CN108131128A - A kind of method of determining blowing production well occurrence - Google Patents

A kind of method of determining blowing production well occurrence Download PDF

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Publication number
CN108131128A
CN108131128A CN201711378720.1A CN201711378720A CN108131128A CN 108131128 A CN108131128 A CN 108131128A CN 201711378720 A CN201711378720 A CN 201711378720A CN 108131128 A CN108131128 A CN 108131128A
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oil
stage
occurrence
equation
well
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CN201711378720.1A
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Chinese (zh)
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韩婷婷
陈叔阳
潘琳
李龙龙
周桥
李敏齐
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China University of Geosciences
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China University of Geosciences
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Priority to CN201711378720.1A priority Critical patent/CN108131128A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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

Abstract

The present invention provides a kind of method of determining blowing production well occurrence, includes the following steps：Step 1：The creation data of three phases during acquisition oil development based on creation data, builds primary relationship formula, and using primary relationship formula as fit object, obtain individual well sample equation；Step 2：Using creation data as fitting sample, Multiple Non-linear Regression Analysis is carried out to the creation data of three phases using Mathematical Statistic Analysis Method, the fit parameter values undetermined in individual well each stage are obtained, and then obtain elasticity to discharge the occurrence equation in stage, rigid water drive stage and oil-water two-phase flow stage；Step 3：To passing through the well oil production Qo of occurrence equation calculation and practical oil production q in step 2OIt carries out seeking degree of fitting RNewOperation makes degree of fitting RNewValue be infinitely close to 1, to obtain the optimal solution of C values.Advantageous effect：Oil well can be assisted in matches production scheme, to make full use of the productive potentialities of oil well, suggestions for improvement.

