Unconventional perforation technology to achieve seabed "oil extraction"

Tech 2023-06-20 08:58:17 Source: Network

Results BroadcastReporter Wang Yanbin from our newspaperCorrespondent Ding Jing, Huang XiaolongThe bridge plug multi cluster perforation combination technology utilizes cables to transport the perforation gun string to the target layer, and achieves bridge plug sealing and perforation gun detonation in one operation through the ground operation system. For unconventional reservoirs with low reservoir permeability, it can effectively improve the reservoir transformation effect and shorten the construction period

Results Broadcast

Reporter Wang Yanbin from our newspaper

Correspondent Ding Jing, Huang Xiaolong

The bridge plug multi cluster perforation combination technology utilizes cables to transport the perforation gun string to the target layer, and achieves bridge plug sealing and perforation gun detonation in one operation through the ground operation system. For unconventional reservoirs with low reservoir permeability, it can effectively improve the reservoir transformation effect and shorten the construction period. Zhang Lin, a perforation engineering technology expert from Sinopec Jingwei Co., Ltd., emphasized to reporters that this is currently the mainstream unconventional perforation technology in onshore operations, but it is still the first time it has been applied in offshore construction wells.

It is understood that unconventional perforation is mainly used for later fracturing services. Zhang Lin said that for reservoirs like shale and tight sandstone, which have almost no pores like "Sharpening stone" and "iron plate", their permeability is very low, which means that the mobility of oil and gas in the reservoir is very poor. If coconut juice is compared to conventional oil, the juice squeezed from coconut meat is Unconventional oil.

Extracting oil from rocks requires more scientific methods. Zhang Lin told reporters that unconventional perforation is the process of using a perforating gun to open gaps in the formation at different positions based on the characteristics of the target layer, creating a channel for "oil extraction". This is known as "being able to penetrate". At the same time, before opening a layer, a sealing bridge plug needs to be installed below this position, which is equivalent to using a plug to block the channel, making it a relatively closed space, allowing pressure to effectively apply to this layer, thereby expanding the oil extraction channel and further transforming the reservoir, which is "firmly sealed". After the oil extraction channel meets the design requirements, this plug should also be able to dissolve in a timely manner, allowing for better oil flow out of the channel, which is called "good dissolution".

For the construction of Chengbei Xie891 well, the biggest difficulty is the impact of high salinity fracturing fluid on the bridge plug setting, which is whether the plug blocking the channel can be "sealed firmly" and "dissolved well". Huang Xiaolong, Deputy Manager of the Unconventional Perforation Engineering Department of Shengli Logging Company, believes that unlike on land, unconventional perforation is carried out offshore. Due to the high salt content of seawater, the corresponding fracturing fluid ratio has also changed, and the mineralization degree is about 10 times higher than on land. Under the same geological conditions, seawater fracturing fluid accelerates the dissolution rate of the bridge plug. Once the bridge plug dissolves in advance, it is like a cola bottle leaking gas, which not only seriously affects the fracturing effect, but also affects the oil testing and production of the entire reservoir.

In order to ensure that segmented fracturing is "sealed tightly" and oil testing and production are "dissolved well", Shengli Logging Company has established a special team responsible for organizing operations and arranging technical backbone to conduct on-site inspections on offshore platforms. Based on the first-hand data obtained from the survey and combined with the characteristics of unconventional offshore perforation construction, they optimized the design scheme of soluble bridge plugs, continuously tested and improved the selection of bridge plug materials, and developed the "Jingwei Zhurong" high salt resistance series high-temperature fully soluble bridge plugs suitable for seawater fracturing. They were successfully applied in the Chengbei Xie891 well, with a success rate of 100% in setting and effective sealing.

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