CN105221134A - A kind of Fractured Gas Wells returns the method for discrimination that discharge opeing and formation water are formed - Google Patents

A kind of Fractured Gas Wells returns the method for discrimination that discharge opeing and formation water are formed Download PDF

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CN105221134A
CN105221134A CN201510677082.8A CN201510677082A CN105221134A CN 105221134 A CN105221134 A CN 105221134A CN 201510677082 A CN201510677082 A CN 201510677082A CN 105221134 A CN105221134 A CN 105221134A
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gas well
discharge opeing
single gas
formation water
formation
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CN105221134B (en
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代金友
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China University of Petroleum Beijing
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Abstract

The present invention relates to a kind of Fractured Gas Wells and return the method for discrimination that discharge opeing and formation water form, it is characterized in that: 1) according to the on-the-spot gas testing dynamic data of each single gas well in whole district's Fractured Gas Wells in district to be measured, draw the gas testing curve of each single gas well; And the production fluid type of each single gas well is judged according to the variation tendency of the gas testing curve of each single gas well; 2) when the production fluid type of single gas well is only for returning discharge opeing, directly can differentiate that the production fluid of this single gas well is formed; When the production fluid type of single gas well is for returning discharge opeing and formation water, set up the relation schema figure of single gas well chloride content and Liquid output according to the gas testing curve of this single gas well; 3) differentiation returning discharge opeing and formation water formation of single gas well is carried out; 4) according to the formation returning discharge opeing and formation water of each single gas well, determine that whole district's Fractured Gas Wells returns the formation of discharge opeing and formation water.The present invention forms the production fluid of each single gas well and judges, determine the water outlet order of severity in gas well and gas field, contribute to accurate assurance gas reservoir and produce the impact of water on exploitation, for concrete gas well liquid loading working system and the formulation keeping away water measure provide important evidence and important references.

