阅读说明：本技术 扩眼钻具及定向钻井方法 (Reaming drilling tool and directional drilling method ) 是由 曹丕廷 贾治平 沈春华 于 2021-09-01 设计创作，主要内容包括：本发明提供了一种扩眼钻具及定向钻井方法,扩眼钻具包括：钻头、配合接头、第一扩眼器、钻井马达、锁定器组合体、钻杆钻铤组合体以及第二扩眼器,钻头、配合接头、第一扩眼器、钻井马达、锁定器组合体、钻杆钻铤组合体和第二扩眼器依次连接。本发明利用锁定器组合体和钻杆钻铤组合体连接第一扩眼器和第二扩眼器,可以一次性地扩出第一扩眼井和第二扩眼井,解决现有技术中扩井钻具的起下钻的次数多,造斜率难以保证,扩井效率低下及扩井成本高的问题。(The invention provides a reaming drilling tool and a directional drilling method, wherein the reaming drilling tool comprises: the drill bit, the matching joint, the first reamer, the drilling motor, the locking assembly, the drill rod and drill collar assembly and the second reamer are sequentially connected. The invention utilizes the locking device assembly and the drill rod and drill collar assembly to connect the first reamer and the second reamer, can expand the first reamer and the second reamer at one time, and solves the problems of high tripping times, difficult guarantee of build slope, low well expansion efficiency and high well expansion cost of a well expansion drilling tool in the prior art.)

1. A reaming drilling tool is characterized by comprising a drill bit, a matching joint, a first reamer, a drilling motor, a locking assembly, a drill rod and drill collar assembly and a second reamer, wherein the diameter of the first reamer is different from that of the second reamer, and the drill bit, the matching joint, the first reamer, the drilling motor, the locking assembly, the drill rod and drill collar assembly and the second reamer are sequentially connected.

2. The reaming tool of claim 1, wherein the mating joints comprise a float valve joint, a short drill collar, and a stab joint, the float valve joint, the short drill collar, and the stab joint being connected in series.

3. The reaming drilling tool according to claim 1 or 2, wherein at least three first blades are uniformly distributed on the first reamer in the circumferential direction, and a roller is arranged on each first blade.

4. The reaming drilling tool according to claim 1 or 2, wherein the second reamer is circumferentially and evenly provided with at least four second blades, and the second blades are provided with a slope angle.

5. A method of directional drilling, comprising the steps of:

drilling a first section of pilot hole by using a pilot hole drilling tool;

drilling a second section of pilot hole by using a pilot drilling tool, and communicating the bottom end of the first section of pilot hole with the starting end of the second section of pilot hole;

utilizing a reaming drilling tool to ream the first section of pilot hole well and the second section of pilot hole well to form a first reaming well and a second reaming well;

cementing the first reamed well; and

and cementing the second reaming well.

6. A directional drilling method according to claim 5, wherein the step of drilling a first pilot hole section using a pilot drill comprises the steps of:

drilling to a preset first depth through the pilot drilling tool, wherein the well section with the first depth is a first section pilot well;

pumping bentonite slurry to clean the first pilot hole; and

pumping bentonite slurry to fill the first pilot hole.

7. The directional drilling method according to claim 6, wherein the step of drilling a second pilot hole using a pilot drill to communicate the bottom end of the first pilot hole with the beginning end of the second pilot hole comprises the steps of:

arranging a measuring point in the first section of pilot hole;

calculating an initial well deviation, an initial azimuth and an initial toolface angle according to the measuring points;

directionally slide drilling from the first depth to a predetermined second depth;

performing rotary directional drilling from the second depth to a preset third depth, wherein the well section with the difference value of the third depth minus the first depth is a second pilot well section;

pumping bentonite slurry to clean the second pilot hole;

pumping bentonite slurry to fill the second pilot hole; and

and (6) tripping the drill.

8. A method of directional drilling according to claim 7, wherein the step of directional slide drilling from the first depth to a predetermined second depth comprises:

and a step of back reaming by using the pilot drilling tool comprising a plurality of drill strings, wherein the pilot drilling tool or the back reaming is not pulled after the directional sliding drilling of the first two drill strings of the pilot drilling tool is finished, and the back reaming is performed once after the directional sliding drilling of each drill string is finished from the third drill string of the pilot drilling tool.

