CN104975852B - The diagnostic method of multistage frac water horizontal well oil-producing gas position and system thereof - Google Patents

Abstract

The invention discloses the diagnostic method of a kind of multistage frac water horizontal well oil-producing (gas) position, comprise the following steps: measure multistage frac water horizontal well bottom pressure within closing well a period of time, obtain the variation relation of bottom pressure difference and time; The initial parameter of pressure monitoring interpretation model is determined according to well logging and well completion data; Judge that whether variation relation is equal with preset relation, if equal, then carry out next step, if unequal, then revise the calculation of pressure parameter that preset relation is corresponding, until equal, the actual pressure obtaining multistage frac water horizontal well calculates parameter, to control the exploitation of oil-gas reservoir. The invention also discloses a kind of diagnostic system, including multistage frac water horizontal well pressure measurement cell, judging unit, calculation of pressure parameter processing unit, pressure monitoring control unit, well logging and well completion data processing unit and memory element. The method and system consider each crack oil-producing or the uneven impact of aerogenesis, in order to formulate well stimulation targetedly.

Description

The diagnostic method of multistage frac water horizontal well oil-producing gas position and system thereof

Technical field

The invention belongs to Reservoir Development technical field, be specifically related to diagnostic method and the system thereof of a kind of multistage frac water horizontal well oil-producing gas position.

Background technology

Multistage frac water horizontal well has important strategic importance and economic benefit in increasing recoverable reserves, improving well yield, exploitation reducig cost and complex reservoir exploitation etc., and therefore the pressure monitoring of multistage frac water horizontal well, effect assessment and storey increase design etc. have become the hot issue in current oil-gas reservoir exploitation field. Pressure monitoring is a kind of technology understanding stratum characteristic in Modern Reservoir development process.

In actual production, oil production or the gas production of each crack of multistage frac water horizontal well are uneven, or only have partial fracture oil-producing or aerogenesis, and the oil production in other cracks or gas production are almost nil. Cause that the reason that above-mentioned situation occurs is as follows: the anisotropism of reservoir; Drop in formation pressure, crack re-closes; Fracturing fluid is counter to be arranged insufficient, makes crack block; Other pollution factors etc.

At present, the well-logging method of multistage frac water horizontal well is all to put into production as foundation with whole fracturing section, explains that partial fracture not oil-producing or anaerogenic multistage frac water horizontal well will cause explaining parameter (permeability of formation, skin factor S etc.) distortion according to traditional Well Test Data Analysis Method. Traditional Well Test Data Analysis Method assumes that the flow of each crack is equal and is not zero, this hypothesis (only partial fracture oil-producing or aerogenesis even with the mass flow discrepancy of each crack in actual production; The equal oil-producing in whole cracks or aerogenesis, but the oil production of each crack or gas production are unequal) multistage frac water horizontal well on nowed forming, have very big-difference, can not the fluid flow state of the oil production of each crack of accurate description or the uneven multistage frac water horizontal well of gas production, therefore it is badly in need of developing the diagnostic method of a kind of multistage frac water horizontal well oil-producing gas position and system thereof, to adapt to monitoring and the control of each crack oil production or the uneven multistage frac water horizontal well of gas production.

The patent of invention that Authorization Notice No. is CN101560879B discloses a kind of well test analysis method for low permeability gas reservoir, comprises the steps: to measure gas well in the bottom pressure value driven a well in a period of time, obtains the relation value of pressure differential and time; Judge that whether relation value is equal with preset relation value, if equal, then carry out next step, otherwise revise the well test analysis parameter that preset relation value is corresponding; Using the well test analysis parameter corresponding for the preset relation value well test analysis parameter as gas well; The gas flow situation of well test analysis this gas well of Parameter analysis according to gas well, to control gas well exploitation. This patent of invention also discloses a kind of well test analysis and controls system, including gas well pressure measurement cell, judging unit, well test analysis parameter processing unit and well test analysis control unit. Although the well test analysis method of this patent of invention and system can describe the gas flow state of gas reservoir, but also cannot meet the requirement that this well test analysis is consistent with the actual seepage flow situation of gas reservoir.

The patent of invention that application publication number is CN104612658A discloses a kind of well test analysis control method for horizontal well in segments production fluid identification, the step of the method is identical with the step of foregoing invention patent, and only preset relation value is different from the relational expression of corresponding well test analysis parameter. This patent of invention also discloses a kind of well test analysis and controls system, identical with the system of foregoing invention patent. This patent of invention cannot meet the requirement that well test analysis is consistent with the actual seepage flow situation of oil reservoir equally.

Summary of the invention

For solving problems of the prior art, the present invention provides the diagnostic method of a kind of multistage frac water horizontal well oil-producing gas position, its object is to: by Low permeable oil and gas reservoirs multistage frac water horizontal well is carried out pressure monitoring, to realize each crack oil production or the Precise Diagnosis of the uneven multistage frac water horizontal well oil-producing of gas production or aerogenesis position, provide foundation for formulating storey increase design measure targetedly.

