CN111287662B - Shale stratum drilling open hole drifting method - Google Patents
Shale stratum drilling open hole drifting method Download PDFInfo
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- CN111287662B CN111287662B CN202010261880.3A CN202010261880A CN111287662B CN 111287662 B CN111287662 B CN 111287662B CN 202010261880 A CN202010261880 A CN 202010261880A CN 111287662 B CN111287662 B CN 111287662B
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Abstract
The invention relates to a shale stratum drilling open hole drifting method, which comprises the following steps: in the drilling process, if the borehole wall collapses, judging whether the borehole wall collapses in the shale stratum; and if the collapse of the well wall occurs in the shale stratum, performing well opening by using a milling cone drilling tool assembly, wherein a drill bit of the milling cone drilling tool assembly is a cone mill. The open hole drifting drilling tool has the advantages that the milling cone drilling tool combination is adopted to conduct open hole drifting aiming at the phenomenon of well wall collapse caused by the shale stratum, well collapse and drill sticking caused by a drill bit are reduced, and the problem that a new well hole is not easy to scratch is solved.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploitation, in particular to a drifting method.
Background
When the water-based drilling fluid is adopted to drill a shale well section, underground complex accidents such as instability and collapse of a well wall are easy to happen, and the drilling fluid enters a near-well-wall stratum under the driving of pressure difference, temperature difference, chemical potential difference, stratum capillary pressure and the like between the drilling fluid and stratum pore fluid to increase stratum collapse pressure and reduce stratum rock strength. For a strong water-sensitive shale formation, the formation rock is hydrated after contacting with water, so that hydration dispersion and hydration expansion are generated, and a borehole is destabilized and collapsed. For a hard and brittle shale stratum, the stratum rock has low water-sensitive mineral content and is not easy to hydrate, but the invasion of the drilling fluid filtrate can cause the transmission of hydraulic pressure to the stratum, so that the pore pressure of the stratum close to a well wall is increased, and the stratum rock is collapsed.
When drilling shale strata, on one hand, the collapse of the shale stratum needs to be prevented through a physical and chemical method, namely, the density of the drilling fluid is improved, so that the bottom hole pressure is increased to support a well wall, or the drilling fluid inhibition is improved, the hydration expansion of the shale is inhibited, the mud cake quality is improved, and the water loss is reduced, so that the contact between the filtrate of the drilling fluid and the shale is reduced; on the other hand, after a well collapse event occurs, the hanging and clamping well section is smooth and unobstructed by means of reaming and well opening, and drilling blockage accidents caused by hanging and clamping are avoided.
However, after a well collapse event occurs, due to the fact that actual conditions on site are complex and changeable, the phenomenon that a drifting drill bit is stuck is easy to occur, or a new well hole is marked, well wall collapse accidents cannot be effectively solved, and great troubles are caused to later construction.
Disclosure of Invention
The present application is made based on the recognition and study of the following problems by the inventors:
the three-fold series leek garden group and the phoenix tree ditch group in the Quadrature Gssangregion Gssajou recess in Xinjiang show gray mudstones, dark mudstones and powder sandstones integrally, and the geological prompt belongs to the well section which is easy to collapse. The horizontal well in the Jimusala shale oil area is generally a side drilling horizontal well, a 215.9mm drill bit is used for drilling through a reed grass ditch group for secondary mining, ash injection is backfilled to a leek garden group, a side drill with a three-opening ash removal plug is used for side drilling, deflecting is carried out to enter a horizontal section, the ash injection is backfilled without returning into a technical sleeve, so that a bare leakage stratum with the thickness of 1-3m is formed in the sleeve of the two-opening technical sleeve, and the well wall is extremely unstable and easy to collapse due to the fact that the sleeve of the two-opening technical sleeve is immersed by drilling fluid in a well for a. According to 2018 Jimusala shale oil complex well statistics, the well collapse and the sticking phenomenon of multiple wells occur from the lower part of a leek garden group to the upper part of a phoenix tree ditch group.
