SU829872A1

SU829872A1 - Method of isolating formation water in well

Info

Publication number: SU829872A1
Application number: SU792797713A
Authority: SU
Inventors: Валентин Иванович Павлюченко; Рудольф Гиндулович Шагиев; Марат Фазылович Каримов; Виктор Васильевич Чеботарев; Виктор Ильич Мархасин; Вячеслав Александрович Телков
Original assignee: Уфимский Нефтяной Институт
Priority date: 1979-07-16
Filing date: 1979-07-16
Publication date: 1981-05-15

Description

Изобретение относитс к нефтегазодобывающей промышленности, в частности к способам изол ции пластовых вод в скважинах.The invention relates to the oil and gas industry, in particular to methods for isolating formation water in wells.

Известен способ изол ции пластовых вед в скважине путе закачки в него полимеров органических кислот и солей поливалентных металлов, взаимодействующих с образованием| 1 ,.There is a method of isolating reservoir veds in the well by injecting polymers of organic acids and salts of polyvalent metals into it, which interact with the formation of | one ,.

Однако этот способ не позвол ет достаточно эффективно изолировать пласт. . , . ,However, this method does not effectively isolate the formation. . , ,

Известен способ-изол ции пластовых вод, в скважине путем закачки в обводненный пласт гидрофобной эмульсии 1;2 .The known method is to isolate formation water in the well by pumping a hydrophobic emulsion 1; 2 into the flooded formation.

Недостатком данного способа вл :етс закупорка нефтегазона.сосной части пласта при наличии в нем остаточной или погребенной воды.The disadvantage of this method is the blockage of the oil and gas piping of the formation in the presence of residual or buried water.

Цель изобретени - повышение эффективности изол ции.The purpose of the invention is to increase the insulation efficiency.

Указанна цель достигаетс тем, что после закачки гидрофобной эмульсиThis goal is achieved by the fact that after the injection of a hydrophobic emulsion

в.обводненный пласт дополнительно ввод т. газовый конденсат.A watered formation is additionally introduced. Gas condensate.

Способ осуществл ют следующим образом.The method is carried out as follows.

Claims

A calculated volume of the hydrophobic emulsion of the previously mentioned composition is prepared near the well, on which work is planned to carry out the isolation of the places of formation water inflow. The technology of preparation of the hydrophobic emulsion is simple and reduces to the displacement of certain volumes of an aqueous solution of the surfactant OP-10 with the addition of a stabilizer CMC-600 and gas condensate. Mixing is carried out to obtain a homogeneous composition of the mixture. Then, the hydrophobic emulsion is pumped into the reservoir through the pumping and compression-waste pipe column, followed by keeping it in the reservoir for 24-36 hours. Next, the decomposed hydrophobic emulsion is removed from the gas pumping part of the reservoir and the gas condensate is injected into the reservoir. Gas injection into the watered part of the reservoir, filled with a hydrophobic emulsion, is carried out with the aim of its viscosity. After that, the well is maintained for 24 hours to strengthen the structural and mechanical properties of the hydrophobic emulsion. Then, the well is blown at small. depressions until complete removal of gas condensate residues and the well is brought to a mode that ensures the achievement of an extremely anhydrous flow rate. An extremely anhydrous flow rate is considered to be achieved if, during operation, extreme pressure is not observed to destroy the core screen (i.e., there is no violation of the structural and mechanical properties of the hydrophobic emulsion). Thus, the introduction of a gas covdensate into: the reservoir after a hydrophobic emulsion increases the viscosity of the latter by a factor of 3-5, increases the stability of the hydrophobic emulsion to dilution with water and improves its structural and mechanical properties. This method of isolating places of inflow of reservoir water into a gas bar with the use of a hydrophobic emulsion, which is thickened directly in the watered part of the formation, does not impair the reservoir properties of the productive formation. The hydrophobic emulsion, thickened under inplast conditions, is practically not filtered from the formation, is stable to decomposition and dilution by formation water, and is easily adjustable in viscosity. The use of a hydrophobic emulsion with its thickening under reservoir conditions allows an extremely anhydrous well flow rate to be increased by creating an artificial bottomhole screen. Use as a thickener gas condensate contributes to the recovery of reservoir properties of the bottomhole formation zone. Claims of Invention A method of isolating formation water in a well by pumping a hydrophobic emulsion into a water-bearing formation, characterized in that, in order to increase the effectiveness of the insulation, after injection of a hydrophobic emulsion, a gas condensate is additionally introduced into the water-filled formation. Sources of information taken into account in the examination 1. USSR author's certificate number 492645, cl. E 21 V 33/13, 1973.

2. Umrikhina, Ye.N., Blazhevich, V.A. Izoly, inflow of formation water in oil wells, M., Nedra, 1966, p. 70-79 (prototype).