For achieving the above object, the technical solution used in the present invention is: the diagnostic method of a kind of multistage frac water horizontal well oil-producing gas position, and it comprises the following steps according to sequencing:

Step one: measure multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time;

Step 2: determine the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time according to the well logging of multistage frac water horizontal well and well completion data;

Step 3: relatively and judge bottom pressure difference whether equal with preset relation with the variation relation of time;

Step 4: if bottom pressure difference equal with preset relation with the variation relation of time, then using the calculation of pressure parameter corresponding to preset relation as multistage frac water horizontal well actual pressure calculating parameter; If bottom pressure difference is unequal with the variation relation of time and preset relation, then the calculation of pressure parameter corresponding to preset relation being modified, until the two is equal, the actual pressure obtaining multistage frac water horizontal well calculates parameter;

Step 5: calculate the petrol-gas permeation fluid situation of this well of Parameter analysis according to the actual pressure of multistage frac water horizontal well, to instruct and to control the exploitation of oil-gas reservoir.

Pressure monitoring usually utilizes pressure monitoring interpretation model to be fitted with actual test data, again through corresponding inverse operation, obtains each item data of the calculation of pressure parameter of actual formation.The present invention, has initially set up the pressure monitoring interpretation model of multistage frac water horizontal well under the crack limited fluid diversion ability of considering, well bore storage effect, skin factor and the impact of the composite factor such as pit shaft oil-producing or aerogenesis, then solve, top underseal is closed, the infinitely-great oil-gas reservoir of horizontal direction, according to image theory, run through and be perpendicular to the wall scroll crack of whole oil-gas Layer and be considered as the band source of infinite space, multiple band sources superposition, multistage fracturing horizontal well source can be obtained solve, the line-source solution of infinite space is obtained by the point source solution integration of infinite space, the band source solution of infinite space is obtained again by the line-source solution integration of infinite space, the pressure drop of multistage fracturing horizontal well any point in the earth formation can be obtained by the superposition in multiple band sources, the pressure solution matching tried to achieve is utilized to explain actual pressure data, reverse explains parameter. such as, pressure solution (bottom pressure difference and the variation relation of time) and respective derivative are drawn as curve under corresponding coordinate, the pressure variation of all kinds of oil-gas reservoir can be obtained, i.e. pressure monitoring interpretation chart, using this pressure monitoring interpretation chart as pressure monitoring interpretation model, namely can be used to matching and explain actual pressure Monitoring Data, try to achieve actual pressure and calculate parameter.

Step one, measure multistage frac water horizontal well bottom pressure within closing well a period of time, the parameters of multistage frac water horizontal well is obtained according to this bottom pressure, to diagnose effective oil-producing or the aerogenesis crack of actual multistage frac water horizontal well, and it is evaluated, thus formulate well stimulation targetedly. Prior art generally adopts the mode of curve matching, but the pressure monitoring interpretation model that prior art is used for matching actual multistage frac water horizontal well data is all left out each crack oil-producing or the uneven impact of aerogenesis, therefore fitting result (the explanation parameter of multistage frac water horizontal well) differs bigger with actual parameter, it is impossible to the true practical situation reflecting this well. And present invention employs and consider that these well data are fitted by multistage frac water horizontal well each crack oil-producing or the uneven pressure monitoring interpretation model of aerogenesis, therefore explain the explanation parameter closer to practical condition.

Step 2, first pass through well logging and well completion data determines the initial parameter of pressure monitoring interpretation model, then further according to the preset relation of Initial parameter sets bottom pressure difference with time, therefore provide reference frame for the setting of preset relation, make preset relation closer to practical situation, zero deflection, thus having established good basis for follow-up comparison and judgement, reduce and revise number of times, improve production efficiency, reduce cost. Additionally, well logging and pressure monitoring are parallel analysis means, well logging result and pressure monitoring result being compared, conventional parameter differs minimum, and the pressure monitoring of the present invention considers multistage frac water horizontal well each crack oil-producing or the uneven impact of aerogenesis.

Step 3, is described the actual change relation of the bottom pressure of multistage frac water horizontal well difference with time by curve form, preset relation is described also by curve form, then is contrasted by two curves. Owing to preset relation curve corresponding pressure monitors interpretation model, namely the mathematical equation of several calculation of pressure parameters is contained, therefore regulating this preset relation curve so that when it overlaps with actual change relation curve, the numerical value of this calculation of pressure parameter corresponding to preset relation curve also correspondingly changes, namely this process is the process of matching, is also the process revising calculation of pressure parameter. The preset relation curve overlapped with actual change relation curve is obtained by matching, this calculation of pressure parameter corresponding to preset relation curve as the calculation of pressure parameter of actual change relation curve, can thus obtain the actual pressure of multistage frac water horizontal well and calculate parameter. The present invention is by the oil-producing of multistage frac water horizontal well or the oil production of aerogenesis Number of Fractures and each crack or the new parameter introducing pressure monitoring interpretation model of this two class of gas production, multistage frac water horizontal well data are explained according to this pressure monitoring interpretation model matching, the actual pressure obtained calculates parameter and more meets actual formation situation, effective oil-producing of actual multistage frac water horizontal well or the condition of production in aerogenesis crack location and each bar oil-producing or aerogenesis crack can be gone out by Accurate Diagnosis, thus formulating well stimulation targetedly.

Step 4, when the bottom pressure difference of multistage frac water horizontal well is unequal with the variation relation of time and preset relation, when namely two relation curves are misaligned, adjusts preset relation curve so that it is overlap with actual change relation curve.