9. A method of directional drilling according to claim 5, wherein the step of cementing the first reamed bore comprises the steps of:

running a first composite casing in the first reamed well; and

and pumping cement into a gap between the first reaming well and the first composite casing.

10. A method of directional drilling according to claim 5, wherein the step of cementing the second reamed well comprises the steps of:

running a second composite casing in the second reamed well; and

and pumping cement into the gap between the second reaming well and the second set of composite casing.

Technical Field

The invention relates to the field of marine drilling, in particular to a reaming drilling tool and a directional drilling method.

Background

Compared with the land, the marine surface geology has the characteristics of softness, easy scouring, easy diameter shrinkage and easy collapse, but most of the operations of the directional well deflecting section of the marine development well are started in the marine surface geology. When the reaming drilling is carried out in the marine drilling process, the reaming drilling tool is very easy to weaken the deflection due to the softer stratum of the marine surface layer, the well deflection is reduced, and the deflection rate is difficult to ensure. If a plurality of calibers of reaming wells need to be expanded in one well, the reaming operation is carried out for a plurality of times by the reamer with different calibers, the reaming operation for a plurality of times needs to be carried out for a plurality of times, the reaming cost is increased, the reaming efficiency is reduced, the well deviation can be weakened by the reaming drilling tool which is carried out for a plurality of times, the deviation making difficulty is higher, and the adjacent wells are easy to collide in the reaming operation process of the cluster well. The reaming drilling tool is started for many times, so that underground falling objects are easy to fall, and drilling equipment is easy to lose. The number of times of the drilling tool for the underreaming of the wellhead drill floor is large, and the accidents of personal injury are easy to occur.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a reaming tool and a directional drilling method, which are used to solve the problems of difficulty in ensuring the build-up rate, high tripping times and high cost in reaming a softer marine surface stratum in the prior art.

To achieve the above object, the present invention provides a reaming tool comprising: the drill bit, the matching joint, the drilling motor, the locking assembly, the drill pipe and drill collar assembly and the second reamer are sequentially connected.

Preferably, the matching joint comprises a float valve joint, a short drill collar and a buckle joint, and the float valve joint, the short drill collar and the buckle joint are sequentially connected.

Preferably, the first reamer is uniformly provided with at least three first blades in the circumferential direction, and the first blades are provided with cones.

Preferably, the second reamer is circumferentially and evenly provided with at least four second blades, and the second blades are provided with slope angles.

The invention also provides a directional drilling method, which comprises the following steps:

and drilling a first section of pilot hole by using the pilot hole drilling tool. And drilling a second section of pilot well by using the pilot drilling tool, and communicating the bottom end of the first section of pilot well with the starting end of the second section of pilot well. And reaming the first section of pilot well and the second section of pilot well by using a reaming drilling tool to form a first reaming well and a second reaming well. And cementing the first reaming well. And cementing the second reaming well.

Preferably, the step of drilling the first section of pilot hole with the pilot hole drilling tool comprises the steps of: drilling to a predetermined first depth through the pilot drill tool, wherein the well section with the first depth is a first section pilot well. Pumping bentonite slurry to clean the first pilot hole. Pumping bentonite slurry to fill the first pilot hole.

Preferably, the step of drilling a second section of pilot hole by using a pilot drilling tool and communicating the bottom end of the first section of pilot hole with the starting end of the second section of pilot hole comprises the following steps: and arranging a measuring point in the first section of pilot hole. And calculating an initial well deviation, an initial azimuth and an initial toolface angle according to the measuring points. Directionally slide drilling from the first depth to a predetermined second depth. And performing rotary directional drilling from the second depth to a preset third depth, wherein the well section with the difference value of the third depth minus the first depth is a second pilot well section. Pumping bentonite slurry to clean the second pilot hole. Pumping bentonite slurry to fill the second pilot hole. And (6) tripping the drill.

Preferably, the step of directional slide drilling from the first depth to a predetermined second depth comprises: and a step of back reaming by using the pilot drilling tool comprising a plurality of drill strings, wherein the pilot drilling tool or the back reaming is not pulled after the directional sliding drilling of the first two drill strings of the pilot drilling tool is finished, and the back reaming is performed once after the directional sliding drilling of each drill string is finished from the third drill string of the pilot drilling tool.

