Robert Peterson
Senior Vice President and Chief Financial Officer at Occidental Petroleum
Thank you, Vicki, and good afternoon, everyone. I want to begin today by highlighting our March credit rating upgrade and positive outlook for Moody's Investor Service. Gaining the Moody's investment grade rating is a significant milestone that acknowledges Oxy's recent financial transformation. Continued redemption of preferred equity, combined with opportunistic debt reduction tells a compelling developing story that we hope will facilitate future upgrades.
The execution of our cash flow priorities over the last several quarters enabled us to begin redeeming the preferred equity. We have redeemed or have given notice redeem approximately $647 million of preferred equity so far this year at a cost of approximately $712 million, including a 10% premium payment of close to $65 million. To date, we have eliminated approximately $52 million of annual preferred dividend, while also transfer enterprise value to our common shareholders.
During last quarter's call, we reviewed how the mandatory redemption of preferred equity is triggered when rolling 12-month common shareholder distributions reached a cumulative $4 per share. The preferred stock agreement requires at least a 30-day notice for each redemption, by the end of this week, all $647 million of preferred equity triggered for addition during the first quarter will be fully redeemed.
As of May 9, we have distributed $4.57 per share to common shareholders over the rolling 12-month period. We intend to continue repurchasing common shares in part to remain above the $4 trigger per share for as long as we are able. We recognize that staying above the $4 trigger will become more challenging in the latter half of this year due to the timing and pace of our prior share repurchase program.
Our ability to remain above the $4 trigger will be heavily influenced by commodity prices. But even if we fall below the trigger, we plan to continue repurchasing common shares so that the distribution is required to surpass the trigger in future quarters are more evenly spread throughout the year. During a period where we may be below the $4 trigger, we may also seek to retire debt opportunistically, which would achieve a similar result of transferred enterprise value to common shareholders and further enhancing our credit profile.
Turning now to our first quarter results. We posted an adjusted profit of $1.09 per diluted share and a reported profit of $1 per diluted share. The difference between our adjusted and reported profit for the quarter was primarily driven by the premium paid to redeem the preferred equity. We concluded the first quarter with nearly $1.2 billion of unrestricted cash, but had not yet made payments to preferred equity holder as of March 31 due to the 30-day redemption notice requirement. However, the first quarter call on the preferred equity is reflected in our balance sheet as an accrued liability and will be captured in future cash flow statements as payments to the preferred equity holder made.
During the first quarter, we generated approximately $1.7 billion of free cash flow before working capital, which was accomplished despite a lower commodity price environment as compared to prior quarter, lower domestic oil utilization as potential [Phonetic] WPI and lower sales and production due to the quarter-end timing of cargo listings in Algeria. We experienced a modestly negative working capital change during the period, which is typical for the first quarter, and was primarily driven by a similar annual interest payments on our debt, annual property tax payments and payments under compensation and pension plans.
These items, which are largely classified as accounts payable and accrued liabilities were partially offset by a net decrease in receivables, driven by lower commodity prices. We see the potential for working capital partly reverse in the second quarter since many of these payments are made annually in the first quarter, but accrued throughout the year.
As discussed in the last call, we expect to be a full US federal cash taxpayer in 2023, which is reflected in our financials by the reduced deferred income tax provision and our cash flow statement compared to prior quarters. We are pleased to update our full year guidance for oil and gas in OxyChem as a result of excellent first quarter performance in both businesses. Vicki reviewed many of the highlights in our oil and gas business that contributed to our production outperformance across our high-quality assets portfolio.
These factors enabled us to surpass our first quarter guidance and some are expected to continue having positive impact on production throughout the year. Specifically, the acceleration of the Al Hosn gas expansion project and new well performance in our domestic onshore businesses are expected to yield higher production than originally planned. These positive results provided us with the confidence to increase our full year production guidance midpoint to 1.195 million BOE per day.
Looking ahead, we anticipate that the second quarter production will be in the lowest of the year, primarily driven by the timing of domestic onshore activity and optimization of our maintenance schedule to reduce planned downtime in the Gulf of Mexico. As discussed on our last call, we expected that the first quarter of 2023, will have the fewest wells come online in our US onshore business all year. This proved to be the case at the Rockies and Permian unconventional businesses turned six and 53 wells to production, respectively, in the first quarter.
In the second quarter, we expect to turn significantly higher number of wells on production the benefits of which will be fully realized in the second half of the year. [Indecipherable] timing fluctuations are bringing wells online, and the resulting production impact are typically and primarily driven by the optimization of resources and pad development timing.
Internationally, we expect production compared to prior first quarter -- we expect higher production compared to the first quarter as our annual scheduled turnarounds were completed and production Al Hosn [Phonetic] is ramping up. Increased international production will be slightly offset by the just finalized Algeria production sharing contract, which decreases reported production, but is not expected to have a material impact on operating cash flow.
We anticipate that our second quarter oil mix will reduce to approximately 52% lower oil production in the Gulf of Mexico and Algeria, compounded by increased gas production at Al Hosn. While our oil mix will be lower in the second quarter, we expect that it will rebound in the second half of the year and be more in line with our full year guidance once maintenance in the Gulf of Mexico is complete. Maintenance work and the associated lower volumes in the second quarter will also contribute to a domestic price operating cost increase of $9.85 per BOE before receiving on a BOE basis in the latter half of the year.
In summary, our impressive first quarter production and activity plans for the remainder of the year provide us with the confidence to raise full year production guidance despite anticipated reduced production levels in the second quarter. OxyChem approximated guidance in the first quarter. Due to the seasonality of customers' core vinyl inventory orders, we anticipate the first half of the year reflects stronger results in the latter half of 2023. Despite macroeconomic uncertainty, margins for OxyChem's core vinyl products remain robust, and lead us to expect another year of strong results, providing us with the confidence to raise OxyChem's 2023 pre-tax income guidance midpoint to $1.5 billion.
Midstream and marketing generated pre-tax income of $35 million in the first quarter, following within our guidance range. First quarter results were primarily impacted by the timing of crude oil sales as well as favorable gas margins due to transportation capacity optimization in the marketing business. These items were partially offset by lower equity method investment from income from West.
Capital spending in the quarter approximately $1.5 billion and close to 25% of our 2023 capital plan, which remains at $5.4 billion to $6.2 billion. We expect higher capital spending in the second quarter compared to the first due to development timing in Rockies and Permian and advancement of the OxyChem better ground modernization and expansion project.
We also anticipate that capital spending in the third and fourth quarters will be below the second quarter and in line with full year guidance. Overall, the first quarter represents an excellent start to 2023. As we look ahead in the rest of the year, we are favorably positioned to execute on our cash flow priorities and advance our shareholder return framework. We aim to continue shifting our capital structure in favor of our common shareholders in the near and long-term.
I will now turn the call back over to Vicki.