A downhole working condition simulation device for pressure control drilling experiment and test

Abstract

The utility model discloses a kind of downhole working condition simulation devices for pressure control drilling experiment and test, including support, driving motor and test motor, driving motor and test motor are sequentially installed from top to bottom on support, driving motor and test motor are sequentially installed from top to bottom with upper mass simulator, elastic steel wire rope and lower mass simulator between them, lower mass simulator includes shell and rotating component, first loading disc, second loading disc and third loading disc are sequentially arranged from bottom to top inside shell, and locking component is arranged between;First loading disc is fixedly installed in shell interior, and the lower end of elastic steel wire rope is fixedly connected with upper end;Second loading disc and third loading disc are rotatably installed on the inner wall of shell by rotating component.The rotating component and locking component can control whether second loading disc and third loading disc rotate following first loading disc, change drill bit intensity in experimental process, increase the working condition simulation of pressure control drilling experiment and test.

Description

Technical Field

[0001] This utility model relates to the field of drilling testing technology, specifically a downhole working condition simulation device for controlled pressure drilling experiments and tests. Background Technology

[0002] Controlled pressure drilling (CPD) is a precise downhole pressure control technology that ensures accurate downhole pressure control throughout the entire drilling operation, including normal drilling, single-joint drilling, and tripping operations. This reduces various drilling complications such as well kicks and lost circulation. Compared to conventional drilling techniques, it can reduce downhole complexity by 80%, reduce non-productive time by 20%–40%, and lower drilling costs. Before implementing CPD, a thorough analysis of the various operating conditions is necessary. During CPD, variations in well depth and underground geology, friction between the drill bit and the wellbore, and elastic deformation of the drill pipe create complex downhole conditions. Currently, there is no effective method to simulate all these conditions during drilling.

[0003] For example, utility model patent application number CN201220565682.7 discloses a drilling rig downhole working condition simulation test frame, including a frame body, a main motor, a servo motor, and a mass block simulation unit; the main motor and the servo motor are respectively located at the top and bottom of the frame body; the main motor is connected to the servo motor through the mass block simulation unit. This drilling rig downhole working condition simulation test frame provides a drilling rig downhole working condition simulation test frame that can simulate various downhole working conditions in the actual drilling process, is highly adaptable, has a simple structure, and is easy to operate.

[0004] Although this drilling rig downhole condition simulation test rack can simulate various downhole conditions in actual drilling processes, and is highly adaptable, simple in structure, and easy to operate, in actual drilling processes, drilling bits are designed to correspond to the hardness of the geological layers. When the geological hardness varies, different strengths of drill bits are required. However, the aforementioned drilling rig downhole condition simulation test rack cannot change the strength of the drill bit, and therefore lacks practicality in testing under different rotary table speeds, different well depths, and different frictional forces and other viscous resistances. Further improvements are needed. Utility Model Content

[0005] The purpose of this invention is to provide a downhole working condition simulation device for controlled pressure drilling experiments and tests. It aims to improve the practicality of testing under different conditions, such as different rotary table speeds, different well depths, and different friction and other viscous resistances, because drilling bits are designed to be used according to the hardness of the geological layer. This is because different strengths of drill bits are required when the geological hardness varies, and the strength of the drill bit cannot be changed. This is a problem that needs further improvement.

[0006] This utility model is implemented as follows: A downhole working condition simulation device for controlled pressure drilling experiments and tests includes a support, a drive motor, and a test motor. The drive motor and the test motor are installed sequentially from top to bottom on the support. Between the drive motor and the test motor, an upper mass simulator, an elastic steel wire rope, and a lower mass simulator are installed sequentially from top to bottom. The lower mass simulator includes a shell and a rotating component. Inside the shell, a first loading disk, a second loading disk, and a third loading disk are arranged sequentially from bottom to top, and a locking component is provided between them. The first loading disk is fixedly installed inside the shell, and its upper end is fixedly connected to the lower end of the elastic steel wire rope. The second and third loading disks are rotatably installed on the inner wall of the shell through the rotating component.

[0007] Preferably, the bracket is a triangular bracket, with a top mounting bracket fixedly installed at the upper end of the bracket, and the drive motor fixedly installed on the top mounting bracket. The output shaft of the drive motor passes through the top mounting bracket and connects to the upper mass simulator. A guide rail component is fixedly installed at the lower end of the bracket, and a bottom mounting bracket is slidably installed on the guide rail component. A test motor is fixedly installed on the bottom mounting bracket. The test motor and the drive motor are coaxially opposite each other, and the upper end of the output shaft of the test motor is connected to the bottom of the first loading disk in the lower mass simulator. The central axes of the upper mass simulator and the lower mass simulator are vertically aligned.