Step 5, actual pressure according to multistage frac water horizontal well calculates the oil-producing of the Parameter analysis each crack of this well or the pollution condition etc. of aerogenesis situation and each crack, to formulate storey increase design measure targetedly, instruct and control the exploitation of this well oil-gas reservoir more accurately.

Preferably, for oil reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}p=p_i-p_{wfj}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\frac{q_o\left(i\right)\·B_o}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[\left(j-i\right)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_o\left(j\right)\·B_o{\mathrm{\μ}}_o}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{{\mathrm{dp}}_{wfj}}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_o}{\[r\frac{\∂p}{\∂r}\]}_{r=r_w}=q_o{B}_o$

In formula, �� p bottom pressure is poor, atm;

The bottom pressure of p multistage frac water horizontal well, atm;

p_iOriginal formation pressure, atm;

p_wfjThe bottom pressure of j-th strip crack and horizontal wellbore junction, atm;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_oIn-place oil viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_oThe yield of multistage pressure break horizontal oil, cm³/ s;

q_oThe yield of (i) multistage pressure break horizontal oil the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H core intersection, cm;

S_jThe skin factor of jth net horizontal section, zero dimension;

B_oThe volume factor of crude oil, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s.

In any of the above-described scheme preferably, described calculation of pressure parameter includes the oil production of each crack of multistage frac water horizontal well, the skin factor of each crack and in-place permeability.

Preferably, for gas reservoir in any of the above-described scheme, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}\mathrm{\ψ}\left(p\right)=\mathrm{\ψ}\left(p_i\right)-\mathrm{\ψ}\left(p_{wfj}\right)=\underset{i=1}{\overset{N}{\Σ}}\frac{q_g\left(i\right)\·B_g}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_g\left(j\right)\·B_g{\mathrm{\μ}}_g}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{d\mathrm{\ψ}\left(p_{wfj}\right)}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_g}{\[r\frac{\∂\mathrm{\ψ}\left(p\right)}{\∂r}\]}_{r=r_w}=q_g{B}_g$

In formula, �� �� (p) shaft bottom pseudopressure is poor, atm²/ cp;

The shaft bottom pseudopressure of �� (p) multistage frac water horizontal well, atm;

��(p_i) initial pseudopressure, atm²/ cp;

��(p_wfj) the shaft bottom pseudopressure of j-th strip crack and horizontal wellbore junction, atm²/ cp;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_gFormation gas viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_gMultistage frac water horizontal well gas well yield, cm³/ s;

q_gThe yield of (i) multistage frac water horizontal well gas well the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H gas pay thickness, cm;

S_jThe skin factor of jth net horizontal section, zero dimension;

B_gThe volume factor of gas, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s.

In any of the above-described scheme preferably, described calculation of pressure parameter includes the gas production of each crack of multistage frac water horizontal well, the skin factor of each crack and in-place permeability.

In any of the above-described scheme preferably, described variation relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

In any of the above-described scheme preferably, described preset relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

The present invention also provides for the diagnostic system of a kind of multistage frac water horizontal well oil-producing gas position, can be used for any of the above-described kind of diagnostic method, and it includes with lower unit:

Multistage frac water horizontal well pressure measurement cell, for measuring multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time, i.e. pressure solution;Variation relation includes the derivative of the bottom pressure difference variation relation with the time and bottom pressure difference and the variation relation of time.

Judging unit, whether the bottom pressure difference for judging multistage frac water horizontal well is equal with preset relation with the variation relation of time;

Calculation of pressure parameter processing unit, processes the calculation of pressure parameter corresponding to preset relation accordingly for the judged result made according to judging unit, and the actual pressure obtaining multistage frac water horizontal well calculates parameter;

Pressure monitoring control unit, actual pressure for processing the multistage frac water horizontal well obtained according to calculation of pressure parameter processing unit calculates the petrol-gas permeation fluid situation of this well of parameter diagnosis, i.e. oil production or the more crack location of gas production and oil production or the less crack location of gas production, to instruct and to control the exploitation of oil-gas reservoir;

Also include well logging and well completion data processing unit, for processing well logging and the well completion data of multistage frac water horizontal well, the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time is determined according to well logging and well completion data. First pass through well logging and well completion data processing unit determines the initial parameter of pressure monitoring interpretation model, then further according to the preset relation of Initial parameter sets bottom pressure difference with time, therefore the setting for preset relation provides reference frame, make preset relation closer to practical situation, zero deflection, thus having established good basis for follow-up comparison and judgement, reducing and revising number of times, improve production efficiency, reduce cost. Additionally, well logging and pressure monitoring are parallel analysis means, well logging result and pressure monitoring result being compared, conventional parameter differs minimum, and the pressure monitoring of the present invention considers multistage frac water horizontal well each crack oil-producing or the uneven impact of aerogenesis.

Preferably, described calculation of pressure parameter processing unit includes calculation of pressure parameters revision unit, for when the judged result that judging unit is made is bottom pressure difference and the variation relation of time is unequal with preset relation, revise the calculation of pressure parameter corresponding to preset relation, until the two is equal.

