CN107939318B - Local under balance pressure drilling reflux - Google Patents
Local under balance pressure drilling reflux Download PDFInfo
- Publication number
- CN107939318B CN107939318B CN201711233685.4A CN201711233685A CN107939318B CN 107939318 B CN107939318 B CN 107939318B CN 201711233685 A CN201711233685 A CN 201711233685A CN 107939318 B CN107939318 B CN 107939318B
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- Prior art keywords
- drill bit
- coiled tubing
- reflux
- drilling
- pipe fitting
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention discloses a kind of local under balance pressure drilling reflux, which includes：Coiled tubing is connected to the coiled tubing connector of coiled tubing lower end；The continuous pipe fitting being set in outside coiled tubing connector, the continuous pipe fitting are connected together with the coiled tubing connector；The drill bit top connection being set in outside the continuous pipe fitting is formed with annular chamber, bearing is provided in the annular chamber between the drill bit top connection and the continuous pipe fitting；It is connected to the drill bit of drill bit top connection lower end；It is provided with nozzle on the drill bit；It is connected to the reflux pipe nipple of drill bit top connection upper end；It is provided with return port on the side wall of the reflux pipe nipple；The upper end is connected with drilling rod；The coiled tubing is to the inner flow passage for being formed with perforation between the drill bit.When carrying out drilling well using the present invention, in shaft bottom part under the premise of under balance pressure drilling, realizes that micro-loop outage effect takes rock, can ensure top well section hole stability, preferably realize well control, be conducive to improve bit speed.
Description
Technical field
The present invention relates to petroleum drilling technology field, more particularly to a kind of local under balance pressure drilling reflux.
Background technology
With a wide range of exploitation of the fossil energies such as oil gas, at present people concern is primarily with during exploitation how
Mitigate formation damage.Under balance pressure drilling is widely used in the above context.Specifically, under balance pressure drilling is a kind of energy
The drilling technology for the problems such as enough improving drilling speed and reducing the leakage in failure oil reservoir.Compared with conventional method horizontal well drilling, use
Under-balanced drilling technology can not only make horizontal well production improve 10 times or so, but also underbalance DRILLING WITH COILED TUBING has
Unique superiority, suitable shallow oil-gas Layer, slimhole drilling, the intensification of old well and sidetracking, especially low pressure or Depleted Reservoirs
Sidetrack horizontal well.
Currently, during under balance pressure drilling, since fluid pressure is less than strata pressure, the formation rock in well in pit shaft
Negative Pressure Difference is formd with wellbore, this pressure difference can make the stress of rock in well change, collapse so as to cause wellbore, cause card
Thus brill or caliper expansion increase drilling cost, or even influence to be drilled into destination layer.That is, under balance pressure drilling at present is main
There are the problem of how to ensure hole stability, preferably realize well control.
It is very crucial under balance pressure drilling to solve well control problem.It is to utilize swivel control head control under balance pressure drilling
Fluid flowing processed carries out the operation of drilling well, and strata pressure is relatively high in addition, increases the ground blowout caused by equipment fault
Risk out of control.
For the above problem in the prior art, it is necessary to a kind of local under balance pressure drilling reflux is provided, to ensure
Hole stability preferably realizes well control.
Invention content
The object of the present invention is to provide a kind of local under balance pressure drilling refluxes, can be in the under balance pressure drilling of shaft bottom part
Under the premise of, it realizes that micro-loop outage effect takes rock, ensures top well section hole stability, preferably realize well control, be conducive to improve drilling well
Speed.
Following technical proposal can be used to realize in the above-mentioned purpose of the present invention：
A kind of part under balance pressure drilling reflux, including：
Coiled tubing；
It is connected to the coiled tubing connector of the coiled tubing lower end；
The continuous pipe fitting being set in outside the coiled tubing connector, the continuous pipe fitting and the coiled tubing connector
It is connected together；
The drill bit top connection being set in outside the continuous pipe fitting, between the drill bit top connection and the continuous pipe fitting
It is formed with annular chamber, bearing is provided in the annular chamber；
It is connected to the drill bit of drill bit top connection lower end；It is provided with nozzle on the drill bit；
It is connected to the reflux pipe nipple of the top connection upper end；It is provided with return port on the side wall of the reflux pipe nipple；Thereon
End is connected with drilling rod；
The coiled tubing is to the inner flow passage for being formed with perforation between the drill bit；Drilling well liquid energy flows through the inner flow passage extremely
The nozzle sprays, and carries shaft bottom landwaste and is entered by the return port in the annular space of the coiled tubing and the drilling rod.
