CN104563920A - Tripping pipe column drilling fluid injection and circulation device and method - Google Patents

Abstract

The invention relates to a tripping pipe column drilling fluid injection and circulation device and a method, and belongs to the technical field of drilling well tripping pipe column operation in petroleum and natural gas industry. A lug seat and a U-shaped screw bolt are fixedly arranged on a drilling machine hanging ring, a motor is arranged at an input end of a speed reducing box, a connecting joint is connected with an output end of the speed reducing box, a connecting seal is arranged on the connecting joint, the tripping pipe column drilling fluid injection and circulation device is connected and sealed with a pipe column through the connecting joint and the connecting seal, the connecting seal is arranged on the connecting joint through a sealing press block and screws, the upper end of a pipeline connecting mechanism is provided with a drilling fluid circulation pipeline connector, the lower end of the pipeline connecting mechanism is connected with the connecting joint, the connecting joint is a rotating element, a first air cylinder is connected with a slide seat through a pin shaft, the first air cylinder is driven to drive the slide seat to vertically move along the guide rail, and a connecting rod mechanism is connected with the slide seat through a fifth pin shaft and a sixth pin shaft. In-factory bench tests show that the method and the device meet the design requirements and have the characteristics that the installation is fast and convenient, the operation is convenient, and safety and reliability are realized.

Description

Device and method for injecting and circulating drilling fluid in tripping string

technical field

The invention relates to a tripping string drilling fluid injection and circulation device and method, and belongs to the technical field of drilling tripping string operations in the petroleum and natural gas industry.

Background technique

In the oil and gas industry, drilling is the process of opening channels from the ground to oil and gas reservoirs, and plays a very important role in the process of oil and gas resource exploration and development. During the drilling process, the wellhead power equipment relies on the drill string to transmit power to the drill bit. The drill bit is gradually worn out while drilling through the rock at the bottom of the well, causing the drilling speed to drop. When the wear reaches a certain level, the drill bit needs to be replaced. . At this time, it is necessary to trip all the drill strings in the downhole, and then put all the drill strings into the well for tripping after replacing the drill bit. This is the tripping operation in drilling. Casing of a certain specification is run in the drilled wellbore according to the specified depth to stabilize the wellbore, isolate complex formations, and prepare for further drilling or mining. This is the casing operation in drilling. To sum up, the process of repeatedly lowering the pipe string, including drill pipe, casing, etc. into the bottom of the well or lifting it to the wellhead during the drilling process is the tripping operation of the pipe string. Drilling fluid plays a very important role in the drilling process, such as removing bottomhole cuttings, balancing formation pressure, cooling and lubricating drill bits and drill strings, obtaining drilled formation data, and transmitting drilling power, etc. In the process of tripping the pipe string, injection or circulation of drilling fluid should be carried out according to different situations, so as to avoid the excitation of the bottom hole pressure caused by the tripping of the pipe string, and reduce and avoid accidents such as obstruction, jamming and blowout.

Except for a few key wells in my country, which use top drive drilling, conventional wells mainly use rotary table drilling, and generally need to connect kelly to realize the injection and circulation of drilling fluid. This is a repeated operation process of making up and breaking out, which is time-consuming and laborious. . If there is resistance during the tripping process, it is difficult to realize the circulation of the drilling fluid in time because it is difficult to connect the kelly at this time, which may easily lead to pipe sticking accidents or blowout accidents. With the development of drilling in a complex and high-risk direction, how to reduce the risk of tripping and tripping pipe strings in rotary drilling is imminent. From the perspective of drilling production safety and improving efficiency, in order to ensure the normal drilling production, a set of devices that can realize drilling fluid injection and circulation during tripping and tripping is urgently needed.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a drilling fluid injection and circulation device and method for tripping strings.

A brand-new drilling fluid injection and circulation device for tripping pipe strings suitable for conventional rotary drilling rigs, which can quickly establish drilling fluid circulation channels and realize reliable connection with pipe strings during tripping, eliminating the need for drilling fluid circulation. The frequent operation of unloading and unloading kelly improves the safety of the drilling rig and reduces the occurrence of obstruction or jamming accidents during tripping; in addition, the use of this device can avoid wellhead mud overflow caused by rapid tripping and tripping , improve the efficiency of lifting and lowering the pipe string.

