CN110374530A - A method of increasing tubing string depth of setting by changing tube fluid density - Google Patents
A method of increasing tubing string depth of setting by changing tube fluid density Download PDFInfo
- Publication number
- CN110374530A CN110374530A CN201910639867.4A CN201910639867A CN110374530A CN 110374530 A CN110374530 A CN 110374530A CN 201910639867 A CN201910639867 A CN 201910639867A CN 110374530 A CN110374530 A CN 110374530A
- Authority
- CN
- China
- Prior art keywords
- tubing string
- well
- rupture disk
- group
- depth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
Abstract
The present invention provides a kind of methods for increasing tubing string depth of setting by changing tube fluid density, by reducing normal pressure of the operation on horizontal segment casing in one section of air of horizontal segment tubing string inner sealing；Entering the above well section of window point, is filling clear water in tubing string, increase the gravity of the part tubing string.Two parts have been implemented in combination with the change to fluid density in tubing string, increase the gravity of vertical section tubing string, reduce horizontal segment tubing string to the pressure of casing, to increase tubing string depth of setting.
Description
Technical field
The invention belongs to exploration of oil and gas field and development technique field, and in particular to one kind is increased by changing tube fluid density
The method of oiling pipe string running depth.
Background technique
As horizontal well water hangs down than increasing, in casing tube well-completion horizontal well, tubing string tripping in is more and more difficult, often goes out
Existing phenomena such as tubing string tripping in is hampered, ground suspending weight is down to zero, this phenomenon shows that stiction suffered by tubing string is big
There is placed in the middle, eccentric, abutting internal surface of sleeve pipe in the resultant force on its axial direction suffered by tubing string, the state in pit shaft
Lower part, sinusoidal song are bent, helical curve is bent etc..
Currently, being respectively there are three types of the modes of solution problem above:
(1) tubing string weighting procedure: entering the above biggish oil pipe of well section tripping in unit weight of window point, such as unit length weight
2.875 inches of the oil pipe that 2.875 inches of the oil pipe substitution unit weight that amount is 16.5kg/m is 9.67kg/m, increases
Entire tubing string gravity.
(2) it drops frictional resistance joint method: as used metal drag reducer, reducing original flushing fluid (main component is water) wetting conditions
Coefficient of friction between setting of casing and tubing string increases tubing string depth of setting to reduce frictional force.
(3) coefficient of friction method is reduced, 1 drop frictional resistance is installed additional at interval of 1 or 2 oil pipes on horizontal segment tubing string and connects
Sliding friction is changed into rolling friction by head, to reduce coefficient of friction.
However, the method for tubing string depth of setting added above, which has tubing string, passively fills well because of law of connected vessels
The case where interior liquid, causes the depth of setting of tubing string to be obstructed, and the tripping in effect reached can not show a candle to be expected.
Summary of the invention
Embodiment of the present invention provides a kind of method for increasing tubing string depth of setting by changing tube fluid density,
Its purpose is first is that overcome the problems, such as that tubing string existing in the prior art passively fills liquid in well because of law of connected vessels；Its mesh
Second is that effectively improving the depth of setting of casing tube well-completion horizontal well.
Increase tubing string tripping in by changing tube fluid density in order to solve the above technical problems, the present invention provides one kind
The method of depth, comprising the following steps:
S1. select casing tube well-completion horizontal well as target well；
S2. it assembles horizontal segment tubing string: being sequentially connected gauguste cutter, the first rupture disk, A group tubing string and second from bottom to top
Rupture disk, complete horizontal segment tubing string assembling, transfer horizontal segment tubing string to target well in, it is ensured that the second rupture disk be located at into
Window point and horizontal segment tubing string inner sealing has air；
S3. before the second rupture disk of tripping in, B group tubing string is first connected in second rupture disk, then to B group oil pipe
Column injected clear water is transferred to target well simultaneously, and B group tubing string pushes horizontal segment tubing string mobile to shaft bottom, until horizontal segment oil
Tubing string is to artificial bottom of a well；
S4. the well head of installation targets well, and connect well-flushing pipeline and well washing equipment；
S5. well washing equipment is opened, the pump note clear water into B group tubing string is continued, is increased to the broken of the second rupture disk wait be pumped
When splitting starting pressure, stop pump note, waits until that the second rupture disk is broken；
S6. it is again turned on well washing equipment, to B group tubing string and A group tubing string the pump note clear water being connected to, is increased wait be pumped
When starting pressure to the rupture of the first rupture disk, stops pump note, wait until that the first rupture disk is broken；
S7. it keeps well washing equipment in the open state, improves pump note discharge capacity, Xiang You B group tubing string and horizontal segment tubing string
Pump note clear water, clear water return row from uplink in the annular space between target well tubing string and casing in the target well tubing string of composition
To ground, well-flushing is completed, while increasing the depth of setting of target tubing string.
