CN109322618A - Heterogeneous shale gas well Reservoir Section finishing drilling method - Google Patents
Heterogeneous shale gas well Reservoir Section finishing drilling method Download PDFInfo
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- CN109322618A CN109322618A CN201811221405.2A CN201811221405A CN109322618A CN 109322618 A CN109322618 A CN 109322618A CN 201811221405 A CN201811221405 A CN 201811221405A CN 109322618 A CN109322618 A CN 109322618A
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- 238000005553 drilling Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005086 pumping Methods 0.000 claims description 23
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- 239000004576 sand Substances 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 46
- 239000010410 layer Substances 0.000 description 23
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- 230000015572 biosynthetic process Effects 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 8
- 239000011435 rock Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
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- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 241000707825 Argyrosomus regius Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
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- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 239000004058 oil shale Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Classifications
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- 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
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Abstract
The invention discloses heterogeneous shale gas well Reservoir Section finishing drilling methods, it is protected for the drilling technology of shale gas Reservoir Section finishing drilling, it is serious especially suitable for heterogeneity, from macroscopically seeing the longer casing programme of shale reservoir section, it is high to provide a set of feasibility, effective engineering construction method, and without expensive drilling fluid system, only start with from engineering viewpoint, sufficient finishing and specification have been carried out to the barefoot interval of shale interval, it solves the deeper shale gas well finishing drilling of buried depth in the prior art to make a trip difficulty, the big problem of setting of casing risk, realize reduces operating risk from construction technology, improve the purpose of setting of casing safety coefficient.
Description
Technical field
The present invention relates to shale gas well drilling engineering fields, and in particular to heterogeneous shale gas well Reservoir Section finishing drilling method.
Background technique
Shale gas refers to that preservation is continuous life in the Unconventional gas preserved in series of rocks based on rich organic shale
At biochemical genesis air and heat origin cause of formation gas or both mixing, can be present in intrinsic fracture and hole with free state, to inhale
Attached state is present in kerogen, clay particle surface, and there are also minute quantities to be stored in kerogen and asphalitine with dissolved state, dissociates
Gas ratio is generally 20%~85%.Shale gas is mined natural gas from rammell, and main body is located at dark-coloured mud shale
Or in high-carbon mud shale, shale gas is to be present in mud stone, high-carbon mud stone, shale and aleuritic texture in main body with absorption or free state
Natural gas in rock class interlayer, it can be generated in the various stage natural gas main bodys of organic origin with free phase (about
50%) it is present in crack, hole and other reservoir spaces, kerogen, clay particle is present in adsorbed state (about 50%)
And pore surface, minute quantity are stored in kerogen, asphalitine and petroleum with dissolved state.Natural gas exists in sandwich-like
Siltstone, silty, argillaceous siltstoue, even in sandstone formation.It is nearest poly- in source bed after natural gas generates
Collection, shows as typical original place Reservoir model, larger with the difference such as oil shale, oil-sand, asphalt.Not with conventional reservoir gas reservoir
Together, shale is both the source rock that natural gas generates, and aggregation and the reservoir and cap rock that save natural gas.Therefore, the content of organic matter
High black shale, high-carbon mud stone etc. are often best shale gas developmental conditions.
In recent years, it is influenced by the U.S., Canadian shale gas Successful commercial exploitation, global shale gas exploration and development is in quick
Developing state.However, storage medium is shale formation since shale gas original place is at the trap pattern of hiding.For conventional gas and oil
For field, shale formation is all the geologic structure as source bed or cap rock, therefore as one can imagine the reservoir of shale gas is permeated
Rate is extremely low, and it is difficult to exploit.
