CN104141490A - Method and device for judging single-well water invasion situation of water-carrying gas reservoir and controlling gas well production - Google Patents
Method and device for judging single-well water invasion situation of water-carrying gas reservoir and controlling gas well production Download PDFInfo
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- CN104141490A CN104141490A CN201410342357.8A CN201410342357A CN104141490A CN 104141490 A CN104141490 A CN 104141490A CN 201410342357 A CN201410342357 A CN 201410342357A CN 104141490 A CN104141490 A CN 104141490A
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Abstract
The invention discloses a method and a device for judging a single-well water invasion situation of a water-carrying gas reservoir and controlling gas well production. The method for judging the single-well water invasion situation of the water-carrying gas reservoir comprises the steps of taking Gp(Ppi-Pp)/(Ppi-Ppwf) as x coordinates, taking q/delta Pp as y coordinates, and drawing a first diagnostic curve; taking Gp as the x coordinates, taking Pwf/Z as the y coordinates, and drawing a second diagnostic curve; taking tca as the x coordinates, taking q/delta Pp as the y coordinates, and drawing a third diagnostic curve; respectively carrying out gas well water invasion judgment on the first diagnostic curve, the second diagnostic curve and the third diagnostic curve; giving a gas well water invasion conclusion by integrating judging results, wherein Gp is the cumulative gas production in current time, Ppi is a pseudopressure form of initial pressure of a gas well, Pp is the average pseudopressure of an oil reservoir in the current time, Ppwf is a pseudopressure form of BHFP (Bottom Hole Flowing Pressure) of the gas well, q is the daily gas production of the gas well, delta Pp is equal to Ppi-Ppwf, Pwf is the BHFP of the gas well, Z is a gas bias factor, and tca is a pseudotime function. According to the method and the device, disclosed by the invention, the reliability of judging the single-well water invasion situation of the water-carrying gas reservoir can be increased, and the production of the gas well can be reasonably controlled.
Description
Technical field
The present invention relates to gas reservoir development technical field, related in particular to the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation and gas well production yield control method and device.
Background technology
Concerning the gas reservoir development of water energy at the bottom of having stronger limit, the problem of worrying is most exactly gas well water breakthrough.Once gas well water breakthrough, not only causes a lot of troubles to engineering aspects such as floor treatment, key is greatly to reduce gas well capacity simultaneously, causes gas well to yield poorly and closing well too early, thereby greatly affects gas deposit recovery efficiency and final development effectiveness.Therefore, accurately gas well water breakthrough is predicted in advance, and rationally controlled gas well producing pressure differential, raising anhydrous gas production phase of gas well, make gas reservoir integral body reach balanced exploitation, can greatly improve the whole development effect of gas reservoir.
Both at home and abroad gas well water breakthrough time Forecasting Methodology is conducted in-depth research, conventionally adopt the seepage flow equation inference prediction Gas Reservoirs gas well water breakthrough time end, provide the concrete water breakthrough time that water-cone breakthrough Time Calculation formula is predicted gas well.But due to actual gas reservoir non-homogeneity is strong and gas well manufacturing process in system constantly adjust, cause adopting these methods to carry out the prediction of gas well water breakthrough or water enchroachment (invasion), larger with actual conditions gap, and the whole bag of tricks evaluation result is quite different, suitable method is carried out water enchroachment (invasion) research to make the more difficult selection of researcher.Also there are the methods such as the material balance method of employing and gas reservoir water influx indicative curve to predict gas well water enchroachment (invasion), but the method application is also relatively limited to, because the method need gas well to test more static pressure data point and have certain recovery percent of reserves after just can reach good prediction, but actual gas well static pressure test point is less and during a lot of well water breakthrough recovery percent of reserves still lower.Adopt in addition well testing double logarithmic curve to predict gas well water enchroachment (invasion), the method opposite side water water enchroachment (invasion) situation can realize better prediction, but more difficult to the prediction of end Gas Reservoirs, and gas well well test analysis data are less, is difficult to every implication well to carry out water enchroachment (invasion) prediction accurately.Therefore, until gas well water enchroachment (invasion) prediction is at present still a large technical barrier urgently to be resolved hurrily.