Description

A kind of method of determining blowing production well occurrence
Technical field
The present invention relates to field of oil field oil extraction technical field more particularly to a kind of sides of determining blowing production well occurrence Method.
Background technology
The blowing production of oil well is that oil gas is given rise to ground using the energy of oil reservoir in itself, after bringing in, shaft bottom shape Into drop of pressure, pressure wave is passed to from shaft bottom to boundary, and strata pressure continuously decreases, before the fluid and rock under high pressure conditions It is expanded with the reduction of strata pressure, fluid expansion part is pushed to shaft bottom, and rock expansion makes pore volume reduce and then arrange Go out fluid, this process is exactly that elasticity can discharge the stage.The distinguishing feature in this stage is that energy is sufficient but the time is shorter, energy It presents during reduction and significantly successively decreases, elastic instability flowing is presented in fluid in oil reservoir, shows on creation data to be initial stage oil-producing It is big to measure fall, fluctuation is big, and successively decreasing in the later stage, comparison is steady, and moisture content is generally below 35%, and the water of extraction is stratum free water, It is different from edge-bottom water in the chemically.
For big bottom water reservoir, its main feature is that reservoir properties are preferable, water oil volume ratio is more than 100, bottom water energy it is sufficient and Stablize.When elastic energy pressure difference is transmitted to boundary, the water flooding of boundary pushes oil stream to flow to shaft bottom under differential pressure action, this mistake Journey is exactly the rigid water drive stage.The feature in this stage is uniformly above pushed away for bottom water, energy stabilization, and fluid is presented water and pushes away oil in oil reservoir The single-phase steady flow of formula shows steadily constant for water yield and moisture content on creation data.
After water flooding enters shaft bottom, oil well water breakthrough, into the oil-water two-phase flow stage.This stage is characterized in that oil reservoir includes Water saturation increases, and oil saturation reduces, grease saturation degree Interface Moving, and water-oil phase flow instabilities are presented, show It is continuously decreased on creation data for oil production, water yield and moisture content growth rate significantly increase.
Fluid is different in three different stage seepage flow modes in oil reservoir, and different features, oil well are showed on creation data It is different to produce occurrence.
Carry out blowing production well occurrence analysis：First, by grasping the production status of each well, including fluid supply capacity, production Amount is successively decreased, and then grasps the development features of full oil reservoir；2nd, every mouthful of capacity of oilwell is grasped, is formulated and closed by occurrence equation The allocation of well rates scheme of reason makes full use of the productive potentialities of oil well, suggestions for improvement.In the actual production work in oil field, Reasonable working system is formulated to be of great significance.The equation proposed at present is mostly the empirical equation that the multiple oil fields of statistics obtain, and is ground Study carefully based on darcy radial fluid flow, general applicability is weaker.
Invention content
In view of this, it the embodiment provides a kind of method of determining blowing production well occurrence, carries out accordingly Oil well occurrence is analyzed, with the productive potentialities matched production scheme, make full use of oil well grasped the development features of full oil reservoir, determine oil well So as to improve development effectiveness.
The embodiment of the present invention provides a kind of method of determining blowing production well occurrence, includes the following steps：
Step 1：The creation data of three phases during acquisition oil development, the three phases are respectively elastic energy Release stage, rigid water drive stage and oil-water two-phase flow stage, the creation data include well oil output Qo, oil nozzle diameter D, Oil pressure Pt, moisture content fw and producing gas-oil ratio R based on the creation data, build primary relationship formula, and with the basis Relational expression is fit object, obtains individual well sample equation：
Qo=CD2Pt(1-fw)aRb
Wherein, a, b are fitting parameter undetermined, and C is oil nozzle constant；
Step 2：Using the creation data as fitting sample, using Mathematical Statistic Analysis Method to the production number of three phases According to Multiple Non-linear Regression Analysis is carried out, the value of fitting parameter a, the b undetermined in individual well each stage are obtained, and then obtain elastic energy The occurrence equation in release stage, rigid water drive stage and oil-water two-phase flow stage；
Step 3：To carrying out seeking degree of fitting by the well oil production Qo of occurrence equation calculation and practical oil production q0 in step 2 RNewOperation makes degree of fitting RNewValue be infinitely close to 1, to adjust oil nozzle constant C values and obtain the optimal of oil nozzle constant C values Solution；
Step 4：By step 2 and step 3, elasticity can discharge the occurrence equation in stage and be：Qo=CD2PtR0.3, oil nozzle is normal Number C values are ranging from：C ∈ [0.006,0.01]；The occurrence equation in rigid water drive stage is：Qo=CD2Pt(1-fw)0.7R-0.3, oil nozzle Constant C values are ranging from：C ∈ [0.1,0.2]；The occurrence equation in oil-water two-phase flow stage is：Qo=CD2Pt(1-fw)0.7R-0.1, oil Mouth constant C values are ranging from：C ∈ [0.02,0.06].
Further, degree of fitting RNewFor：
Wherein, n is natural number, the n of i=0,1,2,3 ....
The embodiment of the present invention also provides a kind of method of determining blowing production well occurrence, includes the following steps：
Step 1：The creation data of three phases during acquisition oil development, the three phases are respectively elastic energy Release stage, rigid water drive stage and oil-water two-phase flow stage, the creation data include well oil output Qo, oil nozzle diameter D, Oil pressure Pt, moisture content fw and producing gas-oil ratio R based on the creation data, build primary relationship formula, and with the basis Relational expression is fit object, obtains individual well sample equation：