Firstly, the reservoir of shale gas reservoir is generally in low hole, the physical property characteristic of low-permeability, the resistance ratios of air-flow are routinely natural
Gas is big, and all wells require implementation reservoir fracturing improvement could be mined.Secondly, shale gas recovery ratio compares conventional gas
Low, conventional gas recovery ratio is 60% or more, and shale gas is only 5%~60%.Low yield, which affects people, is keen to it,
The U.S. has had some advanced technologies that shale gas well yield can be improved.The reservoir of Chinese shale gas reservoir compared with the U.S.
Difference, the shale gas-bearing formation buried depth such as the Sichuan Basin is bigger than the U.S., the shale gas-bearing formation depth in the U.S. at 800~2600 meters, and
The shale gas-bearing formation buried depth in the Sichuan Basin is at 2000~3500 meters.The increase of shale gas-bearing formation depth is undoubtedly in our jejune skills of sheet
Development difficulty is added in art again.Specific on drilling engineering, due to the extremely low rock permeability of shale interval, lead to drilling well
In journey in shale gas Reservoir Section, drilling fluid can not be dehydrated to form complete mud cake in the borehole wall, and the shortcoming of mud cake leads to drilling tool and well
Lack lubrication and buffering between wall, causes frictional resistance very big, make a trip difficulty, and subsequent casings are even resulted in when serious can not be successfully down
Enter, causes wellbore to scrap or be merely able to carry out sidetracking, cause serious engineering accident.It is all in the prior art in drilling fluid to this
Performance, studied on formula, such as attempted using oil base drilling fluid, it is intended to ensure that casing is smooth by OPTIMIZATION OF DRILLING FLUID
In the shaft bottom Reservoir Section of shale gas well, however this mode is ineffective, especially for China Sichuan Basin buried depth phase
For deeper shale gas reservoir, also results in drilling fluid cost and sharply rise, cause business exploitation profit meagre or even profit
It is negative, this is tantamount to make the matter worse for the shale gas for being originally difficult to commercialize.
Summary of the invention
The purpose of the present invention is to provide heterogeneous shale gas well Reservoir Section finishing drilling methods, to solve buried depth in the prior art
Deeper shale gas well finishing drilling makes a trip problem difficult, that setting of casing risk is big, realize reduced from construction technology operating risk,
Improve the purpose of setting of casing safety coefficient.
The present invention is achieved through the following technical solutions:
Heterogeneous shale gas well Reservoir Section finishing drilling method, comprising the following steps:
(a) drilling to design well depth, shaft bottom has stayed well head bag, is recycled to shaft bottom landwaste with discharge capacity A and returns out to well head, completes
The sieve residue log of full well section；Remember that bottom depth is Y, the depth of upper layer casing shoe is M, takes X=(Y-M)/2+M；
(b) back reaming pulls out of hole to upper layer casing shoe, recycles one week in the casing shoe of upper layer, is drilled into shaft bottom under termination of pumping stalling,
Prospect pit bottom sand setting height；Shaft bottom sand setting is destroyed, again drilling to design well depth, with discharge capacity A circulation one week；
(c) termination of pumping, which has stalled, is drilled into well depth X: if entering step (e) in trip-out process without the resistance hanging point within 10t；If
There is resistance hanging point in trip-out process, and be hampered more than 10t, then enters step (d)；
(d) it is risen with discharge capacity A/2 back reaming and is drilled into 10m above resistance hanging point, then to be drilled under reaming under discharge capacity A/4 under resistance hanging point
Square 10m, the stalling of termination of pumping later pull out of hole again: if resistance is hung less than 10t in trip-out process, having continued to be drilled into well depth X, enter step
(e)；If being hampered still above 10t, this step is repeated, until resistance when termination of pumping stalling pulls out of hole hangs and is less than 10t, is further continued for pulling out of hole
To well depth X, enter step (e)；
(e) at well depth X, with discharge capacity A circulation one week, it is drilled into Y under termination of pumping stalling, and rise be drilled at well depth X again；If
(Y-M) > 50m then enables Y=X, takes X '=(Y-M)/2+M；
(f) X is replaced with X ', repeats step (c)~(e), until (Y-M)≤50m；
(g) it pulls out of hole to the casing shoe of upper layer, with discharge capacity A/4 circulation one week in the casing shoe of upper layer, rises and be drilled into well head, trap
Pipe.
