Device and method for pretreating LNG (liquefied natural gas) for well flushing wax removal vehicle

Abstract

The invention relates to a device and a method for pretreating LNG (liquefied natural gas) for a well flushing wax removal vehicle. The device comprises a vehicle body and a tank. The tank is arranged on chassis of the vehicle body; a plurality of connected LNG tanks, a tail gas collecting device, vaporization heating systems, a combustion system, a control system and an LNG recycling system are arranged in the tank; the LNG tanks are connected with the vaporization heating systems by primary pressure reducing valves; the vaporization heating systems are connected with the combustion system; the tail gas collecting device is used for collecting tail gas of the vehicle body and is connected with the vaporization heating systems; the tail gas collecting device comprises a motor, a frequency converter and a gas pump; the control system comprises an operation display panel, a control module, a temperature sensor, a pressure sensor, a liquid level sensor and an alarm device. The device and the method have the advantages that the device is reasonable in structural design, a tail gas system can be sufficiently utilized, heat released by the tail gas system can be used for heating LNG fuel, accordingly, the LNG fuel can be assuredly completely vaporized, the device is low in production cost, and the manual labor intensity can be greatly relieved.

Description

Technical field [0001] The invention relates to the technical field of a well washing and wax removal vehicle used in oil extraction operations in the petroleum industry, and in particular to a well washing and wax removal vehicle LNG pretreatment device and a processing method thereof. Background technique [0002] In the process of crude oil extraction, with the continuous increase of oil wells, increasing workload, changes in oil quality and aging of equipment, wax deposition has become more and more serious, hindering the flow of crude oil and affecting the oil production rate of oil wells; The demand for wax equipment is also increasing, and the cost is also increasing, and the existing well washing and wax removal equipment of oil wells is increasingly unable to meet the needs of crude oil production. [0003] The traditional method of well washing and wax removal is to inject a large amount of hot water into the well. However, with this method, on the one hand, the temperatu...

AI Technical Summary

Problems solved by technology

[0002] In the process of crude oil extraction, with the continuous increase of oil wells, the continuous increase of workload, the change of oil quality and the aging of equipment, wax deposition is becoming more and more serious, hindering the flow of crude oil and affecting the oil yield of oil wells; The demand for wax equipment is also increasing, and the cost is also increasing, and the existing well washing and wax removal equipment of oil wells are increasingly unable to meet the needs of crude oil production

[0003] The traditional method of flushing and removing wax is to inject a large amount of hot water into the well. However, with this method, on the one hand, the temperature of the hot water is low, the heating time is long, and the cost is high. On the other hand, it not only causes environmental pollution, but also the oil well is almost Normal production cannot be done within a day, and the pumping unit is doing useless work

Some of the existing well washing and wax removal vehicles in China use fuel oil as the combustion medium, which has the following disadvantages: preheating time, large consumption, high cost, black smoke generated during combustion, which pollutes the environment, etc.

Therefore, there is an urgent need for a clean and environmentally friendly well washing and wax removal vehicle. The LNG well washing and wax removal vehicle has a short warm-up time, less consumption, low cost, and does not produce black smoke when burning, which is very environmentally friendly and can realize automatic control of the temperature in the boiler system. Constant adjustment to ensure the safe and automatic operation of the system, but LNG fuel needs to be vaporized and then burned, but the engine water cannot provide enough heat for vaporization, so LNG needs to be pretreated to make it vaporize successfully

At the same time, the operation is still manual operation, and the over-temperature, over-pressure, oil shortage, water shortage and other states in the operation process all rely on manual observation and judgment, which has defects such as high labor intensity and potential safety hazards.

Images