[0008] Preferably, an electric telescopic rod is fixedly installed at the lower end of the bottom mounting bracket, and the lower end of the electric telescopic rod is fixedly installed on the bracket; the test motor includes a spline shaft, and a keyway is provided at the bottom of the first loading disk; the lower end of the spline shaft is fixedly connected to the output shaft of the test motor, and the upper end of the spline shaft is installed in the keyway.

[0009] Preferably, the lower mass simulator is provided with a central hole, which extends from the upper surface of the shell to the upper end of the first loading disk, and the lower end of the elastic steel wire rope is fixedly connected to the upper end of the first loading disk through the central hole.

[0010] Preferably, the second and third loading disks are each provided with annular grooves on their sides, and the housing is provided with a bearing groove at the position corresponding to the annular groove; the rotating component is installed in both the bearing groove and the annular groove, and the locking component is installed in the annular groove.

[0011] Preferably, the rotating component includes an outer shaft ring, an inner shaft ring, rollers, and a convex ring. The outer shaft ring is fixedly installed in the bearing groove, and the inner shaft ring is fitted into the annular groove by the convex ring. The outer shaft ring and the inner shaft ring are installed by the rotational engagement of the rollers.

[0012] Preferably, the locking component includes a first annular electromagnet, a second annular electromagnet, and a spring; the first annular electromagnet is fixedly installed at the upper end of the annular groove, the second annular electromagnet is fixedly installed at the upper end of the convex ring and is installed opposite to the first annular electromagnet, and a spring is fixedly installed between the first annular electromagnet and the second annular electromagnet.

[0013] Preferably, it also includes multiple locking rods and locking holes. Multiple locking rods are sequentially installed along the circumference of the lower part of the second loading plate and the third loading plate. Matching locking holes are provided on the upper part of the first loading plate and the second loading plate, corresponding to the positions of the adjacent locking rods. Buffer pads are fixed on the contact surfaces of the first loading plate, the second loading plate and the third loading plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, by setting a first loading disk, a second loading disk, a third loading disk, a rotating component, and a locking component, can control whether the second and third loading disks rotate with the first loading disk, thereby changing the drill bit strength during the experiment. It is used for testing different rotary table speeds, different well depths, and different friction forces and other viscous resistances, increasing the practicality of pressure controlled drilling experiments and downhole working condition simulation.

[0016] 2. This utility model, by setting a guide rail component and an electric telescopic rod, can control the tension and length of the elastic steel wire rope, and can be used to simulate the length of different drill rods. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a front structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the lower mass simulator of this utility model;

[0020] Figure 4 This is a cross-sectional structural diagram of the lower mass simulator of this utility model;

[0021] Figure 5 This is a utility model Figure 4 Schematic diagram of the structure at point A;

[0022] Figure 6 This is a schematic diagram of the upper structure of the second loading disk of this utility model;

[0023] Figure 7 This is a schematic diagram of the lower end structure of the second loading disk of this utility model.

[0024] In the diagram: 1. Bracket; 2. Top mounting bracket; 3. Drive motor; 4. Upper mass simulator; 5. Elastic steel wire rope; 6. Guide rail component; 61. Slide rail; 62. Electric telescopic rod; 7. Bottom mounting bracket; 8. Test motor; 81. Splined shaft; 9. Lower mass simulator; 91. Housing; 911. Center hole; 912. Bearing groove; 92. First loading plate; 921. Keyway; 93. Second loading plate; 931. Buffer pad; 932. Annular groove; 94. Third loading plate; 95. Rotating component; 951. Outer shaft ring; 952. Inner shaft ring; 953. Roller; 954. Convex ring; 96. Locking component; 961. First annular electromagnet; 962. Second annular electromagnet; 963. Spring; 97. Locking rod; 98. Lock hole. Detailed implementation method:

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0027] Example 1

[0028] like Figures 1-3 As shown, a downhole working condition simulation device for controlled pressure drilling experiments and tests includes a support 1, a drive motor 3, and a test motor 8. The drive motor 3 and test motor 8 are mounted sequentially from top to bottom on the support 1, aligned vertically. Between the drive motor 3 and test motor 8, from top to bottom, are an upper mass simulator 4, an elastic steel wire rope 5, and a lower mass simulator 9. The support 1 is a triangular support, with a top mounting bracket 2 fixedly mounted on its upper end. The drive motor 3 is fixedly mounted on the top mounting bracket 2. The drive motor 3's output... The output shaft passes vertically downward through the top mounting bracket 2 and is connected to the upper mass simulator 4; the lower end of the bracket 1 is fixedly mounted with a guide rail component 6, and a bottom mounting bracket 7 is slidably mounted on the guide rail component 6. A test motor 8 is fixedly mounted on the bottom mounting bracket 7, and the output shaft of the test motor 8 is set upward. The test motor 8 and the drive motor 3 are coaxially opposite each other; the lower mass simulator 9 includes a housing 91 and a rotating component 95. The housing 91 has a first loading plate 92, a second loading plate 93 and a third loading plate 94 arranged sequentially from bottom to top, and a locking component 96 is arranged between them.

