CN104141490B - Method and device for judging water invasion condition of single well with water-gas reservoir and controlling gas well yield - Google Patents
Method and device for judging water invasion condition of single well with water-gas reservoir and controlling gas well yield Download PDFInfo
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Abstract
The invention discloses a method and a device for judging water invasion condition of a single well with a water-gas reservoir and controlling gas well yield, wherein the method for judging the water invasion condition of the single well with the water-gas reservoir comprises the following steps: to be provided withAs abscissa, in q/Δ ppDrawing a first diagnostic curve for the ordinate; with GpAs abscissa, with pwfthe/Z is a vertical coordinate, and a second diagnosis curve is drawn; with tcaAs abscissa, in q/Δ ppDrawing a third diagnostic curve for the ordinate; respectively judging the water invasion of the gas well according to the first diagnostic curve, the second diagnostic curve and the third diagnostic curve; and the comprehensive judgment result gives a conclusion of gas well water invasion; gpIs the cumulative gas production of the gas well at the current moment, ppiIn a pseudo-pressure form of the initial pressure of the gas well,the average pseudo pressure p of the oil reservoir at the current moment of the gas wellpwfIs a pseudo-pressure form of the bottom flowing pressure of the gas well, q is the daily gas production of the gas well, and delta pp＝ppi‑ppwf；pwfThe bottom flowing pressure of the gas well; z is a gas deviation factor; t is tcaAs a function of pseudo-time. The method can improve the reliability of judging the water invasion condition of the single well with the water-gas reservoir and reasonably control the yield of the gas well.
Description
Technical field
The present invention relates to gas reservoir development technical field, particularly relate to the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation and gas well production yield control method and device.
Background technology
For having the gas reservoir development of stronger edge-bottom water energy, the problem worried most is exactly gas well water breakthrough.Gas well once water breakthrough, not only causes a lot of trouble, it is critical only that simultaneously and can be substantially reduced gas well capacity, cause gas well to yield poorly and closing well too early engineering aspects such as floor treatment, thus largely effects on gas deposit recovery efficiency and final development effectiveness.Therefore, accurately gas well water breakthrough is predicted in advance, and conservative control gas well liquid loading pressure reduction, raising gas well anhydrous gas production phase, make gas reservoir entirety reach equilibrium exploitation, the whole development effect of gas reservoir can be greatly improved.
Both at home and abroad gas well water breakthrough time Forecasting Methodology is conducted in-depth research, generally use percolation equationk to derive the prediction bottomwater gas field gas well water breakthrough time, i.e. provide water-cone breakthrough Time Calculation formula to predict the concrete water breakthrough time of gas well.But owing to actual gas reservoir anisotropism is relatively strong and during gas well liquid loading, system constantly adjusts, cause the prediction using these methods to carry out gas well water breakthrough or water enchroachment (invasion), bigger with practical situation gap, and various method evaluation result is quite different, makes the research worker suitable method of more difficult selection carry out water enchroachment (invasion) research.Also there is the employing method such as material balance method and gas reservoir water influx indicative curve that gas well water enchroachment (invasion) is predicted, but limitation is also compared in the method application, because the method needs gas well test more static pressure data point and can be only achieved preferably prediction after having certain recovery percent of reserves, but actual gas well static pressure test point is less and during a lot of well water breakthrough recovery percent of reserves the most relatively low.Also having and use well testing double logarithmic curve to be predicted gas well water enchroachment (invasion), the method opposite side water water enchroachment (invasion) situation can realize preferably predicting, but more difficult to bottomwater gas field prediction, and Gas well test analytical data is less, is difficult to every implication well carries out water enchroachment (invasion) prediction accurately.Therefore, until the prediction of current gas well water enchroachment (invasion) is still a technical barrier the most urgently to be resolved hurrily.
Summary of the invention
The embodiment of the present invention provides one to have Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, and in order to improve the reliability having Gas Reservoirs individual well water enchroachment (invasion) situation to judge, the method includes:
WithFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；
With GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；
With tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, the 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
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, then provide gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve；
Wherein, GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；tcaFor pseudotime function.
