Permeability Of Cement Selective Water Shutoff

Permeable cement is a new-style Portland cement material. From the day that the technology was put forward, it was paid attention widely in the many fields of the petroleum industry. Permeable cement can be applied in various field of the petroleum industry such as well cementation, sand control, water shut-off , oil production and so on. This paper makes use of the permeable cement and the organic selectivity gel to block off water selectively. The basic clew is that utilize the permeable cement to block off the near well stream path and the organic selectivity gel to block off the far well water produced pore passage. In order to open the oil stream channels, the hot oil was used or the steam was used to drive and dredge the interior channels of the hardened cement. At the same time, the high oil wetting peculiarity and the great permeable selectivity of the permeable cement are also the reason of achieving the oil stream flowing smoothly. The permeable cement can't damage the oil layer as well as can block off the water , it is a selective water shut off material of good selectivity, high penetration factor, great strength , low cost and good prospect.This paper synthesized the oil dissolved material GS-5 and mixed with the inorganic material MD to prepare the add-permeability additive GS-5e. At the same time, in order to increasing the penetration factor further and building up the effect of the add-permeability agent, this paper developed the assist-permeability additive CJW which is a fibred-shape material containing the inside capillary tube and which can intensify the connection of the pore to pore and promote the GS-5e to improve the penetration factor of the subtle cement. The permeable cement can adjust the oil penetration factor and the compression strength of the subtle hardened cement in the scope of the 0-0.5um2 and 4MPa-6MPa respectively. The permeable cement has the good phase selective permeability, which is high penetration factor for oil and low penetration factor for water, and reach to the aim of blocking off the water selectively. This paper also used the SEM and energy spectrum analysis to study the peculiarity of the permeable cement adglutinate and the pore structure. Through the study, the way to increase the permeability of the subtle cement isdefinite, so supply the theoretic pursuant to studying the better actor and establish the basic to developing the treating compound for the permeable subtle cement which is applied with various well condition.We also developed the SXN selective temporary blocking agent, they will react to each other and form the organic gel, it has good property of water shutoff, when the temperature is above 50℃, It has good temporary blocking and breaking down effect.The permeable cement water shutoff is quite a developing potential technology and need to make it perfect.