阅读说明：本技术 孔口钻杆浮动密封装置 (Drill pipe floating sealing device ) 是由 翟立新 邓军 董小卫 何光峰 徐航 孙志民 吴文奎 宁甲旭 张衡 李鑫 于 2019-09-03 设计创作，主要内容包括：本发明公开了一种孔口钻杆浮动密封装置,它包括一次密封机构(1)、中间连接法兰(2)、二次密封机构(3)和转动部件(4)；中间连接法兰(2)为工字型管体,中间连接法兰(2)的上法兰盘固定一次密封机构(1),中间连接法兰(2)的下法兰盘固定二次密封机构(3),二次密封机构(3)下底面固定连接转动部件(4)。本发明能够随钻杆直径变化自动调节密封尺寸,并能通过设置的两个密封机构实现对异径接头的密封,结构简单,使用方便可靠,避免了钻孔流体从孔口装置与钻杆间的缝隙泄露。(the invention discloses a floating sealing device for a drill rod at an orifice, which comprises a primary sealing mechanism (1), a middle connecting flange (2), a secondary sealing mechanism (3) and a rotating part (4); the middle connecting flange (2) is an I-shaped pipe body, a primary sealing mechanism (1) is fixed on an upper flange plate of the middle connecting flange (2), a secondary sealing mechanism (3) is fixed on a lower flange plate of the middle connecting flange (2), and a rotating part (4) is fixedly connected to the lower bottom surface of the secondary sealing mechanism (3). The invention can automatically adjust the sealing size along with the diameter change of the drill rod, can realize the sealing of the reducing joint through the two arranged sealing mechanisms, has simple structure and convenient and reliable use, and avoids the leakage of drilling fluid from a gap between the orifice device and the drill rod.)

1. The orifice drill rod floating sealing device is characterized in that: comprises a primary sealing mechanism (1), a middle connecting flange (2), a secondary sealing mechanism (3) and a rotating part (4); the middle connecting flange (2) is an I-shaped pipe body, a primary sealing mechanism (1) is fixed on an upper flange plate of the middle connecting flange (2), a secondary sealing mechanism (3) is fixed on a lower flange plate of the middle connecting flange (2), and a rotating part (4) is fixedly connected to the lower bottom surface of the secondary sealing mechanism (3).

2. The floating seal for an orifice drill pipe as set forth in claim 1 wherein: the primary sealing mechanism (1) comprises a first spring seat (12), a first sealing block seat (13), a first spring group (14), a first floating sealing block group (15), a second spring group (16) and a second floating sealing block group (17); the first spring seat (12) is a circular ring base, and a first sealing block seat (13) is arranged in the first spring seat (12); the upper part and the lower part of the first sealing block seat (13) are respectively provided with guide grooves which are uniformly distributed along the circumferential direction, and the upper guide grooves and the lower guide grooves are distributed in a staggered manner; the first floating seal block group (15) is arranged in an upper guide groove of the first seal block seat (13), one end of a spring of the first spring group (14) extends into an inner hole of the first spring seat (12), and the other end of the spring compresses the outer end of the first floating seal block; the second floating seal block group (17) is arranged in the lower guide groove of the first seal block seat (13), one end of a spring of the second spring group (16) extends into the inner hole of the first spring seat (12), and the other end of the spring compresses the outer end of the second floating seal block; the top surface of the first sealing block seat (12) is fixed with the cover plate (11) by threads, and the bottom surface of the first sealing block seat (13) and the first spring seat (12) are fixed on the upper flange of the intermediate flange (6) by threads.

3. The floating seal for an orifice drill pipe as set forth in claim 2 wherein: the upper portion and the lower portion of the first sealing block seat (13) are respectively provided with 6 guide grooves along the circumferential direction, the first floating sealing block group (15) and the second floating sealing block group (17) are respectively composed of 6 sealing blocks, and the first spring group (14) and the second spring group (16) are respectively composed of 6 springs.

4. The floating seal of an orifice drill pipe as set forth in claim 3 wherein: the rotating part (4) comprises a single-action flange (41), a bearing sealing end cover (42), an upper dustproof seal (43), a bearing (44), a connecting joint (45) and a lower dustproof seal (46); the single-action flange (41) is a T-shaped pipe body, the top surface of the single-action flange is a flange plate, a bearing sealing end cover (42) and a bearing (44) are sequentially arranged on the pipe body below the flange plate of the single-action flange (41), and an upper dustproof seal (43) is arranged between the bearing sealing end cover (42) and the pipe body of the single-action flange (41); the connecting joint (45) is a stepped pipe barrel, the outer wall of the bearing (44) is embedded into a large-caliber pipe barrel at the upper part of the connecting joint (45), a lower dustproof seal (46) is arranged between the inner wall of the small-caliber pipe barrel in the middle of the connecting joint (45) and the outer wall of the pipe body of the single-action flange (41), and a thread for connecting an orifice device is arranged on the outer wall of the lower part of the connecting joint (45).

