CN109343145A - Method is determined based on the Recover of Tight Sandstone Gas Reservoir enrichment region of amendment reserves abundance - Google Patents
Method is determined based on the Recover of Tight Sandstone Gas Reservoir enrichment region of amendment reserves abundance Download PDFInfo
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Abstract
It is a kind of that method is determined based on the Recover of Tight Sandstone Gas Reservoir enrichment region for correcting reserves abundance, comprising: to determine the gas deliverability of different series of strata, and the standardization between series of strata is carried out by the layer position based on highest gas deliverability, obtain the opposite gas deliverability of each series of strata；Reserves abundance is modified with respect to gas deliverability based on each series of strata, obtains the total amendment reserves abundance in gas well longitudinal layer position；The block for determining that amendment reserves abundance is greater than reference value is enrichment region.
Description
Technical field
The present invention relates to the reservoirs of oil development and enrichment region to determine method, is that the reserves abundance for meeting reservoir is bored with gas well
Based on, reserves abundance is corrected using gas well zonal testing dynamic data, forms a kind of amendment of combination of dynamic and static
Reserves abundance enrichment region determines method.It is rich more particularly, to a kind of Recover of Tight Sandstone Gas Reservoir based on amendment reserves abundance
Ji Qu determines method.
Background technique
Recover of Tight Sandstone Gas Reservoir is important one of the gas reservoir types in China, and reserves and yield account for national gross reserves and total
30% or so of yield, tight sand gas reservoir, which usually has, to have a very wide distribution, the strong feature of heterogeneity, scale of sand bodies ruler
Degree, pore structure, penetrating power and water saturation all have biggish difference in vertically and horizontally spread, dispose phase by enrichment region
It is to realize that such gas reservoir benefit develops main and most real approach to high-yield well.It is enriched at present for hypotonic tight gas reservoir
The determination in area mainly bores the reserves abundance for meeting reservoir position as foundation using gas well, has lacked the verifying of Production development data response,
There is a problem of reserves abundance and gas well waterout control reserve correlation difference, affects the determination of enrichment region.
Therefore, in order to solve many insufficient and defects of the above-mentioned prior art, it is necessary to study a kind of based on amendment reserves
The Recover of Tight Sandstone Gas Reservoir enrichment region of abundance determines method.
Summary of the invention
The present invention is completed in view of at least one above problem, the present invention considers that gas well liquid loading dynamic provides by taking into account
Material is corrected static reserve abundance, forms a kind of method of combining dynamic and static research to improve the reliability of enrichment region, is further
The Efficient Development for promoting hypotonic tight gas reservoir provides technical support.
It should be noted that gas well waterout control reserve: referring in exploitation oil in place in existing technology and existing
Under conditions of well pattern mining method is constant, gas well puts into production until gas production and the strata pressure involved in range are reduced to
When zero, the natural gas total amount that can be flowed out from gas reservoir.
Reserves abundance refers to gas reservoir unit area (A=1km2) reserves, hundred million sides of unit/km2。
According to an aspect of the present invention, it influences gas well and bores the master for meeting reservoir position reserves abundance and dynamic control reserve correlation
Want factor to be reservoir in the longitudinal direction and have multiple series of strata, the scale scale and physical property that each series of strata net sandstone extends have compared with
Big difference causes the difference of gas well liquid loading yield and pressure drop, eventually leads to the dynamic control reserve difference of measurement.For this purpose, building
Enrichment region based on vertical correction reserves abundance determines method, comprising: first, dynamic data is tested based on produced on-site, and it is clear
The gas deliverability of different payzones, i.e. unit thickness gas-bearing formation produce tolerance daily；Second, it establishes between multilayer system gas-bearing formation gas deliverability and determines
Magnitude relation (chooses the wherein maximum series of strata of gas deliverability to compare as benchmark series of strata, other series of strata with the phase, it is thick to carry out gas-bearing formation
The standardization of degree)；Third establishes multilayer system reserves abundance correction model, the key parameter index determined as enrichment region.
