US 2021/0199535 A1Published application

Test device for simulating longitudinal-lateral-torsional coupled nonlinear vibration of drill string of deepwater riserless drilling and method therefor

AssigneesSouthwest Petroleum University, Chengdu University of Technology

InventorsJun LIU, Xiaoqiang GUO, Qingyou LIU, Yufa HE, Anchao WEI, Linlin ZENG, Jianxun WANG

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Abstract

The present invention discloses a testing device and method for simulating longitudinal-transverse-torsional coupled nonlinear vibration of a drill string in deep-water riser-free drilling. The testing device comprises a pool (1), a motor (2) and a hook load adjustment device (3), wherein a guide wheel (4) is provided on the top of the pool (1); a support seat A (5) and a support seat B (6) are fixed on the bottom surface of the pool (1); an organic glass tube (8) is fixed between the support seat A (5) and the support seat B (6); a casing (9) is respectively provided on the top surface of the support seat B (6) and the top surface of the trailer (7); the left end of the plastic tube (10) extends into the organic glass tube (8) along the axis of the organic glass tube (8). The present invention further discloses a simulation method. The present invention has the following beneficial effects: the structure is compact; the longitudinal-transverse-torsion coupled vibration responses of the drill string under different rotating speeds of the drill string, ocean flow rates, flow rates of the drilling fluid, torsional excitations and longitudinal excitations at the bottom of the formation section is simulated, thereby filling up the blank in the riser-free drilling system.

Claims8

Dependent claims

A testing device for simulating longitudinal-transverse-torsional coupled nonlinear vibration of a drill string in deep-water riser-free drilling, comprising a pool (1), a motor (2) and a hook load adjustment device (3), wherein a guide wheel (4) is provided on the top of the pool (1);

a support seat A (5), a support seat B (6) and a trailer (7) are provided on the bottom surface of the pool (1) in sequence from left to right;
the support seat A (5) and the support seat B (6) are fixed on the bottom surface of the pool (1);
an organic glass tube (8) is fixed between the support seat A (5) and the support seat B (6);
a casing (9) is respectively provided on the top surface of the support seat B (6) and the top surface of the trailer (7);
a plastic tube (10) passes through a space between the two casings (9);
the left end of the plastic tube (10) extends into the organic glass tube (8) along the axis of the organic glass tube (8), and a vibration exciter (11) is fixed on the left extension end;
the right end of the plastic tube (10) extends to the right and extends out of the right casing (9), and the right extension end is connected with an output shaft of the motor (2) through a coupling;
a steel wire rope (12) is fixed on the right extension end of the plastic tube (10);
the other end of the steel wire rope (12) bypasses the guide wheel (14) and is connected with a spring (13) and a tension gauge (14) in sequence, and the other end of the tension gauge (14) is connected with the hook load adjustment device (3);
a fluid outlet joint and a fluid inlet joint are provided on the left and right ends of the plastic tube (10) respectively and are communicated with the plastic tube (10);
a drilling fluid outlet tube (33) is connected to the fluid outlet joint, and a recycling tank (26) which is located outside the pool (1) is connected to the other end of the drilling fluid outlet tube (33);
a drilling fluid inlet tube (15) is connected to the fluid inlet joint, and a flowmeter (16) and a circulating pump (17) are connected to the other end of the drilling fluid inlet tube in sequence;
the testing device further comprises a three-way displacement sensor (18), a computer (19), a resistance strain gauge (20), a charge amplifier (21), a signal acquisition instrument (22) and a plurality of strain foils (23);
the three-way displacement sensor (18) and the strain foils (23) are provided on a cylindrical surface of the plastic tube (10) in the support seat B (6) and trailer (7) section;
the three-way displacement sensor (18) is connected to the charge amplifier (21) via a signal line A (24);
the strain foils (23) are connected to the resistance strain gauge (20) through a signal line B (25);
the resistance strain gauge (20) and the charge amplifier (21) are both connected to the signal acquisition instrument (22) through wires;
and the signal acquisition instrument (22) is connected to an input interface of the computer (19) through a wire.

15 more elements

A testing method for simulating longitudinal-transverse-torsional coupled nonlinear vibration of a drill string in deep-water riser-free drilling, comprising the following steps:

