CN202442878U - Indoor experimental apparatus for simulating interaction of deep-water drilling underwater casing string and seabed shallow soft soil - Google Patents
Indoor experimental apparatus for simulating interaction of deep-water drilling underwater casing string and seabed shallow soft soil Download PDFInfo
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- CN202442878U CN202442878U CN 201220074600 CN201220074600U CN202442878U CN 202442878 U CN202442878 U CN 202442878U CN 201220074600 CN201220074600 CN 201220074600 CN 201220074600 U CN201220074600 U CN 201220074600U CN 202442878 U CN202442878 U CN 202442878U
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Abstract
The utility model discloses an indoor experimental apparatus for simulating interaction of a deep-water drilling underwater casing string and seabed shallow soft soil. The apparatus comprises a hollow barrel-shaped object (1), a bottom clamping device (2), a variable section casing string combination (3) and a data acquisition system (15). The bottom clamping device (2) is arranged at the bottom of the hollow barrel-shaped object (1) and used for clamping and fixing the bottom end of the variable section casing string combination (3) for experiments. The data acquisition system (15) is connected with a force sensor (12) of a circulation loading device (9), an acceleration transducer (10), a telescopic type displacement transducer (11), a strain gauge attached to a pipe wall of the variable section casing string combination (3) and a soil pressure meter buried on the periphery of the variable section casing string combination (3) to acquire experiment data in real time, wherein the acceleration transducer (10) and the telescopic type displacement transducer (11) are arranged at the top of the casing string. The indoor experimental apparatus can finish indoor experimental research of an interaction mechanism of the casing string and the seabed shallow soft soil under the effect of transverse circulation load and different working conditions for deep water drilling operation, an experimental result can provide support for the deep water drilling operation of our country, and remarkable economic benefits are brought.
Description
Technical field
The utility model relates to the ocean deepwater drilling technical field, in particular a kind of simulation deepwater drilling water lower casing string and the interactional indoor experimental apparatus of seabed superficial part weak soil.
Background technology
Deepwater drilling underwater well mouth first line of a couplet preventer stack and marine riser; Under connect bunch tube (forming) by conduit and other sleeve pipes; It is stressed very complicated, and the water proof pipeline of deep-sea rugged environment, superficial part stratum, low intensive seabed, growth, the factors such as preventer stack that increase the weight of to strengthen all propose higher requirement to the stability of subsea wellhead.The acting force that subsea wellhead bears during deepwater drilling mainly is freed from the gravity of vertical and horizontal counter-force, preventer stack and the suspension sleeve string at marine riser bottom fitting place, the horizontal wave current power that acts on preventer stack and well head, submarine soil layer to the vertical and lateral resistance of sleeve pipe etc.The acting in conjunction of these acting forces possibly cause well head and sinking or transverse pitch, the danger that will exist whole well head to cave in when exceeding design limit when well head and with the moment of flexure value that lower casing string bears take place with lower casing string thereof.
Superficial part stratum, seabed is the support of deepwater drilling underwater well mouth and string of casing, and therefore, the seabed mud line under the marine riser dynamic action is one of key issue wherein with the interaction mechanism of running casing and weak soil.Independently do not carry out deepwater drilling operation practice at present as yet owing to carry out in-site modeling expense height and China, therefore, the laboratory experiment simulation is a kind of effective means.
Though attracted many researchers' attention in recent years to the dynamics research of the pile-soil interaction in building and the construction work, because the complicacy of stake soil mechanics behavior, the dynamic action theory between the stake soil still is in the hot research stage.Between string of casing and the seabed superficial part weak soil each other dynamic action mainly contain following some reason: 1. make marine riser act on the power relative complex on string of casing top than complicated of conventional piles soil model by factors such as wave and ocean current power, drilling platform slow-drift motions more.2. under the marine riser dynamic action, tubing string and veneer of soil segregation phenomenon largely will appear in string of casing in the superficial part weak soil of seabed, thereby cause that more the soil body of deep layer separates.3. string of casing belongs to variable cross section, stiffness changing structure, simultaneously big many of the more conventional pile of setting depth.4. the soil layer property on deep water seabed superficial part stratum is different with shallow water and land.5. marine riser is delivered to subsea wellhead and mud line is mainly ultralow frequency lateral load (between the 1/300-1/100Hz) with the power on the lower casing string.
