CN104747144A - Geological stratum selection method based on natural gas multi-stratum series partial pressure combined solution - Google Patents
Geological stratum selection method based on natural gas multi-stratum series partial pressure combined solution Download PDFInfo
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Abstract
The invention belongs to the technical field of natural gas exploration and development, and particularly provides a geological stratum selection method based on natural gas multi-stratum series partial pressure combined solution. The method includes the following steps that firstly, single-stratum productivity factors are analyzed; secondly, multi-stratum series combined test inter-stratum interference is analyzed; thirdly, according to the analysis of the single-stratum productivity factors and the analysis of the multi-stratum series combined test inter-stratum interference, multi-stratum series gas test stratums are selected. The method is used for achieving geological stratum selection based on multi-stratum series partial pressure combined solution of a tight sandstone gas reservoir, is reasonable and guarantees accurate stratum selection based on multi-stratum series partial pressure combined solution of the tight sandstone gas reservoir. The method can increase the single-well yield, improve the exploration and development efficiency and lower the exploration and development cost and has great practical guiding significance.
Description
Technical field
The invention belongs to natural gas exploration and development technique field, be specifically related to a kind of geology of dividing pressing to ask based on natural gas multilayer system and select layer method.
Background technology
The difficult problem that multilayer system divides pressing Seeking Truth to yield poorly for tight sand gas well multilayer system of multilayer system gassiness, individual layer gas testing, one-time continuous dividing potential drop multistage can be realized, a kind of construction technology that technological operation is easy, in reduction development cost, improving development degree aspect, reservoir is a kind of effective method, improves in well yield have good application prospect at straight well.
The prerequisite of multilayer system oil-gas reservoir Efficient Development carries out interlayer interference analysis, determine interlayer interference degree, select rational mining type on this basis, simultaneously, because its continuous dividing potential drop of multilayer system lacks the research of geology aspect, at home and abroad lack and select layer referential experience.
For multilayer be superimposed compact sandstone gas ensconce carry out in commingling production process, because permeability of reservoir is low, fluid neuron network resistance is large, interlayer permeability contrast is little, the impact of permeability on interlayer interference is very limited, cause and lack sufficient geologic basis in the gas testing interval selection scheme formulation of multilayer system and fracturing reform technological measure, for avoiding omitting production capacity, select in layer the way then selecting as far as possible to open gas-bearing formation in engineering more, and result well yield does not improve that comparatively individual layer gas testing output is lower even on the contrary, badly influence gas testing effect.Therefore, be necessary the influence factor analyzing DAMAGE OF TIGHT SAND GAS RESERVOIRS gas testing layer individual layer gas deliverability, set up tight sand individual layer gas deliverability evaluation criterion; Analyze the influence factor that gas deliverability when trying closes in multilayer system; For multilayer system fracturing reform gas testing interval preferably provides geologic basis with raising well yield.
Summary of the invention
The object of the invention is to overcome existing multilayer is that superimposed compact sandstone gas plant carries out in commingling production process, because permeability of reservoir is low, fluid neuron network resistance is large, interlayer permeability contrast is little, and the impact of permeability on interlayer interference be limited to be caused and to formulate in multilayer system gas testing interval selection scheme and fracturing reform technological measure lacks sufficient geologic basis and affects the problem of gas testing effect.
Technical scheme of the present invention there is provided a kind of geology of dividing pressing to ask based on natural gas multilayer system and selects layer method, comprises the steps:
The first step, the factor analysis of individual layer production capacity, detailed process is as follows:
1) according to the geology characteristic of Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with type of sedimentary facies, rock type, the rhythm, the sand body structure types of Sandstone Gas Reservoir is divided into box, bell and dentation type three class.
2) by the research of casting body flake and the qualification of rock ore deposit component, obtain Sandstone Gas Reservoir quartz content, draw quartz content isogram, divide reservoir rock types by quartz content isogram.
3) measuring process 2) in permeability, degree of porosity, gas saturation, the gas pay thickness of different reservoir rock type reservoir, calculate energy storage coefficient and the reservoir capacity of this reservoir.