Aiming at the collapse of the well wall of the deflecting section of the side-drilling horizontal well in the oil stratum of the Gimbal shale, on one hand, the performance of drilling fluid needs to be adjusted, the stratum bearing capacity of the collapsing well section is improved, the well wall is stabilized, on the other hand, the drilling and drifting mode is adopted to ensure that the well hanging and blocking section is smooth and unobstructed, and the drilling and blocking accident caused by hanging and blocking is avoided.
However, through research, the inventor finds that the following problems often occur in the well dredging process due to the fact that a well section of the Jimussay shale oil sidetracking horizontal well is unstable in a well wall is in a deflecting section and a stratum is soaked by drilling fluid for a long time: (1) in a well section with a collapsed well wall, the risk of drilling blockage caused by the drifting of a drill bit is high; (2) due to the low weight-on-bit (20-30KN) limit of the conventional drilling tool combination drifting, the problem that the hole cannot be scratched down frequently occurs; (3) in the drifting process, due to the aggressiveness of the drill bit and the rigidity of the drilling tool, a new borehole is easy to cut after the conventional drilling tool assembly enters the deflecting section.
Therefore, a drifting method for dealing with the well wall collapse of the deflecting section of the shale formation sidetracking horizontal well is needed.
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a drifting method, aiming at the phenomenon of well wall collapse caused by a shale stratum, the well is drifted by adopting the milling cone drilling tool combination, so that the well collapse and drill jamming caused by a drill bit are reduced, and the problem of marking out a new well hole is not easy to occur.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides a well dredging method, which comprises the following steps: in the drilling process, if the borehole wall collapses, judging whether the borehole wall collapses in the shale stratum; and if the collapse of the well wall occurs in the shale stratum, performing well opening by using a milling cone drilling tool assembly, wherein a drill bit of the milling cone drilling tool assembly is a cone mill.
According to the drifting method provided by the embodiment of the invention, when the borehole wall collapse phenomenon occurs in the shale stratum, the drifting is carried out by adopting the milling cone drilling tool assembly, the conical milling shoes can enter the collapsed borehole section more easily, the drifting effect is achieved, the larger borehole wall falling blocks can be ground into small blocks, the drilling clamping accident caused by the large falling blocks in the drifting process is effectively avoided, and the upward return of rock debris during the well collapse treatment by circulating well washing is facilitated. In addition, the milling cone drilling tool combination can improve the drilling pressure in the drifting process but is not easy to mark a new borehole, the success rate of the hole-cutting drifting is greatly improved, the borehole wall collapse accident is effectively solved, and convenience is brought to later construction.
Optionally, when the borehole wall collapse occurs in the shale formation, further judging whether the borehole wall collapse is the borehole wall collapse of the deflecting section of the sidetracking horizontal well, so that when the borehole wall collapse is judged to be the borehole wall collapse of the deflecting section of the sidetracking horizontal well, the borehole is opened by adopting the milling cone drilling tool combination according to the borehole condition.
Optionally, the drifting with the milling cone drilling assembly comprises: and (4) drifting is carried out in a two-trip drifting mode by adopting a milling cone drilling tool assembly.
The first drifting adopts a milling cone single-support drilling tool combination, and the second drifting adopts a milling cone double-support drilling tool combination.
Further, if the drilling tool combination of the second drifting is difficult to drill and dredge, the drifting is continued in a two-trip drifting mode until the drilling tool combination of the second drifting is drilled smoothly without resistance in the two-trip drifting mode. Optionally, the milling cone drilling assembly comprises a milling cone, a centralizer and a drill rod.
Specifically, the milling cone single-leg drilling tool assembly comprises a milling cone, a double female joint, a 212mm centralizer, a weighted drill rod 2 column, a drill rod 60 column, a weighted drill rod 18 column and a drill rod which are sequentially connected; the milling-cone double-centralizer assembly comprises a milling cone, a double female joint, a 212mm centralizer, 1 weighted drill rod, a 212mm centralizer, 5 weighted drill rods, 60 drill rods, 18 weighted drill rods and drill rods which are sequentially connected. The weighted drill rod 18 columns in the milling cone double-support drilling tool combination provide necessary bit pressure for the drilling tool combination, so that new well holes are not easy to mark in the process of increasing the bit pressure in the drifting process, and the success rate of hole marking and drifting is greatly increased.
