Research and application of condensate reservoir stimulation technology of coal measure hydrocarbon source rock

To deal with the small stress difference between the reservoir and adjacent coal seams of the condensate gas reservoir in H depression of the coal source reservoir, the technology of carrying multi-stage proppant segment by linear gel is studies to control fracture height, instead of the conventional method of sinking agent. To deal with the high clay content of the formation, which may cause damage to itself, low concentration carboxymethyl hydroxypropyl guar fracturing fluid was selected, and for the prepad slug, 5%~10% diesel was mixed to lower circulation loss by emulsifying. By changing the treatment process and fracturing liquid, the stimulation treatment obtained good results. Three zones fracturing pilot test was done on H10 well successfully. The maximum proppant volume was 35 m3 for single layer, with three proppant segment plugs. And the maximum proppant concentration is 570 kg/m3(sand liquid ratio is 35%). While the average proppant concentration is 478 kg/m3 (sand liquid ratio is 27.5% ). The zones have no production before stimulation, but 48% of the fracturing fluid has been flowed back after fracturing, and the total gas production is 4×104 m3 and condensate oil production is 0.4 t/d. The well temperature test and simulation analysis show that the issues of fracture height, filtration loss and multiple fractures have all been controlled effectively. The successful implementation of the pilot test provides a reference for similar reservoir stimulation.