A kind of frictional force of the passive type deep-sea heave compensator for ocean platform drilling well
Learn analysis method
Technical field
The present invention relates to the technical fields that frictional force in heave compensator calculates, especially a kind of to bore for ocean platform
The friction mechanical analyzing method of the passive type deep-sea heave compensator of well.
Background technique
Currently, exhaustion, the strategic perspective of development of world economy increasingly with land resources just gather on ocean, develop
Ocean science is particularly important with high tech equipment.In oil field, with the development of China's economic, especially as pillar industry
Petrochemical industry and auto industry fast development, the contradiction of oil and natural gas insufficient supply becomes increasingly conspicuous.In view of land stone
The increasingly exhaustion of oily resource, marches to deep-sea and has become inexorable trend.The overhead traveling crane liter being mounted on floating drilling platform or drill ship
Heavy compensation device, is not influenced mainly for the protection of drilling operation course by extraneous wave induced motion.
Crown-block heave compensator is during compensating drilling platforms heave movement, since there are hydraulic in device
The Pneumatic components such as mechanical transmission mechanisms and gas-liquid accumulator such as the hydraulic lines such as cylinder, wirerope rocker arm body, make its relative motion
Component has the presence of a large amount of frictional dampings during compensation campaign.Friction phenomenon between compensation campaign component will lead to compensation energy
The loss of amount, while the compensation precision of crown-block heave compensator being made to be a greater impact, cause Bottom Hole Bit Weight In A to generate fluctuation.Cause
This needs to consider that friction phenomenon is to compensation efficiency in compensation system in the design analytic process to crown-block heave compensator
With the influence of Bottom Hole Bit Weight In A fluctuation, urgent need sets up related mechanical model, and to influence crown-block heave compensator compensation efficiency
Friction factor be analyzed and evaluated.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provide a kind of method and step it is simple, can be from overhead traveling crane liter
The frictional force in compensation process is studied in terms of passive compensation part and Active Compensation part two in heavy compensation process, for sea
The friction mechanical analyzing method of the passive type deep-sea heave compensator of foreign platform well drilling.
The purpose of the present invention is achieved through the following technical solutions: a kind of passive type deep-sea liter for ocean platform drilling well
The friction mechanical analyzing method of heavy compensation device, it includes that compensation process friction mechanical analysis and frictional damping influence emulation point
Analysis;
Compensation process friction mechanical analysis the following steps are included:
Pressure loss amount in S11, calculating heave compensator in fluid pressure line:
Wherein, L is hydraulic line length;DlFor the diameter of hydraulic line;λ is coefficient of friction;ρ is hydraulic in hydraulic line
The density of oil;VlThe flowing velocity for being hydraulic oil in hydraulic line;
S12, the frictional force F when consideration generation in main hydraulic cylinderfWhen, the frictional force for obtaining a relative constant speed is steady
States model is as follows:
It is carried out in analytic process using simulation software 20-Sim, Frictional model may be expressed as:
Wherein, FfFor the frictional force in main hydraulic cylinder;FcFor Coulomb friction power;FsFor this Trebek frictional force;σvIt is viscous
Stagnant coefficient of friction;kpFor pressure term coefficient relevant to friction;P is the pressure in main hydraulic cylinder;ξ is Coulomb friction force curve
Steepness;vsFor this Trebek speed;Speed of the v between contact surface;
The frictional damping influence simulation analysis the following steps are included:
S21, overhead traveling crane heave compensation system simulation model is set up using 20-Sim software, simulation model includes floating type well drilling
Platform, the rack being set at the top of floating drilling platform and the Drilling derrick for being set to frame top, floating drilling platform top
Earrings screw and well drilling hoist is arranged in portion, and earrings screw and well drilling hoist are located at the left and right sides of rack, the Drilling derrick
It is inside provided with vertically arranged guide groove, floating overhead traveling crane is slidably fitted in the guide groove, is rotatably installed in floating overhead traveling crane
Offer the center sheave of multiple tracks wire casing on its cylinder, wirerope, be respectively arranged at rack left and right sides displacement compensating mechanism I and
Right displacement compensating mechanism II, the displacement compensating mechanism I and right displacement compensating mechanism II are symmetrical set;Bit shift compensation machine
Structure I includes first connecting rod, second connecting rod, directive wheel and compensation hydraulic oil cylinder, and the lower end of first connecting rod is articulated with frame top,
The other end of first connecting rod is articulated with the middle part of directive wheel, and one end of second connecting rod is articulated with the middle part of directive wheel, second connecting rod
The other end be articulated with the middle part of center sheave, compensation hydraulic oil cylinder, which is tilted to the right, to be set up, the cylinder barrel of compensation hydraulic oil cylinder
It is articulated in rack, the piston rod of compensation hydraulic oil cylinder is articulated with the bottom of floating overhead traveling crane, and the tail end of the wirerope is fixed on
On earrings screw, the head end of wirerope around multi-turn coiling after the directive wheel of displacement compensating mechanism I on the sheave of center, subsequent steel
The head end of cord around displacement compensating mechanism II directive wheel after be fixed on well drilling hoist;
S22, the heave movement of platform is considered as to single SIN function wave, uses ocean wave motion cycle T and vibration
Width Δ z may be expressed as:
S23, Frictional model, passive compensation part and dynamic balance hydraulic cylinder and Active Compensation hydraulic cylinder are placed parallel,
To analyze the friction effects that the compensating hydraulic cylinder of crown-block heave compensator generates in movement compensation process, in Simulation Example
In process of calculation analysis, in conjunction with three above formula, from overhead traveling crane heave compensation process passive compensation part and Active Compensation
It is studied in terms of part two.
