CN105673001B - A kind of carbonate rock individual well drop in formation pressure processing method - Google Patents
A kind of carbonate rock individual well drop in formation pressure processing method Download PDFInfo
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Abstract
The present invention provides a kind of carbonate rock individual well drop in formation pressure processing method, the carbonate rock individual well is volatilization oil reservoir individual well, the Reservoir type of the individual well is cave type reservoir, and the strata pressure of the individual well lower than oil reservoir saturation pressure and deaerates, the method includes 1) measuring the strata pressure of the individual well, obtain the difference of the strata pressure of the oil reservoir saturation pressure and the individual well, i.e. difference between reservoir pressure and saturation pressure；2) oil in place of the individual well is obtained；3) the secondary gas volume in the individual well is obtained according to the oil in place of the individual well；4) water injection rate needed for restoring the strata pressure of individual well to more than oil reservoir saturation pressure is obtained according to the oil production of unit pressure drop before degassing and secondary gas volume；5) individual well is filled the water.The present invention program, which can obtain, restores the strata pressure of individual well to more than oil reservoir saturation pressure required water injection rate, and is avoided that and the drowned problem of individual well occurs in the injecting process.
Description
Technical field
The present invention relates to a kind of carbonate rock individual well drop in formation pressure processing methods, more particularly to one kind is in carbonate rock
The strata pressure of individual well is lower than the method for handling individual well when its oil reservoir saturation pressure.
Background technique
Under normal conditions, most of oil field development well spacing keeps reservoir pressure using pattern flooding, gas injection, avoids in oil
It hides recovery process well pressure and is lower than oil reservoir saturation pressure, the degassing of undesirable stratum or retrograde condensation occur, and above-mentioned holding oil reservoir
The mode of pressure usually requires to carry out in the case where there is well connection.
For the individual well that reservoir is relatively isolated, especially carbonate rock volatilization oil reservoir individual well, since fracture hole is relatively isolated, nothing
When bottom water energy supplement, strata pressure Depletion Rate is very fast, after there is stratum degassing, a large amount of crude oil heavy component
Precipitation remains in fracture hole lower curtate position, and the secondary pneumatic jack formed is gathered in fracture hole high-order bit, and opening well and making production mainly produces time anger
The gas on top can not produce the crude oil for being distributed in fracture hole lower curtate position.Under normal conditions, the individual well to deaerate occur will pressure to water filling
Power is gone up to saturation pressure, and required water injection rate is all bigger, and cave type reservoir individual well, according to bore meet cavern location,
Cave form and cave scale are to determine whether be suitble to a large amount of water fillings.Small cave is developed for shaft bottom, crack hair around cave
The individual well educated is easy after full-scale water injection for individual well to be drowned, and equally, bores the individual well for meeting fracture hole lower curtate position, also can be rapid after water filling
Water logging occurs.Even from above-mentioned micro-judgment be suitble to full-scale water injection individual well, there is also water injection rate be difficult to accurately determine and
The case where the injecting process is easy to happen the problem of water logging, the drop in formation pressure for the oil reservoir individual well that volatilizees at present for carbonate rock,
It there is no mature technique complementary stratum energy method, the yield that can only leave reduces.
How to provide it is a kind of for volatilization oil reservoir carbonate rock individual well provide a kind of effective pressure reduction processing method at
For problem to be solved.
Summary of the invention
The present invention provides a kind of carbonate rock individual well drop in formation pressure processing methods, are obtained by ad hoc approach by institute
The strata pressure for stating individual well restores to more than oil reservoir saturation pressure required water injection rate, and combines specific water flooding regime, can keep away
Exempt from individual well and the problem that strata pressure process causes individual well drowned, the final raising for realizing well yield are improved with water flooding regime.
