Research And Application Of Modification Completion Fluid For Testing Gas In Yuanba Area

Yuanba gas field high temperature and high pressure, high sulfur and other special complex geological conditions, leading to field test has been the existence of gas testing work with many technical problems. Especially in the gas test in the testing process, the drilling fluid is used directly as completion fluid, in the long-term high temperature static, generally showed no anti temperature, barite sinking, lead pipe plugging test tools, test failure, perforating gun card embedded safety accidents. Based on this kind of completion fluid extensive experimental analysis found that the reason of temperature resistance, the sedimentation stability of variation is the completion fluid in long-term high temperature static prone to degradation, colloid structure was severely damaged. Because Yuanba did not mature gas test test completion fluid system, under the premise of reducing the cost of drilling fluid was modified, the formation of a suitable gas test test of Yuanba area modification and completion fluid system. Based on the drilling fluid was modified and optimized, it was found that the modified completion fluid has good resistance to high temperature stability, sedimentation stability and reservoir protection, and has low cost. At the same time, the reservoir cracks and holes in the completion of gas test development, test process easily cause well leakage, resulting in gas test test failed. To tie in with the completion of gas testing testing, with existing plugging material as the foundation, through the formulation optimization, has formed a set of suitable for gas test test of Yuanba area high acid soluble plugging formula and matching technology. And find out a set of modified completion fluid evaluation method and index. Through the Yuanba area live4Export ultra deep horizontal well test, the site of modification and completion fluid has excellent performance of high temperature resistance, stability of sedimentation and reservoir protection, disposable plugging success rate reached100%, achieved the purpose of modification and completion fluid,ensure the completion of gas testing testing construction work carried out smoothly.