CN110424937A - A kind of coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing - Google Patents
A kind of coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing Download PDFInfo
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- CN110424937A CN110424937A CN201910634771.9A CN201910634771A CN110424937A CN 110424937 A CN110424937 A CN 110424937A CN 201910634771 A CN201910634771 A CN 201910634771A CN 110424937 A CN110424937 A CN 110424937A
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The present invention relates to a kind of coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, including prefabricated extraction wellhole, and fracturing unit is prefabricated, nitrogen fracturing work, five steps such as carbon dioxide gas phase pressure break and data summarization analysis.One aspect of the present invention construction is convenient, construction operation the degree of automation, Construction control precision are high, energy conversion rate is high, construction technology versatility is good, on the other hand the present invention is when implementing storey increase design, while can carry out exact formulas calculating, separately fracturing work effect can accurately be detected, improve nitrogen and CO 2 medium dosage and the control precision using pressure in fracturing work, to greatly improve the working efficiency and quality of the storey increase design operation of coal bed gas stripper well, and effectively reduces and be constructed into.
Description
Technical field
The present invention relates to a kind of coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, belong to cbm exploration
Development technique field.
Background technique
China's coal gas industry starts from the establishment and operation of 1996 Nian Zhonglian coal bed gas companies.The blue-flame coal seam of Jincheng in 2003
Gas company breaks through direction and the paces for having guided Coalbed Methane In China in 30 mouthfuls of coal bed gas pilot production well yields of Pan Zhuan block.It arrives
The end of the year 2014, China have completed more than 15000 mouthfuls of CBM Drilling.But China's cbm development still suffers from two great skills
Art challenge.First is that the effective storey increase design technology of hyposmosis coal seam reservoirs, second is that the storey increase design technology of production failure stripper well.
The geology and technical background for forming this situation is, China's coal reservoir fracture system is universal relatively low and the coal bed gas well that is then formed
Yield is generally relatively low, and average individual well produces 700m daily3/ d or so；Second is that the high-yield well of early stage steps into yield failure period, daily output
Lower than 300m3The old well quantity of/d gradually increases, at least 5000 mouthfuls estimated at present, and stripper well transformation has in Coalbed Methane In China industry
There are exploration and test meaning.
Currently when carrying out secondary storey increase design to coal bed gas stripper well, common technology has conventional hydraulic pressure break, nitrogen
Foam fracturing, nitrogen foam pressure break, active water-nitrogen are with injection pressure is split, guanidine glue laminated is split, slippery water pressure break etc., these common technologies
There are advantage and disadvantage, it is on the one hand big to coal seam pollution secondary pollution；On the other hand it is difficult to form complex fracture, effect of increasing production list
One.
Therefore it is directed to this status, there is an urgent need to a kind of completely new coal bed gas stripper well storey increase design techniques, to meet coal
Layer gas exploits requirements of one's work.
Summary of the invention
The object of the invention, which is that, overcomes above-mentioned deficiency, provides a kind of coal bed gas low yield well nitrogen-carbon dioxide and combines and changes
Make method for increasing.
To achieve the above object, the present invention is to be achieved through the following technical solutions:
S1, prefabricated transformation wellhole, according to coal bed gas well geological tectonic conditions to be rebuilt and history mining data, to the operation
Well carries out through wash well operations；
S2, pre- control equipment and material, it is prefabricated according to data such as the coal seam thickness of operation well, hole diameter, Seam Roof And Floor lithology
Equipment and material needed for nitrogen fracturing work and carbon dioxide gas phase pressure break；
S3, nitrogen fracturing work, i.e., to operation well coal seam section carry out nitrogen fracturing work, and ground in face of underground crack into
Row micro-seismic monitoring；
S4, carbon dioxide gas phase pressure break after completing S3 step nitrogen fracturing work, carry out carbon dioxide gas phase pressure to coal seam
It splits, and carries out micro-seismic monitoring in face of underground crack on ground；
S5, data summarization analysis after completing S4 step, to the crack quantity of S3, S4 step acquisition, width, depth and are prolonged
It stretches bearing data to be analyzed, if fall flat, repeats S3, S4.
Further, the coal bed gas well to be rebuilt in the S1 step is failure well, blocks well, is in stripper well any
It is a kind of.
Further, in the S2 step, the equipment and material include nitrogen pump truck, high-pressure carbon dioxide explosion
Pipe, liquid carbon dioxide etc..
Further, in the S3 step, in the nitrogen fracturing work, fracturing fluid used is nitrogen, is no longer made
With any other medium.
