阅读说明：本技术 降扭短节及钻具组件 (Torque-reducing pup joint and drilling tool assembly ) 是由 王建利 翟光华 朱英杰 石德佩 徐丙贵 贾涛 何飞 尹洪伟 于永亮 吕明杰 杨毅 于 2019-11-07 设计创作，主要内容包括：本发明公开了一种降扭短节及钻具组件,该降扭短节包括本体,所述本体内部具有沿中心轴线贯穿的通道；和调节部,所述调节部套设在所述本体上,所述调节部的两端分别具有至少一个进口和至少一个出口,且所述调节部的内部具有至少一条调速通道,所述调速通道用于连通至少一个所述进口与至少一个所述出口；其中,钻井液从所述至少一个进口流入所述调速通道后并从所述至少一个出口流出,且所述钻井液流出所述出口的速度大于流入所述进口的速度。本发明的降扭短节通过改变调速通道连通进口与出口的数量,从而保证相同的流量的钻井液流入进口后从出口流出时具有一定的加速度,进而提高了钻井液的携屑能力,减少岩屑床的产生,最终降低钻杆的扭矩。(The invention discloses a torque reducing nipple and a drilling tool assembly, wherein the torque reducing nipple comprises a body, wherein a channel penetrating along a central axis is formed in the body; the adjusting part is sleeved on the body, two ends of the adjusting part are respectively provided with at least one inlet and at least one outlet, at least one speed regulating channel is arranged in the adjusting part, and the speed regulating channel is used for communicating the at least one inlet with the at least one outlet; and drilling fluid flows into the speed regulating channel from the at least one inlet and flows out from the at least one outlet, and the speed of the drilling fluid flowing out of the outlet is higher than that of the drilling fluid flowing into the inlet. The torque reducing nipple joint provided by the invention has the advantages that the number of the inlets and the outlets communicated through the speed regulating channel is changed, so that the drilling fluid with the same flow rate is ensured to have certain acceleration when flowing out of the outlets after flowing into the inlets, the chip carrying capacity of the drilling fluid is further improved, the generation of rock chip beds is reduced, and finally the torque of a drill rod is reduced.)

1. A torque-reducing nipple is characterized by comprising:

a body having an inner passage extending axially therethrough;

the adjusting part is sleeved on the body, two ends of the adjusting part are respectively provided with at least one inlet and at least one outlet, at least one speed regulating channel is arranged in the adjusting part, and the at least one inlet is communicated with the at least one outlet through the at least one speed regulating channel;

wherein the timing passage is configured to cause a flow rate of drilling fluid out of the at least one outlet to be greater than a flow rate of drilling fluid into the at least one inlet.

2. The torque-reducing sub according to claim 1, wherein the adjustment portion comprises:

the rotating piece is rotatably sleeved on the body, at least one rotating rib is wound on the outer surface of the rotating piece, the speed regulating channel is formed between every two adjacent rotating ribs, and the vertical projections of the two ends of each rotating rib in the cross section of the body are mutually staggered;

the safety cover, the safety cover is established on the rotating member, the both ends of safety cover respectively with form between the body at least one import with at least one export.

3. The torque-reducing sub according to claim 2, wherein at least one bearing is sleeved on each of two ends of the rotating member, one end of the at least one bearing is connected to the protective cover, and the other end of the at least one bearing is connected to the body.

4. The torque-reducing nipple according to claim 1, wherein two fixing portions are provided at an interval on the outer wall of the body, and an accommodating ring groove for accommodating the adjusting portion is formed between the two fixing portions.

5. The torque-reducing sub according to claim 4, wherein the end of the adjusting portion is engaged with the fixing portion by a thrust ring, and the thrust ring is connected to the fixing portion by a fixing pin.

6. The torque-reducing nipple according to claim 2, wherein an angle between a connecting line of two points of the two ends of the rotating rib projected on the cross section of the body and the center of the cross section is 30 °.

