A new round of sea trials of combustible ice in the South China Sea has been completed.
Experts said: the completion of the test area is expected to be between 2028 and 3030
CNOOC Research Institute announced on July 15 that the “domestic-made independent natural gas hydrate drilling and logging technology and equipment sea trial task” supported by the national key research and development plan “Ocean Gas Hydrate Trial Production Technology and Technology” will be launched in the South my country Sea. The successful completion of a new round of sea trials is a major advancement in my country's marine gas hydrate drilling and logging technology.
What did the sea trial do?
has no meaning?
In particular, the public is more concerned about the natural gas hydrate called "flammable ice", how far is it from commercial application?
A person from the CNOOC Research Institute gave a brief interpretation.
Prior to this, gas hydrates have been produced in five places and ten times in the world.
"my country has done three of them." Li Qingping, Chief Technology Officer of the Technology R&D Center of CNOOC Research Institute, introduced that these three trial productions are experimental and exploratory. They store related resources through logging, core, and trial production. Preliminary evaluation and verification of status and trial production process.
She introduced that natural gas hydrates mainly occur in the bottom of the South China Sea, which is 300 meters deep, with the characteristics of deep water and shallow burial.
Water depth means that exploration and development operations are more difficult; shallow burial means that it is easy to encounter risks such as gas stacks, landslides, and shallow gas.
Coupled with the special problems of poor diagenesis and strong heterogeneity of the reservoir, many challenges are presented to the exploration and development technology.
On the other hand, due to the lack of drilling and logging technology and equipment for sea hydrates in China for a long time, relevant operations can only be carried out by hiring and renting foreign professionals and equipment at high prices.
"Our country's marine hydrate while drilling and sampling mainly rely on foreign equipment." Li Qingping said that the sea trial operation "is to change this situation" to verify the reliability of domestically made deepwater technology and equipment. The self-development of natural gas hydrate technology and equipment has gained valuable experience.
In this sea trial, the CNOOC Research Institute relied on the domestically made “Offshore Oil 708 Deepwater Engineering Survey Ship”, the domestically made deepwater drilling system, and the new generation of logging while drilling tools. In June this year, the CNOOC Research Institute carried out a period of time in the South China Sea with a water depth of 1758 meters. Two weeks of subsea wellsite surveys, drilling operations, and logging while drilling operations of two hydrate evaluation wells were taken firsthand, including natural gamma, resistivity, acoustic wave, well diameter, well temperature, topography and geomorphology, etc. Data to successfully complete the target task.
"This sea trial operation broke the two records of my country's marine hydrate autonomous drilling operation depth and operation water depth in one fell swoop, and obtained high-quality logging data with the advantages of low cost and high efficiency. Logging operations provide a template.” Mi Lijun, chairman of the CNOOC Research Institute, commented.
He Yufa, a drilling and completion expert at CNOOC Research Institute, explained that the acquisition of natural gamma, resistivity, acoustic waves, well temperature and other data by drilling exploration wells is still an important part of resource evaluation.
This is a process of using formation information to "find sweet spots", such as acoustic logging. This time the upgrade from monopole to quadrupole has higher accuracy and more information; through gamma + resistivity + acoustic waves, It can identify natural gas hydrates and shallow gas, and so on.
"Finding reservoir sweet spots" is obviously a step further than exploratory resource assessment.
Zhou Shouwei, an academician of the Chinese Academy of Engineering, believes that the success of this sea trial has enabled CNOOC to have a complete set of localized technology and full-process operation capabilities for ship-drilling-logging-core-online analysis and testing, marking that my country has become the world In the three countries that have independently mastered this technology, "my country's marine gas hydrate drilling and logging technology has entered a new era of domestic independence."
So, how far is it from the commercial application of natural gas hydrates?
Li Qingping said that the development and utilization of natural gas hydrate requires a long process of basic theoretical research and engineering technology research. Engineering technology research is roughly divided into exploratory trial mining, experimental trial mining, pre-production, pilot testing, industrialization, etc. Several stages to realize natural gas hydrate technically recoverable and economically recoverable.
"We are now between the second and third stages." She revealed that the current time point for industrialization research and judgment is between 2028 and 2030. By then, a pilot zone will be built and the path and scale of industrialization will be explored.
(Science and Technology Daily, Beijing, July 15th)