The overhead traveling crane heave compensation system simulation model, main in 20-Sim software there are four results to export, respectively
For Bottom Hole Bit Weight In A, wave speed, wave position and Position of Hydraulic Cylinder.
The invention has the following advantages that the method for the present invention it is simple, can be from the passive compensation in overhead traveling crane heave compensation process
The frictional force in compensation process is studied in terms of part and Active Compensation part two, is the high liter with long service life of designed reliability
Heavy compensation device makes tremendous contribution.
Detailed description of the invention
Fig. 1 is drill bit curve of load when crown-block heave compensator passively compensates;
Drill bit curve of load when Fig. 2 is crown-block heave compensator Active Compensation;
Fig. 3 is the structural schematic diagram of overhead traveling crane heave compensation system simulation model.
Specific embodiment
The present invention will be further described below, and protection scope of the present invention is not limited to as described below:
A kind of friction mechanical analyzing method of the passive type deep-sea heave compensator for ocean platform drilling well, it includes
Compensation process friction mechanical analysis and frictional damping influence simulation analysis;
Compensation process friction mechanical analysis the following steps are included:
Pressure loss amount in S11, calculating heave compensator in fluid pressure line:
Wherein, L is hydraulic line length;DlFor the diameter of hydraulic line;λ is coefficient of friction;ρ is hydraulic in hydraulic line
The density of oil;VlThe flowing velocity for being hydraulic oil in hydraulic line;
S12, the frictional force F when consideration generation in main hydraulic cylinderfWhen, the frictional force for obtaining a relative constant speed is steady
States model is as follows:
It is carried out in analytic process using simulation software 20-Sim, Frictional model may be expressed as:
Wherein, FfFor the frictional force in main hydraulic cylinder;FcFor Coulomb friction power;FsFor this Trebek frictional force;σvIt is viscous
Stagnant coefficient of friction;kpFor pressure term coefficient relevant to friction;P is the pressure in main hydraulic cylinder;ξ is Coulomb friction force curve
Steepness;vsFor this Trebek speed;Speed of the v between contact surface;
The frictional damping influence simulation analysis the following steps are included:
S21, overhead traveling crane heave compensation system simulation model, the structure of simulation model such as Fig. 1 are set up using 20-Sim software
Shown, simulation model includes floating drilling platform 1, the rack 2 for being set to 1 top of floating drilling platform and is set to rack 2
Earrings screw 4 and well drilling hoist, earrings screw 4 and well drilling hoist are arranged at the top of floating drilling platform 1 for the Drilling derrick 3 at top
It is located at the left and right sides of rack 2, vertically arranged guide groove, sliding in the guide groove are provided in the Drilling derrick 3
Floating overhead traveling crane 7 is installed, the center sheave 8 for offering multiple tracks wire casing on its cylinder, wirerope are rotatably installed in floating overhead traveling crane 7
12, the displacement compensating mechanism I and right displacement compensating mechanism II of 2 left and right sides of rack, the displacement compensating mechanism I are respectively arranged at
It is symmetrical set with right displacement compensating mechanism II;Displacement compensating mechanism I includes first connecting rod 13, second connecting rod 14, directive wheel
15 and compensation hydraulic oil cylinder 16, the lower end of first connecting rod 13 is articulated with 2 top of rack, and the other end of first connecting rod 13 is articulated with
The middle part of directive wheel 15, one end of second connecting rod 14 are articulated with the middle part of directive wheel 15, and the other end of second connecting rod 14 is articulated with
The middle part of center sheave 8, compensation hydraulic oil cylinder 16, which is tilted to the right, to be set up, and the cylinder barrel of compensation hydraulic oil cylinder 16 is articulated with rack
On 2, the piston rod of compensation hydraulic oil cylinder 16 is articulated with the bottom of floating overhead traveling crane 7, and the tail end of the wirerope 12 is fixed on earrings
On screw 4, the head end of wirerope 12 around multi-turn coiling after the directive wheel 15 of displacement compensating mechanism I on center sheave 8, then
The head end of wirerope 12 around displacement compensating mechanism II directive wheel 15 after be fixed on well drilling hoist;
S22, the heave movement of platform is considered as to single SIN function wave, uses ocean wave motion cycle T and vibration
Width Δ z may be expressed as:
S23, Frictional model, passive compensation part and dynamic balance hydraulic cylinder and Active Compensation hydraulic cylinder are placed parallel,
To analyze the friction effects that the compensating hydraulic cylinder of crown-block heave compensator generates in movement compensation process, in Simulation Example
In process of calculation analysis, in conjunction with three above formula, from overhead traveling crane heave compensation process passive compensation part and Active Compensation
It is studied in terms of part two.