Description

A kind of Fractured Gas Wells returns the method for discrimination that discharge opeing and formation water are formed
Technical field
The present invention relates to a kind of Fractured Gas Wells and return the method for discrimination that discharge opeing and formation water form, belong to gas field production technical field.
Background technology
China gas field is most is less than the Oil in Super-low Permeability gas field of 1md for permeability, as: gas field of pacifying the border region, gas field, Liu Yang fort, Yulin Gas Field, DaNiuDi gas field, Guang'an Gas Field etc.The water outlet type in existing gas field is broadly divided into three classes by the origin cause of formation, i.e. connate formation water, external intermediary water and return discharge opeing.Wherein, connate formation water and external intermediary water all belong to formation water.As shown in table 1, connate formation water is divided into again primary edge-bottom water and primary occluded water.Primary edge-bottom water be distributed in lower location of the structure Gas water boundary near, in obvious water layer feature, salinity is high and gas testing curve shows as in a large number, stable product water.Primary occluded water in Filling process because reservoir properties is poor, the water of gas drained strength not and in residual stratum, therefore without obvious pure water layer, gas saturation is higher, salinity is higher and on gas testing curve water yield per day more stable.External intermediary water is the water from other layer of position, main relevant with the communication in tomography and crack, because interlayer water breakthrough can cause a large amount of water outlet of gas well, therefore gas testing initial stage aquifer yield is stablized, but aquifer yield can rise suddenly after a period of time, its salinity is higher and there are differences with connate formation water salinity.Return the partial open liquid and other working solution that residue in stratum after carrying out pressing crack construction before discharge opeing is operation, its mineralization degree is lower, a large amount of water outlet of short period at gas testing initial stage, declines until working solution returns drained rapidly subsequently.
These gas fields above-mentioned are buried deeply owing to existing, diagenesis is strong, the defect of poor properties, therefore cause the low problem of natural production capacity and occur, and in order to address this problem, prior art many employings fracturing methods build the method for product.But gas testing stage production fluid is obvious after part has Gas Reservoirs (as gas field, Liu Yang fort) pressure break, returning discharge opeing and formation water in production fluid, to form understanding unclear, and then the Accurate Prediction of production capacity power and the concrete foundation generation severe jamming building product working system are built to later stage gas field, thus material impact is produced to gas field development deployment and Efficient Development.But domestic and international at present the ultralow Gas Reservoirs Fractured Gas Wells that is impregnated with is returned to the judgement that discharge opeing and formation water form and still lacks report, therefore cannot precise and high efficiency gas field be developed.
Table 1
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of simple to operate, efficiently and accurately Fractured Gas Wells return the method for discrimination that discharge opeing and formation water are formed.
For achieving the above object, the present invention takes following technical scheme: a kind of Fractured Gas Wells returns the method for discrimination that discharge opeing and formation water are formed, and it is characterized in that:
1) according to the on-the-spot gas testing dynamic data of each single gas well in whole district's Fractured Gas Wells in district to be measured, draw the gas testing curve of each single gas well, judge the production fluid type of each single gas well according to the variation tendency of the gas testing curve of each single gas well; The production fluid type of single gas well comprises two kinds of situations, and one only produces to return discharge opeing, and another kind produces to return discharge opeing and formation water;
2) the production fluid formation of single gas well is differentiated:
When the production fluid type of single gas well returns discharge opeing for only producing, the production fluid formation that directly can determine this Fractured Gas Wells is all return discharge opeing;
When the production fluid type of single gas well is for returning discharge opeing and formation water, set up the relation schema figure of single gas well chloride content and Liquid output according to the gas testing curve of single gas well, by chloride content standardization, the production fluid returning discharge opeing and formation water carrying out single gas well forms and differentiates:
1. according to the relation schema figure of single gas well chloride content and Liquid output, determine the minimum value min (Cl) of the maximum value max (Cl) of the chloride content of gas testing stage single gas well, chloride content, chloride content Cli under arbitrary time, stablize water yield per day W dpwith accumulative Liquid output F p;
2. by chloride content standardized method, the accumulative formation water rate of single gas well is determined:
W p = W d p Σ i = 1 n C 1 i - m i n ( C 1 ) m a x ( C 1 ) - min ( C 1 ) ;
In formula, W pfor the accumulative formation water rate of single gas well, the chloride content that Cli is single gas well liquid loading date when being i, min (Cl) represents the minimum value of the chloride content of single gas well, the maximum value that max (Cl) is the chloride content of single gas well; W dpfor the stable water yield per day of single gas well;
3. according to the accumulative formation water rate of single gas well, determine that the accumulative of single gas well returns discharge opeing output:
FB p＝F p-W p；
In formula, F pfor the accumulative Liquid output of single gas well, FB pfor the accumulative of single gas well returns discharge opeing output, W pfor the accumulative formation water rate of single gas well;
