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  • Name: Drilling fluid cooling system
  • Number: 1-31
  • Time: 2019-07-22
  • Views : 1

With the increase of the world's energy demand and the development of drilling technology, geothermal drilling and deep oil and gas drilling have become an important aspect of the development of the drilling industry. Among them, in medium and high temperature geothermal Wells and deep oil and gas Wells (also known as HT /HP drilling), the temperature of the drilling fluid returned to the ground is too high, which not only affects the performance of the drilling fluid, but also burns the drilling platform operators, so it is necessary to conduct timely cooling treatment of the drilling fluid returned to the ground.

 

, on the other hand, in the permafrost gas hydrates drilling and the drilling bit, rock will produce large amounts of heat, drill rod and the wall friction also produce heat, bottom hole temperature, as the growth of the drilling fluid cycle time, lead to return to the surface of the drilling fluid than the permafrost or natural gas hydrate reservoir temperature is high, thus cause the permafrost section (or frozen rock section) bottom hole enlargement or natural gas hydrate decomposition, so drilling fluid temperature must also be timely to cool.

 

Drilling fluid cooling systems are divided into two categories:

 

The high-temperature drilling fluid cooling technology used in medium and high temperature geothermal drilling and deep oil and gas drilling: generally, the geothermal gradient per 100m is 3℃, and the bottom-hole temperature can reach 180-210℃or higher in a well of 6000-7000m. Low temperature drilling fluid cooling technology used in tundra and gas hydrate drilling.

 

Drilling fluid cooling system is divided into two forms:

 

1. Open drilling fluid cooling system: the core is a heat exchanger. The refrigerant carrier is usually fresh or seawater, which is mainly used in areas with sufficient water sources or at sea. The cooling system can only be used in deep Wells, ultra-deep Wells and high temperature and high pressure Wells due to the limitation of the temperature of carrier coolant, but it cannot meet the requirement of drilling fluid temperature in NGH Wells. The principle of open drilling fluid cooling system is shown in figure 1. The system is mainly composed of heat exchanger, refrigerant pump, drilling pump and connecting manifold. Drilling fluid in drilling fluid pool or drilling jar by drilling pump into the plate heat exchanger, as cooling fresh water or seawater by load cooling pump into the plate heat exchanger, drilling fluid and heat exchange cooling agent in the plate heat exchanger, the drilling fluid cooling, heating up of fresh water or seawater after return to pool or the sea, by mixing and heat from the cooling air, also can increase the fan air cooling facilities such as beside the pool, in order to improve the cooling efficiency.

 

2. Closed drilling fluid cooling system: the core is a heat exchanger and a refrigeration unit, and ethylene glycol solution is generally used as a cooling carrier. Since this type of cooling system usually requires the use of ammonia or freon refrigerating units to refrigerate the ethylene glycol solution through a plate heat exchanger, this type of cooling system can also be called the primary and secondary dual heat exchanger cooling system. Because the closed drilling fluid cooling unit has its own refrigeration unit, it is easy to achieve automatic control and is not restricted by the operating environment. It is applicable to a wider range and is also the current development direction.

  Design parameters  
  Design pressure
  Design temperature
  Heat exchange area
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