In one preferred embodiment, the inner flow passage by the coiled tubing, the part coiled tubing connector,
Continuous pipe fitting and drill bit top connection and the drill bit are formed.
In one preferred embodiment, further include clamp spring, the first card is provided on the coiled tubing connector outer wall
Conjunction portion is provided with the second holding section that the clamp spring is set for card, the coiled tubing connector on the continuous pipe fitting inner wall
It is fastened by the clamp spring with the continuous pipe fitting.
In one preferred embodiment, further include the locating piece being fixed on outside the coiled tubing, the locating piece
Lower end can be fastened at least one upper end of the coiled tubing connector, continuous pipe fitting, when the lower end quilt of the locating piece
When engaging, the clamp spring is caught in first holding section.
In one preferred embodiment, the locating piece includes two positions semi-rings mutually spliced, the positioning half
Ring is fixed by screws on the outer wall of the coiled tubing.
In one preferred embodiment, the coiled tubing connector is in integrally hollow revolving body, the hollow portion
It is divided into through hole, the coiled tubing connector is formed with limiting section on inner wall, and the limiting section is for limiting the continuous oil
The axial direction of pipe moves down distance.
In one preferred embodiment, it is provided with the first groove on the outer wall of the coiled tubing connector, described
It is additionally provided with sealing ring in one groove.
In one preferred embodiment, the continuous pipe fitting is in integrally hollow revolving body, the hollow space
For through hole, it is provided with the second groove on the outer wall of the continuous pipe fitting, sealing ring is additionally provided in second groove.
In one preferred embodiment, the drill bit top connection is in integrally hollow revolving body, the hollow space
For through hole, be formed in the drill bit top connection for against the bearing the first limiting section and for against described continuous
Second limiting section of pipe fitting lower end.
In one preferred embodiment, the drilling rod, reflux pipe nipple, drill bit top connection, drill bit are connected through a screw thread,
The rotary power of drilling machine is transferred to the drill bit by the drilling rod, reflux pipe nipple, drill bit top connection.
In one preferred embodiment, packer is provided on the drilling rod, the packer is described for insulating
The density of the annular space formed between pit shaft where drilling rod and the drilling rod, the packer drilling fluid below is less than the envelope
Every the density of the above drilling fluid of device, local under balance pressure drilling is formed.
In one preferred embodiment, the drill bit top connection is integrally formed with the drill bit.
The features and advantages of the invention are：A kind of local under balance pressure drilling reflux is provided in the application embodiment,
The micro-loop sky for the drilling fluid for the cutting carring that circulates is cooperatively formed by inside and outside component, so as to reach following technologies effects
Fruit：
(1) it can realize that Transport of Drilling Cutting In A passes back into the micro-loop sky that coiled tubing is formed with drilling rod, due to micro-loop sky
Flow area is small, and inside and outside wall surface is steel, and frictional force is small, and interior drilling well flow velocity is high, is conducive to take rock, and then improve and bore
Well speed reduces the generation of the down-hole accidents such as desilting bit freezing, reduces drilling cost.
(2) underground part underbalance in drilling process may be implemented by the device, bit speed, protection oil can be improved
Gas reservoir improves yield, additionally it is possible to maintain top well section or bad ground hole stability, reduce the accidents such as well slough, blowout hair
It is raw.
(3) the nearly drill bit part underbalance in shaft bottom, low density drilling fluid impact shaft bottom after drill bit ejection, carry shaft bottom landwaste
Among returning the annular space that drill bit top connection is formed with the borehole wall, then by the return port for the pipe nipple that flows back, into coiled tubing and brill
The micro-loop that bar is formed is empty, returns out ground in the air from micro-loop, shortens with borehole wall contact-segment, and well control problem also with regard to relative simplicity, reduces
The expense of equipment investment and the ground blowout out of control equivalent risk caused by equipment fault, ensured rig personnel's person and
The safety of property.
