CN105298463B - Gas hydrates big well multiple-limb radially horizontal well completion method - Google Patents
Gas hydrates big well multiple-limb radially horizontal well completion method Download PDFInfo
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- CN105298463B CN105298463B CN201510766291.XA CN201510766291A CN105298463B CN 105298463 B CN105298463 B CN 105298463B CN 201510766291 A CN201510766291 A CN 201510766291A CN 105298463 B CN105298463 B CN 105298463B
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- 150000004677 hydrates Chemical class 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000004064 recycling Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 12
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 12
- 239000013530 defoamer Substances 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 239000012744 reinforcing agent Substances 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- YIBPLYRWHCQZEB-UHFFFAOYSA-N formaldehyde;propan-2-one Chemical compound O=C.CC(C)=O YIBPLYRWHCQZEB-UHFFFAOYSA-N 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- -1 polyoxyethylene Polymers 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 238000006277 sulfonation reaction Methods 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 6
- 230000000704 physical effect Effects 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 3
- MDFFNEOEWAXZRQ-UHFFFAOYSA-N aminyl Chemical compound [NH2] MDFFNEOEWAXZRQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- 235000002906 tartaric acid Nutrition 0.000 claims description 3
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 150000001413 amino acids Chemical class 0.000 claims description 2
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 235000005979 Citrus limon Nutrition 0.000 claims 1
- 244000248349 Citrus limon Species 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 230000005465 channeling Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 239000004570 mortar (masonry) Substances 0.000 abstract description 2
- 230000008719 thickening Effects 0.000 abstract description 2
- 239000003673 groundwater Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 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 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000000565 sealant Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 125000003275 alpha amino acid group Chemical group 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013000 chemical inhibitor Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004459 forage Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
- E21B7/185—Drilling by liquid or gas jets, with or without entrained pellets underwater
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of gas hydrates big well multiple-limb radially horizontal well completion method.Its technical scheme is: include that using large scale drill bit to be disposably drilled into purpose well depth forms big main borehole, recycling radially horizontal well technology gets out multiple horizontal branch well in gas hydrates reservoir, farthest increases the contact surface area of reservoir and well.Provide the benefit that: avoid or down hole problem during exploitation reducig, and the quantity of branch well hole can be increased substantially；Multiple-limb radial level well increases bare area and the degree of depth of gas hydrates to greatest extent, increases substantially recovery ratio, and reduces well spacing quantity, reduces development investment；The window aperture seal agent used, namely mortar architecture is stable, and strength development is fast, and the thickening time is adjustable, can effectively prevent hydrate layer from sealing shallow seated groundwater has channeling, have good workability.
Description
Technical field
The present invention relates to a kind of Unconventional forage engineering field, particularly to a kind of many points of big well of gas hydrates
Prop up radially horizontal well completion method.
Background technology
Gas hydrates are distributed mainly in deep sea shallow surface sediments, by natural gas and water shape under the conditions of high pressure low temperature
The crystalline material of class ice-like become, because its outward appearance and meets fire i.e. incendivity as ice, so also referred to as " combustible ice " or
Person's " solid gas " and " gas ice ".Its stock number is equivalent to the 2 of the whole world fossil fuel resource amount summation such as coal, oil and natural gas
Times.Gas hydrates are acknowledged as the important alternative energy with good prospect, and it has, and distribution is wide, stock number is big, energy
The advantages such as metric density is high and pollution-free.Since the 80's of 20th century, many countries are all in terms of the research of gas hydrates
Give and pay much attention to, and considering from energy strategy angle, having formulated long term growth planning one after another.
The fundamental property of gas hydrates and the tax mode of depositing determine it and conventional gas and oil recovery method cannot be used to open
Adopt.The basic ideas of current natural gas hydrate exploitation are to hide at hydrate to be drilled to single well (straight well or horizontal well), then
By thermal excitation, it is depressured, notes chemical inhibitor and make gas hydrate dissociation become free gas with methods such as gas displacements, and ooze
Flow to pit shaft exploit.Owing to decomposition of hydrate process is slow, cause hydrate well well yield limited.How to improve individual well
Yield, is to determine that can hydrate the key of effective exploitation.
