Seal testing device for marine drilling riser

Abstract

The invention discloses a marine drilling riser sealing test device which comprises a hydraulic drive sealing test unit, and the lower portion of the hydraulic drive sealing test unit is connected with a hydraulic drive riser supporting unit. The problems of difficulty in centering and frequent disassembly of a plurality of parts in the operation process of the marine riser during the sealing test in the prior art are solved. The problems that when a riser is hoisted and moved in a traditional method, a riser feeding tool pressure test cap is connected with a riser side pipe in a centering mode, the riser feeding tool installs and disassembles the side pipe pressure test cap before and after a sealing test, and the riser feeding tool is connected with a riser string main pipe connector in a centering mode during the sealing test can be avoided. During a marine riser side pipe sealing test, the marine riser feeding tool can continuously hoist a single marine riser, so that the centering connection difficulty of the marine riser feeding tool and the marine riser is reduced, the connection efficiency is improved, the lowering speed of a marine riser string is accelerated, and the labor intensity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling and production equipment, and particularly relates to an offshore drilling riser sealing test device. Background Art

[0002] During the process of lowering the marine drilling riser string, it is necessary to conduct a seal test on the side pipes of the already connected drilling riser string. The seal test uses a riser running tool. This riser running tool has the functions of connecting and locking the riser, lifting and moving the riser, and lowering and retrieving the riser. And it is usually equipped with a side pipe pressure test cap that is easy to disassemble and install. After the riser running tool installs the side pipe pressure test cap, it can conduct a seal test on the side pipes of the riser. Specifically, the following two methods are adopted. 1. Pre-install the pressure test cap onto the riser running tool. Align the riser running tool with the single pipe of the riser on the riser catwalk, including aligning the riser running tool with the main body joint of the single pipe of the riser and aligning multiple pressure test caps of the riser running tool with multiple side pipes of the single pipe of the riser. After the above alignment, connect and lock the riser running tool with the single pipe of the riser. The riser running tool lifts and moves the single pipe of the riser to the riser chuck and connects it with the riser string sitting on the riser chuck. After the lifted single pipe of the riser is connected to the riser string, open the riser chuck. The riser running tool lifts and moves the riser string down by the length of one riser, close the riser chuck, and seat the riser string on the riser chuck. The riser running tool disconnects from the riser string and continues to lift and move the single pipe of the riser and connect it with the riser string according to the above steps. Usually, after every 3 - 5 newly connected risers, conduct a seal test on the side pipes of the drilling riser string. Seat the riser string on the riser chuck, keep the riser running tool connected to the riser string, connect the pressure source to the pressure test cap of the riser running tool, boost the pressure, and stabilize the pressure to complete the seal test on the side pipes of the drilling riser string. 2. When lifting and moving the single pipe of the riser, remove the pressure test cap from the riser running tool. Align and lock the riser running tool with the main body joint of the single pipe of the riser on the riser catwalk. The riser running tool lifts and moves the single pipe of the riser to the riser chuck and connects it with the riser string sitting on the riser chuck. After the lifted single pipe of the riser is connected to the riser string, open the riser chuck. The riser running tool lifts and moves the riser string down by the length of one riser, close the riser chuck, and seat the riser string on the riser chuck. The riser running tool disconnects from the riser string and continues to lift and move the single pipe of the riser and connect it with the riser according to the above steps. Usually, after every 3 - 5 connected risers, conduct a seal test on the side pipes of the drilling riser string. Seat the riser string on the riser chuck, disconnect the riser running tool from the drilling riser string. After installing the pressure test cap onto the riser running tool, align the riser running tool with the drilling riser string, including aligning the riser running tool with the main body joint of the single pipe of the riser and aligning multiple pressure test caps of the riser running tool with multiple side pipes of the single pipe of the riser. After the riser running tool is locked with the drilling riser string, connect the pressure source to the pressure test cap of the riser running tool, boost the pressure, and stabilize the pressure to complete the seal test on the side pipes of the drilling riser string.

[0003] For the first method, when the riser running tool is connected to each single joint of the riser, it is necessary to align the riser running tool with the main body joint of the single riser joint and align multiple pressure test caps of the riser running tool with multiple side pipes of the single riser joint, which is difficult and time-consuming. Especially for the flange-type single riser joint, for the mechanical riser running tool, it is also necessary to ensure the alignment of multiple bolts and nuts of the riser running tool. For the second method, although when the riser running tool is connected to each single joint of the riser, it only needs to align the riser running tool with the main body joint of the single riser joint, but when testing the seal of the side pipes of the drilling riser string each time, it is necessary to first disconnect the connection between the riser running tool and the drilling riser string, install multiple pressure test caps, and then align the riser running tool with the main body joint of the single riser joint and align multiple pressure test caps of the riser running tool with the side pipes of the single riser joint, which also has the problem of being time-consuming and laborious. When testing the seal of the side pipes of the riser string using the first method and the second method, not only is it necessary to align, connect, and lock the riser running tool with the main body joint of the riser, but also it is necessary to align the pressure test caps of the riser running tool with multiple side pipes of the riser string, which is time-consuming and laborious. Summary of the Invention

[0004] The purpose of the present invention is to provide an offshore drilling riser seal test device, which solves the problems of difficult alignment and frequent disassembly of multiple components during the operation of the riser in the existing technology for seal testing.