Optionally, the drifting is further performed with a roller cone triple-leg assembly after the drifting is performed with the milling cone assembly in two trips. The drifting drilling tool combination can further repair irregular well walls, verify the difficulty in casing running caused by casing rigidity in the subsequent casing running process, and ensure the subsequent casing running operation.
Specifically, the tri-lateral roller cone drilling tool assembly comprises a roller cone drill bit, a double female joint, a centralizer, a weighted drill rod, a weighted drill rod and a drill rod which are sequentially connected.
Optionally, in the process of drifting by adopting the milling cone drilling assembly, the bit weight is 20-40 KN.
Further, in the process of drifting by adopting the milling cone drilling tool assembly, the bit pressure is 30-40 KN.
(III) advantageous effects
The invention has the beneficial effects that: according to the drifting method, due to the fact that the milling cone drilling tool combination is adopted, drifting is conducted on the well wall collapse of the deflecting section of the shale stratum sidetracking horizontal well, compared with the prior art, the conical milling shoes can enter the well collapsing section more easily, the effect of drifting is achieved, the conical milling shoes can grind larger well wall falling blocks into small blocks, drilling accidents caused by large falling blocks in the well dredging process are effectively avoided, and upward returning of rock debris when the well is collapsed through circular well washing is facilitated; the milling cone drilling tool combination can improve the bit pressure to 30-40KN in the drifting process, so that a new well hole is not easy to scratch, and the success rate of reaming the well is greatly improved.
Drawings
The invention is described with the aid of the following figures:
FIG. 1 is a flow chart of a method of drifting in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a milling cone single leg assembly according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a milling cone dual centralizer assembly according to one embodiment of the invention.
[ description of reference ]
10: a wellbore;
11: milling a cone;
12: a double female joint;
13: a 212mm centralizer;
14: weighting a drill rod 2 column;
15: a 211mm centralizer;
16: 5 weighted drill rods are arranged;
17: a drill stem 60 string;
18: a weighted drill pipe 18 string;
19: 1 drill rod is weighted.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Aiming at the well wall collapse generated in the shale stratum, the well dredging method provided by the embodiment of the invention adopts the milling cone drilling tool combination to conduct well dredging, and the drill bit of the milling cone drilling tool combination is a cone milling shoe, so that the well collapse and drill jamming caused by the drill bit are effectively reduced, the problem of marking out a new well hole is not easy to occur, and the well dredging success rate is greatly improved.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The drifting method according to the embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the drifting method provided by the embodiment of the present invention includes the following steps:
s1, in the drilling process, if the borehole wall is collapsed, judging whether the borehole wall is collapsed in the shale stratum.
And S2, if the well wall collapse occurs in the shale stratum, performing well drifting by using the milling cone drilling tool assembly, wherein the drill bit of the milling cone drilling tool assembly is a cone mill.
Optionally, in an embodiment of the present invention, when the borehole wall collapse occurs in the shale formation, it is further determined whether the borehole wall collapse is a borehole wall collapse of an deflecting section of the sidetracking horizontal well, so that when the borehole wall collapse is determined to be a borehole wall collapse of a deflecting section of the sidetracking horizontal well, the borehole is opened by using the milling cone drilling tool assembly according to the borehole condition.
That is to say, in the drilling process, if the borehole wall collapse occurs, whether the borehole wall collapse occurs after the shale formation is further judged, whether the borehole wall collapse is the borehole wall collapse of the deflecting section of the side-drilling horizontal well is further judged, and when the borehole wall collapse occurs in the shale formation and is judged to be the borehole wall collapse of the deflecting section of the side-drilling horizontal well, the milling cone drilling tool combination is adopted for well communication, so that the conical milling shoe can more easily enter the collapsed well section and has the well communication effect, the conical milling shoe can grind larger borehole wall dropping blocks into small blocks, the drilling blockage accident caused by large dropping blocks in the well communication process is effectively avoided, and the drilling mud upward returning is facilitated when the well collapse is processed by circular well washing.
