CN111859244A - Water footprint method for calculating shale gas development - Google Patents
Water footprint method for calculating shale gas development Download PDFInfo
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- CN111859244A CN111859244A CN202010638276.8A CN202010638276A CN111859244A CN 111859244 A CN111859244 A CN 111859244A CN 202010638276 A CN202010638276 A CN 202010638276A CN 111859244 A CN111859244 A CN 111859244A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000002283 diesel fuel Substances 0.000 claims abstract description 12
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 14
- 239000013505 freshwater Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 67
- 239000003245 coal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 206010020015 Heterophoria Diseases 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Abstract
The invention belongs to the technical field of environment influence calculation of energy exploitation, and relates to a water footprint method for calculating shale gas development. The invention provides a water footprint method for quantifying shale gas exploitation from the aspect of life cycle, which comprises direct water consumption and indirect water consumption of shale gas exploitation. On the basis, the national water consumption for completing the future shale gas production target is predicted. The method comprises the following steps: firstly, collecting direct water consumption data of shale gas development; then calculating the consumption of the most three raw materials, namely cement, steel and diesel oil, which are put into the development process of the shale gas, and calculating the indirect water footprint of the development of the shale gas according to the environmental influence; calculating the total water footprint of shale gas development according to the direct water consumption and the indirect water consumption; then calculating the gas production rate of the shale gas single well so as to estimate the water consumption of the shale gas in unit volume; and finally, calculating the water footprint of national shale gas development according to the shale gas development plan.
Description
Technical Field
The invention belongs to the technical field of environment influence calculation of energy exploitation, relates to a water footprint method for calculating shale gas development, and is a water footprint method for calculating shale gas development from the aspect of life cycle.
Background
The social development improves the degree of dependence of human beings on energy demand, the energy supply comprises non-renewable energy such as coal, petroleum and natural gas, and the occupation ratio of coal and petroleum still lies in the first two in the current energy consumption structure. However, with the large consumption of traditional energy sources such as coal and petroleum, the artificially produced waste gas and waste products exceed the self-cleaning capability of the environment, so that the ecological system is unbalanced, and the environmental problem is further worsened. Under the background of current global energy structure adjustment, the gap of future energy demand is increasingly highlighted; meanwhile, climate change puts new demands on the popularization and the promotion of clean energy.
Shale gas is a novel low-carbon energy and is an important component of a new strategy of future energy. In recent years, the exploration and development of shale gas is a new bright spot in the global oil and gas industry due to the adoption of the heterophoria. At present, research on water consumption of shale gas development is mostly focused on direct water consumption, however, a large amount of raw materials (cement, steel and diesel oil) are input in the shale gas development process, and from the perspective of life cycle, the influence of the raw material input on the water consumption of shale gas production is rarely considered.
Disclosure of Invention
In order to solve the problems, the invention provides a water footprint method for quantifying shale gas exploitation from the life cycle perspective, which comprises direct water consumption and indirect water consumption of shale gas exploitation. On the basis, the national water consumption for completing the future shale gas production target is predicted.
In order to achieve the purpose, the invention provides the following technical scheme:
a water footprint method for calculating shale gas development comprises the following steps:
(1) collecting direct water consumption data of shale gas development: including fracturing fresh water consumption and drilling fluid fresh water consumption, and calculating direct water consumption for shale gas development, WD。
WD＝Wdrilling+Wfracturing
Wherein, WdrillingAnd WfracturingRespectively represents the drilling fresh water consumption and the fracturing fresh water consumption, and the unit m3A well.
(2) In combination with the structure of the shale gas well body, the consumption of the three raw materials which are most input in the shale gas development process is calculated according to American Petroleum institute API Spec 5CT casing and oil pipe specification and technical specification of operations before drilling in northeast Sichuan (Q/SH0020-2009), wherein the three raw materials are cement, steel and diesel oil, and the calculation method is as follows:
steel consumption:
wherein λ isiMass coefficient per unit length of i-th casing, in kg m-1；LiThe length of the ith layer of the sleeve is expressed in m, and the number of the layers is 4.
Cement consumption:
wherein D isiRepresents the outer diameter of the ith layer of casing in m; b isiRepresents the diameter of the ith bit, m; rhoiDenotes the density of the cement paste, g cm-3(ii) a And theta represents the proportion of cement in the cement paste.
