STUDY OF SELF-DRYING EFFECT OF PACKER INSTALLATIONS IN EXPLOITATION WELLS
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- Опубликовано: 12.02.2023 18:09
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Volume 13 (1), February 2023, Pages 57-64
Zenfira Huseynli1, Hamid Popal2
The article considers the effect of self-compacting of packer structures in production wells. In order to reduce the high costs of oil and gas companies, the issues of self-compacting packers in producing production wells are being studied. The design used here is centered in the open hole, and the rubber elements of the packers prevent leakage in the event of a pressure drop.
In general, the sealing assembly consists of a sealing surface, sealing elements, an auxiliary protective structure and a power mechanism. Under downhole conditions, the operating pipeline is not part of the seal assembly and varies from well to well. For this reason, the principle of operation of the packer's sealing unit cannot be justified from the point of view of the roughness of the sealing surface and the specified limits on the nature of the gas-liquid medium to be separated. This indicates that the operating conditions of the well packer are significantly different from the operating conditions of other sealing structures.
Despite the effectiveness of the use of packers, the low manufacturability of the sealing elements does not allow them to be widely used. Most often, this manifests itself in special difficult conditions, at the same time, in operating conditions, when the sealing material is broken, the rubber material flows onto the metal part of the packer, the rubber sticks to the wall of the production string, in some cases, tubing is captured. The performance of packer equipment is determined by the performance of its sealing elements. Since the sealing elements are mainly rubber-like construction materials, their design is unreliable in mountain conditions.
The packer is released into the well by tubing. When the required depth is reached, water is pumped into the packer barrel (through the NCU). In this case, the valve is connected to the fluid pressure in the packer hydraulic cylinder, and the piston moves, compresses the rubber cuffs through the support washer and delivers them to the inner surface of the working belt. He pushes the cone under the plates and thus shrinks the packer.
To drive the lower layer into the packer, the pressure is increased by an additional 3.5 MPa (23 ... 25 MPa from the landing pressure) and the mortise screws are cut off, the ball and seat are released from the packer. The packer channel opens. At this time, under the pressure of the well product (oil or gas), the round plates in the anchor are pressed against the belt, which prevents the packer from slipping upwards. To release the packer from the well, just pull it up. The packer consists of the mechanisms of the upper and lower devices, the clamping collar assembly, the saddle valve, the hydraulic cylinder, the circulation valve.
Relevance. The study of the shaping units of packer structures and the choice of criteria that provide the shaping effect is a topical issue.
Keywords: conditioning elements, wellbore, packer assembly, horizontal well, open hole staged fracturing.