CN106337667A - Secondary-exploitation horizontal well cementing and completion construction method - Google Patents
Secondary-exploitation horizontal well cementing and completion construction method Download PDFInfo
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- CN106337667A CN106337667A CN201610854598.XA CN201610854598A CN106337667A CN 106337667 A CN106337667 A CN 106337667A CN 201610854598 A CN201610854598 A CN 201610854598A CN 106337667 A CN106337667 A CN 106337667A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 17
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 54
- 230000009467 reduction Effects 0.000 claims description 50
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 239000011083 cement mortar Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 18
- 238000003801 milling Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 8
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 16
- 239000004568 cement Substances 0.000 abstract description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 abstract description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 abstract description 2
- 239000001103 potassium chloride Substances 0.000 abstract 2
- 235000011164 potassium chloride Nutrition 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 11
- 210000003128 head Anatomy 0.000 description 11
- 238000011161 development Methods 0.000 description 10
- 230000018109 developmental process Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000009466 transformation Effects 0.000 description 8
- 241001074085 Scophthalmus aquosus Species 0.000 description 7
- 230000035515 penetration Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000004899 motility Effects 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009897 systematic effect 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
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a second horizontal well cementing and completion construction method, which belongs to the technical field of drilling engineering and comprises the following steps: s1, drilling a 346mm drill bit to the well depth of 750 meters; s2, drilling the second-cut straight well section to the well depth of 2850 meters by using a drill bit with the thickness of 222mm, and drilling the second-cut inclined well section and the horizontal section to a full well by using a drill bit with the thickness of 215.9 mm; s3, dredging a well; s4, setting a second horizontal well cementing and completion integrated pipe column device; s5, grouting slurry; s6, annotate 25m3The cement slurry of (1); s7, annotate 5m3Clear water, 2m3The sodium carboxymethylcellulose spacer fluid; s8, annotate 25-30m3Replacing the slurry with potassium chloride solution, and putting one seating ball with the diameter of 41.3 mm; s9 Note 60m3A potassium chloride solution; and S10, electrically measuring the well cementation quality. The invention can carry out track adjustment with larger amplitude, has strong flexibility, small difficulty of well cementation construction and low well cementation cost.
Description
Technical field
The present invention relates to drilling engineering technical field, more particularly, to a kind of two boiled water horizontal wells completion construction method admittedly.
Background technology
Drilling well in oil-gas mining mainly includes creeping into engineering and Well Completion Engineering of Oil Reservoirs.Drilling engineering is exactly to be drilled into from spudding in to survey
Visit exploitation target zone, be drilled the drilling process of full well drilling depth.Spud in, refer to down first drill bit after conduit or each layer sleeve pipe
Start to creep into.Drilling can be divided into spuds in, spuds in for the second time, spudding in for the third time for the first time.A bite well from well depth be zero start bore
Enter, claim to spud in for the first time, referred to as one opens；Spud in again after surface pipe well cementation, claim to spud in for the second time, referred to as two open；Technology set
Pipe spuds in after having cemented the well again, claims third time to spud in, referred to as three open；As protective casing have two-layer, three layers, then also have four open, five
Open.Drilling engineering to the effect that: drilling make a trip, drilling and coring delivery, and in drilling well with well cementation, well logging, well logging and the borehole wall
Core, the cooperating of drillstem test.Drilling fluid, pipe, the technical service of Special Drilling Operation are through the overall process crept into.Drilling
Engineering is the major project of drilling well, its engineering technology level and quality, and each correlation work post, technical service, each link of drilling well
The coordination linking cooperation of work, is safety drilling, shortens drilling period, reduce material consumption, determine engineering cost height and survey
Visit the key of returns of investment height.
One open specifically include that brill top layer, layer sleeve pipe, well cementation；Dress well head；Pressure testing；The installation of blowout control equipment.Two open master
Including: drilling；Drillstem test；Under enter protective casing and cement the well.Three open and specifically include that installation well head, pressure testing；Drilling, brill leaves
Oil-gas Layer；Completion logging；Lower production casing is simultaneously cemented the well.Well Completion Engineering of Oil Reservoirs is from the beginning of oil reservoir left by brill, to setting of casing cementing well,
Perforation, lower flow string, discharge opeing, until the systematic engineering of business gone into operation.Major project content is: completion logging, sidewall coring,
The production strings such as setting of casing, cementing are cemented the well, survey sound width, pressure testing, dress wellhead assembly etc..The operations such as completion phase well logging, test
Project is many, and consumption of materials is big, and expense generation is many, and the particularly cased hole of multilamellar can make drilling cost at double or several times
Raise.Completion is also down-hole complexity and Frequent Accidents stage, and the quality of particularly cementing quality is directly connected to the one-tenth of a bite well
Work(and failure.
