# Practical work on discipline: Overhaul

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Practical work No. 1
"Choosing the density of the well killing fluid during well workover"
Purpose of the lesson: To learn how to determine the required density of the well killing fluid when repairing a well under the given geological and technical conditions.

Task No. 1: Calculate the required density of the well killing fluid during well workover under the given geological and technical conditions. The initial data for the calculation are presented in Table 4.3.
Table 4.3
Initial data for calculation
Rpl, MPa 28
N, m 2810
P 0.05
Practical work number 2
"The choice of a lifting unit for carrying out
repair and restoration work "

Purpose of the lesson: To learn how to choose a mobile lifting unit

Task number 2: Select a mobile lifting unit using the data of task number 1, as well as the initial data for calculating table 4.3.

Table 4.3
Initial data for calculation
Ø e / c, mm 114
Δe / k, mm 7
Ø tubing, mm 60
δnkt, mm 5
Practical work number 3
"Determination of the length of the unsecured part of the technological column"

Purpose of the lesson: To learn how to determine the length of the unsecured tubing string.

Problem 3: Drill pipes stuck in a well with a 4 × 5 tackle system. According to the GIV-2 readings, the weight of the drill pipe string in suspension before the stuck was equal to Q (Table 4.4) divisions. The resulting extension of the drill string was l (Table 4.4)
Determine the length of the unstuck drill string. Use the initial data for the calculation from previous tasks, as well as table 4.4.
Table 4.4
Initial data for calculation
Q, div. thirty
l, cm 35
Practical work number 4
"Determination of the permissible tensile load on the fishing tool in the wells"

The purpose of the lesson: To learn how to determine the permissible tensile loads on the fishing tool, as well as the necessary efforts when walking the tubing. "

Task: Determine the maximum permissible load on the spear during fishing operations, the permissible tension force when moving the stuck drill pipe string with a diameter of 89 mm. The initial data for the calculation are presented in Table 4.6.
Table 4.6
Initial data for calculation
t, MPa 380