SU905429A1 - Blowout preventer - Google Patents

Description

(54) PREFERENCE

The invention relates to the oil and gas industry and is intended to seal the wellhead of oil and gas wells. The main sealing element of the preventer is the seal. A universal preventer is known, consisting of a body, a lid, a plunger with a seal located therein. The sealant is a conical rubber ring with metallic inserts sprouted into it. The outer surface of the seal is solid. The disadvantage of this preventer is the need to replace the sealant, causing it to be frequently disassembled to clean the soiled cavities of the sealant and preventer. A preventer is also known, which includes a housing with a lid, a plunger and a reinforced seal having radial grooves on the upper and lower outer surfaces and a conical surface interacting with plunger 2. During the drilling process, the flushing fluid fills the space between the pier and the upper part of the plunger. If the drilling process is interrupted (during the drill bit, tool buildup, etc.), the drilling fluid gradually hardens and the process further seals the tool. Before the start of drilling, it is necessary to check the operability of the preventer, which consists in checking the sealing ability of the sealant on the tool for working pressure. This leads to a reduction in the life of the seal. In addition, checking the sealing ability on the tool does not guarantee that the seal will be able to shut off the well if necessary. And it is not recommended to check the sealing ability of the seal without a tool, as the seal life is limited by this indicator. The purpose of the invention is to improve the reliability of the seal by cleaning its surface with mud

The goal is achieved by the fact that on the outer conic (the tops of the compactor are made longitudinal grooves communicating with its radial grooves.

FIG. 1 shows the preventer, general view; in fig. 2 - seal, longitudinal section; in fig. 3 - the same, top view; in fig. 4 - the same cross section.

The preventer housing 1 has a latch 2 and a plunger 3 designed for the transfer of force to the compactor. The plunger 3 contains a seal 4, which seals the tool and overlaps the well if necessary. The seal is reinforced with I-section inserts 5. Grooves 6 for circulation of drilling mud are made on the outer conical surface of the seal between the inserts 5.

The proposed preventer works as follows.

The working fluid from the hydraulic control is fed into the preventer shut-off chamber and moves up the plunger 3, which compresses the seal, seals any part of the drill string and overlaps the entire well if it does not have a tool. When fluid is introduced into the spacer chamber of the preventer, the plunger moves down, the seal expands and takes on its original shape. In the process of sealing the tool, the through grooves on the outer surface of the seal are filled with rubber, ensuring that the preventer is sealed at this point. The annual economic effect of the device

is to eliminate the need for installation work to clean the preventer from contamination, and is 134,244 rubles.

Claims (2)

Invention Formula A preventer comprising a housing with a lid, a plunger and a reinforced seal having on the upper and lower outer surfaces radial grooves and a conical surface interacting with the plunger, characterized in that, in order to improve the reliability of the seal by cleaning its surface with drilling mud, on the outer The conical surface of the seal has longitudinal grooves communicating with its radial grooves. Sources of information taken into account in the examination. Yakovlev, V.A. Hermeticisation of deep boreholes in the drilling process, PTI K., 1965, p. 25-29. 2. Catalog of the company Hydril USA N 1978-79 (prototype). FIG. 7