Further, in the S3 step, in the nitrogen fracturing work, nitrogen temperature is coal seam temperature ± 3 DEG C,
Nitrogen discharge capacity is 200-400m3/ min, nitrogen use level calculation method are as follows:
Wherein: Dt: nitrogen use level, unit m3；
H: coal is thick, unit m；
R: the pressure break radius of influence, unit m；
Further, in the S3 step, the monitoring base station of microseism is evenly distributed in centered on well head, radius 150-
In the circle of 250m, micro-seismic monitoring base station number is no less than 8, and two neighboring monitoring base station straight line spacing is not less than 80m.
Further, in the S4 step, carbon dioxide burst pressure is 80-300MPa, liquid carbon dioxide meter
Calculation mode are as follows:
Wherein:
Carbon dioxide usage amount, units/kg；
dg: high pressure explosion bore, unit m, value 0.089m；
H: coal is thick, unit m；
Liquid carbon dioxide density, units/kg/m3。
Further, in the S4 step, when carbon dioxide gas phase pressure break, carbon dioxide temperature is -5 DEG C -5 DEG C, and real
When applying gas phase pressure break, the time is 20-40 milliseconds, and it is 10-60 minutes that the dwell time is stood after explosion.
Further, adjacent when repeating the pressure break gas phase pressure break of S3 step and S4 step in the S5 step
Twice in the pressure break gas phase pressure break of S3 step and S4 step, nitrogen and carbon dioxide that when rear primary pressure break gas phase pressure break uses
Amount is 0.5-2.5 times of the previous pressure break gas phase pressure break nitrogen used and amount of carbon dioxide.
One aspect of the present invention construction is convenient, and construction operation the degree of automation, Construction control precision are high, and energy conversion rate is high,
Construction technology versatility is good, and more traditional fracture technology construction cost is low, small to coal seam secondary pollution.On the other hand the present invention
When implementing storey increase design, while can carry out exact formulas calculating, separately fracturing work effect can accurately be detected, be mentioned
Nitrogen and CO 2 medium dosage and the control precision used in high fracturing work, change to effectively overcome traditional pressure break
Phenomena such as making technical controlling low precision, the wasting of resources, to greatly improve the work of coal bed gas stripper well storey increase design operation
Efficiency and quality, and effectively reduce construction cost and construction operation risk.
Detailed description of the invention
Fig. 1 is the method for the present invention flow diagram；
Fig. 2, Fig. 3, Fig. 4 are that coal bed gas daily output curve synoptic diagram after preceding and transformation is transformed in same coal seam gas stripper well.
Specific embodiment
Embodiment 1
For certain failure well, the well mouth coordinate: X=200-4008116.77m Y=38408278.37m H=
922.66m；Precracking coverage 70m, coal seam thickness 7.6m.
As illustrated in fig. 1 and 2, the coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, including following step
It is rapid:
S1, prefabricated extraction wellhole, according to coal bed gas well geological tectonic conditions to be rebuilt and history mining data, to the well into
Row through wash well operations.
S2, pre- control equipment and material, well coal seam thickness 7.6m, hole diameter 0.124m, coal seam temperature is 15 DEG C, roof
For sandstone, bottom plate is Sandy Silt, prepares nitrogen pump truck, CO 2 high pressure pipe, liquid nitrogen, liquid carbon dioxide etc.；
S3, nitrogen fracturing work carry out nitrogen fracturing work, nitrogen use level 58466m to the well3, nitrogen discharge capacity is
350m3/ min, nitrogen discharge temperature be 14-17 DEG C, the micro-seismic monitoring base station mode of arranging exhibits be centered on well head, radius be
In 200m circle, micro-seismic monitoring base station number 8, two neighboring base station linear distance 153m；
S4, carbon dioxide gas phase pressure break carry out explosion, carbon dioxide burst pressure to coal seam section using CO 2 high pressure pipe
Power is 120MPa, and CO 2 high pressure intraluminal fluid state carbon dioxide usage amount is 47.5kg；
S5, data summarization analysis after completing S4 step, to the crack quantity of S3, S4 step acquisition, width, depth and are prolonged
Bearing data analysis is stretched, meets coal bed gas well volume increase extraction technique requirement, this volume increase construction terminates, and removes relevant device and transfer
Carry out coal bed gas extraction operation.
