CN108150158A - A kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology - Google Patents
A kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims description 18
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- 238000009833 condensation Methods 0.000 claims description 14
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- 238000011160 research Methods 0.000 claims description 11
- 239000000460 chlorine Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- -1 kalium ion Chemical class 0.000 claims description 4
- 235000013619 trace mineral Nutrition 0.000 claims description 4
- 239000011573 trace mineral Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
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- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
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Abstract
The invention discloses a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodologies, include the following steps：Step 1, stratum water sampling is carried out to having the gas well at situ metrology station, carry out water conventional chemical analysis and judges whether water sample is contaminated；Step 2, judge the water type of taken unpolluted undisturbed formation water；Step 3, the synthesis geochemistry plate of water flooding type identification is established；Step 4, water flooding type Temporal Evolution curve is built；Step 5, water sampling is carried out to the gas well without measuring equipment in gas testing phase, pilot production phase or production, determines to take unpolluted undisturbed formation water type；In conjunction with representative gas well production water type and water yield Evolution curve, the sampled well residing production water stage is judged, and then predict that stratum aquatic products goes out trend；Have the characteristics that effectively keep away water and predictablity rate height, improve exploiting economy benefit.
Description
Technical field
The invention belongs to deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS exploration and development technical field, more particularly to a kind of deeper clefts
Property DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology.
Background technology
Compact sandstone gas occupies very important status, deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS in China's natural gas industry
It is the hot fields of compact sandstone gas exploration and development, is influenced by tight sandstone reservoir reservoir space ambient condition, formation tomography-
The multiple dimensioned reservoir space system of crack-matrix pores, is influenced by the factors such as fracture development anisotropism and complex pore structure,
Cause water flooding occurrence status, distribution characteristics and water chemistry property complicated, there are the universal water breakthrough of individual well, part well produces after going into operation
Water breakthrough waits geological problems soon.In development process, natural gas well production water gently then makes reservoir that water-blocking effect occur, heavy then linked up by crack
Edge-bottom water causes water enchroachment (invasion), water logging, seriously affects the stable and high yields of gas well, even results in gas well and scraps.Therefore, research and development deep layer is split
The analysis of seam property DAMAGE OF TIGHT SAND GAS RESERVOIRS water flooding legacy systems and production water trend prediction technology are most important to gas reservoir Efficient Development.
It there is no water body systematic analytic method and the early warning for deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS maturation both at home and abroad at present
Technology.Forefathers' generally use empirical method, such as Sichuan Basin Xu jiahe Fractured DAMAGE OF TIGHT SAND GAS RESERVOIRS, forefathers are by gas well
It is condensation water and clean formation water to produce moisture, and condensation aquatic products goes out that stage water yield is very low, and chloride content is very low；Go out in clean formation aquatic products
In the stage, gas well water yield is big, and water sample chloride content is high.During gas well liquid loading, once water yield is higher, and have what is continued to increase
Trend shows that clean formation aquatic products to be entered goes out the stage, gas well face water enchroachment (invasion), water logging risk, need to take control production, control water in time
Measure.But these empirical methods not yet form system analysis technique, are unfavorable for Fractured DAMAGE OF TIGHT SAND GAS RESERVOIRS stratum aquatic products regimen
The early stage understanding of condition and prediction.
For carbonate oil-gas reservoir, it is proposed that a kind of fracture hole type carbonate oil-gas reservoir water analysis system and method.The party
Water flooding is divided into fracture water, edge-bottom water, pent-up water and condensation water by method, passes through water flooding conventional analysis parameter and leakage drilling fluid
Parameter or absorption well water sample parameter comparison, judge whether water sample is contaminated；According to water sample Geochemical Parameters and region
Layer water chemistry mean parameter relativity with reference to sampled well water flooding production curve feature, judges water sample type, and then propose
Development technique adjusts countermeasure.
Deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS buried depth is big, drilling cost is high, risk is big, early warning water flooding occurrence types
With trend, to effectively keeping away water in production process, improve development benefit and play an important roll.
The prior art one：For DAMAGE OF TIGHT SAND GAS RESERVOIRS water flooding output and evolution Feature, it is empirical that forefathers form some
Knowledge of regularity, water flooding is developed from condensation water to clean formation water during gas well liquid loading, when water flooding chloride content is with production
Between elapse and become larger.But for Fractured DAMAGE OF TIGHT SAND GAS RESERVOIRS, there are no the system analysis technique method bodies for forming quantification
System.
