Kazakhstan journal for oil & gas industry

Background: It is difficult to imagine the modern world without hydrocarbon raw materials. Oil and gas production is not only the basis of a powerful fuel and energy complex but also the main source of foreign exchange earnings and a leading component of the budget for many countries. Carbonate rocks strike the imagination by their diversity, but at the same time they cause many problems: they are extremely variable from the point of view of reservoirs. The main problems of productive carbonate members are heterogeneity; distribution of reservoirs in the form of lenses with different configurations and strikes as well as hydrodynamic connections between the lenses is often chaotic. All of the listed problems of carbonate reservoirs are associated with secondary processes.

Aim: The project aims to assess the reservoir properties of carbonate rocks from the point of view of facies zoning on the example of Ovinparm rocks.

Materials and methods: In this work, we used: rock material from 8 wells (475 m), 14 wells with hydrodynamic data and a 3D seismic cube.

Results: Based on the data obtained, the principles of facies diagnostics of the epicontinental platform deposits of were developed, facies of epicontinental platforms were identified, rock material was linked to logging data, a facies model and a facies map were built, a sequence stratigraphic analysis was carried out, and the regularity of the selective nature of the manifestation of secondary processes depending on the characteristics of the conditions for the accumulation of facies of epicontinental platforms was revealed, promising zones were identified taking into account the facies zoning and the intensity of the passage of secondary processes in the study area.

Conclusion: By understanding how the reservoir properties are related to carbonate depositional conditions, we can predict the most interesting zones and determine the main secondary processes leading to such improved or degraded reservoir properties.

Background: Cementing of the production column is an important stage of well completion, which in turn requires the correct selection of the formulation of grouting solutions that ensure the durability of well operation.

Aim: In this article, the analysis of the main factors affecting the quality of well cementing at each stage is carried out, and the impact resistance of grouting materials in the bottom-hole zone of the well is considered in detail.

Materials and methods: The method of assessing the impact resistance of grouting materials by the magnitude of impact strength is described.

Results: The results of research work carried out on the basis of this method with reinforced grouting solutions used to increase the specific impact strength of cement stone are presented.

Conclusion: Experimental studies have shown the effectiveness of polypropylene fiber and building micro-reinforcing fibers at concentrations of 0.25 and 0.5%.

Background: In Russia, as well as in the whole world, the number of oil fields that at the last stage of development and characterized by a high water cut of the production is growing. In order to extend the period of their cost-effective operation, a transition from classical waterflooding to the use of chemical methods to enhanced oil recovery (hereinafter - EOR) is required, which implies a preliminary assessment of their potential effectiveness.

Aim: To select and evaluate chemical compositions, test on core materials with subsequent recommendation of effective compositions.

Materials and methods: This paper reviews a description of the SWCTT and PITT and evaluation is made of the place of these technologies in the chain of implementation of EOR from laboratory experiments to commercial implementation. The SWCTT method was developed in the 1970s to measure residual oil saturation in the near-wellbore zone after the application of oil enhancement methods. This method is based on the use of partitioning oil-soluble tracer, which forms a secondary non-separable water-soluble traces in the near-wellbore zone due to the hydrolysis process. Evaluation of residual oil saturation is carried out by the time delay in the arrival of the oil and water partitioning tracers.

Results: As a result of the pilot project, experience was gained in implementing SWCTT technology to evaluate the effectiveness of surfactant flooding at a producing oil well in one of the fields of the Khanty-Mansiysk Autonomous Region.

Conclusion: The evaluation and effectiveness of the technology with the selected formulations using simulation and the use of alternative SWCTT/PITT tracer methods has been proven by field tests.

Background: The operation of fields at a late stage of development requires the use of more efficient methods for increasing the TBO of the producing field in order to reduce the high costs of maintenance and repair works of production well stock.

Aim: Analysis of a well operation in a frequently repaired field (FRF), identification of the main causes of failure of downhole pumping equipment (DPE) and a way to solve problems using information technology.

Materials and methods: An important indicator of improving the reliability of the production facilities is the time between overhauls of wells (the TBO). One of the most significant complications during the well operations at the fields is the abrasion of the internal cavity of the tubing by pumping rods (the PR). Abrasion occurs due to mechanical action between the sleeve joint and the body of the rod from the inner wall of the tubing during reciprocating movements.

In order to minimize the contact of the rod with the tubing, a high-quality selection of the rod layout is required with further lowering of the pump rods with a centralizer. The software is an excellent tool for modeling sucker-rod pumping units (SRP), as well as for optimizing layouts of current SRP systems.

Results: According to the well profiles analysis, it is possible to predict failures and the consequences of failures of underground equipment. The efficiency of lowering the layout of underground equipment, calculated in the RodStar software, the number of repairs decreased from 66 to 31 units, and the average operating time increased from 52 to 114 days. It is important to note that failures due to leaky tubing decreased from 25 to 10 units, and the number of parted rods – from 24 to 6 units.

Conclusion: Summing up the analysis of the use of software products for the selection of downhole pumping equipment in the operation of mechanized well stock in oil and gas fields, the relevance and timeliness of creating a corporate database and the use of modern tools should be noted. The effectiveness of the software and the module application are certainly confirmed by the positive results i.e. an increase in TBF and TBO of the production wells of "Zhetybaymunaigaz" PD.

Due to the growing share of hard-to-recover oil reserves, the task of their development becomes more urgent. The development of reservoirs with a complex geological structure is caused by low rates of sampling and values of the oil recovery coefficient. This article discusses the effectiveness of the application of horizontal well drilling technology at field X in order to increase the efficiency of development and coverage of oil deposits. A horizontal well was successfully drilled at the X field, the trunk of which reaches up to 1,000 m. For all the time, 4 horizontal wells have been drilled at the field, with the exception of the one already mentioned, the length of the trunks of other wells vary from 300 to 358 m.

Career competencies refer to the knowledge and skills that are central to the development of a young specialist's future career. They are especially important at the beginning of a career because this choice can affect career outcomes in the long run. The aim of this study is to determine how career competencies change during the transition from education to labor market. Methodology of the study consisted in search and analysis of literature data from authoritative sources included in international scientometric databases. According to the results of the study, it was found that for successful employment career competencies must be developed during training, which guarantees their stability after entering the labor market. Also, based on the literature data, three profiles of changes in career competencies were identified, described in accordance with their initial values and the nature of changes after graduation. Thus, the development of career competencies will increase at the final courses, when students feel a sense of anxiety about the expected entry into the labor market. Career competencies developed at a university after transition to the labor market remain stable, which indicates that a training of future personnel should be carried out in universities.