CN111441716A - Shaft matching system of rotary steering drilling system test matching system - Google Patents

Abstract

A shaft matching system of a rotary steering drilling system test matching system is mainly formed by sequentially and hermetically connecting a wellhead device, a shaft system and a movable opening and closing shaft and then supporting by a shaft support; the shaft system is formed by arranging and tangentially connecting a slant straight section shaft, a bent section shaft and a horizontal section shaft from high to low; the horizontal section shaft is divided into a first horizontal section shaft and a second horizontal section shaft, and the two parts are connected in a sealing manner by a movable opening and closing shaft. The invention aims to solve the problem that the passability research of the undersize curvature radius of a drill column can be simulated in the ground simulation test process of a rotary guide product; the stress condition of a drill column in a well with small curvature radius in the drilling process is researched, the test capability of a rotary steering drilling system test matching system is integrally improved, and the industrial problem that drilling fluid pollutes the environment on a test site is solved.

Description

Shaft matching system of rotary steering drilling system test matching system

Technical Field

The invention relates to the field of petroleum and natural gas drilling, in particular to an indoor ground simulation test device for a rotary guide product in the petroleum and natural gas drilling industry.

Background

With the needs of special oil wells such as ultra-deep wells, highly difficult directional wells, horizontal wells, extended reach wells, horizontal branch wells and the like for developing special oil reservoirs in China, the research on the rotary steering drilling technology is increasingly intense, and in order to research and develop rotary steering technology products, a reliable ground simulation test device is one of the necessary conditions to perform ground simulation tests before descending into a well so as to verify and detect the functional principle, the guiding force and the guiding effect of a rotary steering tool and check the reliability of the tool products.

The rotary steering test device built by oil field companies at home and abroad has no shaft simulation system, and can not simulate the passability research of the drill string with small curvature radius and the stress condition research of the drill string in the well with small curvature radius in the drilling process. Because a shaft simulation system is not arranged, the drilling fluid is discharged without a special channel for backflow, but is directly discharged, and the drilling fluid is randomly discharged on a test site, so that the environmental pollution is easily caused.

Disclosure of Invention

The invention provides a shaft matching system of a rotary steering drilling system test matching system, which aims to solve the problem that the passability research of an undersize curvature radius of a drill column can be simulated in the ground simulation test process of a rotary steering product; the stress condition of a drill column in a well with small curvature radius in the drilling process is researched, the test capability of a rotary steering drilling system test matching system is integrally improved, and the industrial problem that drilling fluid pollutes the environment on a test site is solved.

The technical scheme adopted by the invention is as follows:

a shaft matching system of a rotary steering drilling system test matching system is mainly formed by sequentially and hermetically connecting a wellhead device, a shaft system and a movable opening and closing shaft and then supporting by a shaft support; the shaft system is formed by arranging and tangentially connecting a slant straight section shaft, a bent section shaft and a horizontal section shaft from high to low; the horizontal section shaft is divided into a first horizontal section shaft and a second horizontal section shaft, and the two parts are connected in a sealing manner by a movable opening and closing shaft.

The wellhead device comprises a wellhead cylinder, the lower end of the wellhead cylinder is provided with a wellhead connecting flange, the upper end of the wellhead cylinder is provided with a wellhead flange, the wellhead flange is connected with a sealing seat, and a sealing gland is arranged on the sealing seat in a sealing way so as to install the drill column in the wellhead cylinder in a sealing way; an oil plug is arranged on the middle wall of the well head cylinder.

The movable opening and closing shaft comprises an upper opening and closing shaft and a lower opening and closing shaft, the upper opening and closing shaft and the lower opening and closing shaft are rotatably connected to a hinge shaft, and the hinge shaft is arranged on the vehicle body; the upper opening and closing shaft cylinder is connected with the outer wall of the upper opening and closing shaft through a transmission arm to realize the opening and closing movement of the upper opening and closing shaft; the lower opening shaft cylinder is connected with the outer wall of the lower opening shaft through a transmission arm, so that the opening and closing movement of the lower opening shaft is realized; the upper opening and closing shaft and the lower opening and closing shaft are connected into a closed state through a locking bolt and a locking nut, and the first horizontal section shaft and the second horizontal section shaft are sealed through axial and radial sealing gaskets or rings in the closed state.

Wheels are arranged on the vehicle body of the movable opening and closing shaft, rails are arranged in parallel in the axial direction perpendicular to the horizontal section shaft, and the movable opening and closing shaft automatically or manually moves back and forth along the rails through the wheels.

The well head flange of well head barrel lower extreme, the flange at oblique straight section pit shaft both ends, the flange at bending section pit shaft both ends, the both ends flange of horizontal segment pit shaft of well head device, when one side is protruding flange between each adjacent flange, the opposite side is concave flange, and protruding, concave flange are connected as an organic wholely through high strength stud, high strength nut after sealed O type sealing washer of mutual adaptation.

