CN104747144B - Geological stratum selection method based on natural gas multilayer system partial pressure solution - Google Patents
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003345 natural gas Substances 0.000 title claims abstract description 19
- 238000010187 selection method Methods 0.000 title abstract 2
- 239000007789 gas Substances 0.000 claims abstract description 115
- 239000010410 layer Substances 0.000 claims abstract description 72
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 27
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 41
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Abstract
The invention belongs to the technical field of natural gas exploration and development, and particularly provides a geological stratification method based on natural gas multilayer system partial-pressing solution, which comprises the following steps: firstly, analyzing single-layer productivity factors; secondly, analyzing interference among multiple layers of combined test layers; and thirdly, selecting a multilayer gas testing layer section according to the single-layer productivity factor analysis and the multilayer system combination testing interlayer interference analysis. The method aims at solving geological strata of the compact sandstone gas reservoir by dividing and pressing the multilayer system, has reasonable stratum selection method, and ensures the accurate stratum selection of the compact sandstone gas reservoir by dividing and pressing the multilayer system; the method not only can improve the yield of a single well, but also can improve the exploration and development efficiency and save the exploration and development cost, and has stronger practical guiding significance.
Description
Technical field
The invention belongs to natural gas exploration and development technique field are and in particular to a kind of closed based on natural gas many series of strata partial pressure
The geology asked selects layer method.
Background technology
Many series of strata partial pressure closes the difficulty that Seeking Truth is directed to many series of strata compact sandstone gas well many series of strata gassiness, individual layer gas testing yields poorly
Topic, it is possible to achieve one-time continuous partial pressure multistage, a kind of easy construction technology of technological operation, is reducing development cost, is improving storage
Collection layer development degree aspect is a kind of effective method, before having preferable application in terms of straight well improves well yield
Scape.
The premise of many series of strata oil-gas reservoir Efficient Development is by interlayer interference analysis, determines interlayer interference degree, in this base
Rational mining type is selected on plinth, simultaneously as the continuous partial pressure of its many series of strata lacks geology aspect research, at home and abroad lacks
Select layer referential experience.
Many series of strata overlapping compact sandstone gas are ensconced during carrying out commingling production, because permeability of reservoir is low, stream
Body filtrational resistance is big, and interlayer permeability contrast is little, and the impact to interlayer interference for the permeability is extremely limited, causes in many series of strata
Sufficient geologic basis are lacked in the formulation of gas testing interval selection scheme and fracturing reform technological measure, for avoiding omitting production capacity,
Engineering is selected and is then selected the ways opening gas-bearing formation as far as possible more in layer, and result well yield is not improved or even tries compared with individual layer on the contrary
Gas yield is lower, has badly influenced gas testing effect.Therefore, it is necessary to analysis DAMAGE OF TIGHT SAND GAS RESERVOIRS gas testing layer individual layer gas deliverability
Influence factor, set up tight sand individual layer gas deliverability evaluation criterion；Analyze the impact that many series of strata close gas deliverability during examination
Factor；Preferably provide geologic basis for many series of strata fracturing reform gas testing interval with raising well yield.
Content of the invention
The purpose of the present invention be overcome existing many series of strata overlapping compact sandstone gas to ensconce and carry out commingling production during, due to
Permeability of reservoir is low, fluid neuron network resistance big, and interlayer permeability contrast is little, and the impact to interlayer interference for the permeability is limited to be caused
The formulation of many series of strata gas testing interval selection scheme and fracturing reform technological measure lack sufficient geologic basis and affects gas testing
The problem of effect.
The technical scheme is that provide a kind of the geology asked closed based on natural gas many series of strata partial pressure select layer method, bag
Include following steps：
The first step, individual layer production capacity factor analysis, detailed process is as follows：
1) geology characteristic according to Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with type of sedimentary facies, rock
The sand body structure type of Sandstone Gas Reservoir is divided into box, bell and dentation type three class by type, the rhythm.
2) by the research of casting body flake and the identification of rock ore deposit component, obtaining Sandstone Gas Reservoir quartz content, draw
Quartz content isogram, divides reservoir rock types by quartz content isogram.
