Shale oil horizontal well high-pressure drainage system and method

By installing wellhead casing gate valves, drainage devices, and pressure transmitters in shale oil horizontal wells, the drainage pressure and fluid volume are monitored in real time. The nozzle specifications are adjusted, and production nozzles with erosion-resistant alloy coatings are installed inside the nozzle valves. This solves the problems of nozzle erosion, loosening, and disengagement, and improves the safety and efficiency of the drainage system.

CN121952518APending Publication Date: 2026-05-01PETROCHINA CO LTD
1 Cites 0 Cited by

Patent Information

Application Number
CN202411537076.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-31
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

In existing technologies, shale oil horizontal wells face several problems during the drainage process, including the erosion of nozzles caused by the discharge of fluid and sand, requiring frequent replacement; loosening and disengagement of nozzle threads; difficulty in cleaning clogged nozzles; and well control and environmental risks.

Method used

The shale oil horizontal well high-pressure drainage system includes a wellhead casing gate valve, drainage device, control system and pressure transmitter. By monitoring the drainage pressure and fluid volume in real time, the specifications of the production nozzle are adjusted, and a production nozzle with an erosion-resistant alloy coating is installed inside the nozzle valve. It is designed to be installed in the flow direction, and a control valve is provided at the rear end of the nozzle valve.

Benefits of technology

It improved on-site work efficiency and safety, solved the problems of erosion, loosening and disengagement of oil nozzles, ensured well control and environmental protection requirements, and simplified the cleaning and replacement process.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention belongs to the technical field of petroleum yield increasing transformation, and particularly relates to a shale oil horizontal well high-pressure drainage system and method. The drainage and mining system comprises a wellhead casing gate valve, a drainage and mining device, a control system and a pressure transmitter, the drainage and mining device comprises a four-way joint, an oil nozzle valve and a parallel gate valve which are communicated in sequence, the four-way joint is communicated with the wellhead casing gate valve, and a production oil nozzle is installed in the oil nozzle valve. The pressure transmitter is installed to monitor the discharge and production pressure in real time, so that the production oil nozzle with the proper specification is adjusted and installed according to the wellhead pressure and the liquid amount. The production oil nozzle is mounted in the oil nozzle valve, so that sufficient mounting positions can be provided for the production oil nozzle, the production oil nozzle is mounted along the flow direction of production oil, and the oil nozzle can be firmer when subjected to impact and rotating force of the oil flow during normal production; the problems of loosening and tripping of oil nozzle threads caused by rotating force generated by high-pressure fluid are solved.
Need to check novelty before this filing date? Find Prior Art