Nitrogen use level calculation formula in S3 step are as follows:
Wherein: Dt: nitrogen total amount, unit m3；
H: coal is thick, unit m；
R: the pressure break radius of influence, unit m, R=70m；
Carbon dioxide usage amount calculation formula in S4 step are as follows:
Wherein:
Carbon dioxide usage amount, units/kg；
dg: high pressure explosion bore, unit m, value 0.089m；
H: coal is thick, unit m；
Liquid carbon dioxide density, units/kg/m3；
Embodiment 2
For blocking well in conjunction with certain, the well mouth coordinate: X=200-4009495.33 Y=19677698.30 H=
927.10m；Precracking coverage 75m；Coal seam thickness is 6.5m.
As shown in figures 1 and 3, the coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, including following step
It is rapid:
S1, prefabricated extraction wellhole, according to coal bed gas well geological tectonic conditions to be rebuilt and history mining data, to the well into
Row through wash well operations.
S2, pre- control equipment and material, well coal seam thickness 6.5m, hole diameter 0.124m, coal seam temperature is 16 DEG C, roof
For sandstone, bottom plate is mud stone.Prepare nitrogen pump truck, CO 2 high pressure pipe, liquid nitrogen, liquid carbon dioxide etc.；
S3, nitrogen fracturing work carry out nitrogen fracturing work, nitrogen use level 57403m to the well3, nitrogen discharge capacity is
400m3/ min, nitrogen discharge temperature be 15-18 DEG C, the micro-seismic monitoring base station mode of arranging exhibits be centered on well head, radius be
In 250m circle, micro-seismic monitoring base station number 10, two neighboring base station linear distance 154m；
S4, carbon dioxide gas phase pressure break carry out explosion, carbon dioxide burst pressure to coal seam section using CO 2 high pressure pipe
Power is 185MPa, and CO 2 high pressure intraluminal fluid state carbon dioxide usage amount is 40.66kg；
S5, data summarization analysis after completing S4 step, to the crack quantity of S3, S4 step acquisition, width, depth and are prolonged
Bearing data analysis is stretched, meets coal bed gas well volume increase extraction technique requirement, this volume increase construction terminates, and removes relevant device and transfer
Carry out coal bed gas extraction operation.
Nitrogen use level calculation formula in S3 step are as follows:
Wherein: Dt: nitrogen total amount, unit m3；
H: coal is thick, unit m；
R: the pressure break radius of influence, unit m, R=70m；
Carbon dioxide usage amount calculation formula in S4 step are as follows:
Wherein:
Carbon dioxide usage amount, units/kg；
dg: high pressure explosion bore, unit m, value 0.089m；
H: coal is thick, unit m；
Liquid carbon dioxide density, units/kg/m3；
Embodiment 3
For certain failure well, the well mouth coordinate: X=200-4008524.40 Y=19677479.17 H=
916.00m；Precracking coverage 80m, coal seam thickness 6.7m.
As shown in Figure 1 and Figure 4, the coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, including following step
It is rapid:
S1, prefabricated extraction wellhole, according to coal bed gas well geological tectonic conditions to be rebuilt and history mining data, to the well into
Row through wash well operations.
S2, pre- control equipment and material, well coal seam thickness 6.7m, hole diameter 0.124m, coal seam temperature is 18 DEG C, roof
For Sandy Silt, bottom plate is argillaceous sandstone.Prepare nitrogen pump truck, CO 2 high pressure pipe, liquid nitrogen, liquid carbon dioxide
Deng；
S3, nitrogen fracturing work carry out nitrogen fracturing work, nitrogen use level 67321m to the well3, nitrogen discharge capacity is
300m3/ min, nitrogen discharge temperature be 17-20 DEG C, the micro-seismic monitoring base station mode of arranging exhibits be centered on well head, radius be
In 250m circle, micro-seismic monitoring base station number 8, two neighboring base station linear distance 191m；
S4, carbon dioxide gas phase pressure break carry out explosion, carbon dioxide burst pressure to coal seam section using CO 2 high pressure pipe
Power is 120MPa, and CO 2 high pressure intraluminal fluid state carbon dioxide usage amount is 41.9kg；
S5, data summarization analysis after completing S4 step, to the crack quantity of S3, S4 step acquisition, width, depth and are prolonged
Bearing data analysis is stretched, meets coal bed gas well volume increase extraction technique requirement, this volume increase construction terminates, and removes relevant device and transfer
Carry out coal bed gas extraction operation.
