The Study On The Sand-pack Fracture Flow Conductivity Of Coal Petrography

Nowadays, all over the world demand for energy is increasing and conventionaloil and gas resources are consuming, which leading to an energy crisis to someextent.As a result, countries have paid more attention to the R&D for new energy andthe exploration of unconventional oil and gas resources.And, of unconventional oiland gas resources, CBM(coal-bed methane) is characterized by high-efficiency andenvironment-protecting, at the same time the exploration and development of CBMcan contribute to the safe production of coal mine. In our country CBM is listed in thenational5-year project,however coalbed reservoir has different characteristics indifferent countries and areas.Hence,the exploitation strategy is developed by theirown features. The coalbed reservoir in our country has the characteristics of lowporosity, low permeability and low saturation. So stimulation measures have beentaken in order to exploit economically, of which hydraulic fracturing is greatlyeffective.The main content of the paper is the law on the sand-pack fracture flowconductivity of coal petrography after stimulation.Research in the paper is theexperiment of proppant embedment, the affecting experiment opposing the sand-packfracture flow conductivity of coal petrography of the sanding concentration and theaffecting experiment opposing the sand-pack fracture flow conductivity of coalpetrography of the coal fine movement.In the end,the suggestion can be offered in theconstruction site.Based on the research and paper writing, the main conclusions are as follows:1) On the basis of a large number of documents, I have a better understanding ofwhat I study, describe the petrographic characteristics of coal and compare the testingmethod of the fracture conductivity. 2) The proppant embedment degree increases with closure pressureincrease,while the fracture conductivity decreases with closure pressure increase.3) The fracture conductivity decreases with closure pressure increase at the samesanding concentration.And The fracture conductivity increases with the sandingconcentration increase, which three layers of proppant is reasonable in the stimulationmessure.4)Coal fines have a loss of the sand-pack fracture flow conductivity of coalpetrography sharply,and the loss of the sand-pack fracture flow conductivity of coalpetrography varies from the different coal fines. The smaller the particle size,thesammller fracture conductivity.