Technical Field

the invention belongs to the technical field of drilling, and particularly relates to a drill rod sealing device which is applied to drilling construction to implement drilling sealing and prevent drilling fluid from leaking from a gap between an orifice device and a drill rod.

Background

In the drilling construction, because the outer diameter of the drill rod joint is larger than that of the drill rod, and the joint is generally provided with a square notch convenient for mounting a cushion fork, at present, an effective method for realizing effective sealing between the orifice device and the drill rod is not available, drilling fluid leaks from a gap between the orifice device and the drill rod to damage the construction site environment, and drilling flushing medium collection is not facilitated, so that waste is caused.

Disclosure of Invention

aiming at the problems in the prior art, the technical problem to be solved by the invention is to provide the floating sealing device for the drill rod of the orifice, which can effectively seal the orifice device and the drill rod in the drilling process and does not influence the normal drilling operation.

The technical problem to be solved by the invention is realized by the technical scheme that the sealing device comprises a primary sealing mechanism, a middle connecting flange, a secondary sealing mechanism and a rotating part, wherein the middle connecting flange is an I-shaped pipe body, the primary sealing mechanism is fixed on an upper flange plate of the middle connecting flange, the secondary sealing mechanism is fixed on a lower flange plate of the middle connecting flange, and the rotating part is fixedly connected with the lower bottom surface of the secondary sealing mechanism.

The installation and use method of the invention comprises the following steps: the lower part of the rotating part 4 of the invention is connected with an orifice device by screw threads, and a drill rod passes through a central channel of the invention and is inserted into a drill hole; the distance between the two sealing mechanisms is greater than the length of the drill rod catcher, when the drill rod catcher enters the sealing section, only one sealing mechanism fails, and the other sealing mechanism still realizes effective sealing with the drill rod body.

The invention has the technical effects that: realize the sealed of reducing joint through two sealing mechanism, can accomplish normal drilling operation, and have simple structure, convenient to use is reliable advantage.

drawings

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

In this patent application, for the purpose of clearly describing the positional relationship of each component, the terms of orientation such as "upper" and "lower" are used, and these terms of orientation are referred to the arrangement positions of the above drawings.

As shown in fig. 1, the present invention comprises a primary sealing mechanism 1, an intermediate connecting flange 2, a secondary sealing mechanism 3 and a rotating member 4; the middle connecting flange 2 is an I-shaped pipe body, the upper flange plate of the middle connecting flange 2 is fixed with the primary sealing mechanism 1, the lower flange plate of the middle connecting flange 2 is fixed with the secondary sealing mechanism 3, and the lower bottom surface of the secondary sealing mechanism 3 is fixedly connected with the rotating part 4.

The installation and use method of the invention comprises the following steps: the lower part of the rotating part 4 is connected to the orifice device by screw threads, and a drill rod passes through the central channel of the drill rod and is inserted into a drill hole; the distance between the two sealing mechanisms is greater than the length of the drill rod catcher, when the drill rod catcher enters the sealing section, only one sealing mechanism fails, and the other sealing mechanism still realizes effective sealing with the drill rod body.

as shown in fig. 2, the primary sealing mechanism 1 includes a first spring seat 12, a first sealing block seat 13, a first spring group 14, a first floating sealing block group 15, a second spring group 16 and a second floating sealing block group 17; the first spring seat 12 is a circular ring base, and a first sealing block seat 13 is arranged in the first spring seat 12; as shown in fig. 3, the upper and lower parts of the first sealing block seat 13 are respectively provided with guide grooves uniformly distributed along the circumferential direction, and the upper guide grooves and the lower guide grooves are distributed in a staggered manner; the first floating seal block group 15 is arranged in an upper guide groove of the first seal block seat 13, one end of a spring of the first spring group 14 extends into an inner hole of the first spring seat 12, and the other end of the spring compresses the outer end of the first floating seal block; the second floating seal block group 17 is arranged in the lower guide groove of the first seal block seat 13, one end of a spring of the second spring group 16 extends into the inner hole of the first spring seat 12, and the other end of the spring compresses the outer end of the second floating seal block; the top surface of the first sealing block seat 13 is fixed with the cover plate 11 by screw threads, and the bottom surface of the first sealing block seat 13 and the first spring seat 12 are fixed on the upper flange of the middle flange 6 by screw threads.

