Increasing the flooding efficiency at Karazhanbas field

The article presents the main geological reasons for the emergence of problems with the waterflooding efficiency at Karazhanbas field, as well as an overview of the main methods used to increase the coverage of its productive formations by development: periodic injection of steam and water into the formation, alignment of the injectivity profiles of injection wells, as well as gel-polymer flooding used in the neighboring field confined to the same productive formations. The results of a differential analysis of the development indicators of individual objects of this field are described with the aim of selecting areas of influence in them using the indicated methods. The article describes the results of the analysis of the effectiveness of the application of the WFP method of injection wells in the selected areas of this field.

Applying geological and mathematical modeling to predict fluid influx in horizontal wells (the case of Kalamkas oil field)

One of the ways to increase well oil production is to reduce the filtration resistance of the bottom-hole zone. Along with well-known stimulation methods, such as modern methods of treating wells bottom-hole zone, side tracking (drilling of lateral horizontal boreholes) is of great interest. The following works have been implemented Kalamkas field: a complex of geological, geophysical and field exploration; correlation schemes to track the lithology of the formation; clarifying structural maps and engineering maps; justifying activities to select one or more wells for horizontal drilling; hydrodynamic calculations and estimating their flow rate.

Cement-polymer materials for well casing

The work shows the efficiency of using the SСADC reagent as an additive in cement-polymer mixtures. It also outlines physicomechanical properties of the cement slurry and the stone formed on their basis at temperatures of 22 C and 80 C. The main regularities of the formation of structures of various levels in cement-polymer solutions are revealed, depending on the degree of filling and the type of introduced modifications of the SСADC reagent. It was found that an entangled fibrous structure is formed between the hydrated cement minerals and the complex additive SСADC. At a concentration of 0.2%, it provides a self-healing effect for a damaged cement stone, and also improves the properties of cement-polymer grouting mixtures, contributing to a decrease in the filtration rate of the solution to 30%, an increase in bending strength by 25-27% and by 36-42% in ultimate strength for compression.

Summary on the application of the gravitational method to eliminate intercasing pressure

This article provides an analysis and summary of the experience of using the gravity method for eliminating annular pressure in the wells of the subsidiaries and dependent companies of JSC NC KazMunayGas. The analysis used the actual data obtained immediately after the elimination of annular pressure in wells using a compositional composition on a hydrocarbon basis by gravity replacement of annular fluid.

Aquathermolysis of high-viscosity oil terrigenic sediments in the presence of iron oxide (II, III)

Nowadays, it is especially important and relevant to improve the efficiency of existing methods of enhanced oil recovery, in particular, thermal methods using water steam. The use of catalysis at the stage of development of unconventional hydrocarbon fields, namely super-viscous and bituminous oils, will allow solving this problem. This work is devoted to the study of the transformation of heavy oil from the Ashalchinskoye field in the process of catalytic aquathermolysis. The oil samples were extracts from sandstone, which was subjected to thermal steam treatment in a high-pressure reactor at temperatures of 200 and 250C for 24 h. Nanosized iron (II, III) oxide in complex with a hydrogen donor was used as a catalytic composition. According to the results of SARA-analysis, it was found that at a temperature of 200C, iron oxide does not show its catalytic properties, and there is no noticeable improvement in the composition of heavy oil. The destruction of resins and asphaltenes is observed after thermocatalytic treatment at 250C. This leads to the enrichment of oil with lighter hydrocarbons, which is confirmed by GC-MS data of the saturated fraction of oil. All this provides a significant decrease in the viscosity of heavy oil compared to the non-catalytic process from 1140 cP to 37 cP The formation of coke-like substances adsorbed on sandstone as a result of thermocatalytic action at 250C was revealed by the results of TG-DSC.

