Research
of new methods of development of petroleum fields
Nuranbaeva
B. M., Dzheksenbaev E.K., Kaldybaeva N.T., Akashev B.T.
KazNTU afer name of K.I.Satpaev,
Almaty, Kazakhstan
Efficiency of extraction
of oil from oil-bearing layers in all oil-producing countries is considered
today the modern, industrially mastered methods of development unsatisfactory,
besides that consumption of oil products around the world grows from year to
year. Average final oil recovery of
layers over various countries and regions makes from 25-40%. For this reason need of search and
development of effective methods of increase in oil recovery of layers
increases.
It is accepted to call
modern methods of increase in oil recovery of layers all methods of volume
impact on the layer, excluding development of deposits on natural natural modes
or with application of traditional secondary methods of stationary flooding by
the usual raw water. Modern (nonconventional) methods of development of
deposits of oil can be divided on secondary hydrodynamic and tertiary.
In practice secondary
MUN subdivide on traditional and modern. As the traditional understand the
methods of the stationary flooding applied at introduction of originally
designed systems of development (linear cutting, selective or vulgar flooding,
barrier flooding). Unlike it more progressive, modern secondary MUN which are
called hydrodynamic are applied. These methods are a basis of the majority of
MUN since without the debugged system of development and deployment of hydrodynamic
methods effective application of tertiary MUN is almost impossible. Use of part
of these methods is provided by projects of development and without them
achievement of design oil recovery on the majority of fields is impossible.
In recent years methods
of increase in oil recovery with application of microorganisms gain
development. Their prospect, first of all, is connected with simplicity of
realization, the minimum capital intensity and ecological safety. It is
established that microorganisms of layer produce gases and surface-active
substances which improve mobility of oil. Besides, at pumping active silt, as a
result of a blockage the growing mass of microorganisms of high-permeability
zones layer coverage by flooding increases.
As practice shows, the
kompleksirovaniye of physical and chemical, physical and thermal methods of
impact on productive layer promotes effective operation of fields with hardly
removable stocks of oil. Among physical methods vibrowave methods of an
intensification of oil production are more and more widely used. In this group
of methods the technology of the plasma and pulse method which trade tests
showed high efficiency on a number of oil fields is perspective. However,
features and the mechanism of action of technology of the plasma and pulse
influence (PPI) on sheeted system as a whole aren't rather studied now.
In this regard, research
problems on studying of influence of plasma and pulse impact on rheological
properties of high-viscosity oil and filtrational characteristics of productive
layer for the purpose of the subsequent development and justification of new
effective complex technologies of an intensification of production on fields
with hardly removable stocks are actual in oil and gas branch.
World experience testifies
that the demand of modern MUN grows, their potential in increase in taken
stocks is impressive. It is promoted also by that circumstance that cost of oil
production with application of modern MUN in process of their development and
improvement continuously decreases and becomes oil production quite comparable
to prime cost by the traditional industrially mastered methods.
The purpose of this work
is the analysis of efficiency of new methods of development of fields on the
basis of the directed improvement of rheological properties of oil and
filtrational characteristics of a prizaboyny zone of layer.
According to the
classification of modern methods of increase in oil recovery of layers accepted
now the plasma and pulse belongs to group wave methods.
Technological efficiency
of application of methods of increase in oil recovery is characterized:
- additional oil
production due to increase of oil recovery of layer;
- the current additional
oil production at the expense of an intensification of selection of liquid from
layer;
- reduction of volume of
in passing extracted water. In addition extracted oil for the determined period
of time decides by an arithmetic difference, between actual wells on PIV and
settlement production without carrying out PIV (basic production).
At oil production
calculation for expired period the main objective consists only in the correct
definition of basic oil production.
One of methods is on
alternative calculation of technological indicators of the development, based
on physically substantial mathematical models. In this case rather reliable
adaptation of settlement indicators to the actual is possible in the presence
of initial physical parameters and a long history of operation. At reliable
adaptation the method allows to determine production changes by groups of
wells, deposits and is especially attractive by possibility of a quantitative
assessment of interference (interference) of wells. Accuracy of results depends
as on reliability and completeness of initial information, and opportunities of
mathematical model.