Hiding residing physical environment due to hydrate is deep water, shallow-layer, is likely to be of stratum poor diagenetic grade, formation strength, oozes
The new features such as saturating rate variance (hydrate solidification is caused), make conventional hydraulic fracturing yield increasing technology cannot meet the need of hydrate exploitation
Want.
Through the retrieval of domestic and international existing technical patent document is found, there is presently no gas hydrates completion skill
The patent that art is relevant.Present applicant proposes a kind of new completion method improving well yield.
Summary of the invention
The purpose of the present invention is aiming at the drawbacks described above that prior art exists, it is provided that a kind of big well of gas hydrates
Multiple-limb radially horizontal well completion method, the method uses large scale drill bit to be disposably drilled into purpose well depth and forms main borehole, then
Utilize radially horizontal well technology to get out multiple horizontal branch well in reservoir, farthest increase contacting of reservoir and well
Surface area.This completion method is applicable to various gas hydrates and excites isolation (heat injection, noteization, be depressured and replace), energy
Enough increase substantially hydrate well yield and recovery ratio.
Its technical scheme is: include that using large scale drill bit to be disposably drilled into purpose well depth forms big main borehole (5), then profit
In gas hydrates reservoir, get out multiple horizontal branch well (6) by radially horizontal well technology, specifically comprise the following steps that
(1) after big main borehole (5) operation completes, whipstock (21) under lower going-into-well, package unit is fixed on shaft bottom sleeve pipe
On；
(2) enter deflecting guider (9) under, insert the hole, location of the gathering sill (23) of first horizontal branch well (6)
(22), in, simultaneously entering under high-voltage flexible jet pipe to guide in follow-up screen casing (10), guide follow-up screen casing (10) front end and height is installed
Pressure jet bit (12), the thrust by self gravitation and high-pressure injection drill bit (12) creeps into forward；
(3) when creeping into desired depth, under enter the Electrochemical Cutting device of tape cable to high-voltage flexible jet pipe and high-pressure injection
Drill bit (12) junction, is then pumped into the KCl aqueous solution, uses powered by direct current that high-voltage flexible jet pipe is carried out Electrochemical Cutting,
Withdraw from upper pipeline, high-pressure injection drill bit (12) and guiding follow-up screen casing (10) are stayed in well, it is achieved a radial level
Well completion practice；
(4), after, flexible pipe in place in radial branching wellbore screen reclaims, under lower going-into-well, separating device (19), set radial well
Head tube external packer, separating device (19) under closed-in well, close branch well hole temporarily；
(5) by drilling tool down near window, first use huge discharge circulation well cleanup, then squeezed by the clear water examination of well cementation pump, understand
Formation absorption situation；
(6) window aperture seal agent well cementation pump good for mixture in the tank car of ground is pumped in well, after cement mortar goes out drilling tool,
I.e. close well head, replace cement mortar with small displacement circulating fluid and clamp-on to stratum, rise to close to formation fracture pressure in pump pressure
Stopping during power, open well head, after drilling tool lift-off window, superfluous water mud is recycled well head, be then shut off and build the pressure time
Solidifying, pressure size is identical with pressure during termination of pumping；
(7), after completing to enter under a radial direction well completion tubular column, adjust guider orientation, carry out next radial direction well
Operation；
(8) repeat 2 ~ 7 steps and be sequentially completed the construction of remaining horizontal hole.
