Study progress of injection/pressure drop test well for coalbed methane well

In order to well guide the design, construction and explanation of the injection and pressure drop test well in the coalbed methane, the paper introduced the study status and development of the equipment technology and the test well explanation for the injection and pressure drop test well in the coalbed methane wells at home and abroad. The paper focused on the analysis on the main problems existed in the four aspects of the test equipment and tools, the test technology, the test well explanation theory and method and the test well explanation parameter selection and the results. The paper pointed out that the key development orientation of the future coalbed methane injection and pressure drop test well would be the injection and pressure drop test well applied to the casing perforation well, the optimized technology of the equipment technology, the indoor test simulation study and the numerical test well technology aspects. At present, from the test well design, information selection, model selection, mathematical algorithm and other aspects, the reduction of the multiplicity would be the problem to be solved immediately.