4) classification of gas-bearing formation is jointly determined according to the scope of above-mentioned three step medium sand body structure types, quartzy content, energy storage coefficient and reservoir capacity, gas-bearing formation is divided into I ~ V class, I class gas-bearing formation is sand body structure is box, quartz content >90%, energy storage coefficient >0.4, reservoir capacity >6; II class gas-bearing formation is sand body structure is box or bell, quartz content >85%, energy storage coefficient 0.3 ~ 0.4, reservoir capacity 1 ~ 6; III class gas-bearing formation is sand body structure is bell, quartz content >80%, energy storage coefficient 0.16 ~ 0.3, reservoir capacity 0.6 ~ 1; IV class gas-bearing formation is sand body structure is bell or dentation type, quartz content >75%, energy storage coefficient 0.1 ~ 0.16, reservoir capacity 0.3 ~ 0.6; V class gas-bearing formation is sand body structure is dentation type, quartz content <75%, energy storage coefficient <0.16, reservoir capacity <0.3.
Second step, examination interlayer interference analysis is closed by multilayer system, and detailed process is as follows:
1) carry out pressure break-gas testing process to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, shut in build up pressure, measures stratum static pressure P
fwith surface casing pressure P
c, by the stratum static pressure P recorded
fwith surface casing pressure P
ccalculate now gas gradient, gas gradient=(stratum static pressure P
f-surface casing pressure P
c)/depth difference △ H; Wherein, P
ffor the purpose of interval Measured formation pressure, MPa, P
cthe surface casing pressure after rear shut in build up is arranged, the depth difference of interval and well head for the purpose of MPa, △ H, m for fracturing fluid is counter.
2) by the depth difference between gas gradient and main productive layers, calculate the pressure of air-flow when flowing through each main productive layers, the stream pressure of the main productive layers calculated and the Measured formation pressure of main productive layers are compared, stream pressure and strata pressure difference are greater than 2.5Mpa, then serious interlayer interference, stream pressure and strata pressure difference are less than 2.5Mpa, then interlayer interference is little.
3rd step, close examination interlayer interference according to the factor analysis of individual layer production capacity and multilayer system and analyze selection multilayer system gas testing interval, detailed process is as follows:
1) select above-mentioned first step Mesosphere be I ~ IV class reservoir close examination, V class reservoir ask separately produce or in without economic benefit situation, do not ask product;
2) select stream pressure and strata pressure to be less than 2.5Mpa, disturb little layer position to close examination, pressure difference value is greater than 2.5Mpa, product is then asked separately in the layer position of serious interference;
3), when plane is taken in gas well to be positioned at multilayer be superimposed district, the gas testing of conjunction layer is carried out to each major pay.
Described reservoir rock types to be divided in quartz content isogram quartz content higher than 90%, quartz content between 75% ~ 90% and quartz content be less than 75% 3 class.
Described energy storage coefficient is the product of gas pay thickness and degree of porosity and gas saturation.
Described reservoir capacity is the product of permeability and gas pay thickness.
Beneficial effect of the present invention:
(1) this geology of dividing pressing to ask based on natural gas multilayer system provided by the invention selects layer method pressing can be divided to ask geology to select layer for DAMAGE OF TIGHT SAND GAS RESERVOIRS multilayer system, select layer method reasonable, the accurate choosing layer that DAMAGE OF TIGHT SAND GAS RESERVOIRS multilayer system divides pressing to ask can be guaranteed.
(2) this geology of dividing pressing to ask based on natural gas multilayer system provided by the invention selects layer method actual measurement multilayer system to divide pressing to ask Jing10Kou, select 62 layers, layer, coincidence rate 100%, and 10 mouthfuls of wells all obtains industrial gas, can save great amount of investment cost.
(3) this geology of dividing pressing to ask based on natural gas multilayer system provided by the invention selects layer method not only can improve well yield, can improve exploration and development efficiency simultaneously, save cost of exploration & development, have stronger practical guided significance.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Fig. 2 is that the present invention is to m37 well gas-producing profile column schematic diagram.
