Abstract
The paper considers the features of the underground storages (US) construction in depleted oil and gas condensate fields (DOGCFs). The requirements for the structure of the formation, corresponding to the parameters of the object for possible US creation are presented.
 The influence of geological, hydrogeological, mining and technical rock formation conditions on the reliability and tightness of underground storages, including underground gas storages, has been evaluated. The necessary conditions for the US design are analyzed at the example of the Ach-Su oil and gas condensate field, in the presence of a well-explored trap with acceptable parameters for the construction of an underground storage. An important aspect is the geological conditions that meet the criteria for selecting the object: the required structure, the absence of fracturing faults, high reservoir properties of the formation, a sufficient volume of the deposit for the storage. Geological conditions lay the basis for determining the individual characteristics of the US construction technology at each DOGCF. The refined results for the current gas-saturated pore volume and the rate of pressure drop in the formation are presented, which makes it possible to select improved technological indicators in the course of operation of the created US. In order to select the optimal option for the design and construction of the US, the results of economic and geological scenarios analysis were studied concurrently with the capabilities of the technological operation of the object and transport system, which can ensure the maximum daily production of the storage.
Highlights
The peculiarity of creating underground storages (US) is that the pore space in the formation of a depleted oil and gas condensate field (DOGCF) is used as a tanker for storing the injected product
As a result of well testing, it was found that the water content of the Upper Cretaceous sediments largely depends on the reservoir properties of the rocks
The largest inflows of water were obtained in wells that opened the Upper Cretaceous sediments in the crest of the structure; much smaller inflows were obtained in the wells located at its immersion
Summary
The peculiarity of creating underground storages (US) is that the pore space in the formation of a depleted oil and gas condensate field (DOGCF) is used as a tanker for storing the injected product This formation must have a considerable capacity and be economical and safe for the environment at a sufficiently high pressure level. In this regard, it is necessary to study the productive formation with an appropriate geological structure (usually domed), capable of storing the injected product, as well as a sealed cap in the created facility [10]. A prerequisite for the design of an object is the presence of a well-studied trap with acceptable parameters for the construction of US [3]
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