CN111441716A - Rotary Steering Drilling System Test Matching System Wellbore Matching System - Google Patents

Abstract

A wellbore supporting system for a test supporting system of a rotary steerable drilling system is mainly composed of a wellhead device, a wellbore system, and a moving opening and closing wellbore which are sealed and connected in sequence and then supported by a wellbore support; The horizontal section wellbore is arranged from high to low and connected tangentially; the horizontal section wellbore is divided into two parts: the first horizontal section wellbore and the second horizontal section wellbore, and the two parts are sealed and connected by the moving opening and closing wellbore. The present invention is dedicated to solving the problem of the ability of simulating drill string passability in the process of ground simulation test of rotary steerable products; carrying out research on the force of drill string in wells with small curvature radius during drilling, and improving the overall test of rotary steerable drilling system Support system test capabilities, and solve the industry problem of drilling fluid pollution on the test site.

Description

Rotary Steering Drilling System Test Matching System Wellbore Matching System

technical field

The invention relates to the field of oil and natural gas drilling and production, in particular to the provision of an indoor ground simulation test device for rotary steerable products in the oil and natural gas drilling and production industries.

Background technique

With the needs of special oil wells such as ultra-deep wells, highly difficult directional wells, horizontal wells, extended reach wells and horizontal lateral wells for the development of special oil reservoirs in domestic oilfields, the research on rotary steerable drilling technology has become increasingly enthusiastic. In order to research and develop rotary steerable technology products, A reliable ground simulation test device is one of the necessary conditions. The ground simulation test before going downhole is carried out to verify and detect the functional principle, guiding force and guiding effect of the rotary steerable tool, and to evaluate the reliability of the tool product.

The various rotary steering test devices established by domestic and foreign oilfield companies do not have a wellbore simulation system, which cannot simulate the study of drill string passability with too small curvature radius, and conduct research on the force of drill string in wells with small curvature radius during drilling. Since there is no wellbore simulation system, there is no special channel for backflow of drilling fluid, but direct drainage is adopted. The drilling fluid is discharged arbitrarily at the test site, which is easy to cause environmental pollution.

SUMMARY OF THE INVENTION

The invention provides a wellbore supporting system for the test supporting system of the rotary steerable drilling system, which is dedicated to solving the problem that the drill string can simulate the passability of the drill string with too small curvature radius during the ground simulation test process of the rotary steerable product; The research on the force in radial wells will improve the overall test capability of the rotary steerable drilling system test supporting system, and solve the industry problem of environmental pollution by drilling fluids at the test site.

The technical scheme adopted in the present invention is:

A wellbore supporting system for a test supporting system of a rotary steerable drilling system is mainly composed of a wellhead device, a wellbore system, and a moving opening and closing wellbore which are sealed and connected in sequence and then supported by a wellbore support; The horizontal section wellbore is arranged from high to low and connected tangentially; the horizontal section wellbore is divided into two parts: the first horizontal section wellbore and the second horizontal section wellbore, and the two parts are sealed and connected by the movable opening and closing wellbore.

The wellhead device comprises a wellhead cylinder body, the lower end of the wellhead cylinder body is a wellhead connection flange, the upper end is a wellhead flange, the wellhead flange is connected with the sealing seat, and the sealing gland is sealed and installed on the sealing seat to connect the drill string. The seal is installed in the wellhead barrel; an oil plug is installed on the middle wall of the wellhead barrel.

The movable opening and closing wellbore includes an upper opening and closing wellbore and a lower opening and closing wellbore, the upper opening and closing wellbore and the lower opening and closing wellbore are rotatably connected to a hinge shaft, and the hinge shaft is installed on the vehicle body; the upper opening and closing wellbore cylinder is driven by a transmission The arm is connected with the outer wall of the upper opening and closing wellbore to realize the opening and closing movement of the upper opening and closing wellbore; the lower opening and closing wellbore cylinder is connected with the outer wall of the lower opening and closing wellbore through the transmission arm to realize the opening and closing movement of the lower opening and closing wellbore; The wellbore and the lower opening and closing wellbore are connected to a closed state by locking bolts and locking nuts. In the closed state, the first horizontal section wellbore and the second horizontal section wellbore are sealed by axial and radial gaskets or rings.

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

The wellhead connecting flanges at the lower end of the wellhead barrel of the wellhead device, the flanges at both ends of the wellbore in the inclined straight section, the flanges at both ends of the wellbore in the curved section, and the flanges at both ends of the wellbore in the horizontal section, one side between the adjacent flanges is convex. When the flange is used, the other side is a concave flange. After the convex and concave flanges are matched with each other to seal the O-ring, they are connected together by high-strength double-ended studs and high-strength nuts.