[0005] The technical solution adopted by the present invention is: it includes a hydraulic-driven seal test unit, and a hydraulic-driven riser support unit is connected to the lower part of the hydraulic-driven seal test unit.

[0006] The characteristics of the technical solution of the present invention also lie in:

[0007] The hydraulic-driven seal test unit includes a pair of semi-circular rotating bases. Each inner ring surface of the semi-circular rotating base is provided with a ring groove. Corresponding grooves and protrusions are respectively provided at both ends of each semi-circular rotating base. The two semi-circular rotating bases are clamped through the grooves and protrusions and fixed by fixing pins. Each upper surface of the semi-circular rotating base is respectively provided with an inverted "T" - shaped guide rail groove. The two inverted "T" - shaped guide rail grooves are parallel to each other. I - shaped guide rails are respectively connected in the two inverted "T" - shaped guide rail grooves through bolts.

[0008] The hydraulic-driven seal test unit also includes a pair of parallel sliding plates. Each lower surface of the sliding plate is provided with a "T" - shaped guide rail groove. The "T" - shaped guide rail groove is slidably connected with the corresponding I - shaped guide rail. Each sliding plate and each semi-circular rotating base are connected through a number of first hydraulic cylinder assemblies. Each first hydraulic cylinder assembly is parallel to the I - shaped guide rail.

[0009] Each skateboard is provided with a semi-circular through hole. When two semi-circular through holes are closely attached, a circular hole is formed, and the axis of the circular hole coincides with the axis of the circular hole formed by two semi-circular rotating bases; several side pipe pressure test cap units are evenly arranged on the periphery of the semi-circular through hole.

[0010] The side pipe pressure test cap unit includes a mounting hole, which is composed of a first hole section, a second hole section and a third hole section. Ring grooves with the same diameter are respectively arranged in the first hole section and the second hole section of the mounting hole. Side pipe pressure test cap fixing pin holes are symmetrically arranged on both sides of the mounting hole. The side pipe pressure test cap fixing pin holes pass through the two ring grooves. The side pipe pressure test cap unit also includes a side pipe pressure test cap, which is composed of a first cylinder, a second cylinder and a third cylinder. A pressure test hole is arranged in the center of the side pipe pressure test cap. A side pipe joint is arranged at the bottom of the second cylinder of the side pipe pressure test cap. The side pipe joint is matched with the side pipe joint of the riser string. The first cylinder, the second cylinder and the third cylinder are respectively matched with the corresponding hole sections of the mounting hole. Two symmetrically distributed steps are fixedly connected to one end of the third cylinder close to the first cylinder. The width direction of each step is arc-shaped. The length of the step corresponds to the diameter of each ring groove. Pin holes corresponding to the side pipe pressure test cap fixing pin holes are arranged on the steps. A counterbore corresponding to the cross section formed by the two steps is also arranged in the mounting hole. The counterbore extends from the lower surface of the skateboard to the ring groove of the first hole section of the mounting hole. The longitudinal direction of the counterbore is perpendicular to the plane where the two side pipe pressure test cap fixing pin holes are located. The side pipe pressure test cap unit also includes a side pipe pressure test cap fixing pin, and the side pipe pressure test cap fixing pin penetrates into the side pipe pressure test cap fixing pin hole and the corresponding step of the side pipe pressure test cap.

[0011] The hydraulic-driven riser support unit includes an upper support disc and a lower support disc. An annular boss corresponding to the inner ring groove of a pair of semi-circular rotating bases is arranged on the top of the upper support disc, and the annular boss is sleeved in the ring groove; circular holes are arranged in the centers of the upper support disc and the lower support disc. A number of hydraulic telescopic arm units are arranged between the upper support disc and the lower support disc, and the number of hydraulic telescopic arm units is evenly distributed around the circular hole in a week; a connecting ring is connected to the lower surface of the lower support disc by means of threads.

[0012] The hydraulic telescopic arm unit includes a pair of vertical plates parallel to the radial direction of the circular hole. A hydraulic cylinder fixing plate is fixedly connected between the two vertical plates. A second hydraulic cylinder assembly is fixedly connected to the center of the hydraulic cylinder fixing plate. A telescopic arm is slidably connected between the two vertical plates. The cross section of one end of the telescopic arm close to the circular hole is trapezoidal. A rectangular groove is arranged at the end of the telescopic arm far from the circular hole. The hydraulic cylinder assembly passes through the rectangular groove and is fixedly connected to the telescopic arm. A number of through holes are arranged on each vertical plate along the direction parallel to the axis of the circular hole. Threaded holes corresponding to the through holes of the vertical plates are arranged on both the upper support disc and the lower support disc. Each vertical plate is connected between the upper support disc and the lower support disc by bolts passing through the corresponding through holes and the corresponding threaded holes.