The technical scheme adopted in the present invention is:

A drilling fluid injection and circulation device for tripping pipe strings. The lug seat and U-shaped bolts are fixed on the lifting ring of the drilling rig. The installation position should be determined according to the end face of the pipe string held by the elevator. The end face of the column should be about 130mm ~ 150mm; the lug seat and U-bolt should be matched according to the lifting rings of different specifications used by the drilling rig;

The motor is installed at the input end of the reduction box, and the inside of the reduction box is a gear reduction mechanism, and the appropriate output torque and output speed are obtained through deceleration;

The connecting joint is connected to the output end of the reduction box, and the connecting joint is equipped with a connecting seal, and the drilling fluid injection and circulation device for pulling out the pipe string is connected and sealed with the pipe string through the connecting joint and the connecting seal;

The connection seal can be installed on the connection joint through the sealing pressure block, screw, etc.;

The upper end of the pipeline connection mechanism is the drilling fluid circulation pipeline interface, and the lower end of the pipeline connection mechanism is connected with the connection joint to form a channel for drilling fluid circulation; the connection joint is a rotating part;

The first cylinder is connected with the sliding seat through the pin shaft, driving the first cylinder can drive the sliding seat to move up and down along the guide rail; the connecting rod mechanism is connected with the sliding seat through the fifth pin shaft and the sixth pin shaft; the connecting rod mechanism includes the first connecting rod , the second connecting rod, the third connecting rod, the drive shaft, the drive cylinder, the fifth pin shaft, and the sixth pin shaft;

One end of the second cylinder is connected to the sliding seat through the seventh pin shaft, and the other end is connected to the linkage mechanism through the fourth pin shaft, and the second cylinder pushes the linkage mechanism to rotate;

The drive shaft is the rotating shaft of the link mechanism, and its lower end is connected with the box body of the reduction box to push the reduction box and the link mechanism to move synchronously;

The control system consists of the original air source processing unit, the second pressure gauge, the pressure bypass valve, the fourth pressure regulating valve, the fifth pressure gauge, the sixth reversing valve, the seventh reversing valve, the eighth reversing valve, the ninth pressure Table, the composition of the tenth pressure regulating valve;

The tenth pressure regulating valve, the ninth pressure gauge and the eighth reversing valve are respectively installed on the control pipeline of the motor, and the forward and reverse rotation of the motor is realized by controlling the eighth reversing valve;

The first cylinder is a single-acting cylinder, connected to the air source pipeline at the upper end of the cylinder, and the lower side of the cylinder is open to the atmosphere; when the pressure bypass valve and the sixth reversing valve are opened, the upper end of the cylinder is connected to the air source pressure, and the corresponding action is to push the slide The seat moves upward; when the pressure bypass valve is closed and the sixth reversing valve is opened, the fourth pressure regulating valve can be adjusted so that the upward thrust of the first cylinder is slightly smaller than the gravity of the device body, and the corresponding action is that the slide seat slowly descends;

The second cylinder is a double-acting cylinder, and the stroke of the cylinder determines the rotation angle of the connecting rod mechanism. The retraction of the cylinder corresponds to the recovery state of the device; the release of the cylinder corresponds to the connection and sealing state of the device.

When the pipe string held by the elevator is above the pipe string, the motor is started to rotate forward through the control system, and the connecting joint and the pipe string are quickly twisted through the reduction box; the connecting seal is installed on the connecting joint; the connecting seal contacts with the end face of the pipe string and a certain The amount of compression; when the drilling fluid injection and circulation are completed in the tripping operation, the motor is controlled by the control system to rotate in reverse, and the connection joint and the pipe string are quickly released; the first cylinder and the second cylinder are driven by the control system, Push the connecting joint to move up and swing out of the elevator.

A drilling fluid injection and circulation device and method for tripping strings, comprising the following steps;

Step 1. Fix the main body of the drilling fluid injection and circulation device for lifting and lowering pipe strings on the lifting ring of the drilling rig through fasteners such as U-shaped bolts, and connect the drilling fluid pipeline and the control gas pipeline of the motor and cylinder;

Step 2. During the operation of drilling and tripping the pipe string, when the drilling fluid needs to be poured and circulated, the two drive cylinders are respectively operated through the control system to push the connecting joint to swing to the wellhead position and descend to the top of the pipe string held by the elevator;

Step 3. Operate the motor to rotate in the forward direction through the control system, and drive the connecting joint and the pipe string to quickly turn the buckle through the reduction box. At this time, the connection seal contacts the end surface of the pipe string and a certain amount of compression occurs to produce a sealing effect. At this time, the grouting valve of the drilling rig can be opened, and the drilling fluid can be injected and circulated as required;

Step 4. When the injection or circulation of drilling fluid is finished, close the grouting valve of the drilling rig, operate the motor to reverse rotation through the control system, and connect the joint and the pipe string for quick release;

Step 5. Operate the driving cylinder through the control system, push the connecting joint to move upwards and swing to the outside of the elevator, leaving space for the pipe string to work without interfering with the normal lifting and lowering of the pipe string. At this time, the normal lifting and lowering of the pipe string can be carried out Operation;

Repeat steps 2 to 5 until the injection and circulation of drilling fluid in all tripping and tripping operations are completed.