It makes a trip problem difficult, that setting of casing risk is big for the deeper shale gas well finishing drilling of buried depth in the prior art, this
Invention proposes that heterogeneous shale gas well Reservoir Section finishing drilling method, this method pass through drilling engineering technology controlling and process completely, it is ensured that shale
The shaft bottom Reservoir Section wellbore of gas well is unobstructed, improves the big problem of setting of casing risk as caused by the shortcoming of wall cake.We
Method is crept into first to design well depth, and well head bag has been stayed in shaft bottom, and complete well head bag can provide droping space for sand setting, also complete for the later period
Well tool provides enough pocket depths.Shaft bottom landwaste is recycled to discharge capacity A later to return out to well head, completes the landwaste of full well section
Well logging to ensure the complete of sieve residue log work, while enabling the landwaste just drilled out in well to return and draining into well head and set through solid controlling
It is standby to be handled, avoid the accumulation of new landwaste in well.Note bottom depth is Y at this time, the depth of upper layer casing shoe is M, takes X=
(Y-M)/2+M, depth X at this time are the well depth midpoint between the casing shoe of shaft bottom to upper layer.The is carried out to barefoot interval later
Single treatment.Back reaming, lower reaming belong to the professional term in drilling engineering, and those skilled in the art are appreciated that.By falling
Reaming pulls out of hole to the casing shoe of upper layer, so that first time processing is carried out to barefoot interval, using in bottom drilling assembly (BHA)
Large-sized position such as centralizer, bit gauge protection, modifying to the borehole wall from bottom to top, eliminates and bores when opening new stratum in the borehole wall
The irregular special-shaped corner angle formed, so that entire wellbore tends to be smooth continuous.Also, inevitable turn on pump during back reaming, because
This gradually can be driven upwards the special-shaped corner angle landwaste scraped from the borehole wall using drilling fluid, up to back reaming to upper layer casing shoe
Interior, drilling tool has been in home at this time, is sufficiently recycled, it is ensured that and circulation time at least one week, so that the institute on drill bit
There is the drilling fluid in casing that can be recycled, so that can be adequately discharged by the landwaste that back reaming is driven upwards
It is handled to well head.Circulation one week, that is, refer to that drilling fluid is pumped into drilling rod from slush pump, until being returned out from annular space to well head institute
The time needed.By casing inner diameter it is known that drilling rod internal-and external diameter is it is known that the discharge capacity of slush pump is taken it is known that therefore recycling one week
Between can directly calculate.After the time requirement that circulation meets one week, shaft bottom, prospect pit bottom sand setting are drilled under termination of pumping stalling
Height simultaneously records sand setting height, provides for later period setting of casing, lower completion tubular column with long foundation.It visits to after the sand setting of shaft bottom, turn on pump, weight
New drilling is to design well depth, so that shaft bottom sand setting is destroyed, convenient for being recycled in shaft bottom.At this time with discharge capacity A circulation one week, again
Landwaste in well is cleared up, is also drawn off the chip off-falling collided in going down process in well.(c) is entered step later, termination of pumping stalling pulls out of hole
To well depth X: if without the resistance hanging point within 10t in trip-out process, in the distance for indicating bottom depth Y to well depth X, wellbore is by upper
State processing it is more unobstructed, the resistance hanging point within 10t will not cause too big harm, casing to casing job in engineering
Can be by the resistance hanging point within 10t using inertia in decentralization process of pouring water, therefore it is directly entered step (e)；If rising drill-through
Cheng Zhongyou hinders hanging point, and is hampered more than 10t, then enters step (d).The step (d) are as follows: risen and be drilled into discharge capacity A/2 back reaming
10m above hanging point is hindered, then to be drilled into 10m below resistance hanging point under reaming under discharge capacity A/4, the stalling of termination of pumping later pulls out of hole again: if rising
Resistance, which is hung, during boring is less than 10t, then has continued to be drilled into well depth X, enter step (e)；If being hampered still above 10t, this is repeated
Step has been further continued for being drilled into well depth X, enter step (e) until resistance when termination of pumping stalling pulls out of hole hangs and is less than 10t.Wherein, pass through