In one embodiment, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, also include:
Determine pi；
By piBe converted to ppi；
Determine pwtf；
According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf；
Wherein, piFor gas well initial pressure, pwtfFor gas well mouth pressure.
In one embodiment, before drawing the 3rd diagnosis curve, also include determining t as followsca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient at that time.
In one embodiment, before respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve being carried out gas well water enchroachment (invasion) judgement, also include: 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 gas well water enchroachment (invasion) judgement, including: respectively the first diagnosis curve after curve matching, second opinion curve and the 3rd diagnosis curve are carried out gas well water enchroachment (invasion) judgement.
In one embodiment, when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, also carry out assistant analysis further combined with existing water enchroachment (invasion) determination methods.
In one embodiment, described existing water enchroachment (invasion) determination methods includes well-logging method and/or water cone production rate limit method.
The embodiment of the present invention also provides for a kind of gas well production yield control method, and in order to conservative control gas well yield, the method includes:
Gas Reservoirs individual well water enchroachment (invasion) situation determination methods is had, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation according to above-mentioned；
When gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, reduce gas well daily output tolerance；
When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
The embodiment of the present invention also provides for one Gas Reservoirs individual well water enchroachment (invasion) situation judgment means, and in order to improve the reliability having Gas Reservoirs individual well water enchroachment (invasion) situation to judge, this device includes:
First curve plotting module, forFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；
Second curve plotting module, for GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；
3rd curve plotting module, for tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；
First curve judge module, for the first diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Second curve judge module, for second opinion curve being carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
3rd curve judge module, for the 3rd diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Judge 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, then provide gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve；
Wherein, GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；tcaFor pseudotime function.
In one embodiment, this device also includes:
Pressure determines module, is used for determining pi；By piBe converted to ppi；Determine pwtf；According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf；
Wherein, piFor gas well initial pressure, pwtfFor gas well mouth pressure.
In one embodiment, this device also includes:
Time determines module, for determining t as followsca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient at that time.
In one embodiment, this device also includes:
First curve fitting module, for carrying out curve fitting to the first diagnosis curve；
Second curve fitting module, for carrying out curve fitting to second opinion curve；
3rd curve fitting module, for carrying out curve fitting to the 3rd diagnosis curve；
First curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the first diagnosis curve after curve matching；
Second curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the second opinion curve after curve matching；
3rd curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the 3rd diagnosis curve after curve matching.
In one embodiment, it is judged that conclusion output module is further used for, when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, carrying out assistant analysis in conjunction with existing water enchroachment (invasion) determination methods.
In one embodiment, described existing water enchroachment (invasion) determination methods includes well-logging method and/or water cone production rate limit method.
The embodiment of the present invention also provides for a kind of gas well production control devices, and in order to conservative control gas well yield, this device includes:
Prediction module, being used for utilizing above-mentioned has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation；
Gas well yield control module, for when gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, reduces gas well daily output tolerance；When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
In the embodiment of the present invention, for there being the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, have employed based on the daily output tolerance of gas well, pressure data data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thus reaching accurately to judge the purpose of gas well water enchroachment (invasion)；Owing to the dynamic output during the whole gas well liquid loading of employing, pressure data judge water enchroachment (invasion), thus taken into full account the impact that gas well yield, pressure are i.e. changed by the impact that gas reservoir anisotropism causes, and the impact etc. that gas well liquid loading system changes, the most more tally with the actual situation.
