China's largest ultra-heavy oil field has produced more than 20 million tons of crude oil

On January 22, the reporter learned from the Xinjiang Oilfield Company that as of January 20, the Fengcheng Oilfield of Xinjiang Oilfield Company, the largest ultra-heavy oilfield in China, had produced more than 20 million tons
of crude oil.

Located in the Junggar Basin, the Windy City Oilfield is also known as the "Oilfield That Flows Still" because of its crude oil viscosity of up to one million
centipoises.
Windy City Ultra Heavy Oil is a high-quality naphthenic crude oil that can produce more than 70 kinds of high-end chemical products based on naphthenic crude oil as raw material
.

In order to make the "unmoving oil field" flow, in 2008, the Windy City Oilfield introduced the SAGD development technology, that is, the use of steam to assist the gravity drainage, which is a development technology similar to the "barbecue" type, through the steam below "hot baking", so that the heavy oil above gradually "softened" flow
.

In 2012, the technology was applied to the large-scale industrialization; In 2017, it achieved a "double hundred" breakthrough
of SAGD single well group with a daily output level of 100 tons and a cumulative annual oil production of one million tons.

At the same time, in view of the outstanding development contradictions at the end of the ultra-heavy oil throughput and the decline in the efficiency of a single well, the Windy City Oilfield also uses steam to form a steam cavity in the upper part of the oil layer to heat crude oil, and develops
crude oil under the dual action of driving force and gravity.

At present, the Fengcheng Oilfield has formed a displacement composite 136 well group, the oil production level in the test area has risen from 89 tons to 118 tons, and the oil-to-vapor ratio has increased from 0.
13 to 0.
20
.
It is worth mentioning that since 2020, the VHSD (Straight Well - Horizontal Well Steam-Assisted Gravity Drain) test area has been
operating at the level of 100 tons per day of crude oil.

In order to ensure that the oilfield is injected with enough steam and injected with good vapor, the Fengcheng oilfield implements "classification and sub-injection" according to the characteristics of regional production; Strengthen combined steam injection, and implement combined steam injection of physical properties and steam channeling; According to the production rhythm, optimize and adjust the balance of supply and demand of summer and autumn steam; Sort out the contradictions of regional injection repair, focus on highlighting regional potential, and innovatively implement the summer steam injection strategy
of "regional rotation injection and centralized workover".
In 2021, the oil-to-vapor ratio of heavy oil reservoirs will increase by 0.
004, and the decline rate will be controlled within 3%, the best level
in history.