Abstract On May 3, the reporter learned from China National Offshore Oil Corporation (hereinafter referred to as CNOOC) that the company's self-developed rotary guide system Wellaeder and Drilling Logging System recently completed the offshore operation of a well in Bohai. This marks China's oil and gas...
On May 3, the reporter learned from China National Offshore Oil Corporation (hereinafter referred to as CNOOC) that the company's self-developed rotary guide system Wellaeder and Drilling Logging System recently completed the offshore operation of a well in Bohai. This indicates that China has broken the international monopoly in the field of directional drilling and logging while drilling in oil and gas fields, and can independently complete the mining requirements of offshore “clusters” and complex oil and gas layers, which is expected to significantly reduce the comprehensive cost of domestic oil and gas field development.

Oil and gas field development has always been like a “calculation problem” of aging and cost, that is, how to complete drilling services with the lowest cost and the fastest speed in the case of known underground oil and gas reservoir locations? In other words, if you want to mine “cheap and cheap” oil and gas resources, you must use the least number of wells to complete the largest range of reserves, and achieve the shortest drilling cycle with the least number of times of drilling. In the face of this problem that must be “calculated,” oil companies have chosen directional drilling technology that can “horizontal” travel in the formation.

Unlike general drilling operations, directional drilling operations do not allow the drill bit to “straight” the target layer. Instead, the drill bit is required to drill in the depth of the formation at a designed slope until it hits an underground reservoir with a depth of several kilometers. ". At present, more than 40% of directional wells in the world are drilled using a rotary guide system. The advantage is that it can control the drilling direction in the well in real time, and realize the trajectory adjustment of the drilling tool similar to the “3D version of Snake”. The target formation in the “three-dimensional” area – even a 0.2 m diameter drill bit can be run horizontally or diagonally in a 0.7 m thin oil layer, enabling a long-distance operation of “shoring” movement of 1000 m. This precision guidance is of great value in reducing development costs and maximizing the development of oil and gas fields.

The rotary guiding system can complete the operation in the underground several kilometers, and it is inseparable from the "navigation guidance" of the logging while drilling system. The logging while drilling system can feed down the underground geological data of “drilling along the way” to the ground at any time, and the logging engineer can complete the instant information processing and command communication, which is equivalent to adding “clairvoyary eye” to the downhole equipment. The two systems work side by side, can realize directional rotary drilling of the whole well, adjust the well trajectory in real time, and measure the underground environmental parameters, which can greatly improve the operation efficiency and reduce the engineering risk. It is the ultra-deep water, horizontal well and large displacement well. The “handcuffs” of directional well operations with equal difficulty.

However, due to the difficulty of research and development, these two technologies have been monopolized by three oilfield technology service companies in the United States for many years. According to the global workload statistics, these two technologies brought considerable income to related companies in 2014. In 2008, with the support of the “National 863 Program”, CNOOC Oilfield Services Co., Ltd., a holding company of CNOOC, began to independently develop two systems of rotary steerable drilling and logging while drilling. After arduous exploration, it finally broke through the technical bottleneck. Formed a trademark, system technology and equipment system with independent intellectual property rights. In the operation of the Bohai Sea, the two systems completed the 813-meter directional well operation and successfully hit three targets of 1613.8 meters, 2023.28 meters and 2179.33 meters. The maximum well inclination was 49.8° and the minimum target center distance was 2.1 meters. The system has the ability to work offshore.

Li Yong (microblogging), CEO and president of China Oilfield Services Co., Ltd., said that in recent years, the company has continued to increase investment in science and technology, and a large number of independent scientific and technological achievements have emerged. The success of this rotary steerable drilling and logging while drilling combined with offshore operations indicates that the company has become the world's fourth and the first domestic company to have both technologies. In the future, the company will focus on the industrialization and application of two technologies to meet the urgent needs of China's petroleum industry for high-end technology. At the same time, it will also provide a foothold for China's oil companies to “go global” to participate in the international high-end oilfield technology service market competition.

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