The back reaming operation of resistance hanging point takes the discharge capacity of A/2, is to reduce discharge capacity herein to the half of normal circulation discharge capacity, wellbore is avoided to exist
Build the pressure suddenly when hindering hanging point by blocking serious, in the excessive well of discharge capacity, cause bottom drill tool simultaneously by the blocking of upper sheet resistance hanging point,
The lifting of lower section drilling liquid pressure forms and blocks on bottom drill tool in such cases to the complex situations of centre force simultaneously up and down
Under suppress, easily cause drilling tool stuck, form serious engineering accident.Therefore control back reaming operation discharge capacity is normal in the present invention
The half for recycling discharge capacity, even if there is the situation that builds the pressure, pressure rises also can be significant slack-off, and it is stuck to be unlikely to moment.It is opened in pressure
When beginning to rise, provides the enough reaction time quickly to transfer drilling tool for driller, so that drilling tool is quickly left danger zone, greatly
Overcome shale gas well in the prior art be easy to build the pressure stuck drilling tool the case where.And the lower reaming operation by hindering hanging point takes A/4
Discharge capacity, be herein reduce discharge capacity to normal circulation discharge capacity a quarter.Take the discharge capacity of A/4 has the technical effect that head
It first still prevents from building the pressure in unexpected well, reserves more operation times for driller, prominent build the pressure is avoided to be lifted drilling tool and lead
The drilling rod for causing top more weak bears the impact of moment；Secondly, in existing bottom drilling assembly, when be often used screw motor
The characteristics of drilling tool, such drilling tool, is that exporting revolving speed and displacement size is positively correlated, herein under the premise of, during lower reaming, drop
Low discharge capacity can effectively make the output revolving speed of screw motor be decreased obviously compared to the revolving speed in drilling process to A/4, and lower stroke
Drill bit can not quickly break originally more hard shale formation during eye, can effectively advance along old wellbore, avoid boring
New wellbore or the situation for drilling out larger step, hole etc. out, the significant safety improved during lower reaming and wellbore are steady
It is qualitative.The stalling of termination of pumping later pulls out of hole again, and trip-out at this time is that examination pulls out of hole, it is therefore intended that examine the back reaming carried out just now, under
Reaming effect, if the borehole wall is modified into rule.If the borehole wall is adequately corrected, pulling out of hole at this time should be more smooth,
It shows it is then resistance hanging point within no 10t on engineering parameter, can then continue to be drilled into well depth X at this time.If the borehole wall passes through primary
The finishing of back reaming, lower reaming is still difficult to pass through, and shows on engineering parameter to be exactly to be hampered still above 10t, then repeats this
Step is that repetition " is risen with discharge capacity A/2 back reaming and is drilled into 10m above resistance hanging point, then hung with being drilled into resistance under reaming under discharge capacity A/4
Point lower section 10m, the stalling of termination of pumping later pull out of hole again ", until resistance when termination of pumping stalling pulls out of hole hangs and is less than 10t, it has been further continued for being drilled into
Well depth X in trip-out process, encounters any point being hampered more than 10t, is carried out this step, to guarantee the chance to full well section all
Resistance point is all modified.It enters step (e) later: at well depth X, with discharge capacity A circulation one week, being modified to during turn on pump reaming
On the landwaste that rushes in the casing of upper layer recycled, be allowed to be discharged in well.It is drilled into Y under the stalling of termination of pumping later, and rises be drilled into again
At well depth X；If (Y-M) > 50m, enables Y=X, X '=(Y-M)/2+M is taken；X is replaced with X ', repeats step (c)~(e), until
(Y-M)≤50m.Step (e) to (f) is then double of the finishing carried out to the barefoot interval of shale reservoir gradually, is modified every time
Separation takes the midpoint of top barefoot interval, until (Y-M)≤50m, that is, the separation that last time is modified is apart from upper layer
The distance of casing shoe is less than or equal to 50m, at this point, full well section is all sufficiently modified, all resistance hanging points being hampered more than 10t
It is all sufficiently modified, the borehole wall of entire barefoot interval obtains sufficient specification, and the irregular corner angle of the borehole wall, are fallen from power at keyway
The position that rank etc. can all influence to make a trip can access stable finishing, ensure that the reliability of casing job.?