The prior art two：A kind of fracture-cavity type carbonate oil-gas reservoir water analysis system and method.This method is first by sample
Whether the water sample basic parameter of this oil/gas well is original state with leakage drilling fluid or offset well water sample parameter comparison, judgement sample water sample
Water flooding；Then according to sample water sample whether be undisturbed formation water judging result, by sample water sample type parameter and regional water
Sample mean parameter compares, judgement sample water sample type；And then combine gas well and produce water tracing pattern, water sampling well is produced
Measure adjusts.The present invention identifies producing well output water body type by judgement, and for different water body features, producing well is formulated not
Same development technique measure.
The technical disadvantages of the prior art two：
1) it is not for deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS, the two Reservoir type, water-gas distribution and output mechanism exist
Essential distinction, it is impossible to substitute and use；
2) inadequate quantification, whether water sample is contaminated, water flooding type identification, does not propose quantitative evaluation methods；
3) water flooding type needs to use gas well liquid loading evolution curve in judging, that is, produces and arrived the stage, ability
Judge water flooding type and output trend, make the prediction effect of " gaining the initiative by striking first " reduce；The acquisition of the curve simultaneously, needs longer
The production of time and follow-on test moisture content, and some wells do not have metered condition.
Invention content
The purpose of the present invention is to provide a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology,
To solve the above problems.
To achieve the above object, the present invention uses following technical scheme：
A kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology, which is characterized in that including following
Step：
Step 1 carries out stratum water sampling, and judge whether water sample is contaminated really to having the gas well at situ metrology station
Determine whether institute's water sampling is undisturbed formation water；
Step 2, by having gas field produced on-site water-gas ratio, the well data that continuous chloride content measures and based on
Research area's water flooding is divided into condensation water, transitional water, intermediate water and clean formation by the water flooding Type division experience plate of formation
Water, and judge the water type of taken not comtaminated undisturbed formation water sample；
Step 3, carries out undisturbed formation water sample water conventional ion and geochemistry of trace element is analyzed, with reference to known class
Type formation water geochemistry data, build multi-parameter crossplot, and the preferably high parameter structure water flooding type geochemistry of discrimination is sentenced
Other plate；
Step 4 carries out water sampling, according to step 1 to the gas well without measuring equipment in gas testing phase, pilot production phase or production
With multi-parameter crossplot version in step 3, the judgement of water sample pollution level and water flooding type geochemical discrimination are gradually carried out, really
It is fixed to take undisturbed formation water type.
Step 5, selection have water yield per day, daily output tolerance, live chlorine root and continuously analyze typical gas well；It is produced with individual well
Water-gas ratio is ordinate, the production time is abscissa, according to water-gas ratio Temporal Evolution feature and water flooding type identification
Plate divides water flooding type distribution phase；Using well production water type, yield Temporal Evolution law curve as foundation, can determine whether
The water sampling well residing production water stage, and then predict that stratum aquatic products goes out trend.
Further, in step 1, the pollution of water flooding is there are mainly two types of source, and one is that drilling well lost fluid pollutes, and two are
Acidic fracturing fluid pollutes, and for different pollution sources, using different pollution level method of discrimination, is rubbed respectively by kalium ion and natrium ion
That content ratio, i.e. rNa+/rK+Value and exception NO3 -Ion concentration differentiates.
Further, in step 1, Cl is carried out to institute's water sampling-、SO4 2-、CO3 2-、NO3 -、Na+、K+、Ca2+And Mg2+Phase
To content analysis, by known pollution water sample and non-polluting water sample chemical constituent feature plate, differentiate whether institute's water sampling is former
Shape water flooding.
Further, in step 5, in the early stage of production, water-gas ratio is stable low value and chloride content is low, is
Condensation aquatic products goes out the stage；Over time, production water-gas ratio rises, corresponding water flooding chloride content increases, and is transitional water output
Stage；Later, production water-gas ratio, which changes over time, tends towards stability, and is clean formation water or intermediate water output stage.
