阅读说明：本技术 一种用于软硬不均砂土层钻进的自调式双管钻具 (Self-adjusting double-pipe drilling tool for drilling in soft and hard uneven sandy soil layer ) 是由 董崇泽 孙智杰 于 2019-10-24 设计创作，主要内容包括：一种用于软硬不均砂土层钻进的自调式双管钻具,属于钻井设备技术领域,解决现有钻具无法根据钻进砂土层的软硬度,在孔底实现自动调节超前量和单动、双动两种工况的技术问题。本装置包括内管和外管,内管的首端套装于外管中,内管的尾端延伸至外管的外部,内管与外管的尾端分别设置有钻头；变径接头与外管的首端螺纹连接,外管管腔内的首端设置有分动轴承座,分动轴承座上安装有长度调节杆；内管接头首端的端面上设置有弹簧座,弹簧座与分动轴承座之间的长度调节杆上设置有弹簧,内管接头尾端的端面上设置有限位端盖,内管的首端与限位端盖固定连接。本装置实现了单动双管与双动双管在孔内的自动转换,设计新颖、制作简单、实用性强。(A self-adjusting double-pipe drilling tool for drilling in a sandy soil layer with uneven hardness belongs to the technical field of drilling equipment and solves the technical problem that an existing drilling tool cannot automatically adjust advance and single-action and double-action working conditions at the bottom of a hole according to the hardness of the drilled sandy soil layer. The device comprises an inner tube and an outer tube, wherein the head end of the inner tube is sleeved in the outer tube, the tail end of the inner tube extends to the outside of the outer tube, and drill bits are respectively arranged at the tail ends of the inner tube and the outer tube; the reducer union is in threaded connection with the head end of the outer pipe, a transfer bearing seat is arranged at the head end in the pipe cavity of the outer pipe, and a length adjusting rod is arranged on the transfer bearing seat; the end face of the head end of the inner pipe joint is provided with a spring seat, a spring is arranged on a length adjusting rod between the spring seat and the transfer bearing seat, a limiting end cover is arranged on the end face of the tail end of the inner pipe joint, and the head end of the inner pipe is fixedly connected with the limiting end cover. The device realizes the automatic conversion of the single-acting double-tube and the double-acting double-tube in the hole, and has novel design, simple manufacture and strong practicability.)

1. The utility model provides a from mode double-barrelled drilling tool that is used for soft uneven sand layer to creep into, it includes inner tube (8), outer tube (9) and reducer union (1), its characterized in that: the reducer union (1) is fixedly connected with the head end of the outer pipe (9), a transfer bearing seat (2) is arranged at the head end in the pipe cavity of the outer pipe (9), a length adjusting rod (4) is mounted on the transfer bearing seat (2), the length adjusting rod (4) is arranged to be an outer hexagonal rod, and the tail end of the outer pipe (9) is in threaded connection with an outer pipe drill bit (10); the head end of the inner pipe (8) is sleeved in the outer pipe (9), the tail end of the inner pipe (8) extends to the outside of the outer pipe (9), and the tail end of the inner pipe (8) is in threaded connection with the inner pipe drill bit (11); the head end of inner tube connects (6) is provided with the hexagon socket head cap groove, the hexagon socket head cap groove with the outer hexagonal pole that sets up on length adjustment pole (4) cooperatees, and outer hexagonal pole detachably cartridge is provided with spring holder (5) on the terminal surface of inner tube connects (6) head end, is provided with spring (3) on length adjustment pole (4) between spring holder (5) and transfer bearing frame (2), is provided with spacing end cover (7) on the terminal surface of inner tube connects (6) tail end, the head end and spacing end cover (7) fixed connection of inner tube (8).

2. The self-adjusting double-pipe drilling tool for drilling in sandy soil with hardness and irregularity as claimed in claim 1, wherein the compression stroke of the spring (3) is 10 ~ 15 mm.

3. The self-adjusting double-pipe drilling tool for drilling in the sandy soil layer with uneven hardness as claimed in claim 3, wherein: the spring (3) is a single-circle thick-wire spiral spring or a double-circle thin-wire concentric spiral spring; the rigidity of the spring (3) is selected according to the hardness of the sand layer and the specification of the drill bit, and the rigidity of the spring is 50-100N/mm.

4. The self-adjusting double-pipe drilling tool for drilling in sandy soil with hardness and irregularity according to claim 1, wherein the length of the inner pipe drill bit (11) extending to the outside of the outer pipe drill bit (10) is 20 ~ 25 mm.