At present, horizontal well is many spuds in into mode using three.The horizontal well development implemented at present, horizontal section length is from 600 meters
To 3056 meters, wherein most well horizontal segments, in 1000-1500 rice, going deep into development process, can arrange longer level
The Favorable Zones of section tail off, and in order to effectively employ, class reservoir, realize the purpose of cost efficiency, main arrangement 400-600 rice
Short horizontal segment well reservoir because horizontal segment is longer, the technical barrier running into will be more.Spud in into the level of mode using three
Well, wherein two exploitations are cemented the well at the initiating terminal of horizontal segment with entering under 7 inches of sleeve pipes, and three exploitations complete horizontal segment with 6 inch drill bit
Drilling, completion using under enter 5 inches of casing cementings or under enter the combination of 3.5 inches of open hole packers, then reservoir is implemented after transformation
Go into operation.Three spud in into mode: in existing, the complete time is long, bore completion period length, reservoir reconstruction cycle length, because completion tubular column size little
Factor limit it is impossible to reservoir is implemented with the transformation of extensive spatial cuboids depth, limited by reservoir reconstruction effect, development cost
Height, meanwhile, because completion tubular column size is little, cannot implement well workover, water blockoff, refracturing transformation etc. in the later stage produces to horizontal segment
Technological measure, is unfavorable for economy, the Efficient Development of horizontal well.
Publication No. cn 105587309a, publication date is that the Chinese patent literature of on 05 18th, 2016 discloses one kind
The boring method of horizontal well is it is characterised in that described boring method comprises the following steps: s1, detects magnetic declination value and well rail
Trace displacement value；S2, eliminates the impact to described well track deviant for the described magnetic biasing angle value using mwd system, obtains drill bit and return
Return track；S3, returns trajectory corrector drill bit drilling direction according to described drill bit；S4, continues drilling well using described drill bit.
The boring method of horizontal well disclosed in this patent documentation, by eliminating error and the multiple rectification brill that magnetic declination causes
Head drilling direction is it is achieved that wellbore trace and the preferable coincidence factor of desired trajectory.But, horizontal segment wellbore construction be front once
After well cementation start, bit size little than lower curved section differential it is impossible to realize lower curved section and the big bradawl of horizontal segment same size
Head carries out drillng operation；When reservoir inclination angle, reservoir properties occur large change when, can only be adjusted in a small range it is impossible to
Flexibly enter the larger track adjustment of line amplitude.
Content of the invention
The present invention, in order to overcome the defect of above-mentioned prior art, provides a kind of two boiled water horizontal wells solid completion construction method, this
Invent same drill bit and can complete two and open the drilling that lower curved section and two opens horizontal segment, when reservoir inclination angle, reservoir properties occur larger
During change, because annular clearance is larger, adjust so as to enter the larger track of line amplitude, motility is strong, and cementing operation difficulty is little,
Well cementation low cost.
The present invention is achieved through the following technical solutions:
The solid completion construction method of one kind two boiled water horizontal wells is it is characterised in that comprise the following steps:
S1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, and then entering down external diameter is the oval of 273mm
Button casing cementing；
S2, two open straight well section adopt external diameter be 222mm drill bit, be drilled into 2850 meters of well depth, two open lower curved section and horizontal segment
Full well finishing drilling is got to using the drill bit for 215.9mm for the external diameter；
S3, on drilling tool, order milling post and the solid completion integral tubular column unit of double milling post simulation two boiled water horizontal wells are led to
Well, the well the getting out borehole wall is repaired smooth, by place expansion little for borehole diameter；
After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；
S5, flushing ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3
Cement mortar neck slurry；
S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.85-1.92kg/m3；
S7, after 1 minute, be implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject
3m3Clear water；
S8, after 1 minute, be implanted sequentially 25-30m3Klorvess Liquid replace mud, described Klorvess Liquid concentration
For 4%；Injection 2m3Sodium carboxymethyl cellulose insulating liquid, after 1 minute elapsed time, throw a diameter of 41.3mm setting ball one
Individual；
S9, continuation injection 60m3Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place,
Now cement mortar bottom has reached more than the initiating terminal of horizontal segment；Continue injection Klorvess Liquid, all open hole packers are whole
One-shot, realizes sealing；
Solidifying 48 hours of s10, time, open pressure reduction sliding sleeve, electrical measurement cementing quality.
Described two boiled water horizontal wells completion integral tubular column unit admittedly, the tubing string including sleeve pipe, being located in sleeve pipe, tubing string are from upper
To under be made up of vertical section, tilting section and horizontal segment, the pitching sliding sleeve that is arranged on horizontal segment, pressure reduction sliding sleeve, open hole packer
And float shoe, also include float collar and self-styled ball seat, open hole packer at least three, set between the adjacent open hole packer of any two
Be equipped with a pitching sliding sleeve, tubing string pass sequentially through from top to bottom float shoe described in screwed connection, float collar, self-styled ball seat, pressure reduction sliding sleeve,
Open hole packer and pitching sliding sleeve.
The external diameter of the pitching sliding sleeve setting gradually from top to bottom along tubing string is identical, and internal diameter is gradually increased.
Described self-styled ball seat includes the ball-and-seat linking together and seat of receiving, and seat of receiving is located at the top of ball-and-seat.
The size of described pressure reduction sliding sleeve is 8.5 inches, and length is 0.94 meter, and external diameter is 177.8 millimeters, Opening pressure and seat
Seal pressure is 38mpa, 149 DEG C of heatproof, and bearing pressure reduction is 70mpa.
In described step s4, drifting is just referring to drilling tool and is above carrying do not block, and transfers non-resistance.
In described step s9, injection pressure is 40mpa.
