In the oil industry, crude oil emulsions appear very frequently in almost all activities, starting with drilling and continuing with completion, production, transportation and processing. They are usually formed naturally or during oil production and their presence can have a strong impact on oil production and facilities. In this paper we addressed the problem of oil emulsions present in a reservoir with unfavorable flow properties. It is known that the presence of emulsions in a reservoir can influence both flow capacity and the quality of its crude oil, especially when they are associated with porous medium�s low values of permeability. Considering this, we have introduced a new procedure for selecting a special fluid of fracture. This fluid has two main roles: to create new flow paths from the reservoir rock to wells; to produce emulsion breaking of emulsified oil from pore of rocks. Best fracturing fluid performance was determined by laboratory tests. Selected fluid was then used to stimulate an oil well located on an oil field from Romania. In the final section of this paper,we are presenting a short analysis of the efficiency of the operation of hydraulic fracturing stimulation probe associated with the crude oil emulsion breaking process.

This paper presents a lahoratory based method that minimizes the water infl:ex info the production wellóore by controlling induced Eines and plugging mechanisms . Rock pore size distribution, lnduced partiele size distribution and their wettability, relative permeabílity before and after m ud circulation will be the milestones in the proposed proces. INTRODUCT. IONFines migration is a recogn ised and very unpleased formation damage mechanism that is always present in sandstone reservoirs and causa permeability impairment. However, in some conditions , this mechanism could improve the production welfis performance , that is a reduction of water cut .Fonnatian fines may be defined as unconfined solid pa rticíes made up of clay cninerals or nonclay species deposited over geological time or introduced during completion or drieling operations''2. The present papers deals jast w itti the particles introduced into the formation during different operatians_ Theoretical, migration and plugging processas presume a displacement and settiement of a solid partiele to the gore constriction w ith a Iess dimens ion than the pa rtiele dïmension or the simultaneously settiement of more particles to one pore or pure constriction witti higher dimension.To be used in our benefit , fines migration must be very welf known and carefully controlled, that means a comprehensive program spread out both info the specialised lab and field . This paper offer a laborato ry procedure to control introduced fi nes migration mechanism witti the view of a beuer performance of high water cut production Wells . BA!CKGAQUNDMost investigators of fines migration mechanism have concentrated on single phase flow through porous media 2~12' ' 4. Understanding fines displacement and plugging mechanism during two-phase flow is the key to prevention of product ion problems. Only a few data exists on fines migration during two phase flow .Laboratory fines migration tests performed witti more than one phase present pose special interpretation problems due to relativa permeab ility effects, lome of theet detailed in references 1, 7 and 1 1 .The proposed laboratory procedure includes the following milestones to con trol the induced Eines migration mec hanism : Fines wettability was determined by a restored state technique7. Although the fines used in experiments veere non-swelling clays, which are considered to be water-wet, in multiphase flow this character could be changed by a Jonger contact between the partiele and the original non-wetting fluid, that is why we performed wettab ility determination tests on the fines and fluids used along the protocol . The wettability determination confirmed our supposition that is tee water-wet fines character .Two-phase flaw dynamic displacement experime►ets were conducted to p redict potential fines problems10 " ' . Two sets of data veere generated, that is brine w ithout and witti dispersed fines particles . In these tests, samples veere sat urated witti brine and flooded witti oil. Effective permeability to oil at...