Preferably, the step of cementing the first reamed well comprises the steps of: a first composite casing is run in the first reamed well. And pumping cement into a gap between the first reaming well and the first composite casing.

Preferably, the step of cementing the second reamed well comprises the steps of: running a second composite casing in the second reamed well. And pumping cement into the gap between the second reaming well and the second set of composite casing.

The invention has the following beneficial effects: the first reamer and the second reamer are connected by the locker assembly and the drill rod and drill collar assembly, so that a first reaming well and a second reaming well with different diameters can be expanded at one time, the tripping times of a well expanding drilling tool can be reduced, the weakening of the build-up rate is reduced, the well expanding efficiency is improved, and the well expanding cost is reduced.

Drawings

FIG. 1 is a schematic view of a reamer tool according to a first embodiment of the present invention;

FIG. 2 is an elevation view of a first reamer in accordance with a first embodiment of the present invention;

FIG. 3 is a bottom view of the first reamer in accordance with the first embodiment of the present invention;

FIG. 4 is an elevation view of a second reamer in accordance with a first embodiment of the present invention;

FIG. 5 is a left side view of a second reamer of the first embodiment of the present invention;

FIG. 6 is a schematic illustration of a first reamed well and a second reamed well coupled according to a second embodiment of the invention;

FIG. 7 is a flow chart of a directional drilling method according to a second embodiment of the present invention;

FIGS. 8-12 are sub-flow diagrams of a directional drilling method according to a second embodiment of the present invention;

FIG. 13 is a schematic view of the installation of a first compound conduit and a second compound conduit in a second embodiment of the invention.

Wherein, the reference numbers:

1 reaming drilling tool

10 bit

11 mating joint

110 float valve joint

111 short drill collar

112 buckle changing joint

12 first reamer

120 first blade

13 drilling motor

14 lock assembly

15 drill pipe and drill collar assembly

16 second reamer

160 second blade

2 first reamed well

3 second reaming well

4 first composite sleeve

5 second composite sleeve

S1-S5 steps

S10-S12 substeps

S20-S26 substeps

S220 substep

S40-S41 substeps

S50-S51 substeps

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

Referring to fig. 1 and fig. 6, the present embodiment provides a reaming tool 1, including: the drill bit 10, the mating joint 11, the first reamer 12, the drilling motor 13, the locking assembly 14, the drill pipe and drill collar assembly 15 and the second reamer 16 are sequentially connected, wherein the diameter of the first reamer 12 is different from the diameter of the second reamer 16, and the drill bit 10, the mating joint 11, the first reamer 12, the drilling motor 13, the locking assembly 14, the drill pipe and drill collar assembly 15 and the second reamer 16 are sequentially connected. Preferably, the drill bit 10 is of a diameter ofA large roller cone drill bit. Connecting a first reamer 12 and a second reamer 1 using a lock assembly 14 and a drill pipe collar assembly 156, the first reaming well 2 and the second reaming well 3 can be expanded at one time, the drilling tripping times of the well expanding drilling tool 1 can be reduced, the weakening of the build-up rate is reduced, the well expanding efficiency is improved, and the well expanding cost is reduced.

Preferably, as shown in fig. 1, the mating connector 11 comprises a float valve connector 110, a short drill collar 111 and a buckle connector 112, and the float valve connector 110, the short drill collar 111 and the buckle connector 112 are connected in sequence. Preferably, the short drill collar 111 is 3m in length. A mating sub 11 is provided between the drill bit 10 and the first reamer 12 such that the mating sub 11 generates a better guiding force during reaming to achieve better control of the reaming trajectory.

Preferably, as shown in fig. 2 and 3, at least three first blades 120 are uniformly arranged on the first reamer 12 in the circumferential direction, and a roller is arranged on the first blades 120. Preferably, the first reamer 12 is 558.8mm in diameter.

