33 research outputs found
Effects of wellbore stability to sand production
No full textThe paper describe a series of laboratory experiment to observe the effects wellbore stability to sand production. The wellbore stability is the most important of aspect that should be considered during and production activities. The paper will presented only the effect of wellbore stability due the structure design at production zone i.e. perforated cased wellbore. The physical model has been design as wellbore where different borehole angle and perforation parameter (shot density and perforation pattern) has been impose to see the effect on the stability and sand production. Generally all models fail and sand particles were produced and found that stable perforated wellbore produce less sand particles
Improvement of blended cement characteristics as possible alternative for oil well cement
No full textThe paper presents the results of the laboratory studies on locally produced blended cement as an oil well cement. The results show that the blended cement has less free water, less fluid loss, better strength development but shorter thickening time than G cement. In addition, the results also show that there is a great increase in strength development by adding the palm oil fly ash. However, there will be a decrease in strength if more than 15% of the fly ash is added to the cement. The cost per bag of blended cement is cheaper and there will be a saying of about 48% of the cement material cost if the blended cement is used to cement an average oil well at 8000ft depth. In general, the blended cement showed a better results than G cement as the water cement ratio been varied even though as the ratio increases the free water and fluid loss also increases. Blended cement proves to be the alternative choice for the replacement of G cement in cementing job, particularly for the shallow well due to the shorter thickening time
Perforation parameters consideration for stable petroleum wellbore
No full textThe paper describes a series of laboratory experiment to observe the effects of perforation parameters and fracture zone on the wellbore stability. The wellbore stability is the most important thing that should be considered during drilling and production activities. The paper will be presented only the on effect of wellbore stability due the structure design at production zone i.e. perforated cased wellbore. Sandstone has been designed as wellbore where different perforation parameter has been imposed to see the effect on the stability i.e. shot density and perforation pattern. Then the effect of wellbore instability on sand production also analysed carefully. Generally all models fails and sand particles were produced and found that stable perforated wellbore produce less sand particles
Effects of mud contamination to cement casing bonding
No full textOne of the failure in petroleum well cementing operations is due to the effect of mud contamination on cement slurry while displacement process. Mud material, especially mud additives have a great influence towards the cement-casing bonding and the cement compressive strength. Since then, it is necessary to observe the effect of the mud contamination to the cement bonding and strength. Cement slurry which has been contaminated by the mud is then cured for 24 hours within the temperature range of 150-250oF and pressure range of 2000-3000 psi before it is tested for the compressive strength and bonding. From the laboratory experiments, it was found that increasing in the mud rheologies especially yield point will reduced the cement bonding and compressive strength significantly and it is compulsory to control the mud rheologies to ensure the whole cementing operation reaches the optimum stage with the adequate cement strength
A Novel Approach for Predicting In-situ Breakdown Conditions for Wireline Mini-Fracture Testing
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Laboratory Scale Studies to Understand the Variation of Fracture Toughness with Acoustic and Other Rock Mechanical Properties
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