A kind of carbonate rock individual well drop in formation pressure processing method provided by the invention, the carbonate rock individual well are to wave
Hair oil hides individual well, and the Reservoir type of the individual well is cave type reservoir, and the strata pressure of the individual well is lower than oil reservoir saturation pressure
Power simultaneously deaerates, and the described method comprises the following steps:
1) strata pressure for measuring the individual well, obtains the difference of the strata pressure of the oil reservoir saturation pressure and the individual well
Value, i.e. difference between reservoir pressure and saturation pressure；
2) oil in place of the individual well is obtained；
3) the secondary gas volume in the individual well is obtained according to the oil in place of the individual well；
4) it according to the oil production of unit drop in formation pressure before degassing and the secondary gas volume, is obtained by formula 4
The water injection rate needed for restoring the individual well strata pressure to more than oil reservoir saturation pressure is obtained,
VWater filling=VIt is secondary+ b Δ P ' γ --- formula 4,
Wherein VWater fillingFor the water injection rate needed for restoring the strata pressure of the individual well to more than oil reservoir saturation pressure；VIt is secondaryFor
Secondary gas volume in the individual well；The oil production of unit pressure drop, unit m before b is degassing3；Δ P ' is to return needed for water filling
The strata pressure risen, i.e. stagnation pressure liter are greater than or equal to the difference between reservoir pressure and saturation pressure, units MPa；γ is grease volume conversion coefficient；
5) individual well is filled the water.
In the solution of the present invention, step 5) fills the water the individual well and is carried out in the following ways: daily water-injection rate
The side 300-600/day, the water injection pressure are greater than 0MPa and are less than 8MPa.
In the scheme of the application, water injection rate is calculated according to the specific pressure for restoring the strata pressure of the individual well
, those skilled in the art can according to need, selection to be restored extremely specific pressure (at least will oil reservoir saturation pressure with
On), so that the formula according to the application determines water injection rate.Certain those skilled in the art also can according to need one wheel of progress or
More wheel water fillings.
In the specific embodiment of the present invention, after step 4) obtains the water injection rate and step 5) is right
Before individual well is filled the water, those skilled in the art, which can according to need, meets cave position to the brill of the target individual well of cave type reservoir
It sets, the form in cave and cave scale are to determine whether be suitble to fairly large water filling.For example, directly boring the individual well for meeting cave
(having emptying, severe leakage) can meet fracture hole according to the seismic wave inside story wave impedance attribute section of drilling trajectory to bore from judgement
Position, if bore meet reservoir high-order bit be suitble to full-scale water injection, bore meet reservoir lower curtate position, then be unable to full-scale water injection；It bores
Well is not vented leakage, but when acid fracturing curve shows to press off cave, crack angle can be imaged according to shaft bottom and acid fracturing seam is long
It spends to determine and bore the substantially position for meeting fracture hole, the upper position individual well for boring chance cave is suitble to fill the water.It needs to pay attention to simultaneously: if should
The wave impedance inversion attribute of well shows laterally upper Reservoir Body development individual well, is not appropriate for full-scale water injection, full-scale water injection is easy
Oil is dispersed, if well test data is shown, if cave is smaller, and the well of fracture development is also not suitable for full-scale water injection.It is above-mentioned
Deterministic process can realize those skilled in the art according to the existing experience in this field and equipment.Above-mentioned deterministic process
Purpose be the individual well that some unobvious suitable water fillings are excluded according to existing experience, for that can be infused according to above-mentioned micro-judgment
The individual well of water calculates water injection rate using the solution of the present invention, and is filled the water using the specific water flooding regime of the application, to avoid
Individual well improves the problem that strata pressure process causes individual well drowned with water flooding regime, realizes the raising of well yield.
In the solution of the present invention, the oil reservoir saturation pressure is obtained according to following empirical equation 1
--- formula 1
Wherein PbFor saturation pressure, units MPa；RsFor gas-oil ratio；rgFor natural gas relative density；T is formation temperature；ro
For crude oil density in stock tank, normal pressure, 20 DEG C are measured.
Likewise, the oil reservoir saturation pressure can also be obtained with 1 ' according to the following formula
--- 1 ' of formula
Wherein PbFor saturation pressure, units MPa；R is gas-oil ratio；roFor crude oil density in stock tank, normal pressure, 20 DEG C are measured；rgFor
Natural gas relative density；A is statistical constant；B is intercept.Wherein statistical constant A is linear gradient；Intercept b is cutting for ordinate
Away from.Gas-oil ratio and natural gas relative density, formation temperature, crude oil density in stock tank in above-mentioned two formula, can use
Conventional technical means in the art obtains.