Summary of the invention
The embodiment of the present invention provides a kind of Gas Reservoirs individual well water enchroachment (invasion) situation determination methods that has, and in order to improve the reliability that has the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, the method comprises:
With
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve;
With G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve;
With t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve;
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
When the judged result of the first diagnosis curve is consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion;
Wherein, G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas; t
cafor pseudotime function.
In an embodiment, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, also comprise:
Determine p
i;
By p
ibe converted to p
pi;
Determine p
wtf;
According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf;
Wherein, p
ifor gas well initial pressure, p
wtffor gas well mouth pressure.
In an embodiment, before drawing the 3rd diagnosis curve, also comprise by following formula and determine t
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
In an embodiment, before respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve being carried out to the judgement of gas well water enchroachment (invasion), also comprise: respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out curve fitting;
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion), comprising: respectively the first diagnosis curve after curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion).
In an embodiment, while providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, also further combined with existing water enchroachment (invasion) determination methods, carry out assistant analysis.
In an embodiment, described existing water enchroachment (invasion) determination methods comprises well-logging method and/or water cone production rate limit method.
The embodiment of the present invention also provides a kind of gas well production yield control method, and in order to reasonable control gas well output, the method comprises:
According to above-mentioned, have a Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
When gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, reduce gas well daily output tolerance;
When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
The embodiment of the present invention also provides a kind of Gas Reservoirs individual well water enchroachment (invasion) situation judgment means that has, and in order to improve the reliability that has the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, this device comprises:
The first Drawing of Curve module, for
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve;
The second Drawing of Curve module, for G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve;
The 3rd Drawing of Curve module, for t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve;
The first curve judge module, for the first diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The second curve judge module, for second opinion curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The 3rd curve judge module, for the 3rd diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
Judgement conclusion output module, consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve for the judged result when the first diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion;
Wherein, G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas; t
cafor pseudotime function.
In an embodiment, this device also comprises:
Pressure determination module, for determining p
i; By p
ibe converted to p
pi; Determine p
wtf; According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf;
Wherein, p
ifor gas well initial pressure, p
wtffor gas well mouth pressure.
In an embodiment, this device also comprises:
Time determination module, for determining t by following formula
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
In an embodiment, this device also comprises:
The first curve fitting module, for carrying out curve fitting to the first diagnosis curve;
The second curve fitting module, for carrying out curve fitting to second opinion curve;
The 3rd curve fitting module, for carrying out curve fitting to the 3rd diagnosis curve;
The first curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the first diagnosis curve to after curve;
The second curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the second opinion curve to after curve;
The 3rd curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the 3rd diagnosis curve to after curve.
In an embodiment, judgement conclusion output module is further used for, when the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion, in conjunction with existing water enchroachment (invasion) determination methods, carrying out assistant analysis.
In an embodiment, described existing water enchroachment (invasion) determination methods comprises well-logging method and/or water cone production rate limit method.
The embodiment of the present invention also provides a kind of gas well output control device, and in order to reasonable control gas well output, this device comprises:
Prediction module, for utilizing the above-mentioned Gas Reservoirs individual well water enchroachment (invasion) situation judgment means that has, prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
Gas well output control module, for entering water enchroachment (invasion) initial stage or water enchroachment (invasion) when gas well during the middle and later periods, reduces gas well daily output tolerance; When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
In the embodiment of the present invention, for the judgement that has Gas Reservoirs individual well water enchroachment (invasion) situation, the daily output tolerance, pressure data that has adopted gas well is as basic data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thereby reaches the object of accurate judgement gas well water enchroachment (invasion); Owing to adopting dynamic output, pressure data in whole gas well manufacturing process to judge water enchroachment (invasion), thereby taken into full account the impact that gas reservoir non-homogeneity causes---the impact gas well output, pressure being changed, and the impact of gas well production system change etc., therefore more tally with the actual situation.