Qo=CD2Pt(1-fw)aRb
Wherein, a, b are undetermined parameter, and C is oil nozzle constant；
Step 2：The a large amount of creation datas of acquisition, converge fit parameter values a, b in the individual well sample equation Always, with reference to the production meaning of fit parameter values a, b, using the method for parameter estimation of point estimation, the value of parameter a, b is obtained, and by This obtains the fit parameter values undetermined in individual well each stage, and then obtains elasticity and can discharge stage, rigid water drive stage and grease The occurrence equation in two phase flow stage；
Step 3：To passing through the well oil production Qo of occurrence equation calculation and practical oil production q in step 20It carries out seeking degree of fitting RNewOperation makes degree of fitting RNewValue be infinitely close to 1, to adjust oil nozzle constant C values and obtain the optimal of oil nozzle constant C values Solution；
Step 4：By step 2 and step 3, elasticity can discharge the occurrence equation in stage and be：Qo=CD2PtR0.3, oil nozzle is normal Number C values are ranging from：C ∈ [0.006,0.01]；The occurrence equation in rigid water drive stage is：Qo=CD2Pt(1-fw)0.7R-0.3, oil nozzle Constant C values are ranging from：C ∈ [0.1,0.2]；The occurrence equation in oil-water two-phase flow stage is：Qo=CD2Pt(1-fw)0.7R-0.1, oil Mouth constant C values are ranging from：C ∈ [0.02,0.06].
The advantageous effect brought of technical solution that the embodiment of the present invention provides is：Utilize determining blowing of the present invention The occurrence equation that the method for production well occurrence determines carries out oil well occurrence analysis, and the exploitation that can not only grasp full oil reservoir is special Sign, but also can according to the development features of full oil reservoir come determine oil well with production scheme, dived with the production for making full use of oil well Power, so as to improve development effectiveness.
Description of the drawings
Fig. 1 be the actually measured individual well daily oil production of the present invention, water yield per day, moisture content, daily fluid production rate, daily output tolerance, The exploitation curve graph that oil nozzle diameter, oil pressure, casing pressure change over time；
Fig. 2 is the contrast curve of practical oil production-calculating well oil output that the data in table 1 are depicted as；
Fig. 3 is practical oil production-calculating well oil output contrast curve that the data in table 2 are depicted as；
Fig. 4 is practical oil pressure-calculating oil pressure contrast curve that the data in table 2 are depicted as.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention Formula is further described.
The embodiment provides a kind of method of determining blowing production well occurrence, for blowing production well Carry out occurrence analysis, to grasp the development features of full oil reservoir, and then determine oil well with production scheme, to make full use of the life of oil well Potentiality are produced, so as to improve development effectiveness.Include the following steps：
Step 1：The creation data of three phases during acquisition oil development, the three phases are respectively elastic energy Release stage, rigid water drive stage and oil-water two-phase flow stage, the creation data include well oil output Qo, oil nozzle diameter D, Oil pressure Pt, moisture content fwWith producing gas-oil ratio R, based on the creation data, primary relationship formula is built, and with the basis Relational expression is fit object, obtains individual well sample equation：
Qo=CD2Pt(1-fw)aRb
Wherein, a, b are fitting parameter undetermined, and C is oil nozzle constant.
In above-mentioned steps 1, acquire the daily oil production of oil well, water yield per day, moisture content, daily fluid production rate, daily output tolerance, The exploitation curve data that oil nozzle diameter, oil pressure and casing pressure change over time, the variations such as analysis oil production, water yield, moisture content become Gesture, and Decline type differentiation, WATER FLOODING CHARACTERISTIC CURVE research, oil well water breakthrough time judging result are combined, the oil development stage is drawn Stage, rigid water drive stage, oil-water two-phase flow stage can be discharged by being divided into elasticity, as shown in Figure 1.
Then the creation data in above three stage is acquired, by the analysis to a large amount of creation data, structure is not Data relationship between the same creation data, and obtain the primary relationship formula.
In first embodiment, step 2 is：Using the creation data as fitting sample, Mathematical Statistics Analysis side is utilized Method carries out Multiple Non-linear Regression Analysis to the creation data of three phases, obtains the fitting parameter undetermined in individual well each stage Value, the i.e. value of a, b, and then obtain the elastic occurrence equation that can discharge stage, rigid water drive stage and oil-water two-phase flow stage.
Specifically, elasticity can discharge the occurrence equation in stage and be：
Qo=CD2PtR0.3 [1]。
The occurrence equation in rigid water drive stage is：
Qo=CD2Pt(1-fw)0.7R-0.3 [2]。
The occurrence equation in oil-water two-phase flow stage is：
Qo=CD2Pt(1-fw)0.7R-0.1 [3]。
In step 2 above, with a large amount of different well oil output Q in step 1oWith corresponding oil nozzle diameter D, Oil pressure Pt, moisture content fwIt is fitting sample with producing gas-oil ratio R, with reference to the individual well sample equation, utilizes Mathematical Statistics Analysis side Method carries out Multiple Non-linear Regression Analysis to the creation data in multiple stages of oil well, so as to obtain the undetermined parameter of oil well Value.
In second embodiment, step 2 is：The a large amount of creation datas of acquisition, in the individual well sample equation Fit parameter values a, b are summarized, and with reference to the production meaning of fit parameter values a, b, using the method for parameter estimation of point estimation, are obtained To the value of fitting parameter a, b, and the fit parameter values undetermined in individual well each stage are thus obtained, and then obtain elasticity to discharge rank The occurrence equation of section, rigid water drive stage and oil-water two-phase flow stage.