Formula 1,1 ' of formula usually may be used to obtain oil reservoir saturation pressure, and can use the PVT money of existing oil well
Material is verified, can also be by comparing the correlation of two formula, selection and the higher public affairs of the practical fitting correlation coefficient in oil field
Formula carries out the calculating of oil reservoir saturation pressure, what this can be achieved on for a person skilled in the art.In actual production, formula
The matching correlation of 1 ' is higher, and the saturation pressure for calculating no PVT data individual well.
In another embodiment of the invention, it if there are water bodys for individual well, can be obtained with according to the following formula 2
The oil in place (individual well reserves scale or cave size can also be become) of the individual well
NpBo+WpBw=NBoiCotΔP+We--- formula 2
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；WpFor ground accumulation
Water yield, unit m3；Bw is the volume factor of water；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor
Total compression coefficient 1/MPa；Δ P is overall presure drop, units MPa；We is water influx, unit m3。
Further, if water body is not present in individual well, it can simplify the oil in place that the individual well is obtained for 2 ' of formula,
NpBo/ Δ P=NBoiCot--- formula 2 '
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；Δ P is overall presure drop,
Units MPa；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor total compression coefficient 1/MPa.
It, can be with the secondary gas according to the following formula 3 individual wells in another specific embodiment of the invention
Volume
VIt is secondary=N ' a --- formula 3；
Wherein VIt is secondaryFor the secondary gas volume in the individual well；N ' is remaining geologic reserves when pressure is down to saturation pressure,
Unit m3；A is the gassiness ratio in the individual well, and a passes through described in the isothermal pressure drop curve determination of formation fluid phase diagram
Air-liquid state content under the strata pressure of individual well in the individual well obtains.Remaining geologic reserves when N ' pressure is down to saturation pressure
It can be by the oil in place of the individual well that step 2) obtains and the oil mass of output is calculated.
The solution of the present invention has the advantages that
1) the solution of the present invention can be easier to and accurately obtain restore the strata pressure of individual well to oil reservoir saturation pressure
The above required water injection rate.
2) using the solution of the present invention the carbonate rock individual well strata pressure be lower than its oil reservoir saturation pressure when into
Row processing is avoided that individual well improves the problem that strata pressure process causes individual well drowned with water flooding regime.
3) well yield can be significantly improved using the solution of the present invention, and validity period is long, risk is small, at low cost excellent
Point.
Detailed description of the invention
The isothermal pressure drop curve graph of the formation fluid phase diagram of carbonate rock individual well in Fig. 1 embodiment of the present invention 1.It is wherein horizontal
Coordinate represents temperature, ordinate representative pressure, and Pm is saturation pressure, 5 curves be gas with various Molar content (20%,
40%, 60%, 80%, 100%) the isothermal pressure drop curve graph under, longitudinal dotted line represent the temperature of oil reservoir, lateral dotted line generation
The saturation pressure of table oil reservoir.
Specific embodiment
To keep the purpose of the present invention, technical solution and technical effect clearer, it is embodied below in conjunction with the present invention
Example and attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, but following embodiment should not be understood as
Limiting the scope of the invention, and based on the embodiments of the present invention, those of ordinary skill in the art are not making
All other embodiment obtained, shall fall within the protection scope of the present invention under the premise of creative work.
Embodiment 1 is carried out using the method for the present invention when the strata pressure of carbonate rock individual well is lower than its oil reservoir saturation pressure
Processing.
A certain carbonate rock individual well, well depth 6994.61m belong to volatility light oil reservoirs, the original formation pressure of individual well
76.88MPa, since the well belongs to water energy cave type reservoir on the weak side, strata pressure declines rapidly after operation, exploits 10
Month after, which is down under saturation pressure, occur stratum degassing phenomenon, steam oil ratio (SOR) from rise less than 600 rapidly to
3500, day oil-producing from 30 tons drop to 3 tons, oil density declines to a great extent.