Additionally, carry out gas well yield control according to the judged result having Gas Reservoirs individual well water enchroachment (invasion) situation, it is possible to conservative control gas well liquid loading pressure reduction, raising gas well anhydrous gas production phase, make gas reservoir entirety reach equilibrium exploitation, the whole development effect of gas reservoir can be greatly improved.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the process chart having 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 that in the embodiment of the present invention, actual gas well first diagnoses curve water enchroachment (invasion) divided stages schematic diagram；
Fig. 6 is actual gas well second opinion curve water enchroachment (invasion) divided stages schematic diagram in the embodiment of the present invention；
Fig. 7 is actual gas well the 3rd diagnosis curve water enchroachment (invasion) divided stages 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 having 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 having 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 production control devices in the embodiment of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawings the embodiment of the present invention is described in further details.Here, the 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 having Gas Reservoirs individual well water enchroachment (invasion) situation to judge, the embodiment of the present invention provides one to have Gas Reservoirs individual well water enchroachment (invasion) situation determination methods.Fig. 1 is the process chart having Gas Reservoirs individual well water enchroachment (invasion) situation determination methods in the embodiment of the present invention, as it is shown in figure 1, there is Gas Reservoirs individual well water enchroachment (invasion) situation determination methods may include that in the embodiment of the present invention
Step 101, drafting the first diagnosis curve；Specifically withFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；
Step 102, drafting second opinion curve, specifically with GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；
Step 103, drafting the 3rd diagnosis curve, specifically with tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；tcaFor pseudotime function；The execution sequencing of step 101,102 and 103 can be changed；
Step 104, respectively to first diagnosis curve, second opinion curve and the 3rd diagnosis curve carry out gas well water enchroachment (invasion) judgement；Concrete, when, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, the first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, the 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Step 105, when judged result and the second opinion curve of the first diagnosis curve and/or the judged result of the 3rd diagnosis curve are consistent, then provide gas well water enchroachment (invasion) conclusion with the first judged result diagnosing curve.
Flow process is appreciated that as shown in Figure 1, in the embodiment of the present invention, for there being the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, have employed based on the daily output tolerance of gas well, pressure data data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thus reaching accurately to judge the purpose of gas well water enchroachment (invasion)；Owing to the dynamic output during the whole gas well liquid loading of employing, pressure data judge water enchroachment (invasion), thus taken into full account the impact that gas well yield, pressure are i.e. changed by the impact that gas reservoir anisotropism causes, and the impact etc. that gas well liquid loading system changes, the most more tally with the actual situation.
When being embodied as, before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, it is also possible to comprise determining that pi, piFor gas well initial pressure；By piBe converted to ppi；Determine pwtf, pwtfFor gas well mouth pressure；According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf。
When being embodied as, before drawing the 3rd diagnosis curve, it is also possible to include determining as follows tca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient at that time.
In embodiment before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, can first measure the original formation pressure before gas well does not produces i.e. gas well initial pressure pi, measure daily output tolerance q and well head pressure p of gas well every daywtf；The gas PVT data of the representative gas well in gas field can also be measured, including the critical temperature of gas, critical pressure, gas relative density, gas component composition, deviation factor for gas (Z changes with pressure), coefficient of compressibility (Cg, change with pressure).By pit shaft pipe flow principle by pwtfConversion is flowing bottomhole pressure (FBHP) pwf, then by piAnd pwfConversion is gas pseudopressure form ppiAnd ppwf。
When being embodied as, before respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve being carried out gas well water enchroachment (invasion) judgement, it is also possible to including: respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out curve fitting.Follow-up when carrying out gas well water enchroachment (invasion) and judging, respectively the first diagnosis curve after curve matching, second opinion curve and the 3rd diagnosis curve can be carried out gas well water enchroachment (invasion) judgement.
Such as, with gas well daily output tolerance q and Δ pp=ppi-ppwfRatio as vertical coordinate, withFor abscissa mapping (drawing the first diagnosis curve), data points all in figure are carried out curve regression fit, illustrates that when regression fit curve substantially offsets up now gas well is possibly into the water enchroachment (invasion) initial stage；When regression fit curve offsets downwards, illustrate that now gas well is possibly into water enchroachment (invasion) middle and late stage；
Again with gas well cumulative production as abscissa, (drawing second opinion curve) is mapped for vertical coordinate with the ratio of gas well flowing bottomhole pressure (FBHP) with deviation factor for gas, all of point is carried out curvilinear regression matching, and when regression fit curve offsets up, explanation is now possibly into the water enchroachment (invasion) initial stage；When regression fit curve offsets downwards, illustrate now possibly into water enchroachment (invasion) middle and late stage；
Again with gas well daily output tolerance q and Δ pp=ppi-ppwfRatio as vertical coordinate, with zero dimension material balance time tcaFor abscissa mapping (drawing the 3rd diagnosis curve), carry out contrasting matching to all eyeballs and Blasingame typical curve plots, find optimal matched curve, then good with matching Blasingame typical curve carries out analogy, and when measured curve offsets up, explanation is now possibly into the water enchroachment (invasion) initial stage；When curve offsets downwards, illustrate now possibly into water enchroachment (invasion) middle and late stage；
When the first situation in above-mentioned three kinds of Forecasting Methodologies occurs identical predicting the outcome occur with the one or two kinds of in other two kinds of situations simultaneously, now this gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage.
