CN106321004B - A kind of horizontal well continuous tubing drill plug tubing string - Google Patents
A kind of horizontal well continuous tubing drill plug tubing string Download PDFInfo
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- CN106321004B CN106321004B CN201510386536.6A CN201510386536A CN106321004B CN 106321004 B CN106321004 B CN 106321004B CN 201510386536 A CN201510386536 A CN 201510386536A CN 106321004 B CN106321004 B CN 106321004B
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- tubing string
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Abstract
The present invention proposes a kind of horizontal well continuous tubing drill plug tubing string, comprising: successively junk mill interconnected, motor, motor head, anchoring pressurizing device and bumper jar.Horizontal well continuous tubing drill plug tubing string according to the present invention comprising can will bore plug tubing string and be anchored on the anchoring pressurizing device in horizontal well casing pipe.Anchoring pressurizing device will bore plug tubing string be anchored in horizontal well casing pipe after, pressurize to junk mill, to guarantee the bit pressure of junk mill.Brill plug tubing string after anchoring can balance the axial force generated when junk mill is bored except bridge plug, so that junk mill drilling process is stablized, to improve the efficiency bored and remove bridge plug, shorten the time bored and remove bridge plug.
Description
Technical field
The present invention relates to unconventional oil and gas exploration and development technical fields, more particularly to a kind of horizontal well continuous tubing drill plug
Tubing string.
Background technique
The exploitation of unconventional oil and gas improves well yield mainly by horizontal well stage fracturing technology, and wherein waterpower pumps
Bridge plug perforating and fracturing integration staged fracturing technique technology has become untraditional reservoir, the especially weight of shale Reservoir Development
Means are wanted, after the completion of the technique subsection pressure break, there are bridge plugs in pit shaft, guarantee that production of hydrocarbons is unimpeded to restore pit shaft, it is necessary to
It bores milling and falls bridge plug, existing brill milling bridge plug tubular column structure mode includes oil pipe working string and continuous oil pipe operation tubing string two
Kind work pattern.
Milling bridge plug is bored using oil pipe, ground installation is workover rig, uses continuous tubing drill milling bridge plug, ground installation
It is the equipment such as coild tubing unit and matched crane.Oil pipe bores plug operation and needs lower oil tube operation, wants to working space
Ask high, consuming time is long for workover rig lower oil tube, and the operation of installation, pressure testing, dismounting and the well head installation of well-control equipment is not only
It is required that it is high and there are secondary kill-job operation, the secondary pollution of oil-gas reservoir can be brought, fracturing yield increasing effect is influenced.
The continuous lower oil tube of roller is leaned in continuous tubing drill plug operation, and the used time is short, and well control safety.Bore plug after can directly into
Row test production, is not present secondary kill-job bring pollution problem, is conducive to the effect for playing fracturing yield increasing, is conducive to protection oil
Gas reservoir.Contraction in Site of the continuous tubing drill plug operation particularly suitable for " well factory " mode, is institutional operation mode
It is best to bore plug mode.
Currently used continuous tubing drill plug tubing string are as follows: tubing string mainly by coiled tubing connector, ball-and-seat, give up, jarring
The composition such as device, motor and junk mill.With the increase of current horizontal well length, horizontal section length is increasingly longer, and coiled tubing is applied
The bit pressure being added on drilling tool also becomes difficult, and horizontal segment bottom bridge plug is caused to bore except the time is multiplied, and has seriously affected brill plug
The raising of efficiency increases the development cost of shale gas reservoir, reduces development benefit.
Summary of the invention
The technical problem to be solved by the present invention is to the bit pressures on the drilling tool in order to overcome brill plug tubing string in the prior art
It is insufficient and horizontal segment bridge plug is caused to bore the deficiency for removing overlong time.
In view of the above-mentioned problems, the invention proposes a kind of horizontal well continuous tubing drill plug tubing strings, comprising: be successively connected with each other
Junk mill, motor, motor head, anchoring pressurizing device and bumper jar.