Technical Field

The invention belongs to the technical field of drilling equipment, and particularly relates to a self-adjusting double-pipe drilling tool for drilling in a sandy soil layer with uneven hardness.

Background

For core drilling in sandy soil, the drill is advanced for 2-3m in the second time. The quality of coring depends on the adjustment of ground drilling parameters (bit pressure, rotating speed and pump amount) and bottom hole drilling parameters (inner bit advance amount, inner and outer bit single and double actions), wherein the ground drilling parameters can be adjusted at any time according to the stratum condition when drilling, but the parameters of the drilling tool in the hole cannot be adjusted at any time, and the drilling tool needs to be lifted to the ground for adjustment.

Disclosure of Invention

The invention provides a self-adjusting double-pipe drilling tool for drilling in a sandy soil layer with uneven hardness, aiming at overcoming the defects in the prior art and solving the technical problem that the prior drilling tool cannot automatically adjust the advance according to the hardness of the sandy soil layer to be drilled.

The design concept of the invention is as follows:

1. the length adjusting rod and the inner pipe joint are additionally provided with the spring and the transfer bearing, so that the spiral spring can normally work under two working conditions of rotation and non-rotation of the inner pipe, the inner pipe and the inner pipe drill bit are pushed to 'eat' into a sand layer, and the soft soil layer is prevented from being washed away by slurry flow.

2. And the structure of the inner pipe length-adjusting rod and the inner pipe joint is innovatively designed. The hexagonal male-female transmission assembly is added, two drilling working conditions of double-tube single-action and double-tube double-action under specific conditions can be realized, and the specific conditions are as follows: when the sand layer is harder, the double pipes can be driven by double action, and when the sand layer is softer, the double pipes can be driven by single action.

3. The inner drill bit and the outer drill bit adopt a split design scheme, the lead amount of the inner drill bit is 20 ~ 25mm, and the flushing, slag discharging, lubricating and cooling of the inner drill bit and the outer drill bit can meet the drilling requirement within the range.

4. The 'advance amount' of the inner drill bit and the 'automatic adjustment' principle of the 'single and double action' of the inner and outer drill bits in the drilling process are as follows: when the sandy soil layer is softer, the spiral spring is fully extended, the inner pipe and the drill bit are pushed into the stratum, the advance amount is near a high limit position, the hexagonal male and female transmission assemblies are separated, and the double-pipe single-action drilling tool meets the drilling and coring requirements of the soft soil layer; when the sand layer is hard, the spiral spring is compressed by 10-15mm, the advance amount is near the low limit position, the male and female transmission assemblies are meshed, and the double-tube double-acting drilling tool is adopted, so that the drilling and coring requirements of the hard sand gravel layer are met.

5. And selecting the spring according to the hardness difference of the sand layer. The following steps can be selected: the stiffness of the single-turn thick-wire coil spring or the double-turn thin-wire concentric coil spring can be 50-100N/mm. .

The invention is realized by the following technical scheme.

A self-adjusting double-pipe drilling tool for drilling in a soft and hard uneven sandy soil layer comprises an inner pipe, an outer pipe and a reducer union, wherein: the reducing joint is fixedly connected with the head end of the outer pipe, a transfer bearing seat is arranged at the head end in the pipe cavity of the outer pipe, a length adjusting rod is arranged on the transfer bearing seat, the length adjusting rod is an outer hexagonal rod, and the tail end of the outer pipe is in threaded connection with an outer pipe drill bit; the head end of the inner pipe is sleeved in the outer pipe, the tail end of the inner pipe extends to the outside of the outer pipe, and the tail end of the inner pipe is in threaded connection with the inner pipe drill bit; the head end of inner tube connects is provided with the hexagon socket head cap groove, the hexagon socket head cap groove with the outer hexagonal pole that sets up on the length adjustment pole cooperatees, and outer hexagonal pole detachably cartridge is provided with the spring holder on the terminal surface of inner tube connects head end in the hexagon socket head cap groove, is provided with the spring on the length adjustment pole between spring holder and the transfer bearing frame, is provided with spacing end cover on the terminal surface of inner tube connects the tail end, the head end and the spacing end cover fixed connection of inner tube.

Further, the compression stroke of the spring is 10 ~ 15 mm.

Further, the spring is a single-turn thick-wire spiral spring or a double-turn thin-wire concentric spiral spring; the rigidity of the spring is selected according to the parameters of the sand layer hardness, the inner drill bit bottom lip surface structure, the size and the like, and the rigidity of the spring is 50-100N/mm.

Further, the length of the inner tube extending to the outside of the outer tube was 20 ~ 25 mm.