(Y-M)≤50m when, directly pull out of hole in the casing shoe of upper layer, with discharge capacity A/4 circulation one week in the casing shoe of upper layer, following at this time
Ring discharge capacity is only discharge capacity A/4, is to carry secretly because being in more clean state in mineshaft annulus at this time without using discharge capacity
It is returned on landwaste, circulation is intended merely to provide necessary process for the new slurry needed for before replacement setting of casing in engineering for one week.Because trapping
Improve the overall performance of drilling fluid in well before Guan, optimal mode is exactly that direct replace newly is starched, and new slurry is not due to by landwaste
Pollution, properties splendid to the suspending power of landwaste can be effectively prevent miscellaneous in the drilling fluid of top all in optimum state
Object sinks down into shaft bottom.It is recycled with the small displacement of A/4, can be effectively reduced bottom drill tool and the extension of upper layer casing is cut, reduced to upper
The injury of layer internal surface of sleeve pipe.Circulation after a week, can be completed new slurry and replace, directly rise be drilled into well head later, carry out setting of casing work
Industry.The present invention is protected for the drilling technology of shale gas Reservoir Section finishing drilling, serious especially suitable for heterogeneity, from macro
The longer casing programme of shale reservoir section is seen in sight, provides a set of feasibility height, effective engineering construction method, and nothing
Expensive drilling fluid system need to be used, only starts with from engineering viewpoint, the barefoot interval of shale interval has been carried out sufficiently
Finishing and specification, it is big to solve make a trip difficult, setting of casing risk of the deeper shale gas well finishing drilling of buried depth in the prior art
Problem realizes the purpose for reducing operating risk from construction technology, improving setting of casing safety coefficient.
The annular space that discharge capacity A meets shaft bottom to upper layer casing shoe returns speed not less than 0.8m/s.It is different for drilling engineering
The wellbore of size, various sizes of drilling rod and different slush pump performances are all the factors of specific discharge capacity that influences, therefore difficult
Specifically to be limited discharge capacity.And the end reaction of discharge capacity is exactly that annular space returns speed, therefore limits annular space in this programme and return speed not
Lower than 0.8m/s, discharge capacity A only needs to meet the condition, and quantitative restriction can be carried out to the discharge capacity A in different wells.
Preferably, the complete well head bag reserves 5~10m.
Preferably, the revolving speed of the back reaming is 40~50rpm, and the revolving speed of the lower reaming is 20~30rpm.Back reaming
In the process, using 40~50rpm, sufficiently the borehole wall can be modified by the gauge teeth of drill bit.And during lower reaming, turn
Speed is only 20~30rpm, can further avoid the situation for drilling out new wellbore or drilling out larger step, hole etc., further
Safety and hole stability under improving during reaming.
It preferably, further include that logging operation is carried out before setting of casing.This operation rise get into well head after carry out, refer to
It is traditional wireline logging operation.For the wellbore construction for using more advanced well logging LWD technology to carry out, then without
Need to carry out this step.
