Banca de QUALIFICAÇÃO: LAÍS SIBALDO RIBEIRO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LAÍS SIBALDO RIBEIRO
DATA : 21/12/2018
HORA: 14:30
LOCAL: Auditório do NUPEG
TÍTULO:
PALAVRAS-CHAVES:

Surfactants, microemulsions, Lost Circulation, LCM, Modeling, filtration, gelation in situ.

PÁGINAS: 167
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

Lost circulation is a serious and costly problem for the oil industry and it may happen during a drilling in permeable formations, natural fractions or caves. To mitigate this lost, gel systems combined with Lost Control Materials (LCM) is used, this combination is called buffers. However, sometimes these buffers are not effective, and there is a need for new technologies to solve this problem. Approximately 85% of the gross weight of the coconut consists of the husks, which is accumulated in dumps or in the banks of roads, then its hernessing becomes necessary. This work aimed to develop a new generation of buffer using surfactant-based gels and coconut fibers in different granulometries, treated with microemulsions, to prevent losses in carbonates, oil-wettable microfractures and to study the interactions between fiber-emulsio, gel-rock, fiber-rock and analyze the capacity of remediate the lost and in situ gelling ability. For the tests with the surfactant-based gels, two anionic surfactants were tested one of them was soap base, used in the systems,1 (S1) and 2 (S2) and the other one was saponified castor oil - SCO, which generated the third system, S3. Two microemulsion systems were tested for the treatment of coconut fiber, one with cationic surfactant (CTAB) with three types of micelles (direct micelle, bicontinuous and reverse), another with anionic surfactant (soap base) at the point of bi-continuous micelle (SB). These fibers was analyzed through the TG-DTA, SEM, XRD, FRX and contact angle analyzes. The buffers were characterized by rheology, weight and filtration. A lost circulation apparatus was developed and used with the better buffer, and an in situ gelling test was performed. The best buffer was S2 with fibbers mesh sizes # 35, # 100 and # 200 because presented a pseudoplastic behavior, with high viscosities and tensions, characteristic of buffers, low filtrate volumes below 10 mL, and a rapid formation of filtercake (15 minutes). In the loss simulator apparatus, the S2 with granulometric fibers # 35, # 100 and # 200, treated with the SB, was able to reduce the permeability by 50% with the minimum mass (50 g) of the studied fluid. The fibers treated with the SB, presented affinity for the developed gel and allowed the gel spread on the surface of the pores of the rock, and presented the chemical affinity for the surface, facilitating the process of deposition and buffering of the fractures. For this reason, fibers treated by SB were chosen as the LCM of the new product. In situ gelation test showed that at 70 ℃ the gelling happen in 40 seconds, excellent result, making operation quick, efficient and less costly, with less probe time support.

MEMBROS DA BANCA:
Interno - 347289 - AFONSO AVELINO DANTAS NETO
Externo ao Programa - 1753094 - ALCIDES DE OLIVEIRA WANDERLEY NETO
Externo à Instituição - TAMYRIS THAISE COSTA DE SOUZA - UNIFESSPA
Interno - 347057 - TEREZA NEUMA DE CASTRO DANTAS