydrate reservoir. The exploitation method aims at realizing the large-range regional reservoir disturbance of the natural gas hydrate reservoir through the construction of a plurality of multidirectional yield-increasing wells, inducing regional stratum settlement so as to change the original stable condition of the reservoir, generating complex microcracks, increasing the seepage capability of the stratum, continuously decomposing the stratum hydrate along with the increase of the depressurization exploitation duration of the natural gas hydrate to reduce the mechanical strength of the stratum around the shaft, continuously downwards settling and compacting the sediment, gradually forming stratum cavities around the production shaft, changing the stable state of the hydrate stratum at the upper part of the reservoir, and then, also generating stratum settlement to form a new communication channel to enlarge the exploitation range. The mining method utilizes the formation creep settlement phenomenon existing in the mining process of the hydrate weakly consolidated reservoir through reasonable theoretical analysis and well position design, and forms complex formation communication cracks through reasonable-design engineering implementation and settlement control, so that the large-scale storage and modification communication of the hydrate reservoir is realized, and an effective economic and high-yield hydrate mining mode is formed.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the structure on the left side of FIG. 1;
FIG. 3 is a schematic view showing the structural details of a hydraulic jet according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a horizontal branch well in a comb-tooth distribution form according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a horizontal branch well according to an embodiment of the present invention in a fishbone distribution;
fig. 6 is a schematic structural diagram of a horizontal branch well in an irregularly distributed form according to an embodiment of the present invention.
The meaning of the reference numerals in the figures: 1. an offshore mining platform; 2. a gas storage tank; 3. a gas-liquid-solid separation storage device; 4. pumping material storage equipment; 5. a liquid storage heating device; 6. a production well production string; 7. producing well cementation casing; 8. a production well cement sheath; 9. a stimulation well; 10. hydraulic jet holes; 11. a high diversion channel; 12. gravel; a. a sea water area; b. an upper cover layer; c. an upper reservoir region; d. building a well production area; e. a lower disturbance zone; f. and a lower cover layer.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Examples
Referring to fig. 1 to 6, a hydrate exploitation method for modifying a reservoir by artificially inducing regional settlement comprises the following steps:
step one: selecting a proper natural gas hydrate reservoir as a exploitation object, constructing an offshore exploitation platform 1 in an offshore area, placing drilling equipment and a sleeve required by drilling and well construction on the offshore exploitation platform 1, and placing a gas storage tank 2, a gas-liquid-solid separation storage device 3, a pumping material storage device 4 and a liquid storage heating device 5 required by exploiting the hydrate reservoir; the hydrate reservoir comprises an upper cover layer b, an upper reservoir region c, a well construction production region d, a lower disturbance region e and a lower cover layer f from top to bottom; constructing a production well for hydrate exploitation in the sea water area a, wherein the production well penetrates through the sea water area a, the upper covering layer b, the upper reservoir area c and the well construction production area d from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; building a yield increasing well 9 below a production well positioned in a well building production area d;
step two: carrying out a drilling procedure of a production well 9 in a lower disturbance area e, and carrying out construction of a plurality of horizontal branch wells in a lower area of the production well; the construction of a plurality of horizontal branch wells has the effects that firstly, the original stable stratum of the hydrate reservoir is interfered, the mechanical property of the stratum is disturbed, the strength of the reservoir is weakened, a recombined reservoir communication crack is formed, and the decomposition of the hydrate and the communication of the reservoir are promoted;
step three: carrying out a production well drilling procedure in a well construction production area d, constructing a production horizontal section at the middle position of a hydrate reservoir, and extending a production vertical section connected with the production horizontal section upwards to an offshore exploitation platform 1; after the production well is drilled, a production well cementing sleeve 7 is put into the production well, a production well cement ring 8 is built outside the sleeve, and a production well production pipe column 6 is put into the production well cementing sleeve 7 in a penetrating way during exploitation; the well cementation sleeve 7 of the production well is arranged, so that the shaft strength of the production well can be enhanced, and the condition that the shaft deformation does not occur in the stratum settlement process to influence the production channel is ensured;
step four: the method comprises the steps of performing a reservoir reconstruction process of a production well in a well construction production area d, lowering a continuous oil pipe provided with a hydraulic perforation pumping device 4, pumping hot seawater in a liquid storage heating device 5 for hydraulic spraying, forming a penetrating hydraulic jet hole 10 on a well cementing sleeve 7 of the production well and a cement ring 8 of the production well, then pumping a material storage device 4 to inject glycol and solidified resin into the hydraulic jet hole 10, forming a high diversion channel 11 by liquid ejected from the hydraulic jet hole 10, and communicating the production well with a production well 9 by the high diversion channel 11;
step five: and (3) finishing engineering construction stage procedures, putting a production well production string 6 into a production well to extract hydrates, lifting the gas-liquid-solid mixture obtained by extraction to an offshore extraction platform 1, and extracting pure natural gas for storage and transportation to an operation site through separation treatment of a gas-liquid-solid separation storage device 3.
