Conductivity Evaluation of Horizontal Wells in Coalbed Methane Reservoirs: Applicability of Micromaterial Tracer Testing Technology

Abstract

Horizontal well-staged fracturing technology is widely used in the exploitation of coalbed methane reservoirs. Most coalbed methane wells have little or no flowback fluid after fracturing due to strong adsorption in the reservoir. The fracture conductivity of each fracturing interval can only be evaluated in the water drainage and gas production stage. Traditional chemical tracer monitoring technologies are risky to operate and do not provide accurate qualitative measurements. The potential applicability of trace material tracer testing technology in coalbed methane reservoirs has theoretical and practical significance, as does establishing a set of fracturing tracer technologies (e.g., reagent systems, construction schemes, detection interpretation) suitable for coalbed methane horizontal wells. Geological, laboratory, and field test data are used in this study to preliminarily resolve the trace material tracer adsorption problem in the coalbed by improving the chemical agent formula. The proposed method is applied to determine the conductivity of a fractured section in a coalbed methane well.

Study on an Anti-adsorption Micromaterial Tracer System and Its Application in Fracturing Horizontal Wells of Coal Reservoirs

“…With the widespread application of horizontal well fracturing technology, it has become imperative to evaluate the effectiveness of staged fracturing in horizontal wells and determine the productivity of each individual segment . Since the fracturing scale and construction parameters are essentially identical for each segment during fracturing, theoretically, production should be consistent across all segments and contribute equally to the overall well productivity . So, it is necessary to conduct actual production tests on each segment of the horizontal well. , Unlike vertical wells, the horizontal wells are long and have a certain inclination.…”

“… 11 Since the fracturing scale and construction parameters are essentially identical for each segment during fracturing, theoretically, production should be consistent across all segments and contribute equally to the overall well productivity. 12 So, it is necessary to conduct actual production tests on each segment of the horizontal well. 13 , 14 Unlike vertical wells, the horizontal wells are long and have a certain inclination.…”