In addition, according to there being the judged result of Gas Reservoirs individual well water enchroachment (invasion) situation to carry out the control of gas well output, can rationally controlling gas well producing pressure differential, improve the anhydrous gas production phase of gas well, make gas reservoir integral body reach balanced exploitation, can greatly improve the whole development effect of gas reservoir.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.In the accompanying drawings:
Fig. 1 is the process chart that has Gas Reservoirs individual well water enchroachment (invasion) situation determination methods in the embodiment of the present invention;
Fig. 2 is the schematic diagram of the first diagnosis curve in the embodiment of the present invention;
Fig. 3 is the schematic diagram of second opinion curve in the embodiment of the present invention;
Fig. 4 is the schematic diagram of the 3rd diagnosis curve in the embodiment of the present invention;
Fig. 5 is actual gas well the first diagnosis curve water enchroachment (invasion) stage division schematic diagram in the embodiment of the present invention;
Fig. 6 is actual gas well second opinion curve water enchroachment (invasion) stage division schematic diagram in the embodiment of the present invention;
Fig. 7 is actual gas well the 3rd diagnosis curve water enchroachment (invasion) stage division schematic diagram in the embodiment of the present invention;
Fig. 8 is the process chart of gas well production yield control method in the embodiment of the present invention;
Fig. 9 is the schematic diagram that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention;
Figure 10, Figure 11, Figure 12 are the instantiation figure that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention;
Figure 13 is the schematic diagram of gas well output control device in the embodiment of the present invention.
The specific embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, schematic description and description of the present invention is used for explaining the present invention, but not as a limitation of the invention.
In order to improve the reliability that has the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, the embodiment of the present invention provides a kind of Gas Reservoirs individual well water enchroachment (invasion) situation determination methods that has.Fig. 1 is the process chart that has Gas Reservoirs individual well water enchroachment (invasion) situation determination methods in the embodiment of the present invention, as shown in Figure 1, has Gas Reservoirs individual well water enchroachment (invasion) situation determination methods to comprise in the embodiment of the present invention:
Step 101, drafting the first diagnosis curve; Specifically with
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve; G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf;
Step 102, drafting second opinion curve, specifically with G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas;
Step 103, drafting the 3rd diagnosis curve, specifically with t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve; t
cafor pseudotime function; Step 101,102 and 103 execution sequencing can be changed;
Step 104, respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion); Concrete, when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
Step 105, when the judged result of the first diagnosis curve is consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion.
Flow process can be learnt as shown in Figure 1, in the embodiment of the present invention, for the judgement that has Gas Reservoirs individual well water enchroachment (invasion) situation, the daily output tolerance, pressure data that has adopted gas well is as basic data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thereby reaches the object of accurate judgement gas well water enchroachment (invasion); Owing to adopting dynamic output, pressure data in whole gas well manufacturing process to judge water enchroachment (invasion), thereby taken into full account the impact that gas reservoir non-homogeneity causes---the impact gas well output, pressure being changed, and the impact of gas well production system change etc., therefore more tally with the actual situation.
During concrete enforcement, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, can also comprise: determine p
i, p
ifor gas well initial pressure; By p
ibe converted to p
pi; Determine p
wtf, p
wtffor gas well mouth pressure; According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf.
During concrete enforcement, before drawing the 3rd diagnosis curve, can also comprise by following formula and determine t
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
In embodiment, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, the original formation pressure before can first measuring gas well and not producing is gas well initial pressure p
i, daily output tolerance q and the well head pressure p of mensuration gas well every day
wtf; Can also measure the gas PVT data of the representative gas well in gas field, comprise critical-temperature, critical pressure, gas relative density, gas component composition, deviation factor for gas (Z changes with pressure), the compression coefficient (C of gas
g, with pressure, change).By wellbore tubular, flow principle by p
wtfconversion is flowing bottomhole pressure (FBHP) p
wf, then by p
iand p
wfconversion is gas pseudopressure form p
piand p
pwf.
During concrete enforcement, before respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve being carried out to the judgement of gas well water enchroachment (invasion), can also comprise: respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out curve fitting.Follow-up when carrying out the judgement of gas well water enchroachment (invasion), can to the first diagnosis curve after curve, second opinion curve and the 3rd diagnosis curve, carry out the judgement of gas well water enchroachment (invasion) respectively.
