CN111236858A - Downhole drilling tool suitable for slim-hole drilling and use method thereof - Google Patents
Downhole drilling tool suitable for slim-hole drilling and use method thereof Download PDFInfo
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- CN111236858A CN111236858A CN202010196111.XA CN202010196111A CN111236858A CN 111236858 A CN111236858 A CN 111236858A CN 202010196111 A CN202010196111 A CN 202010196111A CN 111236858 A CN111236858 A CN 111236858A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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Abstract
The invention has protected the downhole drilling tool suitable for slim hole drilling and its operation method, including one opens the combination of drilling tools and two and opens the combination of drilling tools, the structure that one opened the combination of drilling tools is the same as the structure that two opened the combination of drilling tools, from the top down all by the kelly bar, drilling rod, crossover sub, drill collar, screw rod, PDC drill bit connect up sequentially and make up; the outer diameter of the square drill rod in the first drilling tool combination is the same as that of the square drill rod in the second drilling tool combination, and the outer diameter of the drill rod in the first drilling tool combination is the same as that of the drill rod in the second drilling tool combination. The first-cut drilling tool combination is put in when the first-cut drilling is finished, the first-cut drilling tool combination is taken out after the first-cut drilling is finished, the drill collar and the drill bit are only needed to be disassembled and replaced by the small-size drill collar and the drill bit which are needed by the second-cut drilling to form the second-cut drilling tool combination, and the second-cut drilling is continued without replacing a square drill rod or replacing a nearly kilometer drill rod, so that the operation flow is simplified, the operation risk is reduced, and the operation period from the completion of the surface layer drilling to the preparation of the second-cut drilling is shortened.
Description
Technical Field
The invention belongs to the technical field of drilling, and particularly relates to an underground drilling tool suitable for slim hole drilling and a using method thereof.
Background
With respect to the definition of slim hole, different countries and different oil field companies have different respective understandings, some according to the size of the annulus, some according to the hole diameter, and some according to the definition of a hole drilled with a drill bit smaller than 177.8mm for 90% or more of the well sections, the more commonly accepted definition being: 70% of wells with a well depth diameter of less than 177.8mm are slim holes. Slim-hole drilling is favored in the petroleum industry because of its advantages of low energy consumption, low drilling fluid consumption, less waste discharge, etc.
Currently, the commonly used slim hole drilling uses a two-open-hole well structure, e.g. if 6 is to be obtained1/2"small hole drilling, surface hole size91/2", the drilling depth is 500-1000 m, then, when the drilling operation is started, 5 are adopted1/4'Kelly bar + 5' drill bar + conversion joint +61/2Drill collar + screw rod +91/2The surface casing construction is carried out on the drilling tool combination of the PDC drill bit, after the surface casing construction is finished, the one-cut drilling tool combination is taken out, the two-cut drilling operation is carried out, and 3 is adopted1/2' Kelly rod +4 ' drill rod + conversion joint +5 ' drill collar + screw rod +61/2The drilling tool assembly of the PDC drill bit is subjected to technical casing construction.
However, before the first-opening surface layer is drilled to the second-opening well, because the size of the kelly bar, the size of the drill rod, the size of the drill collar and the size of the drill bit used for the first opening are different from the size of the kelly bar, the size of the drill rod, the size of the drill collar and the size of the drill bit used for the second opening, the kelly bar, the drill rod, the drill collar and the drill bit need to be replaced, it can be seen that the first-opening drilling tool combination is almost completely abandoned and a new drilling tool string is assembled again, particularly the replacement of the drill rod needs to stretch out all the drill rods of the first opening and then connect the second-opening drilling rods with the same length, and in the surface layer construction, the length of each drill rod is usually 9.5 meters, so 50-100 drill rods need to be replaced, the workload is undoubtedly increased in the field construction, the operation period is prolonged, the operation flow is complicated, and high-risk.
Disclosure of Invention
The invention aims to provide an underground drilling tool suitable for slim hole drilling and a use method thereof, and aims to solve the problems that when the conventional slim hole drilling adopts a two-open well depth structure, a large amount of drilling tools need to be replaced before a first open surface layer and a second open well, so that the operation flow is complex and the operation period is long; the second purpose is to solve the problems of large operation risk and low efficiency in the process of replacing the drilling tool, particularly tightening the drill rod.
