CN103206180A - System and method for controlling dropping speed of bottom-hole pressure of coal-bed gas well - Google Patents
System and method for controlling dropping speed of bottom-hole pressure of coal-bed gas well Download PDFInfo
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- CN103206180A CN103206180A CN2013101278537A CN201310127853A CN103206180A CN 103206180 A CN103206180 A CN 103206180A CN 2013101278537 A CN2013101278537 A CN 2013101278537A CN 201310127853 A CN201310127853 A CN 201310127853A CN 103206180 A CN103206180 A CN 103206180A
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Abstract
The invention discloses a system and a method for controlling the dropping speed of the bottom-hole pressure of a coal-bed gas well. The system is used for controlling the dropping speed of the bottom-hole pressure in a drainage mode implemented by the aid of a jet pump, and comprises a central controller, a pressurizer, a power hydraulic pressure gauge, an automatic flow control instrument and a bottom-hole pressure gauge; the central controller is used for regulating the pressure on power fluid according to a pressure value, which is measured by the power hydraulic pressure gauge, of the power fluid, and the pressure is exerted by the pressurizer to the power fluid; the power hydraulic pressure gauge is used for measuring the pressure value of the pressure fluid; the pressurizer is used for pressurizing the power fluid according to an instruction of the central controller; the central controller is further used for regulating a target value of an injection rate according to a bottom-hole pressure value which is measured by the bottom-hole pressure gauge and transmitting the target value of the injection rate to the automatic flow control instrument; the bottom-hole pressure gauge is used for measuring the bottom-hole pressure value; and the automatic flow control instrument is used for regulating the injection rate of the power fluid according to the received target value, which is transmitted by the central controller, of the injection rate. The system and the method have the advantage that the bottom-hole pressure of the coal-bed gas well can be controlled in the drainage mode implemented by the aid of the jet pump.
Description
Technical field
The present invention relates to coal bed gas ground row and adopt the field, particularly the system and method for the bottom pressure decrease speed of control coal bed gas well.
Background technology
Adopt in the process coal bed gas ground row, require bottom pressure can be continuously, steadily, descend lentamente, thereby realize discharging bottom pressure, can not influence the target of reservoir permeability again because of the acute variation of bottom pressure.
In the prior art, carry out the coal bed gas well array when adopting, mostly adopt tubing pump or screw pump row to adopt mode.Adopt tubing pump row to adopt mode, the down-hole has mechanical moving element to do to pump when row adopts, therefore have inclination section or pit shaft rate of over-all angle change when big slightly when the pit shaft of coal bed gas well itself, cause moving component and pit shaft generation eccentric wear easily, therefore equipment or down-hole string are adopted by the row of damage.Adopt screw pump row to adopt mode, the down-hole has mechanical part to move reciprocatingly equally when row adopts, and the directed coal bed gas well for having certain slope can produce the eccentric wear phenomenon equally.In addition, adopt tubing pump or screw pump row to adopt mode, usually can follow at the initial stage of adopting row and tell the sand phenomenon, tubing pump row adopts mode and screw pump row adopts the influence that mode is subjected to the sand card easily, therefore is forced to interrupt row and adopts, and carry out unfreezing and drag for the sand operation.Above-mentioned eccentric wear and sand card phenomenon can cause that row adopts the process interruption, cause the decline of bottom pressure no longer continuously steadily.
Because the above-mentioned shortcoming that tubing pump or the screw pump row mode of adopting have adopts the jet pump row mode of adopting to carry out the coal bed gas well array and adopts, can solve the problem of eccentric wear and sand card.Adopt jet pump row to adopt mode, do not have mechanical moving element in the down-hole, therefore long-term row adopts and does not have the eccentric wear phenomenon.The jet pump row mode of adopting is specially: give birth to negative pressure appearance by the liquid miscarriage of injecting the high speed power fluid in pit shaft, thereby draw the liquid flow back into ground in the pit shaft.This process itself has prop-carrying capacity preferably, therefore the influence that is not easy to be subjected to telling sand.
But, adopting the jet pump row mode of adopting to carry out the coal bed gas well array when adopting, also need the control well bottom pressure steadily to descend, and then realize discharging bottom pressure, can not influence the target of reservoir permeability again because of the acute variation of bottom pressure.