According to a further aspect of the invention, a kind of Recover of Tight Sandstone Gas Reservoir enrichment region based on amendment reserves abundance is provided
Determine method, it is characterised in that the following steps are included:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original
Beginning gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is that gas reservoir is primitively laminated
Power, MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor.
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness
The daily output tolerance of gas-bearing formation；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the production gas energy of benchmark series of strata
Power is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', it is rich to reserves
Degree is modified, and obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZTo be revised comprising all longitudinal series of strata
Gross reserves abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region.
According to a further aspect of the invention, a kind of Recover of Tight Sandstone Gas Reservoir exploitation based on amendment reserves abundance is additionally provided
Method, it is characterised in that the following steps are included:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original
Beginning gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is that gas reservoir is primitively laminated
Power, MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor；
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness
The daily output tolerance of gas-bearing formation；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the production gas energy of benchmark series of strata
Power is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', it is rich to reserves
Degree is modified, and obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZTo be revised comprising all longitudinal series of strata
Gross reserves abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region；
It extracts natural gas in enrichment region well spacing.
Compared with prior art, the beneficial effects of the present invention are:
The revised reserves abundance of the present invention can preferably react performance of the gas well on Production development, thus in enrichment region
Determination during, be capable of providing more accurately as a result, the deployment ratio of high-yield well can be improved, be conducive to improve natural gas extraction
Benefit.
Detailed description of the invention
Fig. 1 is that chance reserves abundance and dynamic control reserve relational graph are bored in a kind of well point of preferred embodiment according to the present invention.
Fig. 2 is a kind of unit thickness gas-bearing formation daily gas ability comparison diagram of preferred embodiment according to the present invention.
Fig. 3 be according to the present invention a kind of preferred embodiment using 2 sections of mountain series of strata as the gas deliverability analysis chart of standard.
Fig. 4 is the amendment reserves abundance and dynamic control reserve relational graph of a kind of preferred embodiment according to the present invention.
Fig. 5 is that a kind of enrichment region based on amendment reserves abundance of preferred embodiment according to the present invention determines effect picture.
Fig. 6 is the reserves abundance method and amendment reserves abundance method contrast table of a kind of preferred embodiment according to the present invention.
Specific embodiment
With reference to the accompanying drawing, preferred forms of the invention, specific implementation here are described by preferred embodiment
Mode is to explain the present invention in detail, should not be construed as limiting the invention, and is not departing from spirit and reality of the invention
In the case where matter range, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Embodiment 1
Referring to attached drawing 1-6, it is preferable that the present invention provides a kind of Recover of Tight Sandstone Gas Reservoir based on amendment reserves abundance
Enrichment region determines method, it is characterised in that the following steps are included:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original
Beginning gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is that gas reservoir is primitively laminated
Power, MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor；
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness
The daily output tolerance of gas-bearing formation；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the production gas energy of benchmark series of strata
Power is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', it is rich to reserves
Degree is modified, and obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZTo be revised comprising all longitudinal series of strata
Gross reserves abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region.
Preferably, in reserves abundance F formula, by taking Ordos Basin Shenmu County gas field as an example, payzone be 8 sections of box, 1 section of mountain,
4 gas pay sections such as 2 sections of mountain, Taiyuan Forma-tion, by measuring, in this area, Psc is ground standard pressure, MPa, value
0.101MPa；Tsc is ground standard temperature, degree Kelvin k, value 293.15K；Pi is gas reservoir original formation pressure, Mpa, value
29Mpa；T is average gas-bearing formation temperature K, value 380k；Zi is original gas deviation factor, zero dimension, value 0.96.Preferably,
Other parameters are obtained by well logging, different because of each well.