For example,, with gas well daily output tolerance q and Δ p
p=p
pi-p
pwfratio as ordinate, with
for abscissa mapping (drawing the first diagnosis curve), all data points in figure are carried out to curve regression fit, when being obviously upwards offset, regression fit curve illustrates that now gas well may enter the water enchroachment (invasion) initial stage; When regression fit curve is offset again, illustrate that now gas well may enter the water enchroachment (invasion) middle and later periods downwards;
Take gas well cumulative production as abscissa again, the ratio of gas well flowing bottomhole pressure (FBHP) and deviation factor for gas of take is ordinate mapping (drawing second opinion curve), all points are carried out to curve regression fit, and when regression fit curve is upwards offset, explanation now may enter the water enchroachment (invasion) initial stage; When regression fit curve is offset downwards again, illustrates now and may enter the water enchroachment (invasion) middle and later periods;
Again with gas well daily output tolerance q and Δ p
p=p
pi-p
pwfratio as ordinate, with zero dimension material balance time t
cafor abscissa mapping (drawing the 3rd diagnosis curve), all eyeballs and Blasingame typical curve plots are contrasted to matching, find best matched curve, then carry out analogy with the good Blasingame typical curve of matching, when measured curve is upwards offset, explanation now may enter the water enchroachment (invasion) initial stage; When curve is offset downwards again, illustrates now and may enter the water enchroachment (invasion) middle and later periods;
The first situation in above-mentioned three kinds of Forecasting Methodologies occurs that when identical predicting the outcome appears in a kind of in other two kinds of situations or two kinds simultaneously, now this gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and later periods.
Describe the first diagnosis curve, second opinion curve and the 3rd diagnosis curve below in detail and carry out the concrete enforcement of gas well water enchroachment (invasion) judgement.
(1) first diagnosis curve
The first diagnosis curve ordinate is pseudopressure Regularization output q/ Δ p
p, it is defined as follows:
Q is individual well current production rate, m
3/ d; P is pressure, MPa; μ is gas viscosity, mpas; Z is deviation factor for gas, zero dimension.Ordinate can be regarded as gas well current production rate and intends at present the ratio of producing pressure differential, can be similar to the production capacity index of thinking that gas well is current.And the abscissa of this diagnosis curve is
abscissa can be similar to regards the tired ratio of intending at present producing pressure differential with well that produces of gas well as.For sealing constant volume gas reservoir, this diagnosis curve should be a straight line, and the intersection point of straight line and abscissa corresponds to the single well-controlled dynamic holdup of gas well.But for there being Gas Reservoirs, this diagnosis curve shows as syllogic, correspond to respectively not water enchroachment (invasion) phase, water enchroachment (invasion) initial stage, water enchroachment (invasion) middle and later periods three phases, as shown in Figure 2.Separately in this article, subscript i represents that gas well do not produce before measurement value, i.e. original value, as p
ifor gas well initial pressure, G
ifor gas well cumulative gas production initial value; Subscript r represents gas reservoir value, as p
rfor gas reservoir pressure; Subscript f represents slamp value, as p
wffor gas well flowing pressure.
Sealing gas reservoir diagnosis curve be straight line someone proves, the dynamic holdup that the intersection point of straight line and transverse axis is gas reservoir.Researcher hankers after being undertaken by the method the dynamic holdup evaluation of gas reservoir/well always, has but ignored the application of the method in production dynamic analysis.This diagnosis curve due to take full advantage of that the output of every day of well and stream are pressed production that data, the variation of tracing pattern have fully reflected well dynamically and well around reservoir change.For water drive gas reservoir, the water enchroachment (invasion) phase is not that well is not received supplementing of water water energy at the bottom of any limit, and the well area that loses heart not yet feeds through to water body, and diagnosis curve is initial stage straightway.When disappointing area feeds through to after water body, gas reservoir is subject to after supplementing of water energy, and gas well exploitation enters the water enchroachment (invasion) initial stage, and the gas well deliverability index of axis of ordinates is uninfluenced, and abscissa does not become, but because being subject to the supplementary rear gas reservoir pressure decline of water energy slows down, p
ithan p corresponding to sealing gas reservoir under same case
ivalue is large, causes curve to be offset to upper right side.Concerning the water enchroachment (invasion) middle and later periods, limit Di Shui has broken through to around well, concerning the initial stage of middle and later periods, although gas well may also not produce water, but due to gas well around or certain direction by water, surrounded, gas flow is obstructed, it is large that filtrational resistance obviously becomes, cause producing pressure differential under identical gas production condition obviously to become large, gas well index number of producing gas diminishes; And after the later stage of water enchroachment (invasion) middle and later periods is gas well water breakthrough, gas well capacity index can reduce rapidly especially, the rapid reduction of index number of producing gas, on the first diagnosis curve, showing as curve is obviously that X value and Y value all obviously diminish toward lower left skew.In addition, in order to draw this curve, the production dynamic data that needs fluid properties data, well log interpretation parameter and the gas well of gas well is that output is pressed data with stream, and the on-the-spot every mouthful of well of these data all has relevant data.Therefore every mouthful of well all can be drawn this water enchroachment (invasion) diagnosis curve.By the practical application of this diagnosis curve, finding that curve is very responsive to the dynamic variation of the actual water enchroachment (invasion) of gas well, to water enchroachment (invasion) recognition accuracy, can reach more than 80%, is the main curve of gas well water enchroachment (invasion) situation judgement.