[0029] like Figure 2 and Figure 3 As shown, the first loading disk 92 is fixedly installed inside the housing 91, and its upper end is fixedly connected to the lower end of the elastic steel wire rope 5; the lower mass simulator 9 is provided with a central hole 911, the diameter of which is larger than the diameter of the elastic steel wire rope 5. The central hole 911 extends from the upper surface of the housing 91 to the upper end of the first loading disk 92, and the lower end of the elastic steel wire rope 5 is fixedly connected to the upper end of the first loading disk 92 through the central hole 911; the upper end of the output shaft of the test motor 8 is connected to the bottom of the first loading disk 92 in the lower mass simulator 9; the upper mass simulator 4 and the lower mass simulator 9 The central axis is vertically aligned; an electric telescopic rod 62 is fixedly installed at the lower end of the bottom mounting bracket 7, and the lower end of the electric telescopic rod 62 is fixedly installed on the bracket 1. The bottom mounting bracket 7 can be moved up and down by the electric telescopic rod 62 to adjust the length of the elastic steel wire rope 5; the test motor 8 includes a spline shaft 81, and a keyway 921 is provided at the bottom of the first loading plate 92; the lower end of the spline shaft 81 is fixedly connected to the output shaft of the test motor 8, and the upper end of the spline shaft 81 is installed in the keyway 921; the second loading plate 93 and the third loading plate 94 are rotatably installed on the inner wall of the housing 91 through the rotating component 95.

[0030] like Figures 4-7 As shown, the second loading disk 93 and the third loading disk 94 are each provided with annular grooves 932 on their sides, and the housing 91 is provided with bearing grooves 912 corresponding to the positions of the annular grooves 932; the rotating component 95 is installed in both the bearing grooves 912 and the annular grooves 932, and the locking component 96 is installed in the annular grooves 932; the rotating component 95 includes an outer shaft ring 951, an inner shaft ring 952, a roller 953 and a convex ring 954, the outer shaft ring 951 is fixedly installed in the bearing groove 912, the inner shaft ring 952 is fitted in the annular groove 932 through the convex ring 954, and the outer shaft ring 951 and the inner shaft ring 952 are rotatably fitted by the roller 953; the locking component 96 includes a first annular electromagnet 961, a second annular electromagnet 962 and a... A spring 963; a first annular electromagnet 961 is fixedly installed at the upper end of an annular groove 932, and a second annular electromagnet 962 is fixedly installed at the upper end of a convex ring 954 and is installed opposite to the first annular electromagnet 961. A spring 963 is fixedly installed between the first annular electromagnet 961 and the second annular electromagnet 962; it also includes multiple locking rods 97 and locking holes 98. Multiple locking rods 97 are installed sequentially along the circumference of the lower part of the second loading plate 93 and the third loading plate 94. The upper part of the first loading plate 92 and the second loading plate 93 are provided with matching locking holes 98 corresponding to the positions of the adjacent locking rods 97; buffer pads 931 are fixed on the contact surfaces of the first loading plate 92, the second loading plate 93 and the third loading plate 94.

[0031] Example 2

[0032] like Figures 1-3 As shown, a downhole working condition simulation device for controlled pressure drilling experiments and tests includes a support 1, a drive motor 3, and a test motor 8. The drive motor 3 and the test motor 8 are installed sequentially from top to bottom on the support 1. Between the drive motor 3 and the test motor 8, an upper mass simulator 4, an elastic steel wire rope 5, and a lower mass simulator 9 are installed sequentially from top to bottom. The support 1 is a triangular support. A top mounting bracket 2 is fixedly installed on the upper end of the support 1. The drive motor 3 is fixedly installed on the top mounting bracket 2. The output shaft of the drive motor 3 passes through the top mounting bracket 2 and is connected to the upper mass simulator 4. A guide rail component 6 is fixedly installed on the lower end of the support 1. A bottom mounting bracket 7 is slidably installed on the guide rail component 6. The test motor 8 is fixedly installed on the bottom mounting bracket 7. The test motor 8 and the drive motor 3 are coaxially opposite each other. The lower mass simulator 9 includes a housing 91 and a rotating component 95. Inside the housing 91, a first loading disk 92, a second loading disk 93, and a third loading disk 94 are arranged sequentially from bottom to top, and a locking component 96 is provided between them.