The above-mentioned window aperture seal agent in step (six), is made up of the component of following weight portion: G level oil-well cement 100 parts,
Reinforcing agent 20 ~ 30 parts, cenosphere 5 ~ 70 parts, early strength agent 3 parts, dispersant 1 part, retarder 0.4 ~ 3 part, defoamer 1 part, fall are lost
3.5 ~ 4 parts of aqua, 57 ~ 100 parts of water；Wherein reinforcing agent is ultrafine slag or flyash, and early strength agent is Ca (NO3)2Or KAl
(SO4)2；Dispersant is sulfonation formaldehyde-acetone condensation polymer or amino acid sulfonation formaldehyde-acetone condensation polymer；Retarder is tartaric acid
Or citric acid；Defoamer is the one in dimethyl silicone polymer, tributyl phosphate and polyoxyethylene polyoxy propyl alcohol amidogen ether；Fall is lost
Aqua is the one in hydroxyethyl cellulose or carboxymethyl hydroxyethyl cellulose.
Above-mentioned down-hole whipstock (21) include position hole (22), gathering sill (23), fixator (24), support arm (25),
Fixed pedestal (26), central platform (27), central platform (27) is disc-shaped structure, central platform (27) be formed around many
Group gathering sill (23), gathering sill (23) is provided with hole, location (22)；The bottom of described central platform (27) connects fixed pedestal
(26), fixed pedestal (26) be formed around multiple support arm (25), the outer end of described support arm (25) is provided with fixator
(24).
Above-mentioned central platform (27) outer wall is provided with arc notch (13).
The physical property of above-mentioned ultrafine slag is: fineness≤10%, specific surface area >=350m2/ Kg, sulfur trioxide≤
4.0%；The physical property of described flyash is: fineness≤20%, sulfur trioxide≤3.0%.
Relative to prior art, the present invention has a following beneficial effect:
(1) big well is that the various modern brill completion technique enforcement in down-hole provides favourable condition, it is to avoid or reduce
Down hole problem in recovery process, and the quantity of branch well hole can be increased substantially；
(2) multiple-limb radial level well increases bare area and the degree of depth of gas hydrates to greatest extent, greatly
Amplitude improves recovery ratio, and reduces well spacing quantity, reduces development investment；
(3) radially horizontal well uses high-pressure water jet to replace mechanical drill to break rock and gets out horizontal hole, need not when creeping into
Drill string and the rotation of drill bit, decrease the generation of down-hole complex accident；Advance by fluid pressure, it is not necessary to by drilling rod to drill bit
Apply " the pressure of the drill " in order to broken rock, thus thoroughly solve the pressure of the drill applying difficulty that conventional levels well drilling technology is run into；Adopt
With specially designed down-hole whipstock, accurate positioning, disposably orient, it is to avoid the horizontal well drilling technology of conventional various curvature
The technical process such as the hole trajectory control of required frequent deflecting, orientation and complexity, and can guarantee that net horizontal section enters exactly
Enter target zone；
(4) the window aperture seal agent used, namely mortar architecture is stable, and strength development is fast, and the thickening time is adjustable, can have
Effect prevents hydrate layer from sealing shallow seated groundwater-has channeling, has good workability.
Accompanying drawing explanation
Accompanying drawing 1 is the overall schematic of the present invention；
Accompanying drawing 2 is the top view of main borehole and horizontal branch well；
Accompanying drawing 3 is the schematic diagram of drill string assembly；
Accompanying drawing 4 is the schematic diagram of downhole tool combination；
Accompanying drawing 5 is branch's radial level well completion schematic diagram；
Accompanying drawing 6 is the profile of down-hole whipstock；
Accompanying drawing 7 is the top view of down-hole whipstock；
In upper figure: seawater 1, upper country rock 2, gas hydrates reservoir 3, lower country rock 4, big main borehole 5, radially horizontal well 6,
Down-hole fixing device 7, sleeve pipe 8, deflecting guider 9, guiding follow-up screen casing 10, the horizontal well borehole wall 11, high-pressure injection drill bit 12, arc
V notch v 13, cement sheath 14, packer 15；
Separator 19, vertical boreholes 20, down-hole whipstock 21, location hole 22, gathering sill 23, fixator 24, support arm 25,
Fixed pedestal 26, central platform 27, arc notch 28.