[0013] The beneficial effects of the present invention are:

[0014] By using the marine drilling riser sealing test device and the sealing test method of the present invention, a riser running tool with only the function of connecting, locking and lifting the riser without a pressure test cap can be used to lift, lower and recover the riser string. It can avoid the centering connection between the pressure test cap of the riser running tool and the side pipe of the riser during the lifting and connection of the riser by the traditional method, the installation and disassembly of the side pipe pressure test cap on the riser running tool before and after the sealing test, and the centering connection between the riser running tool and the main pipe joint of the riser string during the sealing test. During the sealing test of the side pipe of the riser, the riser running tool can continue to lift and move a single riser, reducing the difficulty of centering connection between the riser running tool and the riser, improving the connection efficiency, accelerating the lowering speed of the riser string, and reducing the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the marine drilling riser sealing test device of the present invention;

[0016] Figure 2 is a schematic structural diagram of the hydraulic drive sealing test unit of the marine drilling riser sealing test device of the present invention;

[0017] Figure 3 is a top view of the hydraulic drive sealing test unit of the marine drilling riser sealing test device of the present invention;

[0018] Figure 4 is a schematic cross-sectional structural diagram of the installation hole of the side pipe pressure test cap unit of the marine drilling riser sealing test device of the present invention;

[0019] Figure 5 is a schematic structural diagram of the side pipe pressure test cap of the marine drilling riser sealing test device of the present invention;

[0020] Figure 6 is a schematic structural diagram of the cross-section where the side pipe pressure test cap unit of the marine drilling riser sealing test device of the present invention is located;

[0021] Figure 7 is a schematic installation diagram of the side pipe pressure test cap of the marine drilling riser sealing test device of the present invention;

[0022] Figure 8 is a schematic structural diagram of the hydraulic drive riser support unit of the marine drilling riser sealing test device of the present invention;

[0023] Figure 9 is a schematic structural diagram of the hydraulic telescopic arm unit of the marine drilling riser sealing test device of the present invention;

[0024] Figure 10 is a top view schematic structural diagram of the hydraulic drive riser support unit of the marine drilling riser sealing test device of the present invention.

[0025] In the figure: 1. Hydraulic-driven seal test unit; 101. Side pipe pressure test cap; 102. Slide plate; 103. First hydraulic cylinder assembly; 104. I-shaped guide rail; 105. Side pipe pressure test cap fixing pin; 106. Semi-circular rotating base; 107. Fixed pin shaft; 108. First cylinder; 109. Second cylinder; 110. Step; 111. Ring groove; 112. Mounting hole; 113. Third cylinder; 2. Hydraulic-driven riser support unit; 201. Upper support plate; 202. Lower support plate; 203. Connecting ring; 204. Second hydraulic cylinder assembly; 205. Telescopic arm; 206. Vertical plate; 207. Hydraulic cylinder fixing plate; 3. Riser string. Detailed implementation mode

[0026] The present invention will be described in detail below with reference to the accompanying drawings and the detailed implementation mode.

[0027] As Figure 1 described, the present invention provides an offshore drilling riser seal test device, which includes a hydraulic-driven seal test unit 1, and a hydraulic-driven riser support unit 2 is connected to the lower part of the hydraulic-driven seal test unit 1.

[0028] As Figure 2 and Figure 3 shown, the hydraulic-driven seal test unit 1 includes a pair of semi-circular rotating bases 106. A ring groove is provided on the inner circumferential surface of each semi-circular rotating base 106 for connecting with the hydraulic-driven riser support unit 2, and the semi-circular rotating base 106 can rotate around the hydraulic-driven riser support unit 2. Corresponding grooves and protrusions are respectively provided at both ends of each semi-circular rotating base 106 for combining the two semi-circular rotating bases 106 into a ring. The two semi-circular rotating bases 106 are clamped through the grooves and protrusions and fixed by a fixed pin shaft 107. Inverted "T"-shaped guide rail grooves are respectively provided on the upper surfaces of each semi-circular rotating base 106, and the two inverted "T"-shaped guide rail grooves are parallel to each other. I-shaped guide rails 104 are respectively connected in the two inverted "T"-shaped guide rail grooves through bolts.

[0029] The hydraulic-driven seal test unit 1 further includes a pair of slide plates 102 arranged in parallel. Two "T"-shaped guide rail grooves are provided on the lower surface of each slide plate 102, and the "T"-shaped guide rail grooves are slidably connected with the corresponding I-shaped guide rails 104; each slide plate 102 is connected to each semi-circular rotating base 106 through a plurality of first hydraulic cylinder assemblies 103, and each first hydraulic cylinder assembly 103 is parallel to the I-shaped guide rail 104. The purpose is to push the slide plate 102 through the expansion and contraction of the first hydraulic cylinder assembly 103, so that the slide plate 102 slides on the I-shaped guide rail 104 and realizes the opening and closing function.

[0030] Each skateboard 102 is provided with a semi-circular through hole. When two semi-circular through holes are close to each other, a circular hole is formed, and the axis of the circular hole coincides with the axis of the circular hole formed by two semi-circular rotating bases 106; a number of side pipe pressure test cap units are evenly arranged around the periphery of the semi-circular through hole.