The hydrate exploitation device for reconstructing a reservoir by artificially inducing regional settlement comprises an offshore exploitation platform 1, an air storage tank 2, a gas-liquid-solid separation storage device 3 connected with the air storage tank 2, a pumping material storage device 4, a liquid storage heating device 5, a production well and a production well 9; the offshore exploitation platform 1 is built in an offshore area where a natural gas hydrate reservoir is explored; the hydrate reservoir comprises an upper cover layer b, an upper reservoir region c, a well construction production region d, a lower disturbance region e and a lower cover layer f from top to bottom; the production well 9 is built in a lower disturbance area e, the production well 9 comprises a vertical section and a horizontal section connected with the vertical section, the horizontal section is provided with a plurality of horizontal branch wells, and the horizontal branch wells are built in the lower disturbance area e; constructing a production well for hydrate exploitation, wherein the production well penetrates through the sea water area a, the upper covering layer b, the upper reservoir area c and the well construction production area d from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; the production horizontal section is built in the middle of the hydrate reservoir and is positioned above the production well 9, and the production vertical section extends upwards to the offshore exploitation platform 1; the production well comprises a production well cement sheath 8, a production well cementing sleeve 7 and a production well production tubular column 6 from outside to inside, a continuous oil pipe provided with hydraulic perforation pumping equipment is put into a reservoir reconstruction process, hot seawater in the liquid storage heating equipment 5 is extracted for hydraulic spraying, and a penetrating hydraulic jet hole 10 is formed on the production well cementing sleeve 7 and the production well cement sheath 8; the pumping material storage device 4 injects glycol and solidified resin into the hydraulic jet flow hole 10, the liquid ejected from the hydraulic jet flow hole 10 forms a high diversion channel 11, and the high diversion channel 11 communicates a production well with a production well 9; the production well is respectively connected with the gas-liquid-solid separation storage device 3, the pumping material storage device 4 and the liquid storage heating device 5. In this embodiment, the hydraulic perforation pumping device is an existing device, the specific structure of which is not shown (also not shown in the drawings), and the hydraulic perforation pumping device is lowered during the reservoir reformation process, and the hydraulic perforation pumping device is lowered into the production well through the coiled tubing, and hydraulic perforation and pumping measures are performed during the reservoir reformation process. After the reservoir reconstruction process is completed, the hydraulic perforation pumping equipment needs to be withdrawn. In this embodiment, the liquid separation outlet of the gas-liquid-solid separation storage device 3, and the outlets of the pumping material storage device 4 and the liquid storage heating device 5 are connected with the inlet of the production well, the outlet of the production well is connected with the inlet of the gas-liquid-solid separation storage device 3, the gaseous separation outlet of the gas-liquid-solid separation storage device 3 is connected with the gas storage tank 2, the bottom of the gas-liquid-solid separation storage device 3 is provided with a solid separation outlet (not shown in the figure), and only the reservoir sand is required to be discharged, and the reservoir sand can be used for recycling or is discharged back to the seabed mud surface; the inlet of the liquid storage heating equipment 5 is communicated with seawater through a pipeline and a water pump. In fig. 1 and 2, the arrows point in the direction of migration.
The stimulation well 9 is filled with sand having a diameter not less than 10 to 20 times the grain size of the reservoir sand in the hydrate reservoir. In this embodiment, after the well is built, the yield-increasing well 9 is filled with large-diameter sand grains, on one hand, to increase the permeability of the stratum, and to establish a rapid channel for decomposing and circulating the hydrate, on the other hand, to regulate the sedimentation development path of the stratum, it can be known that the sedimentation of the stratum has occurred around the wellbore, and complex communication cracks formed after the sedimentation realize large-scale reservoir communication, and realize circulation through the rapid channel with high permeability. In this embodiment, the upper reservoir region c, the well-formation production region d, and the lower disturbance region e are all hydrate reservoirs, and the sizes of the reservoir sand grains in the hydrate reservoirs are substantially uniform, so that the diameter of the filled sand grains in the stimulation well 9 is selected to be not smaller than 10 to 20 times the particle size of the reservoir sand grains in the hydrate reservoirs.
