The Feasibility of Increasing the Recovery Factor from the Nagylengyel Deposit in Hungary by Tertiary Oil Recovery using Ammonia Injection

Bán, Andreas; Balint, Valer; Nagy, Stanisław; Pach, F.

doi:10.1007/978-94-009-6649-9_24

Cited by 1 publication

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“…Water-based drilling fluid system was invented nearly 100 years ago [1][2][3]. In the 1930s, many patented silicate drilling fluids appeared in the US, which were proved effective in preventing borehole instability [4][5][6][7]. In the early 1960s, US engineers started to replace caustic soda with silicate as an additive to adjust the pH of drilling fluid, with the aim to stabilize shale and thus the borehole [8][9][10][11][12][13].…”

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confidence: 99%

Drilling Fluid Formula and Performance for Slow Angle Wireline Core Drilling

Peng¹,

Jiang²

2020

IJHT

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This paper aims to develop suitable formulas of the drilling fluid for slow angle wireline core drilling. Firstly, the materials and properties of drilling fluid were analyzed in details. Then, three kinds of drilling fluids were prepared, namely, those with low-solid phase mud, those with no-solid phase mud, and those with weighted mud. After that, a total of forty drilling tests were carried out using each type of drilling fluids. The average coring rate was as high as 87%. Based on the test results, the drilling fluid formulas for slow angle wireline core drilling were optimized as follows: original mud + 4.5% cellulose + 5% potassium humate + 4.5% high-efficiency water loss reducer + 6% multi-effect plant gum SD-2 + 5% type 06 lubricant + water for relatively complete strata; original mud + 0.75% cellulose + 2% potassium humate + 2% multi-effect plant gum SD-2 + 5% type 06 lubricant + water for broken and collapse-prone strata; original mud + 0.75% cellulose + 5% potassium humate + 2% multi-effect plant gum SD-2 + 5% type 06 lubricant + 10% barite + water for high-pressure strata. The research results provide a good reference for drilling fluid preparation in slow angle wireline core drilling.

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