7. The torque-reducing sub according to claim 1, wherein the cross-sectional area of each of the speed governing passages is gradually reduced from the inlet to the outlet.

8. The torque-reducing sub according to claim 1, wherein the sum of the cross-sectional areas of the at least one inlet is greater than the sum of the cross-sectional areas of the at least one outlet.

9. The torque-reducing sub according to claim 8,

the at least one outlet comprises at least one first outlet and at least one second outlet, the cross-sectional area of the first outlet being smaller than the cross-sectional area of the second outlet;

the at least one inlet comprises at least one first inlet and at least one second inlet, the cross-sectional area of the first inlet being less than the cross-sectional area of the second inlet;

the cross-sectional area of the first outlet is less than or equal to the cross-sectional area of the first inlet.

10. A drilling tool assembly, comprising the torque reducing sub as claimed in any one of claims 1 to 9, wherein both ends of the torque reducing sub are respectively connected with a drill rod, and the inner channel of the body is communicated with the insides of the drill rods at both ends of the body.

Technical Field

The invention relates to the field of petroleum and natural gas drilling, in particular to a torque reducing nipple and a drilling tool assembly.

Background

As drilling technology advances, the demand for production increases. Horizontal wells are increasingly used in well drilling development as a stimulation, efficient drilling technique. Compared with a common vertical well, the horizontal well has the following advantages: firstly, a plurality of independent storage areas can be penetrated to achieve the production of one borehole and a plurality of storage areas; second, because only one wellbore is required for multiple production reservoirs, and multiple vertical well drills are no longer required, production costs can be greatly reduced.

However, in the drilling process of the horizontal well, please refer to fig. 1, the following problems still exist:

firstly, the sand setting of the horizontal section of the horizontal well is severe, and in the process of drilling the horizontal section of the horizontal well, the drilling fluid flows out of a drill bit connected with a drill rod 2000 along the flow direction F1 of the drilling fluid in the drill rod and then flows in the horizontal well along the flow direction F2 of the drilling fluid in the horizontal well. Due to the limited sand carrying capacity of the mud and the influence of the self weight of the drilling mud and sand, the detritus bed 4000 is formed at the bottom of the horizontal section, and the mechanical drilling speed of the drill bit is reduced along with the accumulation of the detritus bed 4000, so that the whole drilling progress is influenced. Secondly, when the horizontal section is drilled, one side of the drill rod 2000 is always attached to the well wall 3000 under the influence of gravity, and meanwhile, the drill rod 2000 rotates and pulls back and forth on the well wall 3000, so that the deposition of bottom rock debris increases along with the increase of time, the torque of the drill rod 2000 increases, the drill rod 2000 is stuck and clamped, and the drill rod 2000 is broken, so that the drilling speed and the success rate of the horizontal well are greatly influenced.

Disclosure of Invention

The invention aims to provide a torque reducing nipple and a drilling tool assembly, which are used for improving the chip carrying rate of drilling fluid, reducing the generation of rock chip beds and reducing the torque of a drill rod, and are convenient to use and quick in connection.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a torque reducing nipple which comprises a body, wherein the body is provided with an inner channel which axially penetrates through the body; the adjusting part is sleeved on the body, two ends of the adjusting part are respectively provided with at least one inlet and at least one outlet, at least one speed regulating channel is arranged in the adjusting part, and the at least one inlet is communicated with the at least one outlet through the at least one speed regulating channel; wherein the timing passage is configured to cause a flow rate of drilling fluid out of the at least one outlet to be greater than a flow rate of drilling fluid into the at least one inlet.

Preferably, the adjusting portion includes: the rotating piece is rotatably sleeved on the body, at least one rotating rib is wound on the outer surface of the rotating piece, the speed regulating channel is formed between every two adjacent rotating ribs, and the vertical projections of the two ends of each rotating rib in the cross section of the body are mutually staggered; the safety cover, the safety cover is established on the rotating member, the both ends of safety cover respectively with form between the body at least one import with at least one export.