Horizontal well continuous tubing drill plug tubing string according to the present invention comprising can will bore plug tubing string and be anchored on horizontal well set
Anchoring pressurizing device in pipe.Anchoring pressurizing device will bore plug tubing string be anchored in horizontal well casing pipe after, add to junk mill
Pressure, to guarantee the bit pressure of junk mill.Brill plug tubing string after anchoring can balance the axial force generated when junk mill is bored except bridge plug, so that mill
Shoes drilling process is stablized, to improve the efficiency bored and remove bridge plug, shortens the time bored and remove bridge plug.
In one embodiment, the anchoring pressurizing device include the anchor mechanism ontology that is connected with the bumper jar with
And it can be along the anchor fluke of the anchor mechanism ontology radial expansion.
In one embodiment, the anchor mechanism ontology includes centre bore and is connected with the centre bore and along institute
The stepped hole that anchor mechanism ontology radially extends is stated, the anchor fluke is arranged in biggish first stepped hole in aperture and the anchor fluke
Cooperation is sealed between the hole wall of first stepped hole.
In one embodiment, the anchor fluke includes pedestal and the protrusion pedestal and prolongs along the axial direction of the centre bore
The stabilizer blade stretched is provided with protrusion on the end face of the stabilizer blade.
In one embodiment, it is fixedly connected on the outer peripheral surface of the anchor mechanism main body and crosses first stepped hole
Aperture anchor fluke pressing plate, be provided with spring between the pedestal and the anchor fluke pressing plate.
In one embodiment, the anchoring pressurizing device include the pressing mechanism ontology that is connected with the motor head with
And it is set in the central tube in the centre bore of the pressing mechanism ontology, the central tube outer peripheral surface is provided with annular flange, institute
The hole wall sealing for stating the outer peripheral surface and the centre bore of annular flange cooperates.
In one embodiment, the centre bore includes the biggish second segment of the lesser first segment in aperture and aperture, institute
Annular flange is stated to be located in the second segment of the centre bore and can be along the axial movement of the second segment of the centre bore.
In one embodiment, the central tube further includes the round pipeline section that the annular flange side is arranged in, described
Round pipeline section is inserted into the first segment of the centre bore and is formed with gap between the hole wall of the first segment of the centre bore.
In one embodiment, the central tube further includes the regular prism shape pipe that the annular flange other side is arranged in
Section, the second segment of the centre bore are connected with end cap, and being provided centrally with for the end cap is matched with the regular prism shape pipeline section shape
The through-hole of conjunction.
In one embodiment, the horizontal well continuous tubing drill plug tubing string further include respectively with the anchoring pressurizing device
The oscillator being connected with bumper jar.
Anchoring pressurizing device according to the present invention bores plug tubing string and passes through the anchor of anchoring pressurizing device compared with the existing technology
Determine mechanism to be anchored in horizontal well casing pipe, so as to balance the torque that motor applies coiled tubing, extends coiled tubing
Service life.Meanwhile the pressing mechanism being anchored in pressurizing device can guarantee the bit pressure of junk mill, provide brill except bridge plug efficiency.
When tripping in is hampered brill plug tubing string in horizontal well, oscillator can eliminate the problem of brill plug tubing string tripping in is hampered, and solve brill
Fill in tubing string problem not in place under net horizontal section.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.
Fig. 1 is the overall structure diagram of the brill plug tubing string of the embodiment of the present invention.
Fig. 2 is the overall structure diagram of the anchoring pressurizing device of the embodiment of the present invention.
Fig. 3 is A-A schematic cross-sectional view in Fig. 2.
Fig. 4 is partial enlarged view at B in Fig. 3.
Fig. 5 is the first anchor fluke structural schematic diagram of the embodiment of the present invention.
Fig. 6 is second of anchor fluke structural schematic diagram of the embodiment of the present invention.
Fig. 7 is the structural schematic diagram of the central tube of the embodiment of the present invention.
