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CARACAS - A US blockade of Venezuelan oil shipments could slash production and halve exports of the country's most valuable commodity, tipping its economy even deeper into crisis, experts say.
US President Donald Trump on Tuesday ordered a "total and complete blockade" of sanctioned oil tankers Venezuela has been using to bypass a six-year-old US oil embargo.
The announcement marked an escalation of Trump's offensive against Venezuelan leader Nicolas Maduro, whose last two re-elections have been widely slammed by the international community as fraudulent.

Venezuela, now led by President Nicolas Maduro, has been sidestepping a US oil export embargo for years. (AFP/Venezuelan Presidency)
Venezuela has been sidestepping a US oil export embargo for years, selling crude at a heavily discounted price mainly to China -- income Trump claims is used to finance "drug terrorism, human trafficking, murder and kidnapping."
The country is estimated to have oil reserves of some 303 billion barrels, according to the Organization of the Petroleum Exporting Countries (OPEC) -- more than any other nation.
But years of mismanagement and corruption slashed production from a peak of more than three million barrels per day (bpd) in the early 2000s to a historic low of 350,000 bpd by 2020.
Washington vowed to keep the cargo.
There are about 600 oil tankers under US sanctions globally, of which 23 are listed under programs targeting Venezuela, according to an AFP analysis of data from the US Office of Foreign Assets Control and the International Maritime Organization.
Of these, six were sanctioned just last week.
What about the future?
Caracas will likely now be under pressure to reduce its black market prices even further, even as global crude prices surged early Wednesday on the back of the US blockade.
"Discounts on the price per barrel are expected to accelerate and will likely deter many tankers from going to Venezuela," said Monaldi, predicting "a dramatic decline."
Monaldi predicts exports may drop by as much as half, "depending on how often sanctioned tankers...are seized."
After The Skipper was taken by US forces, the PDVSA was unable to load any new tankers for six days, a parliamentary source told AFP on condition of anonymity.
"That's going to create a serious problem because it (the PDVSA) has at most 15 days of storage capacity."
Monaldi said storing oil is expensive and "the most likely outcome is that they'll shut down production, which could fall by roughly 400,000 barrels per day."
What about the clients?
Trump's order has not yet affected shipments to the United States by Chevron, which operates in Venezuela under a special license.
Chevron accounts for about 10 percent of Venezuelan production, but it is no longer allowed to transfer money to the government and therefore pays taxes and other dues in crude -- further starving Caracas of much-needed dollars.
"The license granted to Chevron in July allows it to take 50 percent of what is produced by the joint ventures it operates with PDVSA," Oswaldo Felizzola, a Venezuelan energy researcher with the IESA business school, told AFP.
The Capital Economics forecasting firm noted Wednesday that lower oil shipments "would cut off a key lifeline for Venezuela's economy" in the near future.
Economist Asdrubal Oliveros told Venezuelan radio a drop in exports to Asia could cost Venezuela billions of dollars in annual revenues.
China, which receives 80 percent of Venezuelan crude exports, would be impacted most.