Dependant on the Investigation method of indoor and area drilling fluid lost control performance, the ideal laboratory experimental circumstances of various loss sorts ended up encouraged, then, the experimental evaluation technique of the drilling fluid lost control performance thinking of different loss kinds was founded. This technique can comprehensively evaluate and quality the lost control skill of your plugging formulation. From the verification in Block K with the Tarim Basin, the examination effects are closer to the sector lost control benefits, along with the analysis effects of the drilling fluid lost control efficiency are far better, which may guide the sector leakage control evaluation.
Exceeding fracture pressure: Inadequate estimation of development power and narrow pore–fracture windows generally produce unintended fracture propagation.
We Beforehand stated that among the main capabilities of drilling fluid is to develop counter-stress towards development tension. This established tension is named hydrostatic pressure. By producing hydrostatic force, it is crucial to control the development tension (at bare minimum) and also the hydraulic fracturing pressure (at most) of your subsurface rocks.
The outcomes display that when The only stress raise is five MPa, the drilling fluid lost control effectiveness is the highest in accordance with the field, and the analysis results of the drilling fluid lost control performance is “good.�?When The only strain increase is one.25 MPa, the drilling fluid lost control efficiency is the bottom in correspondence with the sector, as well as the evaluation result of the drilling fluid lost control efficiency is “poor.
Decide the calculation outcomes of your coincidence diploma among diverse pressure stabilization time along with the on-web page drilling fluid lost control efficiency.
This adjustment is crucial, as it can help manage a fragile pressure equilibrium in the wellbore, represented from the hydrostatic tension equation:
Based on the evaluation approach proposed In this particular paper, the coincidence diploma with the on-web page drilling fluid lost drilling fluid additives control performance exceeds ninety%, and the evaluation result is rated as “Excellent.�?The indoor traditional analysis method, which can be just over eighty% according to the on-site drilling fluid lost control performance, has a score concerning “excellent�?and " basic.
Standard styles for predicting mud loss are minimal by simplified assumptions, linear correlations, and web site-distinct heuristics, which hinder their accuracy and adaptability in elaborate drilling environments. They frequently fail to generalize throughout various geological ailments and they are even more weakened by reliance on compact or synthetic datasets.
Comprehending pore pressures, fracture gradients compared to equivalent circulating densities, and surge pressures While using the mud Houses used in a certain location is vital.
Evaluating the distinctions in instantaneous and steady loss rates at different drilling displacements, the primary difference within the inflow and outflow of drilling fluid monitored on internet site responds within a quick time interval. In the stable loss stage, it can be difficult to discover the distinction between the difference in inflow and outflow, the modify in the overall quantity of drilling fluid, plus the modify in liquid degree height. From Figure 11c, it can be viewed that the slope of the overbalanced strain along with the improve price of standpipe force is small, and the real difference in loss amount for the steady loss phase beneath diverse drilling displacements is tiny, so area drilling usually decreases the drilling displacement to measure the loss level of drilling fluid, though decreasing the consumption of drilling fluid and making sure the accuracy of the measurement from the loss price of drilling fluid.
Lost returns or mud loss is often a partial or finish loss of circulation while in the very well. It’s a common downhole problem in locations like the center East, North Africa, and Latin The us. As an estimate, lost returns account for practically 10% of non-productive time throughout the world.
If the dip angle on the fracture is 0.five, the coincidence diploma on the indoor and field drilling fluid lost control efficiency is higher along with the analysis final result is better
Critical enter parameters like hole sizing, differential stress, mud viscosity, and good material are systematically analyzed, with outlier detection by using the leverage strategy making sure knowledge integrity. Product robustness is reinforced as a result of k-fold cross-validation, even though sensitivity analyses and multiple effectiveness metrics offer further insights into parameter importance and predictive trustworthiness.
JZ comprehensively contributed to your get the job done of the manuscript, such as the style of the analyze, arranged the information, and performed the statistical Examination.