In order to solve the technical problem, the invention provides an underground drilling tool suitable for slim hole drilling, which at least comprises a first drilling tool combination for first drilling and a second drilling tool combination for second drilling, wherein the structure of the first drilling tool combination is the same as that of the second drilling tool combination, and the first drilling tool combination and the second drilling tool combination are respectively formed by sequentially connecting a kelly bar, a drill rod, a conversion joint, a drill collar, a screw and a PDC drill bit from top to bottom;
the outer diameter of the square drill rod in the first drilling tool combination is the same as that of the square drill rod in the second drilling tool combination, and the outer diameter of the drill rod in the first drilling tool combination is the same as that of the drill rod in the second drilling tool combination.
The invention also provides a using method of the down-hole drilling tool suitable for slim hole drilling, which comprises the following steps:
s001. first drill
Drilling a surface well hole from the ground by using a drilling tool combination, continuously drilling to a designed depth, then taking out the drilling tool combination, putting a surface casing pipe in, cementing and waiting for setting;
s002, second drilling
And replacing the drill collar and the PDC drill bit below the one-opening drill tool combination to form a two-opening drill tool combination, putting the two-opening drill tool combination into the surface casing, continuing drilling, and putting the technical casing or the oil layer casing to complete the well.
Further, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", the design depth is 500-1000 m, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Preferably, the second drilling of step S002 specifically includes:
s201, after the one-opening drilling tool combination is started up, the 3 of the one-opening drilling tool combination is reserved1/2The 'kelly bar, 4' drill bar and adapter are removed, the lower part 61/2Drill collar and 91/2"PDC drill bit, change to5' drill collar and 61/2PDC drill bit, one-opening drilling tool combination 31/2Kelly rod, 4 drill rod, adapter and replaced 5 drill collar and 61/2The PDC drill bit is combined into a two-way drilling tool combination;
s202, the secondary drilling tool combination is put into the surface casing, drilling is continued, and a technical casing or an oil layer casing is put into the well to complete the well.
Further, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", design depth 500 meters, then select the following drilling tool:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Preferably, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", design depth 767 meters, then the following drilling tool was selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Further, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", the design depth is 890 meters, then the following drilling tools are selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar and adapter、61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Preferably, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", design depth 945 meters, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Further, if the intended target slim hole size is 61/2", the surface wellbore size is preset to 91/2", the design depth is 1000 meters, then the following drilling tools are selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
The invention has the following beneficial effects:
the first-cut drilling tool combination is put in when the first-cut drilling is finished, the first-cut drilling tool combination is taken out after the first-cut drilling is finished, the drill collar and the drill bit are only needed to be disassembled and replaced by the small-size drill collar and the drill bit needed by the second-cut drilling to form the second-cut drilling tool combination, and the second-cut drilling is continued without replacing a square drill rod or replacing a nearly kilometer drill rod, so that the operation flow is simplified, the operation risk is reduced, and the operation period from the completion of the surface layer drilling to the preparation of the second-cut drilling is shortened.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a downhole drilling tool suitable for slim hole drilling.
FIG. 2 is a flow chart of the use of a downhole drilling tool suitable for slim hole drilling.
Fig. 3 is a detailed flow chart of the second drill.
Description of reference numerals:
1. a kelly bar; 2. a drill stem; 3. a crossover sub; 4. a drill collar; 5. a screw; a PDC bit.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the upper, lower, left and right sides in the drawings are regarded as the upper, lower, left and right sides of the downhole drilling tool for slim hole drilling described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The first embodiment:
the first embodiment of the invention relates to a downhole drilling tool suitable for slim-hole drilling, which at least comprises a first drilling tool combination for first drilling and a second drilling tool combination for second drilling, wherein the structure of the first drilling tool combination is the same as that of the second drilling tool combination, and the first drilling tool combination and the second drilling tool combination are sequentially connected from top to bottom and consist of a kelly bar 1, a drill bar 2, a conversion joint 3, a drill collar 4, a screw 5 and a PDC drill bit 6;
wherein, the external diameter of the square drill rod 1 in the first drilling tool combination is the same as the external diameter of the square drill rod 1 in the second drilling tool combination, and the external diameter of the drill rod 2 in the first drilling tool combination is the same as the external diameter of the drill rod 2 in the second drilling tool combination.
In the two-opening well-making structure, two times of drilling are needed, namely a first drilling well and a second drilling well, specifically, the first drilling well is used for drilling a surface well hole from the ground to a certain design depth and then drilling a surface casing pipe; the secondary drilling is to continue drilling from the surface casing by using a smaller drill bit, if the stratum is not complex, the secondary drilling can directly drill to a target stratum and then go down to an oil layer casing for well completion, and if the stratum is complex and is difficult to control by using drilling fluid, a technical casing needs to be put down.
