The Daily Oil Increase of 52 Wells in Shuang229 Block of Liaohe Oilfield is 40.9 Tons
As of December 15, the CCUS pilot test of Shuang229 block in Liaohe Oilfield has completed the conversion work of 22 gas injection Wells, injecting 78,000 tons of carbon dioxide in stages, completing 95% of the annual injection volume. Corresponding to these injection Wells, 52 production Wells have been shown to increase production. Compared with before gas injection, the total oil increase was 40.9 tons per day, and the cumulative oil increase in the stage was 15,000 tons.
Since the exploration and development of Shuang229 block, it has been relying on natural energy exploitation, and the natural decline rate reaches more than 40% at the highest, mainly because it can not be replenished by water injection. Therefore, Liaohe Oilfield decided to carry out carbon dioxide flooding test in this block by repeatedly selecting the way of energy replenishment. At present, the double 229 block is building a carbon dioxide cycle injection station, and the carbon dioxide purification treatment function is also under construction. After all the operation, it can realize the local circulation of carbon dioxide in the closed state, greatly reducing the amount of purchased carbon dioxide and reducing the test cost.
Block Shuang229, located in Dawa area of Panjin City, Liaoning Province, is a typical ultra-low permeability lithologic reservoir. In August 2021, the Double 229 CCUS pilot pilot project was launched, becoming one of the "four major and six small" CCUS projects of petrochina. In March 2022, the "carbon drive carbon storage Pilot test plan for ultra-low permeability reservoir of Sha-1 Section of Shuang229 Wa128 well Area" was approved by the joint stock company, the overall deployment of 11 injection and 39 production, the used reserves of 3.58 million tons, which is expected to increase the recovery rate by 32.5% compared with the original method, and the accumulated storage of 2.36 million tons of carbon dioxide at the end of the stage.