Mechanical control pipe column for continuous agent adding of intubation production well

Abstract

The invention relates to a mechanical control pipe column for continuous agent adding of an intubation production well in the technical field of production in oil and gas fields. The pipe column comprises an intubation bridge plug assembly arranged in a downhole sleeve. An agent adding pipe column body is arranged in a production channel of the intubation bridge plug assembly and sequentially comprises an agent dissolving section and a plurality of sealed agent storage sections from bottom to top. Solid agents are packaged in the agent dissolving section and the sealed agent storage sections correspondingly. A water-permeable hole is formed in the agent dissolving section of the agent adding pipe column body. Dissoluble sealed partition plates are arranged between the agent dissolving section and the sealed agent storage section on the lowest side and between every two adjacent sealed agent storage sections. A sealed weight adding plug for sealing the topmost sealed agent storage section is arranged on the top of the agent adding pipe column body. A plurality of seal rings are arranged between the sealed weight adding plug and the agent adding pipe column body. By means of the pipecolumn for continuous agent adding, solid agents can be dissolved and released upwards from the lower side section by section, the dissolving process is not influenced by an upper side pipe column deposition sand layer, the agents are limited in an agent dissolving sieve pipe on the lower layer, and it is avoided that the agents are too rapidly dissolved and suspended agent blocks block an oil production channel.

Description

technical field [0001] The invention relates to an intubation oil well mechanically controlled continuous dosing string used for downhole anticorrosion and antiscale in the technical field of oil and gas field exploitation. Background technique [0002] At present, many domestic oil fields have entered the middle and late stages of development. With the rise of comprehensive water cut, wellbore scaling and corrosion are serious, seriously affecting the normal production of oil fields. Many oil wells need to add chemical agents such as wax remover, scale inhibitor and corrosion inhibitor to carry out wellbore anti-corrosion and anti-scaling treatment. [0003] As many domestic oil fields have entered the middle and late stages of development, there are more and more casing damaged wells. For the oil wells that are sealed and produced, the most widely used oil wells are the oil wells that have broken casings or multiple water outlets. technology. This technology uses bridge ...

AI Technical Summary

Problems solved by technology

There are problems with this method: first, it is difficult to control the dissolution temperature of different blocks, and all the chemicals in the pipe string participate in the dissolution at the same time. When the well temperature is high and the dissolution is fast, all the solidified chemicals can be dissolved in one month, which cannot meet the needs of on-site oil well addition. Continuous requirements; second, after the curing chemical agent dissolves in the tail pipe, when the dissolution is fast, it is easy to form a block structure, blocking the oil flow channel, resulting in the oil well not being able to produce normally; third, this method of adding chemicals can only be implemented in conjunction with minor repair operations

[0005] Downhole intelligent drip dosing technology can set the dosing process according to the program, but the battery life is short, the length of the drug storage tube is limited by the principle of intelligent dosing and the distance between the pump and the bottom of the well, it cannot achieve continuous dosing for several years, and it is expensive , this technique is not suitable for intubated production wells

And this technology can only be connected under the bridge plug. The bridge plug is usually set and sealed in the well for 5-6 years, and it is not taken out, and even some wells are taken out after more than 10 years. It is impossible to replenish the medicine, and it is a one-time use.

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