CN113513265A - Rigid-flexible deformation anti-deviation quick drilling tool combination - Google Patents
Rigid-flexible deformation anti-deviation quick drilling tool combination Download PDFInfo
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- CN113513265A CN113513265A CN202010278771.2A CN202010278771A CN113513265A CN 113513265 A CN113513265 A CN 113513265A CN 202010278771 A CN202010278771 A CN 202010278771A CN 113513265 A CN113513265 A CN 113513265A
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- 238000005553 drilling Methods 0.000 title claims abstract description 182
- 230000002265 prevention Effects 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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Classifications
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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
- E21B7/04—Directional drilling
- E21B7/10—Correction of deflected boreholes
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/16—Drill collars
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
Abstract
The invention provides a rigid-flexible deformation anti-deviation quick drilling tool assembly which comprises a drill bit, a flexible drilling tool, a centralizer and a heavy drill collar which are sequentially connected from bottom to top. The rigid-flexible deformation inclination-prevention quick drilling tool combination has a simple structure, is economic and effective, and can achieve the double purposes of increasing the drilling pressure, improving the mechanical drilling speed and effectively controlling well inclination to ensure the quality of a well hole.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling engineering, in particular to a rigid-flexible deformation anti-deviation quick drilling tool assembly.
Background
The high and steep construction zone has strong natural deflecting capability due to large formation inclination angle, and the well is easy to incline, thereby seriously influencing the well quality and the well drilling aging. For high and steep stratum, the automatic vertical drilling tool has good adaptability, but the tool is expensive to use on site due to complex structure and high manufacturing cost; in addition, as well depths increase, borehole sizes decrease, downhole temperature and pressure increase, and the applicability of vertical drilling tools is limited in slim holes and under high temperature and pressure conditions. The principle of the deflection-preventing and deflection-correcting operation of the conventional pendulum drilling tool on site is that the pendulum drilling tool assembly generates an acting force for reducing well deflection at a drill bit, the well deflection is continuously reduced by utilizing the deflection force, but the deformation of the drilling tool assembly can enable the drill bit to generate a drill bit corner for increasing the well deflection, and the larger the bit pressure is, the larger the corner is, the smaller the bit pressure can be applied by the pendulum drilling tool to carry out light-pressure hoisting, so that the drilling speed is seriously influenced. Practice shows that the influence of the drill bit corner on well deviation is large, so that an economical and effective anti-deviation quick-drilling combination is explored, the drill bit corner in the well deviation descending direction is formed when the drill bit combination deforms under the condition of large drilling pressure, and the method has important significance for achieving efficient anti-deviation, deviation correcting and quick-drilling operation targets.
The invention with the publication number of CN101260783 discloses a pre-bending dynamic anti-slant drilling method, which is characterized in that a drilling tool assembly with a pre-bending structure is adopted, and the drilling tool assembly is guided in an ordered whirling mode by utilizing the pre-arranged deformation of the drilling tool assembly in a ground driving mode, so that the dynamic lateral force on a drill bit has the characteristic of reducing the slant force which is far greater than that of the conventional pendulum drilling tool assembly, the drill bit inclination increasing corner of the conventional pendulum drilling tool assembly is eliminated, and the anti-slant drilling purpose is realized. The invention patent avoids the adverse effect of the drill bit rotation angle on the well deviation control, but does not fully utilize the beneficial effect of the drill bit rotation angle on the well deviation control.
