Industry news

The water-based drilling fluid test of East China Petroleum Bureau was successful

2022-08-25

On April 22, Well Shengye 27-1HF, the first shale gas well constructed with water-based drilling fluid in the East China Petroleum Bureau, was successfully completed, saving more than 25% of the cost compared with the use of oil-based drilling fluid, which is environmentally friendly. The benefits are significant.

 

Mud is known as the "blood" of drilling. During the drilling of shale gas horizontal wells, oil-based mud is generally used for drilling. Oil-based mud is resistant to high temperature and salt and calcium erosion, which is beneficial to wellbore stability, good lubricity, and less damage to oil and gas formations, but the cost is high.

 

In order to solve the problem of high cost of oil-based drilling fluids, Chongqing Shale Gas Co., Ltd. carried out water-based drilling fluid tests in the target layer of the construction area, and jointly tackled key problems with the East China Engineering Chongqing Project Department to continuously optimize the construction plan and water-based drilling fluid system. The researchers use a variety of inhibitors to synergize to ensure the strong inhibitory performance of the drilling fluid, and use the multi-stage plugging agent compound to reduce the water loss of the drilling fluid, improve the plugging effect of the drilling fluid on the shale formation, and adjust the drilling fluid during actual drilling. The density balances the formation pore pressure, realizes the effective stress support for the wellbore, and ensures the success of the Shengye 27-1HF well test.

 

The successful construction of the well shows that the water-based drilling fluid can meet the safety drilling requirements of shale gas horizontal wells in the Nanchuan Work Area. In the next step, Chongqing Shale Gas Co., Ltd. will continue to promote the promotion and application of water-based drilling fluids in the construction area, and promote the efficient and environmentally friendly development of regional atmospheric shale gas.