in this embodiment, as shown in fig. 2, the upper and lower portions of the first sealing block seat 13 are uniformly provided with 6 guide grooves along the circumferential direction, the first floating sealing block group 15 and the second floating sealing block group 17 are respectively composed of 6 sealing blocks, and correspondingly, the first spring group 14 and the second spring group 16 are respectively composed of 6 springs. The staggered upper guide grooves and the staggered lower guide grooves determine that the first floating seal block group 15 and the second floating seal block group 17 implement staggered sealing along the circumference of the drill rod, so that gaps are avoided, and the sealing is tight; the sealing size of the floating seal block groups 15 and 17 can be automatically adjusted along with the diameter change of the drill rod.

The secondary sealing mechanism 3 comprises a second spring seat 31, a second sealing block seat 32, a third spring group 33, a third floating sealing block group 34, a fourth spring group 35 and a fourth floating sealing block group 36; the structure and composition of these components are the same as the primary seal mechanism 1; the top surface of the second seal block seat 32 is fixed to the lower flange of the intermediate flange 6 by screw threads, and the bottom surface of the first seal block seat 32 and the second spring seat 31 are fixed to the flange of the single acting flange 41 of the rotary member 4 by screw threads.

as shown in fig. 1, the rotating part 4 comprises a single acting flange 41, a bearing seal end cover 42, an upper dust seal 43, a bearing 44, a connecting joint 45 and a lower dust seal 46; the single acting flange 41 is a T-shaped pipe body, the top surface of the single acting flange is a flange plate, a bearing sealing end cover 42 and a bearing 44 are sequentially arranged on the pipe body below the flange plate of the single acting flange 41, and an upper dustproof seal 43 is arranged between the bearing sealing end cover 42 and the pipe body of the single acting flange 41; the connecting joint 45 is a stepped pipe barrel, the outer wall of the bearing 44 is embedded into the large-caliber pipe barrel at the upper part of the connecting joint 45, a lower dustproof seal 46 is arranged between the inner wall of the small-caliber pipe barrel in the middle of the connecting joint 45 and the outer wall of the pipe body of the single acting flange 41, and a thread for connecting an orifice device is arranged on the outer wall of the lower part of the connecting joint 45.

The upper dust seal 43 and the lower dust seal 46 perform dust seals for the bearing 44. After the drill rod is clamped by the floating seal block group of the primary seal mechanism 1 and the secondary seal mechanism 3, the drill rod rotates to drive the drill rod to rotate, and the connecting joint 45 of the rotating part 4 is used for connecting an orifice device to realize the connection of the fixing device and the rotating part.

The working principle of the invention is as follows:

The first floating seal block group 15 of the primary sealing mechanism 1 tightly holds the drill rod under the action of the first spring group 14, the second floating seal block group 17 tightly holds the drill rod under the action of the second spring group 16, primary sealing of the drill rod and the orifice device is achieved, and the sealing sizes of the floating seal block groups 15 and 17 can be automatically adjusted through the first spring group 14 and the second spring group 16 along with the change of the diameter of the drill rod.

The third floating seal block group 34 of the secondary sealing mechanism 3 tightly holds the drill rod under the action of the third spring group 33, the fourth floating seal block group 36 tightly holds the drill rod under the action of the fourth spring group 35, secondary sealing of the drill rod and the orifice device is achieved, and the sealing sizes of the floating seal block groups 34 and 36 can be automatically adjusted through the third spring group 33 and the fourth spring group 35 along with the change of the diameter of the drill rod.

during drilling, a drill rod freely moves on the central shafts of the primary sealing mechanism 1 and the secondary sealing mechanism 3, the drill rod synchronously rotates along with the drill rod under the action of sealing holding force, single-action rotation is realized through the bearing arranged on the single-action flange 41, namely the sealing mechanism rotates along with the drill rod, and the drill rod does not rotate along with the drill rod because the sealing mechanism is connected with the orifice device through the bearing. The distance between the two sealing mechanisms is greater than the length of the drill rod catcher, when the drill rod catcher enters the sealing section, only one sealing mechanism fails, and the other sealing mechanism still realizes effective sealing with the drill rod body. The invention can automatically adjust the sealing size along with the diameter change of the drill rod, can realize the sealing of the reducing joint through the two arranged sealing mechanisms, has simple structure and convenient and reliable use, and avoids the leakage of drilling fluid from a gap between the orifice device and the drill rod.