At when being lower than its oil reservoir saturation pressure to the strata pressure of the carbonate rock individual well using method of the invention
Reason process is as follows:
1) strata pressure for measuring the individual well, obtains the difference of the strata pressure of the oil reservoir saturation pressure and the individual well
Value, i.e. difference between reservoir pressure and saturation pressure；
The oil reservoir saturation pressure can be obtained with according to the following formula 1
--- formula 1
Wherein PbFor saturation pressure, units MPa；RsFor gas-oil ratio；rgFor natural gas relative density；T is formation temperature；ro
For crude oil density in stock tank, normal pressure, 20 DEG C are measured；Or
1 ' is obtained the oil reservoir saturation pressure according to the following formula
--- 1 ' of formula
Wherein PbFor saturation pressure, units MPa；R is gas-oil ratio；roFor crude oil density in stock tank, normal pressure, 20 DEG C are measured；rgFor
Natural gas relative density；A is statistical constant；B is intercept.By existing PVT data, intended using formula 1 and formula 1 '
Correlation comparison is closed, the higher formula of fitting degree is selected to be calculated.
The saturation pressure of the oil reservoir is obtained in the embodiment of the present application using formula 1 '.This field routine techniques can be used
Means obtain the gas-oil ratio and natural gas relative density, crude oil density in stock tank in above-mentioned formula 1 '.The gas-oil ratio of acquisition is real
Border metric results, natural gas relative density is fluid chemical examination as a result, crude oil density in stock tank is crude oil sampling metering result of laboratory test.
After obtaining above-mentioned value, it is 30.82MPa (PVT test knot that the oil reservoir saturation pressure, which is calculated, according to formula 1 '
The fruit well saturation pressure is 31.12MPa, error very little).
The strata pressure of the well measurements individual well uses direct-reading pressure well institute geodetic layer static pressure, and the ground of the individual well measured is laminated
Power is 27.31MPa.The reservoir formation pressure and the difference of saturation pressure are 3.51MPa.
2) oil in place of the individual well is obtained；
If individual well is there are water body, 2 oil in place for obtaining the individual wells according to the following formula
NpBo+WpBw=NBoiCotΔP+We--- formula 2
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；WpFor ground accumulation
Water yield, unit m3；Bw is the volume factor of water；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor
Total compression coefficient 1/MPa；Δ P is overall presure drop, and the stagnation pressure is reduced to the original formation pressure and the individual well of 1) measurement of individual well
Strata pressure difference, units MPa；We is water influx, unit m3；Or
If water body is not present in individual well, 2 ' obtain the oil in place of the individual well according to the following formula,
NpBo/ Δ P=NBoiCot--- formula 2 '
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；Δ P is overall presure drop,
Units MPa；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor total compression coefficient 1/MPa.
The individual well reserves are obtained using formula 2 in the embodiment of the present application, can be obtained using conventional technical means in the art
Ground cumulative oil production in above-mentioned formula 2, under strata pressure oil volume factor, ground cumulative water production, water volume
Coefficient, reset pressure lower volume coefficient, total compression coefficient, overall presure drop, water influx.The ground cumulative oil production of acquisition is 1.26 ten thousand
Ton (when substituting into formula 2, can be scaled volume, m3), oil volume factor is that the accumulation of 2.5272, ground produces under strata pressure
Water, which is 6 tons, (when substituting into formula 2, can be scaled volume, m3), the volume factor of water can be according to this field hydrodynamics
Teaching material obtains, and the reset pressure lower volume coefficient of water is 1.08, and total compression coefficient 1/MPa, stagnation pressure is reduced to as individual well primitively
Stressor layer and 1) difference of the strata pressure of the individual well of measurement, i.e. 49.57MPa, water influx is approximately 0.Obtaining above-mentioned value
It afterwards, is 6.7 ten thousand tons according to the oil in place that the individual well is calculated in formula 2.
3) the secondary gas volume in the individual well is obtained according to the oil in place of the individual well；
Secondary gas volume in 3 individual wells according to the following formula
VIt is secondary=N ' a --- formula 3；
Wherein VIt is secondaryFor the secondary gas volume in the individual well；N ' is remaining geologic reserves when pressure is down to saturation pressure,
Unit m3；A is the gassiness ratio in the individual well, and a can be determined by the isothermal pressure drop curve of formation fluid phase diagram
Air-liquid state content under the strata pressure of the individual well in the individual well obtains.The isothermal pressure drop of the formation fluid phase diagram
Curve is referring to Fig. 1.It is 27.31MPa that specific method, which is using the actual formation pressure of the individual well measured in 1), is at a temperature of individual well
145 DEG C, according to the two intersection position of the point on phasor and the gas with various Molar content on phasor (20%,
40%, 60%, 80%, 100%) the isothermal pressure drop curve under, estimates gas volume molar content at the point, to obtain the list
Gassiness ratio a in well.This is the conventional method for obtaining the gassiness ratio in individual well in this field, and those skilled in the art can also
With according to other gas volume molar contents (such as: the isothermal under 20%, 40%, 60%, 80%, 85%, 87%100%)
Falloff curve obtains gassiness ratio a.