Therefore, present traditional pile foundation dynamic experiment analytical approach can't solve the problem of deepwater drilling water lower casing string and seabed superficial part weak soil interphase interaction.Do not put into practice owing to China carries out the deepwater drilling operation field as yet in addition, and do not have ripe deepwater drilling water lower casing string and seabed superficial part weak soil interphase interaction experimental study scheme.
The utility model content
Based on above-described problem; The utility model consider mainly that the string of casing top receives ultralow frequency lateral load ringing, string of casing and around it weak soil generation segregation phenomenon, string of casing be that prop up admittedly variable cross section and stiffness changing structure, string of casing bottom, weak soil is immersed in the particular problem in the medium ocean deepwater oil/gas drilling of the water engineering, provide a kind of newly be used to simulate deepwater drilling water lower casing string and the interactional experimental provision of its seabed superficial part weak soil.
The technical scheme of the utility model is following:
A kind of simulation deepwater drilling water lower casing string and the interactional indoor experimental apparatus of seabed superficial part weak soil comprise hollow barrel-shaped thing (1), bottom clamping device (2), the combination of variable cross section string of casing (3), data acquisition system (DAS) (15); Said hollow barrel-shaped thing (1) bottom is provided with bottom clamping device (2), in order to grip experiment with variable cross section string of casing combination (3) bottom; Said hollow barrel-shaped thing (1) lower side has osculum (4) and the sealing dodge gate (5) of diameter 5cm, the draining after osculum (4) finishes in order to experiment, the removing of soil sample after sealing dodge gate (5) finishes in order to experiment; Hollow barrel-shaped thing (1) inner space is used for loading experiment with soil sample (14), and soil sample (14) top covers experimental water, in order to simulate the soft soil foundation situation that the seabed superficial part is immersed in water; Variable cross section string of casing combination (3) top screws in its top weight (8) with the form of screw thread; Paste paired foil gauge (6) along variable cross section string of casing combination (3) axial direction diverse location; The embedding earth pressure gauge of different depth in variable cross section string of casing combination (3) experiment soil sample (14) on every side is so that measure the strain of variable cross section string of casing combination (3) under the different situations and the contact pressure at pipeclay interface; Act on variable cross section string of casing combination (3) top vertical force and carry out static loading simulation with weight (8); Transverse force adopts two-way CYCLIC LOADING device (9) to load; Variable cross section string of casing combination (3) top is equipped with acceleration transducer (10), in order to measure the transverse acceleration of variable cross section string of casing combination (3) top under the effect of horizontal cross cyclic load; Right ends is connected with extension type displacement transducer (11) at variable cross section string of casing combination (3) top, in order to the displacement of measuring tube column top under the effect of horizontal cross cyclic load;
Data acquisition system (DAS) (15) links to each other with force transducer (12), tubing string top acceleration transducer (10) and the extension type displacement transducer (11) of CYCLIC LOADING device (9), foil gauge (6), variable cross section string of casing combination (3) embedding on every side earth pressure gauge that variable cross section string of casing combination (3) tube wall adheres to, in order to real-time collection experimental data.
Described indoor experimental apparatus, said hollow barrel-shaped thing (1) internal diameter 2m, thickness 1-2mm, height 2.5m, the top uncovered, the bottom is that thickness is the steel plate of 10mm.
Described indoor experimental apparatus, said variable cross section string of casing combination (3) are for the steel pipe or the aluminum pipe of the different-diameter of diameter 3-5cm or plexi-glass tubular is mutually nested forms.
This experimental provision has easy to use; Simple to operate; Can simulate the situation of different operating mode lower casing strings of deepwater drilling and weak soil interphase interaction around it; Accomplish the in-house laboratory investigation of deepwater drilling water lower casing string and seabed superficial part weak soil interaction mechanism, experimental result can provide support for China's deepwater drilling operation, brings remarkable economic efficiency.