In the step 2 in second embodiment, each group of well oil output Q in the individual well sample equationo, oil nozzle Diameter D, oil pressure Pt, moisture content fwWith producing gas-oil ratio R, the value of one group of fit parameter values a, b are corresponded to, to a large amount of productions Data are fitted, while the fit parameter values a in the individual well sample equation, and b is summarized, with reference to fit parameter values a, The production meaning of b, using the method for parameter estimation of point estimation, you can obtain the value of parameter a, b, the parameter Estimation of the point estimation Method is the moment estimation method of K Pearson or the maximum Likelihood of RA Fisher.
Step 3：To the well oil production Q by occurrence equation calculation in step 2oWith practical oil production q0It carries out seeking degree of fitting RNewOperation makes degree of fitting RNewValue be infinitely close to 1, to obtain the optimal solution of oil nozzle constant C values, degree of fitting RNewFor：
Wherein, n is natural number, the n of i=0,1,2,3 ....
In above-mentioned steps 3, in order to ensure the accuracy of the occurrence equation described in step 2, make calculating oil well output Qo Infinite approach is even equal to practical oil production q0, so as to make the occurrence equation that there is referential and directiveness, it is thus necessary to determine that oil Well constant C.The present invention uses the practical oil production q in each stage0With the oil well output Q on the other sideoBetween plan Right RNewTo judge the practical oil production q0With the oil well output Q on the other sideoCorrelation, degree of fitting RNewValue is got over Close to 1, the oil well output QoWith practical oil production q0Between correlation it is higher, degree of agreement is higher, the occurrence equation Confidence level it is higher.With degree of fitting RNewAs criterion, oil nozzle constant C values are adjusted, make RNewValue be infinitely close to 1, To obtain the optimal solution of C values.
Count i different practical oil production q0With i oil well output Q on the other sideoOne-to-one C values, with reference to C The production meaning of value, so as to obtain the value range of oil nozzle constant C.
In the present invention, elasticity can discharge the oil nozzle constant C values in stage ranging from：C ∈ [0.006,0.01]；Rigid water drive rank The oil nozzle constant C values of section are ranging from：C ∈ [0.1,0.2]；The oil nozzle constant C values in oil-water two-phase flow stage are ranging from：C∈ [0.02,0.06].
Above-mentioned occurrence equation is verified using relative error δ, relative error δ values are closer to 0, then result of calculation is closer Actual value, confidence level is higher, and variable is also more accurate.In relative error δ≤15%, oil well production occurrence meets general rule Rule, the oil production verification of data oil well daily oil production with calculating and the tired oil production in oil well any time period, in block The tired oil production of oil well adds up, and verification block tires out production situation.For the point of relative error δ >=15%, if only individual data Point, it is believed that error larger point when being actual metered should give and ignore processing.
By taking producing well X in practice as an example, creation data is as shown in table 1：
1 X well creation data tables of table
Fig. 2 is the practical oil production q that the data in table 1 are depicted as0- well oil output QoContrast curve.
As can be seen that relative error δ is substantially in≤15% from table 1 and Fig. 2, practical oil production q0And oil well output QoBetween error in the allowed band of error, so as to demonstrate occurrence equation of the present invention there is practical guidance to anticipate Justice.
Oil nozzle is flow regulator important in oil well production, and the choke size for determining blowing producing well is important in production Link.It, can be with reference to oil nozzle diameter and yield and the relational expression of oil pressure [4] and [5] according to occurrence equation [1], [2], [3] It determines to put forward the oil nozzle diameter and oil pressure size in the case of production or drop production, and predicts the parameters such as moisture content, production gas-oil ratio Variation.
Such as at present with oil nozzle D1The oil well output of the oil well X of blowing will improve 0.5 times, current production rate Q1, it is assumed that propose production Yield afterwards is Q2, then carry the oil nozzle D in postpartum2：
Carry the oil pressure P in postpartumt2：
Oil pressure Pt2For current oil pressure.
Assuming that carrying postpartum is averaged that producing gas-oil ratio R is constant, and oil well production is in the oil-water two-phase flow stage, according to formula [3], Then carry the moisture content f in postpartumwFor：
With reference to Fig. 3 and Fig. 4, by prediction occurrence and the real attitude contrast table (table 2) of beaming up, further to verify this The invention occurrence equation：
2 X1 of table-X10 wells, which are beamed up, predicts occurrence and real attitude contrast table
The advantageous effect brought of technical solution that the embodiment of the present invention provides is：Utilize determining blowing of the present invention The occurrence equation that the method for production well occurrence determines carries out oil well occurrence analysis, and the exploitation that can not only grasp full oil reservoir is special Sign, but also can according to the development features of full oil reservoir come determine oil well with production scheme, dived with the production for making full use of oil well Power, so as to improve development effectiveness.
Herein, the involved nouns of locality such as forward and backward, upper and lower are to be located in figure with parts in attached drawing and zero Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality Use should not limit the claimed range of the application.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.