Nitrogen use level calculation formula in S3 step are as follows:
Wherein: Dt: nitrogen total amount, unit m3；
H: coal is thick, unit m；
R: the pressure break radius of influence, unit m, R=70m；
Carbon dioxide usage amount calculation formula in S4 step are as follows:
Wherein:
Carbon dioxide usage amount, units/kg；
dg: high pressure explosion bore, unit m, value 0.089m；
H: coal is thick, unit m；
Liquid carbon dioxide density, units/kg/m3；
One aspect of the present invention construction is convenient, and construction operation the degree of automation, Construction control precision are high, and energy conversion rate is high,
Construction technology versatility is good, and on the other hand the present invention is when implementing storey increase design, while can carry out exact formulas calculating, separately
Fracturing work effect can accurately be detected, improve nitrogen and CO 2 medium dosage in fracturing work and use pressure
Control precision and effectively dropped to greatly improve the working efficiency and quality of coal bed gas stripper well storey increase design operation
Low construction cost and difficulty of construction.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of coal bed gas low yield well nitrogen-carbon dioxide joint transformation method for increasing, it is characterised in that: the coal bed gas is low
Produce well nitrogen-carbon dioxide joint transformation method for increasing the following steps are included:
S1, prefabricated transformation wellhole, according to coal bed gas well geological tectonic conditions to be rebuilt and history mining data, to the operation well into
Row through wash well operations；
S2, pre- control equipment and material, according to the prefabricated nitrogen of the data such as the coal seam thickness of operation well, hole diameter, Seam Roof And Floor lithology
Equipment and material needed for fracturing work and carbon dioxide gas phase pressure break；
S3, nitrogen fracturing work carry out nitrogen fracturing work to operation well coal seam section, and micro- in face of the progress of underground crack on ground
Seismic monitoring；
S4, carbon dioxide gas phase pressure break after completing S3 step nitrogen fracturing work, carry out carbon dioxide gas phase pressure break to coal seam,
And micro-seismic monitoring is carried out in face of underground crack on ground；
S5, data summarization analysis, after completing S4 step, crack quantity, width, depth and extension side that S3, S4 step are obtained
It is analyzed to data, if fall flat, repeats S3, S4.
2. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: coal bed gas well to be rebuilt in the S1 step is failure well, blocking well, any one in stripper well.
3. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S2 step, equipment and material include nitrogen pump truck, high-pressure carbon dioxide blasting cartridge, liquid nitrogen, liquid two
Carbonoxide etc..
4. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S3 step, in the nitrogen fracturing work, fracturing fluid used is nitrogen.
5. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S3 step, in the nitrogen fracturing work, nitrogen temperature is coal seam temperature ± 3 DEG C, and nitrogen discharge capacity is
200-400m3/ min, nitrogen use level calculation formula are as follows:
Wherein: Dt: nitrogen use level, unit m3；
H: coal is thick, unit m；
R: the pressure break radius of influence, unit m.
6. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S3 step, the monitoring base station of microseism is evenly distributed in centered on well head, the circle of radius 150-250m
On, micro-seismic monitoring base station number is no less than 8, and two neighboring monitoring base station straight line spacing is not less than 80m.
7. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S4 step, carbon dioxide burst pressure is 80-300MPa, liquid carbon dioxide dosage calculation are as follows:
Wherein:
Carbon dioxide usage amount, units/kg；
dg: high pressure explosion bore, unit m, value 0.089m；
H: coal is thick, unit m；
Liquid carbon dioxide density, units/kg/m3。
8. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S4 step, when carbon dioxide gas phase pressure break, carbon dioxide temperature is -5 DEG C -5 DEG C, and implements gas phase pressure break
When, the time is 20-40 milliseconds, and it is 10-60 minutes that the dwell time is stood after explosion.
9. a kind of coal bed gas low yield well nitrogen according to claim 1-carbon dioxide joint transformation method for increasing, feature
Be: in the S5 step, when repeating the pressure break gas phase pressure break of S3 step and S4 step, the adjacent step of S3 twice and
In the pressure break gas phase pressure break of S4 step, the nitrogen and amount of carbon dioxide that when rear primary pressure break gas phase pressure break uses are previous
0.5-2.5 times of the pressure break gas phase pressure break nitrogen used and amount of carbon dioxide.
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| CN112377166A (en) * | 2020-12-14 | 2021-02-19 | 西南石油大学 | Shale oil reservoir nitrogen-assisted carbon dioxide fracturing and development integrated method |
| CN112377166B (en) * | 2020-12-14 | 2021-11-09 | 西南石油大学 | Shale oil reservoir nitrogen-assisted carbon dioxide fracturing and development integrated method |
| US11371328B1 (en) | 2020-12-14 | 2022-06-28 | Southwest Petroleum University | Integrated method for nitrogen-assisted carbon dioxide fracturing and development of shale oil reservoirs |
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