碳酸盐岩油藏深度酸压技术研究及应用

Research and application of deep acid fracturing technology in carbonate reservoir

碳酸盐岩储层酸压改造的目的是沟通远端的储集体,提高酸压裂缝长度和酸液有效作用距离是提高酸压措施效果的关键。对裂缝相对不发育的致密储层,开展了以控制裂缝高度为主的深度酸压技术研究;对裂缝发育的储层,开展了前置液加粉陶段塞降滤、大规模前置液酸压等深度酸压工艺技术的研究,强化降滤和造缝能力,减小或消除多裂缝的影响,提高酸压穿透深度。以上各种深度酸压技术在碳酸盐岩裂缝油藏中取得了很好的应用效果。

The aim of using acid fracturing technology in carbonate rock is to link up the accumulated reservoirs in distal end. So increasing fracture length of acid fracturing and effective distance of live acid is a key to raise acid fracturing production rate. The acid fraturing reformation is conducted for the reservoirs of fracture development. We researched the deep acid fracturing technology, which is main to control fracturing heigth. The technology includes the decreasing filtration of the preflush which is added the minute ceramsites and a large scale acid-fracturing in which the preflush is used. The decreasing filtration capability and width generation capability are intensified, which reduces and removes the fissured effect and increases the penetration depth of acid fracturing treatment. We apply these technologies to carbonate-fracture reservoirs and acquire obvious effection.