With reference to following description and accompanying drawings, the particular implementation of the application is disclosed in detail, specifies the original of the application
Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in range.In appended power
In the range of the spirit and terms that profit requires, presently filed embodiment includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It is used in a other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of part under balance pressure drilling reflux in the application embodiment.
Fig. 2 is a kind of front view of coiled tubing connector in the application embodiment；
Fig. 3 is a kind of sectional view of coiled tubing connector in the application embodiment；
Fig. 4 is a kind of front view of continuous pipe fitting in the application embodiment；
Fig. 5 is a kind of sectional view of continuous pipe fitting in the application embodiment.
Reference sign：
1- coiled tubings, 2- reflux pipe nipples, 3- sealing rings, 4- positions semi-rings, 5- screws, the continuous pipe fittings of 6-, 7- clamp springs,
8- coiled tubing connectors, 9- bearings, 10- drill bit top connections, 11- drill bits, 20- return ports, 21- nozzles, the first holding sections 81-,
The second holding sections 61-, 82- limiting sections, the first grooves of 83-, the second grooves of 62-.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, elaborate to technical scheme of the present invention, it should be understood that these
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention, after having read the present invention, this field skill
Art personnel each fall in the application range as defined in the appended claims the modification of the various equivalent forms of the present invention.
It should be noted that when element is referred to as " being set to " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", "upper",
"lower", "left", "right" and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant Listed Items.
The present invention provides a kind of local under balance pressure drilling reflux, can under the premise of the under balance pressure drilling of shaft bottom part,
It realizes that micro-loop outage effect takes rock, ensures top well section hole stability, preferably realize well control, be conducive to improve bit speed.
It please refers to Fig.1 to Fig. 5, a kind of local under balance pressure drilling reflux provided in the application embodiment can wrap
It includes：Coiled tubing 1；It is connected to the coiled tubing connector 8 of 1 lower end of the coiled tubing；It is set in outside the coiled tubing connector 8
Continuous pipe fitting 6, the continuous pipe fitting 6 fastens with the coiled tubing connector 8；It is set in the continuous pipe fitting 6
Outer drill bit top connection 10 is formed with annular chamber, the annular chamber between the drill bit top connection 10 and the continuous pipe fitting 6
Inside it is provided with bearing 9；Drill bit 11 in 10 lower end of drill bit top connection is set；Nozzle 21 is provided on the drill bit 11；Even
It is connected on the reflux pipe nipple 2 of the top connection upper end；It is provided with return port 20 on the side wall of the reflux pipe nipple 2；The upper end connects
There is drilling rod；The coiled tubing 1 is to the inner flow passage for being formed with perforation between the drill bit 11；Drilling well liquid energy flows through the inner flow passage
It is sprayed to the nozzle 21, carries the ring that shaft bottom landwaste enters the coiled tubing 1 and the drilling rod by the return port 20
In the air.Wherein, the annular space that the inner wall of the outer wall of the coiled tubing 1 and the drilling rod is formed is that the smaller micro-loop of size is empty.
In the present embodiment, the inner flow passage is by the coiled tubing 1, the part coiled tubing connector 8, continuous pipe
Connector 6 and drill bit top connection 10 and the formation of the drill bit 11.Drilling fluid after slush pump pumps out, pass sequentially through coiled tubing 1,
The nozzle 21 of coiled tubing connector 8, continuous pipe fitting 6, drill bit top connection 10, drill bit 11, drilling fluid from drill bit 11 is spouting,
Shaft bottom is impacted, shaft bottom landwaste is carried and returns drill bit top connection 10 among the annular space of borehole wall formation, then pass through the pipe nipple 2 that flows back
Return port 20, the micro-loop formed into coiled tubing 1 and drilling rod is empty, and ground is returned out in the air from micro-loop.
In the present embodiment, packer is provided on the drilling rod, the packer is for insulating the drilling-rod external wall
The density of the annular space formed between the shaft in wall where the drilling rod, the packer drilling fluid below is less than the envelope
Every the density of the above drilling fluid of device, local under balance pressure drilling is formed.
The part under balance pressure drilling reflux can be made of inside and outside two parts on the whole.
