塔河油田SX2井火成岩地层化学固结堵漏技术

Chemical Consolidation Plugging Technology in SX2 Well of Tahe Oilfield in the Permian Igneous Rock Formation

摘要:

塔河油田SX2井3709～4025 m为二叠系火成岩地层，该地层裂缝发育，在该井段及下部井段钻井过程中多次发生漏失。通过多次桥接堵漏和水泥堵漏，效果不好，仍然存在漏失，钻穿二叠系至5340 m发生失返性漏失。利用化学固结堵漏技术对SX2井二叠系火成岩漏失层进行了封堵。化学固结堵漏浆承压能力达到17 MPa，抗温达到180 ℃，地面条件下流变性较好，便于泵送。将SX2井二叠系漏失层分成2段，利用化学固结堵漏技术分别进行封堵，堵漏施工后试压，漏失层承压能力由1.20 g/cm3提高至1.56 g/cm3，满足了后续钻井施工的要求。化学固结堵漏技术对于破碎性、裂缝性漏失层有较好的封堵效果。

关键词:钻井;堵漏;化学固结;二叠系火成岩;桥接堵漏;塔河油田

Abstract:

The 3709～4025m section of SX2 well in Tahe oilfield is in Permian igneous rock formation, where the fracture developed and several leakage happened in this 316m section and lower section during drilling process. Leakage could not be stopped by the efforts of bridging and cement plugging and the total loss occurred while drilling through the Permian at 5340m depth. The chemical consolidation plugging technology was used. The chemical consolidation slurry prepared by the chemical consolidation plugging agent has excellent properties such as high pressure bearing capacity (48h strength can reach above 17MPa), good temperature resistant (180℃) and good rheological property. This Permian leakage layer was divided into 2 sections and plugged by the chemical consolidation plugging technology, the pressure test presents that the pressure bearing capacity of the leakage layer is increased from 1.20g/cm3 to 1.56g/cm3, which meets the requirements of the subsequent drilling.

Key words:well drilling; plugging; chemical consolidation; the Permian igneous rock; bridging plugging; Tahe oilfield