Cuttings recovery while drilling

Abstract

The present invention provides a debris recovery device while drilling, comprising a rod body having a first end and an opposite second end, wherein a through hole is defined inside the rod body along its axial direction and passes through from the first end to the second end, wherein the through hole has a first inner diameter section close to the first end and a second inner diameter section between the first inner diameter section and the second end and narrowed relative to the first inner diameter section, and a debris recovery cylinder with an opening facing away from the first end is defined on a peripheral wall of the rod body surrounding the second inner diameter section.

Description

Technical Field

[0001] The invention relates to the technical field of oil field development and production, in particular to a drilling debris recovery device. Background Art

[0002] With the further development of oilfield production technology, the oilfield operation area is constantly expanding, and the drilling and completion operation conditions are becoming more and more complex, especially the ultra-deep well drilling conditions are increasing year by year. The return of debris in ultra-deep well drilling operations has always been an important factor that hinders the smooth progress of operations, especially in the gap between the connecting columns or other operation gaps. The unreturned debris is quickly deposited or the well wall is unstable, resulting in a large number of blocks falling off, which is very easy to bury the drill tools, causing complex situations and even drilling accidents.

[0003] Some of the currently known oil well debris recovery devices have some problems. For example, in the Chinese invention application CN104712278A entitled "Large-Size Falling Object Salvage Cup" published on June 17, 2015, it is proposed that a fan-shaped salvage cup be provided on the lower cup rod of the cup body, which is eccentrically arranged relative to the lower cup rod, and the salvage cup surrounds the lower cup rod and forms a debris return accommodation space between the lower cup rod. This salvage cup is mainly suitable for single salvage operations, and it needs to start the pump to form impact pressure to work, and has high requirements for the working environment. In addition, the design of this salvage cup surrounding the lower cup rod is prone to poor mechanical performance and low strength of the eccentric structure of the salvage cup, with a high risk of falling off, which cannot meet the requirements of drilling while drilling.

[0004] Another example is the Chinese utility model patent CN204457546U entitled "Eccentric scoop cup mill shoe" published on July 8, 2015, which proposes to cover the scoop cup on the outside of the mill shoe body and form a chamber for collecting debris between the scoop cup and the mill shoe body. This scoop cup is mainly used for milling operations, and is similar to CN104712278A. The eccentric structure is achieved by offsetting the scoop cup sleeve as the outer cylinder wall relative to the mill shoe body. The mechanical performance is poor, and the risk of eccentric parts falling off is very high, which cannot meet the requirements of drilling while drilling.

[0005] For example, in the Chinese utility model patent CN206636526U entitled "Floating Drilling Cup" published on November 14, 2017, it is proposed to set an outer working cylinder and an inner working cylinder on the joint, and form a debris sinking chamber between the inner and outer working cylinders to collect debris. This kind of bailing cup is mainly suitable for casing drilling, and has a complex structure and limited volume of recoverable debris.

[0006] The conventional drilling-while-drilling cup mentioned above has certain problems in terms of tool mechanical strength, debris recovery efficiency, and recoverable debris diameter. Especially in the current ultra-deep well drilling operation, it cannot meet the needs of on-site operations. Summary of the invention

[0007] The present invention aims to provide a drilling debris recovery device which can at least solve part of the above technical problems.

[0008] According to an embodiment of the present invention, a drilling debris recovery device is provided, comprising a rod body having a first end and an opposite second end, wherein a through hole is defined inside the rod body along its axial direction and passes through from the first end to the second end, wherein the through hole has a first inner diameter section close to the first end and a second inner diameter section between the first inner diameter section and the second end and narrowed relative to the first inner diameter section, and a debris recovery cylinder with an opening facing away from the first end is defined on a peripheral wall of the rod body surrounding the second inner diameter section.

[0009] In some embodiments, the first inner diameter section is coaxial with the rod body, and the second inner diameter section is eccentrically arranged relative to the first inner diameter section, the thickness of one side of the peripheral wall of the rod body surrounding the second inner diameter section is greater than the thickness of the other side, and the debris recovery tube is formed on the side with the larger thickness of the peripheral wall.

[0010] In some embodiments, the eccentric structure of the second inner diameter section is configured such that, viewed from an axial cross-section of the rod body, an inner circumferential surface on one side of the second inner diameter section is flush with an inner circumferential surface on the same side of the first inner diameter section, while an inner circumferential surface on the other side is retracted relative to the inner circumferential surface on the same side of the first inner diameter section, and a side with a larger thickness of the circumferential wall is defined between the retracted inner circumferential surface of the second inner diameter section and the outer circumferential surface of the rod body.