Wherein, outside includes mainly：Flow back pipe nipple 2 and drill bit top connection 10.Wherein, reflux pipe nipple 2 is whole in hollow
Jatharapanvartanasana ontology, is provided with return port 20 on the ontology, the number of the return port 20 can be it is multiple, it is short along the reflux
Section 2 is arranged circumferentially.The return port 20 can have certain inclined direction so that shaft bottom landwaste can pass through this
The entrance coiled tubing 1 of return port 20 and the micro-loop that drilling rod is formed are aerial.The upper end of the reflux pipe nipple 2 is provided with female thread, for
Drilling rod is connected；Lower end is provided with pin thread, for being connect with the female thread of drill bit top connection 10.10 lower end of drill bit top connection is provided with
Female thread can connect drill bit 11.10 inside of drill bit top connection is equipped with continuous pipe fitting 6, continuous pipe fitting 6 and drill bit top connection 10
Between have rolling bearing 9, can relatively rotate；Continuously there is sealing ring 3 between pipe fitting 6 and drill bit top connection 10, it can be ensured that
The two mutually rotates leakproofness simultaneously.
Specifically, the drill bit top connection 10 can be in integrally hollow revolving body, the hollow space is through hole, institute
State be formed in drill bit top connection 10 for against the bearing 9 the first limiting section and for against the continuous pipe fitting 6
Second limiting section of lower end.
In use, the drilling rod, reflux pipe nipple 2, drill bit top connection 10, drill bit 11 are connected through a screw thread, the rotation of drilling machine
Power is transferred to the drill bit 11 by the drilling rod, reflux pipe nipple 2, drill bit top connection 10.The drill bit 11 is specifically as follows
PDC drill bit.
Macro in one embodiment, the drill bit 11 can be integrally formed with the drill bit top connection 10, general to improve
The intensity of the part under balance pressure drilling reflux bottom optimizes overall structure.
Inside includes mainly：Coiled tubing 1 etc..1 lower end of coiled tubing can be connected through a screw thread coiled tubing connector
8.The continuous pipe fitting 6 is connected together with the coiled tubing connector 8.
Specifically, the part under balance pressure drilling reflux can also include clamp spring 7,8 outer wall of coiled tubing connector
On be provided with the first holding section 81, the second holding section that the clamp spring 7 is set for card is provided on 6 inner wall of continuous pipe fitting
61, the coiled tubing connector 8 and the continuous pipe fitting 6 are fastened by the clamp spring 7.Above by coiled tubing 1
Upper installation clamp spring 7 realizes the mode that coiled tubing connector 8 engages with continuous pipe fitting 6, can reduce the difficulty of installation, improve peace
The efficiency of dress.Specifically, in order to ensure reliability that coiled tubing connector 8 engages with continuous pipe fitting 6, of the clamp spring 7
Number can be two and axially be spaced apart.
Further, which can also include being fixed on outside the coiled tubing 1 to determine
Position part, the lower end of the locating piece can be fastened at least one upper end of the coiled tubing connector 8, continuous pipe fitting 6, work as institute
State locating piece lower end it is engaged when, the clamp spring 7 is caught in first holding section 81.Specifically, the locating piece includes phase
Two positions semi-rings 4 of splicing, the positions semi-ring 4 are fixed on by screw 5 on the outer wall of the coiled tubing 1.
It can be fixed with two with hexagon socket countersunk flat cap head screw 5 outside the coiled tubing 1 above the coiled tubing connector 8
A positions semi-ring 4, there are two clamp springs 7 for dress on coiled tubing connector 8, realize internal and external parts connection and positioning.Above-mentioned setting positioning
The effect of semi-ring 4 is to ensure that inserting depth, prevents from being inserted into too deep, influences connection effect；It can make coiled tubing connector 8 not simultaneously
It is close to drilling rod inner wall, realizes accurate convenient inserting.
Fig. 2 and Fig. 3 are please referred to, specifically, it is in hollow revolving body that the coiled tubing connector 8 is whole, in described
Empty part is through hole.The coiled tubing connector 8 is formed with limiting section 82 on inner wall, and the limiting section 82 is for limiting institute
The axial direction for stating coiled tubing 1 moves down distance.
