Field test of single-pipe pigging in electric heating pipe in Daqing Peripheral Oilfields

For the low stripper field in severe cold areas, oil gathering with electric heating pipe is an effective measure torealize single-pipe oil gathering, simple in process and low in cost, the electric heating pipe single-pipe's pigging methodis adopted in 10 wells in a Block of Daqing peripheral oilfield. Insulated electric heating pipe together with single-pipeoil gathering and pigging process is used, single-pipe pigging tests are carried out in these pipelines to explore a new wayto optimize ground process and reduce cost for crude gathering system without electric heating at the wellhead. Throughtracking test in field on the oil gathering process of electric heating pipe combined with single-pipe pigging method, themode and process of pigging, and practicability of pigging are evaluated, which shows that although the oil gatheringprocess of electric heating pipe combined with single-pipe pigging method is feasible in Daqing Peripheral Oilfield, it isdifficult to control and manage the receiving time of the pig. Through a long-time test of electric heating with no-piggingin single-pipe, it is found out that the process of single-pipe oil gathering in electric heating pipe can be operated normallywithout pigging.