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Innovating While Drilling

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

Dual Gradient

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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Fulfilling the need for speed: Drill bit designs drilling further, faster

The third iteration of Baker Hughes’ Kymera PDC roller cone hybrid drill bit has been given a sharper and more dense cutting structure to boost ROP and durability in hard carbonates and interbedded rock.

Modern drill bits have improved exponentially over the past several years, but operators continue to raise the bar in terms of expectations for more efficiency and durability. From horizontal wells in North American shales to Middle Eastern wells with 3,000- to 6,500-ft sections and even some deepwater wells using rotary steerable systems, operators now oftentimes expect to drill entire hole sections without tripping out for a new bit. “More than 60% of the sections drilled around the world today are already done with one bit, which means that the primary way to reduce customers’ drilling costs in those sections is to significantly increase ROP,” said Allen White, Product Champion at Smith Bits, a Schlumberger company.

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New drilling float valve developed to improve operational safety

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Standard drilling float valves have allowed fluid flow to move across the sealing surface of wells, which can compromise the integrity of the sealing surface after prolonged use. To address this challenge Drilling Innovative Solutions launched the Sentinel Drilling Safety Float Valve. The new piece of drilling float equipment uses a flapper actuated ball valve technology to flow fluid through the flow tube without exposing it to the sealing surface. Watch the video with Sam Hawkins, Founder and Manager of New Products for Drilling Innovative Solutions to learn more.

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D&C Tech Digest

Halliburton’s RapidStart Initiator Sleeves were able to establish a flow path from the casing ID to formation after 10 months in a Permian Basin well.

An operator in the Permian Basin recently ran two Halliburton RapidStart Initiator sleeves, designed for selective multistage frac and plug-and-perf operations, in a cemented long-string horizontal application. The operator, working out of Midland, Texas, needed a pressure-operated toe sleeve that could run in a cemented long-string horizontal application. To ensure well integrity, they wanted to perform a casing test prior to opening the sleeve. From there, they would establish a flow path from the casing ID to the formation, allowing them to pump the first stage of the frac job, then pump down the frac plug and perforating guns for the second stage.

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Remove the barriers to automated MPD to enable automated well control

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Automated MPD can enable automated well control, making for a generally safer and more efficient drilling operation. However, barriers remain that obstruct industry’s implementation of automated MPD, including liability and traditional roles and responsibilities. Drilling contractors are typically responsible for equipment integrity on the rig, but during MPD...

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