As for settlement
methods of an assessment, that, proceeding from a concrete situation, it should
be noted the following. Wells with PIV are dispersed practically on all
territory of a large-scale deposit. Creation of settlement model of objects
even on the certain areas is interfaced to huge amount of works and involvement
of powerful computer facilities.
Besides, so far on wells
there is very scanty geological and physical and geological field information
which part is subject to changes in use wells, in time. As a result, adaptation
of settlement model and receiving reliable expected technological indicators of
development considerably is at a loss. Thus it is represented that results are
most acceptable or their interferences suffer the smallest error for relative
estimates a vzaimovliyakniya of wells, i.e.
In the conclusion it is
possible to note that PIV allows to solve the following problems:
1) increase of
efficiency (acceleration performance) of a well in the presence of pollution of
a prizaboyny zone or small permeability of a collector;
2) expansion of an
interval of inflow (absorption) at a multisheeted structure of object;
3) change of a tension
of rocks of a collector and the change of structure of steam space connected
with it, etc.
The technology is
applied to processing of the prizaboyny zone of layer (PZL) of delivery wells.
Feature of technology is
impact not only on a prizaboyny zone, but also on layer as a whole, thanks to
deep penetration of a seismoacoustic wave into a productive deposit.
Area of effective
application of technology are low-permeability or strongly zakolmatirovanny
terrigenous or carbonate layers. The reservoir pressure and temperature, and
also physical and chemical properties of the nefty aren't regulated.
The selective increase
in permeability of idle part of productive layer is reached when carrying out
pointervalny plasma and pulse influence opposite to the set interval of layer.
The offered technology
is perspective acceleration performance for increase in delivery wells, and
also an oil production intensification in extracting.
PIV influence, provides
high efficiency of physical and chemical processing with the subsequent
purification of layer of reaction products. Flotation of products of reaction
from PZP to a trunk of a well leads to effective cleaning of PZP not only of
reaction products, but also of kolmatant of various origin.
Scope of technology are
terrigenous and carbonate collectors of oil and gas fields.
As a result of carrying
out the analysis, I was it is offered technology based on a kompleksirovaniye
plasma and pulse and physical and chemical influences. Pridlozhenoye the
technology allows to regulate filtrational characteristics of PZP with maximum
efficiency and sufficient extent of coverage of productive layer. ZPAV+PIV -
application in the delivery wells which have opened terrigenous collector; the
technology is recommended to application on VVN fields.
The way of decrease in
anomalies of viscosity of reservoir oil by periodic use of PIV, provides
increase in coefficient of coverage of layer with flooding and stimulates
process of transition of pumped solution in oil.
The way of an
intensification of production on fields of the viscous oil, based on plasma and
pulse and physical and chemical influences, allows to improve filtrational
characteristics of PZP, to increase mobility of reservoir oil and to intensify
work of oil wells.
Thus, PIV allows intensification
oil production at the expense of the combined avozdeystviye on a prizaboyny
zone of the layer including ion-plasma process and pulse electric discharges.
Literature
1. Makhmudbekov E. A.
Intensifikation of oil production /E.A. Makhmudbekov, A. I. Volnov. - М, 1975.
- 264 pages.
2. Akulshin A. I.
Operation of oil and gas wells: The textbook for Technical schools. I.
Akulshin, V. S. Boyko, Yu. A. Zarubin, V. M. Doroshenko. - M.: Subsoil, 1989. -
480 pages.
3. Mirzadzhanzade A. X.
Features of operation of fields abnormal neftey/And. X. Mirzadzhanzade, A. G.
Kovalyov, Yu. V. Zaytsev. - M.: Subsoil, 1972.-200 pages.
4. Ibatullin R. R.
Uvelicheniye of oil recovery at a late stage of development of fields. Theory.
Methods. Practice/Ruble R. Ibatullin, N. G. Ibragimov, Sh. F. Takhautdinov, R.
S. Hisamov. - M.: Open company nedra-Business center ≫, 2004. -
292с.
5. Maksyutin A. V.
Research of elastic wave influence for decrease in anomalies of viscosity
sheeted nefty//Works of the 7th Interregional scientific and practical
conference: Development of mineral resources of the North. - Vorkuta: SPGGI
branch. Vorkuta mining institute, 2009. - Page 128-131.