Detailed description of the invention
Embodiment 1:
In order to overcome existing multilayer be superimposed compact sandstone gas ensconce carry out in commingling production process, because permeability of reservoir is low, fluid neuron network resistance is large, interlayer permeability contrast is little, the impact of permeability on interlayer interference be limited to be caused and to formulate in multilayer system gas testing interval selection scheme and fracturing reform technological measure lacks sufficient geologic basis and affects the problem of gas testing effect, present embodiments provide a kind of geology of dividing pressing to ask based on natural gas multilayer system as shown in Figure 1 and select layer method, comprise the steps:
The first step, the factor analysis of individual layer production capacity, detailed process is as follows:
1) according to the geology characteristic of Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with the sand body structure types of type of sedimentary facies, rock type, rhythm division Sandstone Gas Reservoir; The sand body structure types of this Sandstone Gas Reservoir is divided into box-shaped, bell and profile of tooth three class, natural gamma curve form according to log response is changed with reference to rock type under a sedimentary rhythm in same type of sedimentary facies, as shape be rectangle then for box, shape is inverted triangle shape is bell, shape be sawtooth change is then sawtooth pattern.
2) pass through the research of casting body flake and the qualification of rock ore deposit component, obtain Sandstone Gas Reservoir quartz content, draw quartz content isogram, divide reservoir rock types by quartz content isogram, described reservoir rock types to be divided in quartz content isogram quartz content higher than 90%, quartz content between 75% ~ 90% and quartz content be less than 75% 3 class; Quartz content is that physical property is grown relatively higher than 90% reflection, and payzone open-flow capacity is high; Quartz content reflects it is that physical property is comparatively grown between 75% ~ 90%, and payzone open-flow capacity is higher; Quartz content is less than 75% reflection physical property comparatively agensis, and payzone open-flow capacity is lower.
3) measuring process 2) in permeability, degree of porosity, gas saturation, the gas pay thickness of different reservoir rock type reservoir, calculate energy storage coefficient and the reservoir capacity of this reservoir, energy storage coefficient is the product of gas pay thickness and degree of porosity and gas saturation, reservoir capacity is the product of permeability and gas pay thickness, the gas deliverability of gas-bearing formation is evaluated by energy storage coefficient and reservoir capacity, as a certain gas field energy storage coefficient is greater than 0.4 and reservoir capacity is greater than 6 output is greater than 100,000 sides/day, energy storage coefficient is less than 0.16 and reservoir capacity is less than 0.6 output is less than 10,000 sides/day.
4) classification of gas-bearing formation is jointly determined according to the scope of above-mentioned three step medium sand body structure types, quartzy content, energy storage coefficient and reservoir capacity, gas-bearing formation is divided into I ~ V class, I class gas-bearing formation is sand body structure is box, quartz content >90%, energy storage coefficient >0.4, reservoir capacity >6; II class gas-bearing formation is sand body structure is box or bell, quartz content >85%, energy storage coefficient 0.3 ~ 0.4, reservoir capacity 1 ~ 6; III class gas-bearing formation is sand body structure is bell, quartz content >80%, energy storage coefficient 0.16 ~ 0.3, reservoir capacity 0.6 ~ 1; IV class gas-bearing formation is sand body structure is bell or dentation type, quartz content >75%, energy storage coefficient 0.1 ~ 0.16, reservoir capacity 0.3 ~ 0.6; V class gas-bearing formation is sand body structure is dentation type, quartz content <75%, energy storage coefficient <0.16, reservoir capacity <0.3.
Second step, examination interlayer interference analysis is closed by multilayer system, and detailed process is as follows:
1) carry out pressure break-gas testing process to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, shut in build up pressure, measures stratum static pressure P
fwith surface casing pressure P
c, by the stratum static pressure P recorded
fwith surface casing pressure P
ccalculate now gas gradient, gas gradient=(stratum static pressure P
f-surface casing pressure P
c)/depth difference △ H; Wherein, P
ffor the purpose of interval Measured formation pressure, MPa, P
cthe surface casing pressure after rear shut in build up is arranged, the depth difference of interval and well head for the purpose of MPa, △ H, m for fracturing fluid is counter.
2) by the depth difference between gas gradient and main productive layers, calculate the pressure of air-flow when flowing through each main productive layers, the stream pressure of the main productive layers calculated and the Measured formation pressure of main productive layers are compared, stream pressure and strata pressure difference are greater than 2.5Mpa, then serious interlayer interference, stream pressure and strata pressure difference are less than 2.5Mpa, then interlayer interference is little; Described main productive layers is the layer position that in certain region, the higher or most well of most of well production has production capacity.