In any of the above-described scheme preferably, described diagnostic system also includes memory element, for storing the calculation of pressure parameter corresponding to preset relation and preset relation, so that the actual change relation that judging unit obtains according to this preset relation and multistage frac water horizontal well pressure measurement cell measurement compares judgement, and the calculation of pressure parameter corresponding to this preset relation of judged result correction, the actual pressure obtaining multistage frac water horizontal well calculates parameter.

In any of the above-described scheme preferably, described multistage frac water horizontal well pressure measurement cell is realized by measurement apparatus or oil-gas reservoir pressure measurement cell. Measurement result can be supplied to judging unit in several ways, such as website orientation, network transmission, portable unit transmission etc.

In any of the above-described scheme preferably, described judging unit and calculation of pressure parameter processing unit are realized by same management server I.

In any of the above-described scheme preferably, described pressure monitoring control unit is realized by terminal server.

In any of the above-described scheme preferably, described well logging and well completion data processing unit are by managing server II realization.

In any of the above-described scheme preferably, described memory element is realized by database server.

Preferably, for oil reservoir in any of the above-described scheme, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}p=p_i-p_{wfj}=\underset{i=1}{\overset{N}{\Σ}}\frac{q_o\left(i\right)\·B_o}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_o\left(j\right)\·B_o{\mathrm{\μ}}_o}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{{\mathrm{dp}}_{wfj}}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_o}{\[r\frac{\∂p}{\∂r}\]}_{r=r_w}=q_o{B}_o,$ In formula, symbol description is ibid.

In any of the above-described scheme preferably, described calculation of pressure parameter includes the oil production of each crack of multistage frac water horizontal well, the skin factor of each crack and in-place permeability.

Preferably, for gas reservoir in any of the above-described scheme, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}\mathrm{\ψ}\left(p\right)=\mathrm{\ψ}\left(p_i\right)-\mathrm{\ψ}\left(p_{wfj}\right)=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\frac{q_g\left(i\right)\·B_g}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[\left(j-i\right)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_g\left(j\right)\·B_g{\mathrm{\μ}}_g}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{d\mathrm{\ψ}\left(p_{wfj}\right)}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_g}{\[r\frac{\∂\mathrm{\ψ}\left(p\right)}{\∂r}\]}_{r=r_w}=q_g{B}_g,$ In formula, symbol description is ibid.

In any of the above-described scheme preferably, described calculation of pressure parameter includes the gas production of each crack of multistage frac water horizontal well, the skin factor of each crack and in-place permeability.

The diagnostic method of the multistage frac water horizontal well oil-producing gas position of the present invention and system thereof, be easily understood, easy to operate, improves production efficiency, reduces cost. Owing to considering multistage frac water horizontal well because of the uneven situation of crack closure, proppant breaks, the factor such as fracturing fluid recovery (backflow) is uneven, Reservoir Heterogeneity causes each crack oil-producing or aerogenesis, therefore, adopt the pressure monitoring that the method and system carry out multistage frac water horizontal well to explain more to tally with the actual situation, thus improve the degree of accuracy that pressure monitoring is explained, reasonable development and formulation storey increase design measure for multistage frac water horizontal well provide powerful guarantee; Relative analysis according to preset relation and actual change relation and the correction of calculation of pressure parameter, not only can explain layer parameter routinely, give new parameter, i.e. effectively the oil production in oil-producing or aerogenesis Number of Fractures, each bar oil-producing or aerogenesis crack or gas production, skin factor etc.; Also can accurate characterization multistage frac water horizontal well is actual and the mobility status of complexity, be intuitively and effectively diagnosed to be effective oil-producing of actual multistage frac water horizontal well or the position in aerogenesis crack, thus formulating storey increase design measure targetedly, convenient and practical, it is easy to popularization.

Accompanying drawing explanation

Fig. 1 is the process chart of a preferred embodiment of the diagnostic method of the multistage frac water horizontal well oil-producing gas position according to the present invention;

Fig. 2 is the structured flowchart of a preferred embodiment of the diagnostic system of the multistage frac water horizontal well oil-producing gas position according to the present invention;

Fig. 3 is the application schematic diagram of the embodiment illustrated in fig. 2 of the diagnostic system of the multistage frac water horizontal well oil-producing gas position according to the present invention;

Fig. 4 is the double-log characteristic curve relation of the multistage frac water horizontal well of the embodiment illustrated in fig. 1 of the diagnostic method of the multistage frac water horizontal well oil-producing gas position according to present invention bottom pressure difference under each crack oil-producing or the uneven situation of aerogenesis and time.

Figure labeling description: 1-measurement apparatus, 2-manages server I, 3-terminal server, 4-database server, and 5-manages server II.

Detailed description of the invention

In order to be further understood that the summary of the invention of the present invention, elaborate the present invention below in conjunction with specific embodiment.

As it is shown in figure 1, the embodiment of diagnostic method of the multistage frac water horizontal well oil-producing gas position according to the present invention, it comprises the following steps according to sequencing:

Step one: measure multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time;

Step 2: determine the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time according to the well logging of multistage frac water horizontal well and well completion data;

Step 3: relatively and judge bottom pressure difference whether equal with preset relation with the variation relation of time;

Step 4: if bottom pressure difference equal with preset relation with the variation relation of time, then using the calculation of pressure parameter corresponding to preset relation as multistage frac water horizontal well actual pressure calculating parameter; If bottom pressure difference is unequal with the variation relation of time and preset relation, then the calculation of pressure parameter corresponding to preset relation being modified, until the two is equal, the actual pressure obtaining multistage frac water horizontal well calculates parameter;

Step 5: calculate the petrol-gas permeation fluid situation of this well of Parameter analysis according to the actual pressure of multistage frac water horizontal well, to instruct and to control the exploitation of oil-gas reservoir.

