Shadrach Ogiriki | Afe Babalola University, Ado-Ekiti (original) (raw)

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Papers by Shadrach Ogiriki

Nigeria is gradually advancing into the secondary stage of oil recovery, necessitating preparatio... more Nigeria is gradually advancing into the secondary stage of oil recovery, necessitating preparation for tertiary oil recovery especially enhanced oil recovery (EOR). Considering the high cost of EOR agents, it is imperative to investigate the performance of available local EOR agents against foreign agents when these agents (such as surfactants and polymers) are used in combination. Oil displacement experiments were thus conducted using foreign and local surfactant-polymer (SP) and alkaline-polymer (AP) agents on Nigerian crude and their results were compared. The experiments entailed using different percentage ratios of surfactants to polymers and alkaline to polymer. Four kinds of Alkaline were also used to displace residual oil from sand to find out what type of alkaline displaces oil better. The displacement efficiencies obtained from experimental results showed that the foreign EOR agents performed better than the local EOR agents. For the SP agents, the foreign SP displaced above 90% of both light and medium crude at about 45/55 percentage and 0/100 percentage respectively. The local SP displaced a maximum of about 35% of the light crude and 75% of medium crude at an SP ratio of about 20/80 for both cases. The use of Alkaline-Polymer results showed that the foreign agents performed better than the local agents. The maximum displacement efficiency of the foreign AP was 78.13% at a ratio of 40/60 while the maximum displacement efficiency of the local AP was 64% at a ratio of 60/40. The displacement of residual oil experiments performed using four kinds of alkaline showed that potassium hydroxide (KOH) enhances recovery better than NaOH, Na 2 CO 3 and Palm bunch ash (a local source of alkaline). It was also observed that oil displacement efficiency increased as pH value of the alkaline increased.

Drilling mud is a vital component in rotary drilling operations. For a successful drilling operat... more Drilling mud is a vital component in rotary drilling operations. For a successful drilling operation to be achieved, drilling fluid used has to be continuously monitored and controlled. It is very easy to determine the properties of drilling mud at surface conditions but it does not represent bottom-hole conditions. Its properties change due to elevated temperature and aging time at the subsurface and these in effect, may cause series of down hole problems. A laboratory investigation of the effects of temperature and aging time on water based mud was made with aging cell and an oven, mud balance, API filter press and sand content kit. At days 1, 3, 5 and 7, filtrate volume, at 100 psi and room temperature, yielded 21, 20, 17 and 15 ml respectively. On the other hand, the viscosity of the aged mud sample increased from 27 sec/quart at 0 hour to 29, 30, 31 and 32 sec/quart for days 1, 3, 5 and 7 respectively. From the filtrate volume, a thin filter cake was deposited. It was observed as well that viscosity and filtrate loss decreased with the increase in aging and the effect diminished with the increase in aging time, but density and sand content increased with increase in aging time. Finally, it is drawn that temperature affect some of the properties of drilling mud at the subsurface such as density, sand content and most especially viscosity and filtration property. This led to a conclusion that aging affects the properties of drilling mud and its effect diminish with increase in time.

Petroleum and Coal, Dec 2017

Formation damage is a major problem experienced in the operation and development of petroleum res... more Formation damage is a major problem experienced in the operation and development of petroleum reservoir. Its occurrence, occasioned with the release of particles, water, emulsions or scales, hitherto impairs the hydrocarbon delivery/transport system. Formation or skin damage impedes flow of fluids into the wellbore and cause low permeability, hence reducing the productivity of the wells. The production loss directly reflects the economic loss due to formation damage. In the extreme, damage may cause the Well to be uneconomic and be shut-in. The objectives of this project was to determine Stimulation C andidate for three (3) Wells in the Niger Delta Oilfield, using the R ratios, stimulate the candidate wells and make comparison between the wells with regard to the Pre-Stimulation

Petroleum and Coal, Dec 2017