Summary of the invention
The invention provides the system and method for the bottom pressure decrease speed of control coal bed gas well, to solve the steady problem that descends of bottom pressure that control jet pump row adopts the coal bed gas well under the mode.
The invention discloses a kind of system that controls the bottom pressure decrease speed of coal bed gas well, described system is used for the bottom pressure decrease speed that control jet pump row adopts the coal bed gas well under the mode,
Described system comprises: central controller, pressurizer, power fluid pressure table, automatic flow controller and bottom hole pressure bomb,
Described central controller is regulated described pressurizer to power fluid institute plus-pressure for the force value of the power fluid that measures according to described power fluid pressure table, makes the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value;
Described power fluid pressure table is for the force value of measuring power fluid;
Described pressurizer is used for pressurizeing to power fluid by the indication of described central controller;
Described central controller, the bottom pressure value that also is used for measuring according to described bottom hole pressure bomb is regulated the injection rate desired value, send the injection rate desired value to automatic flow controller, make underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds;
Described bottom hole pressure bomb is used for measuring well bottom pressure value;
Described automatic flow controller is used for the injection flow according to the injection rate desired value adjusting power fluid of the described central controller transmission that receives, and makes the injection flow of power fluid change to the direction near described injection rate desired value.
Wherein, described pressurizer specifically comprises: frequency converter and plunger displacement pump,
Described frequency converter is used for regulating operating frequency by the indication of described central controller, drags described plunger displacement pump by described operating frequency power fluid is pressurizeed.
Wherein, described central controller, concrete force value for the power fluid that described power fluid pressure table is measured is compared with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of described frequency converter, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of described frequency converter.
Wherein, described automatic flow controller specifically comprises: valve, flow meter, valve opening drive unit, flow control device and input interface;
Described input interface is used for receiving the injection rate desired value that described central controller sends;
Described flow control device, be used for according to described flowmeter survey to the flow value of power fluid regulate described valve opening drive unit to the aperture of described valve, make the flow value of power fluid to the direction variation that approaches described injection rate desired value;
Described flow meter is for the flow value of measuring power fluid;
Described valve opening drive unit is for the aperture of controlling described valve according to the indication of described flow control device;
Described valve is for the injection flow of control power fluid.
Wherein, described flow control device, concrete be used for described flowmeter survey to the flow value of power fluid compare with the injection rate desired value that receives, when the flow value of the power fluid that measures during greater than the injection rate desired value, reduce described valve opening drive unit to the aperture of described valve, when the flow value of the power fluid that measures during less than the injection rate desired value, increase described valve opening drive unit to the aperture of described valve.
Wherein, described central controller, the concrete bottom pressure value that is used for described bottom hole pressure bomb is measured is compared with default target bottom pressure value, when the bottom pressure value that measures during greater than target bottom pressure value, increase the injection rate desired value, when the bottom pressure value that measures during less than target bottom pressure value, reduce the injection rate desired value.
The invention also discloses a kind of method of controlling the bottom pressure decrease speed of coal bed gas well, described method is controlled the bottom pressure decrease speed that jet pump row adopts the coal bed gas well under the mode,
Described method comprises:
Measure the force value of power fluid by power fluid pressure table,
Come to regulate pressurizer to power fluid institute plus-pressure according to the force value of the power fluid that measures by central controller, make the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value,
Come to pressurize to power fluid by the indication of central controller by pressurizer; And
Come measuring well bottom pressure value by bottom hole pressure bomb,
Come to regulate the injection rate desired value according to the bottom pressure value that measures by central controller, send the injection rate desired value to automatic flow controller, make underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds,
The injection rate desired value of coming to send according to the central controller that receives by automatic flow controller is regulated the injection flow of power fluid, makes the injection flow of power fluid to the direction variation that approaches described injection rate desired value.
Wherein, describedly come specifically to comprise to the power fluid pressurization by the indication of central controller by pressurizer:
Frequency converter by described pressurizer regulates operating frequency by the indication of described central controller, and the plunger displacement pump that drags described pressurizer by described operating frequency pressurizes to power fluid.