Compared with prior art, the present invention having the following advantages and benefits:
1, the heterogeneous shale gas well Reservoir Section finishing drilling method of the present invention carries out pair gradually to the barefoot interval of shale reservoir
Half modifies, and the separation modified every time takes the midpoint of top barefoot interval, until (Y-M)≤50m, that is, last time are modified
Distance of the separation apart from upper layer casing shoe be less than or equal to 50m, at this point, full well section is all sufficiently modified, Suo Youyu
Resistance is more than that the resistance hanging point of 10t is all sufficiently modified, and the borehole wall of entire barefoot interval obtains sufficient specification, and the borehole wall is not advised
The position that then corner angle, keyway, rank of falling from power etc. can all influence to make a trip can access stable finishing, ensure that setting of casing
The reliability of operation.
2, the heterogeneous shale gas well Reservoir Section finishing drilling method of the present invention, for shale gas Reservoir Section finishing drilling drilling technology into
Go protection, it is serious especially suitable for heterogeneity, from the longer casing programme of shale reservoir section is macroscopically seen, provide a set of
Feasibility height, effective engineering construction method, and without expensive drilling fluid system, only from engineering viewpoint
Start with, sufficient finishing and specification have been carried out to the barefoot interval of shale interval, solved the deeper page of buried depth in the prior art
Rock gas well finishing drilling makes a trip problem difficult, that setting of casing risk is big, and realizing reduces under operating risk, raising from construction technology
The purpose of casing safety coefficient.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the logical schematic of the specific embodiment of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment 1:
Heterogeneous shale gas well Reservoir Section finishing drilling method as shown in Figure 1, comprising the following steps:
(a) drilling to design well depth, shaft bottom has stayed well head bag, is recycled to shaft bottom landwaste with discharge capacity A and returns out to well head, completes
The sieve residue log of full well section；Remember that bottom depth is Y, the depth of upper layer casing shoe is M, takes X=(Y-M)/2+M；
(b) back reaming pulls out of hole to upper layer casing shoe, recycles one week in the casing shoe of upper layer, is drilled into shaft bottom under termination of pumping stalling,
Prospect pit bottom sand setting height；Shaft bottom sand setting is destroyed, again drilling to design well depth, with discharge capacity A circulation one week；
(c) termination of pumping, which has stalled, is drilled into well depth X: if entering step (e) in trip-out process without the resistance hanging point within 10t；If
There is resistance hanging point in trip-out process, and be hampered more than 10t, then enters step (d)；
(d) it is risen with discharge capacity A/2 back reaming and is drilled into 10m above resistance hanging point, then to be drilled under reaming under discharge capacity A/4 under resistance hanging point
Square 10m, the stalling of termination of pumping later pull out of hole again: if resistance is hung less than 10t in trip-out process, having continued to be drilled into well depth X, enter step
(e)；If being hampered still above 10t, this step is repeated, until resistance when termination of pumping stalling pulls out of hole hangs and is less than 10t, is further continued for pulling out of hole
To well depth X, enter step (e)；
(e) at well depth X, with discharge capacity A circulation one week, it is drilled into Y under termination of pumping stalling, and rise be drilled at well depth X again；If
(Y-M) > 50m then enables Y=X, takes X '=(Y-M)/2+M；
(f) X is replaced with X ', repeats step (c)~(e), until (Y-M)≤50m；
(g) it pulls out of hole to the casing shoe of upper layer, with discharge capacity A/4 circulation one week in the casing shoe of upper layer, rises and be drilled into well head, trap
Pipe.