The drill string adopts an internal hollow structure, and the wellhead barrel of the wellhead device, the wellbore of the inclined straight section, the wellbore of the curved section, the wellbore of the first horizontal section, the wellbore of the second horizontal section, and the inner wall of the movable opening and closing wellbore form an annulus with the outer wall of the drill string. , a drilling fluid outlet is opened on the wellbore wall of the second horizontal section.

The invention adopts the wellbore matching system to simulate the well with small curvature, and can carry out the research on the passability of the drill string with too small curvature radius during the ground simulation test of the rotary steerable product, and carry out the force condition of the drill string in the well with the small curvature radius during the drilling process. Research and improve the test capability of rotary steerable drilling system. At the same time, the wellbore supporting system is used to establish an annular channel, so that the test slurry can enter the drilling fluid treatment system along the annular dedicated channel during the whole test process, which solves the problem of environmental pollution caused by the direct discharge of drilling fluid during the test process.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the schematic diagram of the wellhead device of the present invention;

Figure 3-1 is a schematic cross-sectional view of the closed state of the mobile opening and closing wellbore of the present invention;

Figure 3-2 is a schematic cross-sectional view of the open state of the mobile opening and closing wellbore of the present invention;

4 is a schematic diagram of the connection between the wellhead device and the wellbore of the present invention;

FIG. 5 is a schematic diagram of the connection between the mobile opening and closing wellbore and the horizontal section wellbore according to the present invention.

Detailed ways

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

The invention discloses a rotary steerable drilling system test supporting system wellbore supporting system, which is dedicated to solving the problem that in the process of ground simulation test of rotary steerable products, it can simulate the research on the passability of the drill string with too small curvature radius, and carry out the drill string in the process of drilling in the small curvature radius. The research on the force in the radius well has improved the test capability of the rotary steerable drilling system test system as a whole. And solve the industry problem that the drilling fluid pollutes the environment at the test site.

Referring to Fig. 1, a wellbore supporting system of a rotary steerable drilling system test supporting system is mainly composed of a wellhead device 1, a wellbore system, and a mobile opening and closing wellbore 4, which are sealed and connected in sequence and supported by a wellbore support 3; the wellbore system is supported by an inclined The straight section wellbore 2-1, the curved section wellbore 2-2, the curved section wellbore 2-2 is prefabricated by bending the casing according to the pre-designed bending radius, and the horizontal section wellbore 2-3 is arranged from high to low and connected in the tangential direction. The horizontal section wellbore 2-3 is divided into two parts: the first horizontal section wellbore 2-3-1 and the second horizontal section wellbore 2-3-2, and the two parts are sealedly connected by the movable opening and closing wellbore 4 . The wellbore system adopts oil casing to simulate the well depth structure, and the wellbore support 3 adopts a truss structure welded by section steel, and the wellbore support 3 is installed on the ground.

2, the wellhead device 1 includes a wellhead barrel 1-7, the lower end of the wellhead barrel 1-7 is a wellhead connecting flange 1-8, and the upper end is a wellhead flange 1-5. 1-5 is connected with the sealing seat 1-4, and the sealing gland 1-2 is sealingly installed on the sealing seat 1-4 to seal the drill string 1-1 in the wellhead barrel 1-7, but the drill string 1- 1. An annular space is formed between the outer wall and the inner wall of the wellhead barrel 1-7; an oil plug 1-6 is installed on the middle wall of the wellhead barrel 1-7. The sealing gland 1-2, the sealing seat 1-4 and the drill string 1-1 are sealed by the sealing gasket or the ring 1-3.

3-1, 3-2, the mobile opening and closing wellbore 4 includes an upper opening and closing wellbore 4-1, a lower opening and closing wellbore 4-6, the upper opening and closing wellbore 4-1 and the lower opening and closing wellbore 4-6 The hinge shaft 4-2 is rotatably connected to the hinge shaft 4-2, and the hinge shaft 4-2 is installed on the vehicle body 4-4; The opening and closing movement of the closing wellbore 4-1; the lower opening and closing wellbore cylinder 4-7 is connected with the outer wall of the lower opening and closing wellbore 4-6 through the transmission arm to realize the opening and closing movement of the lower opening and closing wellbore 4-6; the upper opening and closing The wellbore 4-1 and the lower opening and closing wellbore 4-6 are connected to a closed state by a locking bolt 4-8 and a locking nut 4-9. The wellbore 2-3-1 in the first horizontal section and the wellbore 2-3-2 in the second horizontal section are closed without leakage.

Wheels are arranged on the car body 4-4 of the moving opening and closing wellbore 4, and the rails are arranged in parallel in the axial direction perpendicular to the horizontal section of the wellbore 2-3, and the moving opening and closing wellbore 4 is automatically or manually driven along the track by the wheels, That is, it moves back and forth perpendicular to the axial direction of the horizontal section of the wellbore.