Preferably, the length of A group tubing string is X in step S2, and X is the plug back total depth (PBTD) of target well and enters window point depth
Difference, unit m.
Further, as follows the step of assembling horizontal segment tubing string described in step S2:
S201. an oil pipe section is taken, gauguste cutter, the first rupture disk, oil pipe section and tripping in target well are sequentially connected；
S202. continuous connected pipes section lengthens target well oil pipe total length, until entering the overall length of the A group tubing string of well
Degree reaches Xm, and allowable error is ± 10m；
S203. the lower contact of the second rupture disk is connected in A group tubing string, completes the assembling of horizontal segment tubing string.
Preferably, the length of the B group tubing string in step S3 is Y, and Y is that target well enters window point depth, unit m.
Further, the step S3 is specifically included:
S301. an oil pipe section is taken to be connected in top connection and the tripping in target well of the second rupture disk；
S302. an oil pipe section is taken to be connected to the oil pipe section in step S301 again, to two oil above the second rupture disk
Clear water is filled in tube coupling, required clear water amount is the internal volume of two oil pipe sections；
S303. it takes two oil pipe sections to be connected in oil pipe section and the tripping in target well of step S301 again, then fills clear water,
Required clear water amount is the internal volume of two oil pipe sections；
S304. step S303 is repeated until completing the assembling of B group tubing string, and B group tubing string and horizontal segment tubing string form
Then target well tubing string transfers target well tubing string to artificial bottom of a well, while ensuring all to fill clear water in B group tubing string,
And the total length of B group tubing string reaches Ym.
Preferably, well washing equipment is risen with the displacement pump note clear water of 100L/min wait be pumped in the step S5 and step S6
To 25MPa, stop pump note, when pump pressure drops to 10MPa or less, shows that the first rupture disk or the second rupture disk are broken.
Further, the discharge capacity of well washing equipment pump note clear water is 600L/min in the step S7.
Further, first rupture disk is identical with the structure of second rupture disk, is by top connection, rupture diaphragm
It is formed with lower contact, the top connection and the lower contact offer fluid channel along longitudinal center line, the lower contact
One end is plugged in the fluid channel of top connection, and the rupture diaphragm is radially embedded in plug division and two fluid channels are close
Insulate from；The top connection is fixedly connected with the lower contact by holding screw, and in top connection inner wall and lower contact outer wall
Between be equipped with sealing ring.
Preferably, the holding screw shares 6, along the circumferential uniform intervals of the first rupture disk or the second rupture disk point
Cloth, the shear strength of each holding screw are 15 tons；The sealing ring shares 4.
Further, the maximum outside diameter of the gauguste cutter is the 98.5% of casing inner diameter.
Beneficial effects of the present invention are as follows:
The present invention is by reducing positive pressure of the operation on horizontal segment casing in one section of air of horizontal segment tubing string inner sealing
Power；Entering the above well section of window point, is filling clear water in tubing string, increase the gravity of the part tubing string.Two parts have been implemented in combination with to oil
The change of fluid density in tubing string increases the gravity of vertical section tubing string, reduces horizontal segment tubing string to the pressure of casing,
To increase tubing string depth of setting.
For above content of the invention can be clearer and more comprehensible, preferred embodiment is cited below particularly, and in conjunction with attached drawing, make detailed
It is described as follows.
Detailed description of the invention
Fig. 1 is the flow diagram for increasing the method for tubing string depth of setting by changing tube fluid density.
Fig. 2 is the flow diagram for assembling horizontal segment tubing string.
Fig. 3 is the flow diagram for assembling B group tubing string.
Fig. 4 is the structural schematic diagram of the target well tubing string of G.I.H.
Fig. 5 is the structural schematic diagram of the first rupture disk or the second rupture disk.
Description of symbols:
1. casing；2. gauguste cutter；3. the first rupture disk；4. the second rupture disk；5.A group tubing string；6.B group tubing string；7.
Artificial bottom of a well；8. top connection；9. rupture diaphragm；10. lower contact；11. holding screw；12. sealing ring.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this specification
Revealed content is understood other advantages and efficacy of the present invention easily.