Preferably, the present invention also provides it is a kind of based on amendment reserves abundance Recover of Tight Sandstone Gas Reservoir recovery method,
Characterized by the following steps:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original
Beginning gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is that gas reservoir is primitively laminated
Power, MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor；
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness
The daily output tolerance of gas-bearing formation；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the production gas energy of benchmark series of strata
Power is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', it is rich to reserves
Degree is modified, and obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZTo be revised comprising all longitudinal series of strata
Gross reserves abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region；
It extracts natural gas in enrichment region well spacing.
Preferably, the present invention provides the enrichment regions based on correcting reserves abundance to determine method, comprising: based on scene
Production test dynamic data specifies the gas deliverability of different payzones, i.e. unit thickness gas-bearing formation produces tolerance daily；Establish multilayer system gas-bearing formation
Between gas deliverability quantitative relationship (choose wherein the maximum series of strata of gas deliverability as benchmark series of strata, other series of strata and phase into
Row comparison, carries out the standardization of gas pay thickness)；Multilayer system reserves abundance correction model is established, is determined as enrichment region
Key parameter index.
Advantageously, by the static reservoir data and actual production dynamic data of comprehensive the bored chance of gas well, formed one kind with
Enrichment region based on correction reserves abundance determines method, improves hypotonic tight gas reservoir static reserve abundance and dynamic control is stored up
The characteristic for measuring correlation difference improves the deployment of reliability and Efficient Development well that hypotonic tight gas reservoir enrichment region determines, to have
Effect instructs and supports such gas field Productivity Construction and continue upper production and stable yields.
It preferably, is respectively after gas well initially bores chance reservoir reserves abundance and well performance data correction referring to Fig. 1 and 4
Reserves abundance and gas well waterout control reserve regression relation, it is seen then that the reserves abundance after dynamic data response corrections
It is significantly enhanced with gas well waterout control reserve correlation, can more accurately implement the determination work of gas field enrichment region.
Embodiment 2
Referring to Fig. 1-6, it is preferable that the present invention provides a kind of Recover of Tight Sandstone Gas Reservoir based on amendment reserves abundance is rich
Ji Qu determines method, it is characterised in that the following steps are included:
1. reserves abundance measures:
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original
Beginning gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is that gas reservoir is primitively laminated
Power, MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor, zero dimension.
2. determining different series of strata gas deliverabilities: according to live gas well layerwise production test data, determining the production of different series of strata
Gas ability, i.e., the daily output tolerance of each series of strata unit thickness gas-bearing formation, or be payzone rice gas PI.Here, with Erdos mind
For wood gas field, 7 each series of strata are divided into, H1, H4, H6, H8, S1, S2, T are respectively as follows:.Corresponding gas deliverability is respectively as follows: Q1,
Q2, Q3, Q4, Q5, Q6, Q7 (unit 104m3/d/m)。
3. establishing quantitative relationship between each series of strata: selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as base
Quasi- series of strata, such as selection S2, the gas deliverability of benchmark series of strata is 1, remaining series of strata is compared with it, passes through the side being divided by
Formula completes the standardization of gas pay thickness, and obtain each series of strata is respectively as follows: Q1 '=Q1/Q6 relative to S2 layers of gas deliverability,
Q2 '=Q2/Q6, Q3 '=Q3/Q6, Q4 '=Q4/Q6, Q5 '=Q5/Q6, Q6 '=Q6/Q6 (as 1), Q7 '=Q7/Q6, it is (single
Position is 104m3/d/m)。
4. multilayer system reserves abundance correction model: the Production development difference according to caused by fully considering interlayer difference is established,
The opposite gas deliverability value of obtained each series of strata, i.e. Q1 ', Q2 ', Q3 ', Q4 ', Q5 ', Q6 ' (=1), Q7 ', to reserves abundance
It is modified, obtains correction model (formula):
FXZ=Q1 ' × FH1+Q2′×FH4+Q3′×FH6+Q4′×FH8+Q5′×FS1+Q6′×FS2+Q7′×FT
In formula: FH1、FH4、FH6、FH8、FS1、FS1、FTRespectively H1, H4, H6, H8, S1, S2, T layers of reserves abundance,
108m3/km2；FXZFor the revised gross reserves abundance comprising all longitudinal series of strata, 108m3/km2；Q1 ', Q2 ', Q3 ', Q4 ',
Q5 ', Q6 ' (=1), Q7 ' they are opposite gas deliverability value, hereon referred to as correction factor, 104m3/d/m。
5. according to amendment reserves abundance FXZDetermine enrichment region.