Compared with prior art, the present invention has following technique effect：
The present invention has better quantitative analysis effect as a result of stratum water pollution degree geochemical discrimination method
Fruit so that human factor influences to reduce during undisturbed formation water judges, the accuracy enhancing of judgement；
Differentiation of the present invention for water flooding type on the basis of actual formation water occurrence characteristics and EVOLUTION ANALYSIS, uses
The method that water conventional analysis, trace element analysis etc. are combined establishes the geochemistry plate of water flooding type identification, avoids
The unfavorable factor of production water-gas ratio shortage of data, has and does not need to creation data and the long-term follow-on test of formation water geochemistry data
The characteristics of, it saved workload, reduced financial cost, the timely and effective judgement output of gas well of different working conditions can be directed to
Water flooding type；
The present invention summarizes research area and represents in well production process, different type water flooding occurrence characteristics and evolution trend,
Differentiated by water flooding type geochemistry plate as a result, producing well water flooding output trend can be predicted, there is gas well to produce water
The characteristics of dynamic early prediction；Data used is all from gas field produce reality data, and the practicability of method is stronger, water flooding type
It is more accurate with output trend to judge.
Description of the drawings
Fig. 1 is the implementation process diagram of the deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS water body systematic analytic method of the present invention；
The stratum water pollution degree that Fig. 2 is the present invention differentiates plate；
Fig. 3 produces water-gas ratio-chloride content water flooding Type division plate for research target area；
Fig. 4 (a) is the logarithmic plot of strontium element-chloride ion content water flooding type identification plate；
Fig. 4 (b) is the coordinate diagram that counts of strontium element-chloride ion content water flooding type identification plate；
Fig. 5 (a) is the logarithmic plot of boron element-chloride ion content water flooding type identification plate；
Fig. 5 (b) is the coordinate diagram that counts of boron element-chloride ion content water flooding type identification plate；
Fig. 6 is the typical well water flooding occuring regularity prognostic chart of the present invention；
Fig. 7 differentiates figure for KD709 wells initial pilot development water sample pollution level of the present invention；
Fig. 8 produces water-gas ratio change curve during being KD709 wells pilot production of the present invention；
Fig. 9 differentiates figure for water sample pollution level in KD3-12 wells of the present invention production；
Figure 10 (a) is KD3-12 well water sample types chlorion-strontium element content water flooding type identification figure；
Figure 10 (b) is KD3-12 well water sample types chlorion-boron content water flooding type identification figure；
Figure 11 produces water-gas ratio for KD3-12 wells of the present invention and changes over time figure.
Specific embodiment
Below in conjunction with attached drawing, the present invention is further described：
The implementation process diagram of the present invention is shown in Fig. 1, acquires water sample first and collects production test data, establishes water flooding
Whether network analysis database, judgement sample are contaminated.The water sample well drill log is examined or check, leakage in drilling process is specified and sends out
Raw frequency and drilling fluid chloride content (reagent containing KCl causes).Whether examination water sampling interval have passed through reservoir fracturing improvement, if
Fracturing reform is experienced, and gets into fracturing fluid significantly lower than lifting rate is returned, the contaminated probability of water sample will greatly increase；Even if it returns
Lifting rate, which is more than, gets into pressure break liquid measure, and since the anisotropism of reservoir is strong, it is not comtaminated water sample can not to be completely secured.Therefore,
Institute's water sampling has to examine by geochemical analysis, and finally whether determining water sample is contaminated.Such as, it is fetched water to KD709 wells
Sample analysis shows that, gas well initial pilot development water sample have relatively low sodium potassium ion ratio (rNa+/rK+), show to be tried by containing KCl
The drilling fluid contamination of agent causes water sample sodium-potassium ion component relationship to be different from undisturbed formation water (table 1).To not comtaminated stratum
Water further carries out strontium element, boron element experimental analysis, by water flooding type geochemical discrimination plate, determines the water sample
Type.
Finally, according to water flooding type identification as a result, going out Evolution curve, prediction water sampling by Different Strata aquatic products
The water flooding output stage residing for well, and predict the output evolving trend of water flooding, propose that producing well keeps away water measure and development plan
Adjustment is suggested.