Beneficial effects of the present invention are mainly manifested in following aspect:
First, the present invention, s1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, and then entering external diameter down is
The oval button casing cementing of 273mm；S2, two open straight well section adopt external diameter be 222mm drill bit, be drilled into 2850 meters of well depth, two open
The drill bit for 215.9mm gets to full well finishing drilling using external diameter for lower curved section and horizontal segment；S3, on drilling tool order milling post and double milling post
Simulate the solid completion integral tubular column unit of two boiled water horizontal wells and carry out drifting, the well the getting out borehole wall is repaired smooth, well is straight
The little local expansion in footpath；After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；s5、
Rinse ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3Cement mortar neck
Slurry；S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.85-1.92kg/m3；S7, through 1 point
Zhong Hou, is implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject 3m3Clear water；S8, through 1
After minute, it is implanted sequentially 25-30m3Klorvess Liquid replace mud, described Klorvess Liquid concentration be 4%；Injection 2m3Carboxylic
Sodium carboxymethylcellulose pyce insulating liquid, after 1 minute elapsed time, throws one, the setting ball of a diameter of 41.3mm；S9, continuation injection 60m3
Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place, now cement mortar bottom has reached water
More than the initiating terminal of flat section；Continue injection Klorvess Liquid, the whole one-shot of all open hole packers, realize sealing；s10、
Wait solidifying 48 hours, open pressure reduction sliding sleeve, electrical measurement cementing quality, the two boiled water horizontal well horizontal segments being formed by above-mentioned steps are the longest can
Reach 1083 meters；Two opened Predicting of Drilling Time In Horizontal Wells for 37.6 days, and the existing three boiled water horizontal wells of ratio reduce 15 days in average 53 days, wellbore construction
Expense reduces more than 1,000,000 yuan；Two boiled water horizontal well Well Development costs decline 25%.Contrast three opening structures, individual well can save set
30 tons of pipe, more than 200,000 yuan of saving sleeve pipe expense；When reservoir inclination angle, reservoir properties occur large change, due to annular clearance
Larger, larger so as to enter line amplitude track adjustment, motility is strong, and cementing operation difficulty is little, low cost of cementing the well；Two open inclined shaft
Using external diameter, the drill bit for 215.9mm gets to full well finishing drilling to section with horizontal segment, and compared with for prior art, rate of penetration improves 15%
More than；And reducing by electrical measurement, setting of casing, a well cementation, average individual well drilling period shortens more than 15 days；Because drilling period reduces,
More than 1,000,000 yuan of drilling cost can be saved；Horizontal segment adopts the drill bit drilling of 215.9mm, and such as down-hole complex situations, because of well
Eye diameter is more much bigger than three eyes that drive a well, and processing means are more, be easier, and can be prevented effectively from security incident.
2nd, the present invention, using the solid completion integral tubular column unit of two boiled water horizontal wells, including float collar and self-styled ball seat, bore hole
Packer at least three, is provided with a pitching sliding sleeve between the adjacent open hole packer of any two, tubing string from top to bottom according to
Secondary by float shoe, float collar, self-styled ball seat, pressure reduction sliding sleeve, open hole packer and pitching sliding sleeve described in screwed connection, wherein, float shoe
Play guiding function；During lower tubular column, the drilling fluid outside pipe is unable in sleeve pipe float collar, is in normal sealing state, but pipe
When the drilling well liquid columnpressure of interior perfusion is higher than toric space head of liquid, in pipe, drilling fluid then can enter ring-like sky by float collar
Between；Self-styled ball seat, had both had single current valve action, simultaneously stacker blocking, assists to realize open hole packer sealing and assists to realize
Pressure reduction sliding sleeve is opened；Pressure reduction sliding sleeve, when in tubing string, pressure is higher than pipe external pressure setting value, pressure reduction sliding sleeve is opened, reservoir reconstruction
When, fracturing fluid just can enter stratum by this passage；Pitching sliding sleeve, forms window, storage for reservoir segmentation is opened with tubing string
During layer transformation, fracturing fluid enters stratum by this window；Open hole packer, for insulating the upper and lower toric space of jacket exterior, will
Horizontal fragmentation separates, and when realizing this section of reservoir fracturing improvement, pressure can not be delivered in other sections, and other horizontal segments are not subject to up and down
Impact；Sleeve pipe, for insulating the open hole bore getting out, forms oil gas flow channel；It is straight after tubing string is lowered into predetermined well depth
Connect cementing well, after cement slurry sets, directly carry out reservoir reconstruction, greatly improve safety；Tubular column unit is total to be taken
And have dropped 40%, pressing crack construction discharge capacity, is greatly shortened it is achieved that transforming to the depth of reservoir up to 10 cubic meters per minute
The reservoir reconstruction engineering time；Correctional effect lifting more than 20%；Transformation reservoir construction pressure break liquid measure is greatly reduced, saves reservoir
Rebuilding construction expense more than 10%；Effectively raise bit speed, shorten brill completion period, reduce development cost, carry
High recovery ratio.