Further, in one embodiment of the present invention, drifting with a milling cone drill assembly comprises: and (4) drifting is carried out in a two-trip drifting mode by adopting a milling cone drilling tool assembly.
The first drifting adopts a milling cone single-support drilling tool combination, and the second drifting adopts a milling cone double-support drilling tool combination. The milling cone single-support drilling tool combination adopted by the first drifting is low in rigidity, so that a new well hole is not easy to mark, the drilling tool is favorable for being marked into the well bottom, and collapsed blocks are washed out of the well; the milling cone double-support drilling tool combination adopted by the second drift well has stronger rigidity than single support due to the existence of double supports, and can play a role in repairing irregular well walls and simulate the rigidity of casing pipe columns in later-stage casing running operation.
Further, in one embodiment of the invention, if the second drifting drilling tool combination is difficult to drill and drift, the drifting is continued in a two-trip drifting mode until the second drifting drilling tool combination is drilled smoothly and unimpededly in the two-trip drifting mode.
In an embodiment of the invention, a milling cone drilling assembly comprises a milling cone, a centralizer and a drill rod.
Wherein, the use of the milling cone drilling tool combination drifting has the following advantages:
(1) due to the characteristics of the milling cone, a larger well wall falling block can be ground into a small block, so that the drilling tool jamming accident caused by the large falling block in the well dredging process is effectively avoided, and the upward return of rock debris during the well washing treatment well collapse is facilitated;
(2) the bit pressure can be properly increased in the drifting process, for example, the bit pressure can reach 30-40KN, and the situation that a new well hole is not easy to mark is difficult to occur;
(3) because the milling cone has the shape characteristics of the roller bit, the milling cone can enter a well collapse section more easily, and the well dredging effect is well achieved.
Optionally, as an embodiment, as shown in fig. 2, the milling cone single centralizer assembly comprises a milling cone, a double female joint, a 212mm centralizer, a weighted drill rod 2 column, a drill rod 60 column, a weighted drill rod 18 column and a drill rod which are connected in sequence. As shown in FIG. 3, the milling-cone double-centralizer assembly comprises a milling cone, a double female joint, a 212mm centralizer, 1 weighted drill pipe, a 211mm centralizer, 5 weighted drill pipes, 60 drill pipes, 18 weighted drill pipes and drill pipes which are connected in sequence.
Specifically, in one embodiment of the invention, the cut is also completed using the roller cone triple hole assembly after the cut is completed using the milling cone assembly in two passes. The tri-centralizer comprises a tri-cone rotary drill bit, a double female joint, a centralizer, a weighted drill rod, a weighted drill rod and a drill rod which are sequentially connected.
In the embodiment of the invention, the bit pressure can be properly increased in the process of drifting by adopting the milling cone drilling tool assembly, and the bit pressure can reach 20-40 KN. Specifically, the weight on bit can be 30-40 KN.
According to the drifting method provided by the embodiment of the invention, when the borehole wall collapse phenomenon occurs in the shale stratum, the drilling is performed by adopting the milling cone drilling tool assembly, the conical milling shoes can enter the collapsed borehole section more easily, the effect of drifting is achieved, the larger borehole wall dropping blocks can be ground into small blocks, the drilling clamping accident caused by the large dropping blocks in the drifting process is effectively avoided, and the circular well washing treatment is facilitated for upward return of rock debris during the well collapse. In addition, the milling cone drilling tool combination can improve the drilling pressure in the drifting process but is not easy to mark a new borehole, the success rate of the hole-cutting drifting is greatly improved, the borehole wall collapse accident is effectively solved, and convenience is brought to later construction.
Example 1
First, basic overview:
j10021_ H well, design well depth 4939.51m, actual well depth 4937m, and open cut section 215.9mm bit +139.7mm pay casing. Three openings were opened at 4/2/8: 00 in 2019, and the well was completed at 14:30 in 9/2 in 2019.
