Hat tip to memmel for posting this in another thread, but the juicy meat is on page 2 which he didn't quote:
Iraq oil auction dashes majors' bonanza hopes | ReutersThe failure of even Chinese oil companies -- typically the biggest payers in auctions for energy assets -- to meet Iraq's demands is not a good omen for future bid rounds, IHS Global Insight Middle East Energy analyst Samuel Ciszuk told Reuters.
Part of the reason for the chasm on value perceptions may be related to reservoir damage, Ciszuk said.
After viewing data on the fields in recent months, foreign companies may have concluded the damage, due to underinvestment in recent years, is greater even than Baghdad realizes, and so that the two sides have varying perceptions on the risks attached to meeting the production targets in the contracts.
This is of crucial importance; this ruinous policy has been going on for almost two decades now, and will severely impact URR of these fields. Recently I came across another piece saying they were still injecting resid; here is one from 2005:
Derelict Plants Are Crippling Iraq's Petroleum Industry (NYT)
If the gas is not going to be used to create petroleum products, Mr. Braudaway said, it would normally be reinjected to keep the pressure up as oil is extracted, insuring a longer life for the wells. But Iraq does not do that either. Instead, in the south, which has 80 percent of the country's oil reserves, it uses an antiquated system of water injection to keep the pressure up. (The problems are even worse in the north, where for reasons known only to themselves, Iraqi engineers pumped things like excess fuel oil, refinery residues and old crude oil into some wells, probably damaging them permanently.)
This has been going on since at least 1992:
IRAQ - The Main Fields In The North. - Free Online LibrarySince 1992, NOC has been re-injecting fuel oil into the Baba and Avanah domes. In 1990 it had a total of 269 wells, including 71 production wells.
An excellent blog:
Iraqi Reservoir Damage May Be Long-LastingBy Ruba Husari
(Published in International Oil Daily Sept. 28, 2004)
Iraq’s leading oil field, Kirkuk, may have suffered irreparable damage to its reservoir as a result of the reinjection of fuel oil, refinery residue and gas-stripped oil over the last 15 years, according to Iraqi industry sources.
The reinjected products amount to some 1.5 billion barrels, according to one estimate.
The process, which was widespread under the former regime of Saddam Hussein, is still continuing, as Iraq struggles to balance its product needs. In general, crude production since the end of last year’s war has continued in the same manner as before, with little sub-surface maintenance.
While under UN sanctions from 1990 to 2003, Iraq for years reinjected excess fuel oil into the Kirkuk field, to deal with excess products that it failed to export, legally or otherwise. Baghdad was allowed to export crude from 1996 under the UN supervised oil-for-food program, under strict supervision by UN monitors.
Petroleum engineers and analysts say the reinjection of so much fuel oil and crude could complicate the Kirkuk field’s reservoir study. “Kirkuk is already a carbonated field and reinjecting fluids that are not original fluids to the field could modify the reservoir structure,” said one engineer.
In a worst-case scenario, the use of additives could change the “wettability” of the field, creating oil-wet rocks instead of water-wet ones. That kind of damage is usually irreparable, experts say.
The injection of fuel oil has definitely increased viscosity, making crude flows harder, sources say. One remedy to this problem involves using gas lift and installing gas pumps in the subsurface facilities.
“It all depends on where in the field the injection took place, how big the area concerned is, and whether it was done at a limited number of wells and which ones,” said another petroleum engineer.