S1:
a circulating pump (17) is turned on to pump a drilling fluid into a plastic tube (10) through a flowmeter (16), a drilling fluid inlet tube (15), and a fluid inlet joint in sequence;
the flowmeter (16) monitors a flow rate of the drilling fluid;
after the flow rate is stable, a three-way displacement sensor (18) detects a transverse displacement and a longitudinal displacement of the plastic tube (10) in an ocean section, and transmits a signal to a charge amplifier (21) via a signal line A (24);
the charge amplifier (21) transmits the signal to a signal acquisition instrument (22);
the signal acquisition instrument (22) then transmits the signal to a computer (19);
the computer stores data, and strain foils (23) detect a stress of the plastic tube (10) in the ocean section, and transmit the signal to the resistance strain gauge (20) via a signal line B (25);
the resistance strain gauge (20) transmits the signal to the signal acquisition instrument (22), the signal acquisition instrument (22) transmits the signal to the computer (19), and the computer stores data;
S2. a rotating speed of the circulating pump (17) is changed to change the flow rate of the drilling fluid;
the step S1 is repeated to measure longitudinal displacements, transverse displacements and stress responses of the plastic tube (10) in a seawater section under different flow rates of the drilling fluid, so as to simulate the drill string vibration caused by the flow of the drilling fluid;
S3:
the circulating pump (17) is turned off, and a hook load adjustment device (3) is turned on;
the hook load adjustment device (3) outputs a simple harmonic load which is transmitted to the plastic tube (10) through a tension gauge (14), a spring (13) and a steel wire rope (12);
the tension gauge (14) monitors the magnitude of the load;
after the load is stable, the three-way displacement sensor (18) detects a transverse displacement and a longitudinal displacement of the plastic tube (10) in the ocean section, and transmits a signal to the charge amplifier (21) via the signal line A (24);
the charge amplifier (21) transmits the signal to the signal acquisition instrument (22);
the signal acquisition instrument (22) then transmits the signal to the computer (19);
the computer stores data, and meanwhile, the strain foils (23) detect the stress of the plastic tube (10) in the ocean section, and transmits the signal to the resistance strain gauge (20) via the signal line B (25);
the resistance strain gauge (20) transmits the signal to the signal acquisition instrument (22), the signal acquisition instrument then transmits the signal to the computer (19), and the computer stores data;
S4:
the simple harmonic load output by the hook load adjustment device (3) is changed;
the step S3 is repeated to measure longitudinal displacements, transverse displacements and stress responses of the plastic tube (10) in a seawater section under different simple harmonic loads of the plastic tube (10), so as to simulate the drill string vibration caused by the movement of the drilling platform;
S5:
a vibration exciter (11) is turned on;
the vibration exciter (11) applies a torsional excitation and a longitudinal excitation to the left end of the plastic tube (10);
the three-way displacement sensor (18) detects a transverse displacement and a longitudinal displacement of the plastic tube (10) in the ocean section, and transmits a signal to the charge amplifier (21) via the signal line A (24);
the charge amplifier (21) transmits the signal to the signal acquisition instrument (22), and the signal acquisition instrument (22) then transmits a signal to the computer (19);
the computer stores data, and meanwhile the strain foils (23) detect a stress of the plastic tube (10) in the ocean section, and transmit the signal to the resistance strain gauge (22) via the signal line B (25);
the resistance strain gauge (20) transmits the signal to the signal acquisition instrument (22), the signal acquisition instrument (22) then transmits the signal to the computer (19), and the computer stores data, thereby simulating the vibration of the drill pipe when a drill bit drills the seabed;
S6:
the vibration exciter (11) is turned off, and the trailer (7) is dragged horizontally and reciprocally to the left or right to simulate the flow of seawater, such that the trailer drives the plastic tube (10) to move;
after the dragging speed is stable, the three-way displacement sensor (18) detects a transverse displacement and a longitudinal displacement of the plastic tube (10) in the ocean section, and transmits a signal to the charge amplifier (21) via the signal line A (24);
the charge amplifier (21) transmits the signal to the signal acquisition instrument (22);
the signal acquisition instrument (22) then transmits the signal to the computer (19);
the computer stores data, and meanwhile, the strain foils (23) detect the stress of the plastic tube (10) in the ocean section, and transmit the signal to the resistance strain gauge (20) via the signal line B (25);
the resistance strain gauge (20) transmits the signal to the signal acquisition instrument (22), the signal acquisition instrument (22) then transmits the signal to the computer (19), and the computer stores data;
S7:
the dragging speed of the trailer (7) is changed;
the step S6 is repeated to measure longitudinal displacements, transverse displacements and stress responses of the plastic tube (10) in a seawater section under different dragging speeds of the trailer (7), so as to simulate the drill string vibration caused by different ocean current speeds;
S8:
the trailer (7) is not dragged and the motor (2) is turned on;
the motor (2) drives the plastic tube (10) to rotate around its axis;
after the rotating speed is stable, the three-way displacement sensor (18) detects a transverse displacement and a longitudinal displacement of the plastic tube (10) in the ocean section, and transmits a signal to the charge amplifier (21) via the signal line A (24);
the charge amplifier (21) transmits the signal to the signal acquisition instrument (22);
the signal acquisition instrument (22) then transmits the signal to the computer (19);
the computer stores data, and meanwhile, the strain foils (23) detect a stress of the plastic tube (10) in the ocean section, and transmits the signal to the resistance strain gauge (20) via the signal line B (25);
the resistance strain gauge (20) transmits the signal to the signal acquisition instrument (22), the signal acquisition instrument (22) then transmits the signal to the computer (19), and the computer stores data;
and
S9:
an output rotating speed of the motor (2) is changed;
the step S8 is repeated to measure longitudinal displacements, transverse displacements and stress responses of the plastic tube (10) in a seawater section under different rotating speeds, so as to simulate the drill pipe vibration caused by different rotating speeds.

48 more elements

Dependencies are inferred from the claim text.