Diagnose curve the following detailed description of the first diagnosis curve, second opinion curve and the 3rd and carry out being embodied as of gas well water enchroachment (invasion) judgement.
(1) first diagnosis curve
First diagnosis curve vertical coordinate is pseudopressure Regularization yield q/ Δ pp, it is defined as follows:
Q is individual well current production rate, m3/d；P is pressure, MPa；μ is gas viscosity, mpa s；Z is deviation factor for gas, zero dimension.Vertical coordinate can be regarded as gas well current production rate and intends at present the ratio of producing pressure differential, and can be approximately considered is the current production capacity index of gas well.And the abscissa of this diagnosis curve isAbscissa can approximate to be regarded gas well as and tires out to produce and intend the ratio of producing pressure differential at present with well.For closing 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 having Gas Reservoirs, this diagnosis curve shows as syllogic, correspond to non-water enchroachment (invasion) phase, water enchroachment (invasion) initial stage, water enchroachment (invasion) middle and late stage three phases respectively, as shown in Figure 2.The most in this article, subscript i represents that gas well does not produces pre-test value, i.e. original value, such as piFor gas well initial pressure, GiFor gas well cumulative gas production initial value；Subscript r represents gas reservoir value, such as prFor gas reservoir pressure；Subscript f represents slamp value, such as pwfFor gas well flowing pressure.
The diagnosis curve closing gas reservoir is that someone is proved straight line, straight line and the dynamic holdup that intersection point is gas reservoir of transverse axis.Research worker hankers after carrying out the dynamic holdup evaluation of gas reservoir/well by the method always, but have ignored the method application in Production development is analyzed.This diagnosis curve is owing to taking full advantage of yield and the stream pressure data of the every day of well, and the change of tracing pattern fully reflects Production development and the change of well surrounding formation of well.For water drive gas reservoir, non-water enchroachment (invasion) phase i.e. well does not receives supplementing of any edge-bottom water water energy, and the well area that loses heart not yet feeds through to water body, and diagnosis curve is initial stage straightway.After disappointing area feeds through to water body, after i.e. gas reservoir is supplemented by water energy, gas well exploitation enters the water enchroachment (invasion) initial stage, and the gas well deliverability index of axis of ordinates is uninfluenced, and abscissa is unchanged, but because gas reservoir pressure decline slows down after being supplemented by water energy, piThe p more corresponding than the closing gas reservoir under same caseiValue is big, causes curve the most offset above.For water enchroachment (invasion) middle and late stage, edge-bottom water has broken through to around well, for the initial stage of middle and late stage, although gas well may also not produce water, but owing to around gas well or certain direction is surrounded by water, gas flow is obstructed, and filtrational resistance substantially becomes big, under the conditions of causing identical gas production, producing pressure differential substantially becomes big, i.e. gas well index number of producing gas diminishes；And for after the later stage i.e. gas well water breakthrough of water enchroachment (invasion) middle and late stage, gas well capacity index can reduce rapidly especially, the rapid reduction of index number of producing gas, for diagnosing on curve first, then show as curve and substantially the most substantially diminish toward lower left skew i.e. X value and Y value.It addition, in order to draw this curve, need Production development data i.e. yield and the stream pressure data of the fluid properties data of gas well, well log interpretation parameter and gas well, and the on-the-spot every mouthful of well of these data all have relevant data.Therefore every mouthful of well all can draw this water enchroachment (invasion) diagnosis curve.Find that curve water enchroachment (invasion) actual to gas well changes very sensitive dynamically by the actual application of this diagnosis curve, water enchroachment (invasion) recognition accuracy can be reached more than 80%, be the main graph of gas well water enchroachment (invasion) situation judgement.
