1. An underbalance pressure generator device, comprising:
a housing having a first end, a second end, and an implosion chamber defined between the first and second ends;
one or more influx ports defined in the housing and enabling fluid communication between the implosion chamber and an exterior of the housing;
at least one frangible member fixedly attached to the housing and fluidly isolating at least a portion of the implosion chamber from the exterior of the housing; and
an actuation device arranged within the housing and including an extendable rod axially translatable within the implosion chamber and a piercing member coupled to the extendable rod to engage and rupture the at least one frangible member when the actuation device is triggered.
2. The device of claim 1, further comprising a fluid port defined in the housing to place the implosion chamber in fluid communication with a low-pressure source, wherein fluid is evacuated from the implosion chamber via the fluid port in order to generate a pressure differential across the at least one frangible member.
3. The device of claim 1, wherein the at least one frangible member is arranged in an interior of the implosion chamber and the piercing member disposed on a distal end of the extendable rod.
4. The device of claim 1, wherein the one or more influx ports are radial influx ports and the at least one frangible member comprises a frangible member arranged in each radial influx port, and wherein the piercing member is coupled to the extendable rod by being coupled to an end of one or more radial arms pivotably arranged on the extendable rod, the one or more radial arms being radially movable to rupture the frangible member arranged in each radial influx port when the extendable rod moves axially.
5. The device of claim 1, wherein the at least one frangible member is at least one of a burst disc, a rupture disc, a burst diaphragm, and a blowout panel.
6. The device of claim 1, wherein the actuation device is triggered upon receiving an axial load from a jarring tool.
7. The device of claim 1, further comprising a control line communicably coupled to the actuation device, wherein the actuation device is a device selected from the group consisting of a mechanical actuation device, an electromechanical actuation device, a hydraulic actuation device, and a pneumatic actuation device.
8. The device of claim 7, further comprising:
one or more sensors communicably coupled to the control line for determining depth of the device within a wellbore; and
a control module communicably coupled to the control line and the one or more sensors for communicating the depth of the device to a surface location.
9. A method, comprising:
conveying an underbalance pressure generator device into a wellbore having one or more perforation channels defined therein, the underbalance pressure generator device including a housing defining an implosion chamber that extends between a first end and a second end of the housing and at least one frangible member is fixedly attached to the housing;
generating a pressure differential across the at least one frangible member;
triggering an actuation device arranged within the housing, the actuation device including an extendable rod axially translatable within the implosion chamber and a piercing member coupled to the extendable rod;
engaging and thereby rupturing the at least one frangible member with the piercing member upon triggering the actuation device;
drawing wellbore fluids into the implosion chamber via one or more influx ports defined in the housing and thereby creating a pressure underbalance in an annulus defined between the wellbore and the housing; and
drawing scale and debris out of the one or more perforation channels in response to the pressure underbalance in the annulus.
10. The method of claim 9, wherein generating the pressure differential across the at least one frangible member precedes conveying the underbalance pressure generator device into the wellbore.
11. The method of claim 9, wherein generating the pressure differential across the at least one frangible member comprises evacuating fluids from the implosion chamber via a fluid port defined in the housing.
12. The method of claim 9, wherein the at least one frangible member is arranged in an interior of the implosion chamber and rupturing the at least one frangible member comprises:
axially translating the extendable rod within the implosion chamber; and
engaging and rupturing the at least one frangible member with piercing member disposed on a distal end of the extendable rod.
13. The method of claim 9, wherein the one or more influx ports are radial influx ports and the at least one frangible member comprises a frangible member arranged in each radial influx port, and wherein rupturing the at least one frangible member comprises:
axially translating the extendable rod within the implosion chamber;
radially moving one or more radial arms pivotably arranged on the extendable rod as the extendable rod axially translates, wherein the piercing member is coupled to the extendable rod by being coupled to an end of the one or more radial arms; and
rupturing the frangible member arranged in each radial influx port with the piercing member coupled to the one or more radial arms.
14. The method of claim 9, wherein triggering the actuation device comprises conveying an axial load to the actuation device from a jarring tool.
15. The method of claim 9, wherein triggering the actuation device comprises:
sending one or more control signals from a computer arranged at a surface location to a control module; and
operating the actuation device with the control module based on receipt of the one or more control signals.
16. The method of claim 15, further comprising:
determining a depth of the underbalance pressure generator device within the wellbore with one or more sensors communicably coupled to the control line; and
communicating the depth of the underbalance pressure generator device to a surface location with a control module communicably coupled to the control line and the one or more sensors.
17. The method of claim 9, further comprising triggering the actuation device once a predetermined time has elapsed.
18. The method of claim 9, wherein the underbalance pressure generator device further includes one or more sensors, and wherein triggering the actuation device further comprises:
sensing a pressure within the wellbore with the one or more sensors; and
triggering the actuation device once a predetermined pressure is sensed by the one or more sensors.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A work vehicle comprising an engine and an engine-stop switch device of said work vehicle configured to stop said engine from operating,
said engine-stop switch device including:
a case;
an operation unit attached to said case and moving, at a front side of said case, between a first operational position of permitting said engine to start and a second operational position of stopping said engine from operating and inhibiting said engine from starting;
an operation unit cover moving between a position of covering said operation unit and a position of exposing said operation unit, and holding said operation unit at said first operational position while said operation unit cover is at the position of covering said operation unit;
a housing covering lateral sides and a top side of said case that cross said front side of said case and exposing said operation unit cover from said front side; and
a pivoting member pivoting about a pivoting member’s pivot shaft located above said operation unit cover, between a closed position of covering said operation unit cover and an opened position of exposing said operation unit cover and, while said pivoting member is at said closed position, said pivoting member forming a closed space, between said pivoting member and said housing, for accommodating at least said operation unit cover in the closed space and holding said operation unit cover at said position of covering said operation unit.
2. The work vehicle according to claim 1, wherein said pivoting member at its position of opening to a maximum extent for exposing said operation unit cover protrudes in a direction of said front side and inclines with respect to a vertical line extending across said pivoting member’s pivot shaft, as seen in a side view.
3. The work vehicle according to claim 1, wherein
said pivoting member has an inner surface which is located opposite to said operation unit while said pivoting member is at said closed position, and
said inner surface has a slide portion where said operation unit cover slides while said pivoting member is pivoted from said opened position to said closed position.
4. The work vehicle according to claim 3, wherein
said inner surface has a flat surface which is said slide portion, and an elastic member located at a position closer to said pivoting member’s pivot shaft relative to said slide portion, and
said elastic member contacts said operation unit cover while being at said closed position.
5. The work vehicle according to claim 1, wherein said pivoting member is shaped to externally enclose said front side of lateral surfaces and said front side of a bottom portion of said housing while being at said closed position.
6. The work vehicle according to claim 1, further comprising:
a driver seat; and
a canopy covering from above said engine-stop switch device and said driver seat.