The invention with the publication number of CN106703695A discloses a large-drilling-pressure deviation-prevention deviation-correction drilling tool assembly, wherein a drill bit, a lower coarse drilling tool, a lower fine drill collar, a centralizer, an upper fine drill collar and an upper coarse drill collar are sequentially connected, and the deviation-prevention drilling tool assembly structure is used for applying large pendulum force to the drill bit and promoting a positive cutting surface of the drill bit to turn to the deviation-reducing direction so as to realize deviation-prevention and quick drilling. However, the drilling tool assembly is complicated in deformation due to the addition of the upper fine drill collar and the lower fine drill collar in the drilling tool assembly, so that the rotation angle of the drill bit is difficult to control, and the well deviation control effect is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an anti-deviation quick-drilling tool assembly which is simple in structure, economical and effective. And along with the increase of the drilling pressure, the deflection angle of the drill bit is gradually increased after the drilling tool assembly deforms, the inclination prevention effect of the drilling tool assembly is also gradually enhanced, and the dual purposes of improving the mechanical drilling speed and effectively controlling the well inclination to ensure the well quality are achieved while the drilling pressure is increased.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a rigid-flexible deformation anti-deviation quick drilling tool combination comprises a drill bit, a flexible drilling tool, a centralizer and a heavy drill collar which are sequentially connected from bottom to top.
According to the rigid-flexible deformation anti-deviation quick drilling tool combination, under the condition of a certain well inclination angle, the upper heavy drill collar enables the section of drill collar to lie on the lower well wall under the action of gravity, the centralizer between the heavy drill collar and the flexible drilling tool plays a role of fulcrum, the self-gravity of the flexible drilling tool between the drill bit and the centralizer is small, the lower bow deformation is generated by overcoming the self-gravity under the combined action of the upper heavy drill collar and the centralizer, under the action of further applying axial drilling pressure, the lower bow of the flexible drilling tool deforms more, the deformation of the flexible drilling tool drives the drill bit to generate a drill bit corner pointing to the well descending inclined direction, under the condition of rotary rock breaking drilling of the drill bit, the drilling tool assembly drills towards the axial direction of the drill bit, so that the inclination angle of the borehole is continuously reduced, thereby play the effect of preventing inclining and rectifying, the increase of weight of simultaneously brill makes the drill bit corner bigger, and the more strong that falls to the ability that corresponds, drilling tool assembly can play and prevent inclining and beat fast dual target. Compared with the prior art, the drilling tool assembly is simpler in structure, easy to produce and maintain for use, low in manufacturing cost and production cost, stable in performance and free of risks in other aspects of drilling operation in the using process.
With respect to the above technical solution, further improvements as described below can be made.
In a preferred embodiment of the rigid-flexible anti-slant drilling tool assembly according to the present invention, the flexible drilling tool has a length of 5-8 m.
The length of the flexible drilling tool between the drill bit and the centralizer has obvious influence on the rotation angle of the drill bit after the drilling tool is stressed and deformed, the rotation angle of the drill bit is increased and then reduced along with the increase of the length of the flexible drilling tool, the optimal length exists in the range of 5-8m, so that the rotation angle of the drill bit reaches the maximum value, and the anti-inclination effect of the drilling tool assembly is optimal.
Further, in a preferred embodiment, the length of the flexible drill is 6-8 m.
The length of the drilling tool in the range of 6-8m can ensure that the anti-inclination effect of the drilling tool assembly is optimal as much as possible on the basis of fully considering the specific structure of the flexible drilling tool, such as the case of adopting a small-size screw drilling tool.
Specifically, in a preferred embodiment, the flexible drill is a small-sized screw drill.
The flexible drilling tool with the structure can increase the rotation speed of the drill bit, improve the descending rate of the well hole on one hand, and improve the mechanical drilling rate on the other hand.
Specifically, in another preferred embodiment, the flexible drilling tool employs a fine drill collar.
The flexible drilling tool adopting the fine drill collar structure is not easy to break under the action of the drilling pressure due to the large wall thickness and rigidity, so that the effect of preventing well deviation can be increased as much as possible while ensuring the necessary deformation of the flexible drilling tool and the necessary strength under the compression condition.
Specifically, in a preferred embodiment, the outer diameter of the flexible drilling device is no less than the outer diameter of the smallest drill collar in the field borehole.
The flexible drilling tool with the structure can effectively ensure the strength of the flexible drilling tool.
Specifically, in a preferred embodiment, the drilling modes of the flexible drilling tool are a rotary table drilling mode, a top drive drilling mode and a composite drilling mode.
The drilling modes in various forms are favorable for the drilling tool assembly to be suitable for complex strata such as soft and hard staggered formations, large inclination angles and the like, and the drilling tool assembly has a good effect.