In the accompanying drawings, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
As shown in Figure 1, the horizontal well continuous tubing drill plug tubing string 10 of the embodiment of the present invention, including for boring the mill for removing bridge plug
Shoes 11, the motor 12 being drivingly connected with junk mill 11, the motor head 13 being fixedly attached on motor 12 are fixedly connected with motor head 13
Anchoring pressurizing device 14, with anchoring pressurizing device 14 oscillator 15 being fixedly connected, the jarring that is fixedly connected with oscillator 15
Device 16 and the coiled tubing connector 17 being fixedly connected with bumper jar 16.Horizontal well continuous tubing drill plug tubing string 10 is lowered into level
Behind predetermined position in casing, the liquid for having pressure is inputted in plug tubing string 10 to boring.It is anchored pressurizing device 14 and enters work
State will have been bored plug tubing string 10 and has been anchored, and liquid can be rotated with drive motor 12, and then motor 12 drives the rotation of junk mill 11 to remove to bore
Bridge plug in horizontal well casing pipe.
Being anchored pressurizing device 14 includes anchor mechanism, righting mechanism and pressing mechanism.Anchor mechanism and 16 phase of bumper jar
Connection, pressing mechanism are connected with motor head 13, and righting mechanism is connected with anchor mechanism and pressing mechanism respectively.Anchoring pressurization
Device 14 can will bore plug tubing string 10 and be anchored in horizontal well casing pipe, and apply certain thrust to junk mill 11 to increase junk mill
11 bit pressure bores the efficiency for removing bridge plug so as to improve, shortens to bore and remove the time.
After horizontal well continuous tubing drill plug tubing string 10 is lowered into the predetermined position in horizontal well casing pipe, bores plug tubing string 10 and pass through
Anchor mechanism is anchored in horizontal well casing pipe, plays restriction effect to the circumferential movement and axial movement of boring plug tubing string 10, can be with
The axial force that the twisting resistance and junk mill 11 that balancing motor 12 drives junk mill 11 to generate when rotating generate when boring except bridge plug, so as to
Enough guarantee the positional stability that plug tubing string 10 is bored when junk mill 11 is bored except bridge plug.
As shown in Fig. 2, anchor mechanism includes the anchor mechanism ontology 18 being threadedly coupled with oscillator 15, is arranged in anchoring machine
Anchor fluke 19 on structure ontology 18 and the anchor fluke pressing plate 20 being fixedly connected with anchor mechanism ontology 18.As shown in Figure 3, Figure 4, it is anchored
Mechanism body 18 includes centre bore and the stepped hole for being connected with the centre bore and radially extending along anchor mechanism ontology 18.Rank
Terraced hole includes being connected towards external and biggish first stepped hole in aperture and with centre bore and lesser second ladder in aperture
Hole.Anchor fluke 19 to be placed on aperture larger and towards can stretch in the first external stepped hole and along the radial direction of anchor mechanism ontology 18
Out or retract.In the present embodiment, as shown in figure 3, the angle α of the axis of the axis and centre bore of stepped hole is 90 degree.
In the embodiment of the present invention, as shown in figure 5, anchor fluke 19 includes pedestal 191 and is connected with pedestal 191 and symmetrically
Two stabilizer blades 192 being arranged.Circumferential slot 193 is provided on the outer peripheral surface of pedestal 191.Sealing ring is installed in circumferential slot 193.Anchor
Pawl 19 when being put into the first stepped hole, the hole wall of circumferential slot 193 and the first stepped hole squeezes sealing ring to form sealing.Two
The grooving 194 of the line-styled of the axial direction extension along pedestal 191 is formed between stabilizer blade 192.Anchor mechanism further include across
The anchor fluke pressing plate 20 crossed the aperture of the first stepped hole and the aperture is divided into two.The both ends of anchor fluke pressing plate 20 pass through screw respectively
It is fixedly attached on anchor mechanism ontology 18.Anchor fluke pressing plate 20 is corresponding with the grooving 194 on anchor fluke 19.
As shown in figure 4, being provided with spring 21 between the bottom and anchor fluke pressing plate 20 of grooving 194.The pedestal 191 of anchor fluke 19 by
After power, two stabilizer blades 192 of anchor fluke 19 can stretch out from the first stepped hole and move closer to the inner wall of horizontal well casing pipe, and anchor fluke
Pressing plate 20 can enter in grooving 194, while spring 21 is compressed.Two stabilizer blades 192 stretched out are eventually pressed on horizontal well
On the inner wall of casing, so that the entire plug tubing string 10 that bores is anchored in horizontal well casing pipe.In releasing anchoring process, spring 21 is used
It retracts in the first stepped hole in promotion anchor fluke 19 with homing.