In one embodiment, the first groove 83 is also provided on the outer wall of the coiled tubing connector 8, it is described
It is additionally provided with sealing ring 3 in first groove 83.The sealing ring 3 is for ensureing the coiled tubing connector 8 and the continuous pipe
The leakproofness of 6 cooperation position of connector.
Fig. 4 and Fig. 5 are please referred to, in one embodiment, the whole continuous pipe fitting 6 is in hollow revolution
Body, the hollow space are through hole, and the second groove 62, second groove are provided on the outer wall of the continuous pipe fitting 6
Sealing ring 3 is additionally provided in 62.The sealing ring 3 is for ensureing that the continuous pipe fitting 6 coordinates with the drill bit top connection 10
The leakproofness of position.Specifically, the number of second groove 62 can be multiple, such as it can be two, two second recessed
Slot 62 axially arranged for interval preferably to ensure the sealing between the continuous pipe fitting 6 and the drill bit top connection 10
Property.
Compared with prior art, local under balance pressure drilling reflux provided by the invention has the advantages that：
(1) it can realize that Transport of Drilling Cutting In A passes back into the micro-loop sky that coiled tubing 1 is formed with drilling rod, due to micro-loop sky
Flow area is small, and inside and outside wall surface is steel, and frictional force is small, and interior drilling well flow velocity is high, is conducive to take rock, and then improve and bore
Well speed reduces the generation of the down-hole accidents such as desilting bit freezing, reduces drilling cost.
(2) underground part underbalance in drilling process may be implemented by the device, bit speed, protection oil can be improved
Gas reservoir improves yield, additionally it is possible to maintain top well section or bad ground hole stability, reduce the accidents such as well slough, blowout hair
It is raw.
(3) the nearly drill bit part underbalance in shaft bottom, low density drilling fluid impact shaft bottom after the ejection of drill bit 11, carry shaft bottom rock
Among bits return the annular space that drill bit top connection 10 is formed with the borehole wall, then by the return port 20 for the pipe nipple 2 that flows back, into continuous oil
Pipe 1 and the micro-loop that drilling rod is formed are empty, return out ground in the air from micro-loop, shorten with borehole wall contact-segment, and well control problem is also just relatively simple
Change, reduces the expense of equipment investment and the ground blowout out of control equivalent risk caused by equipment fault, ensured rig personnel
The safety of the person and property.
Under a specific usage scenario,
As shown in Figure 1, continuous pipe fitting 6 is packed into inside drill bit top connection 10.When installation, in 6 lower part of continuous pipe fitting
Upper bearing (metal) 9 is covered, groove location is sealed at an upper portion thereof and loads onto sealing ring 3, then continuous pipe fitting 6 is pressed into inside drill bit top connection 10,
Ensure that continuous pipe fitting 6 can rotate in drill bit top connection 10 simultaneously.
10 upper end mother's straight thread of drill bit top connection and reflux 2 male straight screw connection of pipe nipple, the two junction is also provided with close
Seal ring 3；10 lower end box thread of drill bit top connection (regular button) is connect with 11 male thread of drill bit.
2 upper end mother's straight thread of pipe nipple flow back directly with the male straight screw connection of drilling rod, after the completion of connection, continues drilling rod connecting
It is single, by 11 G.I.H of drill bit to shaft bottom.2 upper return port 20 of pipe nipple that flows back tilts upwards, and rock drilling well is taken convenient for external annular space
Liquid enters micro-loop sky.
1 lower end of coiled tubing is connected through a screw thread coiled tubing connector 8, and sealing ring 3 and card are loaded onto on coiled tubing connector 8
Spring 7.
Two positions semi-rings 4 are fixed on coiled tubing 1 using hexagon socket countersunk flat cap head screw 5, and positions semi-ring 4 is in coiled tubing
The top of connector 8, closely coiled tubing connector 8.
After drill bit 11 enters well to shaft bottom, by coiled tubing 1 from G.I.H inside drilling rod, until coiled tubing connector 8
It is inserted into continuous pipe fitting 6.Insertion depth is limited by positions semi-ring 4, is connected the two by clamp spring 7 after insertion, and sealing ring 3 plays
Hydraulic seal effect.