Preferably, at least one bearing is respectively sleeved at two ends of the rotating member, one end of the at least one bearing is connected with the protective cover, and the other end of the at least one bearing is connected with the body.

Preferably, the outer wall of the body is provided with two fixing parts at intervals, and an accommodating ring groove for accommodating the adjusting part is formed between the two fixing parts.

Preferably, an end of the adjusting portion is clamped to the fixing portion by a thrust ring, and the thrust ring is connected to the fixing portion by a fixing pin.

Preferably, an included angle between a connecting line of two points of two ends of the rotating rib projected on the cross section of the body and the center of the cross section is 30 °.

Preferably, the cross-sectional area of each of the speed governing passages is gradually reduced from the inlet to the outlet.

Preferably, the sum of the cross-sectional areas of the at least one inlet is greater than the sum of the cross-sectional areas of the at least one outlet.

Preferably, wherein the at least one outlet comprises at least one first outlet and at least one second outlet, the cross-sectional area of the first outlet being smaller than the cross-sectional area of the second outlet; the at least one inlet comprises at least one first inlet and at least one second inlet, the cross-sectional area of the first inlet being less than the cross-sectional area of the second inlet; the cross-sectional area of the first outlet is less than or equal to the cross-sectional area of the first inlet.

The invention also provides a drilling tool assembly, which comprises the torque reducing nipple, wherein two ends of the torque reducing nipple are respectively connected with the drill rods, and the inner channel of the body is communicated with the interiors of the drill rods positioned at the two ends of the body.

The invention has the characteristics and advantages that: the flow velocity of the drilling fluid flowing out of the at least one outlet is larger than the flow velocity of the drilling fluid flowing into the at least one inlet through the speed regulating channel, so that the function of increasing the flow velocity of the drilling fluid is realized, the chip carrying rate of the drilling fluid is increased, and the effect of reducing the torque of the drill rod is further achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a drill rod in a horizontal well in the prior art;

FIG. 2 is a schematic half-section view of the torque reducing nipple of the present invention;

FIG. 3 is a first perspective view of the torque reducing pipe nipple of the present invention;

FIG. 4 is a second perspective view of the torque reducing pipe nipple of the present invention;

FIG. 5 is a third perspective view of the torque reducing pipe nipple of the present invention;

FIG. 6 is a fourth perspective view of the torque reducing pipe nipple of the present invention;

FIG. 7 is a fifth perspective view of the torque reducing pipe nipple of the present invention;

FIG. 8 is a sixth perspective view of the torque reducing pipe nipple of the present invention;

FIG. 9 is a seventh perspective view of the torque reducing pipe nipple of the present invention;

FIG. 10 is a schematic half-section view of a torque reducing nipple of the present invention;

FIG. 11 is a schematic view of the use of the drill assembly of the present invention in a horizontal well.

Description of reference numerals:

1000. a torque reducing nipple; 100. A body;

110. an inner channel; 120. A cross-section of the body;

200. an adjustment section; 210. An inlet;

211. a first inlet; 212. A second inlet;

220. an outlet; 221. A first outlet;

222. a second outlet; 230. A speed regulating channel;

240. a rotating member; 241. Rotating the ribs;

250. a protective cover; 300. A bearing;

400. a fixed part; 410. A receiving ring groove;

420. a thrust ring; 430. Fixing the pin;

440. a boss portion; 2000. A drill stem;

3000. a well wall; 4000. A bed of rock debris.

A. Rotating one end of the rib; b. Rotating the other end of the rib;

a', projecting one end of the rotating rib; b', projecting the other end of the rotating rib;

f1, the flow direction of the drilling fluid in the drill pipe; f2, the flow direction of the drilling fluid in the horizontal well;

alpha, an included angle; theta, included angle.

Detailed Description

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 given herein without making any creative effort, shall fall within the protection scope of the present invention.