3rd step, close examination interlayer interference according to the factor analysis of individual layer production capacity and multilayer system and analyze selection multilayer system gas testing interval, detailed process is as follows:
1) select above-mentioned first step Mesosphere be I ~ IV class reservoir close examination, V class reservoir ask separately produce or in without economic benefit situation, do not ask product.
2) select stream pressure and strata pressure to be less than 2.5Mpa, disturb little layer position to close examination, pressure difference value is greater than 2.5Mpa, product is then asked separately in the layer position of serious interference.
3) consider and improve reserves abundance and resource graded factor, when plane is taken in gas well to be positioned at multilayer be superimposed district, the gas testing of conjunction layer is carried out to each major pay.
This geology of dividing pressing to ask based on natural gas multilayer system provided by the invention selects layer method pressing can be divided to ask geology to select layer for DAMAGE OF TIGHT SAND GAS RESERVOIRS multilayer system, selects layer method reasonable, can guarantee the accurate choosing layer that DAMAGE OF TIGHT SAND GAS RESERVOIRS multilayer system divides pressing to ask; Not only can improve well yield, exploration and development efficiency can be improved simultaneously, save cost of exploration & development, there is stronger practical guided significance.
Embodiment 2:
On the basis of embodiment 1, the test that the present embodiment divides pressing to have a try to test Jingm37Jing to adopt geology of dividing pressing to ask based on natural gas multilayer system provided by the invention to select layer method to carry out for certain basin multilayer system, result as shown in Figure 2.
Certain basin multilayer system divides pressing to have a try to test Jingm37Jing when first time gas testing, and cascode opens gas-bearing formation section 9 layers, is horse five respectively
2 1+ horse five
2 2, Taiyuan Forma-tion, mountain 2
2, mountain 1, box 8
on, box 7, box 6, box 3 be two-layer, obtains well head output 1.9 × 10
4m
3the low yield air-flow of/d, with other individual well individual layer gas testing Yield compari@of same basin, output increased is not obvious.And to gas-producing profile computation and analysis after first time gas testing, the geology of dividing pressing to ask based on natural gas multilayer system of the application of the invention selects layer method, by box 7 and mountain 2
2section is closed, and second time gas testing is asked to produce and obtained well head output 5.7 × 10
4m
3the industrial gas of/d, well head output improves 3 times than first time gas testing.
In addition, as can be seen from gas-producing profile Fig. 2, after closing 7 sections, box, adjacent gas-bearing formation box 6 sections of gas production are by original 925.7m
3/ d brings up to 20116.8m
3/ d, improves 22 times; Close mountain 2
2duan Hou, adjacent gas-bearing formation Taiyuan Forma-tion gas production is by original 8171.4m
3/ d brings up to 25476.9m
3/ d, gas production improves 3 times.
In addition, utilize this geology of dividing pressing to ask based on natural gas multilayer system provided by the invention to select layer method to survey multilayer system and divide pressing to ask Jing10Kou, select 62 layers, layer, coincidence rate 100%, and 10 mouthfuls of wells all obtain industrial gas, save great amount of investment cost.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (4)
1. the geology of dividing pressing to ask based on natural gas multilayer system selects a layer method, it is characterized in that: comprise the steps:
The first step, the factor analysis of individual layer production capacity, detailed process is as follows:
1) according to the geology characteristic of Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with type of sedimentary facies, rock type, the rhythm, the sand body structure types of Sandstone Gas Reservoir is divided into box, bell and dentation type three class;
2) by the research of casting body flake and the qualification of rock ore deposit component, obtain Sandstone Gas Reservoir quartz content, draw quartz content isogram, divide reservoir rock types by quartz content isogram;
3) measuring process 2) in permeability, degree of porosity, gas saturation, the gas pay thickness of different reservoir rock type reservoir, calculate energy storage coefficient and the reservoir capacity of this reservoir;