The overhead traveling crane heave compensation system simulation model, main in 20-Sim software there are four results to export, respectively
For Bottom Hole Bit Weight In A, wave speed, wave position and Position of Hydraulic Cylinder.
By the friction mechanical analysis and frictional damping analysis to overhead traveling crane heave compensation system simulation model, following knot is obtained
By:
As shown in Figure 1 it is drill bit curve of load when crown-block heave compensator passively compensates, is not considering hydraulic cylinder in figure
Frictional force exist to Bottom Hole Bit Weight In A influence of fluctuations under conditions of, the fluctuation amplitude of load at any time on drill bit in range, and
Smooth sinus fluctuation is presented in integrated curved;And there are frictional damping and cause compensating hydraulic cylinder with the presence of pressure drop in consideration hydraulic cylinder
When, crown-block heave compensator is larger to the decline of the compensation efficiency of drilling platforms heave movement, and shaft bottom drill bit load is at any time at this time
Between the wavy fluctuation of apparent approximate triangle is presented, the fluctuation amplitude of curve quickly changes in range.Overhead traveling crane is heaved and is mended
When repaying device and being in passive compensating coefficient, the influence that the frictional force generated in hydraulic cylinder fluctuates Bottom Hole Bit Weight In A is obvious, and curve
It changes with time and rapid fluctuations, while increases curve fluctuation amplitude by 2.03 times.
Drill bit curve of load when being illustrated in figure 2 crown-block heave compensator Active Compensation is not considering hydraulic cylinder in figure
Under conditions of internal friction exists to Bottom Hole Bit Weight In A influence of fluctuations, the fluctuation amplitude of load at any time on drill bit is in 2.5kN model
In enclosing, smooth sinus fluctuation is also presented in integrated curved;And there are frictional damping and lead to compensating hydraulic cylinder in consideration hydraulic cylinder
In the presence of having pressure drop, crown-block heave compensator declines the compensation efficiency of drilling platforms heave movement, and shaft bottom is bored at this time
The wavy fluctuation of near sinusoidal is presented in head load at any time, but has oscillation on small scale phenomenon when curve fluctuates at peak value and make song
Line peak value further increases, and the fluctuation amplitude of curve changes within the scope of 4.7kN.It has the initiative for crown-block heave compensator
When compensating coefficient, the frictional force generated in hydraulic cylinder has an impact to Bottom Hole Bit Weight In A fluctuation, so that curve fluctuation amplitude increases by 88%,
And curve has when changing over time oscillation on small scale to increase phenomenon to occur at peak value.
By two above curve graph it is found that under the conditions of considering frictional force and not considering two kinds of frictional force, overhead traveling crane heave is mended
Repay device during to drilling platforms heaving movement compensation in passive compensation and Active Compensation state when, main compensation is hydraulic
The frictional force generated in cylinder influences device entire compensation efficiency in different size.Under the conditions of considering frictional force, overhead traveling crane heave is mended
The shaft bottom drill bit load amplitude fluctuations that change with time for repaying the passive compensating coefficient of device are 2.45 times of Active Compensation state;Such as
Under the conditions of not considering frictional force, drill bit load amplitude fluctuation when in passive compensating coefficient is the 1.52 of Active Compensation state
Times.
By can be obtained after Simulation Example analysis, the compensation efficiency height of crown-block heave compensator depends on compensating brill
Pivot bur Bottom Hole Bit Weight In A fluctuation range, when the device during heaving movement compensation be in passive compensating coefficient and use
When dynamic balance oil cylinder, the frictional force generated in main compensation hydraulic cylinder has a significant impact to device entire compensation performance;When this
Device have the initiative during heaving movement compensation compensating coefficient when, the frictional force generated in compensating hydraulic cylinder is to device entirety
Compensation performance influences smaller.