Temporary Plugging Diverting Test with Fuzzy Ball Fluids in Non-Water Producing Coal Beds in Re-fracturing Well Zheng-X
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摘要:
郑庄煤层气田郑X井欲实施绒囊暂堵流体重复压裂转向，既形成新裂缝又不影响原缝生产，增加供气体积以达到满意产量。室内先用绒囊流体暂堵直径38 mm煤岩柱塞的中间人工剖缝，后用活性水测试绒囊流体暂堵剖缝承压能力达20 MPa，超过地层18 MPa的破裂压力，满足转向要求；绒囊暂堵流体伤害郑庄煤岩柱塞渗透率恢复值85%，满足原缝继续生产要求；现场利用混砂车和水罐建立循环，通过剪切漏斗配制密度为0.94～0.98 g/cm3、表观黏度为30～34 mPa·s的绒囊暂堵流体。先用活性水顶替检测原缝是否存在后，用排量为3.0～3.5 m3/h注入绒囊暂堵流体60 m3，停泵30 min油压稳定在12 MPa，表明绒囊封堵原缝成功。用活性水压裂液压裂，油管压力上升至18 MPa时出现破裂。微地震监测新缝方位为N13°W，相对于原缝N42°E转向55°。压后间抽2 h产气200 m3，是压裂前产量的2倍以上。采用微地震监测和对比压裂前后产量证明，绒囊可迫使压裂液转向压开新缝，且不伤害原裂缝，适用于煤层气老井重复压裂恢复生产。
Abstract:Re-fracturing diverting has been planned in the well Zheng-x in Zhengzhuang CBM gas field with fuzzy ball temporary plugging fluid. This job was to be done in an effort to increase the gas production by generating new fractures in the reservoir formations, without disturbing the production of the existing fractures. In laboratory studies, a fuzzy ball fluid was used to temporarily plug the artificial fractures on a 33 mm (diameter) coal plug, then an activated water was used to test the pressure bearing of the temporary plugging; it was 20 MPa, exceeding the fracturing pressure of the formation, which is 18 MPa. The percent recovery of the permeability of the coal plug previously flushed with the fuzzy ball fluid was 85%, satisfying the needs for the production of the existing fractures. In field applications, a fracturing blender truck and a water tank were used for the circulation of the fracturing fluid. A fuzzy ball fluid, with density between 0.94 g/cm3 and 0.98 g/cm3, apparent viscosity between 30 mPa·s and 34 mPa·s, was prepared through a shear funnel. After checking the existence of fractures with activated water, 60 m3 of fuzzy ball fluid was injected into the formation at 3.0-3.5 m3/h. The tubing pressure was stabilized at 12 MPa while stopping pumping for 30 min, indicating that the plugging of existing fractures with the fuzzy ball fluid was successful. The formation was then fractured with activated water when the tubing pressure was increased to 18 MPa. The azimuth of the new fractures was N13°W, as measured with microseism, meaning that 55° of diverting was realized compared with the N42°E azimuth of the existing fractures. A gas production of 200 m3 in 2 h after fracturing was achieved, doubling the gas production rate before the fracturing job. Microseism monitoring and the gas production rates before and after the fracturing job indicated that the fuzzy ball forced the fracturing fluid to divert to generate new fractures, while the production of the existing fractures was not affected. This technology is suitable for the re-fracturing of old CBM wells to generate new fractures, while the production of the existing fractures was not affected. This technology is suitable for the re-fracturing of old CBM wells.
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