Detailed description of the invention
Embodiment 1: combining accompanying drawing 1-7, the invention will be further described:
The present invention includes that using large scale drill bit to be disposably drilled into purpose well depth forms big main borehole 5, recycles radial water
Horizontal well technology gets out multiple horizontal branch well 6 in gas hydrates reservoir, specifically comprises the following steps that
After one big main borehole 5 operation completes, whipstock 21 under lower going-into-well, package unit is fixed on the sleeve pipe 8 in shaft bottom；
Enter deflecting guider 9 for two times, in the hole, location 22 of the gathering sill 23 inserting first horizontal branch well 6, simultaneously
Entering to guide in follow-up screen casing 10 under high-voltage flexible jet pipe, guide follow-up screen casing 10 front end and high-pressure injection drill bit 12 is installed, borrow
The thrust helping self gravitation and high-pressure injection drill bit 12 creeps into forward；
Three when creeping into desired depth, under enter the Electrochemical Cutting device of tape cable and bore with high-pressure injection to high-voltage flexible jet pipe
12 junctions, are then pumped into the KCl aqueous solution, use powered by direct current that high-voltage flexible jet pipe is carried out Electrochemical Cutting, withdraw from
Upper pipeline, stays in well by high-pressure injection drill bit 12 and guiding follow-up screen casing 10, it is achieved a radially horizontal well completion is made
Industry；Above-mentioned Electrochemical Cutting device is existing known devices, no longer describes in detail；
After four in place in radial branching wellbore screen, flexible pipe reclaims, separating device 19 under lower going-into-well, set radial well top
External packer of pipe, separating device 19 under closed-in well, close branch well hole temporarily；
Five by drilling tool down near window, first use huge discharge circulation well cleanup, then squeezed by the clear water examination of well cementation pump, understand ground
Layer absorbing state；
Window aperture seal agent well cementation pump good for mixture in the tank car of ground is pumped in well, after cement mortar goes out drilling tool, i.e. by six
Close well head, replace cement mortar with small displacement circulating fluid and clamp-on to stratum, rise to close to formation fracture pressure in pump pressure
Time stop, opening well head, after drilling tool lift-off window 150m, superfluous water mud recycled well head, be then shut off and build the pressure time
Solidifying, pressure size is identical with pressure during termination of pumping；
After seven complete to enter under a radial direction well completion tubular column, adjust guider orientation, carry out the work of next radial direction well
Industry；
Multiple 2 ~ 7 steps of eightfold are sequentially completed the construction of remaining horizontal hole.
Window aperture seal agent in above-mentioned step 6, for the specific condition of natural gas hydrate stratum, it is desirable to sealant
Meet following requirements: 1. sealant density is low；2. cryogenic conditions is short high with compression strength for lower transit time；3. fluid loss is low；④
Integrity of sealant is good；5. sealant and sleeve pipe and the packing on stratum and cementing time are long；
This window aperture seal agent is made up of the component of following weight portion: G level oil-well cement 100 parts, reinforcing agent 20 parts, hollow micro-
5 parts of pearl, early strength agent 3 parts, dispersant 1 part, retarder 0.4 part, defoamer 1 part, fluid loss agent 3.5 parts, 57 parts of water, density 1.2 ~
1.7g/cm-3；Wherein reinforcing agent is ultrafine slag, and the physical property of above-mentioned ultrafine slag is: fineness≤10%, specific surface area >=
350m2/ Kg, sulfur trioxide≤4.0%；Early strength agent is Ca (NO3)2；Dispersant is sulfonation formaldehyde-acetone condensation polymer, average molecular
Quality is 8000 ~ 60000；Retarder is tartaric acid；Defoamer is dimethyl silicone polymer；Fluid loss agent is hydroxy ethyl fiber
Element, when 25 DEG C, the viscosity of 2% aqueous solution is 7000 ~ 12000mPa s；This window aperture seal agent, namely cement slurry system is steady
Fixed, the special circumstances of natural gas hydrate stratum can be met, also can effectively prevent hydrate layer from sealing shallow seated groundwater-has channeling, tool
There is good workability.