(2) second opinion curve
Second opinion curve vertical coordinate is the ratio of gas well stream pressure and deviation factor for gas, and abscissa is gas well accumulation produced quantity.Being characterized in that this curve is a straightway for closing gas reservoir, the straightway using pressure decline method with this gas reservoir is the most parallel, therefore when, after the original reservoir strata pressure understanding gas well, just utilizing the control dynamic holdup of second opinion curve prediction gas well.And pressure decline method curve is always by the water enchroachment (invasion) identification curve as a kind of gas reservoir, closing gas reservoir pressure decline method curve is straight line, as shown by dotted lines in figure 3.A material balance pressure decline method curve being to use static pressure data in Fig. 3, one is that the i.e. this method of second opinion curve using flowing pressure uses the curve analyzing water enchroachment (invasion).
For having Gas Reservoirs, after the later stage has water energy to supplement, pressure decline method curve starts to turn right offset above, the corresponding water enchroachment (invasion) stage.But pressure decline method only can recognize that two stages, and owing to actual gas well test static pressure data are little, identifies that function is restricted the most significantly.But second opinion curve is owing to using daily output tolerance and stream pressure data (stream pressure can use oil pressure or casing pressure data to be obtained) by the conversion of pit shaft pipe flow method, thus this curve actual data point is the most.And second opinion curve shows three sections of property to Water Invasion Characteristics, correspondence non-water enchroachment (invasion) phase, water enchroachment (invasion) initial stage, water enchroachment (invasion) middle and late stage three phases respectively.For the water enchroachment (invasion) initial stage, consistent with pressure decline method feature, reason is consistent, i.e. gas well receives the certain energy supplement of extraneous water body but production capacity is not affected.For water enchroachment (invasion) middle and late stage, similar with the first diagnosis curve, after edge-bottom water is advanced to shaft bottom, index number of producing gas substantially reduces, and producing pressure differential increases, and flowing bottomhole pressure (FBHP) reduces rapidly, and curve offsets downwards.But the amplitude of offseting downward will not have, as the first diagnosis curve, the trend that X value diminishes, because second opinion curve X-axis is cumulative gas production, this value is as producing and is gradually increased, and simply after gas well water breakthrough, amplification substantially slows down.The water enchroachment (invasion) identification function of second opinion curve does not has the first diagnosis curve sensitive, and the especially water enchroachment (invasion) middle and late stage stage is the most sensitive.
(3) the 3rd diagnosis curves
3rd diagnosis curve negotiating introduces vertical coordinate pseudopressure Regularization yield (q/ Δ pp) and abscissa pseudotime function tcaConsider to become the gas reservoir protection Reserves Evaluation under the flowing bottomhole pressure (FBHP) condition of production.WhereinCgFor gas compressibility factor, MPa-1；Subscript i represents that gas well does not produces pre-test value, i.e. original value；T is the production time, unit sky；▔Represent meansigma methods, asRepresent gas reservoir gas average viscosity value under current time.tcaFor material balance equivalent time, during gas reservoir blowdown, the PVT qualitative change of gas is the biggest, therefore in material balance equivalent time function, it is specifically contemplated that gas viscosity and coefficient of compressibility change (utilizing viscosity and coefficient of compressibility under t mean reservoir pressure), uses the form of pseudotime to characterize the whole production time of gas well.
The 3rd diagnosis curve plate non-stationary flow stage in early days is one group of re/rwaDifferent curves, wherein reFor gas well gas drainage radius, unit m, rwaFor wellbore radius, unit m, it is the straight line of-1 that the boundary current control stage pools a slope, and as shown in Figure 4, the curve for different reD (zero dimension wellbore radius) the most all collects for straight line, wherein reD=re/(rwae-s), s is skin factor, zero dimension.The method is consistent with above two water enchroachment (invasion) diagnosis curve (first diagnosis curve and second opinion curve), all uses gas well actual measurement yield, pressure data to draw.