The present embodiment, has initially set up the pressure monitoring interpretation model of multistage frac water horizontal well under the crack limited fluid diversion ability of considering, well bore storage effect, skin factor and the impact of the composite factor such as pit shaft oil-producing or aerogenesis, then solve, top underseal is closed, the infinitely-great oil-gas reservoir of horizontal direction, according to image theory, run through and be perpendicular to the wall scroll crack of whole oil-gas Layer and be considered as the band source of infinite space, multiple band sources superposition, multistage fracturing horizontal well source can be obtained solve, the line-source solution of infinite space is obtained by the point source solution integration of infinite space, the band source solution of infinite space is obtained again by the line-source solution integration of infinite space, the pressure drop of multistage fracturing horizontal well any point in the earth formation can be obtained by the superposition in multiple band sources, the pressure solution matching tried to achieve is utilized to explain actual pressure data, reverse explains parameter. pressure solution (bottom pressure difference and the variation relation of time) and respective derivative are drawn as curve under corresponding coordinate, the pressure variation of all kinds of oil-gas reservoir can be obtained, i.e. pressure monitoring interpretation chart, using this pressure monitoring interpretation chart as pressure monitoring interpretation model, namely can be used to matching and explain actual pressure Monitoring Data, try to achieve actual pressure and calculate parameter.

Step one, measure multistage frac water horizontal well bottom pressure within closing well a period of time, the parameters of multistage frac water horizontal well is obtained according to this bottom pressure, to diagnose effective oil-producing or the aerogenesis crack of actual multistage frac water horizontal well, and it is evaluated, thus formulate well stimulation targetedly. The present embodiment have employed and considers that these well data are fitted by multistage frac water horizontal well each crack oil-producing or the uneven pressure monitoring interpretation model of aerogenesis, therefore explains the explanation parameter closer to practical condition. Described variation relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

Step 2, first pass through well logging and well completion data determines the initial parameter of pressure monitoring interpretation model, then further according to the preset relation of Initial parameter sets bottom pressure difference with time, therefore provide reference frame for the setting of preset relation, make preset relation closer to practical situation, zero deflection, thus having established good basis for follow-up comparison and judgement, reduce and revise number of times, improve production efficiency, reduce cost. Additionally, well logging and pressure monitoring are parallel analysis means, well logging result and pressure monitoring result being compared, conventional parameter differs minimum, and the pressure monitoring of the present embodiment considers multistage frac water horizontal well each crack oil-producing or the uneven impact of aerogenesis. Described preset relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

Step 3, is described the actual change relation of the bottom pressure of multistage frac water horizontal well difference with time by curve form, preset relation is described also by curve form, then is contrasted by two curves. Owing to preset relation curve corresponding pressure monitors interpretation model, namely the mathematical equation of several calculation of pressure parameters is contained, therefore regulating this preset relation curve so that when it overlaps with actual change relation curve, the numerical value of this calculation of pressure parameter corresponding to preset relation curve also correspondingly changes, namely this process is the process of matching, is also the process revising calculation of pressure parameter. The preset relation curve overlapped with actual change relation curve is obtained by matching, this calculation of pressure parameter corresponding to preset relation curve as the calculation of pressure parameter of actual change relation curve, can thus obtain the actual pressure of multistage frac water horizontal well and calculate parameter. Described calculation of pressure parameter includes the oil production of each crack of multistage frac water horizontal well or gas production, the skin factor of each crack and in-place permeability.

Step 4, when the bottom pressure difference of multistage frac water horizontal well is unequal with the variation relation of time and preset relation, when namely two relation curves are misaligned, adjusts preset relation curve so that it is overlap with actual change relation curve.

Step 5, actual pressure according to multistage frac water horizontal well calculates the oil-producing of the Parameter analysis each crack of this well or the pollution condition etc. of aerogenesis situation and each crack, to formulate storey increase design measure targetedly, instruct and control the exploitation of this well oil-gas reservoir more accurately.

For oil reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}p=p_i-p_{wfj}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\frac{q_o\left(i\right)\·B_o}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[\left(j-i\right)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_o\left(j\right)\·B_o{\mathrm{\μ}}_o}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{{\mathrm{dp}}_{wfj}}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_o}{\[r\frac{\∂p}{\∂r}\]}_{r=r_w}=q_o{B}_o$

In formula, �� p bottom pressure is poor, atm;

The bottom pressure of p multistage frac water horizontal well, atm;

p_iOriginal formation pressure, atm;

p_wfjThe bottom pressure of j-th strip crack and horizontal wellbore junction, atm;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_oIn-place oil viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_oThe yield of multistage pressure break horizontal oil, cm³/ s;

q_oThe yield of (i) multistage pressure break horizontal oil the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H core intersection, cm;

S_jThe skin factor of jth net horizontal section, zero dimension;

B_oThe volume factor of crude oil, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s.