Specifically, in a preferred embodiment, the centralizer is an undersized centralizer, the outer diameter of the centralizer being smaller than the outer diameter of the drill bit.
The flexible drilling tool with the structure is convenient to form interference fit with the drill bit to ensure the structural strength of the whole drilling tool assembly, and can play a good supporting role in the drilling process of the drilling tool assembly, so that the flexible drilling tool overcomes the self gravity to generate lower bow deformation.
In particular, in a preferred embodiment, the centralizer is a conventional centralizer for drilling a well.
The drilling tool combination adopting the common conventional drilling tool combination is easy to produce, maintain and use, has low manufacturing cost and use cost compared with the existing drilling tool, has stable performance, and can not bring other risks to drilling operation in the use process.
In particular, in a preferred embodiment, the drill bit is a roller cone bit or a PDC bit.
By the same principle, the drilling tool combination adopting the common conventional drilling tool combination is easy to produce, maintain and use, the manufacturing cost and the use cost are lower than those of the existing drilling tool, the performance is stable, and risks in other aspects cannot be brought to drilling operation in the use process.
Compared with the prior art, the invention has the advantages that:
(1) the anti-deviation quick drilling tool assembly provided by the invention is simple in structure, is formed by only combining common conventional drilling tools, is easy to produce, maintain and use, has low manufacturing cost and use cost compared with the existing drilling tools, is stable in performance, and does not bring risks in other aspects to drilling operation in the use process;
(2) according to the invention, the stressed deformation of the drilling tool assembly is utilized to control the rotation angle of the drill bit to turn from the well-increasing inclination direction to the well-descending inclination direction, the unfavorable condition of well inclination control is changed into a favorable condition, the inclination prevention effect of the drilling tool assembly can be improved under the condition of large drilling pressure, and the dual effects of drilling speed acceleration and well bore quality improvement are realized;
(3) the lower flexible drilling tool can adopt a small-size screw drilling tool to increase the rotating speed of a drill bit and improve the mechanical drilling speed level;
(4) the underground drilling tool assembly can be matched with any drill bit and has good effect on soft and hard staggered and large-dip-angle strata.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates the overall construction of a drilling assembly according to an embodiment of the present invention;
FIG. 2 schematically illustrates a deformed condition of a drilling assembly in an inclined borehole according to an embodiment of the present invention;
FIG. 3 is a schematic representation of the variation of the drill bit rotation angle with the length of the flexible drill according to an embodiment of the present invention;
FIG. 4 schematically illustrates the variation of bit angle with weight on bit for an embodiment of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
Fig. 1 schematically shows the overall structure of a drilling assembly 10 according to an embodiment of the present invention. Fig. 2 schematically illustrates a deformed state of the drilling assembly 10 in an inclined borehole according to an embodiment of the present invention. Fig. 3 schematically shows the variation of the angle of rotation of the drill bit 1 with the length of the flexible drilling tool 2 according to an embodiment of the invention. Fig. 4 schematically shows the variation of the rotation angle of the drill bit 1 with the weight on bit according to an embodiment of the present invention.
As shown in fig. 1 and fig. 2, a rigid-flexible deformation deviation-prevention quick drilling assembly 10 according to an embodiment of the present invention includes a drill bit 1, a flexible drilling tool 2, a centralizer 3, and a heavy drill collar 4 having an outer diameter in a range of Φ 178mm to Φ 192mm, which are sequentially connected from bottom to top.