The secondary gas volume in the individual well obtained is close to 20,000 sides.
4) according to the oil production of unit pressure drop before degassing and the secondary gas volume, being obtained by formula 4 will be described
Individual well strata pressure restores to more than oil reservoir saturation pressure required water injection rate,
VWater filling=VIt is secondary+ b Δ P ' γ --- formula 4,
Wherein VWater fillingFor the water injection rate needed for restoring the strata pressure of the individual well to more than oil reservoir saturation pressure；VIt is secondaryFor
Secondary gas volume in the individual well；The oil production of unit pressure drop, unit m before b is degassing3；Δ P ' is to return needed for water filling
The strata pressure risen, i.e. stagnation pressure liter are greater than or equal to the difference between reservoir pressure and saturation pressure, units MPa；γ is grease volume conversion coefficient；
Due to well VIt is secondaryClose to 20,000 sides；Add up 1.26 ten thousand tons of oil-producing before water filling, strata pressure declines from 76.88 megapascal
To 27.31 megapascal；Grease volume conversion coefficient is obtained using conventional method in that art, is 2.04.Those skilled in the art can be with
Using formula 4, to be restored specific pressure extremely according to the strata pressure that will settle to 27.31 megapascal (at least will be in oil reservoir
It is more than saturation pressure), to determine the water injection rate.
Remain in fracture hole lower curtate position after being precipitated due to the individual well there are also a large amount of heavy components, and the well bores and meets the high portion of fracture hole body
Position can not produce the crude oil of degassing from fracture hole lower curtate position by conventional buck exploitation, and current any machine is adopted mode and is not suitable for such as
The individual well of this high gas-oil ratio (HGOR) can not also implement gas recycling and handle up.According to this field existing experience and equipment to the individual well
Cavern location, the form in cave and cave scale data carry out water filling risk evaluation, and inventor thinks the larger rule of the well
Well will not be drowned by the water filling of mould.
5) following manner fills the water the individual well: the daily water-injection rate side 300-600/day, water injection pressure be greater than 0MPa and
Less than 8MPa.
First round water filling: stopping water filling after the 1-14 days 4408 side's water of injection, checks underground state after water filling, does not go out
Existing well floods, and formation testing pressure rise is 29.35MPa, and strata pressure rises only 2MPa or so, shows that pneumatic jack is shunk, open
Gas-oil ratio still reaches 3000 after well, produces 5 tons of shortage of oil daily.
Second wheel water filling: the well stops water filling after starting to 7th month 2.66 ten thousand sides of water filling in 3rd month, checks water filling
There is not well and floods in underground state afterwards, and formation testing pressure is gone up to 52 megapascal, hence it is evident that is higher than the well saturation pressure
30.82MPa illustrates that pneumatic jack is shunk substantially.
Close well one month, after the 8th month drives a well, oil increasing effect is obvious, day oil-producing up to 50 tons, day oil increment is more than 45 tons,
Gas-oil ratio is down to 300 or so, ends 12nd month, and oil increment is up to 5668 tons, and still self-spray produces at present, and epicycle oil increment is estimated
More than 7000 tons.
It can continue to carry out water injection to keep pressure when epicycle pressure is dropped to close to saturation pressure, it is contemplated that the well by taking turns more
Secondary water injection to keep pressure exploitation, the well can increase the recovery ratio more than 20%, and oil increment can exceed that 10,000 tons.
It can make allow when it is carbonate rock individual well that strata pressure is lower than its oil reservoir saturation pressure using the solution of the present invention
Strata pressure gos up to more than saturation pressure, makes the natural gas being precipitated is counter to dissolve in crude oil, while guaranteeing that great amount of injection water can be on ground
Layer realizes gravity displacement with crude oil, is artificially lifted oil-water interfaces, realizes and increases oily purpose, can't occur to improve well with water flooding regime
Press through the problem that journey causes individual well drowned.