3) according to the accumulative output returning discharge opeing and formation water of each single gas well, the formation returning discharge opeing and formation water of single gas well and the formation returning discharge opeing and formation water of whole district's Fractured Gas Wells is determined:
In formula, RFB single gas welldischarge opeing ratio is returned for single gas well, for the accumulative of whole district's Fractured Gas Wells returns discharge opeing output sum, ∑ F pfor the accumulative Liquid output sum of whole district's Fractured Gas Wells, RFB the whole districtfor the whole district returns discharge opeing ratio;
4) according to single gas well return discharge opeing ratio and the whole district returns discharge opeing ratio, and then the formation returning discharge opeing and formation water of confirmation form gas well and whole district's Fractured Gas Wells.
Carry out single gas well to return the relation schema figure that discharge opeing and formation water form chloride content and the Liquid output differentiated be, when only product returns discharge opeing, drop to 0 rapidly in the production fluid curve short time; When product returns discharge opeing and formation water, production fluid curve is decline stable type, and chloride content curve is rising stable type, namely represents that gas testing initial stage gas well returns discharge opeing to produce, and along with the rising of chloride content, progressively transition is for producing formation water.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the production fluid formation of the present invention to each single gas well judges, the ratio returned shared by discharge opeing and formation water can be implemented in single gas well production fluid, determine the water outlet order of severity in gas well and gas field, contribute to accurate assurance gas reservoir and produce the impact of water on exploitation, for concrete gas well liquid loading working system and the formulation that keeps away water measure provide important evidence, for the screening of gas field block, well site deployment and build production capacity force estimation and provide important references.2, the present invention is owing to calculating the fracturing fluid of gas well and the discharge capacity of returning of other working solutions, therefore, it is possible to judge fracturing fluid and the hold-up of other working solutions on stratum, can provide foundation and reference accurately for follow-up gas well management.3, the present invention is owing to can judge the formation water water discharging time of gas well according to gas testing curve, therefore, it is possible to judge that gas well output returns the deadline of discharge opeing in time, for gas well liquid loading management provides foundation and reference.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the chloride content of single gas well of the present invention and the relation schema figure of Liquid output;
Fig. 3 is the gas testing curve production fluid figure of A well in embodiment;
Fig. 4 is the gas testing curve production fluid figure of B well in embodiment;
Fig. 5 is the gas testing curve chloride content figure of B well in embodiment;
Fig. 6 is the chloride content of B well and the graph of a relation of Liquid output in embodiment;
Fig. 7 is the pie graph returning discharge opeing and formation water of B well in embodiment;
Fig. 8 is the pie graph returning discharge opeing and formation water of the Liu Yang fort too 2 gas reservoir whole districts in embodiment.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in detail.
The present invention proposes a kind of Fractured Gas Wells and return the method for discrimination that discharge opeing and formation water form, as shown in Figure 1, it comprises the following steps:
1) according to the on-the-spot gas testing dynamic data of each single gas well in whole district's Fractured Gas Wells in district to be measured, draw the gas testing curve of each single gas well, judge the production fluid type of each single gas well according to the variation tendency of the gas testing curve of each single gas well; The production fluid type of single gas well comprises two kinds of situations, and one only produces to return discharge opeing: production fluid curve drops to 0 rapidly in short-term; Another kind produces to return discharge opeing and formation water: production fluid curve declines early stage, and the later stage steadily and be greater than 0; Corresponding chlorine root curve rises early stage, and the later stage is steady.
2) differentiation of the production fluid formation of single gas well:
When the production fluid type of single gas well returns discharge opeing for only producing, the production fluid formation that directly can determine this Fractured Gas Wells is all return discharge opeing.
When the production fluid type of single gas well is for returning discharge opeing and formation water, the relation schema figure (as shown in Figure 2) of single gas well chloride content and Liquid output is set up according to the gas testing curve of single gas well, by chloride content standardization, the production fluid returning discharge opeing and formation water carrying out single gas well forms and differentiates:
1. according to the relation schema figure of single gas well chloride content and Liquid output, determine the minimum value min (Cl) of the maximum value max (Cl) of the chloride content of gas testing stage single gas well, chloride content, chloride content Cli under arbitrary time, stablize water yield per day W dp(aquifer yield after stable testing, close to the stratum water yield) and accumulative Liquid output F p;
2. by chloride content standardized method, the accumulative formation water rate of single gas well is determined:
W p = W d p Σ i = 1 n C 1 i - m i n ( C 1 ) m a x ( C 1 ) - min ( C 1 ) ;