4) classification of gas-bearing formation is jointly determined according to the scope of above-mentioned three step medium sand body structure types, quartzy content, energy storage coefficient and reservoir capacity, gas-bearing formation is divided into I ~ V class, I class gas-bearing formation is sand body structure is box, quartz content >90%, energy storage coefficient >0.4, reservoir capacity >6; II class gas-bearing formation is sand body structure is box or bell, quartz content >85%, energy storage coefficient 0.3 ~ 0.4, reservoir capacity 1 ~ 6; III class gas-bearing formation is sand body structure is bell, quartz content >80%, energy storage coefficient 0.16 ~ 0.3, reservoir capacity 0.6 ~ 1; IV class gas-bearing formation is sand body structure is bell or dentation type, quartz content >75%, energy storage coefficient 0.1 ~ 0.16, reservoir capacity 0.3 ~ 0.6; V class gas-bearing formation is sand body structure is dentation type, quartz content <75%, energy storage coefficient <0.16, reservoir capacity <0.3;
Second step, examination interlayer interference analysis is closed by multilayer system, and detailed process is as follows:
1) carry out pressure break-gas testing process to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, shut in build up pressure, measures stratum static pressure P
fwith surface casing pressure P
c, by the stratum static pressure P recorded
fwith surface casing pressure P
ccalculate now gas gradient, gas gradient=(stratum static pressure P
f-surface casing pressure P
c)/depth difference △ H; Wherein, P
ffor the purpose of interval Measured formation pressure, MPa, P
cthe surface casing pressure after rear shut in build up is arranged, the depth difference of interval and well head for the purpose of MPa, △ H, m for fracturing fluid is counter;
2) by the depth difference between gas gradient and main productive layers, calculate the pressure of air-flow when flowing through each main productive layers, the stream pressure of the main productive layers calculated and the Measured formation pressure of main productive layers are compared, stream pressure and strata pressure difference are greater than 2.5Mpa, then serious interlayer interference, stream pressure and strata pressure difference are less than 2.5Mpa, then interlayer interference is little;
3rd step, close examination interlayer interference according to the factor analysis of individual layer production capacity and multilayer system and analyze selection multilayer system gas testing interval, detailed process is as follows:
1) select above-mentioned first step Mesosphere be I ~ IV class reservoir close examination, V class reservoir ask separately produce or in without economic benefit situation, do not ask product;
2) select stream pressure and strata pressure to be less than 2.5Mpa, disturb little layer position to close examination, pressure difference value is greater than 2.5Mpa, product is then asked separately in the layer position of serious interference;
3), when plane is taken in gas well to be positioned at multilayer be superimposed district, the gas testing of conjunction layer is carried out to each major pay.
2. the geology of as claimed in claim 1 dividing pressing to ask based on natural gas multilayer system selects layer method, it is characterized in that: described reservoir rock types to be divided in quartz content isogram quartz content higher than 90%, quartz content between 75% ~ 90% and quartz content be less than 75% 3 class.
3. the geology of dividing pressing to ask based on natural gas multilayer system as claimed in claim 1 selects layer method, it is characterized in that: described energy storage coefficient is the product of gas pay thickness and degree of porosity and gas saturation.
4. the geology of dividing pressing to ask based on natural gas multilayer system as claimed in claim 1 selects layer method, it is characterized in that: described reservoir capacity is the product of permeability and gas pay thickness.
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| CN108446831A (en) * | 2018-02-24 | 2018-08-24 | 中国石油天然气股份有限公司 | A kind of multilayer system partial pressure considering economy, which is closed, to be asked and selects layer method |
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| CN111441766B (en) * | 2020-05-07 | 2023-05-26 | 中国石油天然气股份有限公司 | Hierarchical gas test unobstructed flow prediction method |
| CN111485865A (en) * | 2020-06-04 | 2020-08-04 | 陕西延长石油（集团）有限责任公司 | Gas well spacing calculation method coupling energy storage coefficient and formation coefficient |
| CN112392448A (en) * | 2020-11-24 | 2021-02-23 | 中国石油天然气股份有限公司 | Multilayer dense sandstone gas reservoir perforation well section optimization method |
| CN112392448B (en) * | 2020-11-24 | 2023-05-26 | 中国石油天然气股份有限公司 | Multi-layer system compact sandstone gas reservoir perforation well section optimization method |
| CN112412445A (en) * | 2020-12-18 | 2021-02-26 | 陕西延长石油（集团）有限责任公司 | Digital characterization method for determining compact gas reservoir mixed well type |
| CN112412445B (en) * | 2020-12-18 | 2023-11-28 | 陕西延长石油（集团）有限责任公司 | Digital characterization method for determining tight gas reservoir mixed well type |
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