[0031] As Figure 3-6 shown, the side pipe pressure test cap unit includes an installation hole 112, which is composed of a first hole section, a second hole section and a third hole section. Ring grooves 111 with the same diameter are respectively arranged in the first hole section and the second hole section of the installation hole 112. The purpose is to enable the step 110 of the side pipe pressure test cap 101 to rotate in the ring groove 111. Side pipe pressure test cap fixing pin holes are symmetrically arranged on both sides of the installation hole 112, and the side pipe pressure test cap fixing pin holes pass through the two ring grooves 111. The side pipe pressure test cap unit also includes a side pipe pressure test cap 101, which is composed of a first cylinder 108, a second cylinder 109 and a third cylinder 113. A pressure test hole is arranged in the center of the side pipe pressure test cap 101. A side pipe joint is arranged at the bottom of the second cylinder of the side pipe pressure test cap 101, and the side pipe joint is matched with the side pipe joint of the riser string 3. The first cylinder 108, the second cylinder 109 and the third cylinder 113 are respectively matched with the corresponding hole sections of the installation hole 112. Two symmetrically distributed steps 110 are fixedly connected to one end of the third cylinder 113 close to the first cylinder 108. The width direction of each step 110 is arc-shaped, and the length of the step 110 corresponds to the diameter of each ring groove 111. Pin holes corresponding to the side pipe pressure test cap fixing pin holes are arranged on the step 110. A counterbore corresponding to the cross section formed by the two steps 110 is also arranged in the installation hole 112. The counterbore extends from the lower surface of the skateboard 102 to the ring groove 111 of the first hole section of the installation hole 112. The purpose is to enable the side pipe pressure test cap 101 to slide up and down in the installation hole 112. The long direction of the counterbore is perpendicular to the plane where the two side pipe pressure test cap fixing pin holes are located. The side pipe pressure test cap unit also includes a side pipe pressure test cap fixing pin 105, and the side pipe pressure test cap fixing pin 105 penetrates into the side pipe pressure test cap fixing pin hole and the corresponding step 110 of the side pipe pressure test cap 101

[0032] As Figure 7 shown, the hydraulic-driven riser support unit 2 includes an upper support plate 201 and a lower support plate 202. A circular boss corresponding to the inner ring groove of a pair of semi-circular rotating bases 106 is arranged at the top of the upper support plate 201, and the circular boss is sleeved in the ring groove; circular holes are arranged in the centers of the upper support plate 201 and the lower support plate 202. A number of hydraulic telescopic arm units are arranged between the upper support plate 201 and the lower support plate 202, and the number of hydraulic telescopic arm units is evenly distributed around the circular hole for the purpose of supporting and clamping the riser string 3; a connecting ring 203 is threadedly connected to the lower surface of the lower support plate 202.

[0033] As Figure 8 and Figure 9As shown in the figure, the hydraulic telescopic arm unit includes a pair of vertical plates 206 parallel to the radial direction of the circular hole. A hydraulic cylinder fixing plate 207 is fixedly connected between the two vertical plates 206. A second hydraulic cylinder assembly 204 is fixedly connected to the center of the hydraulic cylinder fixing plate 207. A telescopic arm 205 is slidably connected between the two vertical plates 206. The cross-section of one end of the telescopic arm 205 close to the circular hole is trapezoidal. A rectangular groove is opened at one end of the telescopic arm 205 far from the circular hole. The hydraulic cylinder assembly 204 passes through the rectangular groove and is fixedly connected to the telescopic arm 205. A number of through holes are opened on each vertical plate 206 along the direction parallel to the axis of the circular hole. Threaded holes corresponding to the through holes of the vertical plates 206 are opened on both the upper support plate 201 and the lower support plate 202. Each vertical plate 206 is connected between the upper support plate 201 and the lower support plate 202 by bolts passing through the corresponding through holes and the corresponding threaded holes. By hydraulically driving the piston of the second hydraulic cylinder assembly 204 to extend or retract into the cylinder body, the telescopic arm 205 is driven to extend or retract, so as to realize the opening or closing of the hydraulic-driven riser support unit 2; when the telescopic arm 205 retracts, the hydraulic-driven riser support unit 2 is opened, and the riser string 3 is lowered or retrieved through the central through hole of the hydraulic-driven riser support unit 2; when the telescopic arm 205 extends, the hydraulic-driven riser support unit 2 is closed, and the riser string sits on the telescopic arm 205. The hydraulic-driven riser support unit 2 can support the riser string to meet the connection of a single riser and the riser string or the side pipe seal test of the riser string.

[0034] This device has three working states: the riser string seal test state, the riser string lowering and retrieving state, and the state of supporting the riser string.

[0035] In the riser string seal test state, both the hydraulic-driven seal test unit 1 and the hydraulic-driven riser support unit 2 are closed, that is, the first hydraulic cylinder assembly 103 retracts into the cylinder body, and the two slide plates 102 slide along the I-shaped guide rail 104 towards its central hole. The second hydraulic cylinder assembly 204 moves towards the center of the hydraulic-driven riser support unit 2. At this time, the central through holes of the hydraulic-driven seal test unit 1 and the hydraulic-driven riser support unit 2 are the smallest. The telescopic arm 205 of the hydraulic-driven riser support unit 2 extends to support the riser string 3. The side pipe test cap fixing pin 105 is pulled out, and the side pipe test cap 101 is inserted into the side pipe joint of the riser string 3. Water is injected into the side pipe of the riser string through the side pipe test cap 101 to conduct a seal test on the side pipe of the riser string.

[0036] When not performing a seal test, the side pipe test cap 101 is located in the upper annular groove of the installation hole 112, and the side pipe test cap fixing pin 105 passes through the through hole on the step 110 and the side pipe test cap fixing pin hole.

