Changqing Oilfield Associated Gas Recycling Technology Research

The Erdos Basin region is China’s important oil and gas producing area, of which onlythe proven crude oil reserves of the Mesozoic group reaches3070million tons. Reservoirs inthis area generally belong to low permeability reservoirs. The reservoir pressure is greater thanthe original oil saturation pressure and the original dissolved hydrocarbon ratio is20~120m3/t. Production of oil/gas is60~100m3/t. If oil and gas production only is calculated as60m3/t, the associated gas is yearly14.4x108m3. The utilization of the associated gas of theChangqing oilfield is limited to the light hydrocarbon recovery unit, not for its researchnowadays. However, the oil associated gas, the same with the oil or gas, is a rare nature left tous and non-renewable resources. If all are released or burnt into the atmosphere, it not onlycauses the waste of precious resources, but seriously pollutes the environment. So thecomprehensive utilization of associated gas resources is urgent needed.This article sums up the Changqing oilfield associated gas oil and gas properties and thedevelopment characteristics at present, which is based on the associated gas field testing,associated gas components, reserves, distribution laws and its analysis and research of thecomprehensive utilization. Taking the Xifeng oilfield as an example, on the basis of theproducing gas-oil ratio changing rule, it studies the associated gas production forecastingmethod and makes programs. In combination of the theoretical analysis and experimentalresearch, this article presents two gas technology, the Skid-mounted light hydrocarbonsrecovery and electricity generation by gas, and has made the preliminary analysis to its benefit,believing that there is a higher economic benefit and promotion value.