On the basis of the basic common knowledge of slim hole drilling, if the slim hole drilling needs to be constructed, firstly, a drilling tool combination needs to be prepared in advance, namely, a kelly 1, a drill rod 2, a crossover sub 3, a drill collar 4, a screw rod 5 and a PDC drill bit 6 are sequentially connected from top to bottom, then, the drilling is performed once, the design depth is completed, after the surface layer is drilled, the drilling tool combination is taken out, the drill collar 4 and the PDC drill bit 6 are detached and replaced by the drill collar 4 and the PDC drill bit 6 with the required sizes, and the pipe column at the moment becomes the drilling tool combination with two openings, continues to drill, and is lowered into a technical casing or an oil layer casing to complete the well.
It can be seen that, in the embodiment, before the surface layer is drilled into the second-opening well, only the drill collar 4 and the PDC drill bit 6 in the first-opening drilling tool combination need to be removed, and replaced with the drill collar 4 and the PDC drill bit 6 which are small in size and needed by the second-opening well, because the drill collar 4 and the PDC drill bit 6 are short in length, the drill collar can be replaced rapidly, compared with the traditional method for replacing a nearly kilometer drill rod and replacing a kelly, a drill collar and a drill bit, the embodiment only needs to replace the drill collar 4 and the PDC drill bit 6, the operation period is shortened, the operation risk of tightening is reduced, and the method is simpler and more reliable.
When the drill collar 4 and the PDC drill bit 6 are replaced, the connecting screw rod 5 between the drill collar 4 and the PDC drill bit 6 needs to be replaced, and the size of the connecting screw rod 5 matched with the drill collar 4 and the PDC drill bit 6 is changed.
In the embodiment, the sizes of the first-opening and second-opening kelly bars 1, the drill bars 2 and the adapter 3 are the same, and the replacement is not needed, so that the parts with the same size do not affect the rigidity of the whole drilling tool, the working efficiency is improved, and the trouble of replacement is avoided.
It is worth mentioning that no matter what size of small hole is drilled, the structure of the first drilling tool combination and the structure of the second drilling tool combination are not changed, namely, the first drilling tool combination and the second drilling tool combination are still formed by sequentially connecting a kelly bar 1, a drill rod 2, a conversion joint 3, a drill collar 4, a screw rod 5 and a PDC drill bit 6 from top to bottom, and only the sizes of the drill collar and the drill bit need to be changed.
Second embodiment:
referring to fig. 2, the present embodiment provides a method of using a downhole drilling tool suitable for slim hole drilling, comprising the steps of:
s001. first drill
Drilling a surface well hole from the ground by using a drilling tool combination, continuously drilling to a designed depth, then taking out the drilling tool combination, putting a surface casing pipe in, cementing and waiting for setting;
s002, second drilling
And replacing the drill collar 4 and the PDC drill bit 6 below the first-cut drilling tool combination to form a second-cut drilling tool combination, putting the second-cut drilling tool combination into the surface casing, continuing drilling, and putting the technical casing or the oil layer casing to complete the well.
Specifically, at the first drill-in: sequentially connecting a kelly bar 1, a drill rod 2, a conversion joint 3, a drill collar 4, a screw rod 5 and a PDC drill bit 6 in sequence from top to bottom to form a drilling tool combination, drilling a surface well hole from the ground by using the drilling tool combination, continuously drilling to a designed depth, taking out the drilling tool combination, putting a surface casing pipe in, cementing and waiting for setting;
when the drill is started for the second time: and reserving the kelly bar 1, the drill rod 2 and the adapter 3 of the one-opening drilling tool combination, removing the drill collar 4 and the PDC drill bit 6 below the kelly bar, replacing the kelly bar 1, the drill rod 2 and the adapter 3 of the one-opening drilling tool combination with the replaced small-size 4 and PDC drill bit 6 to form the two-opening drilling tool combination, putting the two-opening drilling tool combination into the surface casing, continuously drilling, and putting the technical casing or the oil layer casing into the well completion.
Before the surface layer is drilled into the second-opening well, only the drill collar 4 and the PDC drill bit 6 in the first-opening drilling tool combination are needed to be detached, and the drill collar 4 and the PDC drill bit 6 which are needed by the second-opening are replaced, and the drill collar 4 and the PDC drill bit 6 are short in length and can be replaced rapidly, so that compared with the traditional method of replacing a nearly kilometer drill rod and replacing a kelly bar, a drill collar and a drill bit, the embodiment only needs to replace two parts, namely the drill collar 4 and the PDC drill bit 6, the operation period is shortened, the operation risk of tightening is reduced, and the method is simpler and more reliable.