It is wherein, described that force value adjusting pressurizer according to the power fluid that measures specifically comprises to power fluid institute plus-pressure by central controller:
By central controller the force value of the described power fluid that measures is compared with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of described frequency converter, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of described frequency converter.
Wherein, the described injection flow that regulates power fluid according to the injection rate desired value of the central controller transmission that receives by automatic flow controller specifically comprises:
Input interface by described automatic flow controller receives the injection rate desired value that described central controller sends;
Measure the flow value of power fluid by the flow meter of described automatic flow controller;
Flow control device by described automatic flow controller come according to described flowmeter survey to the flow value of power fluid regulate the valve opening drive unit of described automatic flow controller to the aperture of the valve of described automatic flow controller, make the flow value of power fluid to the direction variation that approaches described injection rate desired value;
Come to control according to the indication of described flow control device the aperture of described valve by described valve opening drive unit;
Control the injection flow of power fluid by described valve.
The invention has the beneficial effects as follows: adopt technical scheme in the present invention, measure the force value of power fluid by power fluid pressure table, come to regulate pressurizer to power fluid institute plus-pressure according to the force value of the power fluid that measures by central controller, make the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value, come to pressurize to power fluid by the indication of central controller by pressurizer; And come measuring well bottom pressure value by bottom hole pressure bomb, come to regulate the injection rate desired value according to the bottom pressure value that measures by central controller, send the injection rate desired value to automatic flow controller, make underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds, the injection rate desired value of coming to send according to the central controller that receives by automatic flow controller is regulated the injection flow of power fluid, makes the injection flow of power fluid to the direction variation that approaches described injection rate desired value.
The present invention adopts a plurality of Closed loop Control, comprise the force value of keeping power fluid closed-loop control, keep power fluid the injection flow closed-loop control and keep the closed-loop control that bottom pressure underspeeds.Therefore underspeed when departing from predetermined underspeeding when bottom pressure, can dynamically change the injection rate desired value of power fluid, and the injection flow of adjusting power fluid is near this injection rate desired value; When the injection flow of power fluid departs from definite injection rate desired value, can regulate the injection flow of power fluid automatically, make it near the injection rate desired value; And can regulate the pressure of power fluid automatically, when power fluid injects the flow change, can keep power fluid pressure and stablize unaffected.Like this, when changing the power fluid injection rate, keep the pressure of power fluid constant, and underspeeding of bottom pressure adjusted automatically, make underspeeding of bottom pressure tend to be steady.Therefore, the invention solves the steady problem that reduces of bottom pressure that control jet pump row adopts the coal bed gas well under the mode, obtained jet pump row and adopted under the mode, keep the beneficial effect of the bottom pressure smooth change of coal bed gas well.
Description of drawings
Fig. 1 is the structure chart of system of the bottom pressure decrease speed of control coal bed gas well of the present invention;
Fig. 2 is the structure chart of the system of the bottom pressure decrease speed of control coal bed gas well in one embodiment of the invention;
Fig. 3 is the structure chart of automatic flow controller in the system of bottom pressure decrease speed of control coal bed gas well in one embodiment of the invention;
Fig. 4 is the flow chart of the operation of the pressure of control power fluid in the method for bottom pressure decrease speed of control coal bed gas well of the present invention;
Fig. 5 is the flow chart of the operation of the injection flow of control power fluid in the method for bottom pressure decrease speed of control coal bed gas well of the present invention;
Fig. 6 is the flow chart of the method for the injection flow of control power fluid in one embodiment of the invention;
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, be the structure chart of the system of the bottom pressure decrease speed of control coal bed gas well provided by the invention.This system is used for the bottom pressure decrease speed that control jet pump row adopts the coal bed gas well under the mode.System comprises: central controller 300, pressurizer 100, power fluid pressure table 200, automatic flow controller 400 and bottom hole pressure bomb 500.Dash area is pipeline among the figure.
Power fluid pressure table 200 is for the force value of measuring power fluid.
Pressurizer 100 is used for pressurizeing to power fluid by the indication of described central controller 300.