The beneficial effects of the present invention are: the drilling fluid injection and circulation device for tripping strings provides a brand-new approach and method for drilling fluid injection and circulation for tripping strings of conventional rotary drilling rigs, and the device adopts a connecting rod mechanism for positioning Alignment, using the motor rotation to drive the connecting thread to establish a drilling fluid circulation channel, which can realize quick connection with the pipe string during the tripping process, and perform drilling fluid injection and circulation at any time, reducing the bottom hole pressure surge caused by the tripping string , to avoid the occurrence of drilling fluid level drop, wellbore pressure imbalance and overflow caused by tripping, improve the safety of drilling and tripping string operations, and reduce the occurrence of obstruction, jamming and blowout accidents during tripping; at the same time , the use of this device can avoid the frequent operations of unloading and unloading kelly due to drilling fluid circulation in conventional drilling, and has the characteristics of safety and high efficiency.

The present invention is a brand-new design, and according to a new search, there is no such equipment in China at present, so the present invention belongs to the technical invention of filling up the blank.

The principle prototype of the present invention is tested by bench tests in the factory and shows that it meets the design requirements, has the characteristics of fast installation, convenient operation, safety and reliability, and achieves the expected design purpose.

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will readily be learned by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and constitute A part of the present invention, the exemplary embodiment of the present invention and its description are used to explain the present invention, and do not constitute an improper limitation of the present invention, as shown in the figure:

Fig. 1 is the front view of the drilling fluid injection and circulation device for tripping the pipe string. At this time, the device is in the retracted state, avoiding the wellhead position, and normal tripping operations can be carried out;

Figure 2 is a schematic diagram of the device in working state, the device is connected to the wellhead string, and drilling fluid injection and circulation can be performed at this time;

Fig. 3 is a top view of the device, at which time the device is retracted;

Fig. 4 is a top view of the device, which corresponds to the connected state of the pipe string in Fig. 2;

Fig. 5 is a cross-sectional view of a connection joint and a connection seal;

Figure 6 is a schematic diagram of the control system.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Detailed ways

Obviously, many modifications and changes made by those skilled in the art based on the gist of the present invention belong to the protection scope of the present invention.

Embodiment 1: As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the drilling fluid injection and circulation device for lifting and lowering pipe strings includes: motor 1, reduction box 2, connection seal 3, connection Joint 4, drive shaft 5, guide rail seat 9, first cylinder 10, pin shaft 11, sliding seat 12, connecting rod mechanism 13, guide rail 14, lug seat 15, U-bolt 16, drilling fluid circulation pipeline interface 17, pipeline connection Mechanism 18, drive cylinder 19, sealing briquetting 21, screw 22 and control system 20 etc. are made up. For auxiliary explanation, the drawings also include the elevator 6, pipe string 7, and suspension ring 8 of the drilling rig. Its composition relationship is as follows:

As shown in Figure 1 and Figure 2, the drilling fluid injection and circulation device for lifting and lowering the pipe string can be fixed on the lifting ring 8 of the drilling rig through the ear socket 15, the U-shaped bolt 16, etc. The end face of the column 7 is determined, and the position of the connecting joint 4 should be about 130 mm to 150 mm higher than the end face of the column 7. Ear sockets 15 and U-shaped bolts 16 should be matched according to the lifting rings 8 of different specifications used by the drilling rig;

The motor 1 is installed at the input end of the reduction box 2, and the inside of the reduction box is a gear reduction mechanism, and the appropriate output torque and output speed are obtained through deceleration;

The connecting joint 4 is connected to the output end of the reduction box 2, and the connecting joint 4 is equipped with a connecting seal 3, and the drilling fluid injection and circulation device for lifting and lowering the pipe string is connected and sealed with the pipe string 7 through the connecting joint 4 and the connecting seal 3;