Description of drawings
Fig. 1 is deepwater drilling water lower casing string and the interactional indoor experimental apparatus synoptic diagram of seabed superficial part weak soil;
Fig. 2 is three kinds of variable cross section string of casing unitized construction synoptic diagram under the different operating modes.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
With reference to figure 1; This experimental provision adopts iron sheet or similar mediums to be made into the hollow barrel-shaped thing 1 of internal diameter 2m, height 2.5m; This barrel-shaped thing top uncovered, bottom are that the steel plate of 10mm is formed by the thick end, and bottom design has a bottom clamping device 2; Make up 3 bottoms in order to grip experiment with the variable cross section string of casing, can be in operation clamping of outside, hollow barrel-shaped thing 1 bottom and release; Hollow barrel-shaped thing 1 lower side has the osculum 4 and sealing dodge gate 5 of diameter 5cm, the draining after osculum 4 finishes in order to experiment, the removing of soil sample after sealing dodge gate 5 finishes in order to experiment; Hollow barrel-shaped thing 1 inner space is used for loading experiment with soil sample 14, and the soil sample top covers experimental water, in order to simulate the soft soil foundation situation that the seabed superficial part is immersed in water.Theoretical analysis proves; In the deepwater drilling process; Because it is darker that conduit and surface string are gone into the mud degree of depth, can be considered at the following 20-30m of mud line place to consolidate and prop up, so the height of hollow barrel-shaped thing 1 does not need too the higher position can simulate the situation that the deepwater drilling conduit is lowered to the 50-100m degree of depth; Otherwise the variable cross section string of casing combined diameter according to behind the length reduced scale is too small, brings bigger experimental error.
With reference to figure 2; Adopt the steel pipe or the mutually nested making variable cross section of similar mediums such as aluminum pipe or the plexi-glass tubular string of casing combination 3 of the different-diameter of diameter 3-5cm; The variable cross section string of casing that the conduit that is adopted according to actual well drilled by similarity principle and the engineer's scale of surface string are made several groups of various outer diameters and wall thickness makes up 3; The large diameter pipe 100 that simulation diameter 914.4mm conduit different wall, different length are arranged; The narrow tube 101 of simulation diameter 508mm surface string, large diameter pipe 100 can closely be nested on narrow tube 101 outer walls.Shown in Fig. 2 is three kinds of different actual conditions, thus various structure is arranged, but be not limited only to these three kinds.(a) is depicted as fashionable situation under conduit (large diameter pipe 100) injection that simulation top is diameter 914.4mm among Fig. 2; During making according to tubing string physical size and bendind rigidity scale down; The traverse cycle load that this operating mode downcomer top receives is by its top rod transmission, and load is less; (b) being depicted as simulation top is diameter 914.4mm conduit (large diameter pipe 100); Inside is lowered to diameter 508mm surface string (narrow tube 101); Large diameter pipe overlaps tight sleeve pipe on narrow tube, and the top of the string of casing of composition combination screws in its top weight 8 (preventer under the Simulated Water) with the form of screw thread, during making according to tubing string physical size and bendind rigidity scale down; The top marine riser is connected with preventer under water under this situation, and is vertical and the traverse cycle load is bigger; (c) be depicted as simulation top and be thickening large diameter pipe 102; The middle part is conventional large diameter pipe 100; Inside is narrow tube 101, and the top of the string of casing of composition combination screws in its top weight 8 (preventer under the Simulated Water) with the form of screw thread, during making according to tubing string physical size and bendind rigidity scale down; The top marine riser is connected with preventer under water under this situation, and has done thickening on conduit top and handled.
Make up 3 axial direction diverse locations along the variable cross section string of casing and paste paired foil gauge 6; The embedding earth pressure gauge of different depth in the experiment soil sample 14 around the variable cross section string of casing combination 3 is so that measure the strain of variable cross section string of casing combination 3 under the different situations and the contact pressure at pipeclay interface.
This experimental provision confirms to act on vertical force and the traverse cycle power that the variable cross section string of casing makes up 3 tops according to marine riser mechanical analysis result; Vertical force is carried out static loading simulation with weight 8; That transverse force adopts is two-way (about back and forth), and CYCLIC LOADING device 9 loads; This CYCLIC LOADING can be realized by servo actuator or low frequency vibration exciter; The variable cross section string of casing makes up 3 tops acceleration transducer 10 is installed, and makes up the transverse acceleration of 3 tops under the traverse cycle load action in order to measure the variable cross section string of casing.Right ends is connected with extension type displacement transducer 11 at empirical model tubing string top, and in order to the displacement of measuring tube column top under the traverse cycle load action, this displacement measurement also can be realized by contactless displacement transducer.
Data acquisition system (DAS) 15 and force transducer 12, tubing string top acceleration transducer 10 and extension type displacement transducer 11, the variable cross section string of casing of CYCLIC LOADING device 9 make up foil gauge 6, the embedding measurement instruments such as earth pressure gauge that 3 tube walls adhere on every side and link to each other, in order to real-time collection experimental data.