Preferably, as shown in FIGS. 4 and 5, at least four second blades 160 are uniformly arranged on the second reamer 16 in the circumferential direction, and the second blades 160 are provided with a slope angle. Preferably, the second reamer 16 is 711.2mm in diameter. The provision of the second blades 160 with a ramp angle facilitates passage of the second reamer 16 through an underwater pilot hole such that the overall exterior configuration of the second reamer 16 is generally regular and does not impair the reaming effect.

Example two

Referring to fig. 6 and 7, the present embodiment provides a directional drilling method, including the following steps:

s1: and drilling a first section of pilot hole by using the pilot hole drilling tool.

S2: and drilling a second section of pilot well by using the pilot drilling tool, and communicating the bottom end of the first section of pilot well with the starting end of the second section of pilot well.

S3: and reaming the first section of pilot hole well and the second section of pilot hole well by using a reaming drilling tool 1 to form a first reaming well 2 and a second reaming well 3. Preferably, the first reamer 2 has a length of 406.42m (meters, the same applies below) and the second reamer 3 has a length of 171.69 m.

S4: the first reamed well 2 is cemented.

S5: the second reamed well 3 is cemented. The first reamer 12 and the second reamer 16 are connected by the lock assembly 14 and the drill rod and drill collar assembly 15, and the reaming drilling tool 1 can expand the first reaming well 2 and the second reaming well 3 at one time after steps S1-S5, so that the drilling times of the reaming drilling tool 1 can be reduced, the weakening of the build-up rate is reduced, the well expansion efficiency is improved, and the well expansion cost is reduced.

Preferably, as shown in fig. 8, the step S1 includes the steps of:

s10: drilling to a predetermined first depth through the pilot drill tool, wherein the section of the well having the first depth is a first section of the pilot well. Preferably, the first depth is 200 m.

S11: pumping bentonite slurry to clean the pilot hole of the first section. Preferably, the dosage of the bentonite slurry for cleaning the first section of pilot hole is 8m³。

S12: pumping bentonite slurry to fill the first pilot hole. Preferably, the dosage of the bentonite slurry for filling the first pilot hole is 20m³。

Preferably, as shown in fig. 9, the step S2 includes the steps of:

s20: and arranging a measuring point in the pilot hole of the first section. Preferably, the station depth is 154.84 m.

S21: an initial well deviation, an initial orientation, and an initial toolface angle are calculated from the measured points. Preferably, the initial well deviation is 0.25, the initial orientation is 90, and the initial toolface angle is 25.

S22: directional slide drilling from a first depth to a predetermined second depth. Preferably, the second depth is 358 m.

S23: and rotationally and directionally drilling from the second depth to a preset third depth, wherein the well section with the difference value of the third depth minus the first depth is a second pilot well section. Preferably, the third depth is 413.2m and the aforementioned preferred first depth is 200m, the difference between the third depth minus the first depth is 413.2m-200m equal to 213.2m, i.e. the length of the second pilot hole is preferably 213.2 m.

S24: pumping bentonite slurry to clean the second section of pilot hole. Preferably, the dosage of the bentonite slurry for cleaning the second section of pilot hole is 15m³。

S25: pumping bentonite slurry to fill the second pilot hole. Preferably, the dosage of the bentonite slurry for filling the second section of pilot hole is 65m³。

S26: and (6) tripping the drill.

Preferably, as shown in fig. 10, step S22 includes:

s220: and a step of back reaming by using a pilot drilling tool comprising a plurality of drill strings, wherein the pilot drilling tool or the back reaming is not pulled after the directional sliding drilling of the first two drill strings of the pilot drilling tool is finished, and the back reaming is performed once after the directional sliding drilling of each drill string is finished from the third drill string of the pilot drilling tool.

Preferably, referring to fig. 11 and 13 together, step S4 includes the following steps:

s40: a first composite casing 4 is run in the first reamed well 2. Preferably, the first composite sleeve 4 has a pipe diameter of

S41: cement is pumped into the gap between the first reamed well 2 and the first composite casing 4.

Preferably, referring to fig. 12 and 13 together, step S5 includes the following steps:

s50: a second composite casing 5 is run in the second reamer 3. Preferably, the pipe diameter of the second composite sleeve 5 is

S51: cement is pumped into the gap between the second reamed well 3 and the second set of composite casing 5.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.