Above-mentioned down-hole whipstock 21 include position hole 22, gathering sill 23, fixator 24, support arm 25, fixed pedestal 26,
Central platform 27, central platform 27 is disc-shaped structure, is formed around organizing gathering sill 23, gathering sill 23 at central platform 27 more
It is provided with hole 22, location；The bottom of described central platform 27 connects fixed pedestal 26, and being formed around of fixed pedestal 26 is multiple
Support arm 25, the outer end of described support arm 25 is provided with fixator 24；Above-mentioned central platform 27 outer wall is provided with arc notch 13.
The down-hole whipstock accurate positioning that the present invention mentions, disposably orients, it is to avoid the horizontal well drilling technology of conventional various curvature
The technical process such as the hole trajectory control of required frequent deflecting, orientation and complexity, and can guarantee that net horizontal section enters exactly
Enter target zone.
Embodiment 2, difference from Example 1 is the window aperture seal agent used, and is made up of the component of following weight portion: G
Level oil-well cement 100 parts, reinforcing agent 30 parts, cenosphere 70 parts, early strength agent 3 parts, dispersant 1 part, retarder 3 parts, defoamer 1
Part, fluid loss agent 4 parts, 100 parts of water, density 1.2 ~ 1.7g/cm-3；Wherein reinforcing agent is that the physical property of flyash is: fineness≤
20%, sulfur trioxide≤3.0%；Early strength agent is KAl (SO4)2；Dispersant is amino acid sulfonation formaldehyde-acetone condensation polymer, relatively divides
Protonatomic mass is 8000 ~ 60000；Retarder is citric acid；Defoamer is tributyl phosphate；Fluid loss agent is that carboxy methyl hydroxyethyl is fine
One in dimension element, when 25 DEG C, the viscosity of 2% aqueous solution is 7000 ~ 12000mPa s.This window aperture seal agent, namely cement water
Mud system is stable, can meet the special circumstances of natural gas hydrate stratum, also can effectively prevent hydrate layer from sealing shallow-layer
Water-has channeling, has good workability.
Embodiment 3, difference from Example 1 is the window aperture seal agent used, and is made up of the component of following weight portion: G
Level oil-well cement 100 parts, reinforcing agent 25 parts, cenosphere 40 parts, early strength agent 3 parts, dispersant 1 part, retarder 2 parts, defoamer 1
Part, fluid loss agent 3.7 parts, 80 parts of water；Wherein reinforcing agent is ultrafine slag, and early strength agent is KAl (SO4)2；Dispersant is amino acid
Sulfonation formaldehyde-acetone condensation polymer；Retarder is citric acid；Defoamer is polyoxyethylene polyoxy propyl alcohol amidogen ether；Fluid loss agent is hydroxyl
Ethyl cellulose, when 25 DEG C, the viscosity of 2% aqueous solution is 7000 ~ 12000mPa s.
This window aperture seal agent, namely cement slurry system is stable, can meet the special of natural gas hydrate stratum
Situation, also can effectively prevent hydrate layer from sealing shallow seated groundwater-has channeling, have good workability.
The above, be only the part preferred embodiment of the present invention, and any those of ordinary skill in the art all may profit
Revised or be revised as the technical scheme of equivalent by the technical scheme of above-mentioned elaboration.Therefore, according to the technology of the present invention
Any simple modification that scheme is carried out or substitute equivalents, belong to the greatest extent the scope of protection of present invention.