The dynamic strain data of the variable cross section string of casing combination under the cyclic load effect are gathered by Usage data collection system 15; In conjunction with the transversal displacement at variable cross section string of casing combination top as boundary condition; Can calculate different variable cross section string of casing and make up transversely deforming and stressing conditions under the different load actions, experimental result can be described under the deepwater drilling different work operating mode string of casing and seabed superficial part weak soil interphase interaction mechanism under water.
The experimental provision operation instruction:
It is as shown in Figure 1 that this experimental provision is installed signal.During with the deepwater drilling operation top marine riser and under water preventer stack be lowered to, conduit and surface string all are lowered to and the situation of cementing the well is the example device operation instruction that experimentizes.
1, before the experiment, earlier hollow barrel-shaped thing 1 is placed on the hyollow foundation 13, so that carry out the clamping and the releasing operation of variable cross section string of casing combination 3, hollow barrel-shaped thing 1 is kept vertical, internal cleaning is clean.
2, be diameter 914.4mm conduit (large diameter pipe) with the simulation top shown in Fig. 2 (b); Inside is lowered to diameter 508mm surface string (narrow tube); The large diameter pipe cover closely is nested on the narrow tube, and the top of the assembled casing column combination of composition screws in its top weight 8 (preventer under the Simulated Water) with the form of screw thread in advance.Make up 3 axial direction diverse locations along the variable cross section string of casing and paste foil gauge 6, and data line is drawn out to the variable cross section string of casing makes up 3 tops, at last this variable cross section string of casing is made up on the bottom clamping device 2 that 3 lower ends are fixed on hollow barrel-shaped thing 1.
3, hollow barrel-shaped thing 1 inner the filling tested with soft clay soil sample 14; It is 3 vertical note to keep the variable cross section string of casing to make up in the process of banketing; Make up the embedding earth pressure gauge of different depth in the experiment soil sample around 3 at the variable cross section string of casing simultaneously; So that pipeclay interface contact pressure under the measurement different situations, and data line is drawn out to data acquisition system (DAS) 15.Soil sample top covers experimental waters through water inlet 16, in order to the soft soil foundation situation that simulation seabed superficial part is immersed in water, leaves standstill a period of time to wait for that soil sample is saturated.
4, after soil sample load to be accomplished and left standstill a period of time, get small sample, use the parameters in soil mechanics such as density, water percentage, liquid plastic limit, undrained shear strength of conventional soil mechanics surveying instrument experiments of measuring soil sample.
5, confirm to act on vertical force and the traverse cycle power that the variable cross section string of casing makes up 3 tops according to marine riser mechanical analysis result; Vertical force is carried out static loading simulation with weight 8; Transverse force adopts two-way CYCLIC LOADING device 9 to load; Actuator and empirical model tubing string top link, and the tubing string top is equipped with acceleration transducer 10, make up the acceleration of 3 tops under the traverse cycle load action in order to measure the variable cross section string of casing.Make up 3 top right ends at empirical model variable cross section string of casing and be connected with extension type displacement transducer 11, in order to the displacement of measuring tube column top under the traverse cycle load action, data line is connected with data acquisition system (DAS) 15.
6, inspection begins experimentation after errorless; Variable cross section string of casing combination under the 15 collection cyclic load effects of Usage data collection system and the transverse strain data between weak soil; In conjunction with the transversal displacement at variable cross section string of casing combination top as boundary condition; Can calculate different variable cross section string of casing and make up transversely deforming and stressing conditions under the different load actions, experimental result can be described under this deepwater drilling operating mode string of casing and seabed superficial part weak soil interphase interaction mechanism under water.
7, after experiment finishes; Outside barrel-shaped thing bottom, carry out releasing operation in the face of bottom clamping device 2; Can discharge the variable cross section string of casing combination that is held; Can variable cross section string of casing combination slowly be proposed outside the bucket after the release, change different variable cross section string of casing and make up and test next time and needn't change soil sample 14 again.As to change soil sample 14, and then can earlier the osculum 4 of hollow barrel-shaped thing 1 lower side be opened, open the sealing dodge gate 5 of band sealing strip behind the row's of treating water, soil sample 14 is removed.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model accompanying claims according to above-mentioned explanation.