Further, central controller 300 is compared the bottom pressure value that bottom hole pressure bomb 500 measures with default target bottom pressure value, when the bottom pressure value that measures during greater than target bottom pressure value, increase the injection rate desired value, when the bottom pressure value that measures during less than target bottom pressure value, reduce the injection rate desired value.When initial, the injection rate desired value is a default initial value, and the bottom pressure value that measures according to bottom hole pressure bomb 500 of central controller 300 is regulated this injection rate desired value afterwards.
Described target bottom pressure value is the desired value according to the default bottom pressure corresponding to each stage of underspeeding of predetermined bottom pressure value.For example, adopting back target bottom pressure value according to the default first day row that underspeed of predetermined bottom pressure value is A1, and it is A2 that second day row adopts back target bottom pressure value, and the A1 value guarantees thus that greater than the A2 value bottom pressure steadily descends.When the target bottom pressure value of the bottom pressure value of finding to measure in present stage greater than the present stage correspondence, represent that then underspeeding of bottom pressure underspeeds lowly than predetermined, therefore, increases the injection rate desired value; When the target bottom pressure value of the bottom pressure value of finding to measure in present stage less than the present stage correspondence, then represent underspeeding than predetermined underspeeding soon of bottom pressure, therefore, reduce the injection rate desired value.
Wherein, reduce or increase the injection rate desired value, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the bottom pressure value that measures and the target bottom pressure value of presetting, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
Bottom hole pressure bomb 500 is used for measuring well bottom pressure value.
Adopt a plurality of Closed loop Control in the present embodiment, comprise the force value of keeping power fluid closed-loop control, keep power fluid the injection flow closed-loop control and keep the closed-loop control that bottom pressure underspeeds.Therefore underspeed when departing from underspeeding of being scheduled to when bottom pressure, can dynamically change the injection rate desired value of power fluid, and the injection flow of regulating power fluid regulates thus and reduces underspeeding of pressure near this injection rate desired value, makes it approach predetermined underspeeding; When the injection flow of power fluid departs from definite injection rate desired value, can regulate the injection flow of power fluid automatically, make it near the injection rate desired value; And can regulate the pressure of power fluid automatically, when power fluid injects the flow change, can keep power fluid pressure and stablize unaffected.Like this, when changing the power fluid injection rate, keep the pressure of power fluid constant, and underspeeding of bottom pressure adjusted automatically, make underspeeding of bottom pressure tend to be steady.Therefore, the invention solves the steady problem that reduces of bottom pressure that control jet pump row adopts the coal bed gas well under the mode, obtained jet pump row and adopted under the mode, keep the beneficial effect of the bottom pressure smooth change of coal bed gas well.
Referring to Fig. 2, be the structure chart of the system of the bottom pressure decrease speed of control coal bed gas well in one embodiment of the invention.Pressurizer 100 specifically comprises frequency converter 110 and plunger displacement pump 120.Power fluid is stored in the storage tank.
Frequency converter 110, the indication adjusting operating frequency that is used for pressing central controller 300 drags 120 pairs of power fluids of plunger displacement pump by this operating frequency and pressurizes.
Further, central controller 300 is compared the force value of the power fluid that power fluid pressure table 200 measures with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of frequency converter 110, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of frequency converter 110.
Wherein, reduce or increase the operating frequency of frequency converter 110, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the force value of power fluid and default target power hydraulic coupling value, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
The variation of the operating frequency of frequency converter directly changes the power fluid pressure that plunger displacement pump produces, thereby can realize keeping the closed-loop control of the force value of power fluid.
Referring to Fig. 3, be the structure chart of automatic flow controller in the system of the bottom pressure decrease speed of control coal bed gas well in one embodiment of the invention.Automatic flow controller 400 specifically comprises: valve 410, flow meter 420, valve opening drive unit 430, flow control device 440 and input interface 450.
Flow control device 440 is used for the aperture of 430 pairs of valves 410 of flow value controlling opening of valve drive unit of the power fluid that measures according to flow meter 420, makes the flow value of power fluid change to the direction near the injection rate desired value.