(2) second opinion curve
Second opinion curve ordinate is the ratio of gas well stream pressure and deviation factor for gas, and abscissa is gas well accumulation produced quantity.Be characterized in that this curve is a straightway for sealing gas reservoir, adopt the straightway of pressure decline method just in time parallel with this gas reservoir, therefore, after knowing the original reservoir strata pressure of gas well, just can utilize the control dynamic holdup of second opinion curve prediction gas well.And pressure decline method curve is used as a kind of water enchroachment (invasion) identification curve of gas reservoir always, sealing gas reservoir pressure decline method curve is straight line, as shown in Fig. 3 dotted line.A material balance pressure decline method curve for employing static pressure data in Fig. 3, one is that this method adopts the curve of analyzing water enchroachment (invasion) for adopting the second opinion curve of flowing pressure.
Concerning having Gas Reservoirs, after the later stage has water energy to supplement, pressure decline method curve started toward upper right side skew, corresponding water enchroachment (invasion) stage.But pressure decline method only can identify two stages, and because actual gas well is tested static pressure data seldom, recognition function is restricted again greatly.But second opinion curve is owing to adopting daily output tolerance and stream to press data (stream is pressed and can be adopted oil pressure or casing pressure data to obtain by the conversion of wellbore tubular stream method), thereby this curve actual data point is very many.And second opinion curve shows three sections of property to Water Invasion Characteristics, difference correspondence is water enchroachment (invasion) phase, water enchroachment (invasion) initial stage, water enchroachment (invasion) middle and later periods three phases not.Concerning the water enchroachment (invasion) initial stage, consistent with pressure decline method feature, reason is consistent, and gas well has been subject to the certain energy supplement of extraneous water body but production capacity is not affected.Concerning the water enchroachment (invasion) middle and later periods, with the first diagnosis class of a curve seemingly, after Bian Dishui is advanced to shaft bottom, index number of producing gas obviously reduces, producing pressure differential increases, flowing bottomhole pressure (FBHP) reduces rapidly, curve is skew downwards obviously.But offset downward amplitude and can as the first diagnosis curve, not have the trend that X value diminishes, because second opinion curve X-axis is cumulative gas production, this value increases along with producing gradually, and just after gas well water breakthrough, amplification obviously slows down.The water enchroachment (invasion) recognition function of second opinion curve does not have the first diagnosis curve responsive, and especially stage water enchroachment (invasion) middle and later periods is responsive not.
(3) the 3rd diagnosis curves
The 3rd diagnosis curve negotiating has been introduced ordinate pseudopressure Regularization output (q/ Δ p
p) and abscissa pseudotime function t
caconsider to become the gas reservoir dynamic holdup evaluation under the flowing bottomhole pressure (FBHP) condition of production.Wherein
c
gfor gas compressibility factor, MPa
-1; Subscript i represents that gas well do not produce before measurement value, i.e. original value; T is the production time, unit sky;-represent average, as
represent gas reservoir gas average viscosity value under current time.T
cafor material balance equivalent time, in gas reservoir blowdown process, the PVT change of properties of gas is very large, therefore in material balance equivalent time function, should consider that gas viscosity and compression coefficient change (utilizing viscosity and compression coefficient under t moment mean reservoir pressure), the form of employing pseudotime characterizes the whole production time of gas well.