[0037] When a seal test is required, the skateboard 102 is closed. The fixing pin 105 of the side pipe pressure test cap is pulled out, and the side pipe pressure test cap 101 is rotated 90°. That is, the step 110 rotates in the upper annular groove and aligns with the counterbore of the mounting hole 112. The step 110 moves down along the counterbore of the mounting hole 112 to the lower annular groove. The mounting hole 112 coincides with the central axis of the side pipe joint of the riser string 3. Then, the step 110 of the side pipe pressure test cap 101 is rotated 90° in the lower annular groove, and the fixing pin 105 of the side pipe pressure test cap is inserted for locking.

[0038] After the seal test is completed, the fixing pin 105 of the side pipe pressure test cap is pulled out, and the side pipe pressure test cap 101 is rotated 90° to align the step 110 with the counterbore of the mounting hole 112. The side pipe pressure test cap 101 is moved upward along the counterbore so that the step 110 of the side pipe pressure test cap 101 reaches the upper annular groove of the mounting hole 112. The side pipe pressure test cap 101 is rotated 90° in the upper annular groove of the mounting hole 112, and finally the fixing pin 105 of the side pipe pressure test cap is inserted for locking.

[0039] When the riser string is being lowered and retrieved, both the hydraulic-driven seal test unit 1 and the hydraulic-driven riser support unit 2 are opened. That is, the first hydraulic cylinder assembly 103 extends out of the cylinder body, and the two skateboards 102 slide along the I-shaped guide rail 104 away from their central through holes. The second hydraulic cylinder assembly 204 moves away from its central through hole. At this time, the central through holes of the hydraulic-driven seal test unit 1 and the hydraulic-driven riser support unit 2 reach the maximum, and the riser string 3 can pass through the central through hole of the offshore drilling riser seal test device.

[0040] When the riser string is in the supported state, the hydraulic-driven seal test unit 1 is opened, and the hydraulic-driven riser support unit 2 is closed. That is, the first hydraulic cylinder assembly 103 extends out of the cylinder body, and the two right skateboards 102 slide along the I-shaped guide rail 104 away from their central through holes. The second hydraulic cylinder assembly 204 moves toward its central through hole. At this time, the central through hole of the hydraulic-driven seal test unit 1 reaches the maximum, and the central through hole of the hydraulic-driven riser support unit 2 reaches the minimum. The telescopic arm 205 of the hydraulic-driven riser support unit 2 supports the riser string 3. The riser running tool hoists and moves a single joint of the riser and passes the single joint of the riser through the central through hole of the hydraulic-driven seal test unit 1, which can be used for connecting the single joint of the riser to the riser string 3.

[0041] The marine drilling riser sealing test device provided by the present invention has the following working principle: When it is necessary to conduct a sealing test on the drilling riser string every time 3 to 5 new risers are connected, the hydraulic-driven riser support unit 2 is closed by hydraulic drive, so that the telescopic arm 205 extends to support the riser string 3. The riser feeding tool without a pressure test cap disconnects from the riser string 3 and can continue to the riser catwalk to hoist and move the riser to prepare for connection with the riser string 3. The riser string 3 is seated on the telescopic arm 205 of the hydraulic-driven riser support unit 2. The hydraulic-driven sealing test unit 1 is closed by hydraulic drive, and multiple side pipe pressure test caps 101 are centered with the side pipes of the riser string 3. The fixing pin 105 of the side pipe pressure test cap is pulled out, and the side pipe pressure test cap 101 rotates 90° in the top annular groove 111, and the side pipe pressure test cap 101 is lowered to the bottom limit position in the bottom annular groove 111. The side pipe pressure test cap 101 is inserted into the side pipe of the riser string 3, the side pipe pressure test cap 101 rotates 90°, and the fixing pin 105 of the side pipe pressure test cap is inserted to lock the side pipe pressure test cap 101. The pressure source is connected to the side pipe pressure test cap 101 and pressure boosting and pressure stabilizing operations are carried out to complete the sealing test of the drilling riser string. After completing the sealing test of the connected drilling riser string, the fixing pin 105 of the side pipe pressure test cap is pulled out, the side pipe pressure test cap 101 rotates 90°, the side pipe pressure test cap 101 is lifted to the top annular groove 111 at the upper limit position and rotates 90°, the fixing pin 105 of the side pipe pressure test cap is inserted to lock the side pipe pressure test cap 101, and then the hydraulic-driven sealing test unit 1 is opened by hydraulic drive. Continue to hoist and move a single riser to connect with the riser string according to the above steps, and conduct a sealing test on the side pipes of the connected drilling riser string until all single riser connections and side pipe sealing tests of the riser string are completed.

[0042] Embodiment 1

[0043] As Figure 1 shown, the marine drilling riser sealing test device proposed in this embodiment includes a hydraulic-driven sealing test unit 1, and a hydraulic-driven riser support unit 2 is connected to the lower part of the hydraulic-driven sealing test unit 1.