Further, flow control device 440 is compared the flow value of the power fluid that flow meter 420 measures with the injection rate desired value that receives, when the flow value of the power fluid that measures during greater than the injection rate desired value, reduce the aperture of 430 pairs of valves 410 of valve opening drive unit, when the flow value of the power fluid that measures during less than the injection rate desired value, increase the aperture of 430 pairs of valves 410 of valve opening drive unit.
Wherein, reduce or increase the aperture of 430 pairs of valves 410 of valve opening drive unit, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the flow value of the power fluid that measures and the injection rate desired value that receives, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
Valve opening drive unit 430 is used for the aperture according to the indication by-pass valve control 410 of flow control device 440.
In the present embodiment, by flow meter the injection flow of power fluid is monitored, according to the injection rate desired value controlling opening of valve drive unit of the flow value of the power fluid that measures and the reception aperture to valve, and then the injection flow of control power fluid.On the one hand, the injection rate desired value of regulating according to the foundation bottom pressure is regulated the injection flow of power fluid, change row by the injection flow of regulating power fluid and adopt intensity, because row adopts the incidence relation between intensity and bottom pressure decrease speed, reach the effect of control well bottom pressure decrease speed.On the other hand, according to the flow value controlling opening of valve drive unit of the power fluid that the measures aperture to valve, make the flow value of power fluid near the injection rate desired value, reach the closed-loop control of the injection flow of keeping power fluid.
The invention also discloses a kind of method of controlling the bottom pressure decrease speed of coal bed gas well.This method is controlled the bottom pressure decrease speed that jet pump row adopts the coal bed gas well under the mode.
Referring to Fig. 4, for the flow chart of the operation of the pressure of control power fluid in the method for the bottom pressure decrease speed of control coal bed gas well of the present invention, comprising following steps.
Step S410 measures the force value of power fluid by power fluid pressure table.
Step S420 comes to regulate pressurizer to power fluid institute plus-pressure according to the force value of the power fluid that measures by central controller, makes the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value,
Step S430 comes to pressurize to power fluid by the indication of central controller by pressurizer.
Referring to Fig. 5, for the flow chart of the operation of the injection flow of control power fluid in the method for the bottom pressure decrease speed of control coal bed gas well of the present invention, comprising following steps.
Step S510 comes measuring well bottom pressure value by bottom hole pressure bomb.
Step S520 comes to regulate the injection rate desired value according to the bottom pressure value that measures by central controller, sends the injection rate desired value to automatic flow controller, makes underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds.
Further, step S520 specifically comprises: by central controller the bottom pressure value that measures is compared with default target bottom pressure value, when the bottom pressure value that measures during greater than target bottom pressure value, increase the injection rate desired value, when the bottom pressure value that measures during less than target bottom pressure value, reduce the injection rate desired value.When initial, the injection rate desired value is a default initial value, comes to regulate this injection rate desired value according to the bottom pressure value that bottom hole pressure bomb measures by central controller afterwards.
Described target bottom pressure value is the desired value according to the default bottom pressure corresponding to each stage of underspeeding of predetermined bottom pressure value.For example, adopting back target bottom pressure value according to the default first day row that underspeed of predetermined bottom pressure value is A1, and it is A2 that second day row adopts back target bottom pressure value, and the A1 value guarantees thus that greater than the A2 value bottom pressure steadily descends.When the target bottom pressure value of the bottom pressure value of finding to measure in present stage greater than the present stage correspondence, represent that then underspeeding of bottom pressure underspeeds lowly than predetermined, therefore, increases the injection rate desired value; When the target bottom pressure value of the bottom pressure value of finding to measure in present stage less than the present stage correspondence, then represent underspeeding than predetermined underspeeding soon of bottom pressure, therefore, reduce the injection rate desired value.
Wherein, reduce or increase the injection rate desired value, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the bottom pressure value that measures and the target bottom pressure value of presetting, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
Step S530, the injection rate desired value of coming to send according to the central controller that receives by automatic flow controller is regulated the injection flow of power fluid, makes the injection flow of power fluid change to the direction that approaches the injection rate desired value that receives.
