Insulation pipes for heavy oil well hot water closed circulation heating viscosity reducing equipment

Abstract

The invention discloses insulation pipes for heavy oil well hot water closed circulation heating viscosity reducing equipment, and relates to the field of oil field oil extracting devices. The insulation pipes includes upper connectors, a pipe body assembly, and lower connectors, and during using, when the any two adjacent insulation pipes for the heavy oil well hot water closed circulation heating viscosity reducing equipment are used, the upper connector of one of the insulation pipes for the heavy oil well hot water closed circulation heating viscosity reducing equipment is connected with the lower connector of the other insulation pipe for the heavy oil well hot water closed circulation heating viscosity reducing equipment in a threaded mode. Through the arrangement, the insulation pipes for the heavy oil well hot water closed circulation heating viscosity reducing equipment can be maintained and changed, the cost is low, the loss is small, damage is not prone to happening during well descending, clamping grooves are formed in the upper connectors, a hoisting tool is used for clamping the clamping grooves, and the equipment can be descended into the oil well, according to the insulation pipes for the heavy oil well hot water closed circulation heating viscosity reducing equipment, a special well descending device is not needed, operation can be realized by normal workers, the using cost is low, and well descending is convenient.

Description

technical field [0001] The invention relates to the field of oil production equipment for oilfields, in particular to a thermal insulation pipe for a closed-type hot water circulation heating viscosity reduction device for heavy oil wells. Background technique [0002] The oil field adopts heating viscosity reduction technology when exploiting crude oil in dense wells. There are many existing heating viscosity reduction technologies. One of the technologies is to use a hollow rod as the connecting rod between the pump piston and the pumping unit. The outer surface of the hollow rod is The diameter is generally Φ42, the inner diameter is Φ31, and then a coiled tube with an outer diameter of Φ25 is lowered into the hollow rod. The length of the coiled tube is hundreds of meters to several thousand meters. It returns through the annular channel between the coiled tube and the hollow rod, and transfers heat to the thick oil outside the hollow rod, making it heated to reduce visc...

AI Technical Summary

Problems solved by technology

Since the coiled tubing is hundreds to thousands of meters long, hot water (or steam) begins to transfer heat at the upper part of the coiled tubing, and the temperature has dropped a lot when it reaches the lower part of the coiled tubing. Therefore, the current technology for heating heavy oil is only It can heat the heavy oil in the upper part of the pipe string, but the heating effect is not good, which affects the production of heavy oil wells

[0003] For this reason, technicians have developed a closed circulation heating viscosity reduction device for heavy oil wells with application number CN2016107220694, which effectively solves the problem of poor heating effect of the existing heating viscosity reduction technology

However, the coiled tubing in this device is a thermal insulation pipe with a length of about 1000m, which belongs to small-diameter thin-walled coiled tubing, and requires special equipment when going downhole (such as the application number is 2018106096966, and the name is "small-diameter thin-walled coiled tubing injection device") The settings recorded in the Chinese patent) and the operation of trained technicians can be safely lowered into the well, which is difficult to implement and high in use costs, and because the small-diameter thin-wall coiled tubing is too slender, it is very easy to damage during the downhole process , once one part is damaged, the whole coiled pipe will be scrapped and the loss will be huge

Images