[0011] In some embodiments, a circumferential wall of the rod body surrounding the second inner diameter section forms a groove open to the center axis of the rod body, and the debris recovery barrel is connected to the groove.

[0012] In some embodiments, the groove is formed near the second end of the rod body, and the debris recovery tube is composed of a hole extending from a side wall of the groove along the axis of the rod body toward the first end of the rod body.

[0013] In some embodiments, the rod body is integrally formed.

[0014] In some embodiments, an outer wall surface of the debris recovery barrel has a guide groove leading to an opening of the debris recovery barrel.

[0015] In some embodiments, the guide groove is a rotating guide groove extending in a spiral shape along the outer wall surface of the debris recovery barrel.

[0016] In some embodiments, the through hole of the rod body further has a third inner diameter section connected to the second inner diameter section, the first inner diameter section defines an outlet of the through hole, and the third inner diameter section defines an inlet of the through hole.

[0017] In some embodiments, the third inner diameter section is coaxially disposed with the rod body.

[0018] The drilling debris recovery device involved in the present invention utilizes the inner diameter difference between different sections of the internal through hole of the rod body to form a debris recovery cylinder, and the debris recovery cylinder can be further set eccentrically. By reasonably calculating the inner diameter difference, the capacity of the debris recovery cylinder and the diameter of the recoverable debris can be maximized. The debris recovery cylinder designed by the inner diameter difference has reliable structural strength and has no risk of falling off during drilling operations. In addition, this debris recovery device can be processed by an integrated molding process, for example, using an integrated deep hole processing molding process to effectively improve the mechanical strength of the tool. The guide groove on the outer wall of the debris recovery cylinder can effectively improve the debris return effect, and the annular space return speed difference formed by the debris rising along the outer wall of the debris recovery cylinder to the groove part of the rod body can promote the debris to fall back into the debris recovery cylinder, thereby improving the debris recovery efficiency.

[0019] Preferred features of the invention are described in part below and in part will be apparent from reading the text. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 is a schematic diagram of a drilling debris recovery device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is described in detail below in conjunction with specific implementation methods and drawings. Here, the exemplary implementation methods of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0023] Figure 1 A debris recovery device for drilling according to an embodiment of the present invention is shown. As shown in the figure, the debris recovery device for drilling includes a long rod body 1, and the rod body 1 has a central axis X. A through hole 2 is provided in the rod body 1, and the through hole 2 extends from the first end 11 of the rod body 1 to the second end 12 of the rod body 1 along the axis X direction, thereby penetrating the rod body 1. The through hole 2 is variable in diameter, that is, an inner diameter difference is formed between different sections, and the inner diameter difference is used to form a debris recovery cylinder 3. As shown in the figure, the through hole 2 forms a first inner diameter section 21 near the first end of the rod body 1, and the central axis of the first inner diameter section 21 coincides with the central axis X of the rod body 1. Connected to the first inner diameter section 21 is the second inner diameter section 22 of the through hole 2, and the second inner diameter section 22 is located between the first inner diameter section 21 and the second end of the rod body 2, and the diameter of the second inner diameter section 22 is smaller than the diameter of the first inner diameter section 21. The second inner diameter section 22 narrowed relative to the first inner diameter section 21 enables the peripheral wall of the rod body 1 surrounding the second inner diameter section 22 to define a debris recovery barrel 3 for collecting debris.

[0024] Through the diameter difference between the first inner diameter section 21 and the second inner diameter section 22, the debris recovery tube 3 can be set eccentrically relative to the central axis X of the rod body 1, which helps to collect and salvage the debris that is turned up when the drill bit rotates. Moreover, by reasonably calculating the diameter difference between the first inner diameter section 21 and the second inner diameter section 22, it can be ensured that the recovery capacity and inner diameter of the debris recovery tube 3 are sufficient to maximize the diameter of the recoverable debris. It has been verified that the debris recovery device formed by the solution of the present invention can increase the limit diameter of the recoverable debris by 35% compared with the limit diameter of the debris that can be recovered by the traditional scoop cup, greatly improving the debris recovery capacity.

[0025] In the illustrated embodiment, the opening 31 of the debris recovery barrel 3 faces the second end 12 of the rod body 1 , and the debris flipped toward the second end of the rod body 1 by the impact of the fluid rushing out from the first end 11 of the rod body 1 can fall into the barrel through the opening 31 of the debris recovery barrel 3 .