3rd, the present invention, the external diameter of the pitching sliding sleeve setting gradually from top to bottom along tubing string is identical, and internal diameter is gradually increased, when
Setting ball puts in tubing string from well head, drops to when receiving, the external diameter because of setting ball is more than an internal diameter of receiving, and realizes sealing,
When pressure is raised to certain value, that is, when pipe external and internal pressure difference reaches design load, shear pin is cut off, setting ball and receive seat
Descending, window is opened, and realizes the inside and outside connection of pipe；By increasing the internal diameter of pitching sliding sleeve from top to bottom successively along tubing string, can either
Realize good sealing it is also possible to ensure pipe inside and outside connection smoothness.
4th, the present invention, self-styled ball seat includes the ball-and-seat linking together and seat of receiving, and seat of receiving is located at the upper of ball-and-seat
Side, after setting ball receives seat from well head input whereabouts arrival, is capable of good sealing in pipe；Inject liquid in pipe,
Overpressure raises, and when being increased to open hole packer unpacking pressure, open hole packer starts sealing, continues injection liquid, pressure
Power also continues to raise, and when reaching pressure reduction sliding sleeve Opening pressure, pressure reduction sliding sleeve is opened, using this ad hoc structure from blocking
Seat, had both had single current valve action, simultaneously can stacker blocking, can effectively assist to realize open hole packer sealing and assist real
Existing pressure reduction sliding sleeve is opened.
5th, the present invention, the size of pressure reduction sliding sleeve is 8.5 inches, and length is 0.94 meter, and external diameter is 177.8 millimeters, opens pressure
Power and setting pressure are 38mpa, 149 DEG C of heatproof, and bearing pressure reduction is 70mpa, and after putting into setting ball, setting ball reaches and receives
Seat, injects liquid, pressure rise, when reaching certain pressure value, shear pin is cut off, and pressure reduction sliding sleeve is opened, tubing string in pipe
In pipe, toric space outer with pressure reduction sliding sleeve pipe connects, and connects with one section of reservoir of shaft bottom foot, pressure reduction sliding sleeve stability in use
By force.
6th, the present invention, 9.15 ms/h of full well average rate of penetration, 7.9 ms/h of prior art of ratio, improve
15.8%；Open after well cementation compared with by the way of coiled tubing carries underseal instrument pressure break with two, individual well saves the gas testing cycle 8.5
My god, more than 100,000 yuan of individual well saving gas testing cost.
7th, the present invention, greatly improves reservoir reconstruction effect, and pressing crack construction discharge capacity is up to 10 cubic meters per minute, more existing
It is achieved that transforming to the depth of reservoir for technology 4.8 cubic meters per minute, correctional effect lifting more than 20%.
8th, the present invention, contrasts coiled tubing band underseal instrument pressure break, in the case of sand feeding amount is consistent, average individual well can subtract
Few fracturing fluid consumption 340m3, save 170,000 yuan of fracturing fluid expense；Contrast coiled tubing band underseal instrument pressure break mode, in segmentation
Under number the same terms, average individual well can save instrument, acid solution, more than 1,000,000 yuan of crane cost.
Brief description
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the structural representation of the solid completion integral tubular column unit of the present invention two boiled water horizontal well；
Fig. 2 is the structural representation of the self-styled ball seat of the present invention；
In figure labelling: 1, sleeve pipe, 2, tubing string, 3, vertical section, 4, tilting section, 5, horizontal segment, 6, pitching sliding sleeve, 7, pressure reduction slides
Set, 8, open hole packer, 9, float shoe, 10, float collar, 11, self-styled ball seat, 12, ball-and-seat, 13, seat of receiving.
Specific embodiment
Embodiment 1
A kind of two boiled water horizontal wells completion construction method admittedly, comprises the following steps:
S1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, and then entering down external diameter is the oval of 273mm
Button casing cementing；
S2, two open straight well section adopt external diameter be 222mm drill bit, be drilled into 2850 meters of well depth, two open lower curved section and horizontal segment
Full well finishing drilling is got to using the drill bit for 215.9mm for the external diameter；
S3, on drilling tool, order milling post and the solid completion integral tubular column unit of double milling post simulation two boiled water horizontal wells are led to
Well, the well the getting out borehole wall is repaired smooth, by place expansion little for borehole diameter；
After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；
S5, flushing ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3
Cement mortar neck slurry；
S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.85kg/m3；
S7, after 1 minute, be implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject
3m3Clear water；
S8, after 1 minute, be implanted sequentially 25m3Klorvess Liquid replace mud, described Klorvess Liquid concentration is
4%；Injection 2m3Sodium carboxymethyl cellulose insulating liquid, after 1 minute elapsed time, throw a diameter of 41.3mm one, setting ball；
S9, continuation injection 60m3Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place,
Now cement mortar bottom has reached more than the initiating terminal of horizontal segment；Continue injection Klorvess Liquid, all open hole packers 8 are whole
One-shot, realizes sealing；
Solidifying 48 hours of s10, time, open pressure reduction sliding sleeve 7, electrical measurement cementing quality.