The connection seal 3 can be installed on the connection joint 4 through a sealing pressing block 21, a screw 22, etc., as shown in FIG. 5 ;

The upper end of the pipeline connection mechanism 18 is the drilling fluid circulation pipeline interface 17, and the lower end of the pipeline connection mechanism 18 is connected with the connection joint 4 to form a channel for drilling fluid circulation; because the connection joint 4 is a rotating part, the drilling fluid circulation pipeline is a non-rotating part , so the connection mechanism 18 needs to be able to realize the separation of rotation and stillness;

The first cylinder 10 is connected with the sliding seat 12 through the pin shaft 11, and driving the first cylinder 10 can drive the sliding seat 12 to move up and down along the guide rail 14; Connection; the link mechanism 13 includes a first connecting rod 13.1, a second connecting rod 13.2, a third connecting rod 13.3, a drive shaft 5, a drive cylinder 19, a fifth pin shaft 13.5, and a sixth pin shaft 13.6;

One end of the second cylinder 19 is connected with the sliding seat 12 through the seventh pin shaft 13.7, and the other end is connected with the connecting rod mechanism 13 through the pin shaft 13.4, and the second cylinder 19 promotes the connecting rod mechanism to rotate;

The drive shaft 5 is the rotating shaft of the link mechanism 13, and its lower end is connected with the casing of the reduction box 2 to push the reduction box 2 and the link mechanism 13 to move synchronously;

The control system 20 consists of an air source processing element 20.1, a second pressure gauge 20.2, a pressure bypass valve 20.3, a fourth pressure regulating valve 20.4, a fifth pressure gauge 20.5, a sixth reversing valve 20.6, a seventh reversing valve 20.7, a The eighth reversing valve 20.8, the ninth pressure gauge 20.9, and the tenth pressure regulating valve 20.10 are composed;

The tenth pressure regulating valve 20.10, the ninth pressure gauge 20.9 and the eighth reversing valve 20.8 are respectively installed on the control pipeline of the motor 1, and the forward and reverse rotation of the motor is realized by controlling the eighth reversing valve 20.8;

The first cylinder 10 is a single-acting cylinder, connected to the air source pipeline at the upper end of the cylinder, and the lower side of the cylinder is open to the atmosphere; when the pressure bypass valve 20.3 and the sixth reversing valve 20.6 are opened, the upper end of the cylinder is connected to the air source pressure, and the corresponding action To push the sliding seat 12 to move upward; when the pressure bypass valve 20.3 is closed and the sixth reversing valve 20.6 is opened, the fourth pressure regulating valve 20.4 can be adjusted so that the upward thrust of the first cylinder 10 is slightly smaller than the gravity of the device body, and the corresponding action Slowly descend for the sliding seat 12;

The second cylinder 19 is a double-acting cylinder, and the stroke of the cylinder determines the angle of rotation of the connecting rod mechanism 13, and the retraction of the cylinder corresponds to the recovery state of the device, as shown in Figure 3; the release of the cylinder corresponds to the connection and sealing state of the device, as shown in Figure 3. 4 shown;

The method for injecting and circulating drilling fluid for tripping strings of the present invention is as follows:

Step a. Fix the main body of the drilling fluid injection and circulation device for lifting and lowering pipe strings on the lifting ring of the drilling rig through fasteners such as U-shaped bolts, and connect the drilling fluid pipeline and the control gas pipeline of the motor and cylinder;

Step b. During the operation of drilling and tripping the pipe string, when the drilling fluid needs to be poured and circulated, the two driving cylinders are respectively operated through the control system to push the connecting joint to swing to the wellhead position and drop to the top of the pipe string held by the elevator;

Step c. The control system operates the motor to rotate in the forward direction, and the reduction box drives the connecting joint and the pipe string to quickly turn the buckle. At this time, the connection seal contacts the end surface of the pipe string and a certain amount of compression occurs, resulting in a sealing effect. At this time, the grouting valve of the drilling rig can be opened, and the drilling fluid can be injected and circulated as required;

Step d. When the injection or circulation of drilling fluid is finished, close the grouting valve of the drilling rig, operate the motor to reverse rotation through the control system, and connect the joint and the pipe string for quick release;

Step e. Operate the driving cylinder through the control system, push the connecting joint to move upwards and swing to the outside of the elevator, leaving room for the operation of the pipe string, without interfering with the normal lifting and lowering of the pipe string. At this time, the normal lifting and lowering of the pipe string can be carried out Operation;

Steps b to e are repeated until the injection and circulation of the drilling fluid in all tripping and tripping operations are completed.