In drilling process, coiled tubing 1 does not rotate inside the device, and the torque of drill bit passes through drilling rod, reflux by drilling machine
Pipe nipple 2 and drill bit top connection 10 are transmitted.Outer drill rod, reflux pipe nipple 2, drill bit top connection 10 drive drill bit 11 to rotate kata-rocks
Stone.Internal coiled tubing 1 is circumferential static, can transmit drilling fluid with drilling longitudinal movement.
Low density drilling fluid is injected by coiled tubing 1, flows through bit nozzle, is impacted after shaft bottom, cutting carring is successively
By the annular space between drill bit runner, drill bit top connection 10 and the borehole wall, the return port 20 on reflux pipe nipple 2, coiled tubing 1 and bore
Micro-loop sky between bar returns out ground.
Using the reflux, coiled tubing 1 (1) can be entered by the return port 20 for the pipe nipple 2 that flows back by taking rock drilling fluid
The micro-loop formed with drilling rod is empty, and wall surface is that steel, frictional resistance are small, and flow area is small, is conducive to rock inside and outside the micro-loop sky
It is returned on bits, improves bit speed, reduce the generation of the down-hole accidents such as desilting bit freezing.
Using the reflux, can coordinate and realize underground part underbalance in drilling process, can improve bit speed,
It protects oil and gas reservoir, improve yield, additionally it is possible to maintain top well section or bad ground hole stability, reduce well slough, blowout etc.
Accident occurs；Local bottom pressure effectively in control drilling process, and does not interfere with wellbore stability, reduce bad ground or
The drilling failure of abnormal pressure interval occurs；It can simplify well structure design simultaneously, reduce the expense of equipment investment, and
Ground blowout out of control equivalent risk caused by equipment fault reduces drilling cost.Compared with traditional drilling mode, this method reduces
The generation of drilling failure, improves drilling speed, has effectively shortened drilling time, can play the role of protecting reservoir, reduce
Drilling cost is with a wide range of applications.
Herein cited any digital value all include between lower limiting value to upper limit value with the lower value of an incremented and
The all values of upper value, there are the intervals of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity of component or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is arrived in order to illustrate also clearly listing such as 15 to 85,22 in the specification
68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1.
These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all ranges all include all numbers between endpoint and endpoint.It is used together with range
" about " or " approximation " be suitable for two endpoints of the range.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", including at least the endpoint indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.The term " substantially by ... constitute " for describing combination should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.
Multiple element, ingredient, component or step can be provided by single integrated component, ingredient, component or step.Optionally
Ground, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation.It is used for
The open "a" or "an" for describing element, ingredient, component or step is not said to exclude other elements, ingredient, component
Or step.
Above-mentioned each embodiment in this specification is described in a progressive manner, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment stressed is and other embodiment difference.
The foregoing is merely several embodiments of the invention, although disclosed herein embodiment it is as above, institute
Content is stated only to facilitate the embodiment for understanding the present invention and using, is not intended to limit the present invention.Any institute of the present invention
Belong to those skilled in the art, do not depart from disclosed herein spirit and scope under the premise of, can be in embodiment
Formal and details on make any modification and variation, but the scope of patent protection of the present invention still must be with appended claims
Subject to the range that book is defined.
Claims (12)
1. a kind of part under balance pressure drilling reflux, which is characterized in that including：
Coiled tubing；
It is connected to the coiled tubing connector of the coiled tubing lower end；
The continuous pipe fitting being set in outside the coiled tubing connector, the continuous pipe fitting engage with the coiled tubing connector
Connection；
The drill bit top connection being set in outside the continuous pipe fitting is formed between the drill bit top connection and the continuous pipe fitting
There is annular chamber, bearing is provided in the annular chamber；
Drill bit in drill bit top connection lower end is set；It is provided with nozzle on the drill bit；
It is connected to the reflux pipe nipple of the top connection upper end；It is provided with return port on the side wall of the reflux pipe nipple；The upper end connects
It is connected to drilling rod；
The coiled tubing is to the inner flow passage for being formed with perforation between the drill bit；Drilling well liquid energy flows through the inner flow passage to described
Nozzle sprays, and carries shaft bottom landwaste and is entered by the return port in the annular space of the coiled tubing and the drilling rod.
