Periodical information collection from unreachable remote terrain and then transmit information to a remote base station is one of the targeted applications of sensor networks. But the energy restriction of battery operated sensor nodes certainly makes this task difficult and complicated because once deployed in the target field, it is not feasible to change the battery periodically. Therefore, in order to keep the networks operating for long time, efficient utilization of energy is considered with highest priority. In this paper we propose COSEN - a chain oriented sensor network for collecting information efficiently. COSEN is efficient in the ways that it ensures maximal utilization of network energy, it makes the lifetime of the network longer, as well as it takes much lower time to complete a round. Simulation results show that COSEN demonstrates around 20% better performance than that of PEGASIS in respect of number of rounds before the first sensor dies. It also saves about 260% time on average in comparison to PEGASIS. Comparative analysis and simulation show that COSEN noticeably gives a good compromise between energy efficiency and latency.