In this embodiment, the drilling process of the production well 9 is advanced, after the horizontal branch well is built in the horizontal section of the production well 9, sand filling is performed on the production well 9, after the vertical section of the production well 9, which does not overlap with the production well, is filled with sand, the production well is built on the basis of the vertical section of the production well 9, and the production vertical section of the production well and the vertical section of the production well 9 are partially overlapped (the overlapping part is a part shared by both).
The plurality of horizontal branch wells are positioned on the same layer parallel to the horizontal production section and are distributed in a comb-tooth shape; or, the plurality of horizontal branch wells are distributed in a fishbone shape which is distributed at intervals and extends in multiple directions. In this embodiment, the structure of the stimulation well 9 of the horizontal branch well may be designed according to the actual requirement of the engineering, and the specific structure may be a comb-shaped distribution form, a fishbone-shaped distribution form, or an irregular distribution form according to the distribution rule of the reservoir hydrate, and other distribution forms of the stimulation well 9 meeting the requirements of construction safety and engineering design.
The plurality of horizontal branch wells are positioned at different levels; or, in the plurality of horizontal branch wells, one part of the horizontal branch wells are positioned on the same horizon, and the other part of the horizontal branch wells are positioned on different horizons. The plurality of horizontal branch wells of stimulation well 9 may be designed to be co-located or multi-located according to the actual needs of the project.
A sand control screen pipe is assembled on the production well production pipe column 6 and is positioned at the production horizontal section after being installed and put in; gravel 12 is packed in the sand control screen. And (3) setting the sand control screen, comprehensively considering production efficiency factors, and reasonably and moderately preventing sand according to the designed sand control mesh.
The particle size of the gravel 12 is 6 to 10 times the particle size of the reservoir particles in the well production zone d or the lower disturbance zone e. By the sand control action of the packed gravel 12, the time and amount of reservoir particulates entering the production well is hindered and slowed.
In this embodiment, the interval distance between the production well and the production well 9 is determined according to the actual engineering design, and the communication between the storage and modification measure and the production well 9 is ensured on the basis of the construction safety of the well. In the process of breaking hydrate by hydraulic jet of hydraulic perforation pumping equipment, chemical materials such as glycol, curing resin and the like can be injected simultaneously, so that the decomposition of partial hydrate is quickened, the secondary generation of the hydrate is restrained, a stable high-diversion channel 11 is formed, the production well and the yield-increasing well 9 are communicated, and the stratum heat is further supplemented.
The embodiment adopts a well construction mode of a double-layer multi-branch horizontal well, wherein the upper layer is an upper layer production horizontal well, and the lower layer is a lower layer horizontal branch well of a yield increasing well 9; the upper layer production horizontal well is used as a production well of natural gas hydrate and is used for exploiting the hydrate; the multi-branch horizontal well at the lower layer of the production well 9 is used as the production well 9 for reforming the natural gas hydrate reservoir and is used for reforming the hydrate reservoir. The mining method aims at constructing a plurality of multidirectional yield-increasing wells 9, manufacturing a plurality of irregular caverns in the yield-increasing wells 9 by utilizing a hydraulic jet mode, realizing the wide-range regional reservoir disturbance of a natural gas hydrate reservoir, inducing the original stable condition of the reservoir to change, when the pressure reduction method is used for mining the hydrate, inducing the stratum in the region near the shaft of the yield-increasing wells 9 to generate sedimentation deformation along with the reduction of the pressure of the yield-increasing wells 9 after the pressure of the yield-increasing wells is reduced, damaging the stratum without consolidating rock to generate complex microcracks, and gradually forming stratum cavities along the shaft due to the fact that the mechanical strength of the stratum around the shaft is reduced due to the continuous decomposition of the natural gas hydrate, and gradually forming stratum cavities along the shaft due to the fact that the sediment is subsided and compacted, and the stratum stability state of the water-containing stratum at the upper part of the reservoir is changed along with the change of the stratum, so that a new communication channel is formed to enlarge the mining range, thereby achieving the purpose of deeply modifying the reservoir.
The foregoing detailed description is directed to embodiments of the invention which are not intended to limit the scope of the invention, but rather to cover all modifications and variations within the scope of the invention.
