CN110486005A - A method of shale gas well dessert layer for identification - Google Patents
A method of shale gas well dessert layer for identification Download PDFInfo
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- CN110486005A CN110486005A CN201810459499.0A CN201810459499A CN110486005A CN 110486005 A CN110486005 A CN 110486005A CN 201810459499 A CN201810459499 A CN 201810459499A CN 110486005 A CN110486005 A CN 110486005A
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- gas well
- shale gas
- shale
- target interval
- rock core
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The present invention relates to a kind of methods of shale gas well dessert layer for identification, which comprises the following steps: determines the mean temperature of shale gas well；Obtain the quality, parsing tolerance and parsing time of shale gas well target interval rock core；Determine the initial propagations coefficient of shale gas well target interval；Shale gas well dessert layer is identified according to the initial propagations coefficient of shale gas well.The present invention can fast and effectively instruct the interval of shale gas well fracturing, to realize the high yield of shale gas well.
Description
Technical field
The present invention relates to a kind of methods of shale gas well dessert layer for identification, belong to petroleum, geology, mining industry exploration and development
Technical field.
Background technique
Shale gas refers to that preservation is to be born from main body certainly in the argillaceous siltstoue of shale and sandwich-like rich in organic matter
The continuity gas reservoir of Chu Chengzang is stored at the gas accumulation in ultimate attainment close shale formation system with absorption and free state, belongs to
In Unconventional gas.Compared with conventional gas, the exploitation of shale gas has the advantages that production life of well is long and the production cycle is long,
This enables shale gas well chronically to produce gas with stable rate.But in shale gas exploration and development, need to shale well
Dessert layer is predicted that this has great importance in shale gas commercialization exploitation.
Traditional prediction technique mainly uses rock physics, log data, comprehensive or wide-azimuth 3D seismic data
The comprehensive dessert layer for carrying out shale gas evaluating reservoir and finding shale gas exploration and development.Or the spy that organises based on rammell
The dessert layer of the overall merits shale gas well different layers positions such as the rock-mechanics property of sign, live air content and rammell.However, by
The process complexity sentenced is studied shale gas dessert layer and is known in the prior art, accuracy is low, therefore is unfavorable for realizing shale
The high yield of gas.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of method of shale gas well dessert layer for identification, it can
The interval of shale gas well fracturing is instructed, fast and effectively to realize the high yield of shale gas well.
To achieve the above object, the present invention takes following technical scheme: a kind of side of shale gas well dessert layer for identification
Method, comprising the following steps: determine the mean temperature of shale gas well；Obtain quality, the resolution gas of shale gas well target interval rock core
Amount and parsing time；Determine the initial propagations coefficient of shale gas well target interval；Known according to the initial propagations coefficient of shale gas well
Other shale gas well dessert layer.
In a specific embodiment, the inlet temperature and outlet temperature for obtaining shale gas well wellhead slurry, determine shale
The mean temperature of gas well.
In a specific embodiment, formula based on the mean temperature of shale gas well is determined are as follows:
In formula, TmeanRepresent the mean temperature of shale gas well；TinRepresent the inlet temperature of shale gas well wellhead slurry, Tout
Represent the outlet temperature of shale gas well wellhead slurry.
In a specific embodiment, using the rock core of the solution closed shale gas well target interval of cucurbitula, and solution cucurbitula is put
It sets and is parsed in water-bath, the temperature for controlling water-bath is the mean temperature of shale gas well.
When in a specific embodiment, using the parsing tolerance and parsing of parsing metrical instrument measurement target interval rock core
Between.
In a specific embodiment, parsing metrical instrument is auto-manual draining water gathering of gas law shale gas coal bed gas scene solution
Inhale measuring device.
In a specific embodiment, it is carried out most according to the parsing tolerance of shale gas well target interval rock core and parsing time
Small square law straight line fitting obtains the fit slope of shale gas well target interval rock core.
In a specific embodiment, it determines and parses the time required for the fit slope of shale gas well target interval rock core
It is initial 0.5~2 hour.
In a specific embodiment, formula based on the initial propagations coefficient of shale gas well target interval is determined are as follows:
IDC=K/M (2)
In formula, IDC represents the initial propagations coefficient of shale gas well target interval, and K represents shale gas well target interval rock core
The parsing time be initial 0.5~2 hour corresponding fit slope, M represents the quality of shale gas well target interval rock core.
In a specific embodiment, target interval of the initial propagations coefficient value greater than 200 for determining shale gas well is sweet tea
Point layer.
The invention adopts the above technical scheme, which has the following advantages: the present invention can be determined by quantitative calculating
The initial propagations coefficient of shale gas well target interval, initial propagations coefficient can be as important in the exploration and exploitation of shale gas well
Evaluation parameter, the sweet tea of shale gas well can be intuitively, fast identified according to the initial propagations coefficient of shale gas well different layers section
Point layer, process is simple, accuracy is high, shale gas well fracturing can fast and be effectively instructed, to realize the height of shale gas well
It produces.