Research worker is also always to hanker after using the 3rd diagnosis curve to carry out individual well dynamic holdup evaluation, and have ignored the Production development diagnostic function of this plate.As shown in Figure 4, for water drive gas well, can also identify non-water enchroachment (invasion) phase, water enchroachment (invasion) initial stage and water enchroachment (invasion) middle and late stage three phases on the 3rd diagnosis curve plate, principle is similar with above-mentioned first diagnosis curve water enchroachment (invasion) recognition principle.The water enchroachment (invasion) identification function of this plate does not has the first diagnosis curve sensitive yet, and the especially water enchroachment (invasion) middle and late stage stage is the most sensitive.
Fig. 5-7 is the example using above-mentioned three kinds of diagnosis curves to analyze certain edge-bottom water gas field actual gas well water enchroachment (invasion).From three kinds of diagnosis curves, gas well non-water enchroachment (invasion) phase, water enchroachment (invasion) initial stage and water enchroachment (invasion) middle and late stage can be identified clearly, and three kinds diagnose curve correspondence time consistencies when judging gas well water enchroachment (invasion), and consistent with actual production.The method using the embodiment of the present invention judges at the water breakthrough time sequencing of the well of implication more than 50 of Tarim Oilfield, and accuracy is more than 80%.
When being embodied as, when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, it is also possible to carry out assistant analysis further combined with existing water enchroachment (invasion) determination methods.The most existing water enchroachment (invasion) determination methods such as can include well-logging method and/or water cone production rate limit method.The i.e. method of the embodiment of the present invention can carry out assistant analysis in conjunction with existing water enchroachment (invasion) recognition methods such as well-logging method, water cone production rate limit method etc..
Also providing for a kind of gas well production yield control method in embodiments of the present invention, as shown in Figure 8, the handling process of this gas well production yield control method may include that
Step 801, according to Fig. 1 be shown with Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation；
Step 802, when gas well enters the water enchroachment (invasion) initial stage or during water enchroachment (invasion) middle and late stage, reduce gas well daily output tolerance；When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
Flow process is appreciated that as shown in Figure 8, in the embodiment of the present invention can high according to aforementioned reliability, have the judged result of Gas Reservoirs individual well water enchroachment (invasion) situation to carry out gas well yield control, can conservative control gas well liquid loading pressure reduction, improve the gas well anhydrous gas production phase, make gas reservoir entirety reach equilibrium exploitation, the whole development effect of gas reservoir can be greatly improved.
Based on same inventive concept, additionally providing one in the embodiment of the present invention has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means and gas well production control devices, as described in the following examples.Owing to the principle of these devices solution problem is similar to having Gas Reservoirs individual well water enchroachment (invasion) situation determination methods and gas well production yield control method, therefore the enforcement of these devices may refer to the enforcement of correlation method, repeats no more in place of repetition.
Fig. 9 is the schematic diagram having Gas Reservoirs individual well water enchroachment (invasion) situation judgment means in the embodiment of the present invention.As it is shown in figure 9, the embodiment of the present invention there is Gas Reservoirs individual well water enchroachment (invasion) situation judgment means may include that
First curve plotting module 901, forFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；
Second curve plotting module 902, for GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；
3rd curve plotting module 903, for tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；
First curve judge module 904, for the first diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Second curve judge module 905, for second opinion curve being carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
3rd curve judge module 906, for the 3rd diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Judge 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, then provide gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve；
Wherein, GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；tcaFor pseudotime function.
Figure 10 is the instantiation figure having 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 include:
Pressure determines module 1001, is used for determining pi；By piBe converted to ppi；Determine pwtf；According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf；
Wherein, piFor gas well initial pressure, pwtfFor gas well mouth pressure.
Figure 11 is the instantiation figure having 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 include:
Time determines module 1101, for determining t as followsca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient at that time.
