堵老裂缝压新裂缝重复压裂技术

老井重复压裂是石油开采领域面临的重大技术课题。分析了低渗透油藏高含水期油田生产特点，提出了一种新的重复压裂技术，即堵老缝压新缝重得压裂，阐述了其技术原理和配套工艺技术；研究开发一种满足性能要求的老裂缝堵剂。该套技术在长庆油油田应用取得了十分显的经济效果，证明了重复压裂可以形成新裂缝。

HYDRAULIC RE-FRACTURING TECHNIQUE FOR FORNING NEW FRACTURES WHILE BLOCKING OLD FRACTURS

Hydraulic re-fracturing treatment technology is a significant topic for old producers. After analysising production characteristics of the low-permeability reservoir with high water-cut period, this paper put forward a new re-fracturing technology, i.e. re-fracturing for forming new fractures while blocking old ones. At first, the technique principle and corresponding treatment method of the hydraulic re-fracturing are systematically described. Then, a new blocking agent, which is used to re-fracturing treatment and met the corresponding properties needs, is studied and developed. The new treatment technology was performed in Changqing Oilfield, and a very remarkable success was made. These results demonstrate it is possible for hydraulic re-fracturing to create new fractures in directions different from initial ones.