The drill string is of an internal hollow structure, the inner walls of a wellhead cylinder body, an inclined straight section shaft, a bent section shaft, a first horizontal section shaft, a second horizontal section shaft and a movable opening and closing shaft of the wellhead device form an annular space with the outer wall of the drill string, and a drilling fluid outlet is formed in the second horizontal section shaft wall.

The invention adopts a shaft matching system to simulate the small-curvature well, can simulate the passability research of the simulated drill column with the small curvature radius in the ground simulation test process of the rotary steering product, and can also develop the stress condition research of the drill column in the small-curvature radius well in the drilling process, thereby improving the test capability of the rotary steering drilling system. Meanwhile, an annular channel is established by adopting a shaft matching system, so that the test slurry enters a drilling fluid treatment system along the annular special channel in the whole test process, and the problem of environmental pollution caused by direct discharge of the drilling fluid in the test process is solved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic illustration of a wellhead assembly according to the present invention;

FIG. 3-1 is a schematic cross-sectional view of a closed state of a mobile switching wellbore in accordance with the present invention;

FIG. 3-2 is a schematic cross-sectional view of the open state of the mobile switching wellbore of the present invention;

FIG. 4 is a schematic view of the coupling between the wellhead assembly and the wellbore in accordance with the present invention;

FIG. 5 is a schematic view of the connection of the mobile open/close wellbore and the horizontal section wellbore.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples.

The invention discloses a shaft matching system of a rotary steering drilling system test matching system, which aims to solve the problems that the passability research of a drill column with an excessively small curvature radius can be simulated in the ground simulation test process of a rotary steering product, the stress condition research of the drill column in a well with the small curvature radius in the drilling process can be developed, and the test capability of the rotary steering drilling system test system is integrally improved. And solves the industrial problem that the drilling fluid pollutes the environment on the test site.

Referring to fig. 1, a shaft matching system of a rotary steering drilling system test matching system is mainly formed by a wellhead device 1, a shaft system and a movable opening and closing shaft 4 which are sequentially connected in a sealing manner and then supported by a shaft support 3; the shaft system is formed by an inclined straight section shaft 2-1 and a bending section shaft 2-2, wherein the bending section shaft 2-2 is formed by bending and prefabricating a casing according to a preset bending radius, and a horizontal section shaft 2-3 is arranged from high to low and is connected in the tangential direction; the horizontal section shaft 2-3 is divided into a first horizontal section shaft 2-3-1 and a second horizontal section shaft 2-3-2, and the two parts are hermetically connected by a movable opening and closing shaft 4. The shaft system adopts an oil casing pipe to simulate a well depth structure, the shaft support 3 adopts a truss structure welded by section steel, and the shaft support 3 is arranged on the ground.

Referring to fig. 2, the wellhead device 1 comprises a wellhead cylinder 1-7, the lower end of the wellhead cylinder 1-7 is provided with a wellhead connecting flange 1-8, the upper end of the wellhead cylinder is provided with a wellhead flange 1-5, the wellhead flange 1-5 is connected with a seal seat 1-4, and a seal gland 1-2 is hermetically arranged on the seal seat 1-4 so as to hermetically install a drill string 1-1 in the wellhead cylinder 1-7, but an annular space is formed between the outer wall of the drill string 1-1 and the inner wall of the wellhead cylinder 1-7; an oil arbitrary plug 1-6 is arranged on the middle wall of the well mouth cylinder 1-7. The sealing gland 1-2, the sealing seat 1-4 and the drill string 1-1 are sealed through a sealing gasket or a ring 1-3.

Referring to fig. 3-1 and 3-2, the movable open-close shaft 4 comprises an upper open-close shaft 4-1 and a lower open-close shaft 4-6, the upper open-close shaft 4-1 and the lower open-close shaft 4-6 are rotatably connected to a hinge shaft 4-2, and the hinge shaft 4-2 is mounted on a vehicle body 4-4; the upper opening and closing shaft cylinder 4-3 is connected with the outer wall of the upper opening and closing shaft 4-1 through a transmission arm, so that the opening and closing movement of the upper opening and closing shaft 4-1 is realized; the lower opening shaft cylinder 4-7 is connected with the outer wall of the lower opening shaft 4-6 through a transmission arm to realize the opening and closing movement of the lower opening shaft 4-6; the upper opening shaft 4-1 and the lower opening shaft 4-6 are connected into a closed state through a locking bolt 4-8 and a locking nut 4-9, and the first horizontal section shaft 2-3-1 and the second horizontal section shaft 2-3-2 are sealed through an axial sealing gasket or a radial sealing gasket or ring 4-5 in the closed state and cannot leak.