Description introduces exemplary embodiments of the present invention, however, the present invention can use many different forms
Implement, and be not limited to the embodiment described herein, providing these embodiments is at large and fully disclose this
Invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.For the example being illustrated in the accompanying drawings
Term in property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached drawing
Label.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
First embodiment
Referring to Fig.1, the first embodiment of the present invention is related to one kind is increased under tubing string by changing tube fluid density
Enter the method for depth, comprising the following steps:
S1. select casing tube well-completion horizontal well as target well；
S2. it assembles horizontal segment tubing string: being sequentially connected gauguste cutter 2, the first rupture disk 3,5 and of A group tubing string from bottom to top
Second rupture disk 4 completes the assembling of horizontal segment tubing string, transfers in horizontal segment tubing string to target well, it is ensured that the second rupture disk 4
It is located at into window point and horizontal segment tubing string inner sealing has air；
S3. before the second rupture disk of tripping in 4, B group tubing string 6 is first connected in second rupture disk 4, then to B group
6 injected clear water of tubing string is transferred to target well simultaneously, and B group tubing string 6 pushes horizontal segment tubing string mobile to shaft bottom, until water
Flat section tubing string is to artificial bottom of a well 7；
S4. the well head of installation targets well, and connect well-flushing pipeline and well washing equipment；
S5. well washing equipment is opened, continues the pump note clear water into B group tubing string 6, is increased to the second rupture disk 4 wait be pumped
When rupture starting pressure, stop pump note, waits until that the second rupture disk 4 is broken；
S6. it is again turned on well washing equipment, to B group tubing string 6 and A group tubing string 5 the pump note clear water being connected to, is risen wait be pumped
When the rupture of up to the first rupture disk 3 starts pressure, stop pump note, waits until that the first rupture disk 3 is broken；
S7. it keeps well washing equipment in the open state, improves pump note discharge capacity, Xiang You B group tubing string 6 and horizontal segment tubing string
Pump note clear water in the target well tubing string (referring to Fig. 4) of composition, annular space of the clear water between target well tubing string and casing 1
Interior uplink, which is returned, drains into ground, completes well-flushing, while increasing the depth of setting of target tubing string.
Normally, the mode for increasing tubing string depth of setting causes passively to fill liquid in well because of law of connected vessels,
Present embodiment is unlike usual manner: in one section of air of horizontal segment tubing string inner sealing, reducing operation in horizontal segment set
Normal pressure on pipe；Enter the above well section of window point, filling clear water in tubing string, increases the gravity of the part tubing string, and then increase oil
Pipe string running depth.
Specifically, the purpose of step S2 is to compare sealing liquid in one section of air of horizontal segment tubing string inner sealing, and air is made
It is smaller with the normal pressure on horizontal segment casing；On the basis of the above, step S3~step S4 purpose is to enter window point or more
Tubing string in fill clear water, increase the gravity of the part tubing string, and then increase tubing string depth of setting.
Present embodiment is reached by changing tube fluid density in tubing string inner sealing air and injected clear water
Increase the purpose of tubing string depth of setting.
It should be strongly noted that the rupture of the rupture starting pressure and the first rupture disk 3 of the second rupture disk 4 starts pressure
Power, in particular to: when rupture disk is processed, pressure can be started according to the rupture of customer requirement, corresponding rupture disk is processed into, when broken
When splitting the practical pressure being subject to of disk more than or equal to rupture starting pressure, rupture disk is broken.Client can be according to oneself operation work
Condition, such as well depth, liquid properties etc. and technology type setting rupture starting pressure in well.
Second embodiment
Referring to Fig.1, second embodiment of the present invention is related to a kind of by changing under tube fluid density increase tubing string
Enter the method for depth, comprising the following steps:
S1. select casing tube well-completion horizontal well as target well；
S2. it assembles horizontal segment tubing string: being sequentially connected gauguste cutter 2, the first rupture disk 3,5 and of A group tubing string from bottom to top
Second rupture disk 4 completes the assembling of horizontal segment tubing string, transfers in horizontal segment tubing string to target well, it is ensured that the second rupture disk 4
It is located at into window point and horizontal segment tubing string inner sealing has air；
Specifically, as shown in Fig. 2, it is as follows the step of assembling horizontal segment tubing string described in step S2:
S201. an oil pipe section is taken, gauguste cutter 2, the first rupture disk 3, oil pipe section and tripping in target well are sequentially connected；
S202. continuous connected pipes section lengthens target well oil pipe total length, until entering the overall length of the A group tubing string 5 of well
Degree reaches Xm, and allowable error is ± 10m, and X is the plug back total depth (PBTD) of target well and the difference for entering window point depth, unit m；
S203. the lower contact of the second rupture disk 4 is connected in A group tubing string 5, completes the assembling of horizontal segment tubing string.