As shown in figure 5, being provided with protrusion 195 on the end face of two stabilizer blades 192 of anchor fluke 19.Stabilizer blade with protrusion 195
192 can generate bigger pressure to the inner wall of horizontal well casing pipe, can guarantee the stability for boring plug 10 anchoring states of tubing string and
Reliability.The stabilizer blade 192 of anchor fluke 19 can generate the anchorage force of axial and circumferential respectively, when so as to the rotation of balancing motor 12
The axial force that the twisting resistance and junk mill 11 of generation generate when boring except bridge plug, extend continuous tubing drill plug tubing string 10 uses the longevity
Life.In the present embodiment, as shown in Figure 5, Figure 6, it is provided on the end face of two stabilizer blades 192 of anchor fluke 19 perpendicular with grooving 194
Or parallel strip projected parts 195, the top of protrusion 195 is tip, and top is in contact with the hole wall of horizontal well casing pipe, thus
It can compress on horizontal well casing pipe inner wall.In other embodiments, protrusion 195 is it is so structured that orthopyramid shape or hemispherical.
Liquid enters in the centre bore of anchor mechanism ontology 18 and applies certain pressure to the pedestal of anchor fluke 19 191 and push
Anchor fluke 19 is mobile.After two stabilizer blades 192 of anchor fluke 19 stretch out the first stepped hole, anchor fluke pressing plate 20 enters the grooving 194, anchor fluke 19
Two stabilizer blades 192 from by anchor fluke pressing plate 20 segmentation formed two apertures stretch out the inner wall up to being pressed on horizontal well casing pipe
On.Anchor fluke pressing plate 20 jointly applies spring 21 with anchor fluke 19 for preventing anchor fluke 19 from deviating from from the first stepped hole, while also
Extruding force.
As shown in figure Fig. 3,4, righting mechanism includes the pipeline short section 22 being threadedly coupled with anchor mechanism ontology 18 and set
The centralizer 23 being located on the outer peripheral surface of pipeline short section 22.Righting mechanism bores plug 10 tripping in of tubing string in the process in level for adjusting
Position in casing, guarantee smoothly complete tripping in process.After plug tubing string 10 is bored by anchor mechanism anchoring, it is anchored pressurizing device
14 pressing mechanism applies a thrust to junk mill 11 to increase the bit pressure of junk mill 11, guarantees the cutting between junk mill 11 and bridge plug
Pressure is stablized, so that improving junk mill 11 bores the efficiency for removing bridge plug, shortens the time bored and remove bridge plug.
As shown in Figure 3, Figure 4, pressing mechanism includes the pressing mechanism sheet being threadedly coupled with the pipeline short section 22 of righting mechanism
Body 24 and the central tube 25 being arranged in pressing mechanism ontology 24.Pressing mechanism ontology 24 includes centre bore.The centre bore packet
Include the biggish second segment of the lesser first segment in aperture and aperture.As shown in fig. 7, being provided with annular flange 251 on central tube 25.Ring
Shape flange 251 is located at the second segment of the centre bore.Circumferential slot 193 is provided on the outer peripheral surface of annular flange 251.Circumferential slot 193
Sealing ring is provided between the hole wall of the second segment of centre bore.
As shown in fig. 7, central tube 25 further includes the round pipeline section 252 and positive rib for being located at 251 two sides of annular flange
Cylindricality pipeline section 253.Round pipeline section 252 is inserted into the first segment of centre bore and is formed with gap between the hole wall of first segment.Liquid
It is directly in contact into the gap with annular flange 251, so that liquid applies thrust to the end face of annular flange 251, in turn
Push central tube 25 mobile.Regular prism shape pipeline section 253 is located at the second segment of centre bore.