In formula, W pfor the accumulative formation water rate of single gas well, the chloride content that Cli is single gas well liquid loading date when being i, min (Cl) represents the minimum value of the chloride content of single gas well, the maximum value that max (Cl) is the chloride content of single gas well; W dpfor the stable water yield per day of single gas well;
3. according to the accumulative formation water rate of single gas well, determine that the accumulative of single gas well returns discharge opeing output:
FB p＝F p-W p；
In formula, F pfor the accumulative Liquid output of single gas well, FB pfor the accumulative of single gas well returns discharge opeing output, W pfor the accumulative formation water rate of single gas well;
3) according to the accumulative output returning discharge opeing and formation water of each single gas well, the formation returning discharge opeing and formation water of single gas well and the formation returning discharge opeing and formation water of whole district's Fractured Gas Wells is determined:
In formula, RFB single gas welldischarge opeing ratio is returned, ∑ FB for single gas well pfor the accumulative of whole district's Fractured Gas Wells returns discharge opeing output sum, ∑ F pfor the accumulative Liquid output sum of whole district's Fractured Gas Wells, RFB the whole districtfor the whole district returns discharge opeing ratio;
4) according to single gas well return discharge opeing ratio and the whole district returns discharge opeing ratio, and then the formation returning discharge opeing and formation water of confirmation form gas well and whole district's Fractured Gas Wells.
In above-described embodiment, for the gas well producing formation water, its production fluid curve is decline stable type substantially, and chloride content curve is in stable type of obviously rising.Reflect gas testing initial stage gas well and return discharge opeing to produce, along with the rising of chloride content, progressively transition is for producing formation water.
Below by a specific embodiment, further illustrate technique effect of the present invention.
Embodiment
Use in Liu Yang fort too 2 gas reservoir water output mechanism researchs, application result is as follows:
1) as illustrated in figures 3-6, first draw the gas testing curve of gas well A (determining Bei26Jing) and B (determining Bei10Jing) in conjunction with on-the-spot gas testing dynamic data, the variation tendency according to the gas testing curve of gas well A and gas well B judges production fluid type;
As shown in Figure 3, high (the day production fluid >100m of A well gas testing curve initial stage production fluid 3/ d), production fluid declines rapidly subsequently, and (within 1 week, production fluid reduces to <5m day 3/ d), after one-month period, stablize day production fluid reduce to 0m 3/ d.Illustrate that this well returns discharge opeing to produce substantially, not containing formation water.
As shown in Figure 4,5, in B well gas testing curve, production fluid curve is for typically declining stable type, chloride content curve in stable type of obviously rising, production fluid curve and chloride content correlation obvious.Adding up this well gas testing day at initial stage production fluid is 37m 3/ d, chloride content are 6300mg/L; Along with gas testing time lengthening, it is 3.6m that the later stage stablizes day production fluid 3/ d, stabilized chlorine radical content are 20000mg/L.Illustrate that this well gas testing initial stage returns discharge opeing to produce, along with chloride content raises, it is main for being progressively transitioned into and producing formation water.
2) because the production fluid type of A well is only for returning discharge opeing, the formation of this Fractured Gas Wells can therefore directly be determined.And the production fluid type of B well is for returning discharge opeing and formation water, therefore the gas testing stage Drawing of Curve B well chloride content according to B well and Liquid output dependency relation figure (as shown in Figure 6) is needed, and by chloride content standardization, carry out the differentiation returning discharge opeing and formation water formation of B well.Wherein, the production fluid curve of B well is decline stable type substantially as seen from Figure 6, and chloride content is in stable type of obviously rising, and the initial stage produces and returns discharge opeing is main, and along with chloride content raises, progressively formation water is produced in transition.And by the analysis of stratum well, find that the chloride content of the gas well of all product formation waters and Liquid output relation all meet Fig. 2 pattern.
3) differentiation returning discharge opeing and formation water formation of B well is carried out:
1. return discharge opeing and chlorine root graph of a relation according to B well, max (Cl)=19497mg/L, min (Cl)=6300mg/L, W can be determined dp=3.6m 3/ d;
2. by chloride content standardization, the accumulative formation water rate of B well is determined:
W p = W d p &Sigma; i = 1 n C 1 i - m i n ( C 1 ) m a x ( C 1 ) - min ( C 1 ) = 98.6 m 3 / d ;
3. according to accumulative formation water rate, determine to add up to return discharge opeing output:
FB p＝F p-W p＝424.0-98.6＝325.4m 3/d；
4. returns discharge opeing output according to accumulative, determines to return discharge opeing ratio in single gas well:
R F B = FB p F p &times; 100 % = 325.4 424.0 &times; 100 % = 76.745 % ;
5. according to returning discharge opeing ratio, confirm that B well production fluid forms (as shown in Figure 7); Return discharge opeing in B well production water and account for 76.75%, formation water accounts for 23.26%.
4) formation (as shown in Figure 8) of discharge opeing and formation water is returned in the Liu Yang fort determining B well place too 2 gas reservoir whole district Fractured Gas Wells:
As shown in table 2, from result of calculation, return discharge opeing ratio higher in local area gas well production water, returning discharge opeing ratio in whole district's production water is 76.8%, and formation water ratio is less, average out to 23.2%.
Table 2
The various embodiments described above are only for illustration of the present invention, and wherein the structure, connected mode etc. of each parts all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.