S3. before the second rupture disk of tripping in 4, B group tubing string 6 is first connected in second rupture disk 4, then to B group
6 injected clear water of tubing string is transferred to target well simultaneously, and B group tubing string 6 pushes horizontal segment tubing string mobile to shaft bottom, until water
Flat section tubing string is to artificial bottom of a well 7；
S4. the well head of installation targets well, and connect well-flushing pipeline and well washing equipment；
S5. well washing equipment is opened, continues the pump note clear water into B group tubing string 6, is increased to the second rupture disk 4 wait be pumped
When rupture starting pressure, stop pump note, waits until that the second rupture disk 4 is broken；
S6. it is again turned on well washing equipment, to B group tubing string 6 and A group tubing string 5 the pump note clear water being connected to, is risen wait be pumped
When the rupture of up to the first rupture disk 3 starts pressure, stop pump note, waits until that the first rupture disk 3 is broken；
S7. it keeps well washing equipment in the open state, improves pump note discharge capacity, Xiang You B group tubing string 6 and horizontal segment tubing string
Pump note clear water in the target well tubing string of composition, clear water in the annular space between target well tubing string and casing 1 uplink return
Ground is drained into, completes well-flushing, while increasing the depth of setting of target tubing string.
What present embodiment was different from the first embodiment is, it is determined that the specific steps of assembling horizontal segment tubing string, it is special
Be not define A group tubing string 5 total length X, X be target well plug back total depth (PBTD) with enter the difference of window point depth, also
It is to say, X is the length of target well horizontal segment, and air is closed in the A group tubing string 5 of X length, while acting on X length
Horizontal segment casing, the purpose is to reduce normal pressure of the operation on horizontal segment casing.
It should be noted that needing to prepare the oil that cumulative length is greater than maximum operation well depth before assembling each tubing string
Pipe, each oil pipe can be sequentially connected with by itself screw thread, not need additional crossover sub；The promotion for meeting operation well depth requirement is set
It is standby；Meet the well washing equipment of operation well depth requirement；Prepare the clear water that enough 2.5 times of wells hold；Prepare into well rupture disk connector and
Gauguste cutter；Prepare the nylon matter soft pipeline used that can pour water into oil pipe.
Third embodiment
Referring to Fig.1, second embodiment of the present invention is related to a kind of by changing under tube fluid density increase tubing string
Enter the method for depth, comprising the following steps:
S1. select casing tube well-completion horizontal well as target well；
S2. it assembles horizontal segment tubing string: being sequentially connected gauguste cutter 2, the first rupture disk 3,5 and of A group tubing string from bottom to top
Second rupture disk 4 completes the assembling of horizontal segment tubing string, transfers in horizontal segment tubing string to target well, it is ensured that the second rupture disk 4
It is located at into window point and horizontal segment tubing string inner sealing has air；
Specifically, as shown in Fig. 2, it is as follows the step of assembling horizontal segment tubing string described in step S2:
S201. an oil pipe section is taken, gauguste cutter 2, the first rupture disk 3, oil pipe section and tripping in target well are sequentially connected；
S202. continuous connected pipes section lengthens target well oil pipe total length, until entering the overall length of the A group tubing string 5 of well
Degree reaches Xm, and allowable error is ± 10m, and X is the plug back total depth (PBTD) of target well and the difference for entering window point depth, unit m；
S203. the lower contact of the second rupture disk 4 is connected in A group tubing string 5, completes the assembling of horizontal segment tubing string.
S3. before the second rupture disk of tripping in 4, B group tubing string 6 is first connected in second rupture disk 4, then to B group
6 injected clear water of tubing string is transferred to target well simultaneously, and B group tubing string 6 pushes horizontal segment tubing string mobile to shaft bottom, until water
Flat section tubing string is to artificial bottom of a well 7；
Referring to Fig. 3, specifically include:
S301. an oil pipe section is taken to be connected in top connection and the tripping in target well of the second rupture disk 4；
S302. an oil pipe section is taken to be connected to the oil pipe section in step S301 again, to two oil of 4 top of the second rupture disk
Clear water is filled in tube coupling, required clear water amount is the internal volume of two oil pipe sections；
S303. it takes two oil pipe sections to be connected in oil pipe section and the tripping in target well of step S301 again, then fills clear water,
Required clear water amount is the internal volume of two oil pipe sections；
S304. step S303 is repeated until completing the assembling of B group tubing string 6, B group tubing string 6 and horizontal segment tubing string group
At target well tubing string, target well tubing string is then transferred to artificial bottom of a well 7, while ensuring all to fill in B group tubing string 6 clearly
Water, and the total length of B group tubing string 6 reaches Ym, Y are that target well enters window point depth, unit m；
S4. the well head of installation targets well, and connect well-flushing pipeline and well washing equipment；
S5. well washing equipment is opened, continues the pump note clear water into B group tubing string 6, is increased to the second rupture disk 4 wait be pumped
When rupture starting pressure, stop pump note, waits until that the second rupture disk 4 is broken；
S6. it is again turned on well washing equipment, to B group tubing string 6 and A group tubing string 5 the pump note clear water being connected to, is risen wait be pumped
When the rupture of up to the first rupture disk 3 starts pressure, stop pump note, waits until that the first rupture disk 3 is broken；
S7. it keeps well washing equipment in the open state, improves pump note discharge capacity, Xiang You B group tubing string 6 and horizontal segment tubing string
Pump note clear water in the target well tubing string of composition, clear water in the annular space between target well tubing string and casing 1 uplink return
Ground is drained into, completes well-flushing, while increasing the depth of setting of target tubing string.