3) measuring process 2) in the permeability of different reservoir rock type reservoir, porosity, gas saturation, gas-bearing formation thick
Degree, calculates energy storage coefficient and the reservoir capacity of this reservoir.
4) common according to the scope of sand body structure type in above-mentioned three steps, the content, energy storage coefficient and reservoir capacity of quartz
Determine the classification of gas-bearing formation, gas-bearing formation is divided into I～V class, I class gas-bearing formation is sand body structure is box, quartz content>90%th, energy storage system
Number>0.4th, reservoir capacity>6；II class gas-bearing formation is sand body structure is box or bell, quartz content>85%th, energy storage coefficient 0.3～
0.4th, reservoir capacity 1～6；III class gas-bearing formation is sand body structure is bell, quartz content>80%th, energy storage coefficient 0.16～0.3, production capacity
Coefficient 0.6～1；IV class gas-bearing formation is sand body structure is bell or dentation type, quartz content>75%th, energy storage coefficient 0.1～0.16, product
Can coefficient 0.3～0.6；V class gas-bearing formation is sand body structure is dentation type, quartz content<75%th, energy storage coefficient<0.16th, reservoir capacity
<0.3.
Second step, many series of strata close examination interlayer interference analysis, and detailed process is as follows：
1) pressure break-gas testing process is carried out to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, closing well recovers
Pressure, measurement stratum static pressure PfWith surface casing pressure Pc, by the stratum static pressure P recordingfWith surface casing pressure PcCalculate now gas column pressure
Power gradient, gas gradient=(stratum static pressure Pf- surface casing pressure Pc)/depth difference △ H；Wherein, PfFor the actual measurement of purpose interval
Strata pressure, MPa, PcSurface casing pressure after closing well recovers after arranging for fracturing fluid is anti-, MPa, △ H is the depth of purpose interval and well head
Spend poor, m.
2) pass through the depth difference between gas gradient and main productive layers, calculate air-flow when flowing through each main productive layers
Pressure, the Measured formation pressure of the stream pressure of the main productive layers calculating and main productive layers is compared, stream pressure
It is more than 2.5Mpa, then serious interlayer interference with strata pressure difference, stream pressure is less than 2.5Mpa, then layer with strata pressure difference
Between disturb little.
3rd step, closes examination interlayer interference analysis according to individual layer production capacity factor analysis and many series of strata and selects many series of strata gas testing layer
Section, detailed process is as follows：
1) reservoir that above-mentioned first step Mesosphere is I～IV class is selected to close examination, V class reservoir individually seeks product or in no warp
Product is not sought under Ji vehicle benefits situation；
2) select stream pressure to be less than 2.5Mpa with strata pressure, disturb little layer position to close examination, and pressure difference value is more than
Product is then individually sought in 2.5Mpa, the layer position of serious interference；
3), when the fooled gas well of plane is located at many series of strata overlapping areas, each major pay is carried out close layer gas testing.
It is higher than 90%, quartz content between 75% that described reservoir rock types are divided in quartz content isogram quartz content
It is less than 75% 3 class with quartz content between～90%.
Described energy storage coefficient is the product of gas pay thickness and porosity and gas saturation.
Described reservoir capacity is the product of permeability and gas pay thickness.
Beneficial effects of the present invention：
(1) this of present invention offer selects layer method can be directed to fine and close sand based on the geology that the conjunction of natural gas many series of strata partial pressure is asked
Rock gas reservoir many series of strata partial pressure closes and asks geology to select layer, selects layer method rationally it can be ensured that DAMAGE OF TIGHT SAND GAS RESERVOIRS many series of strata partial pressure is closed and asked
Accurately select layer.
(2) this of present invention offer selects the many series of strata of layer method actual measurement to divide based on the geology that the conjunction of natural gas many series of strata partial pressure is asked
Jing10Kou is sought in pressing, selects 62 layers of layer, coincidence rate 100%, and 10 mouthfuls of wells all obtain industrial gas, can save great amount of investment cost.
(3) this of present invention offer selects layer method not only can improve based on the geology that the conjunction of natural gas many series of strata partial pressure is asked
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.
