Application of wax remover

In the process of oil field production, due to the oil well products contain paraffin components, Paraffin is a solid substance in the crude oil, and the paraffin in the oil layer is dissolved in the crude oil. After being mined on the ground, with the decrease of the temperature and pressure of the oil well and the temperature of the wax precipitation point, the paraffin will crystallize out and be deposited on the transportation pipeline system in the form of solid or semi-solid, reducing the transportation efficiency of the gathering and transportation pipeline. It brings resistance to the smooth gathering and transportation of oil flow, and even the phenomenon of wax blocking occurs in serious cases, which brings adverse effects to the production of oil fields.

Petroleum is composed of a variety of components, usually containing wax. Ever since humans have mined oil, they have been dealing with wax all the time. Wax accumulation in tubing is a troublesome problem in petroleum industry. According to incomplete statistics in the late 1980s, the annual cost of removing wax from oil Wells in the United States alone was as high as $6 million. Therefore, wax is also one of the long-term research objects of petroleum scientists and scientists.

Petroleum wax is a solid hydrocarbon, the main component is paraffin, it exists in crude oil, distillate oil and residual oil, has the molecular structure of wax, melting point is higher than 30 ~ 35℃.

Scientists surveyed the world’s proven oil fields and found a very significant phenomenon that highly waxy crude oil is rarely produced in the world’s richest oil-producing regions, such as the Middle East, the Gulf of Maracaibo, Mexico, Texas and other places. The wax content in crude oil is very high in some specific regions of the continents of the earth, including the Tertiary system in some oil regions of China.

The formation characteristics of high wax crude oil production have the following characteristics: almost all are sandy argillaceous rock series; All rock series are formed in low salt or brackish water environment. Most formations contain coal seams, oil shales, or other high carbon deposits; The source beds are mostly formed in lakes, bays and deltas near the land margin. Wax and sulfur are mutually incompatible, that is, only low sulfur crude oil is produced in the formation that produces high wax crude oil, and only low wax crude oil is produced in the formation that produces high sulfur crude oil.

Before the oil field was not developed, the crude oil was buried in the formation, under the high temperature and high pressure conditions of the formation, the crude oil was mostly liquid, and the wax was completely dissolved in the crude oil. In the process of exploitation of the oil layer, when the crude oil flows from the oil layer to the bottom of the well, and then lifts from the bottom of the well along the shaft to the well head, with the pressure and temperature reduced to a certain extent, the wax is separated from the crude oil, and the formed crystalline particles accumulate and increase under certain conditions, and continue to bond on the tubing wall, which is wax formation.

Once the phenomenon of wax formation is found, the optimal treatment technical measures can ensure the smooth progress of oil and gas gathering and transportation in the oilfield. Generally, heat combined with efficient chemical paraffin removal agent is applied to treat the blocked oil well gathering and transportation pipeline. The technology of chemical paraffin removal and thermal paraffin removal is combined. Through the action of heat, the transport temperature of the pipeline is increased, and the paraffin is dissolved. Restore the normal operation of oil and gas gathering and transportation pipeline to ensure the best efficiency of oil and gas gathering and transportation.

The method of adding chemical additives is not only suitable for the removal of wax in the well shaft, but also for the removal of wax in the surface oil pipeline system.
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