Present embodiment has determined the specific steps of assembling vertical section tubing string (B group tubing string 6), especially defines B
The total length Y, Y of group tubing string 6 are that target well enters window point depth, that is to say, that Y is the length of target well vertical section, Y length
B group tubing string 6 in fill clear water, increase the gravity of B group tubing string 6, when the second rupture disk 4 is crushed, clear water is to artificial
The direction in shaft bottom 7 is flowed, at this point, B group tubing string 6 drives A group tubing string 5 to artificial bottom of a well 7 under the action of flowing and gravity
Direction tripping in, to increase the depth of setting of target well tubing string.
It is noted that the maximum outside diameter of gauguste cutter 2 is the 98.5% of 1 internal diameter of casing as further optimization.
4th embodiment
Referring to Fig. 5, in present embodiment, first rupture disk 3 is identical with the structure of second rupture disk 4, is
It is made of top connection 8, rupture diaphragm 9 and lower contact 10, the top connection 8 and the lower contact 10 are offered along longitudinal center line
The one end of fluid channel, the lower contact 10 is plugged in the fluid channel of top connection 8, and the rupture diaphragm 9 is radially embedded in
It is sealed off in plug division and by two fluid channels；The top connection 8 and the lower contact 10 are fixed by holding screw 11
Connection, and sealing ring 12 is equipped between 10 outer wall of 8 inner wall of top connection and lower contact.
The holding screw 11 shares 6, and the circumferential direction along the first rupture disk 3 or the second rupture disk 4 is evenly spaced on, often
The shear strength of one holding screw 11 is 15 tons；The sealing ring 12 shares 4.
Specifically, in present embodiment, the first rupture disk 3 or the second rupture disk 4 are referred to as rupture disk, the material of rupture disk
For 35CoMo, 8 upper outside of top connection is machined with external screw thread, and 10 lower inside of lower contact is machined with internal screw thread, and screw thread specification is equal
For 27/8UPTBG.
For rupture diaphragm 9 when by the pressure for being greater than 35MPa, it is 1 centimetre tiny broken that rupture diaphragm 9, which is broken into maximum length,
Piece.Rupture diaphragm is technology well known to industry, is generally processed by specialized vendor, can be according to the rupture pressure break grade and shape ruler of client
Very little processing.
When assembling rupture disk, first rupture diaphragm 9 is fitted into top connection 8, then is inserted in the seal groove of lower contact 10 close
Seal 12, sealing ring totally 4, then be loaded into the lower contact 10 of sealing ring 12 and docked with top connection 8, finally in set screw hole 11
Middle installation holding screw, it is fixed by top connection 8 and lower contact 10.
Preferably, set screw hole 11 totally 6, using rupture disk central axes as axial symmetry, 6 set screw holes are same
Uniformly distributed on circle, the shear strength of each holding screw is 15 tons.
Sixth embodiment
The side for increasing tubing string depth of setting by changing tube fluid density that present embodiment is protected according to the present invention
Method, using Mr. Yu's horizontal well, the plug back total depth (PBTD) 4500m of the well enters window point depth 2000m, production string internal diameter
2.875 inches of oil pipes progress through wash well work of 124.26mm, proposed adoption outer diameter 73.02mm, internal diameter 62.0mm, wall thickness 5.51mm
Industry.
Drifting tubular column structure (target well tubing string) is from the bottom to top successively are as follows:
Maximum outside diameter 122mm gauguste cutter, the first rupture disk of outer diameter 95mm, 2.875 inches of oil pipes (A group tubing string)
2500m, the second rupture disk of outer diameter 95mm, 2.875 inches of oil pipe (B group tubing string) 2000m.
By maximum outside diameter 122mm gauguste cutter+outer diameter 95mm+2.875 inches of oil pipes of the first rupture disk (A group tubing string)
The second rupture disk of 2500m+ outer diameter 95mm is sequentially connected from bottom to top as horizontal segment tubing string, G.I.H；Continue tripping in 2
Oil pipe (B group tubing string) pours into clear water in oil pipe pipe, and the clear water amount of pouring into is the internal volume of 2 oil pipes, repeats the above steps, directly
Extremely by tubing string tripping in artificial bottom of a well.