Wheels are arranged on the vehicle body 4-4 of the movable opening and closing shaft 4, rails are arranged in parallel in the axial direction perpendicular to the horizontal section shaft 2-3, and the movable opening and closing shaft 4 automatically or manually moves back and forth along the rails, namely in the axial direction perpendicular to the horizontal section shaft.

Referring to fig. 4, a wellhead connecting flange 1-8 at the lower end of a wellhead cylinder 1-7 of the wellhead device 1, flanges at two ends of an inclined straight section shaft 2-1, flanges at two ends of a bent section shaft 2-2 and flanges at two ends of a horizontal section shaft 2-3, when a convex flange 4-16 is arranged on one side between every two adjacent flanges, a concave flange 4-12 is arranged on the other side, and the convex flange and the concave flange are mutually matched and are connected into a whole through a high-strength stud 4-14 and a high-strength nut 4-15 after being sealed and assembled through an O-shaped sealing ring 4-13.

Referring to fig. 5, a drill string 1-1 adopts an internal hollow structure, a wellhead cylinder 1-7 of a wellhead device 1, an inclined straight section shaft 2-1, a bent section shaft 2-2, a first horizontal section shaft 2-3-1, a second horizontal section shaft 2-3-2 and the inner wall of a movable opening and closing shaft 4 form an annular space with the outer wall of the drill string 1-1, and a drilling fluid outlet 4-10 is formed in the wall of the second horizontal section shaft 2-3-2. After passing through the interior of the drill string to the rotary tool, the drilling fluid enters the mud treatment system through the annulus from the drilling fluid outlets 4-10.

The working process of the invention can be simplified as follows:

applying force (drilling pressure for short) on the head of a drill stem, wherein the drill stem can be put in from a wellhead device 1, the put-in drill stems are connected with each other to form a drill stem 1-1, according to the process requirement, a drill stem with standard length or a drill stem with specified length can be put in each time, the drill stem enters a bent section shaft 2-2 through an inclined straight section shaft 2-1, the bent section shaft 2-2 is bent and prefabricated and molded by adopting an oil casing according to a pre-designed bending radius, the bending radius determines the bending radius according to the requirement of simulating a small-curvature-radius shaft body, the drilling pressure applied on the head of the drill stem can be measured according to the drill stem passing through the bent section shaft 2-2, the diameter of the drill stem, the curvature of the bent section and the correlation of the applied drilling pressure are established, the passability research of the;

when the drill rod reaches the horizontal section shaft 2-3 through the bending section shaft 2-2, the horizontal section shaft is arranged in a two-section mode, an opening is reserved in the middle, and the length of the opening is determined according to the length of the drill rod which is lowered each time. The two sections of horizontal mineshafts with the disconnected horizontal sections are connected through the movable opening and closing mineshaft,

applying bit pressure and rotation torque to a drill rod at the head of a wellhead device 1 to drive the whole drill string to rotate so as to drive a rotary tool to rotate to drill and carry out a simulated drilling test, wherein after drilling fluid flows through the rotary tool through the inner wall of the drill string 1-1, on one hand, the drilling bit and the tool are cooled, on the other hand, rock debris in drilling engineering is taken away, the drilling fluid containing the rock debris forms an empty channel with the outer wall of the drill string 1-1 through the wellhead device 1, an inclined straight section shaft 2-1, a bent section shaft 2-2, a horizontal section shaft 2-3 and a movable opening and closing shaft 4, and enters a slurry treatment system from a drilling fluid outlet 4-10. In the whole test process, when a certain footage is drilled, a drill rod needs to be connected, because the size relation of a shaft system, the distance between a wellhead device 1 and the ground is usually about 20 meters, and the connection of the drill rod at the position of the wellhead device 1 is inconvenient and unsafe, the connection of a single joint on the horizontal ground of a first floor is safe and reliable, when the single joint needs to be connected, a movable opening and closing shaft 4 is opened, annular liquid flows into a water tank arranged in a vehicle body 4-4 of the movable opening and closing shaft 4, the movable opening and closing shaft 4 can automatically or manually leave along the axial direction vertical to the horizontal shaft, after the single joint is connected, the movable opening and closing shaft 4 returns along a path and is connected through a first horizontal section shaft 2-3-1, a second horizontal section shaft 2-3-2, an upper opening and closing shaft 4-1, a lower opening and closing shaft 4-6 and. The horizontal section shaft 2-3-1 and the horizontal section shaft 2-3-2 are sealed by a sealing gasket or a ring 4-5 under the closed state of the movable opening and closing shaft 4 and cannot be leaked. The whole test process is sealed in an annular space without leakage, and the industrial problem that the drilling fluid is easy to pollute the environment in the test process is solved.