Analysis of the effectiveness of dual injection at Kalamkas field

The article analyzes the results of pilot field tests and the technological assessment of the introduction of technology for simultaneous and separate injection at Kalamkas field of Mangystaumunaigas JSC. The functional tasks of simultaneous-separate injection and the requirements for the technical conditions of the equipment used for transfer to simultaneous-separate injection are considered A relevant and significant point in the implementation of technology for simultaneous-separate injection is that the injection into two layers is carried out through one wellbore using special equipment, the main element of which is a packer that separates the layers from each other and provides the possibility of operating each of them in accordance with the specified technological mode.

Estimation of quantitative criteria of carbonate reservoirs of triassic deposits

This paper discusses the boundary values of the reservoir properties of carbonate rocks of the Triassic sediments of South Mangyshlak, which are important for the interpretation of production geophysical data and for perforating and blasting operations. In terms of lithological composition, Triassic deposits are represented by two types of commercial reservoirs terrigenous and carbonate. Carbonate reservoirs are localized in the volcanic-dolomite and volcanic-limestone strata of the Middle Triassic. These rocks are characterized by a complex type of reservoir: porous-fractured, porous-cavernous and fractured. Sediments of the Upper Triassic occur with erosion on the Middle Triassic sedimentary complex and are represented by alternating tuffaceous, silt-sandy and mudstone rocks. Polymictic sandstones are oil-saturated to varying degrees; oil deposits are confined to them. To substantiate the quantitative criteria of the reservoir, the results obtained during special laboratory studies of the core were used. Filtration studies were carried out, where physical and hydrodynamic characteristics were determined when oil was displaced by displacing reagents. The obtained parameters were used to construct correlations collector non-collector. Using the relationships between the reservoir properties of the reservoir, the dependence of the porosity and permeability on the residual water content, as well as open porosity and permeability on the dynamic porosity, the boundary values were determined.

Thermocracking of a heavy fraction of the oil residue in a mixture with shale

The process of tar thermal cracking in a mixture with crushed oil shale to obtain components of motor fuels and raw materials for the process of thermal cracking is investigated in this paper. The optimization results of technological parameters (shale concentration, temperature, and duration) are presented and the material balance (mass.%) of the process is made. It was found that during single-stage processing under relatively mild conditions (5 MPa, 425C, feed space velocity of 1.0 h-1), a deep destruction of tar is achieved (the yield of the gasoline fraction from boiling point to 200C is ~12 wt.%; medium distillates with boil. point 200370C-43-44 mass.%; raw materials for thermal cracking with boil. point above 370C ~15-16 wt.% on per the original tar). The generating coke-like products and the V and Ni contained in the raw materials are deposited on the mineral part of the shale and removed from the reaction zone with the liquid products of the process.

Effective EOR methods in high-viscosity oil fields: cyclical GEL-polymer flooding and ASP flooding

The presented work discusses increasing oil recovery factor using physicochemical EOR methods. This article presents the field pilot tests results related to cyclical gel polymer flooding technology as applied under the conditions productive reservoirs rich in high-viscosity oils (viscosity in reservoir conditions above 300 mPa s) of the Buzachi North oil field, extending the boundaries of application of these methods. The work used the methods of hydrodynamic modeling, mathematical analysis; the necessary parameters of fractures and super reservoirs for calculating the working volumes of the injected compositions were estimated using tracer studies.

PSL zoning and material selection of tubing pipes at Ozenmunaigas JSC fields

The relevance of this work is caused by the need to reduce operating costs in the group of companies of NC KazMunayGas JSC in general and in Ozenmunaigas JSC in particular by increasing the service life of the tubing used. In this regard, the purpose of research and testing was to select the optimal tubing material for each group of wells. Correct grouping of wells (PSL zoning) is also important for the selection of the optimal tubing material. The article indicates the methodology and characteristics for the distribution of wells into groups (PSL zoning). analysis of the causes (wiping, corrosion) contributing to the rapid wear of tubing in the fields of JSC Ozenmunaigas, and recommendations for their solution.