Adopt a plurality of Closed loop Control in the present embodiment, comprise the force value of keeping power fluid closed-loop control, keep power fluid the injection flow closed-loop control and keep the closed-loop control that bottom pressure underspeeds.Therefore underspeed when departing from predetermined underspeeding when bottom pressure, can dynamically change the injection rate desired value of power fluid, and the injection flow of adjusting power fluid is near this injection rate desired value; When the injection flow of power fluid departs from definite injection rate desired value, can regulate the injection flow of power fluid automatically, make it near the injection rate desired value; And can regulate the pressure of power fluid automatically, when power fluid injects the flow change, can keep power fluid pressure and stablize unaffected.Like this, when changing the power fluid injection rate, keep the pressure of power fluid constant, and underspeeding of bottom pressure adjusted automatically, make underspeeding of bottom pressure tend to be steady.Therefore, the invention solves the steady problem that reduces of bottom pressure that control jet pump row adopts the coal bed gas well under the mode, obtained jet pump row and adopted under the mode, keep the beneficial effect of the bottom pressure smooth change of coal bed gas well.
In one embodiment of this invention, described step S430 specifically comprises: the frequency converter by pressurizer regulates operating frequency by the indication of central controller, and the plunger displacement pump that drags described pressurizer by described operating frequency pressurizes to power fluid.
Further, the force value that step S420 specifically comprises the power fluid that will measure is compared with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of frequency converter, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of frequency converter.
Wherein, reduce or increase the operating frequency of frequency converter, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the force value of power fluid and default target power hydraulic coupling value, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
The variation of the operating frequency of frequency converter directly changes the power fluid pressure that plunger displacement pump produces, thereby can realize keeping the closed-loop control of the force value of power fluid.
Referring to Fig. 6, be the flow chart of the method for the injection flow of control power fluid in one embodiment of the invention.Described step S530 specifically comprises the steps.
Step S531, the input interface by automatic flow controller receives the injection rate desired value that described central controller sends.
Step S532 measures the flow value of power fluid by the flow meter of automatic flow controller.
Step S533, flow control device by automatic flow controller regulates the valve opening drive unit of automatic flow controller to the aperture of the valve of automatic flow controller according to the flow value of the power fluid that measures, and makes the flow value of power fluid change to the direction that approaches the injection rate desired value that receives.
Further, by flow control device the flow value of the power fluid that measures is compared with the injection rate desired value that receives, when the flow value of the power fluid that measures during greater than the injection rate desired value, reduce the valve opening drive unit to the aperture of valve, when the flow value of the power fluid that measures during less than the injection rate desired value, increase the valve opening drive unit to the aperture of valve.
Wherein, reduce or increase the valve opening drive unit to the aperture of valve, can reduce or increase by the fixed step size value that arranges, perhaps also can be according to difference size between the flow value of the power fluid that measures and the injection rate desired value that receives, draw the amount of this minimizing or increase, difference is more big, and the amount that then reduces or increase is more big.At this, be not particularly limited for the mode of concrete minimizing or increase.
Step S534 comes aperture according to the indication by-pass valve control of flow control device by the valve opening drive unit.
Step S535 controls the injection flow of power fluid by valve.
In the present embodiment, by flow meter the injection flow of power fluid is monitored, according to the injection rate desired value controlling opening of valve drive unit of the flow value of the power fluid that measures and the reception aperture to valve, and then the injection flow of control power fluid.On the one hand, the injection rate desired value of regulating according to the foundation bottom pressure is regulated the injection flow of power fluid, change row by the injection flow of regulating power fluid and adopt intensity, because row adopts the incidence relation between underspeeding of intensity and bottom pressure, reach the effect of control well bottom pressure decrease speed.On the other hand, according to the flow value controlling opening of valve drive unit of the power fluid that the measures aperture to valve, make the flow value of power fluid near the injection rate desired value, reach the closed-loop control of the injection flow of keeping power fluid.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. a system that controls the bottom pressure decrease speed of coal bed gas well is characterized in that, described system is used for the bottom pressure decrease speed that control jet pump row adopts the coal bed gas well under the mode,
Described system comprises: central controller, pressurizer, power fluid pressure table, automatic flow controller and bottom hole pressure bomb,
Described central controller is regulated described pressurizer to power fluid institute plus-pressure for the force value of the power fluid that measures according to described power fluid pressure table, makes the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value;
Described power fluid pressure table is for the force value of measuring power fluid;
Described pressurizer is used for pressurizeing to power fluid by the indication of described central controller;
Described central controller, the bottom pressure value that also is used for measuring according to described bottom hole pressure bomb is regulated the injection rate desired value, send the injection rate desired value to automatic flow controller, make underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds;
Described bottom hole pressure bomb is used for measuring well bottom pressure value;
Described automatic flow controller is used for the injection flow according to the injection rate desired value adjusting power fluid of the described central controller transmission that receives, and makes the injection flow of power fluid change to the direction near described injection rate desired value.