Other features and advantages of the present invention will be illustrated in the following description, also, partial becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
It, below will be to required in embodiment description for the clearer technical solution illustrated in the embodiment of the present invention
Attached drawing does simple introduction:
Fig. 1 is the flowage structure schematic diagram of a specific embodiment of the invention；
Fig. 2 is the structural schematic diagram of A rock core parsing tolerance and time relationship fitting in a specific embodiment of the invention；
Fig. 3 is the structural schematic diagram of B rock core parsing tolerance and time relationship fitting in a specific embodiment of the invention.
Specific embodiment
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to apply to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technical effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each feature in each embodiment and each embodiment in the present invention can be combined with each other,
It is within the scope of the present invention to be formed by technical solution.
As shown in Figure 1, the method for the gas well of shale for identification dessert layer proposed by the present invention, comprising the following steps:
1) according to the inlet temperature and outlet temperature of shale gas well wellhead slurry, the mean temperature of shale gas well is determined
Firstly, determine shale gas well, the inlet temperature and outlet temperature of wellhead slurry when obtaining shale gas well coring.So
Afterwards, according to the inlet temperature and outlet temperature according to wellhead slurry when coring, the mean temperature of shale gas well is determined.
Determine formula based on the mean temperature of shale gas well are as follows:
In formula, TmeanRepresent the mean temperature of shale gas well；TinRepresent the inlet temperature of shale gas well wellhead slurry, Tout
Represent the outlet temperature of shale gas well wellhead slurry.
2) quality, parsing tolerance and parsing time of shale gas well target interval rock core are obtained
When the rock core of shale gas well target interval reaches well head, rapid removal of core, and obtain the quality of rock core.It connects
, the rock core of shale gas well target interval is placed on rapidly closed in sealing device, and sealing device is placed into resolver
Middle parsing, meanwhile, the temperature for controlling resolver is the mean temperature of shale gas well.Shale gas is measured using parsing metrical instrument
The parsing tolerance of well target interval rock core and parsing time.And least square is carried out according to the parsing tolerance of rock core and parsing time
Method straight line fitting, to obtain the fit slope of shale gas well target interval rock core.Wherein it is determined that shale gas well target interval rock
The parsing time required for the fit slope of the heart is initial 0.5~2 hour.
In a preferred embodiment, it determines and parses the time required for shale gas well target interval rock core fit slope
It is initial 2 hours.
In a preferred embodiment, sealing device is solution cucurbitula.
In a preferred embodiment, resolver is water-bath.
In a preferred embodiment, parsing metrical instrument is auto-manual draining water gathering of gas law shale gas coal bed gas scene
Desorb measuring device.
3) the initial propagations coefficient of shale gas well target interval is determined
Determine formula based on the initial propagations coefficient of shale gas well target interval are as follows:
IDC=K/M (2)
In formula, IDC represents the initial propagations coefficient of shale gas well target interval, and K represents shale gas well target interval rock core
The parsing time be initial 0.5~2 hour corresponding fit slope, M represents the quality of shale gas well target interval rock core.
4) shale gas well dessert layer is identified according to the initial propagations coefficient of shale gas well.
When carrying out pressure break to shale gas well, if initial propagations coefficient value is lower than 100 destination layer in selection shale gas well
The gas diffusion velocity of Duan Jinhang pressure break, the target interval is poor, then the actual production of the target interval does not reach expected effect
Fruit, this is low with the initial propagations coefficient of the target interval direct relation.If selecting initial propagations coefficient value in shale gas well
Target interval more than or equal to 100 and less than or equal to 200 carries out pressure break, and the gas diffusion velocity of the target interval is general, then should
The actual production of target interval still fall flat.If initial propagations coefficient value is greater than in selection shale gas well
200 target interval carries out pressure break, and the gas diffusion velocity of the target interval is preferable, then the actual production of the target interval can
Achieve the desired results (as shown in table 1).Target interval of the initial propagations coefficient value greater than 200 for determining shale gas well is dessert
Layer, selects the dessert layer to carry out pressure break, and yield can achieve the desired results.Therefore, according to the initial propagations system of shale gas well
Number can effectively identify the dessert layer of shale gas well.
1 IDC value of table corresponds to shale gas well target interval gas diffusion velocity
A specific embodiment is set forth below
In the present embodiment, according to the burnt page of Fuling Prefecture's coke masonry dam, coring well is selected.It is selected in the different depth of coring well
Take A rock core and B rock core.The quality for measuring A rock core is 3.145 kilograms, and the quality of B rock core is 2.810 kilograms.Obtain two differences
The A rock core and B rock core of depth respectively (such as scheme by the parsing tolerance in initial 2 hours and the relationship fitting a straight line of parsing time
2, shown in Fig. 3).It is 345.7 that the parsing time for determining A rock core, which is initial 2 hours corresponding fit slopes, determines the solution of B rock core
It is 1043.6 that the analysis time, which is initial 2 hours corresponding fit slopes,.