The two boiled water horizontal well horizontal segments that formed by above-mentioned steps the longest up to 1083 meters；Two open Predicting of Drilling Time In Horizontal Wells is
37.6 days, than existing three boiled water horizontal wells, average 53 days reduced 15 days, and wellbore construction expense reduces more than 1,000,000 yuan；Two boiled water are put down
Well Well Development cost declines 25%.Contrast three opening structures, individual well can save 30 tons of sleeve pipe, save 200,000 yuan of sleeve pipe expense with
On；When reservoir inclination angle, reservoir properties occur large change, because annular clearance is larger, the rail larger so as to enter line amplitude
Mark adjusts, and motility is strong, and cementing operation difficulty is little, low cost of cementing the well；Two open lower curved section and horizontal segment to adopt external diameter be 215.9mm
Drill bit get to full well finishing drilling, compared with for prior art, rate of penetration improves more than 15%；And reduce an electrical measurement, setting of casing,
Well cementation, average individual well drilling period shortens more than 15 days；Because drilling period reduces, more than 1,000,000 yuan of drilling cost can be saved；Water
Flat section adopts the drill bit drilling of 215.9mm, and complex situations in such as down-hole, because borehole diameter is more much bigger than three eyes that drive a well, processes
Means are more, be easier, and can be prevented effectively from security incident.
Embodiment 2
A kind of two boiled water horizontal wells completion construction method admittedly, comprises the following steps:
S1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, and then entering down external diameter is the oval of 273mm
Button casing cementing；
S2, two open straight well section adopt external diameter be 222mm drill bit, be drilled into 2850 meters of well depth, two open lower curved section and horizontal segment
Full well finishing drilling is got to using the drill bit for 215.9mm for the external diameter；
S3, on drilling tool, order milling post and the solid completion integral tubular column unit of double milling post simulation two boiled water horizontal wells are led to
Well, the well the getting out borehole wall is repaired smooth, by place expansion little for borehole diameter；
After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；
S5, flushing ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3
Cement mortar neck slurry；
S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.9kg/m3；
S7, after 1 minute, be implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject
3m3Clear water；
S8, after 1 minute, be implanted sequentially 26m3Klorvess Liquid replace mud, described Klorvess Liquid concentration is
4%；Injection 2m3Sodium carboxymethyl cellulose insulating liquid, after 1 minute elapsed time, throw a diameter of 41.3mm one, setting ball；
S9, continuation injection 60m3Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place,
Now cement mortar bottom has reached more than the initiating terminal of horizontal segment；Continue injection Klorvess Liquid, all open hole packers 8 are whole
One-shot, realizes sealing；
Solidifying 48 hours of s10, time, open pressure reduction sliding sleeve 7, electrical measurement cementing quality.
Described two boiled water horizontal wells completion integral tubular column unit admittedly, the tubing string 2 including sleeve pipe 1, being located in sleeve pipe 1, tubing string 2
The pitching sliding sleeve 6 that be made up of vertical section 3, tilting section 4 and horizontal segment 5 from top to bottom, is arranged on horizontal segment 5, pressure reduction sliding sleeve 7,
Open hole packer 8 and float shoe 9, also include float collar 10 and self-styled ball seat 11, described open hole packer 8 at least three, and any two
It is provided with a pitching sliding sleeve 6, described tubing string 2 passes sequentially through screwed connection institute from top to bottom between individual adjacent open hole packer 8
State float shoe 9, float collar 10, self-styled ball seat 11, pressure reduction sliding sleeve 7, open hole packer 8 and pitching sliding sleeve 6.
The operation principle of the self-styled ball seat of the present invention is: the internal diameter of seat of receiving is less than the external diameter of setting ball, when setting ball is from well
Mouth input whereabouts arrival is received after seat, realizes sealing in pipe.Injection liquid in pipe, overpressure rising, when being increased to bore hole
During packer unpacking pressure, open hole packer starts sealing, continues injection liquid, and pressure also continues to raise, and slides when reaching pressure reduction
During set Opening pressure, pressure reduction sliding sleeve is opened.
The operation principle of pressure reduction sliding sleeve of the present invention is: after putting into setting ball, setting ball reaches seat of receiving, and injects in pipe
Liquid, pressure rise, when reaching certain pressure value, shear pin is cut off, and pressure reduction sliding sleeve is opened, with pressure reduction sliding sleeve in tubing string pipe
Pipe outer toric space connection, is connected with one section of reservoir of shaft bottom foot.
The operation principle of pitching sliding sleeve of the present invention is: when setting ball puts in tubing string from well head, drops to when receiving, because
The external diameter of setting ball is more than an internal diameter of receiving, and realizes sealing, when pressure is raised to certain value, that is, pipe external and internal pressure difference reaches
During design load, shear pin is cut off, setting ball and receive that seat is descending, and window is opened, and realizes the inside and outside connection of pipe.
The operation principle of open hole packer of the present invention is: when inside and outside differential pressure reaches design load, shear pin is cut off, fluid cylinder
Promotion promotes packing element to be subject to longitudinal extruding, and external diameter increases 10%-30%, realizes sealing；All open hole packer size uniformity samples, work
When pressure reaches unpacking pressure when making, all open hole packers that a bite down-hole enters all are broken seal simultaneously.