[0026] The drilling-while-drilling debris recovery device according to the present invention can be lowered while drilling in ultra-deep well drilling operations to achieve synchronous drilling-while-drilling debris recovery, thereby reducing operation risks and improving safety factors.

[0027] In the illustrated embodiment, the second inner diameter section 22 of the through hole 2 of the rod body 1 is eccentrically arranged relative to the rod body 1. Figure 1 The cross section of the rod body 1 shown in FIG. 1 clearly shows that the inner circumference of one side of the second inner diameter section 22 is flush with the inner circumference of the same side of the first inner diameter section 21, while the inner circumference of the other side of the second inner diameter section 22 is retracted inward relative to the inner circumference of the same side of the first inner diameter section 21 toward the central axis X of the rod body 1. In this way, in the peripheral wall of the rod body 1 surrounding the second inner diameter section 22, the wall thickness of one side is smaller than the wall thickness of the other side, and the debris recovery barrel 3 is formed on the side with the larger wall thickness.

[0028] In an embodiment not shown, the central axis of the second inner diameter section 22 coincides with the central axis of the rod body 1, and the second inner diameter section 22 is retracted relative to the first inner diameter section 21, so that the peripheral wall of the rod body 1 around the second inner diameter section 22 forms a certain wall thickness, and the diameter difference between the first inner diameter section 21 and the second inner diameter section 22 is designed so that the wall thickness is sufficient to form a debris recovery barrel 3.

[0029] In some embodiments, the third inner diameter section 23 of the through hole 2 is connected to the second inner diameter section 22 and is located at the second end 12 of the rod body 1. The central axis of the third inner diameter section 23 can coincide with the central axis X of the rod body 1. The third inner diameter section 23 defines the inlet of the through hole 2, and the first inner diameter section 21 defines the outlet of the through hole 2. The fluid is introduced into the through hole 2 through the inlet of the through hole 2, and flows out from the outlet of the through hole 2 after passing through the third inner diameter section 23, the second inner diameter section 22 and the first inner diameter section 21 in sequence, and impacts the debris at the bottom of the well and flips upward. When the debris passes above the opening 31 of the debris recovery barrel 3, the fluid movement speed decreases due to the sudden increase in the annular area, so that the debris begins to fall and falls into the barrel when it is aligned with the debris recovery barrel 3, or when the debris touches the barrel wall at the opening of the rotating debris recovery barrel 3, it will be pushed by the barrel wall to move toward the center of the barrel, or it can fall into the barrel to be salvaged.

[0030] like Figure 1 It is clearly shown that the rod body 1 is formed with a groove 13 above the debris recovery barrel 3, which is sunken toward the central axis X. The opening of the groove 13 is open to the back of the central axis X and forms an annular space that is enlarged relative to the debris recovery barrel 3. Opposite to the opening is the bottom wall of the groove 13, and on opposite sides of the bottom wall are the side walls of the groove 13. The opening 31 of the debris recovery barrel 3 is formed on the side wall of the groove 13, so that the debris recovery barrel 3 can communicate with the outside world and receive the turned-up debris.

[0031] In the illustrated embodiment, the second inner diameter section 22 is eccentrically arranged relative to the central axis X of the rod body 1, and the groove 13 is formed by machining the thicker side wall of the circumferential wall of the rod body 1 surrounding the second inner diameter section 22, and a long hole can be machined on the side wall of the groove 13 along the axial direction of the rod body 1 toward the first end of the rod body 1, and the long hole is used as the debris recovery barrel 3. In the drilling debris recovery device of the present invention, a large annular space is formed above the opening of the debris recovery barrel 3 by means of the groove 13, thereby increasing the annular return speed difference during the debris upturning process, which helps the debris to be deposited in the debris recovery barrel 3 as much as possible.

[0032] The difference between the diameter of the rod body 1 at the wall of the debris recovery cylinder 3 and the diameter at the groove 13 is significantly increased, which can be increased by 20% compared with the prior art, greatly improving the annular space return speed difference, making it easier for debris to settle into the debris recovery cylinder of structure 3, and the debris recovery efficiency is higher.

[0033] In some embodiments, a guide groove is formed on the outer wall of the debris recovery barrel 3. The guide groove helps to guide the fluid carrying the debris to move toward the opening 31 of the debris recovery barrel 3, thereby improving the debris return effect. The guide groove can be a rotating guide groove extending spirally on the outer wall of the debris recovery barrel. Alternatively, the guide groove can be a linear guide groove extending along a straight line.