The 3rd diagnosis curve early stage non-stationary flow stage of plate was one group of r
e/ r
wadifferent curves, wherein r
efor gas well gas drainage radius, the m of unit, r
wafor wellbore radius, the m of unit, the boundary current control stage pools a slope for-1 straight line, as shown in Figure 4, finally all collects for straight line, wherein reD=r for the curve of different reD (zero dimension wellbore radius)
e/ (r
wae
-s), s is skin factor, zero dimension.The method is consistent with above-mentioned two kinds of water enchroachment (invasion)s diagnosis curve (first diagnosis curve and second opinion curve), all adopts gas well actual measurement output, pressure data to draw.
Researcher always hankers after adopting the 3rd diagnosis curve to carry out the evaluation of individual well dynamic holdup, and has ignored the production dynamic diagnosis function of this plate.As shown in Figure 4, for water drive gas well, on the 3rd diagnosis curve plate, also can identify not water enchroachment (invasion) phase, water enchroachment (invasion) initial stage and water enchroachment (invasion) middle and later periods three phases, principle and above-mentioned the first diagnosis curve water enchroachment (invasion) recognition principle are similar.The water enchroachment (invasion) recognition function of this plate does not have the first diagnosis curve responsive yet, and especially stage water enchroachment (invasion) middle and later periods is responsive not.
The example that Fig. 5-7 are analyzed for the actual gas well water enchroachment (invasion) in aqueous vapor field at the bottom of adopting above-mentioned three kinds of diagnosis curves to certain limit.From three kinds of diagnosis curves, can identify clearly gas well not water enchroachment (invasion) phase, water enchroachment (invasion) initial stage and water enchroachment (invasion) middle and later periods, and three kinds of diagnosis curves corresponding time consistency when judgement gas well water enchroachment (invasion), and consistent with actual production.Adopt the method for the embodiment of the present invention in the sequencing judgement of the water breakthrough time of the well of implication more than 50 of Tarim Oilfield, accuracy is more than 80%.
During concrete enforcement, when the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion, can also carry out assistant analysis further combined with existing water enchroachment (invasion) determination methods.Wherein existing water enchroachment (invasion) determination methods for example can comprise well-logging method and/or water cone production rate limit method.The method that is the embodiment of the present invention can be carried out assistant analysis as well-logging method, water cone production rate limit method etc. in conjunction with existing water enchroachment (invasion) recognition methods.
A kind of gas well production yield control method is also provided in embodiments of the present invention, and as shown in Figure 8, the handling process of this gas well production yield control method can comprise:
Step 801, according to Fig. 1, be shown with Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
Step 802, when gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, reduce gas well daily output tolerance; When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
Flow process can be learnt as shown in Figure 8, in the embodiment of the present invention can according to aforementioned reliability high, have the judged result of Gas Reservoirs individual well water enchroachment (invasion) situation to carry out the control of gas well output, can rationally control gas well producing pressure differential, improve the anhydrous gas production phase of gas well, make gas reservoir integral body reach balanced exploitation, can greatly improve the whole development effect of gas reservoir.
Based on same inventive concept, a kind of have Gas Reservoirs individual well water enchroachment (invasion) situation judgment means and gas well output control device in the embodiment of the present invention, are also provided, as described in the following examples.The principle of dealing with problems due to these devices to have Gas Reservoirs individual well water enchroachment (invasion) situation determination methods and gas well production yield control method similar, so the enforcement of these devices can, referring to the enforcement of correlation method, repeat part and repeat no more.
Fig. 9 is the schematic diagram that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention.As shown in Figure 9, in the embodiment of the present invention, have Gas Reservoirs individual well water enchroachment (invasion) situation judgment means to comprise:
The first Drawing of Curve module 901, for
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve;
The second Drawing of Curve module 902, for G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve;
The 3rd Drawing of Curve module 903, for t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve;
The first curve judge module 904, for the first diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The second curve judge module 905, for second opinion curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The 3rd curve judge module 906, for the 3rd diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
Judgement conclusion output module 907, consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve for the judged result when the first diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion;
Wherein, G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas; t
cafor pseudotime function.