For gas reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}\mathrm{\ψ}\left(p\right)=\mathrm{\ψ}\left(p_i\right)-\mathrm{\ψ}\left(p_{wfj}\right)=\underset{i=1}{\overset{N}{\Σ}}\frac{q_g\left(i\right)\·B_g}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_g\left(j\right)\·B_g{\mathrm{\μ}}_g}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{d\mathrm{\ψ}\left(p_{wfj}\right)}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_g}{\[r\frac{\∂\mathrm{\ψ}\left(p\right)}{\∂r}\]}_{r=r_w}=q_g{B}_g$

In formula, �� �� (p) shaft bottom pseudopressure is poor, atm²/ cp;

The shaft bottom pseudopressure of �� (p) multistage frac water horizontal well, atm;

��(p_i) initial pseudopressure, atm²/ cp;

��(p_wfj) the shaft bottom pseudopressure of j-th strip crack and horizontal wellbore junction, atm²/ cp;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_gFormation gas viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_gMultistage frac water horizontal well gas well yield, cm³/ s;

q_gThe yield of (i) multistage frac water horizontal well gas well the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H gas pay thickness, cm;

S_jThe skin factor of jth net horizontal section, zero dimension;

B_gThe volume factor of gas, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s.

As in figure 2 it is shown, the embodiment of diagnostic system of the multistage frac water horizontal well oil-producing gas position according to the present invention, can be used for above-mentioned diagnostic method, it includes with lower unit:

Multistage frac water horizontal well pressure measurement cell, for measuring multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time, i.e. pressure solution; Variation relation includes the derivative of the bottom pressure difference variation relation with the time and bottom pressure difference and the variation relation of time.

Judging unit, whether the bottom pressure difference for judging multistage frac water horizontal well is equal with preset relation with the variation relation of time.

Calculation of pressure parameter processing unit, processes the calculation of pressure parameter corresponding to preset relation accordingly for the judged result made according to judging unit, and the actual pressure obtaining multistage frac water horizontal well calculates parameter.

Pressure monitoring control unit, actual pressure for processing the multistage frac water horizontal well obtained according to calculation of pressure parameter processing unit calculates the petrol-gas permeation fluid situation of this well of parameter diagnosis, i.e. oil production or the more crack location of gas production and oil production or the less crack location of gas production, to instruct and to control the exploitation of oil-gas reservoir.

Well logging and well completion data processing unit, for processing well logging and the well completion data of multistage frac water horizontal well, determine the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time according to well logging and well completion data. First pass through well logging and well completion data processing unit determines the initial parameter of pressure monitoring interpretation model, then further according to the preset relation of Initial parameter sets bottom pressure difference with time, therefore the setting for preset relation provides reference frame, make preset relation closer to practical situation, zero deflection, thus having established good basis for follow-up comparison and judgement, reducing and revising number of times, improve production efficiency, reduce cost. Additionally, well logging and pressure monitoring are parallel analysis means, well logging result and pressure monitoring result being compared, conventional parameter differs minimum, and the pressure monitoring of the present embodiment considers multistage frac water horizontal well each crack oil-producing or the uneven impact of aerogenesis.

Described calculation of pressure parameter processing unit includes calculation of pressure parameters revision unit, for when the judged result that judging unit is made is bottom pressure difference and the variation relation of time is unequal with preset relation, revise the calculation of pressure parameter corresponding to preset relation, until the two is equal.

Described diagnostic system also includes memory element, for storing the calculation of pressure parameter corresponding to preset relation and preset relation, so that the actual change relation that judging unit obtains according to this preset relation and multistage frac water horizontal well pressure measurement cell measurement compares judgement, and the calculation of pressure parameter corresponding to this preset relation of judged result correction, the actual pressure obtaining multistage frac water horizontal well calculates parameter. Described calculation of pressure parameter includes the oil production of each crack of multistage frac water horizontal well or gas production, the skin factor of each crack and in-place permeability.

As it is shown on figure 3, described multistage frac water horizontal well pressure measurement cell is realized by measurement apparatus 1, measurement result can be supplied to judging unit in several ways, such as website orientation, network transmission, portable unit transmission etc.Described judging unit and calculation of pressure parameter processing unit are realized by same management server I 2. Described pressure monitoring control unit is realized by terminal server 3. Described well logging and well completion data processing unit are realized by managing server II 5. Described memory element is realized by database server 4.

For oil reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}p=p_i-p_{wfj}=\underset{i=1}{\overset{N}{\Σ}}\frac{q_o\left(i\right)\·B_o}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_o\left(j\right)\·B_o{\mathrm{\μ}}_o}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{{\mathrm{dp}}_{wfj}}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_o}{\[r\frac{\∂p}{\∂r}\]}_{r=r_w}=q_o{B}_o,$ In formula, symbol description is ibid.

For gas reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}\mathrm{\ψ}\left(p\right)=\mathrm{\ψ}\left(p_i\right)-\mathrm{\ψ}\left(p_{wfj}\right)=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\frac{q_g\left(i\right)\·B_g}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[\left(j-i\right)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_g\left(j\right)\·B_g{\mathrm{\μ}}_g}{2\mathrm{\π}Kh}{S}_j$

Wherein, $-C\frac{d\mathrm{\ψ}\left(p_{wfj}\right)}{dt}+\frac{2\mathrm{\π}Kh}{{\mathrm{\μ}}_g}{\[r\frac{\∂\mathrm{\ψ}\left(p\right)}{\∂r}\]}_{r=r_w}=q_g{B}_g,$ In formula, symbol description is ibid.

