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Innovating While Drilling

NOV develops 140-ksi, sour gas-resistant coiled tubing

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National Oilwell Varco (NOV) recently developed 140-ksi specified minimum yield strength (SMYS) coiled tubing, or CT140. Because the target market for high-strength tubing is high-pressure well intervention and completions, sour gas compatibility testing was performed. The testing program verified that while using chemical inhibitors, the tubing/inhibitor system was not susceptible to sulfide stress cracking. In this video from the 2017 SPE/ICoTA Coiled Tubing and Well Intervention Conference in Houston on 21 March, Kevin Elliot, NOV Product Engineering Manager, discusses the development process that was undertaken, as well as the resulting mechanical properties and fatigue life of CT140. For more information about this project, please see SPE 184806, “Development and Compatibility Testing of Coiled Tubing With 140-ksi Specified Minimum Yield Strength.”

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New control software aims to optimize water treatment processes

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Water Planet has deployed its new IntelliFlux control software at California’s first merchant facility designed to treat oil and gas produced water for beneficial reuse. Operated by Sweetwater Tech Resources (STR), this regional water treatment facility gives local oil and gas producers a reliable, economic and sustainable option for converting billions of gallons of produced water annually into clean water streams available for beneficial reuse. It is located in Wasco, a town centrally located around multiple active oil fields surrounding Bakersfield. Because the wastewater can be treated for reuse, oil producers have a cost-competitive option to trucking it to third-party disposal wells. The project is expected to yield significant environmental benefits by reducing the amount of water disposed, as well ...

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New drill bit adjusts to downhole conditions for smoother, faster drilling

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Baker Hughes’ newly released TerrAdapt adaptive drill bit is expected to deliver dramatic improvements in drilling economics by using automation to mitigate downhole dysfunctions that cause inefficient drilling and costly tool failures. With the industry’s first self-adjusting depth-of-cut (DOC) control elements, the TerrAdapt bit automatically changes its aggressiveness based on the formation through which it is drilling to mitigate vibrations, stick-slip and impact loading...

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Influx management envelope deployed during planning phase for 3 sections of deepwater MPD well

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The MPD Operations Matrix was introduced in 2007 to serve as an operational guide for drilling MPD sections. The intent of the matrix is to balance operational, well and equipment limitations with “acceptable” influx volumes. The operations matrix has become the cornerstone of MPD projects worldwide and is a mandatory component of planned MPD wells in the US Gulf of Mexico...

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New drill stem rotary shoulder connection incorporates innovative single start shark thread shape

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For the past century, the oil and gas industry has been pushing the limits of the existing drilling envelope to reach deeper, more remote hydrocarbon reservoirs. The evolution of drilling programs has driven drill string manufacturers to engineer new drill pipe solutions to safely develop the most challenging horizontal and extended-reach drilling (ERD) well profiles.

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Experimental setup at Texas A&M Dual Gradient Drilling Lab aims to study riser gas migration in controlled mud level drilling system

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Growing demand for energy is pushing operators to drill in ever-increasing ocean depths. Deepwater offshore reservoirs often exist where the required pressure from the drilling mud for well control is very near the pressure at which overlying layers can break down, resulting in loss of circulation of drilling mud to thief zones, inviting dangerous kicks of high-pressure gas and oil. Such narrow drilling pressure windows leave razor-thin margins for error...

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Coiled-tubing cementing operation on HPHT well uses MPD technique to lower costs, ensure integrity

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The number of exploration wells drilled in high-pressure, high-temperature (HPHT) environments keeps growing, spurred by the ongoing search for new oil and gas reserves. Per the Norwegian Standards Organization (NORSOK), an HPHT well has a wellhead shut-in pressure exceeding 69 MPa (10,000 psi) and an ambient temperature greater than 150°C (302°F)...

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Light annular mud cap drilling, downhole isolation valve help to drill fractured gas reservoir in Indonesia

The lower completion consists of a float shoe with a flat-bladed nose, alternating joints of pre-perforated, frangible disk plug, and a 7-in. x 9 5/8-in. liner top packer.

An operator in Indonesia sought to drill on a gas field that lies on the western flank of the Central Palembang Sub-basin, in the South Sumatra Basin. South Sumatra is a Tertiary back-arc basin, approximately 500 km by 300 km. The pre-Tertiary rocks provide the lower reservoir portion of the gas field, while the upper portion of the reservoir is within porous Tertiary sediments of the Lower Talang Akar and Batu Raja formations. The Tertiary and pre-Tertiary reservoir rocks are enhanced by natural fractures...

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