Implementation mode one

The invention provides a torque reducing short joint 1000 which comprises a body 100 and an adjusting part 200.

Specifically, referring to fig. 2, the body 100 has an inner passage 110 extending axially therethrough; the adjusting part 200 is sleeved on the body 100, two ends of the adjusting part 200 are respectively provided with at least one inlet 210 and at least one outlet 220, the adjusting part 200 is internally provided with at least one speed regulating channel 230, and the at least one inlet 210 is communicated with the at least one outlet 220 through the at least one speed regulating channel 230; wherein the timing passage 230 enables a greater flow rate of drilling fluid out of the at least one outlet 220 than into the at least one inlet 210.

According to the torque-reducing nipple 1000 provided by the invention, the flow speed of the drilling fluid is adjusted to the speed meeting the use requirement by using the speed adjusting channel 230, so that the debris bed 4000 around the drill rod 2000 connected with the drilling fluid is washed by using the outflow speed of the drilling fluid after the speed is adjusted, more debris and the drilling fluid are further mixed together, and the debris carrying rate of the drilling fluid is improved; meanwhile, due to the fact that the drilling fluid erodes the detritus bed 4000, accumulation of detritus on the detritus bed 4000 is avoided, generation of the subsequent detritus bed 4000 is further reduced, sticking and clamping of the drill rod 2000 are avoided, torque of the drill rod 2000 is finally reduced, and the situation that the drill rod 2000 breaks due to torque increase is avoided.

It should be understood by those skilled in the art that the drilling fluid in the present invention is a generic term for various circulating fluids that serve their various functions in the drilling process to meet the needs of the drilling operation. The drilling fluid may be clear water, mud, clay-free flushing fluid, emulsion, foam, compressed air, etc. In areas with intact rock strata and sufficient water sources, the drilling fluid can be clear water, so that the drilling fluid does not need to be further treated, and the use is convenient and quick. In other embodiments of unstable formations that are open, fissured, prone to collapse and spall, and that swell with water, the drilling fluid may use a mud. The type and composition of the drilling fluid should be determined according to specific construction conditions, and it is within the scope of the present invention to use the drilling fluid with a certain velocity to flush the cuttings bed 4000 to reduce the torque applied by the cuttings bed 4000 to the drill pipe 2000.

In some embodiments, the adjustment portion 200 includes a rotating member 240 and a protective cover 250.

Specifically, referring to fig. 2 and fig. 3, the rotating member 240 is rotatably sleeved on the body 100, at least one rotating rib 241 is wound on the outer surface of the rotating member 240, a speed adjusting channel 230 is formed between every two adjacent rotating ribs 241, and the vertical projections of the two ends of each rotating rib 241 in the cross section 120 of the body are mutually staggered; the protective cover 250 is disposed on the rotating member 240, and at least one inlet 210 and at least one outlet 220 are formed between two ends of the protective cover 250 and the body 100.

In some embodiments, after the protective cover 250 is sleeved on the body 100, a gap with a certain distance exists between each rotating rib 241 and the protective cover 250, so that the plurality of speed adjusting channels 230 can be communicated with each other to form an integral speed adjusting pipeline, that is, the rotating member 240 is located in the integral speed adjusting pipeline, and the drilling fluid flows into the integral speed adjusting pipeline through the plurality of inlets 210TheThe integral timing duct then rotates the rotary member 240, thereby generating a vortex flow in the integral timing duct, and finally flowing out of the at least one outlet 220 at a certain speed. In other embodiments, the plurality of speed adjusting channels 230 are independent from each other, that is, after the protective cover 250 is sleeved on the body 100, a closed cavity is formed between each two of the rotating ribs 241 and the protective cover 250, and the cavity is a speed adjusting channel to be respectively communicated with the at least one inlet 210 and the at least one outlet 220, by adopting this way, the drilling fluid is converged into each speed adjusting channel 230 and pushes the rotating member 240 to rotate, so that the centrifugal force generated by the rotation of the rotating member 240 is utilized to accelerate the drilling fluid, and the drilling fluid further flows out from the at least one outlet 220 at a certain speed.

