CN201310310Y - Throttle control device for under balance pressure drilling - Google Patents

Abstract

The utility model relates to a throttle control device for under balance pressure drilling, which belongs to the technical field of petroleum gas drilling well device manufacture. The throttle control device for under balance pressure drilling is used for automatically controlling well head pressure when petroleum gas is explored and developed in an under balance pressure drilling process. The throttle control device for under balance pressure drilling comprises a throttle device and a control device, wherein the throttle device comprises a hydraulic throttle valve and a manual throttle valve, and the control device comprises a hydraulic pump, an energy storage, an oil tank, a hydraulic sensor and an actuating mechanism. The utility model designs the throttle control device for under balance pressure drilling, which can automatically regulate the opening of the throttle valve and automatically control drilling liquid returning from the well, and the like by remotely and intensively controlling the throttle value. The throttle control device solves the problems in the prior art that the opening of the throttle device is still manually controlled, the well head pressure can not be accurately controlled, and the pressure fluctuation is large; and the throttle device and the control device are provided with a pressure collecting and controlling mechanism. The utility model can realize the purpose that the drilling liquid returning from the well, and the like can be automatically controlled in a setting pressure range in the under balance pressure drilling process.

Description

The under balance pressure drilling throttle control device

Technical field:

A kind of under balance pressure drilling throttle control device is used for petroleum natural gas exploration and uses the well head pressure of under balance pressure drilling process to control automatically, belongs to oil and gas well drilling equipment manufacturing technology field.

Background technology:

In the petroleum natural gas exploration drilling process, particularly adopt underbalance drilling mode to implement in the process of drilling well, for the medium that adopts in the drilling process does not destroy the reset condition of down-hole payzone or does not pollute the produce oil gas pay of down-hole, the quality that is used for the medium of drilling well will be equal to or less than underground fluid mass, in this case, when opening oil and gas reservoir, owing to enter the light weight of the quality of the drilling well medium in the well than borehole fluid, will upwards go out ground so be higher than the oil or the natural gas of drilling well mass of medium in the payzone of down-hole, in order to guarantee the safety of drilling well, need controlledly return out ground so enter the drilling well medium and the fluid in the payzone of down-hole of down-hole, in implementing the under balance pressure drilling process, construct at present for the under balance pressure drilling of carrying out that control is arranged, main method and the equipment that adopts is at the floor mounted choke manifold, realize underground high-pressure fluid is had the discharging of control by the throttle valve opening in the control choke manifold and other by-pass valve controls, the shortcoming of these technology is at present: still adopt the manually aperture of control choke valve, what make drilling fluid equal pressure fluid in the well has returning out of control, these work mainly are that the aperture by workman's frequent manual adjustments choke valve spool in the process of wellbore construction realizes, present mode is owing to be artificial mode, be difficult to judge the exact position of spool aperture, particularly under urgent situation, because the neural anxiety that is in height, also might make a fault, make well head pressure control inaccurate, cause pressure oscillation big, and personnel in case of emergency enter manifold and operate the danger that the person also takes place easily.

The utility model content:

The purpose of this utility model is the shortcoming at prior art, adopt the mode of remote centralized control choke valve, design and a kind ofly can regulate throttle valve opening automatically, have the under balance pressure drilling throttle control device of the fluids such as drilling fluid that automatic control well internal return goes out according to setup parameter.

The utility model is achieved in that the utility model comprises throttling and control device, throttling arrangement is made of choke valve, comprise and surging and manual throttle valve, the choke valve that surges is arranged on one side of wellhead manifold front end, control device comprises hydraulic pump, accumulator, fuel tank, hydrostatic sensor and actuator, one end of actuator connects accumulator and fuel tank, and the other end connects the choke valve that surges; The manual throttle valve that is arranged on wellhead manifold front end another side is in normal off status, is realized the automatic control of down-hole liquid according to the parameter of setting by the choke valve that surges; Hydraulic pump comprises an air-driven hydraulic pump and a hydraulic hand-pump, the imbibition end of hydraulic pump is connected with fuel tank, its outlet end is connected with accumulator, the outlet end of accumulator connects the liquid feeding end of actuator, in actuator, be provided with controlling computer, actuator is connected on the opening and closing two ends of the choke valve fluid cylinder that surges by pipeline, is connected by cable on the hydrostatic sensor of the choke valve that surges; The spool of choke valve and manual throttle valve of surging has pressure buffer mechanism, and a buffer that is made of spring is arranged in the spool of pressure buffer mechanism; The utility model provides power by external source of the gas to air-driven hydraulic pump, the hydraulic oil that air-driven hydraulic pump produces is stored in the accumulator, also can produce hydraulic oil by hydraulic hand-pump when air driven pump breaks down is the accumulator supercharging, when needs, according to the parameter of setting, hydraulic oil in the accumulator can enter the unlatching chamber of the choke valve fluid cylinder that surges respectively or close the chamber, reaches the purpose of control throttle valve opening; The hydrostatic sensor that is arranged on the choke valve that surges is connected with actuator, when the fluids such as drilling fluid that return out in the well enter choke valve, the pressure signal that produces is passed to the controlling computer in the actuator, controlling computer is controlled the oil mass that enters the choke valve fluid cylinder that surges by analysis automatically, the aperture of regulating spool, the constant pressure differential that makes the fluids such as drilling fluid that return out in the well is in setting value.

