Integrated test method for filtration loss and displacement efficiency of horizontal well

Abstract

The invention relates to a horizontal well filtration and displacement efficiency integrated test method. The method comprises the following steps: mounting a column rock and ring rock displacement holder on a vertical section of a simulation test cylinder; respectively mounting the plurality of annular cores and the plurality of columnar cores on corresponding filtration holders for filtration tests; one annular rock core is selected for filtration performance analysis, and the other annular rock core is installed in an annular rock displacement holder; one columnar core is selected for filtration performance analysis, and the other columnar core is installed in a columnar displacement holder; starting the slurry pump, pumping out the test liquid by the slurry pump, feeding the test liquid into a lower end inlet of the simulation test cylinder, sequentially flowing through the column rock displacement holder and the ring rock displacement holder, and discharging the test liquid from an upper end outlet of the simulation test cylinder; when the filtrate amount of the ring rock displacement holder reaches a set value, the slurry pump is stopped; and taking out the annular and columnar rock cores, and analyzing the displacement efficiency. According to the testing method, the annulus filtration and scouring environment of the underground casing can be truly simulated, and the testing result is more real and reliable.

Description

technical field [0001] The invention relates to the technical field of tools for drilling, completion and cementing engineering of oil and natural gas wells, in particular to an integrated testing method for filtering loss and displacement efficiency of horizontal wells. Background technique [0002] Drilling fluids are used as working fluids in the drilling process. Drilling fluids are divided into oil-based drilling fluids and water-based drilling fluids. The drilling fluid circulation plays the role of cooling the drill bit, cleaning the bottom of the hole, taking out the cuttings, lubricating the drilling tool, protecting the wall of the hole to prevent collapse, balancing the formation pressure, and transmitting the power needed to break the rock at the bottom of the hole for the power machine at the bottom of the hole. The water in the drilling fluid enters the formation from the hole in the well wall, which is called water loss. At the same time of water loss, the cla...

AI Technical Summary

Problems solved by technology

The operation process is relatively complicated and cumbersome. At the same time, the holder uses special tools to take out the filter loss core and at the same time it will damage the mud cake on the surface of the core. If the operation is not done properly, the mud cake will fall off, resulting in the failure of the entire filter loss process.

[0008] The traditional surrounding rock fluid loss holder is only suitable for conventional core displacement experiments, and cannot simulate the real fluid loss state during drilling

The conventional method is to take out the annular core column after filtration from the holder, and then place it on the weighing platform for measurement. Only by weighing can the fluid loss be fed back and judge whether the thickness of the mud cake reaches the predetermined value. If it does not reach the predetermined value Then the holder needs to be reassembled and the filter loss test is carried out again. Repeated disassembly and assembly of the holder increases the workload, reduces the work efficiency, and easily damages the filter cake

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