The third embodiment:
in the second embodiment, as shown in FIG. 3, if the intended small hole size is 61/2", the surface wellbore size is preset to 91/2", the design depth is 500-1000 m, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
On the basis of the above, the present embodiment provides a method for using a downhole drilling tool suitable for slim hole drilling, comprising the steps of:
s001. first drill
Drilling a surface well hole from the ground by using a drilling tool combination, continuously drilling to a designed depth, then taking out the drilling tool combination, putting a surface casing pipe in, cementing and waiting for setting;
s002, second drilling
And replacing the drill collar 4 and the PDC drill bit 6 below the first-cut drilling tool combination to form a second-cut drilling tool combination, putting the second-cut drilling tool combination into the surface casing, continuing drilling, and putting the technical casing or the oil layer casing to complete the well.
The second drilling of step S002 specifically includes:
s201, after the one-opening drilling tool combination is started up, the 3 of the one-opening drilling tool combination is reserved1/2The 'kelly bar, 4' drill bar and adapter are removed, the lower part 61/2Drill collar and 91/2"PDC drill bit, replaced by 5" drill collar and 61/2PDC drill bit, one-opening drilling tool combination 31/2Kelly rod, 4 drill rod, adapter and replaced 5 drill collar and 61/2The PDC drill bit is combined into a two-way drilling tool combination;
s202, the secondary drilling tool combination is put into the surface casing, drilling is continued, and a technical casing or an oil layer casing is put into the well to complete the well.
Typically, the wellbore size for slim hole drilling is 61/2", the surface borehole size is 91/2", the drilling depth is 500 to 1000 m, so the drilling tool assembly with the above size is preferred in the embodiment.
The embodiment was tested at several of the following sites according to the above procedure, as follows:
(1) x-well, 6 designed as two-opening well structure1/2"slim hole gas well, surface well 91/2", depth 500 meters, the following drilling tools were selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Drilling for the first time: drilling out surface well hole from ground surface by using a drilling tool combination, after drilling to designed depth, starting out a drilling tool combination, and running in 75/8Surface casing, well cementation and setting waiting;
and (5) drilling for the second time: after the one-opening drilling tool combination is taken out, the one-opening drilling tool combination 3 is reserved1/2The 'kelly bar, 4' drill bar and adapter are removed, the lower part 61/2Drill collar and 91/2"PDC drill bit, replaced by 5" drill collar and 61/2PDC drill bit, one-opening drilling tool combination 31/2Kelly rod, 4 drill rod, adapter and replaced 5 drill collar and 61/2The PDC drill bit is combined into a two-opening drilling tool combination, the two-opening drilling tool combination is put into the surface casing, drilling is continued, and a technical casing or an oil layer casing is put into the well to complete the well.
(2) Y well designed as 6 of two-well structure1/2"slim hole gas well, surface well 91/2", depth 760 meters, the following drilling tools were selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
Drilling for the first time: drilling out surface well hole from ground surface by using a drilling tool combination, after drilling to designed depth, starting out a drilling tool combination, and running in 75/8Surface casing, well cementation and setting waiting;
and (5) drilling for the second time: after the one-opening drilling tool combination is taken out, the one-opening drilling tool combination 3 is reserved1/2A kelly bar, a 4 drill bar and a conversion joint are dismantled6 of square1/2Drill collar and 91/2"PDC drill bit, replaced by 5" drill collar and 61/2PDC drill bit, one-opening drilling tool combination 31/2Kelly rod, 4 drill rod, adapter and replaced 5 drill collar and 61/2The PDC drill bit is combined into a two-opening drilling tool combination, the two-opening drilling tool combination is put into the surface casing, drilling is continued, and a technical casing or an oil layer casing is put into the well to complete the well.
The results of use:
the surface drilling period is equivalent to that of a combined well without the drilling tool, the surface drilling period is completed to two times, and compared with 2 wells without the drilling method, the period is shortened by 1.13 days, and accounts for 6.34 percent of the total well drilling period of 17.83 days.
(3) Z-well, 6 designed as two-opening well structure1/2"slim hole gas well, surface well 91/2", depth 767 meters, the following drilling tools were selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
The results of use:
the surface layer drilling period is equivalent to that of a combined well without the drilling tool, the surface layer drilling period is from completion to two opening periods, and compared with 2 wells without the drilling method, the period is shortened by 1.08 days and accounts for 5.4 percent of the whole well drilling period of 20 days.