Figure 10 is the instantiation figure that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention.As shown in figure 10, Fig. 9 shown device can also comprise:
Pressure determination module 1001, for determining p
i; By p
ibe converted to p
pi; Determine p
wtf; According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf;
Wherein, p
ifor gas well initial pressure, p
wtffor gas well mouth pressure.
Figure 11 is the instantiation figure that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention.As shown in figure 11, Fig. 9 shown device can also comprise:
Time determination module 1101, for determining t by following formula
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
Figure 12 is the instantiation figure that has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention.As shown in figure 12, Fig. 9 shown device can also comprise:
The first curve fitting module 1201, for carrying out curve fitting to the first diagnosis curve;
The second curve fitting module 1202, for carrying out curve fitting to second opinion curve;
The 3rd curve fitting module 1203, for carrying out curve fitting to the 3rd diagnosis curve;
The first curve judge module 904 specifically can carry out the judgement of gas well water enchroachment (invasion) for the first diagnosis curve to after curve;
The second curve judge module 905 specifically can carry out for the second opinion curve to after curve the judgement of gas well water enchroachment (invasion);
The 3rd curve judge module 906 specifically can carry out the judgement of gas well water enchroachment (invasion) for the 3rd diagnosis curve to after curve.
During concrete enforcement, judgement conclusion output module 907 can be further used for, when the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion, in conjunction with existing water enchroachment (invasion) determination methods, carrying out assistant analysis.
During concrete enforcement, existing water enchroachment (invasion) determination methods can comprise well-logging method and/or water cone production rate limit method.
Figure 13 is the schematic diagram of gas well output control device in the embodiment of the present invention.As shown in figure 13, this gas well output control device can comprise:
Prediction module 1301, for utilizing arbitrary the be shown with Gas Reservoirs individual well water enchroachment (invasion) situation judgment means of Fig. 9 to Figure 12, prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
Gas well output control module 1302, for entering water enchroachment (invasion) initial stage or water enchroachment (invasion) when gas well during the middle and later periods, reduces gas well daily output tolerance; When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
In sum, in the embodiment of the present invention, for the judgement that has Gas Reservoirs individual well water enchroachment (invasion) situation, the daily output tolerance, pressure data that has adopted gas well is as basic data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thereby reaches the object of accurate judgement gas well water enchroachment (invasion); Owing to adopting dynamic output, pressure data in whole gas well manufacturing process to judge water enchroachment (invasion), thereby taken into full account the impact that gas reservoir non-homogeneity causes---the impact gas well output, pressure being changed, and the impact of gas well production system change etc., therefore more tally with the actual situation.
In addition, according to there being the judged result of Gas Reservoirs individual well water enchroachment (invasion) situation to carry out the control of gas well output, can rationally controlling gas well producing pressure differential, improve the anhydrous gas production phase of gas well, make gas reservoir integral body reach balanced exploitation, can greatly improve the whole development effect of gas reservoir.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect completely.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing device is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable devices.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (14)
1. there is a Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, it is characterized in that, comprising:
With
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve;
With G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve;
With t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve;
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods; When with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
When the judged result of the first diagnosis curve is consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion;
Wherein, G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas; t
cafor pseudotime function.
2. the method for claim 1, is characterized in that, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, also comprises:
Determine p
i;
By p
ibe converted to p
pi;
Determine p
wtf;
According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf;
Wherein, p
ifor gas well initial pressure, p
wtffor gas well mouth pressure.
3. the method for claim 1, is characterized in that, before drawing the 3rd diagnosis curve, also comprises by following formula and determines t
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
4. the method for claim 1, it is characterized in that, before respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve being carried out to the judgement of gas well water enchroachment (invasion), also comprise: respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out curve fitting;
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion), comprising: respectively the first diagnosis curve after curve, second opinion curve and the 3rd diagnosis curve are carried out to the judgement of gas well water enchroachment (invasion).