Diesel oil consumption: coil＝L4×γ1+Lh/s×T×q×γ2+Vo×ρoX ζ; wherein, γ1Represents the hundred meter oil consumption coefficient of the well and has the unit of t 100m-1；L4Representing the depth of the shale gas well in m; s represents the length of each fracture in m; t represents the time required by each stage of fracturing and is unit h; q represents the number of fracturing trucks; gamma ray2Represents the fuel consumption coefficient of 1 fracturing truck, unit th-1；VoIndicating the amount of oil-based drilling fluid used, in m3；ρoDensity of diesel oil, unit t m-3(ii) a ζ represents an oil-water ratio.
(3) Retrieving relevant data according to life cycle processes of the three raw materials and establishing an environmental influence model thereof, and further calculating an indirect water footprint W for shale gas developmentI：
WI＝Wcement×Ccement+Wsteel×Csteel+Woil×Coil；
Wherein, Wcement、WsteelAnd WoilRespectively represent the life of cement, steel and diesel oil in unit massWater resource consumption in periodic process, unit m3t-1；Ccement、CsteelAnd CoilRespectively represents the amount of cement, steel and diesel oil consumed by the development of shale gas, and the unit t is t.
(4) Calculating the shale gas development total water footprint W according to the results of the steps (1) and (3)T。
WT＝WD+WI
Wherein, WDAnd WIRespectively representing direct and indirect water consumption in m 3A well.
(5) Relevant parameters of shale gas production zones were obtained from the american Energy Information Agency (EIA): the method comprises the steps of calculating the gas yield of a shale gas single well by using the shale gas technology recoverable amount, the gas field area success factor and the like, and further estimating the water consumption of the shale gas in unit volume.
Wherein Q represents the gas production per well in m 3/well; GIP represents the recoverable amount of shale gas in m3(ii) a A represents the area of the shale gas field in m2(ii) a Psi denotes the gas field area success factor; l represents horizontal well length in m; d represents the well spacing in m.
Water consumption per unit volume of shale gas:
wherein, WTRepresenting the water consumption of a single well.
(6) Calculating the water footprint of national shale gas development according to the annual output target in shale gas development planning released by the State energy agency:
WF＝Wu×Py
where WF represents the water footprint for national shale gas development in units of m3；PyRepresenting shale gas production in m3。
The invention has the beneficial effects that:
(1) from the perspective of life cycle, indirect influence on shale gas development brought by raw material investment is considered, and water resource consumption of shale gas development can be quantified systematically and comprehensively.
(2) Estimating the gas production rate of the shale gas well, calculating the gas production rate of a single well, quantifying the national water resource consumption of shale gas development according to the shale gas production targets in 2020 and 2030, and providing water-saving measures from the technical aspect according to the structure of water footprint so as to reduce the environmental impact of shale gas development.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The specific embodiments of the present invention are further described with reference to the accompanying drawings and technical solutions.
The invention discloses a water footprint method for calculating shale gas development, which comprises the following specific steps as shown in figure 1:
collecting direct water consumption data of shale gas development: including fracturing fresh water consumption and drilling fluid fresh water consumption, and calculating direct water consumption for shale gas development. Knowing the shale gas development process and the well body structure of the shale gas well, calculating the consumption of the three most input raw materials (cement, steel and diesel) in the shale gas development process according to American Petroleum institute API Spec 5CT (casing and oil pipe Specification) and technical Specification for pre-drilling operation in northeast Sichuan (Q/SH 0020-2009); and retrieving related data according to life cycle processes of the three raw materials, establishing an environmental influence model of the three raw materials, and further calculating an indirect water footprint of shale gas development. And calculating the total water footprint of the shale gas development according to the direct water consumption and the indirect water consumption.
Relevant parameters of shale gas production zones were obtained from the american Energy Information Agency (EIA): the method comprises the steps of shale gas technology recoverable amount, gas field area success factors and the like, so that the gas yield of a shale gas single well is calculated, and the water consumption of shale gas in unit volume is estimated. And calculating the water footprint of national shale gas development according to the yield target of shale gas development planning released by the national energy agency.
