CN104612649A - Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing - Google Patents

Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing Download PDF

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Publication number
CN104612649A
CN104612649A CN201410662690.7A CN201410662690A CN104612649A CN 104612649 A CN104612649 A CN 104612649A CN 201410662690 A CN201410662690 A CN 201410662690A CN 104612649 A CN104612649 A CN 104612649A
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China
Prior art keywords
fracturing
pressure
truck
low
permeability
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CN201410662690.7A
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Chinese (zh)
Inventor
曹运兴
田林
周丹
曹永恒
贾猛
石玢
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HENAN ARK NEW ENERGY Co Ltd
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HENAN ARK NEW ENERGY Co Ltd
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Priority to CN201410662690.7A priority Critical patent/CN104612649A/en
Publication of CN104612649A publication Critical patent/CN104612649A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

The invention discloses a method and device for fracturing and permeability and yield increasing of a coal-bed gas well of a low-pressure and low permeability reservoir by means of chemical permeability increasing and relates to the field of petroleum and natural gas exploration and development. Filling in a fracture of the low-pressure and low permeability reservoir is mainly made of carbonate and is decomposed when the filling encounters with acid, so that an original fracture channel is released, a microfracture and a main fracture channel are communicated under the action of hydraulic fracturing, the permeability of the reservoir is increased, and the purposes of fracturing and permeability increasing are realized. The method and device are suitable for primary fracturing of coal-bed gas wells which are not fractured or coal-bed gas wells with natural cracks existing on the bottoms and is also suitable for refracturing of coal-bed gas wells which are fractured but low in yield.

Description

The low pressure and low permeability saturating reservoir coal bed gas well chemistry anti-reflection method for increasing of anti-reflection pressure break and equipment thereof
Technical field
The present invention relates to oil and gas exploration and development field, provide a kind of low pressure and low permeability saturating reservoir coal bed gas well chemistry anti-reflection method for increasing of anti-reflection pressure break and equipment thereof.
Background technology
Coal bed gas, as a kind of important unconventional gas resource, receives the attention of countries in the world day by day.Coal bed gas major part is stored in the inner surface of matrix of coal hole with adsorbed state, only have seldom amount to be present in hugger and other cracks in free state, the output of coal bed gas must through desorb, diffusion and flow event.
Mineralogical composition common in coal reservoir fracture charges has marcasite, pyrite and calcite.In China's Carboniferous-permian, north China coal measures, calcite filling is the most general, all belongs to carbonate material.
Microfissure in coal seam reservoirs, the gentle spalling gap in cleat are that in coal thermal evolution process, coal bed gas concentrates the product generating and discharge with intermittence in a large number; External crack is a kind of fissure system formed due to tectonic stress effect in coal seam reservoirs and adjacent country rock.They provide possible passage for fluid in the outside loss of coal bed gas and country rock enters among coal seam reservoirs.In crack, the existence of filling material seriously hinders the seepage flow of methane gas in cleat in coal.Decompose filling material in crack, release coal seam preexisting crack passage is the effective ways that hyposmosis coal seam reservoirs improves permeability.
Summary of the invention
For the problems referred to above, the invention provides a kind of low pressure and low permeability saturating reservoir coal bed gas well nitrogen foam fracturing process.
For achieving the above object, the present invention includes following steps:
(1) according to pressing crack construction design, equipment and the materials such as active water, technical hydrochloric acid such as main fracturing car, fracturing blender truck, tank truck, sand tank car, measuring truck is equipped with;
(2) coal bed gas well installs 350 type fracture well heads, and equipment enters job site, and high-low pressure pipeline connects;
(3) pressure testing; Shut well head main valve, to 35MPa that builds the pressure continuously such as ground high pressure line, well head, thread, unions, continue not sting for 5 minutes Lou for qualified;
(4) pressure break; With main fracturing unit truck, the fracturing fluid high pressure with 3% concentration technical hydrochloric acid is injected reservoir;
(5) open flow returns row.
Present invention also offers the equipment of the anti-reflection method for increasing of a kind of low pressure and low permeability saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, it is characterized in that, comprise tank truck, sand tank car, fracturing blender truck, measuring truck, fracturing car and high pressure pipe joint, described tank truck is connected with fracturing blender truck respectively by pipeline with sand tank car, described fracturing blender truck is connected with fracturing car by pipeline, described fracturing car is connected with high pressure pipe joint by pipeline, and described high pressure pipe joint is extended to shaft bottom along the borehole wall by well head.
Further, described fracturing blender truck is connected with measuring truck respectively by holding wire with described fracturing, is monitored the working condition of fracturing blender truck and fracturing car by measuring truck.
Further, described tank truck and fracturing car are more than 3.
Beneficial effect is:
1, carbonate material is utilized to meet the chemical property of hydrochloric acid decomposition, 3% technical hydrochloric acid is added in fracturing fluid, decompose the carbonate components material of filling in the saturating reservoir preexisting crack of low pressure and low permeability, carbon dioxide gas and preexisting crack passage, increase reservoir energy while improving permeability, reach the anti-reflection object of pressure break.
2, coal seam reservoirs preexisting crack filling material is based on carbonate material, and chemical anti-reflection fracturing technique is that 3% technical hydrochloric acid can decomposing carbonate material to reservoir implantation concentration, dredging reservoir preexisting crack.
3, chemical anti-reflection fracturing technique utilizes original fracturing effect to form a large amount of microfissure, with the communication of main crack passage after microcrack is formed, greatly increases reservoir permeability.
4, the carbon dioxide that the technical hydrochloric acid of 3% concentration is formed after carbonate material in decomposition reservoir to a certain degree can increase reservoir energy, plays driving effect to coal bed gas extraction.
5, fracturing forms main crack passage in coal seam, and the original microfissure in coal seam of effect release that chemistry is anti-reflection is linked up by fracturing effect and main crack passage, forms complicated Fracture Networks, increases low permeability reservoir gas infiltration lane.
Accompanying drawing explanation
Fig. 1 is equipment connection structure schematic diagram of the present invention.
Detailed description of the invention
The invention provides a kind of low pressure and low permeability saturating reservoir coal bed gas well nitrogen foam fracturing process.
The present invention includes following steps:
(1) according to pressing crack construction design, equipment and the materials such as active water, technical hydrochloric acid such as main fracturing car, fracturing blender truck, tank truck, sand tank car, measuring truck is equipped with;
(2) coal bed gas well installs 350 type fracture well heads, and equipment enters job site, and high-low pressure pipeline connects;
(3) pressure testing; Shut well head main valve, to 35MPa that builds the pressure continuously such as ground high pressure line, well head, thread, unions, continue not sting for 5 minutes Lou for qualified;
(4) pressure break; With main fracturing unit truck, the fracturing fluid high pressure with 3% concentration technical hydrochloric acid is injected reservoir;
(5) open flow returns row.
Present invention also offers the equipment of the anti-reflection method for increasing of a kind of low pressure and low permeability saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, it is characterized in that, comprise tank truck, sand tank car, fracturing blender truck, measuring truck, fracturing car and high pressure pipe joint, described tank truck is connected with fracturing blender truck respectively by pipeline with sand tank car, described fracturing blender truck is connected with fracturing car by pipeline, described fracturing car is connected with high pressure pipe joint by pipeline, and described high pressure pipe joint is extended to shaft bottom along the borehole wall by well head.
Further, described fracturing blender truck is connected with measuring truck respectively by holding wire with described fracturing, is monitored the working condition of fracturing blender truck and fracturing car by measuring truck.
Further, described tank truck and fracturing car are more than 3.