Figure 12 is the instantiation figure having 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 include:
First curve fitting module 1201, for carrying out curve fitting to the first diagnosis curve；
Second curve fitting module 1202, for carrying out curve fitting to second opinion curve；
3rd curve fitting module 1203, for carrying out curve fitting to the 3rd diagnosis curve；
First curve judge module 904 specifically may be used for the first diagnosis curve after curve matching is carried out gas well water enchroachment (invasion) judgement；
Second curve judge module 905 specifically may be used for the second opinion curve after curve matching is carried out gas well water enchroachment (invasion) judgement；
3rd curve judge module 906 specifically may be used for the 3rd diagnosis curve after curve matching is carried out gas well water enchroachment (invasion) judgement.
When being embodied as, it is judged that conclusion output module 907 can be further used for, when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, carrying out assistant analysis in conjunction with existing water enchroachment (invasion) determination methods.
When being embodied as, existing water enchroachment (invasion) determination methods can include well-logging method and/or water cone production rate limit method.
Figure 13 is the schematic diagram of gas well production control devices in the embodiment of the present invention.As shown in figure 13, this gas well production control devices may include that
Prediction module 1301, is used for utilizing arbitrary the be shown with Gas Reservoirs individual well water enchroachment (invasion) situation judgment means of Fig. 9 to Figure 12, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation；
Gas well yield control module 1302, for when gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, reduces gas well daily output tolerance；When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
In sum, in the embodiment of the present invention, for there being the judgement of Gas Reservoirs individual well water enchroachment (invasion) situation, have employed based on the daily output tolerance of gas well, pressure data data and use three kinds of diagnosis curves to carry out the judgement of gas well water enchroachment (invasion), thus reaching accurately to judge the purpose of gas well water enchroachment (invasion)；Owing to the dynamic output during the whole gas well liquid loading of employing, pressure data judge water enchroachment (invasion), thus taken into full account the impact that gas well yield, pressure are i.e. changed by the impact that gas reservoir anisotropism causes, and the impact etc. that gas well liquid loading system changes, the most more tally with the actual situation.
Additionally, carry out gas well yield control according to the judged result having Gas Reservoirs individual well water enchroachment (invasion) situation, it is possible to conservative control gas well liquid loading pressure reduction, raising gas well anhydrous gas production phase, make gas reservoir entirety reach equilibrium exploitation, the whole development effect of gas reservoir can be greatly improved.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program.Therefore, the form of the embodiment in terms of the present invention can use complete hardware embodiment, complete software implementation or combine software and hardware.And, the present invention can use the form at one or more upper computer programs implemented of computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) wherein including computer usable program code.
The present invention is to describe with reference to method, equipment (system) and the flow chart of computer program according to embodiments of the present invention and/or block diagram.It should be understood that can be by the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces the manufacture including command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to perform sequence of operations step on computer or other programmable devices to produce computer implemented process, thus the instruction performed on computer or other programmable devices provides the step of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame for realization.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (14)
1. one kind has Gas Reservoirs individual well water enchroachment (invasion) situation determination methods, it is characterised in that including:
WithFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；
With GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；
With tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；
Respectively the first diagnosis curve, second opinion curve and the 3rd diagnosis curve are carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；When, compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, the 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
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, then provide gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve；
Wherein, GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；tcaFor pseudotime function.
2. the method for claim 1, it is characterised in that before drawing the first diagnosis curve, second opinion curve and the 3rd diagnosis curve, also include:
Determine pi；
By piBe converted to ppi；
Determine pwtf；
According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf；
Wherein, piFor gas well initial pressure, pwtfFor gas well mouth pressure.
3. the method for claim 1, it is characterised in that before drawing the 3rd diagnosis curve, also include determining t as followsca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient 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 gas well water enchroachment (invasion) judgement, also include: 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 gas well water enchroachment (invasion) judgement, including: respectively the first diagnosis curve after curve matching, second opinion curve and the 3rd diagnosis curve are carried out gas well water enchroachment (invasion) judgement.
5. the method for claim 1, it is characterised in that when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, also carry out assistant analysis further combined with existing water enchroachment (invasion) determination methods.