Referring to fig. 4, the vertical projections of the two ends of each rotating rib 241 in the cross section 120 of the body are staggered from each other: one end a of the rotating rib has a projection a 'in the cross section 120 of the body along the central axis direction, and the other end B of the rotating rib has a projection B' in the cross section 120 of the body along the central axis direction, the projection a 'and the projection B' being staggered and not overlapped with each other in the cross section 120 of the body. Those skilled in the art will appreciate that the cross-section 120 of the body refers to a plane in which the cross-section 120 of the body lies.

Specifically, referring to fig. 5, the two ends (i.e., a and B in fig. 4) of the rotating rib 241 are projected to two points (a 'and B') on the cross section 120 of the body, and the included angle θ between the connecting line of the centers of the cross section is 30 °. Thereby can guarantee that the speed of the drilling fluid that flows out export 220 satisfies the operation requirement, further assurance drilling fluid take bits rate and satisfy the operation requirement, finally can be timely effectual reduction drilling rod 2000's moment of torsion.

It should be understood by those skilled in the art that the speed regulating channel 230 is formed between every two adjacent rotating ribs 241, the speed regulating channel 230 changes a straight line channel between the inlet 210 and the outlet 220 into a curved channel, so that the inflow speed of the drilling fluid can be used for driving the rotating member 240 to rotate, the speed of the drilling fluid is increased, the speed of the drilling fluid flowing out of the outlet 220 is further ensured to be greater than the speed of the drilling fluid flowing into the inlet 210, finally, rock debris on the rock debris bed 4000 can be washed away, the debris carrying rate of the drilling fluid is increased, the generation of the rock debris bed 4000 is reduced, and the torque of the drill rod 2000 is further reduced.

Of course, the rotating member 240 may also be fixedly sleeved on the body 100, so that the drilling fluid rotates around the rotating rib 241, the outflow speed of the drilling fluid is further increased, the chip carrying rate of the drilling fluid is improved, and finally the torque of the drill rod 2000 is reduced.

In some embodiments, referring to fig. 6, the at least one inlet 210 and the at least one outlet 220 are formed between the two ends of the protective cover 250 and the body 100, respectively, that is, the at least one inlet 210 and the at least one outlet 220 are formed at the two ends of the protective cover 250, respectively. It should be understood by those skilled in the art that in order to ensure that the drilling fluid can smoothly flow into the inlet 210 and out of the outlet 220, the opening surfaces of the plurality of inlets 210 and the plurality of outlets 220 have an included angle α with the flowing direction of the drilling fluid in the horizontal well, and the purpose of setting the included angle α is within the protection scope of the present invention without limitation to the specific angle of the included angle α. The design mode that the protective cover 250 is provided with the inlet 210 and the outlet 220 is adopted, so that the protective cover 250 can be integrally processed conveniently, the stress is more uniform and stable, and the assembly is simple and quick.

In other embodiments, referring to fig. 7, at least one inlet 210 and at least one outlet 220 are formed between two ends of the protective cover 250 and the body 100, respectively, which means that two ends of the protective cover 250 and the body 100 enclose the at least one inlet 210 and the at least one outlet 220, respectively. By adopting the design, the processing parts are simple, and only damaged parts need to be replaced during later maintenance, so that the cost is saved, and the market competitiveness is improved.

In the present invention, referring to fig. 2 to 4, 6, 7, 10 and 11, at least one bearing 300 is respectively sleeved at two ends of the rotating member 240, one end of the at least one bearing 300 is connected to the protecting cover 250, and the other end of the at least one bearing 300 is connected to the body 100.