Using the solid completion integral tubular column unit of two boiled water horizontal wells, including float collar and self-styled ball seat, open hole packer is at least
For three, between the adjacent open hole packer of any two, it is provided with a pitching sliding sleeve, tubing string passes sequentially through screw thread from top to bottom
Connect described float shoe, float collar, self-styled ball seat, pressure reduction sliding sleeve, open hole packer and pitching sliding sleeve, wherein, float shoe plays guiding function；
During lower tubular column, the drilling fluid outside pipe is unable in sleeve pipe float collar, is in normal sealing state, but the drilling well irrigating in pipe
When liquid head of liquid is higher than toric space head of liquid, in pipe, drilling fluid then can enter toric space by float collar；Self-styled ball seat,
Both there is single current valve action, simultaneously stacker blocking, and assisted to realize open hole packer sealing and assistance is realized pressure reduction sliding sleeve and opened；
Pressure reduction sliding sleeve, when in tubing string, pressure is higher than pipe external pressure setting value, pressure reduction sliding sleeve is opened, and during reservoir reconstruction, fracturing fluid is with regard to energy
Enough stratum is entered by this passage；Pitching sliding sleeve, forms window, during reservoir reconstruction, pressure break for reservoir segmentation is opened with tubing string
Liquid enters stratum by this window；Open hole packer, for insulating the upper and lower toric space of jacket exterior, horizontal fragmentation is separated,
When realizing this section of reservoir fracturing improvement, pressure can not be delivered in other sections, and other horizontal segments are unaffected up and down；Sleeve pipe, uses
In insulating the open hole bore getting out, form oil gas flow channel；Direct cementing well after tubing string is lowered into predetermined well depth,
After cement slurry sets, directly carry out reservoir reconstruction, greatly improve safety；Tubular column unit total cost have dropped 40%,
Pressing crack construction discharge capacity up to 10 cubic meters per minute it is achieved that to the transformation of the depth of reservoir, when reservoir reconstruction construction is greatly shortened
Between；Correctional effect lifting more than 20%；Transformation reservoir construction pressure break liquid measure is greatly reduced, saves reservoir reconstruction operating expenses
More than 10%；Effectively raise bit speed, shorten brill completion period, reduce development cost, improve recovery ratio.
Embodiment 3
A kind of two boiled water horizontal wells completion construction method admittedly, comprises the following steps:
S1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, and then entering down external diameter is the oval of 273mm
Button casing cementing；
S2, two open straight well section adopt external diameter be 222mm drill bit, be drilled into 2850 meters of well depth, two open lower curved section and horizontal segment
Full well finishing drilling is got to using the drill bit for 215.9mm for the external diameter；
S3, on drilling tool, order milling post and the solid completion integral tubular column unit of double milling post simulation two boiled water horizontal wells are led to
Well, the well the getting out borehole wall is repaired smooth, by place expansion little for borehole diameter；
After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；
S5, flushing ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3
Cement mortar neck slurry；
S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.92kg/m3；
S7, after 1 minute, be implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject
3m3Clear water；
S8, after 1 minute, be implanted sequentially 30m3Klorvess Liquid replace mud, described Klorvess Liquid concentration is
4%；Injection 2m3Sodium carboxymethyl cellulose insulating liquid, after 1 minute elapsed time, throw a diameter of 41.3mm one, setting ball；
S9, continuation injection 60m3Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place,
Now cement mortar bottom has reached more than the initiating terminal of horizontal segment；Continue injection Klorvess Liquid, all open hole packers 8 are whole
One-shot, realizes sealing；
Solidifying 48 hours of s10, time, open pressure reduction sliding sleeve 7, electrical measurement cementing quality.
Described two boiled water horizontal wells completion integral tubular column unit admittedly, the tubing string 2 including sleeve pipe 1, being located in sleeve pipe 1, tubing string 2
The pitching sliding sleeve 6 that be made up of vertical section 3, tilting section 4 and horizontal segment 5 from top to bottom, is arranged on horizontal segment 5, pressure reduction sliding sleeve 7,
Open hole packer 8 and float shoe 9, also include float collar 10 and self-styled ball seat 11, described open hole packer 8 at least three, and any two
It is provided with a pitching sliding sleeve 6, described tubing string 2 passes sequentially through screwed connection institute from top to bottom between individual adjacent open hole packer 8
State float shoe 9, float collar 10, self-styled ball seat 11, pressure reduction sliding sleeve 7, open hole packer 8 and pitching sliding sleeve 6.
The external diameter of the pitching sliding sleeve 6 setting gradually from top to bottom along tubing string 2 is identical, and internal diameter is gradually increased.
Described self-styled ball seat 11 includes the ball-and-seat 12 linking together and seat 13 of receiving, and seat 13 of receiving is located at ball-and-seat 12
Top.
The size of described pressure reduction sliding sleeve 7 be 8.5 inches, length be 0.94 meter, external diameter be 177.8 millimeters, Opening pressure and
Setting pressure is 38mpa, 149 DEG C of heatproof, and bearing pressure reduction is 70mpa.
In described step s4, drifting is just referring to drilling tool and is above carrying do not block, and transfers non-resistance.
In described step s9, injection pressure is 40mpa.
The external diameter of the pitching sliding sleeve setting gradually from top to bottom along tubing string is identical, and internal diameter is gradually increased, when setting ball is from well
Mouthful put in tubing string, drop to when receiving, the external diameter because of setting ball is more than an internal diameter of receiving, and realizes sealing, when pressure is raised to
During certain value, that is, when pipe external and internal pressure difference reaches design load, shear pin is cut off, and setting ball and seat of receiving are descending, window
Open, realize the inside and outside connection of pipe；By increasing the internal diameter of pitching sliding sleeve from top to bottom successively along tubing string, can either realize good
Sealing is it is also possible to ensure pipe inside and outside connection smoothness.
