On June 16th, the author learned from Platform 8 of Dagang Shale Oil's official website that the Bohai Sea drilling coiled oil pipeline team took 7.5 days to complete 7 operations of 3 ultra-deep wells with high quality, with a cumulative intake of more than 45,000 meters, and the construction efficiency increased by 26.7%. , Refreshing the fastest construction speed since the company undertook the coiled oil pipeline business.At present, the business volume of coiled tubing drilling in the Bohai Sea has increased by 89.5% year-on-year, marking that the company's coiled tubing business has entered the fast lane of large-scale and efficient development.

Coiled tubing technology is the core high-efficiency technology of the oil and gas industry.Replacing the traditional segmented structure with an integrated flexible pipe column, a single length can reach several kilometers. It has comprehensive advantages such as pressure operation, continuous circulation, and rapid lifting and lowering. It can reduce equipment investment, compress the operating cycle, and reduce construction risks. At the same time, it can effectively control operating costs and significantly improve construction efficiency. It is known as a “universal operating machine”.At present, coiled tubing technology has become an important means for workover and production increase operations of international oil service companies, and it is a powerful tool for workover operation technology.

At present, the technology has changed from “special” operations to daily operations. It is widely used in drilling, workover, completion, oil (gas) production, logging, reservoir transformation, and oil and gas collection and transportation. It has performed well in various well types such as ultra-deep wells, and has gradually expanded to the field of refining and chemical industry.With its flexible passability and pressure-bearing operation characteristics, the technology can penetrate deep into unconventional reservoirs such as shale oil and dense oil and gas, accurately implement complex processes such as segmented fracturing and fine testing, and provide key technical guarantees for the efficient development of oil and gas fields.

Since this year, Bohai Drilling has focused on the core links of coiled tubing operations and innovatively built a “management—governance—maintenance” full-process management system.The system deeply integrates the three core measures of "Guanjing people follow up throughout the process,'red work clothes + white coats’ joint attack, and maintenance before and after construction", and adopts the ”preparation—construction—acceptance—summary" full-chain closed-loop management model to promote the seamless integration of key processes and provide strong support for the improvement of operation quality and efficiency.

In the operation of the whole process management system, the pipe well person became the “exclusive nanny” of a single well, and followed up the whole process from construction preparation to completion summary and re-order, and the success rate of the operation increased by 12% year-on-year.The construction cycle of complex wells has been shortened by more than 20%, and the comprehensive cost has been reduced by 27%.In terms of pipe management, the company independently developed fatigue life monitoring procedures, combined with “internal injection and external coating” maintenance and all-element numbering to establish accounts, so that the service life of the pipe is extended by 16%, the failure rate is zero, and the maintenance efficiency is increased by 45%.For shale oil platform wells, Bohai Drilling adopts the “1+3” operation mode to realize that the main equipment is in place at once, and the construction efficiency is significantly improved.

“With the help of coiled tubing, the production capacity was put into operation 6.5 days earlier than expected."Zhang Qian, resident engineer of Platform 8 on the official website, said.

At present, Bohai Drilling coiled tubing technology has formed five major technology series, and has been popularized and applied more than 30 conventional processes and 10 characteristic processes. It has been applied 4,089 times in Dagang, Changqing, Sichuan and other markets, helping multiple well positions to refresh construction records.The company's key research projects on the intelligence, automation and informationization of coiled oil pipelines have been implemented on-site, and they are gradually realizing remote one-click start-up, dynamic remote transmission of data, real-time monitoring and control in the background, and intelligent troubleshooting of faults, and continuously improving the level of unconventional oil and gas development services.