[0044] Embodiment 2

[0045] As Figure 1 、 2As shown in FIGS. 2 and 3, the marine drilling riser sealing test device proposed in this embodiment includes a hydraulic drive sealing test unit 1, and a hydraulic drive riser support unit 2 is connected to the lower part of the hydraulic drive sealing test unit 1; the hydraulic drive sealing test unit 1 includes a pair of semi-circular rotating bases 106. A ring groove is provided on the inner circumferential surface of each semi-circular rotating base 106. Corresponding grooves and protrusions are respectively provided at both ends of each semi-circular rotating base 106. The two semi-circular rotating bases 106 are clamped through the grooves and protrusions and fixed by fixing pins 107. An inverted "T" - shaped guide rail groove is respectively provided on the upper surface of each semi-circular rotating base 106. The two inverted "T" - shaped guide rail grooves are parallel to each other. I - shaped guide rails 104 are respectively connected in the two inverted "T" - shaped guide rail grooves through bolts; the hydraulic drive sealing test unit 1 further includes a pair of parallel - arranged sliding plates 102. A "T" - shaped guide rail groove is provided on the lower surface of each sliding plate 102. The "T" - shaped guide rail groove is slidably connected to the corresponding I - shaped guide rail 104; each sliding plate 102 and each semi-circular rotating base 106 are connected through a plurality of first hydraulic cylinder assemblies 103. Each first hydraulic cylinder assembly 103 is parallel to the I - shaped guide rail 104.

[0046] Embodiment 3

[0047] As Figure 1-6As shown in the figure, the marine drilling riser sealing test device proposed in this embodiment includes a hydraulic drive sealing test unit 1, and a hydraulic drive riser support unit 2 is connected to the lower part of the hydraulic drive sealing test unit 1; the hydraulic drive sealing test unit 1 includes a pair of semi-circular rotating bases 106. A ring groove is provided on the inner circumferential surface of each semi-circular rotating base 106. Corresponding grooves and protrusions are respectively provided at both ends of each semi-circular rotating base 106. The two semi-circular rotating bases 106 are clamped through the grooves and protrusions and fixed by a fixing pin 107. An inverted "T" shaped guide groove is respectively provided on the upper surface of each semi-circular rotating base 106. The two inverted "T" shaped guide grooves are parallel to each other. I-shaped guide rails 104 are respectively connected in the two inverted "T" shaped guide grooves by bolts; the hydraulic drive sealing test unit 1 further includes a pair of parallel sliding plates 102. A "T" shaped guide groove is provided on the lower surface of each sliding plate 102. The "T" shaped guide groove is slidably connected to the corresponding I-shaped guide rail 104; each sliding plate 102 and each semi-circular rotating base 106 are connected by a plurality of first hydraulic cylinder assemblies 103. Each first hydraulic cylinder assembly 103 is parallel to the I-shaped guide rail 104; each sliding plate 102 is provided with a semi-circular through hole. When the two semi-circular through holes are closely attached, a circular hole is formed. The axis of the circular hole coincides with the axis of the circular hole formed by the two semi-circular rotating bases 106; a plurality of side pipe pressure test cap units are evenly provided on the periphery of the semi-circular through hole; the side pipe pressure test cap unit includes an installation hole 112. The installation hole 112 is composed of a first hole section, a second hole section and a third hole section. Ring grooves 111 with the same diameter are respectively provided in the first hole section and the second hole section of the installation hole 112. Side pipe pressure test cap fixing pin holes are symmetrically provided on both sides of the installation hole 112. The side pipe pressure test cap fixing pin holes penetrate through the two ring grooves 111. The side pipe pressure test cap unit further includes a side pipe pressure test cap 101. The side pipe pressure test cap 101 is composed of a first cylinder 108, a second cylinder 109 and a third cylinder 113. A pressure test hole is provided at the center of the side pipe pressure test cap 101. A side pipe joint is provided at the bottom of the second cylinder of the side pipe pressure test cap 101. The side pipe joint is matched with the side pipe joint of the riser string 3. The first cylinder 108, the second cylinder 109 and the third cylinder 113 respectively cooperate with the corresponding hole sections of the installation hole 112. Two symmetrically distributed steps 110 are fixedly connected to one end of the third cylinder 113 close to the first cylinder 108. The width direction of each step 110 is arc-shaped. The length of the step 110 corresponds to the diameter of each ring groove 111. A pin hole corresponding to the side pipe pressure test cap fixing pin hole is provided on the step 110. The installation hole 112 is further provided with a sink groove corresponding to the cross section formed by the two steps 110. The sink groove extends from the lower surface of the sliding plate 102 to the ring groove 111 of the first hole section of the installation hole 112. The long direction of the sink groove is perpendicular to the plane where the two side pipe pressure test cap fixing pin holes are located. The side pipe pressure test cap unit further includes a side pipe pressure test cap fixing pin 105. The side pipe pressure test cap fixing pin 105 penetrates into the side pipe pressure test cap fixing pin hole and the step 110 of the corresponding side pipe pressure test cap 101.