Brief description
Fig. 1 is the schematic flow sheet of the present invention.
Fig. 2 is the present invention to m37 well gas-producing profile column schematic diagram.
Specific embodiment
Embodiment 1：
During overcoming existing many series of strata overlapping compact sandstone gas plants to carry out commingling production, due to reservoir infiltration
Rate is low, fluid neuron network resistance big, and interlayer permeability contrast is little, and the impact to interlayer interference for the permeability is limited to be caused in the examination of many series of strata
Lack sufficient geologic basis in the formulation of gas-bearing formation section selection scheme and fracturing reform technological measure and affect the problem of gas testing effect,
Present embodiments provide and a kind of as shown in Figure 1 the geology asked is closed based on natural gas many series of strata partial pressure select layer method, including as follows
Step：
The first step, individual layer production capacity factor analysis, detailed process is as follows：
1) geology characteristic according to Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with type of sedimentary facies, rock
Type, the rhythm divide the sand body structure type of Sandstone Gas Reservoir；The sand body structure type of this Sandstone Gas Reservoir be divided into box-shaped,
Bell and profile of tooth three class, changes according in log response with reference to rock type under a sedimentary rhythm in same type of sedimentary facies
Natural gamma curve form, be such as shaped as rectangle then be box, be shaped as inverted triangle shape be bell, be shaped as sawtooth change be then
Sawtooth pattern.
2) by the research of casting body flake and the identification of rock ore deposit component, obtaining Sandstone Gas Reservoir quartz content, draw
Quartz content isogram, divides reservoir rock types by quartz content isogram, and described reservoir rock types are divided into stone
In English content isogram, quartz content is higher than 90%, quartz content between 75%～90% and quartz content is less than 75% 3
Class；Quartz content is higher than 90% reflection is that physical property is developed relatively, and payzone open-flow capacity is high；Quartz content is between 75%～90%
Reflection is that physical property is relatively developed, and payzone open-flow capacity is higher；Quartz content is less than 75% reflection physical property and less develops, payzone no choked flow
Amount is relatively low.
3) measuring process 2) in the permeability of different reservoir rock type reservoir, porosity, gas saturation, gas-bearing formation thick
Degree, calculates energy storage coefficient and the reservoir capacity of this reservoir, and energy storage coefficient is gas pay thickness and porosity and the taking advantage of of gas saturation
Long-pending, reservoir capacity is the product of permeability and gas pay thickness, evaluates the gas deliverability of gas-bearing formation by energy storage coefficient and reservoir capacity,
As a certain gas field energy storage coefficient, more than 0.4 and reservoir capacity is more than 6 yield and is more than 100,000 sides/day, and energy storage coefficient is less than 0.16
And reservoir capacity is less than 0.6 yield and is less than 10,000 sides/day.
4) common according to the scope of sand body structure type in above-mentioned three steps, the content, energy storage coefficient and reservoir capacity of quartz
Determine the classification of gas-bearing formation, gas-bearing formation is divided into I～V class, I class gas-bearing formation is sand body structure is box, quartz content>90%th, energy storage system
Number>0.4th, reservoir capacity>6；II class gas-bearing formation is sand body structure is box or bell, quartz content>85%th, energy storage coefficient 0.3～
0.4th, reservoir capacity 1～6；III class gas-bearing formation is sand body structure is bell, quartz content>80%th, energy storage coefficient 0.16～0.3, production capacity
Coefficient 0.6～1；IV class gas-bearing formation is sand body structure is bell or dentation type, quartz content>75%th, energy storage coefficient 0.1～0.16, product
Can coefficient 0.3～0.6；V class gas-bearing formation is sand body structure is dentation type, quartz content<75%th, energy storage coefficient<0.16th, reservoir capacity
<0.3.