According to the rigid-flexible deformation deviation-prevention quick drilling tool assembly disclosed by the embodiment of the invention, under the condition of a certain well deviation angle, the upper heavy drill collar enables the section of the drill collar to lie on the lower well wall under the action of gravity, the centralizer between the heavy drill collar and the flexible drilling tool plays a role of fulcrum, the flexible drilling tool between the drill bit and the centralizer has small self-gravity, and overcomes the self-gravity to generate lower bow deformation under the combined action of the upper heavy drill collar and the centralizer, the lower bow deformation of the flexible drilling tool is larger under the action of further applying axial drilling pressure, the deformation of the flexible drilling tool drives the drill bit to generate a drill bit corner pointing to the direction of descending well deviation, under the condition of rotary rock breaking drilling of the drill bit, the drilling tool assembly drills towards the axial direction of the drill bit to enable the well deviation angle of a well to be continuously reduced, so that the deviation-prevention and correction effects are achieved, meanwhile, the drill bit corner is larger under the action of increasing of the drilling pressure, the corresponding deviation-reduction capability is stronger, and the drilling tool assembly can achieve double goals of deviation prevention and quick drilling, as shown in fig. 3 and 4. Compared with the prior art, the drilling tool assembly is simpler in structure, easy to produce and maintain for use, low in manufacturing cost and production cost, stable in performance and free of risks in other aspects of drilling operation in the using process.
In the rigid-flexible deformation anti-deviation quick drilling assembly 10 of the embodiment of the invention, the length of the flexible drilling tool 2 is preferably 5-8m, and particularly preferably 6-8 m. The length of the flexible drilling tool between the drill bit and the centralizer has obvious influence on the rotation angle of the drill bit after the drilling tool is stressed and deformed, the rotation angle of the drill bit is increased and then reduced along with the increase of the length of the flexible drilling tool, the optimal length exists in the range of 5-8m, so that the rotation angle of the drill bit reaches the maximum value, and the anti-inclination effect of the drilling tool assembly is optimal. The length of the drilling tool in the range of 6-8m can ensure that the anti-inclination effect of the drilling tool assembly is optimal as much as possible on the basis of fully considering the specific structure of the flexible drilling tool, such as the case of adopting a small-size screw drilling tool.
Specifically, in the present embodiment, the flexible drill 2 employs a small-sized screw drill having an outer diameter in the range of Φ 127mm to Φ 165 mm. The flexible drilling tool with the structure can increase the rotation speed of the drill bit, improve the descending rate of the well hole on one hand, and improve the mechanical drilling rate on the other hand. Specifically, in another preferred embodiment, the flexible drilling tool 2 employs fine drill collars having an outer diameter in the range of Φ 127mm- Φ 165 mm. The flexible drilling tool adopting the fine drill collar structure is not easy to break under the action of the drilling pressure due to the large wall thickness and rigidity, so that the effect of preventing well deviation can be increased as much as possible while ensuring the necessary deformation of the flexible drilling tool and the necessary strength under the compression condition.
Specifically, in the present embodiment, the outer diameter of the flexible drilling tool 2 is not less than the outer diameter of the smallest drill collar in the field borehole. The flexible drilling tool with the structure can effectively ensure the strength of the flexible drilling tool. Specifically, in the present embodiment, the drilling mode of the flexible drilling tool 2 is a rotary table, a top drive mode and a composite drilling mode. The drilling modes in various forms are favorable for the drilling tool assembly to be suitable for complex strata such as soft and hard staggered formations, large inclination angles and the like, and the drilling tool assembly has a good effect.
Specifically, in the present embodiment, the centralizer 3 is an undersized centralizer, and the outer diameter of the centralizer 3 is smaller than the outer diameter of the drill bit 1. The centralizer adopting the structure can ensure that the drilling tool assembly plays a good supporting role in the drilling process, and the flexible drilling tool overcomes the self gravity to generate lower bow deformation. Specifically, in the present embodiment, the centralizer 3 is a common centralizer for drilling, and the drill bit 1 is a roller cone drill bit or a PDC drill bit. The drilling tool combination adopting the common conventional drilling tool combination is easy to produce, maintain and use, has low manufacturing cost and use cost compared with the existing drilling tool, has stable performance, and can not bring other risks to drilling operation in the use process.