The torque reducing nipple 1000 provided by the invention realizes the rotation function between the rotating member 240 and the body 100 through the bearing 300, on one hand, the friction force of the rotation of the bearing 300 is small, and more kinetic energy of drilling fluid can be converted into the driving force of the rotating member 240, so that the rotating speed of the rotating member 240 can meet the use requirement, the speed of the drilling fluid can be further increased to the speed required by use, and meanwhile, the waste and consumption of the kinetic energy are avoided; on the other hand, the structure of the product can be more compact by using the bearing 300, so that the space volume of the product is reduced, and the bearing is more suitable for drilling a horizontal well.

In some embodiments, two fixing portions 400 are spaced apart from each other on the outer wall of the body 100, and a receiving groove 410 for receiving the adjusting portion 200 is formed between the two fixing portions 400. The fixing portion 400 may be a circular rib formed on the body 100, or may be integrally formed on the outer surface of the body 100, which is not limited herein.

Specifically, referring to fig. 8, two fixing portions 400 are sleeved with thrust rings 420, an end portion of the adjusting portion 200 is clamped to the fixing portions 400 through the thrust rings 420, and the thrust rings 420 are connected to the fixing portions 400 through a plurality of fixing pins 430 arranged at intervals along the circumferential direction. Adopt thrust collar 420 and fixed pin 430 complex form, connect stably, can prevent that the part from droing, can in time change wearing and tearing spare part according to the in service behavior simultaneously, the later maintenance of being convenient for reduces the maintenance cost of product.

In other embodiments, referring to fig. 9, a thrust ring 420 is sleeved on one of the two fixing portions 400, the thrust ring 420 is connected to the fixing portion 400 by a plurality of fixing pins 430 arranged at intervals along the circumferential direction, and the other fixing portion 400 is formed as a protrusion 440. The adjustment part 200 is clamped between the thrust ring 420 and the protrusion 440. By adopting the design mode, on one hand, the installation time of the thrust ring 420 is saved, and meanwhile, the lug boss 440 can be used as an installation mark, so that the installation position can be found more quickly, the installation time is further saved, and the installation efficiency is improved.

The installation process of the invention is as follows: firstly, the rotating member 240 is sleeved on the body 100, then the first bearing 300, the protective cover 250 and the second bearing 300 are sequentially installed, finally, the thrust collar 420 is connected with the fixing part 400 on the body 100 through threads, the fixing pin 430 is installed on the thrust collar 420 to serve as thread anti-loosening reserve, and finally, installation is completed.

In accordance with one embodiment of the present invention, referring to FIG. 10, the cross-sectional area of each speed channel 230 is tapered from the inlet 210 to the outlet 220. By adopting the design mode of changing the cross-sectional area of the speed regulating channel 230, more drilling fluid can be collected and discharged through the outlet 220 in unit time, so that the flowing speed of the drilling fluid from the outlet 220 is increased, the cuttings carrying rate of the drilling fluid is further increased, and finally the torque of the drill rod 2000 is reduced.

In another embodiment, the sum of the cross-sectional areas of the at least one inlet 210 is greater than the sum of the cross-sectional areas of the at least one outlet 220.

In some embodiments, referring to fig. 6, a plurality of inlets 210 and a plurality of outlets 220 are respectively formed between both ends of the protective cover 250 and the body 100. Wherein the cross-sectional areas of the inlets 210 are the same and the cross-sectional areas of the outlets 220 are the same, but the sum of the cross-sectional areas of all the inlets 210 is greater than the sum of the cross-sectional areas of all the outlets 220.

Because the sum of the cross-sectional areas of all the inlets 210 is larger than the sum of the cross-sectional areas of all the outlets 220, an area difference exists between the inlets 210 and the outlets 220, and the area difference can be used for increasing the speed of the drilling fluid flowing out of the outlets 220, so that the speed of the drilling fluid meets the use requirement, and the cuttings carrying rate of the drilling fluid is further increased.