Claims (7)
1. A hydrate exploitation method for modifying a reservoir by artificially inducing regional sedimentation, which is characterized by comprising the following steps:
step one: selecting a proper natural gas hydrate reservoir as a exploitation object, building an offshore exploitation platform in an offshore area, placing drilling equipment and a sleeve required by drilling and well construction on the offshore exploitation platform, and placing a gas storage tank, a gas-liquid-solid separation storage device, a pumping material storage device and a liquid storage heating device required by exploiting the hydrate reservoir; the hydrate reservoir comprises an upper cover layer, an upper reservoir region, a well construction production region, a lower disturbance region and a lower cover layer from top to bottom; constructing a production well for hydrate exploitation, wherein the production well penetrates through the sea water area, the upper covering layer, the upper reservoir area and the well construction production area from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; building a yield increasing well in a lower disturbance area below a production well in a well building production area;
step two: carrying out a production well drilling procedure in a lower disturbance area, and carrying out construction of a plurality of horizontal branch wells in the lower area of the production well;
step three: carrying out a production well drilling procedure in a well-building production area, building a production horizontal section at the middle position of a hydrate reservoir, and extending a production vertical section connected with the production horizontal section upwards to an offshore exploitation platform; after the production well is drilled, a production well cementing sleeve is put into the production well, a production well cement ring is built outside the sleeve, and a production well production pipe column is put into the production well cementing sleeve during exploitation;
step four: the method comprises the steps of performing a reservoir reconstruction process of a production well in a well construction production area, lowering a continuous oil pipe provided with hydraulic perforation pumping equipment, extracting hot seawater in a liquid storage heating equipment for hydraulic jetting, forming penetrating hydraulic jet holes on a well cementation sleeve of the production well and a cement ring of the production well, then pumping material storage equipment to inject glycol and curing resin into the hydraulic jet holes, forming a high-diversion channel by liquid ejected from the hydraulic jet holes, and communicating the production well with a production well by the high-diversion channel;
step five: and (3) finishing engineering construction stage procedures, putting a production well production string into a production well to extract hydrates, lifting the gas-liquid-solid mixture obtained by extraction to an offshore extraction platform, and extracting pure natural gas for storage and transportation to an operation site through separation treatment of gas-liquid-solid separation storage equipment.
2. The utility model provides a hydrate exploitation device of artifical induced regional subsidence transformation reservoir which characterized in that: the device comprises an offshore exploitation platform, an air storage tank, a gas-liquid-solid separation storage device connected with the air storage tank, a pumping material storage device, a liquid storage heating device, a production well and a production well; the offshore exploitation platform is built in an offshore area where a natural gas hydrate reservoir is explored; the hydrate reservoir comprises an upper cover layer, an upper reservoir region, a well construction production region, a lower disturbance region and a lower cover layer from top to bottom; the production well is built in a lower disturbance area, the production well comprises a vertical section and a horizontal section connected with the vertical section, the horizontal section is provided with a plurality of horizontal branch wells, and the horizontal branch wells are built in the lower disturbance area; constructing a production well for hydrate exploitation, wherein the production well penetrates through a sea water area, an upper covering layer, an upper reservoir area and a well construction production area from top to bottom, and comprises a production vertical section and a production horizontal section connected with the production vertical section; the production horizontal section is built in the middle of the hydrate reservoir and is positioned above the production well, and the production vertical section extends upwards to the offshore exploitation platform; the production well comprises a production well cement ring, a production well cementing sleeve and a production well production tubular column from outside to inside, a continuous oil pipe provided with hydraulic perforation pumping equipment is arranged in a reservoir reconstruction process, hot seawater in a liquid storage heating equipment is extracted for hydraulic spraying, and penetrating hydraulic jet holes are formed on the production well cementing sleeve and the production well cement ring; the pumping material storage equipment injects glycol and solidified resin into the hydraulic jet holes, the liquid ejected from the hydraulic jet holes forms a high-diversion channel, and the high-diversion channel communicates the production well with the production well; the production well is connected with the gas-liquid-solid separation storage device, the pumping material storage device and the liquid storage heating device respectively.
3. The hydrate recovery device of the artificially induced regional subsidence improvement reservoir of claim 2, wherein: the stimulation well is filled with sand grains with a diameter not smaller than 10-20 times the grain size of the reservoir sand grains in the hydrate reservoir.