Claims (2)

1. Fractured Gas Wells returns the method for discrimination that discharge opeing and formation water are formed, and it is characterized in that:
1) according to the on-the-spot gas testing dynamic data of each single gas well in whole district's Fractured Gas Wells in district to be measured, draw the gas testing curve of each single gas well, judge the production fluid type of each single gas well according to the variation tendency of the gas testing curve of each single gas well; The production fluid type of single gas well comprises two kinds of situations, and one only produces to return discharge opeing, and another kind produces to return discharge opeing and formation water;
2) the production fluid formation of single gas well is differentiated:
When the production fluid type of single gas well returns discharge opeing for only producing, the production fluid formation that directly can determine this Fractured Gas Wells is all return discharge opeing;
When the production fluid type of single gas well is for returning discharge opeing and formation water, set up the relation schema figure of single gas well chloride content and Liquid output according to the gas testing curve of single gas well, by chloride content standardization, the production fluid returning discharge opeing and formation water carrying out single gas well forms and differentiates:
1. according to the relation schema figure of single gas well chloride content and Liquid output, determine the minimum value min (Cl) of the maximum value max (Cl) of the chloride content of gas testing stage single gas well, chloride content, chloride content Cli under arbitrary time, stablize water yield per day W dpwith accumulative Liquid output F p;
2. by chloride content standardized method, the accumulative formation water rate of single gas well is determined:
W p = W d p &Sigma; i = 1 n C 1 i - m i n ( C 1 ) m a x ( C 1 ) - m i n ( C 1 ) ;
In formula, W pfor the accumulative formation water rate of single gas well, the chloride content that Cli is single gas well liquid loading date when being i, min (Cl) represents the minimum value of the chloride content of single gas well, the maximum value that max (Cl) is the chloride content of single gas well; W dpfor the stable water yield per day of single gas well;
3. according to the accumulative formation water rate of single gas well, determine that the accumulative of single gas well returns discharge opeing output:
FB p＝F p-W p；
In formula, F pfor the accumulative Liquid output of single gas well, FB pfor the accumulative of single gas well returns discharge opeing output, W pfor the accumulative formation water rate of single gas well;
3) according to the accumulative output returning discharge opeing and formation water of each single gas well, the formation returning discharge opeing and formation water of single gas well and the formation returning discharge opeing and formation water of whole district's Fractured Gas Wells is determined:
In formula, RFB single gas welldischarge opeing ratio is returned, ∑ FB for single gas well pfor the accumulative of whole district's Fractured Gas Wells returns discharge opeing output sum, ∑ F pfor the accumulative Liquid output sum of whole district's Fractured Gas Wells, RFB the whole districtfor the whole district returns discharge opeing ratio;
4) according to single gas well return discharge opeing ratio and the whole district returns discharge opeing ratio, and then the formation returning discharge opeing and formation water of confirmation form gas well and whole district's Fractured Gas Wells.
2. a kind of Fractured Gas Wells as claimed in claim 1 returns the method for discrimination that discharge opeing and formation water are formed, it is characterized in that: the relation schema figure carrying out the chloride content and Liquid output that return discharge opeing and the differentiation of formation water formation of single gas well is, when only product returns discharge opeing, in the production fluid curve short time, drop to 0 rapidly; When product returns discharge opeing and formation water, production fluid curve is decline stable type, and chloride content curve is rising stable type, namely represents that gas testing initial stage gas well returns discharge opeing to produce, and along with the rising of chloride content, progressively transition is for producing formation water.
CN201510677082.8A 2015-10-19 2015-10-19 A kind of Fractured Gas Wells return the method for discrimination that discharge opeing is formed with stratum water Expired - Fee Related CN105221134B (en)

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CN114109336B (en) * 2021-11-25 2022-09-30 中国地质大学（武汉） Method for calculating flowback rate of fracturing fluid based on hydrogen stable isotope

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