Robert Peterson
Senior Vice President & Chief Financial Officer at Occidental Petroleum
Thank you, Vicki, and good afternoon, everyone.
During the second quarter, we posted an adjusted profit of $0.68 per diluted share and a reported profit of $0.63 per diluted share. Difference between our adjusted and reported profit was primarily driven by impairments for undeveloped non-core acreage and deferred tax impacts from the Algeria production sharing contract or PSC renewal, partially offset for an environmental remediation settlement.
In the second quarter, strong operational execution enabled us to generate over $1 billion of free cash flow for working capital, despite planned maintenance activities across several of our oil and gas businesses. Following nearly $1 billion of preferred equity redemptions and premiums, $445 million of common share repurchases and approximately $350 million are LCVs investment in NET Power, we conclude the second quarter with approximately $500 million unrestricted cash.
We experienced a positive working capital change during the second quarter, primarily driven by reductions in commodity prices and fewer barrel shipment over quarter end. Interest payments on debt are generally paid semiannually in the first and third quarters which also contributed to a positive second quarter working capital change. During the second quarter, we made our first U.S. federal cash tax payments this year, up $210 million and state taxes of $64 million, which were netted out our working capital. We anticipate a similar federal cash taxes we made in subsequent quarters this year, though state taxes are paid annually.
Our second quarter effective tax rate increased from the prior quarter due to a modest change in our income's jurisdictional mix. The proportion of international income, which is subject to a higher statutory tax rate grew during the second quarter. We are therefore guiding to a minimum adjusted effective tax rate of 31% for the third quarter as we expect our effective tax rate going forward will be more closely aligned with the second quarter rate.
I will now turn out to our third quarter and full year guidance. As Vicki just discussed, our technical and operational excellence continues to drive our performance across our oil and gas businesses. This has enabled us to raise our full year production guidance midpoint just over 1.2 million BOE per day, anticipation of a strong exit for the year. Rockies outperformance serves as the largest catalyst for our full year production guidance raise and is also a primary driver of the slight change to our full year oil mix guidance.
Reported production in Rockies is expect to reduce to its lowest point this year in the third quarter, before beginning to grow in the fourth quarter. In the Gulf of Mexico, we are guidance slightly lower production in the third quarter compared to the second quarter due to contingency for seasonal weather. The third quarter weather contingency as well as planned maintenance opportunities brought forward to reduce our downtime are expect to result in our highest domestic operating costs on a BOE basis this year when normalizing to less than $9.50 per BOE in the fourth quarter.
Internationally, we expect higher production compared to the first half of 2023, due to planned turnaround and expansion project timing Al Hosn as well as impacts from various international production sharing contracts. As we have previously mentioned, the increased international production will be slightly offset by the new Algeria PSC, which decreased reported production, but the reduction in imported barrels is not expected to have a material impact on operating cash flow.
Overall, the first half of 2023 was characterized by strong production in Gulf of Mexico, Permian and Rockies, with latter two businesses also benefiting from non-recurring production events. We have better anticipated wells and time-to-market momentum year-to-date, which we expect benefiting from in the second half of the year.
The third quarter will be the only quarter in the year where we -- production average is below 1.2 million BOE per day. Reduced production is mainly driven by the previously mentioned weather contingency implies to the Gulf of Mexico. The decrease in third quarter production will likely result in total company production is lower in the second half of the year when compared to the first. However, the change in expected production does not represent a shift in our volume trajectory. We anticipate fourth quarter production will be similar to the first two quarters of 2023, and we expect to enter 2024 with a strong production cadence. Furthermore, our full year guidance implies our fourth quarter of approximately 53%, largely due to improved GOM production assets at third weather contingency.
Shifting now to OxyChem. As anticipated in our original guidance, we continued to see weakening in the PVC and caustic soda pricing during the second quarter. However, our full year guidance remains unchanged at a pre-tax income midpoint of $1.5 billion, which will represent our third highest pre-tax income ever and another strong year for OxyChem.
We also expect our chemicals business to return to more normalized seasonality compared to recent years, meaning that the fourth quarter will represent the lowest earnings for the year. As we have mentioned on previous calls, the fourth quarter is typically not a reliable roll forward for the year ahead through the inherent seasonality of the business.
We revised our full year guidance for midstream and marketing due to expected market changes over the second half of this year. The margins generated by shipping crude from Midland to the U.S. Gulf Coast are expected to compress further following the annual FERC tariff revision, which has increased our pipe cost approximately $2.55 a barrel. Over the same period, the prices to market long-haul capacity is expected to decrease. Additionally, we anticipate fewer gas marketing opportunities as spreads across multiple basins have continued to narrow, following opportunities generated in the first quarter. Also, pricing for sulfur produced in Al Hosn is expected to soften in the second half of the year.
Capital spending during the quarter was approximately $1.6 billion. We expect capital to slight -- decrease slightly in the third quarter with a more pronounced reduction in the fourth quarter. The expected decrease was primarily driven by reduced working interest and gross activity in the Permian, which is in line with our original business plan. We anticipate receiving $350 million during the fourth quarter associated with the second quarter environmental remediation settlement. While this settlement will drive our reported overhead down, our full year guidance to overhead expense on an adjusted basis remains unchanged.
Turning now to shareholder returns. As Vicki mentioned, we further advanced our shareholder return framework during the second quarter through the repurchase of $425 million of common shares, which enabled additional preferred equity redemptions. After a strong start in the first quarter, we triggered the redemption of over $520 million of preferred equity in the second quarter. Year-to-date, we've redeemed approximately $1.2 billion or 12% of preferred equity that was outstanding at the beginning of the year with 10% premium payments to the preferred equity holder of approximately $117 million. Preferred equity redemptions to date have resulted in elimination of over $93 million of annual preferred dividends.
As of August 2nd, rolling 12-month common shareholder distributions totaled $4.08 per share. Due primarily to the concentration of share repurchase in the third quarter of 2022, coupled with the current commodity price curve, it is likely that the cumulative distributions will fall below the $4 per common share during the third quarter. If we drop below the $4 redemption trigger, our ability to begin redeeming the preferred equity, again, will heavily be influenced by commodity prices. WPI prices would likely need to be higher than what the forward curve presently indicates for us to remain above the trigger for the remainder of 2023.
Even if we aren't able to continue redeeming the preferred equity for a period of time, we remain committed to our shareholder return program, including our $3 billion share repurchase program. Our basic common share count is at the lowest since the third quarter of 2019, resulting in per share earnings and cash flow accretion to our common shareholders.
Sustained efforts to significantly deleverage over the past several years have improved our credit profile, culminating a return to investment-grade status when the Fitch ratings upgraded Oxy in May. We believe that our investment-grade credit ratings reflect our exceptional operations, diversify the high-quality asset portfolio and our commitment to pay down debt as it matures. Our second quarter results and our full year guidance demonstrates solid progression towards another strong year for Oxy. We look forward to reporting on additional progress as the year advances.
I will now turn the call back over to Vicki.