As shown in Figure 3, Figure 4, end cap 26 is threaded in the aperture of the second segment of centre bore.End cap 26 is provided centrally with
The through-hole matched with the outer peripheral surface of regular prism shape pipeline section 253.The circumferential slot for accommodating sealing ring is provided on the hole wall of through-hole
193.The outer peripheral surface of regular prism shape pipeline section 253 and the hole wall of through-hole squeeze sealing ring to form sealing.Regular prism shape pipeline section 253
A part stretches out the second segment of centre bore across the through-hole.
26 one side of end cap is used to cooperate with annular flange 251 to prevent central tube 25 from taking off from pressing mechanism ontology 24
Out；On the other hand, when the through-hole of regular prism shape pipeline section 253 and end cap 26 cooperates, motor 12 can be rotated into the torque generated and led to
It is overpressurized mechanism body 24, pipeline short section 22 and anchor mechanism ontology 18 to be eventually transferred on horizontal well casing pipe, the company of avoiding
Continuous oil pipe bores plug tubing string 10 to be caused to damage by torsional impact, to increase the use longevity of continuous tubing drill plug tubing string 10
Life.In the embodiment of the present invention, regular prism shape pipeline section 253 is positive eight prismatic pipeline sections.
As shown in Figure 3, Figure 4, pipe is threaded on the end of the regular prism shape pipeline section 253 of the through-hole of end cap 26 to connect
First 27.The other end of pipe fitting 27 is threadedly coupled on motor head 13.After boring plug tubing string 10 and completing anchoring, pressuring machine is entered
The liquid of the first segment of the centre bore of structure ontology 24 can apply the thrust of an axial direction to annular flange 251 to push annular flange
251 move axially in the second segment of centre bore.The axial movement of central tube 25 can drive motor head 13, motor 12 and mill
Shoes 11 move axially, so as to guarantee the steady of bit pressure that during boring except bridge plug junk mill 11 is applied on bridge plug
It is fixed, the efficiency bored and remove bridge plug is improved, avoids 11 bit pressure of junk mill insufficient and causes to bore the situation long except the time.In addition, convex annular
The distance that edge 251 moves axially in the second segment of centre bore is more than or equal to the length of a bridge plug, to guarantee not having to movement
Boring plug tubing string 10 can once bore except bridge plug.
In the embodiment of the present invention, boring plug tubing string 10 further includes being connected respectively with anchoring pressurizing device 14 and bumper jar 16
The oscillator 15 connect.When tripping in is hampered continuous tubing drill plug tubing string 10 in net horizontal section, oscillator 15 can produce concussion
Power eliminates the resistance for interfering 10 tripping in of continuous tubing drill plug tubing string, transfers so as to solve to bore plug tubing string 10 in net horizontal section
Problem not in place.
The course of work of brill plug tubing string 10 of the invention is as follows:
Step 1: it is sequentially connected junk mill 11, motor 12, motor head 13, anchoring pressurizing device 14, oscillator on the ground
15, bumper jar 16 and coiled tubing connector 17 are connected through a screw thread between each component.
Step 2: plug tubing string 10 will be bored and lubricator is connected to well head.
Step 3: it will bore at first bridge plug in plug 10 lower going-into-well of tubing string.
Step 4: starting anchoring pressurizing device 14 and motor 12 bore plug tubing string 10 and are anchored in horizontal well casing pipe, motor 12
It drives junk mill 11 to bore and removes first bridge plug.
Step 5: boring after removing first bridge plug, is recycled using flushing liquor and cleans up drilling cuttings.
Step 6: stopping motor 12, continues tripping in and bores at plug 10 to the second bridge plugs of tubing string.
Step 7: it repeats Step 4: Step 5: step 6, successively bores bridge plug unless each.
Step 8: stopping motor 12, rises and to bore plug tubing string 10.