2. system according to claim 1 is characterized in that,
Described pressurizer specifically comprises: frequency converter and plunger displacement pump,
Described frequency converter is used for regulating operating frequency by the indication of described central controller, drags described plunger displacement pump by described operating frequency power fluid is pressurizeed.
3. system according to claim 2 is characterized in that,
Described central controller, concrete force value for the power fluid that described power fluid pressure table is measured is compared with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of described frequency converter, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of described frequency converter.
4. system according to claim 1 is characterized in that,
Described automatic flow controller specifically comprises: valve, flow meter, valve opening drive unit, flow control device and input interface;
Described input interface is used for receiving the injection rate desired value that described central controller sends;
Described flow control device, be used for according to described flowmeter survey to the flow value of power fluid regulate described valve opening drive unit to the aperture of described valve, make the flow value of power fluid to the direction variation that approaches described injection rate desired value;
Described flow meter is for the flow value of measuring power fluid;
Described valve opening drive unit is for the aperture of controlling described valve according to the indication of described flow control device;
Described valve is for the injection flow of control power fluid.
5. system according to claim 4 is characterized in that,
Described flow control device, concrete be used for described flowmeter survey to the flow value of power fluid compare with the injection rate desired value that receives, when the flow value of the power fluid that measures during greater than the injection rate desired value, reduce described valve opening drive unit to the aperture of described valve, when the flow value of the power fluid that measures during less than the injection rate desired value, increase described valve opening drive unit to the aperture of described valve.
6. according to each described system of claim 1 to 5, it is characterized in that,
Described central controller, the concrete bottom pressure value that is used for described bottom hole pressure bomb is measured is compared with default target bottom pressure value, when the bottom pressure value that measures during greater than target bottom pressure value, increase the injection rate desired value, when the bottom pressure value that measures during less than target bottom pressure value, reduce the injection rate desired value.
7. a method of controlling the bottom pressure decrease speed of coal bed gas well is characterized in that, described method is controlled the bottom pressure decrease speed that jet pump row adopts the coal bed gas well under the mode,
Described method comprises:
Measure the force value of power fluid by power fluid pressure table,
Come to regulate pressurizer to power fluid institute plus-pressure according to the force value of the power fluid that measures by central controller, make the force value of power fluid change towards the direction that approaches default target power hydraulic coupling value,
Come to pressurize to power fluid by the indication of central controller by pressurizer; And
Come measuring well bottom pressure value by bottom hole pressure bomb,
Come to regulate the injection rate desired value according to the bottom pressure value that measures by central controller, send the injection rate desired value to automatic flow controller, make underspeeding of bottom pressure change towards approaching the predetermined direction that underspeeds,
The injection rate desired value of coming to send according to the central controller that receives by automatic flow controller is regulated the injection flow of power fluid, makes the injection flow of power fluid to the direction variation that approaches described injection rate desired value.
8. method according to claim 7 is characterized in that,
Describedly come specifically to comprise to the power fluid pressurization by the indication of central controller by pressurizer:
Frequency converter by described pressurizer regulates operating frequency by the indication of described central controller, and the plunger displacement pump that drags described pressurizer by described operating frequency pressurizes to power fluid.
9. method according to claim 8 is characterized in that,
It is described that force value adjusting pressurizer according to the power fluid that measures specifically comprises to power fluid institute plus-pressure by central controller:
By central controller the force value of the described power fluid that measures is compared with default target power hydraulic coupling value, when the force value of the power fluid that measures during greater than target power hydraulic coupling value, reduce the operating frequency of described frequency converter, when the force value of the power fluid that measures during less than target power hydraulic coupling value, increase the operating frequency of described frequency converter.
