The influence of TiO2 and SiO2 nanoparticles on filtration properties of drilling muds

Scientific paper - Original scientific paper

• Title (croatian): Utjecaj dodavanja nanočestica TiO2 i SiO2 na filtracijska svojstva isplaka na bazi vode
• Author: Petar Mijić https://orcid.org/0000-0003-3690-5787
• Author: Nediljka Gaurina-Međimurec
• Author: Borivoje Pašić
• Author: Igor Medved
• Author's institution: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Petroleum and Gas Engineering and energy)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering

Abstract (english)

During the drilling of a well, differential pressure causes filtration of the mud liquid phase into the surrounding rocks. To reduce the filtrate invasion in the rock, it is necessary to maintain the density of the mud. Also, Wellbore Strengthening Materials (WSM) can be preventively added to the mud to increase the fracture initiation pressure of the drilled formation. The solid particles from the mud create a mud cake on the wellbore wall, which, for conventional drilling, implies the use of bentonite and barite whose particle dimensions range from 0.1 to 100 μm. While drilling shales, rocks which contain pores that have an average pore size of 10 to 30 nm, it is not possible to create a high-quality mud cake, so water passes into the shale and creates wellbore instability problems. To stabilize the shale, the petroleum industry uses oil-based muds, but due to their environmental impact, it is not always possible to implement them. Nanoparticles, because of their small dimensions, can enter into the nanopores and fill this space and strengthen the rock, resulting in decreased filtration. In this paper, a review of previous laboratory research of adding nanoparticles on filtration is shown. Also, the impact of adding nanoparticles on API and HTHP filtration is examined by adding TiO2 and SiO2 nanoparticles in concentrations of 0.5 wt% and 1 wt% to the five water-based muds. The best result was obtained with TiO2 nanoparticles at a concentration of 0.5 wt%.

Abstract (croatian)

Tijekom izrade kanala bušotine zbog razlike između tlaka u kanalu bušotine i slojnoga tlaka dolazi do filtracije tekuće faze iz isplake u stijene pribušotinske zone. K ako bi se smanjila količina filtrata koja prodire u stijene pribušotinske zone, potrebno je održavati određenu gustoću isplake koja neće uzrokovati tlak u bušotini veći od tlaka loma formacije. Uz to, u isplaku se preventivno dodaju materijali za očvršćavanje stijenki kanala bušotine. Čvrste čestice iz isplake, ponajprije bentonita i barita, čija se veličina čestica kreće od 0,1 do 100 μm, odlažu se na stijenkama kanala bušotine te stvaraju isplačni oblog. Tijekom izrade kanala bušotine u šejlovima koji imaju pore prosječnoga promjera od 10 do 30 nm klasični materijali ne mogu stvoriti visokokvalitetan isplačni oblog, pa tekuća faza iz isplake prodire u šejl i stvara probleme vezane uz stabilnost kanala bušotine. Zbog toga se naftna industrija okrenula primjeni isplake na bazi nafte, ali pogotovo u zadnje vrijeme zbog njezina nepovoljnog utjecaja na okoliš traže se nova rješenja koja će omogućiti primjenu isplaka na bazi vode. Stoga se u posljednje vrijeme sve više provode laboratorijska ispitivanja uporabe nanočestica koje zbog svojih malih dimenzija mogu ući u nanopore, ispuniti taj prostor i ojačati stijenke kanala bušotine, što u konačnici rezultira smanjenom filtracijom. U ovome radu prikazan je pregled prethodnih laboratorijskih istraživanja utjecaja nanočestica na filtraciju. Osim toga, ispitan je utjecaj dodavanja nanočestica TiO2 i SiO2, u koncentraciji od 0,5 i 1 mas % u pet različitih isplaka na bazi vode, na API filtraciju te filtraciju u uvjetima visokoga tlaka i temperature (HTHP). Najbolji rezultat dobiven je dodavanjem nanočestica TiO2 u koncentraciji 0,5 mas %.

• Keywords (english): TiO2 and SiO2 nanoparticles; mud; filtration; wellbore stability
• Keywords (croatian): nanočestice TiO2 i SiO2; isplaka; filtracija; stabilnost kanala bušotine
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Rudarsko-geološko-naftni zbornik
• Numbering: vol. 34, no. 4, pp. 67-78
• e-ISSN: 1849-0409
• DOI: https://doi.org/10.17794/rgn.2019.4.7
• URN:NBN: urn:nbn:hr:169:635773
• Publication: 2019
• Document URL: https://hrcak.srce.hr/228224
• Type of resource: Text
• Access conditions: Open access
• Created on: 2021-04-21 12:59:23