In the whole test process, through establishing the interrelation of the drilling pressure, the torque and the vibration condition of the bent section shaft, the stress condition research of the drill string in the small-curvature-radius well in the drilling process is developed, and a technical basis is provided for the exploitation of the small-curvature-radius well in the oil field.

Claims (6)

1. A shaft matching system of a rotary steering drilling system test matching system is characterized by mainly comprising a wellhead device (1), a shaft system and a movable opening and closing shaft (4) which are sequentially connected in a sealing manner and then supported by a shaft support (3); the shaft system is formed by arranging an inclined straight section shaft (2-1), a bent section shaft (2-2) and a horizontal section shaft (2-3) from high to low and connecting the inclined straight section shaft, the bent section shaft and the horizontal section shaft in a tangent mode; the horizontal section shaft (2-3) is divided into a first horizontal section shaft (2-3-1) and a second horizontal section shaft (2-3-2), and the two parts are connected in a sealing way by a movable opening and closing shaft (4).

2. The rotary steerable drilling system test kit wellbore kit of claim 1, wherein: the wellhead device (1) comprises a wellhead cylinder body (1-7), the lower end of the wellhead cylinder body (1-7) is provided with a wellhead connecting flange (1-8), the upper end of the wellhead cylinder body is provided with a wellhead flange (1-5), the wellhead flange (1-5) is connected with a sealing seat (1-4), and a sealing gland (1-2) is hermetically arranged on the sealing seat (1-4) so as to hermetically arrange the drill string (1-1) in the wellhead cylinder body (1-7); an oil-control plug (1-6) is arranged on the wall of the middle part of the well head cylinder (1-7).

3. The rotary steerable drilling system test kit wellbore kit of claim 1, wherein: the movable opening and closing shaft (4) comprises an upper opening and closing shaft (4-1) and a lower opening and closing shaft (4-6), the upper opening and closing shaft (4-1) and the lower opening and closing shaft (4-6) are rotatably connected to a hinge shaft (4-2), and the hinge shaft (4-2) is installed on a vehicle body (4-4); the upper opening and closing shaft cylinder (4-3) is connected with the outer wall of the upper opening and closing shaft (4-1) through a transmission arm to realize the opening and closing movement of the upper opening and closing shaft (4-1); the lower opening and closing shaft cylinder (4-7) is connected with the outer wall of the lower opening and closing shaft (4-6) through a transmission arm to realize the opening and closing movement of the lower opening and closing shaft (4-6); the upper opening and closing shaft (4-1) and the lower opening and closing shaft (4-6) are connected into a closed state through a locking bolt (4-8) and a locking nut (4-9), the first horizontal section shaft (2-3-1) and the second horizontal section shaft (2-3-2) are sealed through an axial sealing gasket or a radial sealing gasket or ring (4-5) in the closed state and cannot be leaked, and the upper opening and closing shaft cylinder (4-3) and the lower opening and closing shaft cylinder (4-7) are both installed on the vehicle body (4-4).

4. The system of claim 3, wherein the system comprises: wheels are arranged on the vehicle body (4-4) of the movable opening and closing shaft (4), rails are arranged in parallel in the axial direction perpendicular to the horizontal section shaft (2-3), and the movable opening and closing shaft (4) automatically or manually moves back and forth along the rails through the wheels.

5. The rotary steerable drilling system test kit wellbore kit of claim 1, wherein: the wellhead device is characterized in that wellhead connecting flanges (1-8) at the lower ends of wellhead cylinders (1-7) of the wellhead device (1), flanges at two ends of an inclined straight section shaft (2-1), flanges at two ends of a bent section shaft (2-2) and flanges at two ends of a horizontal section shaft (2-3), when a convex flange (4-16) is arranged at one side between every two adjacent flanges, a concave flange (4-12) is arranged at the other side, and after the convex flange and the concave flange are mutually matched and seal O-shaped sealing rings (4-13), the convex flange and the concave flange are connected into a whole through high-strength double-end studs (4-14) and high-strength nuts (4-15).

6. The rotary steerable drilling system test kit wellbore kit of claim 1, wherein: the drill string (1-1) adopts an internal hollow structure, a wellhead cylinder (1-7) of the wellhead device (1), an inclined straight section shaft (2-1) of a shaft system, a bending section shaft (2-2), a first horizontal section shaft (2-3-1), a second horizontal section shaft (2-3-2) and the inner wall of a movable opening and closing shaft (4) form an annular space with the outer wall of the drill string (1-1), and a drilling fluid outlet (4-10) is formed in the wall of the second horizontal section shaft (2-3-2).

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