Referring to Figure 4, the wellhead connecting flanges 1-8 at the lower end of the wellhead barrel 1-7 of the wellhead device 1, the flanges at both ends of the inclined and straight section of the wellbore 2-1, the flanges at both ends of the curved section of the wellbore 2-2, the horizontal The flanges at both ends of the wellbore 2-3 in section 2-3, when one side between each adjacent flange is a convex flange 4-16, the other side is a concave flange 4-12, the convex and concave flanges are adapted to each other and pass through After the O-ring 4-13 is sealed and assembled, it is connected as a whole through the high-strength double-ended stud 4-14 and the high-strength nut 4-15.

5, the drill string 1-1 adopts an internal hollow structure, the wellhead body 1-7 of the wellhead device 1, the wellbore 2-1 in the inclined and straight section, the wellbore in the curved section 2-2, and the wellbore in the first horizontal section 2-3-1 , The inner wall of the second horizontal section wellbore 2-3-2 and the movable opening and closing wellbore 4 form an annulus with the outer wall of the drill string 1-1, and a drilling fluid outlet 4-10 is opened on the wall of the second horizontal section wellbore 2-3-2 . After the drilling fluid passes through the inside of the drill string and reaches the rotating tool, it enters the mud treatment system from the drilling fluid outlet 4-10 through the annulus.

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

Apply force on the head of the drill pipe (abbreviated as WOB), the drill pipe can be run from the wellhead device 1, and the drilled pipes are connected to each other to form the drill pipe 1-1. According to the process needs, the standard length of each run can be made Drill pipe or drill pipe of specified length, the drill pipe passes through the inclined straight section of the wellbore 2-1 and enters the curved section of the wellbore 2-2, the curved section of the wellbore 2-2 is prefabricated by bending the oil casing according to the pre-designed bending radius, and the bending radius According to the needs of simulating a small curvature radius wellbore, it is necessary to decide how much bending radius to use. According to the drill pipe passing through the curved section of the wellbore 2-2, the WOB applied to the head of the drill pipe can be measured to establish the diameter of the drill string, the curvature of the bending section, and apply the WOB. The relationship between simulating drill string is too small curvature radius to provide technical support for oilfield drilling;

When the drill pipe passes through the curved section wellbore 2-2 to the horizontal section wellbore 2-3, the horizontal section wellbore is arranged in two sections, with an opening in the middle, and the length of the opening is determined according to the length of the drill pipe running each time. The two sections of horizontal wellbore that are disconnected from the horizontal section are connected by moving the opening and closing wellbore,

The drilling pressure and rotational torque are applied at the drill pipe at the head of the wellhead device 1, which drives the entire drill string to rotate, thereby driving the rotary tool to rotate the drilling operation to carry out a simulated drilling test. The drilling fluid flows through the inner wall of the drill string 1-1 and passes through the rotary tool. Then, on the one hand, the drill bit and tools are cooled, and on the other hand, the cuttings in the drilling project are taken away. The drilling fluid containing cuttings passes through the wellhead device 1, the inclined and straight section wellbore 2-1, the curved section wellbore 2-2, and the horizontal section. The inner wall of the section wellbore 2-3 and the movable opening and closing wellbore 4 and the outer wall of the drill string 1-1 form an annular channel, which enters the mud treatment system from the drilling fluid outlet 4-10. During the whole test process, every time a certain footage is drilled, the drill pipe needs to be connected. Due to the size of the wellbore system, the wellhead device 1 is usually close to 20 meters from the ground. It is inconvenient and unsafe to connect the drill pipe at the wellhead device 1. It is safe and reliable to connect a single root on the level ground on the first floor. When a single root needs to be connected, the mobile opening and closing wellbore 4 is opened, and the liquid in the annular space flows into the water tank arranged in the car body 4-4 of the mobile opening and closing wellbore 4, and the mobile opening and closing wellbore 4 can be automatically or manually left in the axial direction perpendicular to the horizontal wellbore. After completing the connection, move the opening and closing wellbore 4 to return along the way, through the first horizontal section of the wellbore 2-3-1 and the second horizontal section of the wellbore 2-3- 2. Connect the upper opening and closing wellbore 4-1, the lower opening and closing wellbore 4-6, and the sealing gasket or ring 4-5. When the moving opening and closing wellbore 4 is closed, the horizontal section wellbore 2-3-1 and the horizontal section wellbore 2-3-2 are sealed by the sealing gasket or the ring 4-5 without leakage. The annulus is closed without leakage during the whole test process, which solves the industry problem that the drilling fluid easily pollutes the environment during the test process.

During the whole test process, by establishing the relationship between WOB, torque and wellbore vibration in bending section, the force of drill string in wells with small curvature radius during drilling is studied, which provides a technical basis for oilfield exploitation of small curvature radius wells.

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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