Embodiment 2:
Heterogeneous shale gas well Reservoir Section finishing drilling method as shown in Figure 1, on the basis of embodiment 1, discharge capacity A meets well
The annular space of bottom to upper layer casing shoe returns speed not less than 0.8m/s.The bit gauge protection of bottom drilling assembly is having a size of 8- in the present embodiment
1/2 ＂, drilling rod outer diameter 5 ＂, discharge capacity 2.5m3/ min can be calculated annular space at this time and return speed in the case where not considering wellbore amplification degree
1.92m/s.Due to the compaction stability and compactness of shale formation, wellbore amplification degree is aobvious and easy generally between 10~20%
See, annular space returns speed and can still be maintained on 1.6m/s.It is to be with A/2, i.e. 1.25m3The discharge capacity of/min is fallen
During reaming, it still is able to meet annular space and returns speed on 0.8m/s, the row's of returning ability of landwaste is fully ensured that.
Preferred embodiment is that the complete well head bag reserves 10m.The revolving speed of the back reaming is 40~50rpm, described
The revolving speed of lower reaming is 20~30rpm.It further include that logging operation is carried out before setting of casing.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (5)
1. heterogeneous shale gas well Reservoir Section finishing drilling method, which comprises the following steps:
(a) drilling to design well depth, stayed well head bag, be recycled to shaft bottom landwaste with discharge capacity A and return out to well head, complete full well by shaft bottom
The sieve residue log of section；Remember that bottom depth is Y, the depth of upper layer casing shoe is M, takes X=(Y-M)/2+M；
(b) back reaming pulls out of hole to upper layer casing shoe, recycles one week in the casing shoe of upper layer, is drilled into shaft bottom, prospect pit under termination of pumping stalling
Bottom sand setting height；Shaft bottom sand setting is destroyed, again drilling to design well depth, with discharge capacity A circulation one week；
(c) termination of pumping, which has stalled, is drilled into well depth X: if entering step (e) in trip-out process without the resistance hanging point within 10t；If pulling out of hole
There is resistance hanging point in the process, and be hampered more than 10t, then enters step (d)；
(d) it is risen with discharge capacity A/2 back reaming and is drilled into 10m above resistance hanging point, then to be drilled under reaming under discharge capacity A/4 below resistance hanging point
10m, the stalling of termination of pumping later pull out of hole again: if resistance is hung less than 10t in trip-out process, having continued to be drilled into well depth X, enter step
(e)；If being hampered still above 10t, this step is repeated, until resistance when termination of pumping stalling pulls out of hole hangs and is less than 10t, is further continued for pulling out of hole
To well depth X, enter step (e)；
(e) at well depth X, with discharge capacity A circulation one week, it is drilled into Y under termination of pumping stalling, and rise be drilled at well depth X again；(if Y-M)
> 50m, then enable Y=X, takes X '=(Y-M)/2+M；
(f) X is replaced with X ', repeats step (c)~(e), until (Y-M)≤50m；
(g) it pulls out of hole to the casing shoe of upper layer, with discharge capacity A/4 circulation one week in the casing shoe of upper layer, rises and be drilled into well head, setting of casing.
2. heterogeneous shale gas well Reservoir Section finishing drilling method according to claim 1, which is characterized in that discharge capacity A meets well
The annular space of bottom to upper layer casing shoe returns speed not less than 0.8m/s.
3. heterogeneous shale gas well Reservoir Section finishing drilling method according to claim 1, which is characterized in that the complete well head bag
Reserved 5~10m.
4. heterogeneous shale gas well Reservoir Section finishing drilling method according to claim 1, which is characterized in that the back reaming
Revolving speed is 40~50, and the revolving speed of the lower reaming is 20~30rpm.
5. heterogeneous shale gas well Reservoir Section finishing drilling method according to claim 1, which is characterized in that further include trapping
Logging operation is carried out before pipe.
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| CN111444637A (en) * | 2020-05-28 | 2020-07-24 | 洲际海峡能源科技有限公司 | Shale gas long-section horizontal well casing running safety evaluation method and system |
| CN116065950A (en) * | 2022-12-08 | 2023-05-05 | 大庆石油管理局有限公司 | Intelligent drilling construction process based on oil gas development engineering driller surface layer construction |
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