Claims (4)
1. a gas hydrates big well multiple-limb radially horizontal well completion method, including using, large scale drill bit is disposable
It is drilled into purpose well depth and forms big main borehole (5), it is characterized in that: recycling radially horizontal well technology is in gas hydrates reservoir
Get out multiple horizontal branch well (6), specifically comprise the following steps that
(1) after big main borehole (5) operation completes, whipstock (21) under lower going-into-well, package unit is fixed on the sleeve pipe of shaft bottom；
(2) enter deflecting guider (9) under, insert the hole, location (22) of the gathering sill (23) of first horizontal branch well (6)
In, simultaneously entering under high-voltage flexible jet pipe to guide in follow-up screen casing (10), guide follow-up screen casing (10) front end and high pressure spray is installed
Penetrating drill bit (12), the thrust by self gravitation and high-pressure injection drill bit (12) creeps into forward；
(3) when creeping into desired depth, under enter the Electrochemical Cutting device of tape cable to high-voltage flexible jet pipe and high-pressure injection drill bit
(12) junction, is then pumped into the KCl aqueous solution, uses powered by direct current that high-voltage flexible jet pipe is carried out Electrochemical Cutting, withdraws from
Upper pipeline, stays in well by high-pressure injection drill bit (12) and guiding follow-up screen casing (10), it is achieved a radially horizontal well is complete
Well operations；
(4) after, pipeline in place in guiding follow-up screen casing (10) reclaims, separating device (19) under lower going-into-well, set radial well top
External packer of pipe (15), separating device (19) under closed-in well, close branch well hole temporarily；
(5) by drilling tool down near window, first use huge discharge circulation well cleanup, then squeezed by the clear water examination of well cementation pump, understand stratum
Absorbing state；
(6) window aperture seal agent well cementation pump good for mixture in the tank car of ground is pumped in well, after cement mortar goes out drilling tool, i.e. close
Close well head, replace cement mortar with small displacement circulating fluid and clamp-on to stratum, when pump pressure rises to close to formation fracture pressure
I.e. stop, opening well head, after drilling tool lift-off window, superfluous water mud is recycled well head, be then shut off and the time that builds the pressure is solidifying, pressure
Power size is identical with pressure during termination of pumping；
(7), after completing to enter under a radial level well completion tubular column, adjust guider orientation, carry out next radially horizontal well
The operation of eye；
(8) repeat 2 ~ 7 steps and be sequentially completed the construction of remaining horizontal hole；
The described window aperture seal agent in step (six), is made up of the component of following weight portion: G level oil-well cement 100 parts, enhancing
Agent 20 ~ 30 parts, cenosphere 5 ~ 70 parts, early strength agent 3 parts, dispersant 1 part, retarder 0.4 ~ 3 part, defoamer 1 part, fluid loss agent
3.5 ~ 4 parts, 57 ~ 100 parts of water；Wherein reinforcing agent is ultrafine slag or flyash, and early strength agent is Ca (NO3)2Or KAl (SO4)2；
Dispersant is sulfonation formaldehyde-acetone condensation polymer or amino acid sulfonation formaldehyde-acetone condensation polymer；Retarder is tartaric acid or lemon
Acid；Defoamer is the one in dimethyl silicone polymer, tributyl phosphate and polyoxyethylene polyoxy propyl alcohol amidogen ether；Fluid loss agent is
One in hydroxyethyl cellulose or carboxymethyl hydroxyethyl cellulose.
Gas hydrates the most according to claim 1 big well multiple-limb radially horizontal well completion method, is characterized in that:
Described down-hole whipstock (21) includes positioning hole (22), gathering sill (23), fixator (24), support arm (25), fixed pedestal
(26), central platform (27), central platform (27) is disc-shaped structure, central platform (27) be formed around organize gathering sill more
(23), gathering sill (23) is provided with hole, location (22)；The bottom of described central platform (27) connects fixed pedestal (26), fixing
Pedestal (26) be formed around multiple support arm (25), the outer end of described support arm (25) is provided with fixator (24).
Gas hydrates the most according to claim 2 big well multiple-limb radially horizontal well completion method, is characterized in that:
Described central platform (27) outer wall is provided with arc notch (13).
Gas hydrates the most according to claim 1 big well multiple-limb radially horizontal well completion method, is characterized in that:
The physical property of described ultrafine slag is: fineness≤10%, specific surface area >=350m2/ Kg, sulfur trioxide≤4.0%；Described
The physical property of flyash is: fineness≤20%, sulfur trioxide≤3.0%.
