Possibility of controlling the exploitation of oil and gas with geophysical methods and perspectives of their development (on the sample of Azerbaijan’s field)
Seyidov Vagif Mirgamza oglu
Summarizing the geological and petrophysical data of oil-gas field of Azerbaijan and considering the modern condition of development of control techniques of GIW, the following ways were suggested to increase the efficiency of hydrocarbon fields development: a) the selection of optimal methods of GIW controlling systems; b) the development of new interpretive methods of GIW data for the study of energy oil and gas fields, reservoir operating conditions, operating conditions used in the wells, collector properties of layers, evaluation of reservoir pressure, etc.; c) the definition of technology and sequence control of the development of suitable models GIW technique method; d) selection of optimal methods of stimulation to maximize the extraction of hydrocarbons from the oil and gas fields.
In case of monitoring the development of oil and gas fields by GIW methods should conduct the research of using the full set of GIW techniques. The complex of GIW techniques used for the studying of geological events must include in itself the most effective methods. Therefore, the thesis describes the conditions that increase the efficiency of the set of GIW. At the same time analyzed factors that may affect the methods are widely used by the GIW controlling systems.
Regarding of it were specialized the geologic events and for each of them were specified the recommended methods of GIW systems. The proposed facilities are not in the conventional form – complete and specific, but in a different from; the basic, additional and perspective, as well as annual data used by GIW methods. In our opinion, this approach to the choice of the GIW systems will increase in its efficiency.
To accurately determine the properties of the field of geological and pertophysical data of layer at first was defined its nature, and then to hold the necessary geological event and prepared for new methods of interpretive approaches to GIW:
- infrared logging invention for measuring the temperature changes along the axis of the borehole, which can be used in the petroleum industry, which is necessary to measure temperature changes in bore holes. The object of the invention is the creation of the tracking of temperature changing along the axis of the bore holes, to study the geological conditions that impede the process of extracting oil from reservoirs. The problem is solved on the basis of the effect that any hot object emits infrared radiation including those which located in the reservoir (in the space of rocks) oil, water, gas, and its mixtures. Transferring the infrared radiation into visible light die to special equipment, you can get pictures of the studied subject in a dark environment, which allows applying this methods in the study of the drillings interval of the bore holes.
- had developed new methods for the determination: measurement of porosity in the well operation, changes in salinity of formation water, changing the conductivity of rocks, reservoir pressure in any layer modes of well, predicting the initial field of GIW data. Was constructed the desired curve (pseudo log) for different methods give GIW foundation fields of old wells, estimated oil-transferring of layers of concealed facilities perforation intervals and the change of the thermal characteristics etc.;
The thesis shows also the methods of monitoring the development of the field of GIW and the results established the basic elements and determined the sequence of its constructions. In developing the model input data are used GIW data and geological parameters characterizing the field and established mathematical connection between them. The constructed model is as the primary base is the reservoir model. Then were developed a basic petrophysical model reflected the dependence of the change of the oil circuit and oil-satisfying.
In developing the petrophysical model is taken into account the material balance equation of the reservoir, the property changes of characteristic parameters in the design. This model defined by the lower and upper limits of the data, established the main factor affecting the accuracy of the model field and the formation of the processes, along with those concerning the conditions for the development of this model.
By the development of oil and gas fields is observe a decreasing or even cessation of flow rate of oil extracted from reservoirs. The one of the reason is that the oil located in the capillaries of the rocks has high molecular weight carbohidrogen that contribute to the formation of plug. Plugs formed on the surface of the outside walls of the capillary tubes, as a result of pseudo crystals. At the reservoir have different effects in order to prevent the reduction or full cessation of flown rate for this reason. Very often these effects do not give the expected results. This is due to their physical properties. The effective method of solving this kind of problem is given in this dissertation. Taking into account the formation of plugs and their properties were fully explored the influence of ultrasonic vibrations (waves) in such areas of the section. As result, studies have shown that the effectiveness of obtained at a frequency of 7.28 Hz (10 m), 2.87 Hz (100 m), 1.44 Hz (200 m), 0.98 Hz (300 m), 0.71 Hz (400 m) – 0.53 Hz (500 m) seismically waves and from 0.33 Hz to 552 Hz acoustic waves.