And (4) after completing drilling in 8, 5 and 8 months in 2019, carrying out drifting in a two-trip drifting mode. The first drifting adopts a roller cone single-hand drill tool combination, the roller cone single-hand drill tool combination comprises a roller cone drill bit, a double female joint, a 212mm centralizer, a 2-column weighting drill rod, a 60-column drill rod, a 18-column weighting drill rod and a drill rod which are sequentially connected, the drifting is drilled to 3840m and is stuck and hung, the drilling is blocked for 2 times in the reaming process, and the drifting is continued to 4300m and is stuck again after the blockage is released. And a cone double-centralizer assembly is adopted in the second drifting, the cone double-centralizer assembly comprises a cone drill bit, a double female joint, a 212mm centralizer, 1 heavy drill rod, 211mm centralizer, 5 heavy drill rods, 60 drill rods, 18 heavy drill rods and drill rods which are sequentially connected, and slight hanging blockage occurs at 3220m, 3840m and 4300m well sections. And then, a cone three-leg drilling tool combination is adopted for drifting, the cone three-leg drilling tool combination comprises cone drill bits, double female joints, 212mm centralizers, 1 weighted drill rod, 211mm centralizers, 1 weighted drill rod, 212mm centralizers, 4 weighted drill rods, 60 drill rods, 18 weighted drill rods and drill rods which are sequentially connected, slight hanging and clamping resistance occurs at well sections 3170 and 3220m, 3840m and 4300m, wherein the well section 3170 and 3220m are deflecting sections of a side-drilling horizontal well.
After the drill rod is electrically tested in a transmission mode, the roller cone double-support drilling tool combination is adopted to go into the well and drill down until the distance is 3170m, and the drilling tool is seriously stuck when the hole is scratched until the distance is 3220m, so that the drilling tool is stuck. And after the blockage is released, the drilling tool is lifted out, the cone single-support drilling tool combination is changed into a drifting, the serious blockage of the blockage drilling tool occurs again in the well section 3170 and 3220m, the well wall collapses, slurry is circularly processed, and the well wall is repaired by small-amplitude reaming.
Therefore, aiming at the well wall of the deflecting section of the horizontal well sidetracked in the oil stratum of the Giemsalar shale, the roller bit assembly is adopted for drifting after drilling, and the phenomenon of hanging and clamping when meeting resistance is easily generated in the drifting process; after the drill pipe is electrically tested in a transmission mode, the roller bit drilling tool combination is adopted for drifting, the drilling tool is severely stuck when being stuck, and the well wall collapses.
Secondly, implementation conditions are as follows:
and 8, in 2019, in 25 months, performing drifting by adopting a milling cone drilling tool combination in a two-trip drifting mode, wherein the first trip of drifting adopts a milling cone single-holding drilling tool combination as shown in fig. 2, the milling cone single-holding drilling tool combination comprises a milling cone, a double female joint, a 212mm centralizer, a weighted drilling rod 2 column, a drilling rod 60 column, a weighted drilling rod 18 column and a drilling rod which are sequentially connected, and the drilling sticking phenomenon does not occur. The second drifting adopts a milling cone double-centralizer combination as shown in fig. 3, the milling cone double-centralizer combination comprises a milling cone, a double female joint, a 212mm centralizer, 1 weighting drill rod, a 211mm centralizer, 5 weighting drill rods, 60 drill rods, 18 weighting drill rods and drill rods which are sequentially connected, and the drilling sticking phenomenon does not occur. And then, a cone three-leg drilling tool combination is adopted for drifting, the cone three-leg drilling tool combination comprises cone bits, double female connectors, 212mm centralizers, 1 weighted drill rod, 211mm centralizers, 1 weighted drill rod, 212mm centralizers, 4 weighted drill rods, 60 drill rods, 18 weighted drill rods and drill rods which are sequentially connected, the drilling tool combination is smoothly put into the well bottom, and the smooth completion of later casing running operation is guaranteed.
Therefore, aiming at the collapse of the well wall of the deflecting section of the Ji-Sa shale oil stratum sidetracking horizontal well, the milling cone drilling tool combination is adopted for drifting, the well can be smoothly put into the well bottom, the problem that the well collapses and is stuck due to the drill bit is avoided, the new well hole is not easy to scratch is solved, and the smooth completion of the later casing operation is ensured.