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| CN106761587B (en) * | 2016-11-18 | 2018-04-20 | 青岛海洋地质研究所 | Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method |
| CN106837259B (en) * | 2017-04-01 | 2023-02-17 | 吉林大学 | Device and method for increasing yield of marine shallow natural gas hydrate microtubules |
| CN107620582B (en) * | 2017-08-08 | 2018-08-03 | 广州海洋地质调查局 | Bilayer sleeve sand control completion technique and double-layer anti-sand completion tubular column |
| CN107701151A (en) * | 2017-11-17 | 2018-02-16 | 中国矿业大学 | A kind of method of directional drilling decompression extraction gas hydrates |
| CN108005626B (en) * | 2017-11-27 | 2020-11-24 | 华南理工大学 | Natural gas hydrate exploitation device and method based on heat pipe technology |
| CN108086958B (en) * | 2017-12-08 | 2020-01-31 | 中国矿业大学 | Hydrogen-oxygen replacement coordinated exploitation method for natural gas hydrate freezing well cementation |
| CN108104776B (en) * | 2017-12-12 | 2019-10-29 | 大连理工大学 | A kind of water erosion method exploiting ocean natural gas hydrates device of combination decompression |
| CN108894765A (en) * | 2018-08-24 | 2018-11-27 | 广州海洋地质调查局 | The major-minor well construction and its method of deep water shallow layer gas hydrate exploitation |
| CN109611086B (en) * | 2018-12-06 | 2019-11-05 | 青岛海洋地质研究所 | The monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well |
| CN109488259B (en) * | 2018-12-12 | 2019-08-06 | 青岛海洋地质研究所 | It is handled up the method for replacement exploitation I class hydrate system based on warm seawater-gravel |
| CN109736769A (en) * | 2019-01-15 | 2019-05-10 | 中国矿业大学 | A kind of frozen soil layer gas hydrates horizontal branch well pattern mining system and method |
| CN110029968B (en) * | 2019-04-08 | 2020-02-14 | 中国石油大学(华东) | Device for drilling hydrate micro well and quickly completing well and working method |
| CN110159233B (en) * | 2019-06-10 | 2021-07-23 | 中国石油大学(华东) | Method for improving natural gas hydrate reservoir recovery ratio through artificial dense cover layer |
| CN110657594A (en) * | 2019-10-08 | 2020-01-07 | 刘联军 | Closed circulation deep geothermal energy exploitation system |
| CN114075949B (en) * | 2020-08-21 | 2024-04-05 | 中国石油化工股份有限公司 | Vertical well development method of natural gas hydrate |
| CN115217446B (en) * | 2021-04-21 | 2024-03-29 | 中石化石油工程技术服务有限公司 | Resource exploitation method and device |
| CN114135291B (en) * | 2021-11-22 | 2022-12-27 | 大连理工大学 | Laying and recycling system of deep-sea mining test system and using method |
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| CN1508380A (en) * | 2002-12-18 | 2004-06-30 | 杜晓瑞 | Method and device for drilling and completing ultra-short curvature horizontal well |
| RU2306410C1 (en) * | 2005-12-22 | 2007-09-20 | Государственное образовательное учреждение высшего профессионального образования Российский государственный университет нефти и газа им. И.М. Губкина | Method for thermal gaseous hydrate field development |
| CN1944949A (en) * | 2006-08-09 | 2007-04-11 | 中国石油大学(华东) | Method for recovering sea bottom hydrate by single well heat injection circulation |
| CN102493794B (en) * | 2011-12-13 | 2017-11-21 | 王建生 | Mixing wastewater with air liquid jet drilling is quincunx radially horizontal well coal bed methane exploring method |
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| CN104533287B (en) * | 2014-11-20 | 2017-03-08 | 西南石油大学 | A kind of fish spicule shape multilevel branch horizontal well shale gas reservoir that bores is drilled well and stimulation system |
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