Role of hydroxyethyl in field well workover

The low solid phase well completion liquid matched with HEC can prevent. The soil particles from blocking the oil layer gap when approaching the oil layer. The water loss nature will also prevent a large amount of water from the mud into the oil layer to ensure the production capacity of the oil layer. HEC reduces the drag of the mud, which reduces the pump pressure and reduces the power consumption. Its excellent salt dissolution performance also ensures that there is no precipitation in the oil well acidification treatment.

  1. In well completion and workover operations, the viscosity of HEC is mainly used to transfer the gravel. Adding 0.5-1kg of HEC to each barrel of working fluid can carry the rock sand and gravel from the well eye. Making the radial and longitudinal gravel status better. Next, it is also very convenient to remove the polymer. Which greatly simplifies the process of removing the workover fluid and the completion fluid. As long as occasionally, the underground conditions are special. It is necessary to take. In this case, a water-loss relief solution equipped with a high concentration of HEC can be trie out by quickly adding a HEC of 1.3-3.2kg into each barrel of water.
  2. In addition, in extreme cases. About 23 kg of HEC can be place in each barrel of diesel oil under the main pump to slowly hydrate when mixed with rock water in the hole. In a sand core saturated with a permeability of 500 mmsi and a solution at a concentration of about 0. 68 kg of HEC per barrel, the permeability is restored to more than 90 percent. In addition, an HEC completion solution containing calcium carbonate, made of unfiltered seawater containing 136ppm solid-phase adult components. Restores 98% of the original repermeability.
  3. The solid-phase workover fluid made by HEC has achieve significant results in sand prevention workover. Acidification, well test, steam handling and well pressing. They believe that the workover fluid is clean. Does not contact with the oil layer to cause clay expansion and migration, has very little permeability damage to the core
  4. In cement cementing process, HEC has dual functions: it can reduce the pump pressure by reducing hydraulic friction, improve the rate. And more importantly, HEC has excellent water loss effect. Which can effectively prevent water flow to rock layers, causing cementing, and protect the mechanical properties of cement. The HEC used in Daqing Oilfield and Shengli Oilfield in China has successfully completed the cementing operation of deep Wells above 4000-5000 meters. Low-adhesive HEC is generally used in cementing processes.

HEC can stably coexist very well with the commonly used oilfield chemical additives such as insecticide. Deaerator, mud water loss control agent and defelosion agent.

HEC

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