According to the research method, the embodiment aims at the release of the national energy agencyThe shale gas development planning (2016 & 2020), which realizes 300 billion cubic meters of shale gas production in 2020 and 800 & gt & lt 1000 billion cubic meters of shale gas production in 2030, and the total water consumption for single-well shale gas development is calculated to be 44400[ 9841; (28657,61397)]m3(ii) a Wherein the direct water consumption is 35000[ 9296; (20287,50966)]m3Indirect water consumption 10120[ 914; (8694,11675)]m3. To achieve the 2020 year shale gas yield goal, we estimate the water footprint of national shale gas development to be 13-20million m3The water footprint of the shale gas development is 36-66million m in 2030 years3。
Claims (1)
1. A water footprint method for calculating shale gas development is characterized by comprising the following steps:
(1) collecting direct water consumption data of shale gas development: including fracturing fresh water consumption and drilling fluid fresh water consumption, and calculating direct water consumption for shale gas development, WD；
WD＝Wdrilling+Wfracturing
Wherein, WdrillingAnd WfracturingRespectively represents the drilling fresh water consumption and the fracturing fresh water consumption, and the unit m3A well;
(2) in combination with the structure of the shale gas well body, the consumption of the three raw materials which are most input in the shale gas development process is calculated according to American Petroleum institute API Spec 5CT casing and oil pipe specification and technical specification of operations before drilling in northeast Sichuan (Q/SH0020-2009), wherein the three raw materials are cement, steel and diesel oil, and the calculation method is as follows:
Steel consumption:
wherein λ isiMass coefficient per unit length, in kgm, for the ith layer of casing-1；LiThe length of the ith layer of sleeve is expressed, and the unit m is 4 layers;
cement consumption:
wherein D isiRepresents the outer diameter of the ith layer of casing in m; b isiRepresents the diameter of the ith bit, m; rhoiDenotes the density of the cement paste, g cm-3(ii) a Theta represents the cement proportion in the cement paste;
diesel oil consumption: coil＝L4×γ1+Lh/s×T×q×γ2+Vo×ρoX ζ; wherein, γ1Represents the hundred meter oil consumption coefficient of the well and has the unit of t 100m-1；L4Representing the depth of the shale gas well in m; s represents the length of each fracture in m; t represents the time required by each stage of fracturing and is unit h; q represents the number of fracturing trucks; gamma ray2Represents the fuel consumption coefficient of 1 fracturing truck, unit t h-1；VoIndicating the amount of oil-based drilling fluid used, in m3；ρoDensity of diesel oil, unit t m-3(ii) a ζ represents an oil-water ratio;
(3) retrieving relevant data according to life cycle processes of the three raw materials and establishing an environmental influence model thereof, and further calculating an indirect water footprint W for shale gas developmentI：
WI＝Wcement×Ccement+Wsteel×Csteel+Woil×Coil；
Wherein, Wcement、WsteelAnd WoilRespectively represents the water resource consumption in the life cycle process of cement, steel and diesel oil of unit mass and unit m3t-1；Ccement、CsteelAnd CoilRespectively representing the amount of cement, steel and diesel oil consumed by shale gas development in unit t;
(4) Calculating the shale gas development total water footprint W according to the results of the steps (1) and (3)T；
WT＝WD+WI
Wherein, WDAnd WIRespectively representing direct and indirect water consumption in m3A well;
(5) obtaining relevant parameters of shale gas production areas from the united states energy information agency: calculating the gas yield of a shale gas single well, and further calculating the water consumption of shale gas in unit volume, wherein the shale gas technology comprises recoverable shale gas, gas field area success factors and the like;
wherein Q represents the gas production per well in m3A well; GIP represents the recoverable amount of shale gas in m3(ii) a A represents the area of the shale gas field in m2(ii) a Psi denotes the gas field area success factor; l represents horizontal well length in m; d represents well spacing in m;
water consumption per unit volume of shale gas:
wherein, WTRepresenting water consumption per well;
(6) calculating the water footprint of national shale gas development according to the annual output target in shale gas development planning released by the State energy agency:
WF＝Wu×Py
where WF represents the water footprint for national shale gas development in units of m3；PyRepresenting shale gas production in m3。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2431767A2 (en) * | 2010-09-17 | 2012-03-21 | Services Pétroliers Schlumberger | Dynamic subsurface engineering |
| CN110751422A (en) * | 2019-11-18 | 2020-02-04 | 大连理工大学 | Method for quantifying water footprint of coal produced by coal mine enterprises |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2431767A2 (en) * | 2010-09-17 | 2012-03-21 | Services Pétroliers Schlumberger | Dynamic subsurface engineering |
| CN110751422A (en) * | 2019-11-18 | 2020-02-04 | 大连理工大学 | Method for quantifying water footprint of coal produced by coal mine enterprises |
Non-Patent Citations (5)
| Title |
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| 姜小云;张庭婷;吴唯;: "基于生命周期分析的内蒙古自治区煤电水足迹研究", 煤化工, no. 02 * |
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