Abstract
In this work, nonionic surfactant NP100 and pine oil influences on the filtrate volume (FV) and the filter-cake thickness (thkns) of microemulsified drilling fluids were studied. A ternary phase diagram was obtained to define the microemulsion region, where a 2k factorial design was used with the addition of four center points and axial points. Twelve microemulsion points were defined and used later in the formulation of the investigated drilling fluids. The results showed that the increase in the surfactant and pine oil’s concentration increased FV and thkns, withthe oil phase being the most influential component in the filtrate volume and the surfactant being the most influential in the filter-cake thickness. Statistically significant models were obtained. The optimal concentrations were determined for the lowest FV and thkns; 45% of surfactant and 5% of pine oil for the filtrate volume (1.3 mL), and 45% of surfactant and 15% of pine oil for the filter-cake thickness (0.64 mm).
Highlights
Oil and natural-gas productions involve drilling wells into the reservoir, and the success of this operation depends, among other factors, on the efficiency of the drilling fluid used
In order to verify the influence of the nonionic surfactant (NP100) and vegetable oil on the formation of the filter-cake and filtrate volume of microemulsion-based drilling fluids, the following conclusions may be drawn:
The microemulsion point corresponding to 45% surfactant and 5% pine oil obtained the lowest filtrate volume (1.3 mL);
Summary
Oil and natural-gas productions involve drilling wells into the reservoir, and the success of this operation depends, among other factors, on the efficiency of the drilling fluid used. TiO2 nanoparticles-bentonite (TNBT) nanocomposites are used to improve the properties of drilling fluids, especially concerning fluid loss and filter cake They act directly to improve the fluid’s lubricity (0.24 to 0.28) [36], as do microemulsions, which provide good lubricity coefficients in drilling fluids (0.12 to 0.20) [35], lower filter-cake thickness, and stabilization of the wellbore [35,37]. They may improve clay- and shale-swelling inhibition for water-based fluids. Tuhlseiyonha-bvaesbedeednruilsliendgdfluueidtos tphreeisrernetdcuecretdaicnoasdtsv, astnatbaigliezsaotivoenrwcohnevnefnatciionngal vadrrioilulisngfoflrumidatsi.oTnhteyyphesa,vaenbdeerneduusceedddeunevtiorothnemirenretdaludceadmcaogsets[,3s9ta–b42il]i.zaCtoionnsiwdehreinngfatchieng mvicarroioemusuflosiromna-btiaosnedtydpreilsl,inagndflureiddsucfoerdmeendvibryonamneonntiaolndicamsuargfaect[a3n9–t,4a2n]. aCqounesoiudserpihnagsteh, e anmoiiclrpohemasue,lsainodn-abdadseitdivdersi,ltlhinisgwflouridksaifmorsmtoedstbuydya tnhoeniinofnluicensucerfsaocftathnet,NanP1a0q0useuorufsacpthanaste, (naonniooinl pichaansed, abnioddaedgdraitdivaebsl,et)haisndwoprikneaiomils (tvoesgteutdayblteheoiiln)flounenthceesfoofrmthaetiNoPn1o0f0tshuerffailcttearnt ca(kneonainodnifcilatrnadtebvioodluemgrea,dianboler)daenrdtopoinbetaoiinl (evnevgiertoanbmleeonitla) lolyn athcceefpotrambaletiodnrilolifntgheflfiulitdesr.cake and filtrate volume, in order to obtain environmentally acceptable drilling fluids
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