Embodiment 2: as shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, and Figure 6,

The utility model relates to a drilling fluid injection and circulation device for tripping strings, which is applied in the technical field of oil and gas drilling. The device is composed of a motor, a reduction box, a connection seal, a connection joint, a drilling fluid pipeline, a connecting rod mechanism, a cylinder, a drive shaft and a control system. The feature is: the drilling fluid injection and circulation device for tripping the pipe string can be installed on the lifting ring of the drilling rig; when drilling fluid injection and circulation are required during the tripping pipe string operation, the cylinder is operated by the control system to push the connecting joint to rotate to the elevator Above the clamped pipe string; the starter motor rotates in the forward direction, and the connection joint and the pipe string are quickly twisted through the reduction box; the connection seal is installed on the connection joint; the connection seal contacts the end surface/thread shoulder surface of the pipe string and A certain amount of compression occurs to produce a sealing effect; the grouting valve of the drilling rig is opened to inject and circulate the drilling fluid as required; the motor is operated to reverse rotation through the control system, and the connecting joint and the pipe string are quickly released; the drive cylinder is operated through the control system, Push the connecting joint to swing to the outside of the elevator to leave a working space, and the device will not interfere with the normal lifting and lowering of the pipe string. At this time, the normal lifting and lowering of the pipe string can be performed. The effect is: the use of the device and method realizes the rapid connection of the drilling fluid circulation pipeline and the wellhead pipe string during the drilling and tripping process, eliminating the need for frequent kelly connection and unloading operations due to drilling fluid injection and circulation, Improve the safety and production efficiency of the drilling rig, reduce non-productive time, and avoid or reduce the occurrence of obstruction or jamming accidents during tripping and tripping.

The main components of the drilling fluid injection and circulation device for lifting and lowering pipe strings of the present invention include: 1-motor, 2-reduction box, 3-connection seal, 4-connection joint, 5-drive shaft, 9-rail seat, 10-cylinder, and 20-Control system etc.

The drilling fluid injection and circulation device for tripping strings is installed on the lifting ring 8 of the drilling rig through ear sockets 15 and U-shaped bolts 16 , and its installation height can be adjusted through the U-shaped bolts 16 . The motor 1 is installed at the input end of the reduction box 2, and the inside of the reduction box is a conventional one-stage spur gear reduction mechanism; the connection joint 4 is connected with the output end of the reduction box 2 through threads, and the connection joint 4 is equipped with a connection seal 3, which is used for lifting and lowering the pipe. The column drilling fluid injection and circulation device is connected and sealed with the pipe string 7 through the connection joint 4 and the connection seal 3; the pipeline connection mechanism 18 can be a flushing pipe packing structure similar to that used in the top drive drilling device in the drilling equipment. The upper end is the drilling fluid circulation pipeline interface 17, and the lower end is connected with the connecting joint 4 through threads to form a channel for drilling fluid circulation; the driving first cylinder 10 is connected with the sliding seat 12 through the pin shaft 11, and the sliding seat 12 can move up and down along the guide rail 14 The connecting rod mechanism 13 is connected with the slide seat through the fifth pin shaft 13.5 and the sixth pin shaft 13.6; Six pin shafts 13.6 etc.; Drive shaft 5 is the pin shaft of link mechanism 13, and its lower end is connected with reduction box 2 casings by spline, promotes reduction box 2 and link mechanism 13 synchronous motions.

As mentioned above, although the Example of this invention was demonstrated in detail, it is obvious to those skilled in the art that many modifications can be made as long as the inventive point and effect of this invention are not substantially deviated. Therefore, all such modified examples are also included in the protection scope of the present invention.

Claims (3)