1 KD709 wells of example
A kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology, include the following steps：
Step 1, according to the well data of the production water-gas ratio with specification, live chlorine root data, (acquisition of the data needs
Producing well site has measuring station, and not all well all has measuring station and acquires the data, this is also the reality that the present invention is directed to
One of problem), according to area is studied on the basis of more implication well creation datas, the water flooding Type division method formed is drawn
Divide and take undisturbed formation water type；Such as the occurrence status according to water flooding, research area's water flooding is divided into condensation water, transition
Water, intermediate water and clean formation water.Wherein, condensation water is the vaporous water dissolved in natural gas, based on low yield, low chloride content
Want feature；Gas well be in water outlet early stage, water yield is more stable at this time, the stage produce condensation water to Influence of production not
Greatly.Clean formation water is mainly the edge-bottom water except gas-bearing formation, and water yield is big, also maximum to the harm of production, and reservoir may be formed
Water enchroachment (invasion), water logging etc. seriously destroy.In tight sandstone reservoir, due to powerful capillary resistance, during natural gas origin insufficient strength,
The worse reservoir of part physical property show as air water coexist, common output, formed intermediate water；Sandwich portion diagenesis intensity and side
Bottom water area has differences, and to be usually weaker than the latter；The stage stratum production aquatic products amount compares larger.Transitional water is normal gas reservoir
In production process, the late period that condensation aquatic products goes out has a small amount of intermediate water or edge-bottom water to be mixed into, and production water type is gradually to intermediate water or side
The intermediate form that bottom water develops；The stage stratum water yield gradually increases, and has the tendency that linking up edge-bottom water, should take and keep away early
Water, waterproof measure rationally adjust production system, reduce production risk.
Step 2, wet well sampling is carried out to having the gas well at situ metrology station, and judges whether water sample is contaminated；By
Drilling fluid leakage, fracturing fluid intrusion are had in drilling process, is contaminated undisturbed formation water, it is impossible to reflect primitive character.
Therefore, identification pollution water flooding is first had in stratum aqueous systems system analytic process, obtains undisturbed formation water sample.Water is established in proposition
Water conventional chemical rational judgment method whether sample is contaminated, in view of there are mainly two types of sources for the pollution of water flooding, one is drilling well
Lost fluid pollutes, and two pollute for acidic fracturing fluid, for different pollution sources, using different pollution level method of discrimination.It is right
Institute's water sampling carries out water conventional analysis (Cl-、SO4 2-、CO3 2-、NO3 -、Na+、K+、Ca2+、Mg2+Relative amount), pass through known pollution
Water sample and non-polluting water sample chemical constituent feature plate differentiate whether institute's water sampling is that (or contaminated degree is very faint for original state
Water flooding).It is generally polluted by acidic fracturing fluid, water sample has the NO of high level3 -, drilling well lost fluid pollutes, external due to having
KCl reagents, lead to rNa+/rK+Ratio reduces, and such as studies area with rNa+/rK+Than being damaged formation water and original state for 15 and 25
The boundary value (Fig. 2) of water flooding.
Step 3, production water-gas ratio-chloride content relationship that information well formed is had definitely according to gas field scene
Layer water type experience plate (Fig. 3) differentiates institute's water sampling type；Trace element analysis is further carried out to undisturbed formation water sample,
With reference to water conventional analysis data, the synthesis geochemistry plate of water flooding type identification is established.I.e. according to known type water flooding
Chemical data builds multi-parameter crossplot, the preferably high parameter of discrimination, establishes water flooding type geochemical discrimination plate,
Such as in this research target area, the water flooding type identification plate built using strontium element, boron element and chloride ion content, application effect
Well (Fig. 4, Fig. 5).
Step 4, research area's typical production well is chosen, it is desirable that have daily output tolerance and the long-term measurement data of water yield, and mesh
Before have been enter into extensive production water stage or production later stage, according to production water-gas ratio Temporal Evolution trend and its aqueous vapor ratio,
Water flooding type is built with production time Evolution curve (Fig. 6).
Step 5, water sampling is carried out to the gas well without measuring equipment in formation testing phase, pilot production phase or production, according to above-mentioned each
Class plate gradually carries out water sample pollution judgement, water flooding type geochemical discrimination, determines undisturbed formation water type；Pass through again
Typical gas well production water type and yield Evolution curve, judge the water sampling well residing production water stage, and then predict stratum aquatic products
Go out trend, the adjustment implementation for development stimulation provides scientific basis.