Claims (6)
1. a kind of carbonate rock individual well drop in formation pressure processing method, the carbonate rock individual well is volatilization oil reservoir individual well, institute
The Reservoir type for stating individual well is cave type reservoir, and the strata pressure of the individual well lower than oil reservoir saturation pressure and deaerates,
It the described method comprises the following steps:
1) strata pressure for measuring the individual well, obtains the difference of the strata pressure of the oil reservoir saturation pressure and the individual well,
That is difference between reservoir pressure and saturation pressure；
2) oil in place of the individual well is obtained；
3) the secondary gas volume in the individual well is obtained according to the oil in place of the individual well；
4) it according to the oil production of unit drop in formation pressure before degassing and the secondary gas volume, is incited somebody to action by formula 4
The individual well strata pressure restores to more than oil reservoir saturation pressure required water injection rate,
VWater filling=VIt is secondary+ b Δ P ' γ --- formula 4,
Wherein V water filling is the water injection rate needed for restoring the strata pressure of the individual well to more than oil reservoir saturation pressure；V is secondary to be
Secondary gas volume in the individual well；The oil production of unit pressure drop, unit m before b is degassing3；Δ P ' is to return needed for water filling
The strata pressure risen, i.e. stagnation pressure liter are greater than or equal to the difference between reservoir pressure and saturation pressure, units MPa；γ is grease volume conversion coefficient；
5) individual well is filled the water.
2. carrying out in the following ways according to the method described in claim 1, step 5) fills the water the individual well: day fills the water
The side 300-600/day is measured, water injection pressure is greater than 0MPa and is less than 8MPa.
3. according to the method described in claim 1, further including the determining individual well after step 4) obtains the water injection rate
Cavern location, the form in cave and cave scale, then according to the cavern location, the form in cave and cave scale,
The individual well is filled the water in step 5).
4. method according to claim 1-3, the oil reservoir saturation pressure 1 obtains according to the following formula
Wherein PbFor saturation pressure, units MPa；RsFor gas-oil ratio；rgFor natural gas relative density；T is formation temperature；roFor ground
Oil density, normal pressure, 20 DEG C measure；Or
1 ' is obtained the saturation pressure of the oil reservoir according to the following formula
Wherein PbFor saturation pressure, units MPa；R is gas-oil ratio；roFor crude oil density in stock tank, normal pressure, 20 DEG C are measured；rgIt is natural
Gas relative density；A is statistical constant；B is intercept；
By existing PVT data, correlation is fitted using formula 1 and formula 1 ' and is compared, selects fitting degree higher
One formula is calculated.
5. method according to claim 1-3, if there are water bodys for individual well, according to the following formula described in 2 acquisitions
The oil in place of individual well
NpBo+WpBw=NBoiCotΔP+We--- formula 2
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；WpIt is accumulated for ground and produces water
Amount, unit m3；Bw is the volume factor of water；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor stagnation pressure
Contracting coefficient 1/MPa；Δ P is overall presure drop, and the stagnation pressure is reduced to the original formation pressure of individual well and the individual well of step 1) measurement
Strata pressure difference, units MPa；We is water influx, unit m3；Or
If water body is not present in individual well, 2 ' obtain the oil in place of the individual well according to the following formula,
NpBo/ Δ P=NBoiCot--- formula 2 '
Wherein NpFor ground cumulative oil production, unit m3；BOFor oil volume factor under strata pressure；Δ P is overall presure drop, unit
MPa；N is oil in place, unit m3；BoiFor reset pressure lower volume coefficient；CotFor total compression coefficient 1/MPa.
6. method according to claim 1-3 3 obtains the secondary gas body in the individual well according to the following formula
Product
VIt is secondary=N ' a --- formula 3；
Wherein VIt is secondaryFor the secondary gas volume in the individual well；N ' is remaining geologic reserves when pressure is down to saturation pressure, unit
m3；A is the gassiness ratio in the individual well, and the stratum of the individual well is determined by the isothermal pressure drop curve of formation fluid phase diagram
Air-liquid state content under pressure in the individual well obtains.
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