[0033] like Figure 2 and Figure 3 As shown, the first loading disk 92 is fixedly installed inside the housing 91, and the lower end of the elastic steel wire rope 5 is fixedly connected to its upper end; the lower mass simulator 9 is provided with a central hole 911, which extends from the upper surface of the housing 91 to the upper end of the first loading disk 92, and the lower end of the elastic steel wire rope 5 is fixedly connected to the upper end of the first loading disk 92 through the central hole 911; the upper end of the output shaft of the test motor 8 is connected to the bottom of the first loading disk 92 in the lower mass simulator 9; the central axes of the upper mass simulator 4 and the lower mass simulator 9 are vertically aligned; the lower end of the bottom mounting bracket 7 is fixedly installed with an electric telescopic rod 62, and the lower end of the electric telescopic rod 62 is fixedly installed on the bracket 1; the test motor 8 includes a spline shaft 81, and the bottom of the first loading disk 92 is provided with a keyway 921; the lower end of the spline shaft 81 is fixedly connected to the output shaft of the test motor 8, and the upper end of the spline shaft 81 is installed in the keyway 921; the second loading disk 93 and the third loading disk 94 are rotatably installed on the inner wall of the housing 91 through a rotating component 95.

[0034] like Figures 4-7As shown, the second loading disk 93 and the third loading disk 94 are each provided with annular grooves 932 on their sides, and the housing 91 is provided with bearing grooves 912 corresponding to the positions of the annular grooves 932; the rotating component 95 is installed in both the bearing grooves 912 and the annular grooves 932, and the locking component 96 is installed in the annular grooves 932; the rotating component 95 includes an outer shaft ring 951, an inner shaft ring 952, a roller 953 and a convex ring 954, the outer shaft ring 951 is fixedly installed in the bearing groove 912, the inner shaft ring 952 is fitted in the annular groove 932 through the convex ring 954, and the outer shaft ring 951 and the inner shaft ring 952 are rotatably fitted by the roller 953; the locking component 96 includes a first annular electromagnet 961, a second annular electromagnet 962 and a... A spring 963; a first annular electromagnet 961 is fixedly installed at the upper end of an annular groove 932, and a second annular electromagnet 962 is fixedly installed at the upper end of a convex ring 954 and is installed opposite to the first annular electromagnet 961. A spring 963 is fixedly installed between the first annular electromagnet 961 and the second annular electromagnet 962; it also includes multiple locking rods 97 and locking holes 98. Multiple locking rods 97 are installed sequentially along the circumference of the lower part of the second loading plate 93 and the third loading plate 94. The upper part of the first loading plate 92 and the second loading plate 93 are provided with matching locking holes 98 corresponding to the positions of the adjacent locking rods 97; buffer pads 931 are fixed on the contact surfaces of the first loading plate 92, the second loading plate 93 and the third loading plate 94.

[0035] The working principle of this utility model is as follows: When conducting controlled pressure drilling experiments and simulating downhole working conditions, energizing the locking component 96 on the outer side of the second loading disk 93 causes the first annular electromagnet 961 and the second annular electromagnet 962 to generate magnetic force, overcoming the elastic force of the spring 963. This causes the second loading disk 93 to descend, gradually bringing the locking rod 97 at the top of the first loading disk 92 into contact with the bottom surface of the second loading disk 93. Through the arc-shaped structure of the top of the locking rod 97 and the bottom opening of the locking hole 98, the locking rod 97 can automatically slide into the locking hole 98, completing the self-locking of the first loading disk 92 and the second loading disk 93. This allows the first loading disk 92 to rotate... During the process, the second loading disk 93 needs to be rotated synchronously, which increases the load of the simulation test. Then, following the above procedure, three working conditions of another drill bit under enhanced load in actual drilling are simulated: different rotary table speeds, different well depths, and different friction forces and other viscous resistances. When conducting controlled-pressure drilling experiments and testing downhole working condition simulations for a stronger drill bit, a third loading disk 94 can be added as a load in the same way as above. Following the above procedure, three working conditions of the drill bit under enhanced load in actual drilling are simulated: different rotary table speeds, different well depths, and different friction forces and other viscous resistances.