6. method as claimed in claim 5, it is characterised in that described existing water enchroachment (invasion) determination methods includes well-logging method and/or water cone production rate limit method.
7. a gas well production yield control method, it is characterised in that including:
Gas Reservoirs individual well water enchroachment (invasion) situation determination methods is had, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation according to any one of claim 1 to 6；
When gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, reduce gas well daily output tolerance；
When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
8. one kind has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means, it is characterised in that including:
First curve plotting module, forFor abscissa, with q/ Δ ppFor vertical coordinate, draw the first diagnosis curve；
Second curve plotting module, for GpFor abscissa, with pwf/ Z is vertical coordinate, draws second opinion curve；
3rd curve plotting module, for tcaFor abscissa, with q/ Δ ppFor vertical coordinate, draw the 3rd diagnosis curve；
First curve judge module, for the first diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, first diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Second curve judge module, for second opinion curve being carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, second opinion curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
3rd curve judge module, for the 3rd diagnosis curve is carried out gas well water enchroachment (invasion) judgement: when compared with closing constant volume gas reservoir or the non-water enchroachment (invasion) of water drive gas reservoir, 3rd diagnosis curve offsets up and then judges that gas well enters the water enchroachment (invasion) initial stage, offsets downward, judges that gas well carries out water enchroachment (invasion) middle and late stage；
Judge 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, then provide gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve；
Wherein, GpFor the cumulative gas production of gas well current time, ppiFor the pseudopressure form of gas well initial pressure,For the oil reservoir Average Quasi pressure of gas well current time, ppwfFor the pseudopressure form of gas well flowing bottomhole pressure (FBHP), q is that gas well produces tolerance, Δ p dailyp=ppi-ppwf；pwfFor gas well flowing bottomhole pressure (FBHP)；Z is deviation factor for gas；tcaFor pseudotime function.
9. device as claimed in claim 8, it is characterised in that also include:
Pressure determines module, is used for determining pi；By piBe converted to ppi；Determine pwtf；According to pit shaft pipe flow principle by pwtfBe converted to pwf, then by pwfBe converted to ppwf；
Wherein, piFor gas well initial pressure, pwtfFor gas well mouth pressure.
10. device as claimed in claim 8, it is characterised in that also include:
Time determines module, for determining t as followsca:
Wherein, μ is gas viscosity；CgFor gas compressibility factor, i represents initial value, and t is the production time,▔Represent meansigma methods,For current time gas reservoir gas average viscosity；For moment gas reservoir gas average compression coefficient at that time.
11. devices as claimed in claim 8, it is characterised in that also include:
First curve fitting module, for carrying out curve fitting to the first diagnosis curve；
Second curve fitting module, for carrying out curve fitting to second opinion curve；
3rd curve fitting module, for carrying out curve fitting to the 3rd diagnosis curve；
First curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the first diagnosis curve after curve matching；
Second curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the second opinion curve after curve matching；
3rd curve judge module is specifically for carrying out gas well water enchroachment (invasion) judgement to the 3rd diagnosis curve after curve matching.
12. devices as claimed in claim 8, it is characterised in that judge that conclusion output module is further used for, when providing gas well water enchroachment (invasion) conclusion with the judged result of the first diagnosis curve, carrying out assistant analysis in conjunction with existing water enchroachment (invasion) determination methods.
13. devices as claimed in claim 12, it is characterised in that described existing water enchroachment (invasion) determination methods includes well-logging method and/or water cone production rate limit method.
14. 1 kinds of gas well production control devices, it is characterised in that including:
Prediction module, is used for utilizing described in any one of claim 8 to 13 and has Gas Reservoirs individual well water enchroachment (invasion) situation judgment means, it was predicted that have Gas Reservoirs individual well water enchroachment (invasion) situation；
Gas well yield control module, for when gas well enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, reduces gas well daily output tolerance；When gas well not yet enters water enchroachment (invasion) initial stage or water enchroachment (invasion) middle and late stage, maintain or improve gas well daily output tolerance.
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