2. under balance pressure drilling reflux in part as described in claim 1, which is characterized in that the inner flow passage is by described continuous
Oil pipe, the part coiled tubing connector, continuous pipe fitting and drill bit top connection and the drill bit are formed.
3. under balance pressure drilling reflux in part as claimed in claim 2, which is characterized in that further include clamp spring, it is described continuous
It is provided with the first holding section on oil connection outer wall, is provided on the continuous pipe fitting inner wall and sets the of the clamp spring for card
Two holding sections, the coiled tubing connector and the continuous pipe fitting are fastened by the clamp spring.
4. part under balance pressure drilling reflux as claimed in claim 3, which is characterized in that further include be fixed on it is described continuous
Locating piece outside oil pipe, it is at least one that the lower end of the locating piece can be fastened on the coiled tubing connector, continuous pipe fitting
Upper end, when the lower end of the locating piece is engaged, the clamp spring is caught in first holding section.
5. under balance pressure drilling reflux in part as claimed in claim 4, which is characterized in that the locating piece includes mutually splicing
Two positions semi-rings, the positions semi-ring is fixed by screws on the outer wall of the coiled tubing.
6. under balance pressure drilling reflux in part as claimed in claim 4, which is characterized in that the coiled tubing connector is whole
In hollow revolving body, the hollow space is through hole, and the coiled tubing connector is formed with limiting section on inner wall, described
The axial direction that limiting section is used to limit the coiled tubing moves down distance.
7. under balance pressure drilling reflux in part as claimed in claim 6, which is characterized in that outside the coiled tubing connector
It is provided with the first groove on wall, sealing ring is additionally provided in first groove.
8. part under balance pressure drilling reflux as claimed in claim 3, which is characterized in that the continuous pipe fitting is in integrally
Hollow revolving body, the hollow space are through hole, are provided with the second groove on the outer wall of the continuous pipe fitting, described the
It is additionally provided with sealing ring in two grooves.
9. part under balance pressure drilling reflux as claimed in claim 8, which is characterized in that the drill bit top connection is in integrally
Hollow revolving body, the hollow space are through hole, are formed in the drill bit top connection for against the of the bearing
One limiting section and for the second limiting section against the continuous pipe fitting lower end.
10. part under balance pressure drilling reflux as claimed in claim 9, which is characterized in that the drilling rod, reflux pipe nipple,
Drill bit top connection, drill bit are connected through a screw thread, and the rotary power of drilling machine is passed by the drilling rod, reflux pipe nipple, drill bit top connection
It is handed to the drill bit.
11. under balance pressure drilling reflux in part as described in claim 1, which is characterized in that be provided with envelope on the drilling rod
Every device, annular space of the packer for being formed between the pit shaft where insulating the drilling rod and the drilling rod, the packer
The density of drilling fluid below is less than the density of the above drilling fluid of the packer, forms local under balance pressure drilling.
12. under balance pressure drilling reflux in part as described in claim 1, which is characterized in that the drill bit top connection and institute
State drill bit integrated molding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711233685.4A CN107939318B (en) | 2017-11-30 | 2017-11-30 | Local under balance pressure drilling reflux |
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| CN201711233685.4A CN107939318B (en) | 2017-11-30 | 2017-11-30 | Local under balance pressure drilling reflux |
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| CN107939318A CN107939318A (en) | 2018-04-20 |
| CN107939318B true CN107939318B (en) | 2018-11-09 |
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| CN102022077B (en) * | 2010-11-16 | 2012-11-28 | 北京华通兴远供热节能技术有限公司 | Drilling device for underground embedded pipe orifice well of soil source heat pump system |
| MX340246B (en) * | 2011-08-11 | 2016-07-01 | Halliburton Energy Services Inc | Systems and methods for locking swivel joints when performing subterranean operations. |
| US9109417B2 (en) * | 2012-06-27 | 2015-08-18 | Odfjell Well Services Europe As | Drill string mountable wellbore cleanup apparatus and method |
| CN203594377U (en) * | 2013-12-08 | 2014-05-14 | 中国石油集团渤海钻探工程有限公司 | Coiled tubing gravity drilling tool |
| CN106703720B (en) * | 2016-12-02 | 2018-11-09 | 中国石油大学(北京) | A kind of drilling rig of steel wire drive |
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