[0036] In summary, this utility model, by setting up a first loading disk 92, a second loading disk 93, a third loading disk 94, a rotating component 95, and a locking component 96, allows control over whether the second loading disk 93 and the third loading disk 94 rotate with the first loading disk 92, thereby changing the drill bit strength during the experiment. This enables testing of different rotary table speeds, different well depths, and different frictional forces and other viscous resistances, increasing the practicality of controlled-pressure drilling experiments and downhole condition simulations. Furthermore, by setting up a guide rail component 6 and an electric telescopic rod 62, the tension and length of the elastic wire rope 5 can be controlled, which can be used to simulate different drill pipe lengths.

[0037] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A downhole working condition simulation device for controlled pressure drilling experiments and tests, comprising a support (1), a drive motor (3), and a test motor (8), wherein the drive motor (3) and the test motor (8) are sequentially mounted on the support (1) from top to bottom, and an upper mass simulator (4), an elastic steel wire rope (5), and a lower mass simulator (9) are sequentially mounted between the drive motor (3) and the test motor (8) from top to bottom, characterized in that, The lower mass simulator (9) includes a housing (91) and a rotating component (95). Inside the housing (91), a first loading disk (92), a second loading disk (93), and a third loading disk (94) are arranged sequentially from bottom to top, and a locking component (96) is arranged between them. The first loading disk (92) is fixedly installed inside the housing (91), and the lower end of the elastic steel wire rope (5) is fixedly connected to its upper end. The second loading disk (93) and the third loading disk (94) are rotatably installed on the inner wall of the housing (91) through the rotating component (95).

2. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 1, characterized in that, The bracket (1) is a triangular bracket. A top mounting bracket (2) is fixedly installed on the upper end of the bracket (1). The drive motor (3) is fixedly installed on the top mounting bracket (2). The output shaft of the drive motor (3) passes through the top mounting bracket (2) and is connected to the upper mass simulator (4). A guide rail component (6) is fixedly installed on the lower end of the bracket (1). A bottom mounting bracket (7) is slidably installed on the guide rail component (6). A test motor (8) is fixedly installed on the bottom mounting bracket (7). The test motor (8) and the drive motor (3) are coaxially opposite each other. The upper end of the output shaft of the test motor (8) is connected to the bottom of the first loading disk (92) in the lower mass simulator (9). The central axes of the upper mass simulator (4) and the lower mass simulator (9) are vertically aligned.

3. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 2, characterized in that, An electric telescopic rod (62) is fixedly installed at the lower end of the bottom mounting bracket (7), and the lower end of the electric telescopic rod (62) is fixedly installed on the bracket (1); the test motor (8) includes a spline shaft (81), and a keyway (921) is provided at the bottom of the first loading disk (92); the lower end of the spline shaft (81) is fixedly connected to the output shaft of the test motor (8), and the upper end of the spline shaft (81) is installed in the keyway (921).

4. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 1, characterized in that, The lower mass simulator (9) is provided with a central hole (911), which extends from the upper surface of the housing (91) to the upper end of the first loading disk (92). The lower end of the elastic steel wire rope (5) is fixedly connected to the upper end of the first loading disk (92) through the central hole (911).

5. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 1, characterized in that, The second loading disk (93) and the third loading disk (94) are provided with annular grooves (932) on their sides. The housing (91) is provided with a bearing groove (912) corresponding to the position of the annular groove (932). The rotating component (95) is installed in both the bearing groove (912) and the annular groove (932). The locking component (96) is installed in the annular groove (932).

6. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 5, characterized in that, The rotating component (95) includes an outer shaft ring (951), an inner shaft ring (952), a roller (953), and a convex ring (954). The outer shaft ring (951) is fixedly installed in the bearing groove (912). The inner shaft ring (952) is fitted in the annular groove (932) through the convex ring (954). The outer shaft ring (951) and the inner shaft ring (952) are rotatably fitted together by the roller (953).

7. A downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 5, characterized in that, The locking component (96) includes a first annular electromagnet (961), a second annular electromagnet (962), and a spring (963); the first annular electromagnet (961) is fixedly installed on the upper end of the annular groove (932), the second annular electromagnet (962) is fixedly installed on the upper end of the convex ring (954) and is installed opposite to the first annular electromagnet (961), and a spring (963) is fixedly installed between the first annular electromagnet (961) and the second annular electromagnet (962).

8. The downhole operating condition simulation device for controlled pressure drilling experiments and tests according to claim 1, characterized in that, In addition, it includes multiple locking rods (97) and locking holes (98). Multiple locking rods (97) are installed sequentially along the circumference of the second loading plate (93) and the third loading plate (94). The first loading plate (92) and the second loading plate (93) are provided with matching locking holes (98) at the positions of the adjacent locking rods (97). Buffer pads (931) are fixed on the contact surfaces of the first loading plate (92), the second loading plate (93) and the third loading plate (94).

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