1. A drilling fluid injection and circulation device for tripping strings, characterized in that the lugs and U-shaped bolts are fixed on the lifting ring of the drilling rig, and the installation position should be determined according to the end face of the string clamped in the elevator. The position should be about 130mm-150mm higher than the end face of the pipe string; the lug seat and U-bolt should be matched according to the lifting rings of different specifications used by the drilling rig; The motor is installed at the input end of the reduction box, and the inside of the reduction box is a gear reduction mechanism, and the appropriate output torque and output speed are obtained through deceleration; The connecting joint is connected to the output end of the reduction box, and the connecting joint is equipped with a connecting seal, and the drilling fluid injection and circulation device for pulling out the pipe string is connected and sealed with the pipe string through the connecting joint and the connecting seal; The connection seal can be installed on the connection joint through the sealing pressure block, screw, etc.; The upper end of the pipeline connection mechanism is the drilling fluid circulation pipeline interface, and the lower end of the pipeline connection mechanism is connected with the connection joint to form a channel for drilling fluid circulation; the connection joint is a rotating part; The first cylinder is connected with the sliding seat through the pin shaft, driving the first cylinder can drive the sliding seat to move up and down along the guide rail; the connecting rod mechanism is connected with the sliding seat through the fifth pin shaft and the sixth pin shaft; the connecting rod mechanism includes the first connecting rod , the second connecting rod, the third connecting rod, the drive shaft, the drive cylinder, the fifth pin shaft, and the sixth pin shaft; One end of the second cylinder is connected to the sliding seat through the seventh pin shaft, and the other end is connected to the linkage mechanism through the fourth pin shaft, and the second cylinder pushes the linkage mechanism to rotate; The drive shaft is the rotating shaft of the link mechanism, and its lower end is connected with the box body of the reduction box to push the reduction box and the link mechanism to move synchronously; The control system consists of the original air source processing unit, the second pressure gauge, the pressure bypass valve, the fourth pressure regulating valve, the fifth pressure gauge, the sixth reversing valve, the seventh reversing valve, the eighth reversing valve, the ninth pressure Table, the composition of the tenth pressure regulating valve; The tenth pressure regulating valve, the ninth pressure gauge and the eighth reversing valve are respectively installed on the control pipeline of the motor, and the forward and reverse rotation of the motor is realized by controlling the eighth reversing valve; The first cylinder is a single-acting cylinder, connected to the air source pipeline at the upper end of the cylinder, and the lower side of the cylinder is open to the atmosphere; when the pressure bypass valve and the sixth reversing valve are opened, the upper end of the cylinder is connected to the air source pressure, and the corresponding action is to push the slide The seat moves upward; when the pressure bypass valve is closed and the sixth reversing valve is opened, the fourth pressure regulating valve can be adjusted so that the upward thrust of the first cylinder is slightly smaller than the gravity of the device body, and the corresponding action is that the slide seat slowly descends; The second cylinder is a double-acting cylinder, and the stroke of the cylinder determines the rotation angle of the connecting rod mechanism. The retraction of the cylinder corresponds to the recovery state of the device; the release of the cylinder corresponds to the connection and sealing state of the device. 2. A drilling fluid injection and circulation device for tripping pipe strings according to claim 1, characterized in that when the pipe string held by the elevator is above the pipe string, the control system starts the motor to rotate forward, and the reduction box drives the connecting joint and The pipe string is quickly twisted; the connection seal is installed on the connection joint; the connection seal is in contact with the end face of the pipe string and a certain amount of compression occurs; The connecting joint and the pipe string are quickly released by rotating in the opposite direction; the first cylinder and the second cylinder are driven by the control system to push the connecting joint to move upward and swing to the outside of the elevator. 3. A drilling fluid injection and circulation method for tripping strings, characterized in that: Step 1. Fix the main body of the drilling fluid injection and circulation device for lifting and lowering pipe strings on the lifting ring of the drilling rig through fasteners such as U-shaped bolts, and connect the drilling fluid pipeline and the control gas pipeline of the motor and cylinder; Step 2. During the operation of drilling and tripping the pipe string, when the drilling fluid needs to be poured and circulated, the two drive cylinders are respectively operated through the control system to push the connecting joint to swing to the wellhead position and descend to the top of the pipe string held by the elevator; Step 3. Operate the motor to rotate in the forward direction through the control system, and drive the connecting joint and the pipe string to quickly turn the buckle through the reduction box. At this time, the connection seal contacts the end surface of the pipe string and a certain amount of compression occurs to produce a sealing effect. At this time, the grouting valve of the drilling rig can be opened, and the drilling fluid can be injected and circulated as required; Step 4. When the injection or circulation of drilling fluid is finished, close the grouting valve of the drilling rig, operate the motor to reverse rotation through the control system, and connect the joint and the pipe string for quick release; Step 5. Operate the driving cylinder through the control system, push the connecting joint to move upwards and swing to the outside of the elevator, leaving space for the pipe string to work without interfering with the normal lifting and lowering of the pipe string. At this time, the normal lifting and lowering of the pipe string can be carried out Operation; Repeat steps 2 to 5 until the injection and circulation of drilling fluid in all tripping and tripping operations are completed.