When brill plug 10 tripping in process of tubing string is hampered, starts oscillator 15, eliminate to bore and fill in 10 tripping in resistance of tubing string, thus will
Bore plug 10 tripping in of tubing string in place.After boring except whole bridge plugs, plug tubing string 10 will be bored and risen out.It acts process brill plug tubing string 10 to be hampered
When, start bumper jar 16, eliminate brill plug tubing string 10 and play out resistance, is risen out to will smoothly bore plug tubing string 10.Tubing string 10 is filled in when boring
It is hampered serious, when bumper jar 16 cannot contact out resistance, pitching carries out hydraulic releasing, acts top and bores plug tubing string 10.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (6)
1. a kind of horizontal well continuous tubing drill plug tubing string, comprising: successively junk mill interconnected, motor, motor head, anchoring pressurization
Device and bumper jar；
The anchoring pressurizing device includes the pressing mechanism ontology being connected with the motor head and is set in the pressuring machine
Central tube in the centre bore of structure ontology, the central tube outer peripheral surface are provided with annular flange, the outer peripheral surface of the annular flange
It seals and cooperates with the hole wall of the centre bore；
The centre bore includes the biggish second segment of the lesser first segment in aperture and aperture, and the annular flange is located in described
And it can be along the axial movement of the second segment of the centre bore in the second segment in heart hole；
The central tube further includes the round pipeline section that the annular flange side is arranged in, and the circle pipeline section is inserted into described
The first segment in heart hole and gap is formed between the hole wall of the first segment of the centre bore；
The central tube further includes the regular prism shape pipeline section that the annular flange other side is arranged in, the second segment of the centre bore
It is connected with end cap, the through-hole of the end cap being provided centrally with regular prism shape pipeline section shape cooperation.
2. horizontal well continuous tubing drill plug tubing string according to claim 1, which is characterized in that the anchoring pressurizing device packet
Include the anchor mechanism ontology being connected with the bumper jar and can be along the anchor fluke of the anchor mechanism ontology radial expansion.
3. horizontal well continuous tubing drill plug tubing string according to claim 2, which is characterized in that the anchor mechanism ontology packet
It includes centre bore and is connected with the centre bore and along the stepped hole that the anchor mechanism ontology radially extends, the anchor fluke is set
It sets and seals cooperation in biggish first stepped hole in aperture and between the anchor fluke and the hole wall of first stepped hole.
4. horizontal well continuous tubing drill plug tubing string according to claim 3, which is characterized in that the anchor fluke include pedestal with
And the pedestal and the axially extending stabilizer blade along the centre bore are protruded, protrusion is provided on the end face of the stabilizer blade.
5. horizontal well continuous tubing drill plug tubing string according to claim 4, which is characterized in that the anchor mechanism main body
Be fixedly connected with the anchor fluke pressing plate for crossing the aperture of first stepped hole on outer peripheral surface, the pedestal and the anchor fluke pressing plate it
Between be provided with spring.
6. horizontal well continuous tubing drill plug tubing string according to claim 1, which is characterized in that the horizontal well coiled tubing
Boring plug tubing string further includes the oscillator being connected respectively with the anchoring pressurizing device and bumper jar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386536.6A CN106321004B (en) | 2015-06-30 | 2015-06-30 | A kind of horizontal well continuous tubing drill plug tubing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510386536.6A CN106321004B (en) | 2015-06-30 | 2015-06-30 | A kind of horizontal well continuous tubing drill plug tubing string |
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| CN106321004A CN106321004A (en) | 2017-01-11 |
| CN106321004B true CN106321004B (en) | 2019-01-01 |
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| CN201510386536.6A Active CN106321004B (en) | 2015-06-30 | 2015-06-30 | A kind of horizontal well continuous tubing drill plug tubing string |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605410B (en) * | 2017-07-17 | 2019-04-02 | 中国石油集团长城钻探工程有限公司 | A kind of tubular column structure enhancing coiled tubing drilling horizontal extension ability |
| CN109519136A (en) * | 2017-09-18 | 2019-03-26 | 中国石油化工股份有限公司 | A kind of automatic rotoblast cutting technique tubing string of coiled tubing and method |
| CN112343534A (en) * | 2019-08-07 | 2021-02-09 | 中国石油化工股份有限公司 | Drilling-out tool and drilling-out method |
| CN114109287A (en) * | 2020-08-28 | 2022-03-01 | 中国石油天然气股份有限公司 | Anchoring device for hydraulic jet drilling and hydraulic jet drilling pipe column |
| CN112412378A (en) * | 2020-12-08 | 2021-02-26 | 中国石油天然气集团有限公司 | Drilling and plugging operation method for oil pipe of compact oil long horizontal well |
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