Least square line fitting is carried out according to the parsing tolerance of coring well A rock core and parsing time, obtains coring well A
Formula based on the fit slope of rock core are as follows:
yA=345.7xA+31.60 (3)
In formula, yARepresent the parsing tolerance of coring well A rock core, xARepresent the parsing time of coring well A rock core.
Least square line fitting is carried out according to the parsing tolerance of coring well B rock core and parsing time, obtains coring well B
Formula based on the fit slope of rock core are as follows:
yB=1043.6xB+75.26 (5)
In formula, yBRepresent the parsing tolerance of coring well B rock core, xBRepresent the parsing time of coring well B rock core.
Determine formula based on the initial propagations coefficient of coring well A rock core interval are as follows:
IDCA=KA/MA=345.7/3.145=109.92 (7)
In formula, IDCARepresent the initial propagations coefficient of coring well A rock core interval, KARepresent the parsing time of coring well A rock core
For initial 2 hours corresponding fit slopes, MARepresent the quality of coring well A rock core.
Determine formula based on the initial propagations coefficient of coring well B rock core interval are as follows:
IDCB=KB/MB=1043.6/2.810=371.39 (8)
In formula, IDCBRepresent the initial propagations coefficient of coring well B rock core interval, KBRepresent the parsing time of coring well B rock core
For initial 2 hours corresponding fit slopes, MBRepresent the quality of coring well B rock core.
A rock is determined respectively according to the initial propagations coefficient of the initial propagations coefficient of coring well A rock core interval and B rock core interval
The fracturing effect of central layer section and the fracturing effect of B rock core interval.And the fracturing effect of B rock core interval is obtained better than A rock core interval
The effect of pressure break.In fact, if selection is in A rock core interval pressure break, actual production does not reach when carrying out pressure break to the coring well
To effect, this is low with the initial propagations coefficient of A rock core interval direct relation.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of method of shale gas well dessert layer for identification, which comprises the following steps:
Determine the mean temperature of shale gas well；
Obtain the quality, parsing tolerance and parsing time of shale gas well target interval rock core；
Determine the initial propagations coefficient of shale gas well target interval；
Shale gas well dessert layer is identified according to the initial propagations coefficient of shale gas well.
2. a kind of method of shale gas well dessert layer for identification according to claim 1, which is characterized in that obtain shale
The inlet temperature and outlet temperature of gas well mouth mud, determine the mean temperature of shale gas well.
3. a kind of method of shale gas well dessert layer for identification according to claim 2, which is characterized in that determine shale
Formula based on the mean temperature of gas well are as follows:
In formula, TmeanRepresent the mean temperature of shale gas well；TinRepresent the inlet temperature of shale gas well wellhead slurry, ToutIt represents
The outlet temperature of shale gas well wellhead slurry.
4. a kind of method of shale gas well dessert layer for identification according to claim 1, which is characterized in that using sealing
The rock core of the closed shale gas well target interval of device, and sealing device is placed in resolver and is parsed, control resolver
Temperature be shale gas well mean temperature.
5. a kind of method of shale gas well dessert layer for identification according to claim 4, which is characterized in that using parsing
Metrical instrument measures parsing tolerance and the parsing time of target interval rock core.
6. a kind of method of shale gas well dessert layer for identification according to claim 5, which is characterized in that parsing metering
Instrument is auto-manual draining water gathering of gas law shale gas coal bed gas site desorption measuring device.
7. a kind of method of shale gas well dessert layer for identification according to claim 1, which is characterized in that according to shale
The parsing tolerance of gas well target interval rock core and parsing time carry out least square line fitting, obtain shale gas well destination layer
The fit slope of Duan Yanxin.
8. a kind of method of shale gas well dessert layer for identification according to claim 7, which is characterized in that determine shale
The parsing time required for the fit slope of gas well target interval rock core is initial 0.5~2 hour.
9. a kind of method of shale gas well dessert layer for identification according to claim 8, which is characterized in that determine shale
Formula based on the initial propagations coefficient of gas well target interval are as follows:
IDC=K/M (2)
In formula, IDC represents the initial propagations coefficient of shale gas well target interval, and K represents the solution of shale gas well target interval rock core
The analysis time is initial 0.5~2 hour corresponding fit slope, and M represents the quality of shale gas well target interval rock core.
10. a kind of method of shale gas well dessert layer for identification according to claim 1, which is characterized in that determine page
Target interval of the initial propagations coefficient value of rock gas well greater than 200 is dessert layer.
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| CN114427453A (en) * | 2020-09-09 | 2022-05-03 | 中国石油化工股份有限公司 | Shale gas well dessert layer identification method, equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114427453A (en) * | 2020-09-09 | 2022-05-03 | 中国石油化工股份有限公司 | Shale gas well dessert layer identification method, equipment and storage medium |
| CN114427453B (en) * | 2020-09-09 | 2024-04-09 | 中国石油化工股份有限公司 | Shale gas well dessert layer identification method, equipment and storage medium |
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