Second step, many series of strata close examination interlayer interference analysis, and detailed process is as follows：
1) pressure break-gas testing process is carried out to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, closing well recovers
Pressure, measurement stratum static pressure PfWith surface casing pressure Pc, by the stratum static pressure P recordingfWith surface casing pressure PcCalculate now gas column pressure
Power gradient, gas gradient=(stratum static pressure Pf- surface casing pressure Pc)/depth difference △ H；Wherein, PfFor the actual measurement of purpose interval
Strata pressure, MPa, PcSurface casing pressure after closing well recovers after arranging for fracturing fluid is anti-, MPa, △ H is the depth of purpose interval and well head
Spend poor, m.
2) pass through the depth difference between gas gradient and main productive layers, calculate air-flow when flowing through each main productive layers
Pressure, the Measured formation pressure of the stream pressure of the main productive layers calculating and main productive layers is compared, stream pressure
It is more than 2.5Mpa, then serious interlayer interference with strata pressure difference, stream pressure is less than 2.5Mpa, then layer with strata pressure difference
Between disturb little；Described main productive layers are that in certain region most of well production is higher or most well has the layer position of production capacity.
3rd step, closes examination interlayer interference analysis according to individual layer production capacity factor analysis and many series of strata and selects many series of strata gas testing layer
Section, detailed process is as follows：
1) reservoir that above-mentioned first step Mesosphere is I～IV class is selected to close examination, V class reservoir individually seeks product or in no warp
Product is not sought under Ji vehicle benefits situation.
2) select stream pressure to be less than 2.5Mpa with strata pressure, disturb little layer position to close examination, and pressure difference value is more than
Product is then individually sought in 2.5Mpa, the layer position of serious interference.
3) consider to improve reserves abundance and resource graded factor, when the fooled gas well of plane is located at many series of strata overlapping areas, right
Each major pay carries out closing layer gas testing.
This of present invention offer selects layer method can be directed to tight sand based on the geology that the conjunction of natural gas many series of strata partial pressure is asked
Gas reservoir many series of strata partial pressure is closed and asks geology to select layer, selects layer method rationally it can be ensured that DAMAGE OF TIGHT SAND GAS RESERVOIRS many series of strata partial pressure closes the essence asked
Really select layer；Well yield not only can be improved, exploration and development efficiency can be improved simultaneously, save cost of exploration ＆ development, have relatively
Strong practical guided significance.
Embodiment 2：
On the basis of embodiment 1, the present embodiment is directed to certain basin many series of strata partial pressure and closes examination test well m37 well using this
Bright offer the test that the geology asked selects layer method to carry out is closed based on natural gas many series of strata partial pressure, result is as shown in Figure 2.
Certain basin many series of strata partial pressure closes examination test well m37 well in first time gas testing, and cascode opens 9 layers of gas-bearing formation section, is respectively
Horse five2 1+ horse five2 2, Taiyuan Forma-tion, mountain 22, mountain 1, box 8On, box 7, box 6, box 3 two-layer, obtain well head yield 1.9 × 104m3/ d's is low
Aerogenesis stream, other individual well individual layer gas testing Yield compari@with same basin, output increased is inconspicuous.And to aerogenesis after first time gas testing
Section calculates and analyzes, and closes, based on natural gas many series of strata partial pressure, the geology asked by using the present invention and selects layer method, by box 7 He
Mountain 22Section is closed, and second gas testing asks product to obtain well head yield 5.7 × 104m3The industrial gas of/d, well head yield is tried than for the first time
Air lift is high 3 times.
In addition, after gas-producing profile Fig. 2 can be seen that 7 sections of box of closing, adjacent 6 sections of gas production of gas-bearing formation box are by original
925.7m3/ d brings up to 20116.8m3/ d, improves 22 times；Close mountain 22Duan Hou, adjacent gas-bearing formation Taiyuan Forma-tion gas production is by original
8171.4m3/ d brings up to 25476.9m3/ d, gas production improves 3 times.
In addition, selecting layer method actual measurement many using this of present invention offer based on the geology that the conjunction of natural gas many series of strata partial pressure is asked
Series of strata partial pressure is closed and is sought Jing10Kou, selects 62 layers of layer, coincidence rate 100%, and 10 mouthfuls of wells all to obtain industrial gas, saves great amount of investment cost.
The only illustration to the present invention exemplified as above, does not constitute the restriction to protection scope of the present invention, all
It is that same or analogous design belongs within protection scope of the present invention with the present invention.