According to the embodiment, the rigid-flexible deformation inclination-prevention quick drilling tool assembly is simple in structure, economical and effective, and after the drilling tool assembly is deformed due to stress, a drill bit corner facing the well descending inclination direction is generated at the drill bit, so that the drilling tool assembly drills towards the axial direction of the drill bit, and the well inclination angle is continuously reduced. And along with the increase of the drilling pressure, the deflection angle of the drill bit is gradually increased after the drilling tool assembly deforms, the inclination prevention effect of the drilling tool assembly is also gradually enhanced, and the dual purposes of improving the mechanical drilling speed and effectively controlling the well inclination to ensure the well quality are achieved while the drilling pressure is increased.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A rigid-flexible deformation anti-deviation quick drilling tool combination is characterized by comprising a drill bit, a flexible drilling tool, a centralizer and a heavy drill collar which are sequentially connected from bottom to top.
2. The rigid-flex anti-whip quick drill assembly of claim 1, wherein the length of the flexible drill is 5-8 m.
3. The rigid-flex anti-whip quick drill assembly of claim 2, wherein the length of the flexible drill is 6-8 m.
4. The rigid-flexible deformation deviation prevention and rapid drilling assembly according to any one of claims 1 to 3, wherein the flexible drilling tool is a small-sized screw drilling tool.
5. A rigid-flex deformation anti-whip quick-drilling assembly as claimed in any one of claims 1 to 3, wherein the flexible drilling tool employs a fine drill collar.
6. The rigid-flex deformation whip preventing rapid drilling assembly as claimed in any one of claims 1 to 3, wherein an outer diameter of the flexible drilling tool is not less than an outer diameter of a smallest drill collar in a field borehole.
7. The rigid-flexible deformation anti-deviation quick drilling assembly according to any one of claims 1 to 3, wherein the flexible drilling tool is drilled in a rotary table, a top drive mode and a composite drilling mode.
8. A rigid-flexible deformation slant entry prevention quick drilling assembly as claimed in any one of claims 1 to 3 wherein the centralizer is an undersized centralizer, the outer diameter of the centralizer being smaller than the outer diameter of the drill bit.
9. A rigid-flexible deformation slant entry prevention fast drilling assembly according to any one of claims 1 to 3, wherein the centralizer is a common centralizer for drilling.
10. A rigid-flex anti-slant drilling assembly according to any one of claims 1 to 3, wherein the drill bit is a roller cone bit or a PDC bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278771.2A CN113513265A (en) | 2020-04-10 | 2020-04-10 | Rigid-flexible deformation anti-deviation quick drilling tool combination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278771.2A CN113513265A (en) | 2020-04-10 | 2020-04-10 | Rigid-flexible deformation anti-deviation quick drilling tool combination |
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| CN113513265A true CN113513265A (en) | 2021-10-19 |
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| US5857531A (en) * | 1997-04-10 | 1999-01-12 | Halliburton Energy Services, Inc. | Bottom hole assembly for directional drilling |
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| CN202900044U (en) * | 2012-11-16 | 2013-04-24 | 中国石油天然气股份有限公司 | Double stabilizer prebuckling dynamics pendulum drilling assembly |
| CN106703695A (en) * | 2017-01-18 | 2017-05-24 | 中国石油大学(华东) | High WOB anti-deviation well straightening drill assembly |
| CN107965277A (en) * | 2016-10-20 | 2018-04-27 | 中国石油化工股份有限公司 | A kind of drill assembly |
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2020
- 2020-04-10 CN CN202010278771.2A patent/CN113513265A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015673A (en) * | 1974-07-11 | 1977-04-05 | Standard Oil Company (Indiana) | Directional drilling system |
| US4653598A (en) * | 1984-11-23 | 1987-03-31 | Atlantic Richfield Company | Drainhole drilling assembly with oriented elliptic drill collar |
| CN2282057Y (en) * | 1996-12-17 | 1998-05-20 | 大庆石油管理局钻井二公司 | Eccentric anti-inclining drill combination |
| US5857531A (en) * | 1997-04-10 | 1999-01-12 | Halliburton Energy Services, Inc. | Bottom hole assembly for directional drilling |
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| CN106703695A (en) * | 2017-01-18 | 2017-05-24 | 中国石油大学(华东) | High WOB anti-deviation well straightening drill assembly |
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