Self-styled ball seat includes the ball-and-seat linking together and seat of receiving, and seat of receiving is located at the top of ball-and-seat, when setting
Ball is received from well head input whereabouts arrival after seat, is capable of good sealing in pipe；Liquid, overpressure liter is injected in pipe
Height, when being increased to open hole packer unpacking pressure, open hole packer starts sealing, continues injection liquid, and pressure also continues to rise
Height, when reaching pressure reduction sliding sleeve Opening pressure, pressure reduction sliding sleeve is opened, and using the self-styled ball seat of this ad hoc structure, has both had list
Stream valve action, simultaneously can stacker blocking, can effectively assist to realize open hole packer sealing and pressure reduction sliding sleeve is realized in assistance
Open.
The size of pressure reduction sliding sleeve is 8.5 inches, and length is 0.94 meter, and external diameter is 177.8 millimeters, Opening pressure and setting pressure
Power is 38mpa, 149 DEG C of heatproof, and bearing pressure reduction is 70mpa, and after putting into setting ball, setting ball reaches seat of receiving, and notes in pipe
Enter liquid, pressure rise, when reaching certain pressure value, shear pin is cut off, pressure reduction sliding sleeve is opened, slide with pressure reduction in tubing string pipe
Sleeve pipe outer toric space connection, is connected with one section of reservoir of shaft bottom foot, pressure reduction sliding sleeve stability in use is strong.
Complete 9.15 ms/h of well average rate of penetration, 7.9 ms/h of prior art of ratio, improve 15.8%；With two
Compare by the way of coiled tubing carries underseal instrument pressure break after opening well cementation, individual well saves 8.5 days gas testing cycles, individual well saving tries
More than 100,000 yuan of gas cost.
Greatly improve reservoir reconstruction effect, pressing crack construction discharge capacity, up to 10 cubic meters per minute, is stood compared with prior art 4.8
It is achieved that transforming to the depth of reservoir for square m/min, correctional effect lifting more than 20%.
Contrast coiled tubing band underseal instrument pressure break, in the case of sand feeding amount is consistent, average individual well can reduce fracturing fluid and use
Amount 340m3, save 170,000 yuan of fracturing fluid expense；Contrast coiled tubing band underseal instrument pressure break mode, in segments the same terms
Under, average individual well can save instrument, acid solution, more than 1,000,000 yuan of crane cost.
This method is applied to the domestic Soviet Union's Sulige gas field in Ordos of Inner Mongolia, referring to table 1.
Table 1 is: using two boiled water horizontal well boring methods, Soviet Union's Sulige gas field is constructed；
Table 1
As can be seen from Table 1: complete within 2013 3 mouthfuls of wells, complete within 2014 5 mouthfuls of wells, horizontal section length all more than 600 meters,
For up to 1400 meters.
Su Lige bis- opened horizontal well drilling completion cycle time within 39 days, and full well rate of penetration improves more than 5%；2014
Years two open the horizontal well drilling completion cycle 37.6 days, 9.15 ms/h of full well average rate of penetration, 7.9 ms/h of 2013 of ratio
Improve 15.8%, two boiled water horizontal well individual well costs decline more than 15%；If two boiled water horizontal well horizontal segments press 600 meters of calculating, individual well
Development cost declines 25%.
Open horizontal drilling using two, compared with for three spudding wells, after completion, horizontal segment is bore hole, and before fracturing reform, reservoir is not subject to
Cement mortar pollutes；More than horizontal segment cement the well reliable；Completion tubular column internal diameter is big, can really realize extensive volume fracturing transformation；Water
After flat section is engineered, reservoir all can effectively be employed；Sand blast sliding sleeve is easy brill sliding sleeve, and boring after opening is sleeve pipe full-bore, after being
The reentry construction technology such as continuous well workover, water blockoff creates good condition；Drilling well, well cementation, completion, gas testing, the linking of operation overall process are tight
Close, construction period significantly shortens, and substantially, reservoir reconstruction effect is significant is lifted the development cost range of decrease.
The direct economic benefit obtaining:
1st, drilling period significantly shortens, 5-14-26h well drilling period of reviving: 26.92 days, creates Soviet Union's Sulige gas field two and opens
Horizontal well records the soonest.Open within 2014 two Predicting of Drilling Time In Horizontal Wells average 37.625 days, average than three boiled water horizontal wells 53 days reduce
15 days, wellbore construction expense reduced more than 1,000,000 yuan.
2 and two open and adopt coiled tubing band underseal instrument pressure break after well cementation, and individual well saves 8.5 days gas testing cycles, gas testing list
Cost-effective more than 100,000 yuan of the individual well in position.
3rd, contrast coiled tubing band underseal instrument pressure break, in the case of sand feeding amount is consistent, average individual well can reduce fracturing fluid
Consumption 340 side, saves 170,000 yuan of fracturing fluid expense.
4th, contrast coiled tubing band underseal instrument pressure break, under segments the same terms, average individual well can save instrument, acid
More than 1,000,000 yuan of liquid, crane cost.
5th, three opening structures are contrasted, individual well can save 30 tons of sleeve pipe, more than 200,000 yuan of saving sleeve pipe expense.