4. The hydrate recovery device of the artificially induced regional subsidence improvement reservoir of claim 2, wherein: the horizontal branch wells are positioned on the same horizon parallel to the horizontal production section and are distributed in a comb-tooth shape; or, the horizontal branch wells are distributed in a fishbone-shaped distribution form which is distributed at intervals and extends in multiple directions.
5. The hydrate recovery device of the artificially induced regional subsidence improvement reservoir of claim 2, wherein: the horizontal branch wells are positioned at different levels; or, in the plurality of horizontal branch wells, one part of the horizontal branch wells are positioned on the same horizon, and the other part of the horizontal branch wells are positioned on different horizons.
6. The hydrate recovery device of the artificially induced regional subsidence improvement reservoir of claim 2, wherein: the production well production pipe column is provided with a sand control screen pipe, and the sand control screen pipe is arranged at the production horizontal section position after being installed and put in; gravel is filled in the sand control screen pipe.
7. The hydrate recovery device of the artificially induced regional subsidence improvement reservoir of claim 6, wherein: the particle size of the gravel is 6-10 times of the particle size of reservoir particles in a well construction production area or a lower disturbance area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310787410.4A CN117166967A (en) | 2023-06-29 | 2023-06-29 | Hydrate exploitation method and device for reforming reservoir by artificially induced regional sedimentation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310787410.4A CN117166967A (en) | 2023-06-29 | 2023-06-29 | Hydrate exploitation method and device for reforming reservoir by artificially induced regional sedimentation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117166967A true CN117166967A (en) | 2023-12-05 |
Family
ID=88940172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310787410.4A Pending CN117166967A (en) | 2023-06-29 | 2023-06-29 | Hydrate exploitation method and device for reforming reservoir by artificially induced regional sedimentation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117166967A (en) |
-
2023
- 2023-06-29 CN CN202310787410.4A patent/CN117166967A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6694549B2 (en) | Silty marine natural gas hydrate gravel vomit mining method and mining equipment | |
| CN106761588B (en) | The recovery method and quarrying apparatus of jet crushing, reacting cycle conveying slurry ocean gas hydrate | |
| CN106761587B (en) | Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method | |
| US9784086B2 (en) | Method and process for extracting shale oil and gas by fracturing and chemical retorting in oil shale in-situ horizontal well | |
| CN108868706B (en) | Method for exploiting natural gas hydrate by directional drilling supercritical carbon dioxide fracturing and displacement | |
| US20160069170A1 (en) | Method and process for extracting shale oil and gas by fracturing and chemical retorting in oil shale in-situ vertical well | |
| CN103696775B (en) | The descending slip casting method of the high many group aquifer segmentations of large section | |
| CN104806217A (en) | Combined separated layer fracturing, grouping and layer-combining mining method for coal bed well group | |
| CN105003237A (en) | Apparatus and method for integrated processing of natural gas hydrate exploitation by geothermy and waste CO2 reinjection | |
| US10989036B2 (en) | Drilling casing and method of performing fast drilling and completion of large-borehole multilateral well | |
| CN110318674B (en) | Method for preventing outburst caused by cracking of roadway roof | |
| CN207554023U (en) | Hydrate recovery well cased hole gravel packing analogue system | |
| CN103195468A (en) | System process for conducting efficient strengthened extraction in surrounding rock | |
| CN112282707B (en) | Sea natural gas hydrate barrel type mining device and method thereof | |
| CN112343557B (en) | Sea area natural gas hydrate self-entry type exploitation device and exploitation method | |
| CN112065354A (en) | Modification process of perforation fracturing structure under offshore loose sandstone sieve tube well completion mode | |
| CN113294126A (en) | Natural gas hydrate combined mining method and device for stabilizing stratum | |
| CN103362117A (en) | Full-section grouting method for grouting section | |
| CN112302578B (en) | Method for exploiting structural coal bed gas by horizontal well stress release | |
| CN106437823B (en) | Method for eliminating outburst and standard exceeding of coal mine gas explosion | |
| CN112253070B (en) | Method for sectional seam making, coal washing and outburst elimination of thick coal seam top-bottom linkage horizontal well | |
| WO2018171067A1 (en) | Mining system of marine non-diagenetic natural gas hydrate reservoir and mining process thereof | |
| CN204294863U (en) | A kind of low-density coated sand | |
| CN112343560A (en) | Fracturing and sand prevention combined process method for exploiting low-permeability reservoir natural gas hydrate | |
| CN107288606B (en) | Method for artificially building hot dry rock thermal reservoir |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |