CN215595519U

CN215595519U - Low-fault circulation system for drilling fluid

Info

Publication number: CN215595519U
Application number: CN202121637046.6U
Authority: CN
Inventors: 郭俊平; 潘必耀; 郑雪坤; 高黎; 丁科艳; 吴德庆; 彭光杰; 潘俊青; 张建军
Original assignee: Sinopec Oilfield Service Corp; Sinopec East China Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec East China Petroleum Engineering Corp
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-01-21
Anticipated expiration: 2031-07-19

Abstract

The utility model relates to a low-fault circulation system for drilling fluid, wherein a half-seal, a full-seal and an annular blowout preventer are sequentially arranged above a wellhead four-way joint, the top of the annular blowout preventer is connected with an anti-overflow pipe, the top of the anti-overflow pipe is connected with a mud umbrella, the side wall of the upper part of the anti-overflow pipe is welded with a U-shaped groove, the end plate at the tail end of the U-shaped groove is welded with a U-shaped groove elbow, the outlet of the U-shaped groove elbow is inserted into a mud funnel, the outlet of the slurry funnel is connected with a slurry guide pipe, the outlet elbow of the slurry guide pipe is downwards inserted into the slurry distribution groove, the side wall of the slurry distribution groove is provided with at least two slurry distribution valves, the outlet of each slurry distribution valve is respectively connected with a vibrating screen inlet elbow, each vibrating screen inlet elbow is respectively provided with a buffer, each buffer is respectively positioned above the screen cloth of the vibrating screen, each vibrating screen is respectively fixed above the slurry tank, and the slurry outlet of each vibrating screen respectively enters the slurry tank. The system not only meets the requirement of high-speed drilling, but also can reduce the failure rate and the production cost.

Description

Low-fault circulation system for drilling fluid

Technical Field

The utility model relates to a drilling device, in particular to a low-fault circulation system for drilling fluid, and belongs to the technical field of petroleum drilling.

Background

Under the influence of the international petroleum large environment, various large petroleum drilling companies adopt various methods to improve the mechanical drilling speed and shorten the drilling period, thereby reducing the cost and improving the economic benefit. The adoption of large-displacement and high-speed drilling has achieved remarkable effect in the oil area. The mechanical drilling speed is improved in a leap mode, and meanwhile a series of problems are brought.

Due to the fact that the discharge capacity of the mud pump is large, the mechanical drilling speed of the drill bit is high, the sand content of drilling fluid is high, large gravel is carried, and the large gravel directly scours the screen cloth of the vibrating screen along with mud, and the screen cloth is damaged greatly. The discharge capacity of the drilling fluid reaches above 60L/min, for example, NPI-G05(GB) wells, 47 pieces of screen cloth are damaged on average per month for a single well, the screen cloth consumption of the single well is about 16.8 ten thousand yuan per month, the economic benefit is greatly influenced, the maintenance workload is increased, and the production efficiency is influenced. Therefore, how to maintain a high drilling speed and reduce the damage rate of the screen cloth becomes a key problem.

The mud umbrella is arranged on the wellhead anti-overflow pipe, is of a reverse umbrella-shaped structure, is fixed at the lower part of a drill floor turntable gap, and is used for receiving mud to prevent the anti-overflow pipe and the drill floor mud from falling to the ground and polluting equipment. The traditional method is that an anti-overflow pipe passes through the center of a mud umbrella, and a transverse overflow pipe is connected above the mud umbrella, so that the whole mud umbrella is heavy, and the whole mud umbrella is about 300 kg. The installation is difficult, and the dismouting once needs more than 3 hours, needs 4 to 6 people to cooperate the installation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems in the prior art and provide a low-fault drilling fluid circulating system, which not only ensures the large flow of drilling fluid and meets the requirement of high-speed drilling, but also can reduce the fault rate, improve the production efficiency and reduce the production cost.

In order to solve the technical problems, the low-fault circulation system for the drilling fluid comprises a drilling fluid circulation pump connected with a mud tank, wherein the outlet of the drilling fluid circulation pump is connected with a vertical pipe through an underground pipeline, the vertical pipe is connected with a top drive gooseneck through a water hose, the top drive gooseneck is installed at the top of a drill rod, the drill rod penetrates through a sleeve and extends downwards, a wellhead cross is installed at the top of the sleeve, a half-seal blowout preventer, a full-seal blowout preventer and an annular blowout preventer are sequentially installed above the wellhead cross, the top of the annular blowout preventer is connected with an upward extending anti-overflow pipe, the top of the anti-overflow pipe is connected with a mud umbrella, the mud umbrella is positioned below a drilling platform, a U-shaped groove with an opening at the upper end is welded on the side wall of the upper part of the anti-overflow pipe, a U-shaped groove elbow is welded on an end plate at the tail end of the U-shaped groove, and the outlet of the U-shaped groove elbow is inserted into a mud funnel, the outlet of the mud funnel is connected with a mud flow guide pipe, the outlet elbow of the mud flow guide pipe is downwards inserted into a mud distribution groove, the side wall of the mud distribution groove is provided with at least two mud distribution valves, the outlet of each mud distribution valve is respectively connected with a vibrating screen inlet elbow, each vibrating screen inlet elbow is respectively provided with a buffer, each buffer is respectively positioned above the screen cloth of a vibrating screen, each vibrating screen is respectively fixed above the mud tank, and the mud outlet of each vibrating screen respectively enters the mud tank.

As a further improvement of the utility model, the vibrating screens are arranged in three groups side by side.

As the improvement of the utility model, the mud umbrella is of an integral structure, and the central opening of the mud umbrella and the top of the anti-overflow pipe are welded into a whole; the side wall of the upper part of the overflow preventing pipe is also connected with a flushing pipe.

As a further improvement of the utility model, the buffer is a square box body, the left side wall and the right side wall of the square box body are respectively provided with a plurality of hollow side wall vertical grooves, and each side wall vertical groove respectively extends from the middle part to the bottom part in the height direction of the side wall.

As a further improvement of the utility model, the lower part of the rear side of the inner cavity of the square box body is provided with a guide plate which inclines forwards and downwards, the upper end of the guide plate is welded with the rear wall of the square box body, the lower end of the guide plate is welded with the bottom wall of the square box body, and the side wall vertical grooves are all positioned on the front side of the lower edge of the guide plate.

As a further improvement of the utility model, the front wall of the square box body is provided with a plurality of hollow front wall vertical grooves, and each front wall vertical groove is positioned at the lower part of the front wall and is lower than the side wall vertical groove in height.

As a further improvement of the utility model, a plurality of bottom wall strip seams are uniformly distributed on the bottom wall of the square box body, each bottom wall strip seam extends forwards from the lower edge of the guide plate, the bottom wall is covered with a drawing and inserting plate, the front end of the drawing and inserting plate extends out from the strip seam at the lower end of the front wall, drawing and inserting plate strip seams are distributed on the drawing and inserting plate, the drawing and inserting plate strip seams correspond to the bottom wall strip seams, and the width of the drawing and inserting plate strip seams is smaller than that of the bottom wall strip seams.

As a further improvement of the utility model, the middle part of the front side of the drawing and inserting plate is provided with a drawing and inserting plate handle, and the two sides of the buffer are symmetrically welded with buffer handles.

As a further improvement of the utility model, a square flange is arranged at the lower port of the inlet elbow of the vibrating screen, and the square flange is fixedly connected with the top cover of the square box body through bolts.

As a further improvement of the utility model, the aperture of the inlet elbow of the vibrating screen is 273mm, the width of the square box body in the left-right direction is 450mm, the width of the square box body in the front-back direction is 400mm, the height of the square box body is 250mm, the wall thickness is 6mm, the height of the guide plate is 100mm, and the included angle between the guide plate and the bottom wall is 45 degrees; the width of the side wall vertical groove is 50mm, the height of the side wall vertical groove is 150mm, and three side wall vertical grooves are respectively arranged on two side walls; the width of the front wall vertical groove is 50mm, and the height of the front wall vertical groove is 70 mm; the width of the strip seam of the drawing and inserting plate is 20mm, the length of the strip seam of the drawing and inserting plate is 250mm, and seven strips are uniformly distributed.

Compared with the prior art, the utility model has the following beneficial effects: the drilling fluid is buffered by the buffer before falling into the vibrating screen, so that the impact force of the drilling fluid is greatly reduced, rock debris is prevented from directly impacting the screen cloth, the damage and the replacement of the screen cloth are reduced, and the cost consumption of a drilling crew is reduced. The average damaged screening cloth per month of a single well is reduced from 47 screening cloth to 7 screening cloth, the cost of the screening cloth is saved by 16 ten thousand yuan per month, the economic benefit is greatly improved, the workload of replacing the screening cloth is greatly reduced, and the production efficiency is improved.

Drawings

The utility model will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the utility model.

Fig. 1 is an overall structural view of a drilling fluid low-fault circulation system according to the present invention.

Fig. 2 is an enlarged view of the wellhead section of fig. 1.

Fig. 3 is a front view of the drilling fluid damper of fig. 1.

Fig. 4 is a left side view of fig. 3.

Fig. 5 is a top view of fig. 3.

Fig. 6 is a right side view of fig. 3.

Fig. 7 is a top view of the overcurrent insert board in fig. 3.

In the figure: 1. a mud tank; 2. a drilling fluid circulating pump; 3. an underground pipeline; 4. a riser; 5. a hose; 6. driving the gooseneck by the top; 7. a drill stem; 8. a sleeve; 9. a wellhead cross joint; 10. a semi-closed blowout preventer; 11. a full seal blowout preventer; 12. an annular blowout preventer; 13. an anti-overflow pipe; 14. a slurry umbrella; 15. a flush tube; a U-shaped slot; 16a.U channel bends; 17. a slurry funnel; 18. a slurry guide pipe; 19. a slurry distribution tank; 20. a mud distribution valve; 21. an inlet elbow of the vibrating screen; square flange, 21 a; 22. a buffer; 22a, side wall vertical slots; 22b. a baffle; 22c, front wall vertical slots; 22d, drawing and inserting the board; 22e, drawing and inserting the batten seam; 22f, drawing and inserting the board handle; 22g. bumper handle; 23. vibrating screen; 24. a drilling platform; 25. and (4) a blow-off valve.

Detailed Description

In the following description of the present invention, the terms "front", "rear", "left", "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not mean that the tool must have a specific orientation.

As shown in fig. 1 and 2, the low-fault drilling fluid circulation system comprises a drilling fluid circulation pump 2 connected with a mud tank 1, wherein an outlet of the drilling fluid circulation pump 2 is connected with a vertical pipe 4 through an underground pipeline 3, the vertical pipe 4 is connected with a top drive gooseneck 6 through a water hose 5, the top drive gooseneck 6 is installed at the top of a drill rod 7, the drill rod 7 penetrates through a casing 8 and extends downwards, a wellhead cross 9 is installed at the top of the casing 8, a half-seal blowout preventer 10, a full-seal blowout preventer 11 and an annular blowout preventer 12 are sequentially installed above the wellhead cross 9, an upward extending anti-overflow pipe 13 is connected to the top of the annular blowout preventer 12, a mud umbrella 14 is connected to the top of the anti-overflow pipe 13, and the mud umbrella 14 is located below a drilling platform 24.

The side wall of the upper part of the anti-overflow pipe 13 is welded with a U-shaped groove 16 with an opening at the upper end, the end plate at the tail end of the U-shaped groove 16 is welded with a U-shaped groove elbow 16a, the outlet of the U-shaped groove elbow 16a is inserted into a mud funnel 17, the outlet of the mud funnel 17 is connected with a mud flow guide pipe 18, the outlet elbow of the mud flow guide pipe 18 is downwards inserted into a mud distribution groove 19, the side wall of the mud distribution groove 19 is provided with at least two mud distribution valves 20, the outlet of each mud distribution valve 20 is respectively connected with a vibrating screen inlet elbow 21, each vibrating screen inlet elbow 21 is respectively provided with a buffer 22, each buffer 22 is respectively positioned above the screen cloth of each vibrating screen 23, each vibrating screen 23 is respectively fixed above the mud tank 1, and the mud outlet of each vibrating screen 23 respectively enters the mud tank 1. The vibrating screens 23 may be arranged in three groups side by side.