After tubing string tripping in, well head, connection pump note pipeline are installed.The pump note clear water into oil pipe, discharge capacity 100L/min,
After pump pressure rises to 26MPa, stop pump note, pump pressure is down to 0.5MPa after 1S；Continue pump note clear water, discharge capacity 100L/ into oil pipe
Min after pump pressure rises to 27MPa, stops pump note, and pump pressure is down to 0.8MPa after 2S；
With the discharge capacity of 600L/min, direct flushing is carried out with clear water.By pumping note clear water in oil pipe, clear water is by oil pipe and set
Annular space uplink between pipe simultaneously returns to ground, well-flushing to qualification.
Using scheme provided by the invention, for more conventional tubing string, the normal pressure acted on horizontal segment casing is reduced
Value is 75341.18N (calculating by formula one)；Second rupture disk (top) above tubing string acts on the axial work on the tubing string of lower part
The value added for (not installing rupture disk pipe nipple on tubing string) when not blocking firmly is 120701.6N (calculating by formula two).
Above-mentioned formula one and formula two, specific calculation are as follows:
Tubing string between second rupture disk 4 (top) and the first rupture disk 3 (lower part) acts on horizontal segment casing
Normal pressure is smaller, and the normal pressure that two sections of tubing strings not blocked of equal length act on horizontal segment casing is larger, the difference of the two
Value calculates as follows:
2 rupture disk pipe nipples are installed in the lower part of tubing string, block this part tubing string, the oil that both ends are blocked from both ends
What tubing string inner cavity poured into is the air under normal temperature and pressure, the gravity of the air of the part tubing string and its inner sealing such as following formula institute
Show:
1.29×10×(Xπr2)+X×a×10
Its suffered buoyancy in clear water of the tubing string that the part both ends are blocked, is calculated as follows:
1000×10×XπR2
Two sections of tubing strings blocked its gravity subtracts the value of suffered buoyancy in the wellbore are as follows:
1.29×10×(Xπr2)+X × a × 10-1000 × 10 × X π R2
The difference of two sections of its gravity of the tubing string not blocked of equal length and buoyancy is calculated as follows, wherein liquid level in pit shaft
It is counted to well head: 1000 × 10 × X π (R2-r2)+X×a×10
Therefore, for the tubing string that both ends of the tubing string compared with Xm long that the both ends of Xm long are blocked do not block, work can be reduced
Used in the normal pressure of horizontal segment casing, it is calculated as follows:
(1000-1.29) × 10 × X π r2--- --- --- --- --- -- formula one
In the step two and step 3,3. the above tubing string acts on the tubing string of lower part rupture disk pipe nipple (top)
The value added for (not installing rupture disk pipe nipple on tubing string) when axial force does not block, which is calculated as follows, (ignores air weight
Power):
2×10×1000×Yπr2--- --- --- --- --- -- formula two
It is above it is various in:
1.29 be atmospheric density, kg/m3；
X is that horizontal well plug back total depth (PBTD) subtracts the value into window point depth, m；
Y is the value that horizontal well enters window point depth, m；
π is constant, value 3.14；
R is pipe aperture (radius), m；
10 be gravity constant, N/kg；
R is oil pipe outer diameter (radius), m；
A is oil pipe unit weight, kg/m.
1000 be clear water density, kg/m3。
In conclusion the present invention is by reducing operation in horizontal segment set in one section of air of horizontal segment tubing string inner sealing
Normal pressure on pipe；Entering the above well section of window point, is filling clear water in tubing string, increase the gravity of the part tubing string.Two parts combine
The change to fluid density in tubing string is realized, the gravity of vertical section tubing string is increased, reduces horizontal segment tubing string pair
The pressure of casing, to increase tubing string depth of setting.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of method for increasing tubing string depth of setting by changing tube fluid density, which is characterized in that including following step
It is rapid:
S1. select casing tube well-completion horizontal well as target well；
S2. it assembles horizontal segment tubing string: being sequentially connected gauguste cutter (2), the first rupture disk (3), A group tubing string (5) from bottom to top
With the second rupture disk (4), the assembling of horizontal segment tubing string is completed, is transferred in horizontal segment tubing string to target well, it is ensured that second is broken
Split that disk (4) is located at into window point and horizontal segment tubing string inner sealing has air；
S3. before the second rupture disk of tripping in (4), B group tubing string (6) second rupture disk of Yu Suoshu (4) is first connected, then to B
Group tubing string (6) injected clear water is transferred to target well simultaneously, and B group tubing string (6) pushes horizontal segment tubing string mobile to shaft bottom,
Up to horizontal segment tubing string to artificial bottom of a well (7)；
S4. the well head of installation targets well, and connect well-flushing pipeline and well washing equipment；
S5. well washing equipment is opened, continues the pump note clear water into B group tubing string (6), is increased to the second rupture disk (4) wait be pumped
When rupture starting pressure, stop pump note, waits until that the second rupture disk (4) are broken；
S6. it is again turned on well washing equipment, to B group tubing string (6) and A group tubing string (5) the pump note clear water being connected to, is risen wait be pumped
When the rupture of up to the first rupture disk (3) starts pressure, stop pump note, waits until that the first rupture disk (3) are broken；
S7. it keeps well washing equipment in the open state, improves pump note discharge capacity, Xiang You B group tubing string (6) and horizontal segment tubing string group
At target well tubing string in pump note clear water, clear water in the annular space between target well tubing string and casing (1) uplink return
Ground is drained into, completes well-flushing, while increasing the depth of setting of target tubing string.
