红河油田直通型裂缝高强度封堵剂调剖技术

为了解决天然裂缝发育类油藏注水开发过程中水线推进速度快、易出现水窜、水驱效果差等问题,红河油田先后开展了冻胶封堵、"冻胶+颗粒"封堵调剖技术研究及现场试验,但由于冻胶体系自身材料力学性能的影响,整体效果不理想.优选了一套单体聚合类高强度封堵剂体系,该体系具有黏度大、成胶时间短、强度高、触变性能好的特点,65?℃条件下成...

Profile control technology with high-strength plugging agent for straightly-connected fractures in Honghe Oilfield

The oil reservoirs with developed natural fractures are faced with fast waterline advancing, easy water channeling and poor water flooding effect in the process of water flooding development. In order to solve these problems, Honghe Oilfield carried out researches and field tests on profile control technologies with gel plugging and gel plugging+particle/bentonite plugging. Due to the material mechanical performance of the gel system, however, the overall effect is not satisfactory. A series of investigation and analysis were carried out to select a set of high-strength plugging agent system of monomer polymerization. This system has the advantages of high viscosity, short gelation time, high strength and good thixotropy. Under the condition of 65 ℃, its gelation time is adjustable between 15 h, and the breakthrough pressure in the pipeline with length of 0.5 m and diameter of 3 mm is 7.0 MPa/m. In Honghe Oilfield, pilot tests are performed in four wells by five times and the effective rate is 100%. It can form high-strength plugging in fractures and effectively increases the plugging strength of the plugging agent in straightly-connected fractures. After profile control is implemented, average pressure is increased by 6.7 MPa, cumulative water injection is 5 643 m3 and cumulative oil increase is 2 723.1 t. In conclusion, this system can effectively solve the problem of fast water channeling in the oil reservoirs with developed natural fractures in the process of water flooding development in Honghe Oilfield.