In other embodiments, specifically, referring to fig. 7, the at least one outlet 220 includes at least one first outlet 221 and at least one second outlet 222, the cross-sectional area of the first outlet 221 being smaller than the cross-sectional area of the second outlet 222; the at least one inlet 210 comprises at least one first inlet 211 and at least one second inlet 212, the first inlet 211 having a cross-sectional area smaller than the cross-sectional area of the second inlet 212; wherein the cross-sectional area of the first outlet 221 is less than or equal to the cross-sectional area of the first inlet 211. That is, the cross-sectional areas of the plurality of outlets 220 are different from each other, the first outlet 221 is the smallest cross-sectional area of the plurality of outlets 220, the cross-sectional areas of the plurality of inlets 210 are different from each other, the first inlet 211 is the smallest cross-sectional area of the plurality of inlets 210, and the cross-sectional area of the first outlet 221 is smaller than or equal to the cross-sectional area of the first inlet 211, that is, the sum of the cross-sectional areas of all the inlets 210 is greater than the sum of the cross-sectional areas of all the outlets 220.

Those skilled in the art should understand that in some embodiments, the cross-sectional shape of the outlet 220 and/or the inlet 210 is a circle, and the circle can ensure that the stress transmission of the short joint is more uniform and stable, and avoid the occurrence of stress concentration; in other embodiments, the cross-sectional shape of the outlet 220 and/or the inlet 210 may be rectangular, thereby reducing the structural weight of the sub while avoiding debris having irregular shapes and/or different outer diameter sizes from blocking the inlet 210 and/or the outlet 220 of the speed adjusting passage 230. Of course, the cross-sectional shape of the outlet 220 and/or the inlet 210 may be any other shape, and will not be described herein.

On one hand, the torque reducing nipple 1000 provided by the invention can adjust the outflow speed of the drilling fluid by utilizing the area difference between all inlets 210 and all outlets 220, thereby increasing the chip carrying rate of the drilling fluid and further reducing the drill rod2000 torque; on the other hand, the inlet 210 and the outlet 220 with different cross-sectional areas and/or shapes can prevent the situation that the speed regulating channel 230 is blocked when large rock debris in the drilling fluid flows in from the inlet 210. When the cross section is smallerSpeed regulating channel 230After being blocked up, the sum of the cross-sectional areas of all inlets 210 diminishes, so the difference between the cross-sectional areas of all inlets 210 and all outlets 220 diminishes, namely the flow of drilling fluid flowing into at least one inlet 210 is reduced, the driving force of the rotating piece 240 is further reduced, and then the drilling fluid speed flowing out of the outlets 220 can be automatically adjusted, so that the chip carrying rate of the drilling fluid is adjusted, the normal operation of products is ensured, and the function of reducing the torque of the drill rod 2000 is realized.

The working principle of the invention is as follows: in the normal drilling process, the torque reducing sub 1000 and the common drilling assembly are put into the well together, drilling fluid enters the interior through the at least one inlet 210 on the protective cover 250, so that the rotating member 240 in the interior is driven to rotate, the rotating member 240 rotates to improve the rotating speed and the flow rate of the drilling fluid, and then the drilling fluid flows out along the at least one outlet 220 of the protective cover 250. The drilling fluid with the increased rotating speed and flow rate improves the carrying capacity of rock debris, reduces the formation of a rock debris bed 4000, further reduces the damage of stuck drill, and improves the mechanical drilling speed of a drilling tool, thereby improving the drilling efficiency.

Second embodiment

The invention further provides a drilling tool assembly, please refer to fig. 11, which specifically includes the torque reducing sub 1000 described in the first embodiment. Wherein, the two ends of the torque reducing short section 1000 are respectively connected with a drill rod 2000, and the inner channel 110 of the body 100 is communicated with the interior of the drill rod 2000 at the two ends.

The specific structure, operation principle and beneficial effects of the torque reducing nipple 1000 are the same as those of the first embodiment, and are not described herein again.

The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.