10. method according to claim 7 is characterized in that,
The described injection flow that regulates power fluid according to the injection rate desired value of the central controller transmission that receives by automatic flow controller specifically comprises:
Input interface by described automatic flow controller receives the injection rate desired value that described central controller sends;
Measure the flow value of power fluid by the flow meter of described automatic flow controller;
Flow control device by described automatic flow controller come according to described flowmeter survey to the flow value of power fluid regulate the valve opening drive unit of described automatic flow controller to the aperture of the valve of described automatic flow controller, make the flow value of power fluid to the direction variation that approaches described injection rate desired value;
Come to control according to the indication of described flow control device the aperture of described valve by described valve opening drive unit;
Control the injection flow of power fluid by described valve.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105756624A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed methane drainage and production control method and device |
| CN109209303A (en) * | 2017-06-29 | 2019-01-15 | 中国石油天然气股份有限公司 | A kind of mining control method of coal bed gas well |
| CN109751016A (en) * | 2018-12-03 | 2019-05-14 | 中国石油天然气股份有限公司 | Mining control method, device and mining system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6484816B1 (en) * | 2001-01-26 | 2002-11-26 | Martin-Decker Totco, Inc. | Method and system for controlling well bore pressure |
| CN1611742A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Under balance drilling bottom pressure automatic control system and method |
| US20070227774A1 (en) * | 2006-03-28 | 2007-10-04 | Reitsma Donald G | Method for Controlling Fluid Pressure in a Borehole Using a Dynamic Annular Pressure Control System |
| US7395878B2 (en) * | 2003-08-19 | 2008-07-08 | At-Balance Americas, Llc | Drilling system and method |
| CN102278100A (en) * | 2011-06-01 | 2011-12-14 | 中国石油天然气股份有限公司 | Constant flow control device and method for high-pressure water injection well |
| CN102939432A (en) * | 2010-06-15 | 2013-02-20 | 哈利伯顿能源服务公司 | Annulus pressure setpoint correction using real time pressure while drilling measurements |
| CN202755927U (en) * | 2012-06-29 | 2013-02-27 | 中国石油天然气集团公司 | Well drilling device using flow monitoring to control bottom hole pressure |
| CN202788695U (en) * | 2012-08-03 | 2013-03-13 | 中国石油化工股份有限公司 | Pressure and flow management system of shaft |
-
2013
- 2013-04-12 CN CN201310127853.7A patent/CN103206180B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6484816B1 (en) * | 2001-01-26 | 2002-11-26 | Martin-Decker Totco, Inc. | Method and system for controlling well bore pressure |
| US7395878B2 (en) * | 2003-08-19 | 2008-07-08 | At-Balance Americas, Llc | Drilling system and method |
| CN1611742A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Under balance drilling bottom pressure automatic control system and method |
| US20070227774A1 (en) * | 2006-03-28 | 2007-10-04 | Reitsma Donald G | Method for Controlling Fluid Pressure in a Borehole Using a Dynamic Annular Pressure Control System |
| CN102939432A (en) * | 2010-06-15 | 2013-02-20 | 哈利伯顿能源服务公司 | Annulus pressure setpoint correction using real time pressure while drilling measurements |
| CN102278100A (en) * | 2011-06-01 | 2011-12-14 | 中国石油天然气股份有限公司 | Constant flow control device and method for high-pressure water injection well |
| CN202755927U (en) * | 2012-06-29 | 2013-02-27 | 中国石油天然气集团公司 | Well drilling device using flow monitoring to control bottom hole pressure |
| CN202788695U (en) * | 2012-08-03 | 2013-03-13 | 中国石油化工股份有限公司 | Pressure and flow management system of shaft |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105756624A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed methane drainage and production control method and device |
| CN109209303A (en) * | 2017-06-29 | 2019-01-15 | 中国石油天然气股份有限公司 | A kind of mining control method of coal bed gas well |
| CN109751016A (en) * | 2018-12-03 | 2019-05-14 | 中国石油天然气股份有限公司 | Mining control method, device and mining system |
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|---|---|
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