2. the method as described in claim 1 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In the length of A group tubing string (5) is X in step S2, and X is the plug back total depth (PBTD) of target well and the difference for entering window point depth, list
Position is m.
3. the method as claimed in claim 2 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In the step of assembling horizontal segment tubing string described in step S2 is as follows:
S201. an oil pipe section is taken, gauguste cutter (2), the first rupture disk (3), oil pipe section and tripping in target well are sequentially connected；
S202. continuous connected pipes section lengthens target well oil pipe total length, until entering the total length of the A group tubing string (5) of well
Reach Xm, allowable error is ± 10m；
S203. the lower contact of the second rupture disk (4) is connected in A group tubing string (5), completes the assembling of horizontal segment tubing string.
4. the method as claimed in claim 3 for increasing tubing string depth of setting by changing tube fluid density, feature exist
It is Y in the length of, the B group tubing string (6) in step S3, Y is that target well enters window point depth, unit m.
5. the method as claimed in claim 4 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In the step S3 is specifically included:
S301. an oil pipe section is taken to be connected in top connection and the tripping in target well of the second rupture disk (4)；
S302. an oil pipe section is taken to be connected to the oil pipe section in step S301 again, to two oil pipes above the second rupture disk (4)
Clear water is filled in section, required clear water amount is the internal volume of two oil pipe sections；
S303. it takes two oil pipe sections to be connected in oil pipe section and the tripping in target well of step S301 again, then fills clear water, it is required
Clear water amount is the internal volume of two oil pipe sections；
S304. step S303 is repeated until completing the assembling of B group tubing string (6), B group tubing string (6) and horizontal segment tubing string group
At target well tubing string, target well tubing string is then transferred to artificial bottom of a well (7), while ensuring all to fill in B group tubing string (6)
Qing Dynasty's water, and the total length of B group tubing string (6) reaches Ym.
6. the method as described in claim 1 for increasing tubing string depth of setting by changing tube fluid density, feature exist
Well washing equipment is stopped after being pumped and rising to 25MPa in, the step S5 and step S6 with the displacement pump note clear water of 100L/min
Only pump note when pump pressure drops to 10MPa or less, shows that the first rupture disk (3) or the second rupture disk (4) are broken.
7. the method as described in claim 1 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In the discharge capacity of well washing equipment pump note clear water is 600L/min in the step S7.
8. the method for increasing tubing string depth of setting by changing tube fluid density as described in claim 1 or 3 or 5,
It is characterized in that, first rupture disk (3) is identical with the structure of second rupture disk (4), is by top connection (8), rupture
It is logical that piece (9) and lower contact (10) composition, the top connection (8) and the lower contact (10) offer fluid along longitudinal center line
The one end in road, the lower contact (10) is plugged in the fluid channel of top connection (8), and the rupture diaphragm (9) is radially embedded in
It is sealed off in plug division and by two fluid channels；The top connection (8) and the lower contact (10) pass through holding screw
(11) it is fixedly connected, and is equipped with sealing ring (12) between top connection (8) inner wall and lower contact (10) outer wall.
9. the method as claimed in claim 8 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In, the holding screw (11) shares 6, and the circumferential direction along the first rupture disk (3) or the second rupture disk (4) is evenly spaced on,
The shear strength of each holding screw (11) is 15 tons；The sealing ring (12) shares 4.