(4) Well A designed as 6 of two-opening well structure1/2"slim hole gas well, surface well 91/2", depth 890 meters, the following drilling tools were selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
(5) Well B designed as 6 of two-opening well structure1/2"slim hole gas well, surface well 91/2", depth 945 meters, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
(6) C well designed as 6 of two-opening well structure1/2"slim hole gas well, surface well 91/2", depth is 1000 meters, then the following drilling tools are selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
In summary, the downhole drilling tool suitable for slim hole drilling protected by the invention mainly comprises a first opening drilling tool combination and a second opening drilling tool combination, wherein the first opening drilling tool combination is put in during first opening drilling, and the first opening drilling tool combination is taken out after the first opening drilling is finished, only a drill collar and a drill bit are required to be disassembled and replaced by a small-size drill collar and a small-size drill bit required by second opening drilling to form the second opening drilling tool combination, and the second opening drilling is continued without replacing a kelly bar or replacing a nearly kilometer drill bar, so that the operation flow is simplified, the operation risk is reduced, and the operation period of preparing from surface drilling to second opening drilling is shortened.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. The down-hole drilling tool suitable for slim hole drilling is characterized by at least comprising a first drilling tool combination for first drilling and a second drilling tool combination for second drilling, wherein the structure of the first drilling tool combination is the same as that of the second drilling tool combination, and the first drilling tool combination and the second drilling tool combination are respectively formed by sequentially connecting a kelly bar (1), a drill rod (2), a conversion joint (3), a drill collar (4), a screw (5) and a PDC drill bit (6) from top to bottom;
the outer diameter of a square drill rod (1) in the first drilling tool combination is the same as that of a square drill rod (1) in the second drilling tool combination, and the outer diameter of a drill rod (2) in the first drilling tool combination is the same as that of a drill rod (2) in the second drilling tool combination.
2. A method of using a downhole drilling tool adapted for slim hole drilling according to claim 1, comprising the steps of:
s001. first drill
Drilling a surface well hole from the ground by using a drilling tool combination, continuously drilling to a designed depth, then taking out the drilling tool combination, putting a surface casing pipe in, cementing and waiting for setting;
s002, second drilling
And replacing the drill collar (4) and the PDC drill bit (6) below the one-opening drill tool combination to form a two-opening drill tool combination, putting the two-opening drill tool combination into the surface casing, continuing to drill, and putting the technical casing or the oil layer casing to complete the well.
3. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 2, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", the design depth is 500-1000 m, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
4. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 3, wherein the second drilling of step S002 comprises:
s201, after the one-opening drilling tool combination is started up, the 3 of the one-opening drilling tool combination is reserved1/2The 'kelly bar, 4' drill bar and adapter are removed, the lower part 61/2Drill collar and 91/2"PDC drill bit, replaced by 5" drill collar and 61/2PDC drill bit, one-opening drilling tool combination 31/2Kelly rod, 4 drill rod, adapter and replaced 5 drill collar and 61/2The PDC drill bit is combined into a two-way drilling tool combination;
s202, the secondary drilling tool combination is put into the surface casing, drilling is continued, and a technical casing or an oil layer casing is put into the well to complete the well.
5. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 4, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", design depth 500 meters, then select the following drilling tool:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
6. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 4, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", design depth 767 meters, then the following drilling tool was selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
7. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 4, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", the design depth is 890 meters, then the following drilling tools are selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
8. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 4, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", design depth 945 meters, then the following drilling tool is selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
9. The method of using a downhole drilling tool for slim hole drilling as claimed in claim 4, wherein the slim hole size is 6 if the predetermined purpose is set1/2", the surface wellbore size is preset to 91/2", the design depth is 1000 meters, then the following drilling tools are selected:
one-opening drilling tool combination is from top to bottom from 31/2Kelly bar, 4 drill bar, adapter and 61/2Drill collar, screw rod, 91/2The PDC drill bits are connected in sequence;
the two-opening drilling tool combination is from top to bottom from 31/2Kelly rod, 4 drill rod, adapter, 5 drill collar, screw rod and 6 drill rod1/2The PDC drill bits are connected in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010196111.XA CN111236858A (en) | 2020-03-19 | 2020-03-19 | Downhole drilling tool suitable for slim-hole drilling and use method thereof |
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2020
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| US4057116A (en) * | 1972-11-17 | 1977-11-08 | Atlantic Richfield Company | Slim hold drilling |
| CN203161086U (en) * | 2012-12-25 | 2013-08-28 | 中国石油集团川庆钻探工程有限公司 | Inclined shaft section one-trip drilling tool structure |
| CN108071343A (en) * | 2017-12-11 | 2018-05-25 | 中国海洋石油集团有限公司 | The narrow pressure window well three of deep water opens time Casing Program Design Method |
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