Relationship between rheological properties and low-damaging potential of drill-in fluids

Relationship between rheological properties and low-damaging potential of drill-in fluids

Autori: G. Gallino, M. Vanelli
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 2 - Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English

Abstract
While drilling oil and gas wells a special fluid, referred to as “mud”, is pumped into the hole and forced to circulate as is reported schematically in Fig.1 (on the left). Mud selection and optimization can represent a key factor for the success of drilling operations and many types of mud have been developed. A “drill-in fluid” is a “low damaging mud” which can be used for drilling through productive formations (pay-zone), especially when long horizontal sections need to be drilled. The continuous growth in the drilling of horizontal wells during the last ten years has led to a parallel increase of interest in drill-in fluids development and implementation.
Drill-in fluid characteristics are designed in order to meet both drilling and completion requirements. As drilling fluids, drill-in fluids must provide cuttings transport and suspension and contribute to hydraulic optimization, borehole stability and bit lubrication. As “completion fluids” they should be formulated in order to prevent undesirable chemical-physical interactions between the components of the drill-in fluids and reservoir rock that can damage the productivity of the formation (“formation damage”).

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The Italian Society of Rheology (SIR) organizes every two years the Italian Rheology Conference, which is the meeting point of the National and International rheological community to promote knowledge and discuss research in the field of rheology. The Conference consists of keynote lectures, oral communications and posters on topics related to all the thematic areas of rheology. The XIX edition will be held in the conference rooms of Plesso Belmeloro, in the city centre of Bologna, in June 16th-19th, 2026. Book your accommodation in Bologna well in advance, the city is a famous tourist destination and has limited availability of accommodations!

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