This method can totally be divided into stratum water pollution degree discrimination module, water flooding type identification module and stratum aquatic products
Go out trending early warning module.
In the deep block south wing of Kuche Depression of Talimu Basin carat Soviet Union structural belt gram, be that the area is important surveys KD709 well locations
Evaluation well is visited, water-gas distribution situation is directly related to the fair exploration evaluation in Nan Yi new districts.The well was July 5 in 2015
Day starts production testing operation, and due to sandstone reservoir densification, fracture acidizing has been carried out to pilot production well section.Respectively on July 13rd, 2015
Water sampling 10 is total to on October 15th, 2015.Drilling-log report display is checked, is occurred in drilling process in interval of interest more
Secondary leakage event, reagent containing KCl in drilling fluid, it is about 23000mg/L to be scaled chloride content.It therefore, should to institute's water sampling
Consider the double influence of drilling fluid and fracturing fluid.Water conventional chemical analysis shows, institute water sampling nitrate ion (NO3 -) content is very
It is low, it is influenced by fracturing fluid smaller；But K in by drilling fluid+Ion is mixed into influence, stratum water sample rNa+/rK+Ratio is former less than region
Shape water flooding standard value (25) (table 1, Fig. 7).Therefore, which receives a degree of pollution.With taking
The passage of water sample time, water sample rNa+/rK+Ratio gradually increases, and shows that polluting water flooding gradually discharges, and produces aqueous nature to original state
Water flooding develops.
1 library vehicle down warping region KD709 well initial pilot development water sample analysis data of table
Although it produces aqueous nature to develop to clean formation water state, under with reference to pre-production phase water yield (water-gas ratio) having gradually
The feature of drop, gas production increase trend is apparent, and daily gas increases to 350,000 sides (Fig. 8) steadily by 250,000 sides, whereupon it may be inferred that this
Water yield should be unable to be too big in latter period, and at least payzone is not yet linked up edge-bottom water by crack and influenced.It is it is therefore proposed that raw
Unit is produced, which can proceed with production.Facts proved that the well has no that extensive stratum aquatic products goes out, gas production is continual and steady, real
Economical and efficient exploitation is showed.Well closing well on January 1st, 2016, as standby reserves development well.
2 KD3-12 wells of example
KD3-12 wells are that a bite of the big northern structural belt in library vehicle down warping region carat Soviet Union's structural belt west section evaluates well, completion depth
7490m.Generation leakage 1 time in Cretaceous System Ba Shijiqike group brown packsands stratum in drilling process, drilling fluid is tried containing KCl
Agent, chloride ion content is between 58500~80800mg/L.On October 2,1 day~2012 October in 2012 to 7209m~
7244m well sections are tested, and convert into daily gas 195700m3, daily output water 1.94m3(density 1.00g/cm3, chlorine root 1620mg/L,
For condensation water), test result is gas-bearing formation.On October 2nd, 2012 carries out completion acidizing pressure break to the well section, injects the total acid solution in stratum
337.03m3, production is successively asked using 9mm, 10mm oil nozzle open flow, whole process adds up drain 203.63m3.Subsequently enter production rank
Section, early stage water yield is relatively low, predominantly condensation water.After steady production about 25 months, production on May 12nd, 2014 water-gas ratio is earlier above
One stage was risen, but amplitude is little.On December 17th, 2014 carries out water sampling, and water conventional chemical analysis is shown, sample
Substantially it is not comtaminated, it is reliable undisturbed formation water (Fig. 9).Strontium element, boron content are further analyzed, and passes through water flooding
Type identification plate, which analyzes the water sample, has clean formation water feature (Figure 10).In time to production unit suggestion, it should adopt as early as possible
It takes and effectively keeps away water measure, it is contemplated that will go out the stage into a large amount of clean formation aquatic products in the recent period.With that is, production unit reduces daily gas
Amount, takes and mildly seeks production mode, effectively to reduce formation water rate, improves natural gas percolation ability and drainage area.
Produce reality shows that the well is maintained nearly 11 months with relatively low water yield (low water-gas ratio), in November, 2015
13, water yield started to be significantly increased, and illustrates in the case where Paraclase is linked up, fairly large water enchroachment (invasion) (Figure 11) has had occurred.By
In the financial burden to decline to a great extent with a large amount of stratum water process of Gas Productivity, the processing that closes a well in has been carried out to the well.