10. the method as described in claim 1 for increasing tubing string depth of setting by changing tube fluid density, feature exist
In the maximum outside diameter of the gauguste cutter (2) is the 98.5% of casing (1) internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910639867.4A CN110374530A (en) | 2019-07-16 | 2019-07-16 | A method of increasing tubing string depth of setting by changing tube fluid density |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910639867.4A CN110374530A (en) | 2019-07-16 | 2019-07-16 | A method of increasing tubing string depth of setting by changing tube fluid density |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110374530A true CN110374530A (en) | 2019-10-25 |
Family
ID=68253343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910639867.4A Pending CN110374530A (en) | 2019-07-16 | 2019-07-16 | A method of increasing tubing string depth of setting by changing tube fluid density |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110374530A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434681A (en) * | 2021-06-04 | 2022-12-06 | 中国石油天然气股份有限公司 | Deep well and ultra-deep well fracturing casing protection method and operation process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080185157A1 (en) * | 2007-02-07 | 2008-08-07 | Bj Services Company | System and method for a low drag flotation system |
| US7549479B2 (en) * | 2004-12-10 | 2009-06-23 | Exxonmobil Upstream Reseach Company | Tubular flotation with pressurized fluid |
| CN201567960U (en) * | 2009-12-16 | 2010-09-01 | 中国石油集团渤海钻探工程有限公司 | Floating casing pipe installing pipe series |
| CN205605160U (en) * | 2016-05-05 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司 | Formula of breaking tail pipe blanking plug |
| US20170096875A1 (en) * | 2015-10-06 | 2017-04-06 | NCS Multistage, LLC | Tubular airlock assembly |
| CN107165587A (en) * | 2017-06-19 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | A kind of floating coupling device and sleeve pipe pay-off method |
| CN109611060A (en) * | 2018-11-26 | 2019-04-12 | 中国海洋石油集团有限公司 | A kind of floating screen casing |
| CN109611061A (en) * | 2018-11-29 | 2019-04-12 | 中国海洋石油集团有限公司 | A method of floating tripping in screen casing |
-
2019
- 2019-07-16 CN CN201910639867.4A patent/CN110374530A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7549479B2 (en) * | 2004-12-10 | 2009-06-23 | Exxonmobil Upstream Reseach Company | Tubular flotation with pressurized fluid |
| US20080185157A1 (en) * | 2007-02-07 | 2008-08-07 | Bj Services Company | System and method for a low drag flotation system |
| CN201567960U (en) * | 2009-12-16 | 2010-09-01 | 中国石油集团渤海钻探工程有限公司 | Floating casing pipe installing pipe series |
| US20170096875A1 (en) * | 2015-10-06 | 2017-04-06 | NCS Multistage, LLC | Tubular airlock assembly |
| CN205605160U (en) * | 2016-05-05 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司 | Formula of breaking tail pipe blanking plug |
| CN107165587A (en) * | 2017-06-19 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | A kind of floating coupling device and sleeve pipe pay-off method |
| CN109611060A (en) * | 2018-11-26 | 2019-04-12 | 中国海洋石油集团有限公司 | A kind of floating screen casing |
| CN109611061A (en) * | 2018-11-29 | 2019-04-12 | 中国海洋石油集团有限公司 | A method of floating tripping in screen casing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115434681A (en) * | 2021-06-04 | 2022-12-06 | 中国石油天然气股份有限公司 | Deep well and ultra-deep well fracturing casing protection method and operation process |
| CN115434681B (en) * | 2021-06-04 | 2023-09-22 | 中国石油天然气股份有限公司 | Deep well and ultra-deep well fracturing sleeve protection method and operation flow |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2513926A1 (en) | A tool for fluid filling and circulation during oilfield well tubing | |
| CN110374552A (en) | Passage method is established on a kind of big orifice toe-end sliding sleeve and wellbore casing and stratum | |
| CN204532234U (en) | Sliding sleeve of bushing and waterpower bridging plug combined type completion tubular column | |
| CN105178908B (en) | The chemical grouting packing device and method of down-hole formation closure | |
| CN201786270U (en) | Automatic liquid filling double-layer combined casing pipe | |
| CN110374530A (en) | A method of increasing tubing string depth of setting by changing tube fluid density | |
| CN103184851A (en) | Plugging technology for highly-deviated well with big casing pipe | |
| CN211692803U (en) | Anti-scale screw pump | |
| CN102913160A (en) | Continuous circulation drilling well system | |
| CN201843571U (en) | Oil drainage type packer | |
| CN201363114Y (en) | Casing patch device | |
| CN107869327B (en) | Coal-bed gas well under-pressure well washing method with fixed pipe column | |
| CN113622865B (en) | Tail pipe pressure control well cementation method under packer setting condition | |
| CN106368638B (en) | Casing damage capping tools and method for blocking | |
| CN206636537U (en) | Well head backward flowing preventing device | |
| CN109339734A (en) | A kind of packer for annular space pipeline | |
| CN208669280U (en) | A kind of coiled tubing built-in pneumatic water drainage gas production device | |
| CN207177824U (en) | A kind of current limliting opening device | |
| CN209308665U (en) | A kind of broken well oil recovery flow string of set | |
| CN112483065A (en) | Sand setting device and method | |
| CN105863573A (en) | Self-lubricating anti-wax and anti-scale type oil production string | |
| RU2420655C1 (en) | Procedure for prevention of wellhead freezing in pressure well | |
| CN104563957A (en) | Horizontal well cementing sleeve and method for measuring well cementing quality | |
| CN201209431Y (en) | Oil well big-diameter hydraulic unloading deep pumping device | |
| CN204457588U (en) | Horizontal cementing sleeve pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201030 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1203 Applicant before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. Applicant before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191025 |