The beneficial effects of the utility model are: the throttling of setting and control device have the function of pressure acquisition and control, the purpose that the fluids such as drilling fluid that the well internal return goes out in the time of can realizing under balance pressure drilling are controlled in the setting pressure scope automatically, and do not need artificial frequent operational administrative, and be long-range operation, the purpose that not only can reach constant control well inner fluid also can not cause danger to operating personnel; The choke valve that surges that has pressure buffer mechanism can have and slow down the effect that spool is washed away to the pressure oscillation realization automatic adjusting among a small circle of downhole fluid in the scope of setting pressure parameter; When control device breaks down, can utilize the fluids such as manual throttle valve adjusting well head drilling fluid that are arranged on the choke manifold opposite side in certain back pressure scope, continue the control of under-balance drilling operation wellhead back pressure.

Description of drawings:

Fig. 1 is the partial sectional view of the utility model mounting arrangements and choke valve.

The specific embodiment:

Provide embodiment of the present utility model below in conjunction with accompanying drawing: the utility model comprises throttling and control device, throttling arrangement is made of the choke valve that surges, comprise surge a choke valve 12 and a manual throttle valve, the choke valve 12 that surges is arranged on one side of well head front end four-way, and manual throttle valve is arranged on the another side of wellhead manifold front end four-way; Control device comprises hydraulic pump, accumulator 1, fuel tank 3, hydrostatic sensor 11 and actuator 7, one end of actuator 7 is connected accumulator 1 and fuel tank 3 by pipeline 5 with 6, the other end connects the choke valve 12 that surges, hydraulic pump comprises an air-driven hydraulic pump 2 and a hydraulic hand-pump 4, air-driven hydraulic pump 2 produces power by outside air feed, the imbibition end of hydraulic pump is connected with fuel tank 3, outlet end is connected with accumulator 1, during normal construction, manual throttle valve is in normal off status, is realized the automatic control of down-hole liquid automatically according to the parameter of setting by the choke valve 12 that surges; Be provided with the controlling computer that can programme in actuator 7, actuator 7 is connected the two ends of the choke valve 12 opening and closing fluid cylinders that surge by pipeline 8 with 9, be connected by cable 10 on the hydrostatic sensor 11 of the choke valve 12 that surges; Described surge and the spool 14 of manual throttle valve has pressure buffer mechanism 13, a buffer that is made of spring is arranged in the spool 14 of pressure buffer mechanism 13, the pressure oscillation that reduces wellhead back pressure can be played by pressure buffer mechanism 13, improves the ability to sprint and the application life of high-pressure fluids such as spool 14 anti-drilling fluids; The utility model provides power for air-driven hydraulic pump 2 by external source of the gas, the hydraulic oil that air-driven hydraulic pump 2 produces is stored in 1 li of accumulator, also can produce hydraulic oil by hydraulic hand-pump 4 when air-driven hydraulic pump 2 breaks down is accumulator 1 supercharging, when needs, according to the parameter of setting, hydraulic oil in the accumulator 1 can enter the unlatching chamber of choke valve 12 fluid cylinders that surge respectively or close the chamber, the aperture of control choke valve, and oil return is back in the fuel tank 3 by pipeline 6; The hydrostatic sensor 11 that is arranged on the choke valve 12 that surges is connected with actuator 7 by cable 10, when the fluids such as drilling fluid that return out in the well enter when surging choke valve 12, the spool 14 of choke valve 12 of surging produces certain barrier effect, when if the pressure differential that forms is higher or lower than under balance pressure drilling technology requirement setting value, pressure signal can import in the actuator 7, signal is distinguished by controlling computer, connect the passage that accumulator 1 leads to the choke valve 12 that surges, hydraulic oil in the accumulator 1 enters the fluid cylinder of the choke valve 12 that surges, the surge liquid cylinder piston of choke valve 12 of promotion is done corresponding moving, the surge aperture of choke valve 12 spools 14 of adjusting, the constant pressure differential that makes the fluids such as drilling fluid that return out in the well is in setting value, because the high-pressure fluid of down-hole can produce bigger impact force and fluctuation when knocking the spool 14 of the choke valve 12 that surges, therefore, the pressure buffer mechanism 13 that is arranged in the spool 14 can make spool 14 do adjustment up and down automatically under the effect of buffer, slow down this impact force and fluctuation, when surge choke valve or control device break down, the wellhead back pressure control in the time of can continuing under-balance drilling operation by manual throttle valve.

Claims (3)

1, a kind of under balance pressure drilling throttle control device comprises throttling and control device, it is characterized in that:

Described throttling arrangement is made of the choke valve that surges, and the choke valve that surges is arranged on one side of wellhead manifold front end four-way; Described control device comprises hydraulic pump, accumulator, fuel tank, hydrostatic sensor and actuator, and an end of actuator connects accumulator and fuel tank, and the other end connects the choke valve that surges.

2, under balance pressure drilling throttle control device according to claim 1, it is characterized in that: the described actuator other end is to be connected on the two ends of opening and closing hydraulic cylinder of the choke valve that surges by pipeline, is connected by cable on the hydrostatic sensor of the choke valve that surges.

3, under balance pressure drilling throttle control device according to claim 1, it is characterized in that: the spool of described choke valve has pressure buffer mechanism, and a buffer that is made of spring is arranged in the spool of pressure buffer mechanism.