Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for recovering production of coalbed methane wells

A technology for coalbed methane wells and intervals, which is applied in chemical instruments and methods, earthwork drilling, wellbore flushing, etc., can solve problems such as difficult fast desorption of coalbed methane and inconspicuous performance of fracturing funnels, so as to reduce construction risks and Potential safety hazards, reduced demands, and stress-reducing effects

Active Publication Date: 2022-04-26
PETROCHINA COALBED METHANE +2
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following problems in the implementation process: a large amount of water is injected into the coal seam during the fracturing process, and after the construction is completed, it takes a long time to drain water and then produce
Although fractures are formed in the formation after fracturing, the fracturing funnels in the far wells are also not obvious, and the desorption of coalbed methane is also difficult to be carried out quickly.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking the engineering transformation of well M in H oilfield as the implementation object, the transformation is carried out by using the recovery technology of coalbed methane well. Well M is a coalbed methane well, the well depth of the producing layer is 580-586m, and the effective layer thickness is 6m. The inner diameter of the oil pipe is 62mm, the outer diameter of the oil pipe is 73mm, and the inner diameter of the casing is 157mm. The calculated volume of the oil casing annulus is 10.7m 3 . Before operation, prepare the working fluid required for construction, well flushing fluid A1, re-production stabilizing fluid B1, and penetrating fluid C1.

[0027] Agent A1: 5% HCl+0.1% imidazoline oleate+0.1% polyethylene glycol ether+0.1% butynyl alcohol, and the rest is water.

[0028] Components per 100gA1 dose:

[0029] Add 14.3 g of 35% HCl, 0.1 g of imidazoline oleate, 0.1 g of polyethylene glycol ether, 0.1 g of butynyl alcohol, and 85.4 g of water.

[0030] B...

Embodiment 2

[0043] Taking the engineering transformation of Well N in H Oilfield as the implementation object, the transformation is carried out by using the recovery process of coalbed methane wells. Well N is a coalbed methane well, the well depth of the producing layer is 614-618m, and the effective layer thickness is 4m. The inner diameter of the oil pipe is 62mm, the outer diameter of the oil pipe is 73mm, and the inner diameter of the casing is 139mm. The calculated volume of the oil casing annulus is 8.5m 3 . Before operation, prepare the working fluid required for construction, well flushing fluid A2, re-production stabilizing fluid B2, and penetrating fluid C2.

[0044]Agent A2: 3% HCl+0.1% butynyl alcohol+0.1% oleic acid imidazoline, the rest is water.

[0045] Components per 100gA2 dose:

[0046] Add 8.6 g of 35% HCl, 0.1 g of butynyl alcohol, 0.1 g of imidazoline oleate, and 91.2 g of water.

[0047] Agent B2: 5% xylitol + 10% methyl p-toluenesulfonate + 20% cetyl benzyl d...

Embodiment 3

[0062] Taking the engineering transformation of Well Q in H Oilfield as the implementation object, the transformation is carried out by using the recovery process of coalbed methane wells. Well Q is a coalbed methane well, the depth of the pay zone is 1184-1192m, and the effective zone thickness is 8m. The inner diameter of the oil pipe is 51mm, the outer diameter of the oil pipe is 60mm, and the inner diameter of the casing is 127mm. The calculated volume of the oil casing annulus is 14.2m 3 . Before operation, prepare the working fluid required for construction, well flushing fluid A3, re-production stabilizing fluid B3, and penetrating fluid C3.

[0063] Agent A3: 4% HCl+0.1% mercaptan+0.1% sodium dodecylsulfonate+0.1% diethylenetriamine, the rest is water.

[0064] Components per 100g A3 dose:

[0065] Add 11.5 g of 35% HCl, 0.1 g of mercaptan, 0.1 g of sodium dodecylsulfonate, 0.1 g of diethylenetriamine, and 88.2 g of water.

[0066] B3 agent: 5% sorbitol + 5% dimeth...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The application discloses a method for resuming production of a coalbed gas well, which solves the problems of large engineering quantity and long time consumption for resuming production of a coalbed gas well. The method comprises the following steps: firstly, injecting the re-production stabilizing liquid B agent into the coalbed methane well, the re-production stabilizing liquid B agent can stabilize the internal environment of the well layer and prolong the validity period of gas production; secondly, injecting liquid nitrogen into the coalbed methane well layer , the liquid nitrogen is vaporized after being added into the well formation, and its volume expands, which plays the role of drainage aid; again, alternately and repeatedly injects the re-production stabilizing liquid B agent and liquid nitrogen into the coalbed methane well formation; then, shuts down the well for a preset time; finally , open the well and drain fluid. The invention is implemented by injecting chemical materials into the coal bed gas well, which is beneficial to improve the permeability of the coal bed, reduce the pressure in the near-well zone, increase the seepage velocity of the coal bed gas, and prolong the validity period of the gas production operation. At the same time, it greatly reduces the engineering quantity of coalbed methane wells to resume production and shortens the engineering time.

Description

technical field [0001] The application relates to the field of coalbed methane exploitation, in particular to a method for resuming production of a coalbed methane well. Background technique [0002] Coalbed methane is a kind of unconventional natural gas with coal seam as source rock, reservoir and production layer, and its main occurrence state is adsorption state. The development of coalbed methane is of great significance to the utilization of clean energy, the prevention and control of coal mine gas hazards, and the construction of greenhouse gas emissions. my country is rich in coalbed methane resources, but progress in the field of coalbed methane development is slow. In recent years, in order to increase the output of coalbed methane wells, relevant researchers have been developing and innovating production stimulation technologies. At present, the main stimulation technologies for coalbed methane well exploitation include hydraulic fracturing, multi-component gas ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/16E21B21/00E21B33/13C09K8/506C09K8/508C09K8/52C09K8/86
CPCE21B43/16E21B43/168E21B43/006E21B21/00E21B33/13C09K8/52C09K8/5086C09K8/506C09K8/86
Inventor 王凤林蒋建勋冯堃路明昌黄勇傅伶俐季亮宋东斌
Owner PETROCHINA COALBED METHANE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com