Preferably, it further extracts natural gas in enrichment region well spacing.
Preferably, referring to Fig. 6, pass through reserves abundance, amendment reserves abundance and gas well waterout control reserve cross analysis pair
Than the correlation of amendment reserves abundance and gas well waterout control reserve is obviously improved, Trendline fitting formula correlation
Parameter R2Value is increased to revised 0.665 by 0.182 before correcting, that is, indicates that revised reserves abundance can preferably react
Performance of the gas well on Production development, to be capable of providing more accurate index reference during excellent determining enrichment region, mention
The deployment ratio of high high-yield well.
In conclusion the beneficial effects of the present invention are:
The present invention establishes the quantification corresponding relationship of different payzone gas deliverabilities, has carried out accurate thickness normalized place
Reason is established on the basis of measuring the parameters such as gas-bearing formation porosity, gas saturation according to gas well difference interval Yielding ability difference
Gas deliverability quantitative relationship carries out thickness normalized processing, eventually by layering split point each layer dynamic control reserve of measurement and/or
Lose heart area, to provide foundation for gas field Efficient Development.
The present invention is not limited to above-mentioned specific embodiments.It is understood that not departing from spirit and substance of the present invention model
In the case where enclosing, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Claims (2)
1. a kind of Recover of Tight Sandstone Gas Reservoir enrichment region based on amendment reserves abundance determines method, it is characterised in that including following
Step:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original contains
Gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is gas reservoir original formation pressure,
MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor；
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness gas-bearing formation
Daily output tolerance；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the gas deliverability of benchmark series of strata be
It is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', to reserves abundance into
Row amendment, obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZFor revised total storage comprising all longitudinal series of strata
Amount abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region.
2. a kind of Recover of Tight Sandstone Gas Reservoir recovery method based on amendment reserves abundance, it is characterised in that the following steps are included:
The reserves abundance F for measuring each series of strata obtains i-th layer of reserves abundance Fi,
In formula: F be gas pool reserve abundance, 108m3/km2；H is gas pay thickness, m；Φ is gas-bearing formation porosity, %；Sgi is original contains
Gas saturation, %；Psc is ground standard pressure, MPa；Tsc is ground standard temperature, K；Pi is gas reservoir original formation pressure,
MPa；T is average gas-bearing formation temperature, K；Zi is original gas deviation factor；
According to live gas well layerwise production test data, the gas deliverability of different series of strata is measured, i.e., each series of strata unit thickness gas-bearing formation
Daily output tolerance；
Selected in longitudinal multilayer system wherein the maximum series of strata of gas deliverability as benchmark series of strata, the gas deliverability of benchmark series of strata be
It is 1, remaining series of strata is compared with it, and the standardization of gas pay thickness is completed by way of being divided by；
The Production development difference according to caused by interlayer difference obtains the opposite gas deliverability value Q of each series of stratai', to reserves abundance into
Row amendment, obtains correction model:
In formula: FiRespectively i-th layer of reserves abundance, 108m3/km2；FXZFor revised total storage comprising all longitudinal series of strata
Amount abundance, 108m3/km2；Qi' opposite gas deliverability the value for being i-th layer, hereon referred to as correction factor, 104m3/d/m。
Determine amendment reserves abundance FXZBlock greater than reference value is enrichment region；
It extracts natural gas in enrichment region well spacing.
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