5. the method for claim 1, is characterized in that, while providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, also further combined with existing water enchroachment (invasion) determination methods, carries out assistant analysis.
6. the method for claim 1, is characterized in that, described existing water enchroachment (invasion) determination methods comprises well-logging method and/or water cone production rate limit method.
7. a gas well production yield control method, is characterized in that, comprising:
According to there being Gas Reservoirs individual well water enchroachment (invasion) situation determination methods described in claim 1 to 6 any one, prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
When gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, reduce gas well daily output tolerance;
When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
8. there is a Gas Reservoirs individual well water enchroachment (invasion) situation judgment means, it is characterized in that, comprising:
The first Drawing of Curve module, for
for abscissa, with q/ Δ p
pfor ordinate, draw the first diagnosis curve;
The second Drawing of Curve module, for G
pfor abscissa, with p
wf/ Z is ordinate, draws second opinion curve;
The 3rd Drawing of Curve module, for t
cafor abscissa, with q/ Δ p
pfor ordinate, draw the 3rd diagnosis curve;
The first curve judge module, for the first diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the first diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The second curve judge module, for second opinion curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, second opinion curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
The 3rd curve judge module, for the 3rd diagnosis curve is carried out to the judgement of gas well water enchroachment (invasion): when with sealing constant volume gas reservoir or water drive gas reservoir not water enchroachment (invasion) compare, the 3rd diagnosis curve upwards skew judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward and judges that gas well carries out the water enchroachment (invasion) middle and later periods;
Judgement conclusion output module, consistent with the judged result of second opinion curve and/or the 3rd diagnosis curve for the judged result when the first diagnosis curve, the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion;
Wherein, G
pfor the cumulative gas production of gas well current time, p
pifor the pseudopressure form of gas well initial pressure,
for the oil reservoir Average Quasi pressure of gas well current time, p
pwffor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is gas well daily output tolerance, Δ p
p=p
pi-p
pwf; p
wffor gas well flowing bottomhole pressure (FBHP); Z is deviation factor for gas; t
cafor pseudotime function.
9. device as claimed in claim 8, is characterized in that, also comprises:
Pressure determination module, for determining p
i; By p
ibe converted to p
pi; Determine p
wtf; According to wellbore tubular, flow principle by p
wtfbe converted to p
wf, then by p
wfbe converted to p
pwf;
Wherein, p
ifor gas well initial pressure, p
wtffor gas well mouth pressure.
10. device as claimed in claim 8, is characterized in that, also comprises:
Time determination module, for determining t by following formula
ca:
Wherein, μ is gas viscosity; C
gfor gas compressibility factor, i represents initial value, and t is the production time ,-expression average,
for current time gas reservoir gas average viscosity;
for gas reservoir gas average compression coefficient constantly at that time.
11. devices as claimed in claim 8, is characterized in that, also comprise:
The first curve fitting module, for carrying out curve fitting to the first diagnosis curve;
The second curve fitting module, for carrying out curve fitting to second opinion curve;
The 3rd curve fitting module, for carrying out curve fitting to the 3rd diagnosis curve;
The first curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the first diagnosis curve to after curve;
The second curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the second opinion curve to after curve;
The 3rd curve judge module carries out the judgement of gas well water enchroachment (invasion) specifically for the 3rd diagnosis curve to after curve.
12. devices as claimed in claim 8, is characterized in that, judgement conclusion output module is further used for, when the judged result with the first diagnosis curve provides gas well water enchroachment (invasion) conclusion, in conjunction with existing water enchroachment (invasion) determination methods, carrying out assistant analysis.
13. devices as claimed in claim 8, is characterized in that, described existing water enchroachment (invasion) determination methods comprises well-logging method and/or water cone production rate limit method.
14. 1 kinds of gas well output control device, is characterized in that, comprising:
Prediction module, has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means for utilizing described in claim 8 to 13 any one, and prediction has Gas Reservoirs individual well water enchroachment (invasion) situation;
Gas well output control module, for entering water enchroachment (invasion) initial stage or water enchroachment (invasion) when gas well during the middle and later periods, reduces gas well daily output tolerance; When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) during the middle and later periods, maintain or improve gas well daily output tolerance.
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