Claims (3)

  1. A kind of 1. method of determining blowing production well occurrence, it is characterised in that：Include the following steps：
    Step 1：The creation data of three phases during acquisition oil development, the three phases are respectively that elasticity can discharge Stage, rigid water drive stage and oil-water two-phase flow stage, the creation data include well oil output Qo, oil nozzle diameter D, oil pressure Pt, moisture content fw and producing gas-oil ratio R based on the creation data, build primary relationship formula, and with the primary relationship Formula is fit object, obtains individual well sample equation：
    Qo=CD2Pt(1-fw)aRb
    Wherein, a, b are fitting parameter undetermined, and C is oil nozzle constant；
    Step 2：Using the creation data as fitting sample, using Mathematical Statistic Analysis Method to the creation datas of three phases into Row Multiple Non-linear Regression Analysis obtains the value of fitting parameter a, the b undetermined in individual well each stage, so obtain elasticity can discharge The occurrence equation in stage, rigid water drive stage and oil-water two-phase flow stage；
    Step 3：To passing through the well oil production Qo of occurrence equation calculation and practical oil production q in step 20It carries out seeking degree of fitting RNewFortune It calculates, makes degree of fitting RNewValue be infinitely close to 1, to adjust oil nozzle constant C values and obtain the optimal solution of oil nozzle constant C values；
    Step 4：By step 2 and step 3, elasticity can discharge the occurrence equation in stage and be：Qo=CD2PtR0.3, oil nozzle constant C values Ranging from：C ∈ [0.006,0.01]；The occurrence equation in rigid water drive stage is：Qo=CD2Pt(1-fw)0.7R-0.3, oil nozzle constant C Value is ranging from：C ∈ [0.1,0.2]；The occurrence equation in oil-water two-phase flow stage is：Qo=CD2Pt(1-fw)0.7R-0.1, oil nozzle constant C values are ranging from：C ∈ [0.02,0.06].
  2. 2. the method for determining blowing production well occurrence as described in claim 1, it is characterised in that：Degree of fitting RNewFor：
    Wherein, n is natural number, the n of i=0,1,2,3 ....
  3. A kind of 3. method of determining blowing production well occurrence, it is characterised in that：Include the following steps：
    Step 1：The creation data of three phases during acquisition oil development, the three phases are respectively that elasticity can discharge Stage, rigid water drive stage and oil-water two-phase flow stage, the creation data include well oil output Qo, oil nozzle diameter D, oil pressure Pt, moisture content fw and producing gas-oil ratio R based on the creation data, build primary relationship formula, and with the primary relationship Formula is fit object, obtains individual well sample equation：
    Qo=CD2Pt(1-fw)aRb
    Wherein, a, b are undetermined parameter, and C is oil nozzle constant；
    Step 2：The a large amount of creation datas of acquisition, summarize fit parameter values a, b in the individual well sample equation, are tied The production meaning of fit parameter values a, b are closed, using the method for parameter estimation of point estimation, obtains the value of parameter a, b, and thus obtain The fit parameter values undetermined in individual well each stage, and then obtain elasticity and can discharge stage, rigid water drive stage and oil-water two-phase flow The occurrence equation in stage；
    Step 3：To passing through the well oil production Qo of occurrence equation calculation and practical oil production q in step 20It carries out seeking degree of fitting RNewFortune It calculates, makes degree of fitting RNewValue be infinitely close to 1, to adjust oil nozzle constant C values and obtain the optimal solution of oil nozzle constant C values；
    Step 4：By step 2 and step 3, elasticity can discharge the occurrence equation in stage and be：Qo=CD2PtR0.3, oil nozzle constant C values Ranging from：C ∈ [0.006,0.01]；The occurrence equation in rigid water drive stage is：Qo=CD2Pt(1-fw)0.7R-0.3, oil nozzle constant C Value is ranging from：C ∈ [0.1,0.2]；The occurrence equation in oil-water two-phase flow stage is：Qo=CD2Pt(1-fw)0.7R-0.1, oil nozzle constant C values are ranging from：C ∈ [0.02,0.06].
CN201711378720.1A 2017-12-19 2017-12-19 A kind of method of determining blowing production well occurrence Pending CN108131128A (en)

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Application publication date: 20180608