Claims (4)

1. the anti-reflection method for increasing of the low pressure and low permeability saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, is characterized in that, comprise the following steps:
(1) according to pressing crack construction design, equipment and the materials such as active water, technical hydrochloric acid such as main fracturing car, fracturing blender truck, tank truck, sand tank car, measuring truck is equipped with;
(2) coal bed gas well installs 350 type fracture well heads, and equipment enters job site, and high-low pressure pipeline connects;
(3) pressure testing; Shut well head main valve, to 35MPa that builds the pressure continuously such as ground high pressure line, well head, thread, unions, continue not sting for 5 minutes Lou for qualified;
(4) pressure break; With main fracturing unit truck, the fracturing fluid high pressure with 3% concentration technical hydrochloric acid is injected reservoir;
(5) open flow returns row.
2. one kind adopts the equipment of the anti-reflection method for increasing of the low pressure and low permeability as claimed in claim 1 saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, it is characterized in that, comprise tank truck, sand tank car, fracturing blender truck, measuring truck, fracturing car and high pressure pipe joint, described tank truck is connected with fracturing blender truck respectively by pipeline with sand tank car, described fracturing blender truck is connected with fracturing car by pipeline, described fracturing car is connected with high pressure pipe joint by pipeline, and described high pressure pipe joint is extended to shaft bottom along the borehole wall by well head.
3. the equipment of the anti-reflection volume increase of a kind of low pressure and low permeability according to claim 2 saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, it is characterized in that, described fracturing blender truck is connected with measuring truck respectively by holding wire with described fracturing, is monitored the working condition of fracturing blender truck and fracturing car by measuring truck.
4. the equipment of the anti-reflection volume increase of a kind of low pressure and low permeability according to claim 3 saturating reservoir coal bed gas well anti-reflection pressure break of chemistry, it is characterized in that, described tank truck and fracturing car are more than 3.
CN201410662690.7A 2014-11-18 2014-11-18 Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing Pending CN104612649A (en)

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CN201410662690.7A CN104612649A (en) 2014-11-18 2014-11-18 Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing

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CN201410662690.7A CN104612649A (en) 2014-11-18 2014-11-18 Method and device for fracturing and permeability and yield increasing of coal-bed gas well of low-pressure and low permeability reservoir by means of chemical permeability increasing

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104989362A (en) * 2015-07-20 2015-10-21 辽宁工程技术大学 Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction
CN105134159A (en) * 2015-07-02 2015-12-09 西南石油大学 High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs
CN105863571A (en) * 2016-05-06 2016-08-17 延安大学 Shale gas horizontal well operation device and method based on pressure oscillation
CN106368733A (en) * 2016-10-21 2017-02-01 山东科技大学 Gas-bearing coal mass hydrofracture and acidification combined strengthening anti-reflection assessment method
CN109594964A (en) * 2019-01-25 2019-04-09 西安石油大油气科技有限公司 A kind of volume increase of oil gas field with "nine squares" aerodynamic force deep penetration composite deblocking process and device

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CN102852508A (en) * 2012-08-23 2013-01-02 陕西延长石油(集团)有限责任公司研究院 Liquid CO2 fracturing technology for shale gas well
CN103074047A (en) * 2012-12-31 2013-05-01 山西域方天然气开采技术有限公司 Fracturing agent and fracturing method of coalbed methane horizontal well
CN203035175U (en) * 2013-01-24 2013-07-03 成都宏天电传工程有限公司 Oilfield exploitation fracturing machine unit
CN103924955A (en) * 2014-04-21 2014-07-16 陕西延长石油(集团)有限责任公司研究院 Shale gas well CO2 and slickwater mixing fracturing technology
CN204252998U (en) * 2014-11-18 2015-04-08 河南方舟新能源股份有限公司 The equipment of the anti-reflection volume increase of the low pressure and low permeability saturating reservoir coal bed gas well anti-reflection pressure break of chemistry

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CN102852508A (en) * 2012-08-23 2013-01-02 陕西延长石油(集团)有限责任公司研究院 Liquid CO2 fracturing technology for shale gas well
CN103074047A (en) * 2012-12-31 2013-05-01 山西域方天然气开采技术有限公司 Fracturing agent and fracturing method of coalbed methane horizontal well
CN203035175U (en) * 2013-01-24 2013-07-03 成都宏天电传工程有限公司 Oilfield exploitation fracturing machine unit
CN103924955A (en) * 2014-04-21 2014-07-16 陕西延长石油(集团)有限责任公司研究院 Shale gas well CO2 and slickwater mixing fracturing technology
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105134159A (en) * 2015-07-02 2015-12-09 西南石油大学 High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs
CN105134159B (en) * 2015-07-02 2016-03-23 西南石油大学 A kind of efficient acid fracturing method being applicable to fracture-cavity type carbonate reservoir
CN104989362A (en) * 2015-07-20 2015-10-21 辽宁工程技术大学 Coal seam air injection expansion secondary permeability improvement method adopted after liquid CO2 blasting and used for promoting gas extraction
CN108150141A (en) * 2016-05-06 2018-06-12 延安大学 A kind of shale gas horizontal well operational method based on pressure oscillation
CN108266162B (en) * 2016-05-06 2021-03-16 延安大学 Shale gas horizontal well operation method based on pressure oscillation
CN108150140B (en) * 2016-05-06 2021-03-16 延安大学 Shale gas horizontal well operation device based on pressure oscillation
CN105863571B (en) * 2016-05-06 2018-01-16 延安大学 A kind of shale gas horizontal well operational method based on pressure oscillation
CN108150140A (en) * 2016-05-06 2018-06-12 延安大学 A kind of shale gas horizontal well apparatus for work based on pressure oscillation
CN105863571A (en) * 2016-05-06 2016-08-17 延安大学 Shale gas horizontal well operation device and method based on pressure oscillation
CN108266162A (en) * 2016-05-06 2018-07-10 延安大学 A kind of shale gas horizontal well operational method based on pressure oscillation
CN108561110A (en) * 2016-05-06 2018-09-21 延安大学 A kind of shale gas horizontal well operational method
CN108150141B (en) * 2016-05-06 2021-03-16 延安大学 Shale gas horizontal well operation method based on pressure oscillation
CN108561110B (en) * 2016-05-06 2021-03-16 延安大学 Shale gas horizontal well operation method
CN106368733B (en) * 2016-10-21 2017-08-11 山东科技大学 A kind of coal seam with gas hydraulic fracturing is with being acidified combined reinforced anti-reflection appraisal procedure
CN106368733A (en) * 2016-10-21 2017-02-01 山东科技大学 Gas-bearing coal mass hydrofracture and acidification combined strengthening anti-reflection assessment method
CN109594964A (en) * 2019-01-25 2019-04-09 西安石油大油气科技有限公司 A kind of volume increase of oil gas field with "nine squares" aerodynamic force deep penetration composite deblocking process and device

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