Research on the Retention Model of Drilling Fluid in Eccentric Annulus
Sinopec Jianghan Petroleum Engineering Company, Wuhan 430000, China
| Abstract: | During the cementing process, cement slurry is used to replace drilling fluid, gradually filling the entire annular space gap. At the same time, the displacement interface obtained through cement injection can intuitively reflect the displacement effect. The displacement process starts from near the center of the annular space gap and spreads to both sides. The longer the displacement interface, the insufficient displacement power will cause the phenomenon of liquid mixing and interface stop expanding, resulting in retention and delayed flow, forming a drilling fluid retention layer, It has a significant impact on the later injection and production process, so we need to improve displacement efficiency, prevent retention, and improve the efficiency of oil production. In previous research articles, most scholars mainly used flat plate flow as the research carrier to calculate and study the drilling fluid flow, local retention, and retention layer thickness in the eccentric annulus. In this paper, based on the motion equation in the cylindrical coordinate system, the retention of drilling fluid in the eccentric annulus was analyzed and studied, and a new integral constant was introduced, Establish the velocity distribution function of cement slurry or displacement fluid at the displacement interface, use iterative operation to calculate the local retention boundary, control errors, and more accurately calculate the position of the retention boundary, the thickness of the retention layer, and the influence of different factors on the thickness of the retention layer. This lays the foundation for subsequent research on the mixing relationship between pure mechanical models and fluids. |
| Keywords: | Eccentric Annulus; Replacement Interface; Local Retention |
| DOI: | 10.57237/j.jest.2024.01.001 |
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Received: 14 December 2023
Accepted: 26 January 2024
Published Online: 4 February 2024
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