For making the above embodiment of the present invention clearly, below in conjunction with concrete Application Example, the invention will be further described:

First, measure multistage frac water horizontal well bottom pressure within closing well a period of time, variation relation curve (�� p by bottom pressure difference with time, derivative curve (the �� p ' of �� t) and bottom pressure difference and the variation relation curve of time, �� t) is drawn in log-log coordinate, obtaining the double-log plate of an actual measurement, namely what this double-log plate reflected is required relation value.

Secondly, above-mentioned relation value is sent to the terminal that calculation of pressure parameter is processed or device (can be realized by server), this terminal or device extract the preset relation value prestored again from data base, and compare with the variation relation value of aforementioned multistage frac water horizontal well, this preset relation value and calculation of pressure parameter have a corresponding relation.

Then, the variation relation value of above-mentioned multistage frac water horizontal well and preset relation value are compared and judge, if the variation relation value of this multistage frac water horizontal well is equal to this preset relation value, then one group of calculation of pressure parameter that this preset relation value is corresponding is the actual pressure of this multistage frac water horizontal well and calculates parameter; If the variation relation value of this multistage frac water horizontal well is not equal to this preset relation value, then the calculation of pressure parameter that this preset relation value is corresponding being modified, until the two is equal, the actual pressure obtaining this multistage frac water horizontal well calculates parameter.

Finally, actual pressure according to the multistage frac water horizontal well obtained calculates the petrol-gas permeation fluid situation of this well of parameter diagnosis, i.e. oil production or the more crack location of gas production and oil production or the less crack location of gas production, and then instruct and control the oil-gas reservoir exploitation work of this multistage frac water horizontal well.

Wherein, the corresponding relation of preset relation value and calculation of pressure parameter is the present embodiment and considers the pressure monitoring interpretation model in part oil-producing or aerogenesis crack in multistage frac water horizontal well actual production, according to the present embodiment, can be realized by aforementioned formula.

Fig. 4 is multistage frac water horizontal well bottom pressure difference under each crack oil-producing or the uneven situation of aerogenesis and the double-log characteristic curve relation of time, monitors parameter according to this curve linear relationship and soluble actual pressure.

Wherein: P_WDFor dimensionless bottom pressure; P_WD' for the derivative of dimensionless bottom pressure; C_DFor dimensionless bottom-hole storage coefficient; t_DFor nondimensional time.

The diagnostic method of the multistage frac water horizontal well oil-producing gas position of the present embodiment and system thereof, consider multistage frac water horizontal well because of the uneven situation of crack closure, proppant breaks, the factor such as fracturing fluid recovery (backflow) is uneven, Reservoir Heterogeneity causes each crack oil-producing or aerogenesis, therefore, adopt the pressure monitoring that the method and system carry out multistage frac water horizontal well to explain more to tally with the actual situation, thus improve the degree of accuracy that pressure monitoring is explained, formulating storey increase design measure for multistage frac water horizontal well and providing powerful guarantee.

Those skilled in the art are understood that, the diagnostic method of the multistage frac water horizontal well oil-producing gas position of the present invention and system thereof include the combination in any of each several part shown by the summary of the invention of the invention described above description and detailed description of the invention part and accompanying drawing, as space is limited and for making description concisely describe one by one without by each scheme that these combinations are constituted. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (12)

1. a diagnostic method for multistage frac water horizontal well oil-producing gas position, it comprises the following steps according to sequencing:

Step one: measure multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time;

Step 2: determine the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time according to the well logging of multistage frac water horizontal well and well completion data;

Step 3: relatively and judge bottom pressure difference whether equal with preset relation with the variation relation of time;

Step 4: if bottom pressure difference equal with preset relation with the variation relation of time, then using the calculation of pressure parameter corresponding to preset relation as multistage frac water horizontal well actual pressure calculating parameter; If bottom pressure difference is unequal with the variation relation of time and preset relation, then the calculation of pressure parameter corresponding to preset relation being modified, until the two is equal, the actual pressure obtaining multistage frac water horizontal well calculates parameter;

Step 5: calculate the petrol-gas permeation fluid situation of this well of Parameter analysis according to the actual pressure of multistage frac water horizontal well, to instruct and to control the exploitation of oil-gas reservoir;

For oil reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}p=p_i-p_{wfj}=\underset{i=1}{\overset{N}{\Σ}}\frac{q_o\left(i\right)\·B_o}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_o\left(j\right)\·B_o{\mathrm{\μ}}_o}{2\mathrm{\π}Kh}{S}_j,$

Wherein,

In formula, �� p bottom pressure is poor, atm;

The bottom pressure of p multistage frac water horizontal well, atm;

p_iOriginal formation pressure, atm;

p_wfjThe bottom pressure of j-th strip crack and horizontal wellbore junction, atm;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_oIn-place oil viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_oThe yield of multistage pressure break horizontal oil, cm³/ s;

q_oThe yield of (i) multistage pressure break horizontal oil the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H core intersection, cm;

S_jThe skin factor in j-th strip crack, zero dimension;

B_oThe volume factor of crude oil, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s;

