底水油藏堵水技术研究

对于长庆油田低渗砂岩底本油藏，适当封堵底水可抑制底水锥进，恢复水淹油井的正常产能。研制出3种堵剂配方，通过模拟试验研究封堵作用与水驱采收率的关系，采用数值模拟方法判断底水水淹油井的出水层位和水锥体半径大小，根据施工井区地质特征优选堵水工艺方法、堵剂配方、确定堵水施工参数。现场应用底水油藏堵水技术的经济效益显著。

A research for water shutoff in the bottom water reservoir

In the light of Changqing oil field with the features of lower permeability and bottom water, three ingredients of blocking off agents have been developed, and three matching operation tests have been carried out in the work field, at the same time, some tough technical problems, such as the further perfection of the ingredients of blocking off agents, optimization of water blocking off technical operations, the choice of operating sites and oil wells, the judgments of water producing layer after water conning and the radius of the water conning body, the confirmations of intensity and parameter of water blocking off, have been studied comprehensively in the paper.Whether the tests are successful or not, oil reservoir potential analysis, judgment of bottom water conning, rationality of choosing the blocking agents, reliability of the operation techniques and on site facilities will play an important role during the whole process, and the successfully tested wells have offered remarkable social economic benefits.