The carly fruit drop of KD3-12 well water flooding outputs works with early warning, expands the Gas Productivity of the well to the maximum extent, realizes
The maximization of economic benefit.
Effect explanation：By use above example, illustrate this method and differentiate the applications well effect of plate.Due to each
The foundation of class plate be based on actual production data, can be with the geology actual conditions in image study area.Stratum water pollution
Degree and water flooding type identification plate (Fig. 2, Fig. 3 and Fig. 4) are limited, the boundary value in plate by analysis sample spot quantity
It is not absolute, but its variation tendency range reflected is reliable；With increasing for data point, plate can be more perfect.
Fig. 4 illustrates research area's typical case's well production water type and its Evolution, can represent the production hydrodynamic(al) of research area's major part producing well
State evolution Feature for the similar gas well of geologic feature, according to the production water evolution curve, can predict that stratum aquatic products goes out type with moving
State changing rule.Really, the present invention focuses on thinking and method, and all kinds of plates cannot be indiscriminately imitated applied to other basins or gas in figure
Field needs thinking and method according to the present invention, and all kinds of plates are made with the adjustment for meeting research area's reality, is formed targeted
Water flooding occurrence types judge with Forecasting Methodology system.
Claims (4)
1. a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis and Forecasting Methodology, which is characterized in that including following step
Suddenly：
Step 1 carries out stratum water sampling to having the gas well at situ metrology station, and judges whether water sample is contaminated and institute
Whether water sampling is undisturbed formation water；
Step 2, by having well data of gas field produced on-site water-gas ratio, continuous chloride content and based on established
Research area's water flooding Type division is condensation water, transitional water, intermediate water and clean formation water, and sentence by layer water Type division plate
The water type of disconnected taken not comtaminated undisturbed formation water sample；
Step 3 carries out geochemistry of trace element analysis again to undisturbed formation water sample, with reference to known type formation water geochemistry number
According to the high parameter structure water flooding type geochemical discrimination plate of structure multi-parameter crossplot version, preferably discrimination；
Step 4 carries out water sampling, according to step 1 and step to the gas well without measuring equipment in formation testing phase, pilot production phase or production
Multi-parameter crossplot version in rapid three gradually carries out the judgement of water sample pollution level and water flooding type geochemical discrimination, determines institute
Take undisturbed formation water type；
Step 5, chooses research area's representativeness individual well, and admission data includes the company of water yield per day, daily output tolerance, live chlorine root
Continuous analysis data；It is abscissa to produce water-gas ratio as ordinate, production time using individual well, according to water-gas ratio Temporal Evolution
Feature and water flooding type identification plate divide water flooding type distribution phase；It is drilled at any time with producing well production water type, yield
Law curve is foundation, can determine whether the water sampling well residing production water stage, and then predict that stratum aquatic products goes out trend.
2. a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis according to claim 1 and Forecasting Methodology,
It is characterized in that, in step 1, the pollution of water flooding is there are mainly two types of source, and one is the pollution of drilling well lost fluid, and two be acid pressure break
Liquid pollutes, and for different pollution sources, using different pollution level method of discrimination, passes through kalium ion and natrium ion molar content ratio respectively
Value, i.e. rNa+/rK+Value and exception NO3 -Ion concentration differentiates.
3. a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis according to claim 1 and Forecasting Methodology,
It is characterized in that, in step 1, Cl is carried out to institute's water sampling-、SO4 2-、CO3 2-、NO3 -、Na+、K+、Ca2+And Mg2+Relative amount point
Analysis by known pollution water sample and non-polluting water sample chemical constituent feature plate, differentiates whether institute's water sampling is undisturbed formation water.
4. a kind of deeper clefts DAMAGE OF TIGHT SAND GAS RESERVOIRS early stage water analysis according to claim 1 and Forecasting Methodology,
It is characterized in that, in step 5, in the early stage of production, water-gas ratio is stable low value and chloride content is low, is condensation aquatic products
Go out the stage；Over time, production water-gas ratio rises, corresponding water flooding chloride content increases, and is the transitional water output stage；It
Afterwards, production water-gas ratio, which changes over time, tends towards stability, and is clean formation water or intermediate water output stage.
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