R oil well radial distance, cm;

r_wThe radius of horizontal well pit shaft, cm;

q_oThe oil production in (j) j-th strip crack, cm³/ s;

For gas reservoir, the corresponding calculation of pressure parameter of described preset relation should meet relationship below:

$\mathrm{\Δ}\mathrm{\ψ}\left(p\right)=\mathrm{\ψ}\left(p_i\right)-\mathrm{\ψ}\left(p_{wfj}\right)=\underset{i=1}{\overset{N}{\Σ}}\frac{q_g\left(i\right)\·B_g}{2x_f{\mathrm{h\φC}}_t}\·{\∫}_0^t\frac{\exp \[-\frac{{\[(j-i)d\]}^2}{4\mathrm{\η}\mathrm{\τ}}\]}{\sqrt{4\mathrm{\π}\mathrm{\η}\mathrm{\τ}}}\·erf\[\frac{x_f}{\sqrt{4\mathrm{\η}\mathrm{\τ}}}\]d\mathrm{\τ}-\frac{q_g\left(j\right)\·B_g{\mathrm{\μ}}_g}{2\mathrm{\π}Kh}{S}_j,$

Wherein,

In formula, �� �� (p) shaft bottom pseudopressure is poor, atm²/ cp;

The shaft bottom pseudopressure of �� (p) multistage frac water horizontal well, atm;

��(p_i) initial pseudopressure, atm²/ cp;

��(p_wfj) the shaft bottom pseudopressure of j-th strip crack and horizontal wellbore junction, atm²/ cp;

Distance between adjacent two cracks of d, cm;

K in-place permeability, D;

�� porosity, zero dimension;

��_gFormation gas viscosity, cP;

C_tSystem compressibility, atm^-1;

�� piezometric conductivity, D atm/cP;

q_gMultistage frac water horizontal well gas well yield, cm³/ s;

q_gThe yield of (i) multistage frac water horizontal well gas well the i-th crack, cm³/ s;

x_fThe half of crack is long, cm;

H gas pay thickness, cm;

S_jThe skin factor in j-th strip crack, zero dimension;

B_gThe volume factor of gas, zero dimension;

C bottom-hole storage coefficient, cm³/ atm;

The t time, s;

�� time variable, s;

R gas well radial distance, cm;

r_wThe radius of horizontal well pit shaft, cm;

q_gThe gas production in (j) j-th strip crack, cm³/s��

2. the diagnostic method of multistage frac water horizontal well oil-producing gas position as claimed in claim 1, it is characterised in that: described calculation of pressure parameter includes the oil and gas production of each crack of multistage frac water horizontal well, the skin factor of each crack and in-place permeability.

3. the diagnostic method of multistage frac water horizontal well oil-producing gas position as claimed in claim 1, it is characterised in that: described variation relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

4. the diagnostic method of multistage frac water horizontal well oil-producing gas position as claimed in claim 1, it is characterised in that: described preset relation includes the double-log characteristic curve relation of the dimensionless bottom pressure difference of the multistage frac water horizontal well derivative with the double-log characteristic curve relation of nondimensional time and dimensionless bottom pressure difference and nondimensional time.

5. adopting a diagnostic system for the multistage frac water horizontal well oil-producing gas position of diagnostic method according to any one of claim 1-4, it includes with lower unit:

Multistage frac water horizontal well pressure measurement cell, for measuring multistage frac water horizontal well bottom pressure within closing well a period of time, obtains the variation relation of bottom pressure difference and time;

Judging unit, whether the bottom pressure difference for judging multistage frac water horizontal well is equal with preset relation with the variation relation of time;

Calculation of pressure parameter processing unit, processes the calculation of pressure parameter corresponding to preset relation accordingly for the judged result made according to judging unit, and the actual pressure obtaining multistage frac water horizontal well calculates parameter;

Pressure monitoring control unit, the actual pressure for processing the multistage frac water horizontal well obtained according to calculation of pressure parameter processing unit calculates the petrol-gas permeation fluid situation of this well of parameter diagnosis, to instruct and to control the exploitation of oil-gas reservoir;

It is characterized in that: also include well logging and well completion data processing unit, for processing well logging and the well completion data of multistage frac water horizontal well, the initial parameter of pressure monitoring interpretation model the preset relation according to Initial parameter sets bottom pressure difference with time is determined according to well logging and well completion data.

6. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterized in that: described calculation of pressure parameter processing unit includes calculation of pressure parameters revision unit, for when the judged result that judging unit is made is bottom pressure difference and the variation relation of time is unequal with preset relation, revise the calculation of pressure parameter corresponding to preset relation, until the two is equal.

7. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterised in that: described diagnostic system also includes memory element, for storing the calculation of pressure parameter corresponding to preset relation and preset relation.

8. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterised in that: described multistage frac water horizontal well pressure measurement cell is realized by measurement apparatus or oil-gas reservoir pressure measurement cell.

9. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterised in that: described judging unit and calculation of pressure parameter processing unit are realized by same management server I.

10. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterised in that: described pressure monitoring control unit is realized by terminal server.

11. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 5, it is characterised in that: described well logging and well completion data processing unit are by managing server II realization.

12. the diagnostic system of multistage frac water horizontal well oil-producing gas position as claimed in claim 7, it is characterised in that: described memory element is realized by database server.