Three major technological innovations for Shengli shale oil to achieve strategic breakthroughs
Recently, a news that "the shale oil of Shengli Oilfield has achieved a strategic breakthrough" has attracted attention at home and abroad. According to the news, at present, Shengli Jiyang shale oil is the first batch of reported and predicted oil in place of 458 million tons, which has the conditions for comprehensive exploration and development. Oil and gas resources have always been an indispensable and important energy material for industry and people's livelihood. It is understood that shale oil refers to the petroleum resources stored in the tiny pores of shale layers. As an unconventional oil and gas resource, its reserves are second only to coal.
A reporter from Science and Technology Daily learned that the shale oil developed in Shengli Oilfield is buried at a depth of over 3,000 meters, with a temperature of over 170°C, high pressure, and a storage space smaller than a human hair. Process technologies such as drilling and fracturing pose challenges. Wang Xuejun, a senior expert at Shengli Oilfield, told the Science and Technology Daily reporter that the strategic breakthrough of Shengli Jiyang shale oil benefited from three major cognitive innovations and technological progress:
They have innovated and formed the optimal evaluation technology for shale oil, revealing the true face of shale oil's "hidden place"; the excellent and fast drilling technology with the synthetic-based drilling fluid system as the core makes the depth of 3,300 meters underground and the horizontal section of more than 2,000 meters. The multi-scale combined fracture network fracturing technology allows shale oil to flow out on the artificially manufactured millimeter-scale "highway", achieving breakthroughs in shale oil exploration and development.
There is no precedent to follow, to find the "hiding place" of underground kilometer shale oil
Continental rifted basins are one of the most important types of petroleum-bearing basins in the world, with unique petroleum geological features. About 230 Mesozoic and Cenozoic continental extensional fault-depression basins with different characteristics are distributed in the eastern continent and offshore of my country, which is the largest concentrated distribution area of continental hydrocarbon-bearing basins in the world, and the Jiyang Depression is a typical representative.
Since the "Twelfth Five-Year Plan", relying on the national 973, major special projects and key key research projects of Sinopec, Shengli Oilfield has developed the basis for the "reservoir, oil-bearing, mobility and compressibility" of organic-rich shale in the Jiyang fault depression lake basin Important progress has been made in research and technological breakthroughs, and in the geological understanding of shale oil in continental fault-depression basins and supporting technologies.
At the Shengli Oilfield Exploration and Development Research Institute, a reporter from Science and Technology Daily saw a shale oil sample extracted from more than 3,000 meters underground: a transparent glass bottle filled with half a bottle of black crude oil, which was completely different from other bright yellow crude oil. Compared with the developed shale oil at home and abroad, mainly light oil, Shengli shale oil is new in age, deeply buried, relatively low in maturity, and thick in oil. This also means that there is no international precedent for similar shale oil, and a series of key technologies need to be overcome. In April 2018, Shengli Oilfield established a shale oil project team to promote the integration of shale oil geology and engineering, and multi-disciplinary collaborative operations.
For the first time, they proposed a plan for the division of continental shale lithofacies, which solved the problem of geological prediction of shale lithofacies in continental rifted basins. Formed a multi-scale characterization method for shale micro-reservoir space, established a development model of reservoir space assemblage, and pointed out the law of shale oil enrichment and breakthrough direction in faulted basins; established a series of geological evaluation and process technologies for shale oil in continental faulted basins, Supporting the exploration and development practice has achieved a strategic breakthrough in Jiyang shale oil.
In the shale oil flow simulation conducted by the key laboratory of shale oil in Shengli Oilfield, the reporter saw that shale oil saturated in nano-scale and micro-scale pores of shale can seep from micro-fractures. Behind this appearance is the reservoir space development model of the Jiyang shale oil continental multi-level pore-fracture network established by them, revealing the true face of the "hiding place" of shale oil thousands of meters underground.
High-tech blessing, "build roads and bridges" for the outflow of shale oil
Just recently, there was another good news about the progress of shale oil exploration and development in Shengli Jiyang: the peak daily oil production of Well Fanyeping 1 reached 171 tons, setting the highest daily production record for a single well of shale oil in China. The creation of new records is inseparable from the blessing of high technology. They have initially formed a comprehensive geological evaluation and development optimization technology for shale oil. Aiming at the characteristics of deep burial, high temperature, high pressure, and well-developed fractures in Jiyang shale oil, a three-run wellbore structure, oil-based drilling fluid, rotary steering application, PDC bit + hydraulic oscillator speed increase, and managed pressure drilling have been preliminarily formed. etc. to promote the technology. Among them, synthetic-based drilling fluid solves technical problems such as high temperature and leakage, and achieves new breakthroughs in shale oil exploration and development.
They also created the combined fracture network fracturing technology for shale oil horizontal wells for the first time, forming artificial complex fracture networks several kilometers underground, "building roads and building bridges" for the flow of shale oil. Ten years of sharpening a sword. At present, Shengli shale oil has made two major strategic breakthroughs: more than 20 vertical and inclined shale oil wells, 90% of which can produce more than 1,000 tons of shale oil; High first birth, high cumulative birth. According to preliminary estimates, the total oil and gas resources in the Jiyang Depression have increased by more than 40%.
Kong Fanqun, assistant to the general manager of Sinopec Group Corporation, executive director and secretary of the Party Committee of Shengli Petroleum Administration Co., Ltd., and representative of the oilfield branch, said that at present, Shengli Oilfield is tackling key problems to develop longer horizontal section, multi-layer, three-dimensional development technology, innovative application of "well" It is expected to increase the proven geological reserves of shale oil by 100 million tons during the "14th Five-Year Plan" period, and build a production capacity of 1 million tons. The realization of beneficial development under the oil price of USD/barrel has made new contributions to consolidate the foundation of domestic production and ensure national energy security.
Article source: Science and Technology Daily
Author: Wang Yanbin
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