The article deals with theoretical and practical issues of improving the efficiency of operation of high-water cut oil wells by developing and applying double-acting pumping systems based on electric submersible pumps. This combination is providing down-hole gravitational separation of oil and produced water, lifting low-water-cut oil to the surface with simultaneous injection of most of the separated water into the absorbing formation without lifting to the surface. Moreover, it is providing low-cost regulation of the ratio of the volumes of the lifted product and the injected water, as well as monitoring the quality of the injected water with the required frequency.

In this work, the capabilities of the Nuclear magnetic resonance (NMR) method fordetermining the petrophysical parameters of reservoir rocks were considered. For thispurpose, rock samples from several oil fields have been investigated. NMR investigationmethod was used as one of the rapid methods for assessing the potential properties ofreservoir rocks without causing damage to the studied models. It was shown that the resultsof measurements on the cuttings agree with the results obtained by core samples. It wasrevealed that this method can be used for quantitative assessment of the content of clayminerals and determination of their type. Moreover, the nature of the dependence of the porosity parameter on the NMR porosity, which satisfies the well-known equations, has been experimentally established.

The change in reservoir pressure and its effect on the physical properties of the reservoirunder the development of the hydrocarbon fields has always been of great interest to many researchers in the oil industry. One of the tasks of core research is to obtain interpretation models that provide quantitative processing of well logging data. The effects of the change of effective pressure on the reservoir properties of productive reservoir rocks in the simulation conditions of the reservoir are studied. Reservoir conditions were simulated, and under these conditions, the main physical properties of each sample were determined. The field development process was simulated by a decrease in reservoir pressure, accompanied by an increase in effective pressure by 10.0 MPa. This has shown that we can expect a decrease in the average formation porosity (φ) value by 0.05 absolute percent or 0.24%, and a decrease in the permeability (K) by 0.24 md, or 0.14 %. The data on changes in some petrophysical parameters are analyzed from the point of view of their dependence on changes in the effective pressure of the reservoir, obtained in the first approximation of the assessment of these changes

Зффективность разведки месторождений нефти и газа территории Ирака в значительной степени определяется уровнем и объемом сейсморазведочных работ, состоянием техники и методики геофизических исследований скважин (ГИС), достоверностью решения по материалам ГИС задач по выделению коллекторов и определению их параметров, которые в дальнейшем используются для подсчета запасов нефти и газа.Комплекс ГИС выполняемый з скважинах Ирака в последние годы в достаточной степени стабилизировался п повсеместно включает независимо от типов разрезов и коллекторов практически все известные и освоенные промышленностью виды каротажа (КС, БК, ПК, АК, ГК, СП, НК, ГГКП и др.).Однако, с ростом глубин разведуемых горизонтов, усложнением геолого-техш1ческпх условий вскрываемых коллекторов месторождения Восточный Багдад эффективность геолого-геофи-зическпх работ по исследованию продуктивных пластов, оценки их параметров недостаточна.Дальнейшие резервы повышения эффективности изучения сложных коллекторов и залежей углеводородов связаны с совершенствованием технологии проведения исследований, оптимальным комплексированнем методов ГИС с отбором керна, опробованием и испытанием пластов, обработкой на ПЭВМ и геологической интерпретацией полученных мaтepиaлов.Цель работы заключается в повышении эффективности изучения сложных коллекторов месторождения Восточный Багдад территории Ирака, разработке методики определения подсчетных параметров: эффективных толщин, коэффициентов пористости и нефтегазонасыщенности, глинистости, положений межфлюидных контактов с достоверностью, удовлетворяющей требованиям подсчета запасов нефти и газа и подготовки залежей к эксплуатации.

Knowledge of the properties of reservoir oil is necessary when calculating reserves, creating projects development, creating hydrodynamic models of development objects. Reservoir oil properties are determined by downhole samples taken, as usual, from exploration and production wells. In some cases, it is impossible to create conditions for the selection of high-quality downhole samples at exploration and production wells. In such cases, we must use samples of surface oil to obtain information about the reservoir properties of this oil. In this work and as a result of the analysis of the accumulated data, dependencies with a high degree of correlation were obtained, which make it possible to quickly assess the expected parameters of reservoir oil, having only the density of surface oil.