Water injection well profile control technology of using clean carrying fluid to prepare oil containing sludge plugging agent

Abstract

The invention relates to a water injection well profile control technology of using a clean carrying fluid to prepare an oil containing sludge plugging agent. The technology comprises following steps:(1) taking oil containing sludge as a main agent of the oil containing sludge plugging agent, and saving oil containing sludge for later use; (2) preparing a clean carrying fluid, and taking the clean carrying fluid as a suspension agent of the oil containing sludge; (3) mixing the oil containing sludge with the clean carrying fluid, wherein the oil containing sludge accounts for 5 to 25 wt.% ofthe plugging agent, and the balance being the clean carrying fluid, stirring the mixture by a stirring facility, and storing the mixture for at least 30 days to form stable oil containing sludge suspension, namely the oil containing sludge plugging agent; (4) according to the technical requirements of water injection well profile control, diluting prepared oil containing sludge plugging agent by water to obtain a plugging agent that meets the technical requirements, and injecting the obtained plugging agent into a water injection well by a pump facility; and (5) after pumping, closing the wellfor 3 to 5 days, then connecting a water injection pipeline to the well, and carrying out water injection. The provided technology is environmentally friendly.

Description

technical field [0001] The invention relates to a water plugging and profile control operation used in the exploitation of oil and gas fields, in particular to a water injection well profile control process for preparing an oily sludge plugging agent with a clean carrier fluid. It belongs to the field of oil exploitation. Background technique [0002] Oily sludge is a mixture of inorganic and organic matter. It has a complex composition, but its chemical properties are relatively stable. Its appearance is black or brown-black according to different oil reservoirs. It is viscous and semi-solid after long-term storage. It is mainly composed of emulsified crude oil, water and solid particles. It is mainly produced in the links of crude oil treatment, station and warehouse gathering and transportation system, drilling, downhole operation, etc. It is one of the main pollution sources in the oilfield development process. [0003] At present, oily sludge can be pumped into oily re...

AI Technical Summary

Problems solved by technology

[0003] At present, oily sludge can be pumped into oily reservoirs in the form of reinjection. The most effective method is oily sludge profile control technology. Conventional oily sludge profile control can solve the problem of waste reuse of oily sludge, but With the development of technology, the conventional oily sludge profile control agent needs to add sludge flotation agent, sludge dispersant and crosslinking agent. The configuration is complicated, and additives need to be added one by one. Each one needs to be evenly mixed before adding the next additive. Moreover, the conventional oily sludge profile control agent simply plugs the reservoir and cannot improve the water injection efficiency. These factors restrict the promotion of oily sludge profile control technology