Design changes of injection and supply wellhead fittings operating in winter conditions

Abstract

The article deals with design changes in the existing injection well fittings. Disadvantages of the existing fittings are stagnant zones, considerable height and dimensions which cause problems of thermal insulation leading to rapid freezing of wellhead equipment in winter. At low temperatures, supply lines freeze and fail. The design of small-sized fittings of injection wells was developed. Elastic rubber cords, which absorb pressure caused by ice expansion due to water freezing and prevent rupture of the supply lines, are recommended to use.

Investigating formation resistance to fracture during operation of wells prone to plugging

“…It is known that in an elastic hollow ball, when a liquid is filtered to its center with a decrease in pressure in its cavity, the stresses in the wall of the ball over the entire section are unambiguous, specifically, negative (compression stresses), and in the ratio In this regard, the following condition of material yield is valid for the plasticity zone: (9) A plus sign in front of in equation ( 9) is taken from the solution [7], since the difference , when the material passes from the elastic state to the plastic flow state, it will obviously not change.…”

“…The resulting dependence (20) can be considered as a criterion equation. Using this relationship, it is possible to determine the permissible oil production rate or the pressure drop across the formation, which ensures the normal operation of the well and the stability of the formation material behind the casing [9]. To determine the permissible values of the flow rate or pressure drop, we will use a well-known parameter, specifically, the safety factor z.…”

Development and Trends in Wellhead Equipment Detection Technology

“…In the fire and explosion prevention technology of oilfield gas wells, the development history and trends of wellhead equipment detection technology are important research directions. Abroad, significant progress has been made in this field, primarily manifested in the following aspects [17].…”

Technical and technological justification of repair and insulation works at oil fields of the Republic of Tatarstan using special compositions

“…It is known that the efficiency of oil field development is largely defined by the state of production and injection well stock, which determines the continuity of their operation and high technical and economic indicators [1][2][3][4][5].…”