In conclusion, too high drilling pressure is not suitable for the drifting and hole-cutting operation of the well wall collapse well section, otherwise, a new well hole is easily generated, so that the difficulty of complex treatment work in the later period is increased; the drilling tool combination of the milling cone and the centralizer is adopted for drifting due to the structural characteristics of the milling cone, so that the drilling tool jamming caused by the collapse of the well drill bit is avoided to a great extent; the well dredging technical measures of milling cone plus single support, milling cone plus double support and gear wheel plus triple support are adopted to effectively solve the problem that the conventional well dredging drilling tool combination cannot reach the bottom smoothly, and a good application effect is obtained on site.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.
Claims (8)
1. The shale formation drilling open hole drifting method is characterized by comprising the following steps:
in the drilling process, if the borehole wall collapses, judging whether the borehole wall collapses in the shale stratum; if the well wall collapse occurs in the shale stratum, a milling cone drilling tool combination is adopted for drifting, wherein a drill bit of the milling cone drilling tool combination is a conical milling shoe;
when the well wall collapse occurs in the shale stratum, further judging whether the well wall collapse is the well wall collapse of the deflecting section of the sidetracking horizontal well, so that when the well wall collapse is judged to be the well wall collapse of the deflecting section of the sidetracking horizontal well, the well is communicated by adopting the milling cone drilling tool combination according to the well hole condition;
carrying out drifting by adopting a milling cone drilling tool combination in a two-trip drifting mode; the first drifting adopts a milling cone single-support drilling tool combination, and the second drifting adopts a milling cone double-support drilling tool combination.
2. The method of claim 1, wherein if it is difficult to trip the second trip of the drill tool assembly, continuing to trip the well in the two trips until the second trip of the drill tool assembly trips the well in the two trips.
3. The method of claim 1, wherein the milling cone drilling assembly comprises a milling cone, a centralizer, and a drill rod.
4. The method of claim 3, wherein the milling cone single leg assembly comprises a milling cone, a double box, a 212mm centralizer, a weighted drill pipe 2 string, a drill pipe 60 string, a weighted drill pipe 18 string, and a drill pipe connected in series;
the milling-cone double-centralizer assembly comprises a milling cone, a double female joint, a 212mm centralizer, 1 weighted drill rod, a 211mm centralizer, 5 weighted drill rods, 60 drill rods, 18 weighted drill rods and drill rods which are sequentially connected.
5. The method of claim 1, wherein the drifting is further performed with a roller cone triple hole assembly after the drifting is performed with the milling cone assembly in two trips.
6. The method of claim 5, wherein the roller cone triple action drilling assembly comprises a roller cone drill bit, a dual box joint, a centralizer, a weighted drill pipe, a weighted drill pipe, and a drill pipe connected in series.
7. The method according to claim 1, wherein the weight-on-bit is 20-40 KN during drifting with the milling cone drilling assembly.
8. The method according to claim 1, wherein the weight-on-bit is 30-40KN during drifting with the milling cone drilling assembly.
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| CN101555775B (en) * | 2009-04-24 | 2013-01-30 | 东营北方石油装备有限公司 | Pilot milling cone tool for repairing casing and method thereof |
| CN201474641U (en) * | 2009-05-12 | 2010-05-19 | 崔朝轩 | Set of eccentric wash over pipe, milling shoe, mill pyramid and milling rod workover tools |
| CN202659146U (en) * | 2012-06-12 | 2013-01-09 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Double-drilling combined drill structure suitable for drilling operation of oil well and horizontal well |
| CN103670317A (en) * | 2013-12-06 | 2014-03-26 | 中国石油集团长城钻探工程有限公司 | Simulation pipe string rigidity pigging method |
| CN204163632U (en) * | 2014-10-09 | 2015-02-18 | 中国石油化工集团公司 | A kind of guiding drifting instrument |
| CN204738777U (en) * | 2015-05-19 | 2015-11-04 | 胜利油田康贝石油工程装备有限公司 | System for it removes obstacles and handles and secondary well completion in an organic whole to collect pit shaft |
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