The invention has the following beneficial effects:

1. the device is used for the construction of a pilot hole of a loose sand layer full-hole coring drilling project, the design hole depth is 800m, and the actual final hole depth is 870 m. In the drilling process, the automatic conversion of two drilling working conditions of single-acting double-pipe and double-acting double-pipe in the hole is realized through improvement and adjustment, the technical blank that the conversion of a conventional drilling tool in the hole cannot be realized is filled, and the method has certain popularization and use values.

2. The tool is novel in design, simple to manufacture and high in practicability, and can be applied to sand layer coring exploration projects. The project implemented at present has two deep holes, the design hole depth is 2000m and 3000m respectively, and the cost of drilling construction cutting block is about 600 ten thousand yuan. The drilling tool and the process are matched with other drilling processes, the geological design requirements can be met, and the win-win effect is achieved in the aspects of technical innovation and economic benefit.

Drawings

Fig. 1 is a schematic view of the main cross-sectional structure of the present invention.

In the figure: 1 is the reducing joint, 2 is the transfer bearing frame, 3 is the spring, 4 is the length adjustment pole, 5 is the spring holder, 6 is the inner tube joint, 7 is spacing end cover, 8 is the inner tube, 9 is the outer tube, 10 is the outer tube drill bit, 11 is the inner tube drill bit.

Detailed Description

The invention is described in further detail below with reference to the figures and examples.

As shown in fig. 1, the self-adjusting double-pipe drilling tool for drilling in sandy soil with uneven hardness comprises an inner pipe 8, an outer pipe 9 and a reducer union 1, wherein: the reducer union 1 is fixedly connected with the head end of the outer pipe 9, a transfer bearing seat 2 is arranged at the head end in the pipe cavity of the outer pipe 9, a length adjusting rod 4 is installed on the transfer bearing seat 2, the length adjusting rod 4 is arranged as an outer hexagonal rod, and the tail end of the outer pipe 9 is in threaded connection with an outer pipe drill bit 10; the head end of the inner pipe 8 is sleeved in the outer pipe 9, the tail end of the inner pipe 8 extends to the outside of the outer pipe 9, and the tail end of the inner pipe 8 is in threaded connection with the inner pipe drill bit 11; the head end of inner tube connects 6 is provided with the hexagon socket head cap groove, the hexagon socket head cap groove with the outer hexagonal pole that sets up on the length adjustment pole 4 cooperatees, and outer hexagonal pole detachably cartridge is provided with spring holder 5 in the hexagon socket head cap groove on the terminal surface of 6 head ends of inner tube connects, is provided with spring 3 on the length adjustment pole 4 between spring holder 5 and the transfer bearing frame 2, is provided with spacing end cover 7 on the terminal surface of 6 tail ends of inner tube connects, the head end and the 7 fixed connection of spacing end cover of inner tube 8.

Further, the compression stroke of the spring 3 is 10 ~ 15 mm.

Further, the spring 3 is a single-turn thick-wire coil spring or a double-turn thin-wire concentric coil spring; the rigidity of the spring is selected according to the parameters of the sand layer hardness, the structure and the size of the bottom lip surface of the drill bit and the like, and the rigidity of the common spring can be 50-100N/mm.

Further, the length of the inner tube 8 extending to the outside of the outer tube 9 is 20 ~ 25 mm.

The key points of the invention are as follows:

1. before the drilling is carried out at every time, the male and female transmission assemblies and the inner pipe joint are carefully checked and cleaned to slide axially, so that the 'action' of the inner pipe connecting assembly is flexible and reliable, and different drilling working conditions can be timely entered according to the hardness change of a sand layer.

2. Drilling procedure parameters are adjusted according to drilling timeliness and repeated coring effect. The drilling is required to be uniform, and the parameter adjustment requirement is stable and excessive.

3. After each drill bit is lifted again, the abrasion condition of the inner drill bit and the abrasion condition of the outer drill bit and the distribution condition of flushing liquid flow are carefully checked, and problems are found and improved in time.

4. In normal drilling, a sand layer becomes hard, when the bit pressure is increased, the separation and engagement conditions of the male and female transmission assemblies are noticed, and if the conditions are abnormal, the reason is analyzed and solved after the drilling tool is lifted.

5. If the sandy soil layer is hard, the compression amount of the spring is still insufficient after the bit pressure is increased, the working condition of double-tube double-acting is not completed, and the problem can be solved by reducing the overall rigidity of the spring group.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and the technical solutions of the embodiment are equally replaced by one or more technical parameters to form a new technical solution, which is also within the scope of the present invention; it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.