Claims (3)
1. simulate deepwater drilling water lower casing string and the interactional indoor experimental apparatus of seabed superficial part weak soil for one kind, it is characterized in that, comprise hollow barrel-shaped thing (1), bottom clamping device (2), the combination of variable cross section string of casing (3), data acquisition system (DAS) (15); Said hollow barrel-shaped thing (1) bottom is provided with bottom clamping device (2); Said hollow barrel-shaped thing (1) lower side has osculum (4) and the sealing dodge gate (5) of diameter 5cm; Hollow barrel-shaped thing (1) inner space is used for loading experiment with soil sample (14), and soil sample (14) top covers experimental water; Variable cross section string of casing combination (3) top screws in its top weight (8) with the form of screw thread; Paste paired foil gauge (6) along variable cross section string of casing combination (3) axial direction diverse location, the embedding earth pressure gauge of different depth in variable cross section string of casing combination (3) experiment soil sample (14) on every side; Adopt two-way CYCLIC LOADING device (9) to load at variable cross section string of casing combination (3) top, variable cross section string of casing combination (3) top is equipped with acceleration transducer (10); Right ends is connected with extension type displacement transducer (11) at variable cross section string of casing combination (3) top;
Data acquisition system (DAS) (15) links to each other with force transducer (12), tubing string top acceleration transducer (10) and the extension type displacement transducer (11) of CYCLIC LOADING device (9), foil gauge (6), variable cross section string of casing combination (3) embedding on every side earth pressure gauge that variable cross section string of casing combination (3) tube wall adheres to.
2. indoor experimental apparatus according to claim 1 is characterized in that, said hollow barrel-shaped thing (1) internal diameter 2m, thickness 1-2mm, height 2.5m, and the top uncovered, the bottom is that thickness is the steel plate of 10mm.
3. indoor experimental apparatus according to claim 1 is characterized in that, said variable cross section string of casing combination (3) is for the steel pipe or the aluminum pipe of the different-diameter of diameter 3-5cm or plexi-glass tubular is mutually nested forms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220074600 CN202442878U (en) | 2012-03-02 | 2012-03-02 | Indoor experimental apparatus for simulating interaction of deep-water drilling underwater casing string and seabed shallow soft soil |
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| CN 201220074600 CN202442878U (en) | 2012-03-02 | 2012-03-02 | Indoor experimental apparatus for simulating interaction of deep-water drilling underwater casing string and seabed shallow soft soil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607872A (en) * | 2012-03-02 | 2012-07-25 | 重庆科技学院 | Indoor experimental device for simulating interaction of deep water drilling underwater casing string and seabed shallow soft soil |
| CN103364124A (en) * | 2013-06-27 | 2013-10-23 | 天津大学 | Measuring device for soil resistance stressed on subsea oil and gas pipeline during horizontal movement |
| CN106837226A (en) * | 2017-03-06 | 2017-06-13 | 重庆科技学院 | The handler of marine riser fatigue monitoring device |
| CN109613211A (en) * | 2019-01-03 | 2019-04-12 | 同济大学 | The experimental system of pre-buried model pipeline is drawn along different directions under sand planting condition |
| CN112763247A (en) * | 2020-12-24 | 2021-05-07 | 中国石油大学(北京) | Deepwater underwater wellhead simulation test device |
-
2012
- 2012-03-02 CN CN 201220074600 patent/CN202442878U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607872A (en) * | 2012-03-02 | 2012-07-25 | 重庆科技学院 | Indoor experimental device for simulating interaction of deep water drilling underwater casing string and seabed shallow soft soil |
| CN103364124A (en) * | 2013-06-27 | 2013-10-23 | 天津大学 | Measuring device for soil resistance stressed on subsea oil and gas pipeline during horizontal movement |
| CN106837226A (en) * | 2017-03-06 | 2017-06-13 | 重庆科技学院 | The handler of marine riser fatigue monitoring device |
| CN106837226B (en) * | 2017-03-06 | 2023-02-24 | 重庆科技学院 | Loading and unloading device of marine riser fatigue monitoring device |
| CN109613211A (en) * | 2019-01-03 | 2019-04-12 | 同济大学 | The experimental system of pre-buried model pipeline is drawn along different directions under sand planting condition |
| CN109613211B (en) * | 2019-01-03 | 2021-07-02 | 同济大学 | Test system for pre-embedding model pipeline in traction sandy soil along different directions |
| CN112763247A (en) * | 2020-12-24 | 2021-05-07 | 中国石油大学(北京) | Deepwater underwater wellhead simulation test device |
| CN112763247B (en) * | 2020-12-24 | 2022-02-01 | 中国石油大学(北京) | Deepwater underwater wellhead simulation test device |
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Granted publication date: 20120919 Termination date: 20160302 |