The indirect economic effect obtaining:
1st, reservoir reconstruction effect is significantly lifted, and well yield, quantum of output are improved；
2nd, secondary reentry well workover, water blockoff work can be carried out.
Claims (7)
1. a kind of two boiled water horizontal wells consolidate completion construction method it is characterised in that comprising the following steps:
S1, an exploitation external diameter are the drill bit of 346mm, are drilled into 750 meters of well depth, then enter down the oval retaining ring that external diameter is 273mm
Pipe is cemented the well；
S2, two open the drill bit that straight well section adopts external diameter to be 222mm, be drilled into 2850 meters of well depth, two open lower curved section and horizontal segment adopts
External diameter is that the drill bit of 215.9mm gets to full well finishing drilling；
S3, on drilling tool, order milling post and the solid completion integral tubular column unit of double milling post simulation two boiled water horizontal wells carry out drifting, will
The well borehole wall finishing getting out is smooth, by place expansion little for borehole diameter；
After s4, drifting are normal, act drilling tool, under enter the solid completion integral tubular column unit of two boiled water horizontal wells；
S5, flushing ground well cementation pipeline, pressure testing 45mpa is qualified；It is implanted sequentially 4m3Clear water, injection density be 1.5kg/m3Water
Mud neck slurry；
S6, after 1 minute, inject 25m3Cement mortar, the density of described cement mortar is 1.85-1.92kg/m3；
S7, after 1 minute, be implanted sequentially 5m3Clear water, inject 2m3Sodium carboxymethyl cellulose insulating liquid, reinject 3m3's
Clear water；
S8, after 1 minute, be implanted sequentially 25-30m3Klorvess Liquid replace mud, described Klorvess Liquid concentration is
4%；Injection 2m3Sodium carboxymethyl cellulose insulating liquid, after 1 minute elapsed time, throw a diameter of 41.3mm one, setting ball；
S9, continuation injection 60m3Klorvess Liquid, observe pump pressure change, pump pressure raises suddenly, judges that setting ball puts in place, now
Cement mortar bottom has reached more than the initiating terminal of horizontal segment；Continue injection Klorvess Liquid, all open hole packers (8) whole
Secondary startup, realizes sealing；
Solidifying 48 hours of s10, time, open pressure reduction sliding sleeve (7), electrical measurement cementing quality.
2. a kind of solid completion construction method of two boiled water horizontal wells according to claim 1 it is characterised in that: described two boiled water are put down
The solid completion integral tubular column unit of well, includes sleeve pipe (1), the tubing string (2) in sleeve pipe (1), tubing string (2) from top to bottom by erecting
Straight section (3), tilting section (4) and horizontal segment (5) constitute, is arranged on horizontal segment (5) pitching sliding sleeve (6), pressure reduction sliding sleeve (7),
Open hole packer (8) and float shoe (9), also include float collar (10) and self-styled ball seat (11), described open hole packer (8) at least three
Individual, it is provided with a pitching sliding sleeve (6) between the adjacent open hole packer of any two (8), described tubing string (2) is from top to bottom successively
By float shoe described in screwed connection (9), float collar (10), self-styled ball seat (11), pressure reduction sliding sleeve (7), open hole packer (8) and pitching
Sliding sleeve (6).
3. a kind of solid completion construction method of two boiled water horizontal wells according to claim 2 it is characterised in that: along tubing string (2) from
Under identical to the external diameter of the pitching sliding sleeve (6) above setting gradually, internal diameter is gradually increased.
4. a kind of solid completion construction method of two boiled water horizontal wells according to claim 2 it is characterised in that: described self-styled ball seat
(11) include ball-and-seat (12) and the seat of receiving (13) linking together, seat of receiving (13) is located at the top of ball-and-seat (12).
5. a kind of solid completion construction method of two boiled water horizontal wells according to claim 2 it is characterised in that: described pressure reduction sliding sleeve
(7) size is 8.5 inches, and length is 0.94 meter, and external diameter is 177.8 millimeters, and Opening pressure and setting pressure are 38mpa, resistance to
149 DEG C of temperature, bearing pressure reduction is 70mpa.
6. a kind of solid completion construction method of two boiled water horizontal wells according to claim 1 it is characterised in that: described step s4
In, drifting is just referring to drilling tool and is above carrying do not block, and transfers non-resistance.
7. a kind of solid completion construction method of two boiled water horizontal wells according to claim 1 it is characterised in that: described step s9
In, injection pressure is 40mpa.
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| CN109162643A (en) * | 2018-10-19 | 2019-01-08 | 成都科盛石油科技有限公司 | Finishing drilling method for continuous type shale reservoir |
| CN109322618A (en) * | 2018-10-19 | 2019-02-12 | 成都科盛石油科技有限公司 | Heterogeneous shale gas well Reservoir Section finishing drilling method |
| CN115324544A (en) * | 2021-05-10 | 2022-11-11 | 中国石油天然气股份有限公司 | Well completion method for four-well-body structure of super heavy oil reservoir SAGD horizontal production well |
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| CN115324544B (en) * | 2021-05-10 | 2024-05-28 | 中国石油天然气股份有限公司 | Completion method of four-well structure of SAGD horizontal production well of super heavy oil reservoir |
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Application publication date: 20170118 |