Tahe Oilfield, a subsidiary of Northwest Oilfield Company of China Petroleum & Chemical Corporation, is located in the northern part of Tarim Basin in Xinjiang.
Blocking oil wells with colloidal asphaltenes is a major challenge in Tahe Oilfield. There are 12 wells in S86 block and 8 oil wells, of which 5 wells have serious blockage of asphaltenes. There are two ways to solve the traditional plugging. One is that the pumping machine uses the annulus annulus to inject the asphalt dispersant regularly. The limitation is that the dosing depth is limited, only within 4000m. Second, Wax tool string combination of regular regular wells, scraping tube, the limitation is the tubing attached to a large amount of colloidal asphaltene quality, scraping tool string easy to hang card, or even broken off the wire to form a well in the fish.
Tahe Oil Production Plant 3 high asphaltene oil well shaft pump with long tail pipe anti-wellbore blocking technology recently successfully tested. After the application of TH10403X, TH10402 and TH10404 three pilot wells located in S86 block, the normal continuous production time of oil wells was extended from the previous 157 days to 364 days with a total increase of 1,376 tons.
In order to find a more effective way, technical staff such as Liu Yi, deputy director of Tahe Oilfield Third Oilfield Development Research Institute and other technical personnel through the enhancement of refinement of oil production technology and efficient screening of asphalt dispersant indoors, put forward the rod pump plus long tail pipe anti-gum Asphalt blocking the technical scheme of the wellbore, deepening the rod pump tail pipe, over the precipitation point of the gummy bitumen. This technology, on the one hand, can occur when asphaltene blocks the wellbore, it can directly use dilute oil plugging agent to wash the wells in reverse circulation and facilitate the effective removal of asphaltene blockage; on the other hand, Short operating time and low cost. At the same time, during normal production, high efficiency bitumen dispersant is added regularly to the annulus of the oil casing to prevent asphaltene from blocking the wellbore, so as to avoid the well treatment well, save the cost of measures and improve the oil production aging.
"The successful application of this new technology has found a new way for Tahe Oilfield to solve the problem of blocked asphaltene from oil wells and has objective economic benefits." Liu Yi, deputy director of the Third Oilfield Development Research Institute of Tahe Oilfield, calculated such an account : "According to the CNOOC 3099.4 yuan per ton, count three wells cumulative production efficiency of 426.5 million yuan, according to a reduction of one well per well within a year workover calculation three wells save costs 2060000 yuan, while the input cost of only 2458300 Yuan, its direct benefit is 3.8667 million yuan "
Blocking oil wells with colloidal asphaltenes is a major challenge in Tahe Oilfield. There are 12 wells in S86 block and 8 oil wells, of which 5 wells have serious blockage of asphaltenes. There are two ways to solve the traditional plugging. One is that the pumping machine uses the annulus annulus to inject the asphalt dispersant regularly. The limitation is that the dosing depth is limited, only within 4000m. Second, Wax tool string combination of regular regular wells, scraping tube, the limitation is the tubing attached to a large amount of colloidal asphaltene quality, scraping tool string easy to hang card, or even broken off the wire to form a well in the fish.
Tahe Oil Production Plant 3 high asphaltene oil well shaft pump with long tail pipe anti-wellbore blocking technology recently successfully tested. After the application of TH10403X, TH10402 and TH10404 three pilot wells located in S86 block, the normal continuous production time of oil wells was extended from the previous 157 days to 364 days with a total increase of 1,376 tons.
In order to find a more effective way, technical staff such as Liu Yi, deputy director of Tahe Oilfield Third Oilfield Development Research Institute and other technical personnel through the enhancement of refinement of oil production technology and efficient screening of asphalt dispersant indoors, put forward the rod pump plus long tail pipe anti-gum Asphalt blocking the technical scheme of the wellbore, deepening the rod pump tail pipe, over the precipitation point of the gummy bitumen. This technology, on the one hand, can occur when asphaltene blocks the wellbore, it can directly use dilute oil plugging agent to wash the wells in reverse circulation and facilitate the effective removal of asphaltene blockage; on the other hand, Short operating time and low cost. At the same time, during normal production, high efficiency bitumen dispersant is added regularly to the annulus of the oil casing to prevent asphaltene from blocking the wellbore, so as to avoid the well treatment well, save the cost of measures and improve the oil production aging.
"The successful application of this new technology has found a new way for Tahe Oilfield to solve the problem of blocked asphaltene from oil wells and has objective economic benefits." Liu Yi, deputy director of the Third Oilfield Development Research Institute of Tahe Oilfield, calculated such an account : "According to the CNOOC 3099.4 yuan per ton, count three wells cumulative production efficiency of 426.5 million yuan, according to a reduction of one well per well within a year workover calculation three wells save costs 2060000 yuan, while the input cost of only 2458300 Yuan, its direct benefit is 3.8667 million yuan "
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