The drilling fluid in the mud tank 1 is pumped out by a drilling fluid circulating pump 2, the high-pressure drilling fluid enters a vertical pipe 4 through an underground pipeline 3, enters a top drive gooseneck pipe 6 through a water hose, descends to the bottom of the well along a drill stem 7 and is sprayed out from a drill water hole, high-pressure fluid is formed at the bottom of the well to wash the well and help the drill bit to break rock and carry out rock debris in the well, the rock debris goes up to the wellhead along the annular space of the casing pipe 8 and the drill rod 7 and goes up to the U-shaped groove 16 along the anti-overflow pipe 13 to flow out, and then falls into the mud funnel 17 from the U-shaped groove elbow 16a, and the drilling fluid enters the slurry distribution groove 19 along the slurry guide pipe 18, enters the corresponding vibrating screen 23 from the opened slurry distribution valve 20 and the inlet elbow 21 of the vibrating screen, and is buffered by the buffer 22 before falling into the vibrating screen 23, so that the impact force of the drilling fluid is greatly reduced, the rock debris is prevented from directly impacting the screen cloth, the damage and the replacement of the screen cloth are reduced, and the cost consumption of a drilling crew is reduced. When a screen cloth needs to be replaced, the corresponding mud distribution valve 20 is closed and another vibrating screen 23 is activated.

And a blowout valve 25 is arranged on one side of the wellhead four-way 9, when a drilling tool is in blowout, the blowout valve 25 is opened firstly, then the annular blowout preventer 12 is closed, and the half-seal blowout preventer 10 is closed after the delay of 5 seconds to realize soft well closing. When no drilling tool is used for blowout, the blowout valve 25 is opened first, and then the full-seal blowout preventer 11 is closed, so that the well can be closed softly.

The mud umbrella 14 is of an integral structure, and the central opening of the mud umbrella is welded with the top of the anti-overflow pipe 13 into a whole; the upper side wall of the overflow preventing pipe 13 is also connected with a flushing pipe 15. As the upper side wall of the anti-overflow pipe 13 is connected with the open U-shaped groove 16, as long as the flow cross section of the U-shaped groove 16 is large enough, the drilling fluid can flow out automatically from the U-shaped groove 16 and can not flow up into the slurry umbrella 14, so that the size of the slurry umbrella can be greatly reduced, and the bolt and splicing workload for assembling the slurry umbrella is eliminated. The top of the anti-overflow pipe 13 is directly welded with the central hole of the slurry umbrella 14 into a whole, so that the anti-overflow pipe higher than the slurry umbrella 14 is eliminated, and the weight of the slurry umbrella 14 is greatly reduced; and the U-shaped groove 16 can be made of iron sheet without bearing pressure, thereby further reducing the weight. The mud umbrella 14 of this system only needs two people to cooperate, can accomplish the installation in 20 minutes, greatly reduced intensity of labour, improved production efficiency. The flushing pipe 15 can be directly welded on the anti-overflow pipe 13 and can be connected with flushing water when the flushing is needed.

As shown in fig. 3 to 7, the buffer 22 is a square box, the left and right side walls of the square box are respectively provided with a plurality of hollow-out side wall vertical grooves 22a, and each side wall vertical groove 22a extends from the middle part to the bottom part in the height direction of the side wall. The drilling fluid from the inlet elbow 21 of the vibrating screen firstly impacts the bottom wall of the buffer 22 and then turns to flow out from the vertical grooves 22a on the side walls on two sides, and the rock debris carried by the drilling fluid is subjected to energy dissipation by impacting the bottom wall and then turns to flow out from the side walls in an overflow mode, so that the impact force on the screen cloth is greatly reduced. Compared with an NPI-G05(GB) well, the average damaged screen cloth of a single well per month is reduced from 47 screen cloth to 7 screen cloth, the cost of the screen cloth is saved by 16 ten thousand yuan per month, the economic benefit is greatly improved, the workload of replacing the screen cloth is greatly reduced, and the production efficiency is improved.

The lower part of the rear side of the inner cavity of the square box body is provided with a guide plate 22b which inclines forwards and downwards, the upper end of the guide plate 22b is welded with the rear wall of the square box body, the lower end of the guide plate 22b is welded with the bottom wall of the square box body, and the side wall vertical grooves 22a are all positioned on the front side of the lower edge of the guide plate 22b. Since the bumper 22 is close to the rear side wall of the shaker 23, it is desirable to have the drilling fluid flow out further forward; the arrangement of the guide plate 22b can prevent rock debris from being retained at the rear side of the buffer 22, guide slurry to the side wall vertical groove 22a close to the front side and flow out, and utilize the screen cloth area of the front side as much as possible.

The front wall of the square box body is provided with a plurality of hollow front wall vertical grooves 22c, and each front wall vertical groove 22c is positioned at the lower part of the front wall and is lower than the side wall vertical groove 22a in height. The addition of the front wall vertical slot 22c can further improve the flow capacity of the buffer 22 and increase the drilling fluid discharge capacity.

The bottom wall of the square box body is uniformly distributed with a plurality of bottom wall strip seams, each bottom wall strip seam extends forwards from the lower edge of the guide plate 22b, the bottom wall is covered with a drawing and inserting plate 22d, the front end of the drawing and inserting plate 22d extends out from the strip seam at the lower end of the front wall, a drawing and inserting plate strip seam 22e is distributed on the drawing and inserting plate 22d, the drawing and inserting plate strip seam 22e corresponds to the bottom wall strip seam, and the width of the drawing and inserting plate strip seam 22e is smaller than that of the bottom wall strip seam. The drawing and inserting plate strip seam 22e plays a role in increasing slurry overflowing, the width of the drawing and inserting plate strip seam 22e is narrow, and a large amount of rock debris is prevented from directly falling through the drawing and inserting plate strip seam 22e. The arrangement of the inserting plate 22d can prolong the service life of the buffer 22, and meanwhile, the inserting plate 22d with different slot densities can be replaced according to needs to adjust the overcurrent capacity and avoid the overall replacement of the buffer 22.

The middle part of the front side of the plug board 22d is provided with a plug board handle 22f, which is convenient for taking out the plug board 22d. The buffer handles 22g are symmetrically welded to the two sides of the buffer 22, so that the buffer is convenient to transport and mount.

The lower port of the inlet elbow 21 of the vibrating screen is provided with a square flange 21a, and the square flange 21a is fixedly connected with the top cover of the square box body through bolts. Facilitating the connection and disconnection of the inlet bend 21 of the vibrating screen with the buffer.

The caliber of the inlet elbow 21 of the vibrating screen is 273mm, the width of the square box body in the left-right direction is 450mm, the width of the square box body in the front-back direction is 400mm, the height of the square box body is 250mm, the wall thickness is 6mm, the height of the guide plate 22b is 100mm, and the included angle between the guide plate and the bottom wall is 45 degrees; the width of the side wall vertical groove 22a is 50mm, the height is 150mm, and three side wall vertical grooves 22a are respectively arranged on two side walls; the width of the front wall vertical groove 22c is 50mm, and the height is 70 mm; the width of the strip slot 22e of the drawing and inserting plate is 20mm, the length is 250mm, and seven lines are uniformly distributed. The discharge capacity of the drilling fluid can reach more than 60L/min, and the satisfactory drilling rate is 40-140 m/h.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims

1. The utility model provides a low trouble circulation system of drilling fluid, includes the drilling fluid circulating pump that links to each other with the mud jar, the export of drilling fluid circulating pump passes through underground piping and links to each other with the riser, the riser is driven the gooseneck through the water hose and is linked to each other with the top, the gooseneck is driven on the top and is installed in the top of drilling rod, the drilling rod passes from the sleeve pipe and extends its characterized in that to the pit: the top of the sleeve is provided with a wellhead four-way, a half-seal blowout preventer, a full-seal blowout preventer and an annular blowout preventer are sequentially arranged above the wellhead four-way, the top of the annular blowout preventer is connected with an upward extending anti-overflow pipe, the top of the anti-overflow pipe is connected with a mud umbrella, the mud umbrella is positioned below a drilling platform, the side wall of the upper part of the anti-overflow pipe is welded with a U-shaped groove with an opening at the upper end, the end plate at the tail end of the U-shaped groove is welded with a U-shaped groove elbow, the outlet of the U-shaped groove elbow is inserted into a mud funnel, the outlet of the mud funnel is connected with a mud flow guide pipe, the outlet elbow of the mud flow guide pipe is downwards inserted into a mud distribution groove, the side wall of the mud distribution groove is provided with at least two mud distribution valves, the outlet of each mud distribution valve is respectively connected with a vibrating screen inlet elbow, and each vibrating screen inlet elbow is respectively provided with a buffer, each buffer is respectively positioned above the screen cloth of the vibrating screen, each vibrating screen is respectively fixed above the mud tank, and the mud outlets of the vibrating screens respectively enter the mud tank.

2. The drilling fluid low-fault circulation system of claim 1, wherein: the mud umbrella is of an integral structure, and a central hole of the mud umbrella is welded with the top of the anti-overflow pipe into a whole; the side wall of the upper part of the overflow preventing pipe is also connected with a flushing pipe.

3. The drilling fluid low-fault circulation system of claim 1, wherein: the buffer is square box, the lateral wall is equipped with the lateral wall of multichannel fretwork respectively about square box and erects the groove, and each lateral wall erects the groove and extends to the bottom from the middle part of lateral wall direction of height respectively.

4. The drilling fluid low-fault circulation system of claim 3, wherein: the lower part of the rear side of the inner cavity of the square box body is provided with a guide plate which inclines towards the front lower part, the upper end of the guide plate is welded with the rear wall of the square box body, the lower end of the guide plate is welded with the bottom wall of the square box body, and the side wall vertical grooves are all positioned at the front side of the lower edge of the guide plate.

5. The drilling fluid low-fault circulation system of claim 4, wherein: the antetheca of square box is equipped with the antetheca of multichannel fretwork and erects the groove, and each antetheca erects the lower part that the groove is located the antetheca and highly is less than the lateral wall and erects the groove.

6. The drilling fluid low-fault circulation system of claim 5, wherein: the square box body is characterized in that a plurality of bottom wall strip seams are uniformly distributed on the bottom wall of the square box body, each bottom wall strip seam extends forwards from the lower edge of the guide plate, a drawing board is covered on the bottom wall, the front end of the drawing board extends out of the strip seam at the lower end of the front wall, drawing board strip seams are distributed on the drawing board, the drawing board strip seams correspond to the bottom wall strip seams, and the width of the drawing board strip seams is smaller than that of the bottom wall strip seams.

7. The drilling fluid low-fault circulation system of claim 6, wherein: the middle part of the front side of the drawing and inserting plate is provided with a drawing and inserting plate handle, and the two sides of the buffer are symmetrically welded with buffer handles.

8. The drilling fluid low-fault circulation system of claim 3, wherein: the lower port of the inlet elbow of the vibrating screen is provided with a square flange, and the square flange is fixedly connected with the top cover of the square box body through bolts.

9. The drilling fluid low-fault circulation system of claim 6, wherein: the caliber of the inlet elbow of the vibrating screen is 273mm, the width of the square box body in the left-right direction is 450mm, the width of the square box body in the front-back direction is 400mm, the height of the square box body is 250mm, the wall thickness is 6mm, the height of the guide plate is 100mm, and the included angle between the guide plate and the bottom wall is 45 degrees; the width of the side wall vertical groove is 50mm, the height of the side wall vertical groove is 150mm, and three side wall vertical grooves are respectively arranged on two side walls; the width of the front wall vertical groove is 50mm, and the height of the front wall vertical groove is 70 mm; the width of the strip seam of the drawing and inserting plate is 20mm, the length of the strip seam of the drawing and inserting plate is 250mm, and seven strips are uniformly distributed.

10. The drilling fluid low-fault circulation system of any one of claims 1 to 9, wherein: three groups of vibrating screens are arranged side by side.