OVERVIEW
Crude oil and natural gas liquids production increased by 14% to 66,625 BOE/day during the third quarter of 2023, compared to the second quarter of 2023, primarily due to strong well performance from additional wells coming on-stream in North Dakota. Total production during the third quarter of 2023 averaged 103,192 BOE/day, an increase of 8% compared to average production of 95,572 BOE/day in the second quarter of 2023. As a result, we are increasing our average annual production guidance for 2023 to 98,000 BOE/day - 99,000 BOE/day, including 60,500 bbls/day - 61,500 bbls/day of crude oil and natural gas liquids, from 94,500 BOE/day - 98,500 BOE/day, including 58,500 bbls/day - 61,500 bbls/day of crude oil and natural gas liquids. For the fourth quarter of 2023, we expect average production of 95,000 BOE/day - 99,000 BOE/day, including 60,500 bbls/day - 64,500 bbls/day of crude oil and natural gas liquids.
During the third quarter of 2023, a total of $67.7 million was returned to shareholders through share repurchases and dividends, an increase from $66.5 million in the second quarter of 2023. As previously announced, we plan to return at least 60% of second half 2023 free cash flow1 to our shareholders, which is expected to result in over 70% of full year 2023 free cash flow returned. In conjunction with this plan, the Board of Directors approved a fourth quarter dividend of $0.06 per share to be paid in December 2023. The Company expects to continue to return significant free cash flow to shareholders in 2024 and anticipates its return of capital will equal approximately 70% of free cash flow. The Company expects to continue to prioritize share repurchases for the majority of its return of capital plan, based on current market conditions. We expect to fund the dividend and share repurchases through the free cash flow generated by the business.
Capital spending during the third quarter of 2023 was $121.4 million, compared to $180.9 million during the second quarter of 2023, with the majority of the spending focused on our U.S. crude oil properties. The decrease in capital spending was due to less completions activity during the third quarter of 2023. We are narrowing our annual capital spending guidance for 2023 to range between $520 - $540 million from $510 - $550 million.
Our realized Bakken crude oil price differential averaged $0.20/bbl above WTI during the third quarter of 2023, compared to $0.71/bbl below WTI during the second quarter of 2023. The stronger realized differential was due to higher prices for crude oil delivered to downstream markets in both Patoka and the U.S. Gulf Coast via the Dakota Access Pipeline combined with a recovery in WTI prices throughout the summer. Additionally, U.S. refinery utilizations and margins remained strong throughout the third quarter of 2023. Bakken crude oil prices have weakened in the fourth quarter of 2023 due to increased basin production and lower seasonal refinery demand resulting from planned maintenance outages. As a result, we are revising our 2023 expected annual realized Bakken crude oil price differential to $0.25/bbl below WTI, from a crude oil price differential at par to WTI, previously.
Our realized Marcellus sales price differential averaged $1.24/Mcf below NYMEX in the third quarter of 2023 compared to $0.68/Mcf below NYMEX in the second quarter of 2023. The wider differential was mainly due to increased supply in the northeast U.S. and regional storage levels tracking above historical averages. As a result of weaker expected realized differentials, we are revising our 2023 expected annual realized Marcellus natural gas differential to average $0.85/Mcf below NYMEX, from a natural gas differential of $0.75/Mcf below NYMEX, previously.
Operating expenses for the third quarter of 2023 increased to $96.6 million, or $10.17/BOE, compared to $89.1 million, or $10.25/BOE during the second quarter of 2023. The increase in total spend was due to higher production as a result of new wells brought on stream during the second and third quarters of 2023. We continue to expect operating expenses in the fourth quarter of 2023 to increase compared to the third quarter of 2023, due to planned workover activity. As a result, we are revising our operating expenses guidance for 2023 to range between $10.75/BOE - $11.00/BOE from $10.75/BOE - $11.50/BOE.
We reported net income of $127.7 million in the third quarter of 2023, compared to net income of $74.2 million in the second quarter of 2023. Net income increased primarily due to higher commodity prices and crude oil and natural gas liquids production in the third quarter of 2023.
In the third quarter of 2023, cash flow from operating activities and adjusted funds flow increased to $212.2 million and $263.7 million, respectively, compared to $186.6 million and $196.6 million in the second quarter of 2023. The increase was primarily due to higher commodity prices and crude oil and natural gas liquids production in the third quarter of 2023.
At September 30, 2023, net debt increased to $212.1 million, compared to $199.6 million at June 30, 2023. Net debt is calculated as total debt, which was comprised of our senior notes and borrowing on our $900 million sustainability linked lending (“SLL”) bank credit facility and our $365 million SLL bank credit facility (together referred to as the “Bank Credit Facilities”), less cash on hand of $46.2 million. Net debt increased primarily due to working capital changes, as our non-cash operating and investing working capital deficit changed by approximately $85.0 million in the third quarter of 2023. At September 30, 2023, a total of $135.7 million was drawn on our Bank Credit Facilities. Our net debt to adjusted funds flow ratio was 0.2x, which remains consistent with the second quarter of 2023.
1 This financial measure is a non-GAAP financial measure. See “Non-GAAP Measures” section in this MD&A.