High-temperature salt well directional well butt joint navigation conveying system and application method

Abstract

The invention belongs to the technical field of high-temperature salt well directional well butt joint, and particularly relates to a high-temperature salt well directional well butt joint navigationconveying system and an application method. The high-temperature salt well directional well butt joint navigation conveying system comprises a directional well, a drilling machine, a drill stem column, a non-magnetic drill collar, a navigation conveying device, a high-temperature salt well dissolving cavity, a magnetic guiding butt-joint instrument, a cable and a winch, wherein the drilling machine is installed at a well mouth of the directional well, the drill stem column is arranged in the directional well, the upper end of the drill stem column is connected with the drilling machine, the non-magnetic drill collar at the lower end of the drill stem column is connected with the navigation conveying device; and the navigation conveying device is placed in the center of the high-temperaturesalt well dissolving cavity. The invention provides the high-temperature salt well directional well butt joint navigation conveying system and the application method in order to enable the magnetic guiding butt-joint instrument to be safely lowered into and pulled out of the high-temperature salt well dissolving cavity to improve the construction safety and stability and enable the butt-joint instrument to be located in the center of the high-temperature salt well dissolving cavity to ensure the accuracy of butt-joint signal receiving.

Description

technical field [0001] The invention belongs to the technical field of high-temperature salt well directional well docking, and in particular relates to a high-temperature salt well directional well docking navigation delivery system and an application method. Background technique [0002] With the development of my country's chemical industry, the demand for chemical raw materials such as polyvinyl chloride, caustic soda, and hydrochloric acid has increased significantly, prompting the vigorous development of salt mine development. At present, salt mining mainly adopts the method of water dissolution, that is, "horizontal well + vertical well". After the connection between the horizontal well and the vertical well is completed, saturated brine is injected from the horizontal well, and brine is extracted from the vertical well. This requires two sites, which causes costs. Large, large land occupation, inconvenient management, etc., are also limited by objective reasons such ...

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Problems solved by technology

[0004] 1. The weight of the instrument is small, and it is easy to be blocked in the inclined well section, and cannot reach the predetermined dissolution cavity; 2. The directional well creates caves through water dissolution, forming irregular dissolution cavities in the salt layer, and there are often small salts on the top of the target salt layer Caves will also be formed when water dissolves to create caves; there are often non-saline interlayers in the target salt layer. When water dissolves to create caves, these interlayers cannot be dissolved and form suspended layers. The connecting probe will go down to these places by its own weight. 3. The directional well has a certain slope. Even if the connected instrument can enter the target dissolution cavity smoothly, the instrument is in a suspended state due to the influence of gravity in the dissolution cavity, and is at the bottom of the dissolution cavity. Deviation; when the instrument is ready to be pulled out, it will also be stuck, causing the instrument to fall into the well; 4. The target layer of high-temperature salt wells is often relatively deep, prone to crystallization or solid accumulation, and the pump cannot be turned on when it is difficult to connect the instrument or encounter obstruction; 5. The instrument is in the dissolution cavity, if the salt layer collapses, it is easy to bury the docking instrument in the dissolution cavity and cause an accident

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