[0034] According to the drilling debris recovery device of the present invention, the rod body 1 can be integrally formed, for example, formed by an integrated deep hole processing process, and the tool has high mechanical strength. The integrated design can achieve the optimal mechanical performance of the drilling debris recovery device under the working conditions, and the connecting joint at the second end of the rod body 1 and the part forming the groove 13 can both achieve the optimal design of mechanical strength, thereby improving the overall mechanical strength of the drilling debris recovery device and improving the overall safety factor of the tool. It has been verified that the tensile strength and torsional strength of the drilling debris recovery device according to the present invention can be increased by 30%, fully meeting the requirements of ultra-deep well operations.

[0035] The drilling debris recovery device of the present invention realizes an eccentric design through an integrated variable diameter, which can form a large annular return speed difference at the eccentric part during the drilling operation debris return process, and the debris automatically deposits into the debris recovery cylinder. Considering the influence of the eccentricity factor, the integrated increase of the debris recovery annular gap and the debris recovery efficiency while improving the mechanical performance strength, realizes the ultra-deep well drilling debris recovery, solves the ultra-deep well drilling operation, especially the debris recovery problem under the condition of unstable well wall, and has broad application prospects.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The mechanical strength of the drilling debris recovery device is higher, meeting the requirements of drilling operations in ultra-deep wells;

[0038] (2) The debris recovery device can recover larger debris, meeting the requirements for recovering debris from the wellbore wall;

[0039] (3) Increase turbulence effect and improve debris return effect.

[0040] Although the present application is mainly described exemplarily based on the field of oil production, those skilled in the art will understand that the drilling debris recovery device of the present application can be applied to other fields, such as mine mining, etc.

[0041] In this document, multiple embodiments of the present invention are described, but for the sake of brevity, the description of each embodiment is not exhaustive, and the same or similar features or parts between the embodiments may be omitted. In this document, the specific features, structures, materials or characteristics of each embodiment may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0042] In this document, the terms "comprises," "comprising" or variations thereof are intended to be inclusive rather than exhaustive, such that a process, method, product or apparatus that includes a list of elements may include these elements without excluding other elements not explicitly listed.

[0043] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above-mentioned embodiments, which are merely examples of the best modes for implementing the present systems and methods. It will be appreciated by those skilled in the art that various changes may be made to the embodiments of the systems and methods described herein when implementing the present systems and / or methods without departing from the spirit and scope of the present invention as defined in the appended claims. The appended claims are intended to define the scope of the present systems and methods, so systems and methods falling within these claims and equivalents thereof may be covered. The above description of the present systems and methods should be understood to include all new and non-obvious combinations of elements described herein, and there may be claims in the present application or subsequent applications involving any new and non-obvious combination of elements. In addition, the above-mentioned embodiments are exemplary, and no single feature or element is essential to all possible features and combinations of elements that may be claimed in the present application or subsequent applications.

Claims

1. A drilling debris recovery device, characterized in that: The invention also provides a method for disassembling and transferring the components of the present invention to a user who is interested in the tool and the method for disassembling the components. The invention also provides a method for disassembling and transferring the components of the present invention to the user who is interested in the tool and the method for disassembling the components. The first inner diameter section is coaxial with the rod body, and the second inner diameter section is eccentrically arranged relative to the first inner diameter section. The thickness of one side of the peripheral wall of the rod body surrounding the second inner diameter section is greater than the thickness of the other side. The debris recovery barrel is formed on the side with the larger thickness of the peripheral wall. The eccentric structure of the second inner diameter section is configured such that, viewed from the axial cross section of the rod body, the inner peripheral surface of one side of the second inner diameter section is flush with the inner peripheral surface of the same side of the first inner diameter section, while the inner peripheral surface of the other side is contracted relative to the inner peripheral surface of the same side of the first inner diameter section. The contracted inner peripheral surface of the second inner diameter section and the outer peripheral surface of the rod body define a side of the peripheral wall with a larger thickness. The peripheral wall of the rod body surrounding the second inner diameter section forms a groove open to the back of the central axis of the rod body, and the debris recovery barrel is connected to the groove. The groove is formed near the second end of the rod body, and the debris recovery barrel is composed of a hole extending from the side wall of the groove along the axis of the rod body to the first end of the rod body.

2. The drilling debris recovery device according to claim 1, characterized in that: The through hole of the rod body further has a third inner diameter section connected to the second inner diameter section, the first inner diameter section defines an outlet of the through hole, and the third inner diameter section defines an inlet of the through hole.

3. The drilling debris recovery device according to claim 2, characterized in that: The third inner diameter section is coaxially arranged with the rod body.

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