[0048] Example 4

[0049] As Figure 1-10As shown in the figure, the marine drilling riser sealing test device proposed in this embodiment includes a hydraulic drive sealing test unit 1, and a hydraulic drive riser support unit 2 is connected to the lower part of the hydraulic drive sealing test unit 1; the hydraulic drive sealing test unit 1 includes a pair of semi-circular rotating bases 106. The inner circumferential surface of each semi-circular rotating base 106 is provided with a ring groove. Corresponding grooves and protrusions are respectively provided at both ends of each semi-circular rotating base 106. The two semi-circular rotating bases 106 are clamped through the grooves and protrusions and fixed by fixing pins 107. The upper surface of each semi-circular rotating base 106 is respectively provided with an inverted "T" - shaped guide groove. The two inverted "T" - shaped guide grooves are parallel to each other. I - shaped guide rails 104 are respectively connected in the two inverted "T" - shaped guide grooves by bolts; the hydraulic drive sealing test unit 1 further includes a pair of parallel - arranged sliding plates 102. A "T" - shaped guide groove is provided on the lower surface of each sliding plate 102. The "T" - shaped guide groove is slidably connected with the corresponding I - shaped guide rail 104; each sliding plate 102 and each semi - circular rotating base 106 are connected by a number of first hydraulic cylinder assemblies 103. Each first hydraulic cylinder assembly 103 is parallel to the I - shaped guide rail 104; each sliding plate 102 is provided with a semi - circular through - hole. When the two semi - circular through - holes are close to each other, they form a circular hole. The axis of the circular hole coincides with the axis of the circular hole formed by the two semi - circular rotating bases 106; a number of side - pipe pressure - test cap units are evenly arranged around the periphery of the semi - circular through - hole; the side - pipe pressure - test cap unit includes an installation hole 112. The installation hole 112 is composed of a first hole section, a second hole section, and a third hole section. Ring grooves 111 with the same diameter are respectively provided in the first hole section and the second hole section of the installation hole 112. Side - pipe pressure - test cap fixing pin holes are symmetrically provided on both sides of the installation hole 112. The side - pipe pressure - test cap fixing pin holes penetrate through the two ring grooves 111. The side - pipe pressure - test cap unit further includes a side - pipe pressure - test cap 101. The side - pipe pressure - test cap 101 is composed of a first cylinder 108, a second cylinder 109, and a third cylinder 113. A pressure - test hole is provided at the center of the side - pipe pressure - test cap 101. A side - pipe joint is provided at the bottom of the second cylinder of the side - pipe pressure - test cap 101. The side - pipe joint is matched with the side - pipe joint of the riser string 3. The first cylinder 108, the second cylinder 109, and the third cylinder 113 respectively cooperate with the corresponding hole sections of the installation hole 112. Two symmetrically distributed steps 110 are fixedly connected to one end of the third cylinder 113 close to the first cylinder 108. The width direction of each step 110 is arc - shaped. The length of the step 110 corresponds to the diameter of each ring groove 111. A pin hole corresponding to the side - pipe pressure - test cap fixing pin hole is provided on the step 110. The installation hole 112 is also provided with a sunk groove corresponding to the cross - section formed by the two steps 110. The sunk groove extends from the lower surface of the sliding plate 102 to the ring groove 111 of the first hole section of the installation hole 112. The long direction of the sunk groove is perpendicular to the plane where the two side - pipe pressure - test cap fixing pin holes are located. The side - pipe pressure - test cap unit further includes a side - pipe pressure - test cap fixing pin 105. The side - pipe pressure - test cap fixing pin 105 penetrates into the side - pipe pressure - test cap fixing pin hole and the corresponding step 110 of the side - pipe pressure - test cap 101;The hydraulic-driven riser support unit 2 includes an upper support disc 201 and a lower support disc 202. The top of the upper support disc 201 is provided with an annular boss corresponding to the inner ring groove of a pair of semi-circular rotating bases 106, and the annular boss is sleeved in the ring groove; circular holes are opened at the centers of the upper support disc 201 and the lower support disc 202, and a number of hydraulic telescopic arm units are arranged between the upper support disc 201 and the lower support disc 202, and the number of hydraulic telescopic arm units are evenly distributed around the circular hole in a week; a connecting ring 203 is connected to the lower surface of the lower support disc 202 by a thread; the hydraulic telescopic arm unit includes a pair of vertical plates 206 parallel to the radial direction of the circular hole, a hydraulic cylinder fixing plate 207 is fixedly connected between the two vertical plates 206, a second hydraulic cylinder assembly 204 is fixedly connected to the center of the hydraulic cylinder fixing plate 207, a telescopic arm 205 is slidably connected between the two vertical plates 206, the cross-section of one end of the telescopic arm 205 close to the circular hole is trapezoidal, a rectangular groove is opened at one end of the telescopic arm 205 far from the circular hole, the hydraulic cylinder assembly 204 passes through the rectangular groove and is fixedly connected to the telescopic arm 205, a number of through holes are opened on each vertical plate 206 along the direction parallel to the axis of the circular hole, threaded holes corresponding to the through holes of the vertical plates 206 are opened on both the upper support disc 201 and the lower support disc 202, and each vertical plate 206 is connected between the upper support disc 201 and the lower support disc 202 by bolts passing through the corresponding through holes and the corresponding threaded holes.;

Claims

1. An offshore drilling riser sealing test device, characterized in that, It comprises a hydraulically driven sealing test unit (1), the lower part of which is connected to a hydraulically driven watertight pipe support unit (2).