Claims (4)
1. a kind of based on natural gas many series of strata partial pressure close the geology asked select layer method it is characterised in that：Comprise the steps：
The first step, individual layer production capacity factor analysis, detailed process is as follows：
1) geology characteristic according to Sandstone Gas Reservoir, according to natural gamma ray logging response, in conjunction with type of sedimentary facies, rock type
The sand body structure type of Sandstone Gas Reservoir is divided into box, bell and dentation type three class by type, the rhythm；
2) by the research of casting body flake and the identification of rock ore deposit component, obtaining Sandstone Gas Reservoir quartz content, draw quartz
Content isogram, divides reservoir rock types by quartz content isogram；
3) measuring process 2) in the permeability of different reservoir rock type reservoir, porosity, gas saturation, gas pay thickness, meter
Calculate energy storage coefficient and the reservoir capacity of this reservoir；
4) jointly determined according to the scope of sand body structure type in above-mentioned three steps, the content, energy storage coefficient and reservoir capacity of quartz
The classification of gas-bearing formation, gas-bearing formation is divided into I～V class, and I class gas-bearing formation is sand body structure is box, quartz content>90%th, energy storage coefficient>
0.4th, reservoir capacity>6；II class gas-bearing formation is sand body structure is box or bell, quartz content>85%th, 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%th, 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%th, energy storage coefficient 0.1～0.16, production capacity system
Number 0.3～0.6；V class gas-bearing formation is sand body structure is dentation type, quartz content<75%th, energy storage coefficient<0.16th, reservoir capacity<
0.3；
Second step, many series of strata close examination interlayer interference analysis, and detailed process is as follows：
1) pressure break-gas testing process is carried out to gas prospect pit interval of interest, after fracturing fluid recovery (backflow) goes out target zone, closing well recovers pressure,
Measurement stratum static pressure PfWith surface casing pressure Pc, by the stratum static pressure P recordingfWith surface casing pressure PcCalculate now gas column pressure ladder
Degree, gas gradient=(stratum static pressure Pf- surface casing pressure Pc)/depth difference △ H；Wherein, PfSurvey stratum for purpose interval
Pressure, MPa, PcSurface casing pressure after closing well recovers after arranging for fracturing fluid is anti-, MPa, △ H is the depth of purpose interval and well head
Difference, m；
2) pass through the depth difference between gas gradient and main productive layers, calculate the pressure when flowing through each main productive layers for the air-flow
Power, the Measured formation pressure of the stream pressure of the main productive layers calculating and main productive layers is compared, stream pressure with ground
Stressor layer difference is more than 2.5Mpa, then serious interlayer interference, and stream pressure is less than 2.5Mpa with strata pressure difference, then interlayer is done
Disturb little；
3rd step, closes examination interlayer interference analysis according to individual layer production capacity factor analysis and many series of strata and selects many series of strata gas testing interval, tool
Body process is as follows：
1) reservoir that above-mentioned first step Mesosphere is I～IV class is selected to close examination, V class reservoir individually seeks product or in no economic effect
Product is not sought in the case of benefit；
2) select stream pressure and strata pressure to be less than 2.5Mpa, disturb little layer position to close examination, and pressure difference value be more than 2.5Mpa,
Product is then individually sought in the layer position of serious interference；
3), when the fooled gas well of plane is located at many series of strata overlapping areas, each major pay is carried out close layer gas testing.
2. as claimed in claim 1 based on natural gas many series of strata partial pressure close the geology asked select layer method it is characterised in that：Described
Reservoir rock types be divided in quartz content isogram quartz content be higher than 90%, quartz content between 75%～90% and
Quartz content is less than 75% 3 class.
3. as claimed in claim 1 based on natural gas many series of strata partial pressure close the geology asked select layer method it is characterised in that：Described
Energy storage coefficient is the product of gas pay thickness and porosity and gas saturation.
4. as claimed in claim 1 based on natural gas many series of strata partial pressure close the geology asked select layer method it is characterised in that：Described
Reservoir capacity is the product of permeability and gas pay thickness.
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| 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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