ABSTRACT

Production of oil and gas from shale wells formations located in the Permian Basin, West Texas, has increased due to high demand. It is estimated that approximately 30 billion barrels of oil and 75 trillion cubic feet of natural gas of been produced from Permian wells since the 1920s. Due to global demand for oil and gas, Permian production is once again growing and is estimated to continue to break production records by 2027.

During oil and gas production, API 5CT L80 production tubing is commonly used. Due to the exposure to the production of oil, gas and produced water, and other chemicals the internal surface of the tubing experiences wear and corrosion.

Lately, L80 tubing failures due to various corrosion mechanisms were observed. This paper presents two case studies of L80 corrosion failures and associated corrosion mechanism(s) via lab failure analysis.

INTRODUCTION

The Permian Basin is an oil-and-gas-producing area located in West Texas and the adjoining area of southeastern New Mexico. The Permian Basin covers an area approximately 250 miles wide and 300 miles long and is composed of more than 7,000 fields (best represented in Railroad Commission of Texas production figures as districts 7C, 08, and 8A) in West Texas.1 The greater Permian Basin accounts for nearly 40 percent of all oil production in the United States and nearly 15 percent of its natural gas production. Figure 1 shows the location of the Permian Basin on US map and the basin map.

Similar to the other shale plays, oil and gas production conditions in Permian wells consists of acid gases (CO2 and H2S) and high chloride content. Range of acid gases and chloride content encounter in Permian basin oil and gas production wells compared to other locations is provided in Table 1.

Recently production of oil and gas from shale wells formations located in the Permian Basin, West Texas, has increased due to high demand. However, due to high chloride content and presence of acid gases, CO2 and H2S, the downhole tubing equipment may experience internal corrosion.

This content is only available via PDF.
You can access this article if you purchase or spend a download.