2. The offshore drilling riser sealing test device according to claim 1, characterized in that, The hydraulically driven sealing test unit (1) comprises a pair of semi-annular rotating bases (106), the inner ring surface of each semi-annular rotating base (106) is provided with an annular groove, the two ends of each semi-annular rotating base (106) are respectively provided with corresponding grooves and protrusions, the two semi-annular rotating bases (106) are clamped by the grooves and protrusions and fixed by a fixing pin (107), the upper surface of each semi-annular rotating base (106) is respectively provided with an inverted "T"-shaped guide groove, the two inverted "T"-shaped guide grooves are parallel to each other, and the two inverted "T"-shaped guide grooves are respectively connected with I-shaped guide rails (104) by bolts.

3. The offshore drilling riser sealing test device according to claim 2, characterized in that, The hydraulically driven sealing test unit (1) further comprises a pair of slide plates (102) arranged in parallel with each other, wherein a "T"-shaped guide rail groove is provided on the lower surface of each slide plate (102), and the "T"-shaped guide rail groove is slidably connected to a corresponding I-shaped guide rail (104); each slide plate (102) is connected to each semi-annular rotating base (106) via a plurality of first hydraulic cylinder assemblies (103), and each first hydraulic cylinder assembly (103) is parallel to the I-shaped guide rail (104).

4. The offshore drilling riser sealing test device according to claim 3, characterized in that, Each of the slide plates (102) is provided with a semicircular through hole, and when the two semicircular through holes are closely attached, a circular hole is formed, and the axis of the circular hole coincides with the axis of the circular hole formed by the two semi-circular rotating bases (106); a plurality of side tube pressure test cap units are evenly provided on the periphery of the semicircular through hole.

5. The offshore drilling riser sealing test device according to claim 4, characterized in that, The side pipe pressure test cap unit includes an installation hole (112), which is composed of a first hole section, a second hole section, and a third hole section. Ring grooves (111) with the same diameter are respectively provided in the first hole section and the second hole section of the installation hole (112). Side pipe pressure test cap fixing pin holes are symmetrically provided on both sides of the installation hole (112), and the side pipe pressure test cap fixing pin holes pass through the two ring grooves (111). The side pipe pressure test cap unit further includes a side pipe pressure test cap (101), which is composed of a first cylinder (108), a second cylinder (109), and a third cylinder (113). A pressure test hole is provided in the center of the side pipe pressure test cap (101). A side pipe joint is provided at the bottom of the second cylinder of the side pipe pressure test cap (101), and the side pipe joint is matched with the side pipe joint of the riser string (3). The first cylinder (108), the second cylinder (109), and the third cylinder (113) are respectively matched with the corresponding hole sections of the installation hole (112). Two symmetrically distributed steps (110) are fixedly connected to one end of the third cylinder (113) close to the first cylinder (108). The width direction of each step (110) is arc-shaped, and the length of the step (110) corresponds to the diameter of each ring groove (111). Pin holes corresponding to the side pipe pressure test cap fixing pin holes are provided on the steps (110). The installation hole (112) is also provided with a counterbore corresponding to the cross-section formed by the two steps (110). The counterbore extends from the lower surface of the slide plate (102) to the ring groove (111) of the first hole section of the installation hole (112). The longitudinal direction of the counterbore is perpendicular to the plane where the two side pipe pressure test cap fixing pin holes are located. The side pipe pressure test cap unit further includes a side pipe pressure test cap fixing pin (105), and the side pipe pressure test cap fixing pin (105) penetrates into the side pipe pressure test cap fixing pin hole and the corresponding step (110) of the side pipe pressure test cap (101).

6. The offshore drilling riser sealing test device according to claim 5, characterized in that, The hydraulic-driven riser support unit (2) includes an upper support plate (201) and a lower support plate (202). An annular boss corresponding to the inner ring groove of a pair of semi-circular rotating bases (106) is provided at the top of the upper support plate (201), and the annular boss is sleeved in the ring groove. Circular holes are provided in the centers of the upper support plate (201) and the lower support plate (202). A number of hydraulic telescopic arm units are provided between the upper support plate (201) and the lower support plate (202), and the number of hydraulic telescopic arm units are evenly distributed in a circle along the circular hole. A connecting ring (203) is connected to the lower surface of the lower support plate (202) by threads.

7. The offshore drilling riser sealing test device according to claim 6, characterized in that, The hydraulic telescopic arm unit includes a pair of vertical plates (206) parallel to the radial direction of the circular hole. A hydraulic cylinder fixing plate (207) is fixedly connected between the two vertical plates (206). A second hydraulic cylinder assembly (204) is fixedly connected to the center of the hydraulic cylinder fixing plate (207). A telescopic arm (205) is slidably connected between the two vertical plates (206). The cross-section of one end of the telescopic arm (205) close to the circular hole is trapezoidal. A rectangular groove is formed at one end of the telescopic arm (205) far from the circular hole. The hydraulic cylinder assembly (204) passes through the rectangular groove and is fixedly connected to the telescopic arm (205). A plurality of through holes are formed in each vertical plate (206) along the direction parallel to the axis of the circular hole. Threaded holes corresponding to the through holes of the vertical plates (206) are formed on both the upper support plate (201) and the lower support plate (202). Each vertical plate (206) is connected between the upper support plate (201) and the lower support plate (202) by bolts passing through the corresponding through holes and the corresponding threaded holes.

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