Using Combined Load Chart For Stuck Pipe Situation

By DrillingFormulas.Com | June 20, 2015 - 6:00 am |June 20, 2015 Drill String, Stuck Pipe

When the drill string get stuck, there are several ways to free the string as using Jar (up and/or down), straight pull, working torque down, etc. Pulling stuck pipe with torque in the drill string is one of those technique which often utilize to free the stuck drill string. However, there are some concerns that you should know before doing this because torque in the string will reduce a tensile capacity of tubular. This is very important to read and understand the combined load chart (Torque‐Tension Graph) in order to determine the limitation before pulling the pipe.

combined-load-chart-for-stuck-pipe

For this example, we use 5” DP, S-135, NC50 (4-1/2” IF connection) to be a reference figure.

Pipe information

Pipe Size and Weight: 5.000″ 19.50ppf 0.362″ wall IEU
Pipe Grade: S-135
Range: 2
Tool Joint: 6.625″ X 3.250″ NC50
Tool Joint 120,000 psi Material Yield Strength
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Determine Stuck Pipe Depth Based on Real Example

By DrillingFormulas.Com | June 13, 2015 - 3:39 pm |January 14, 2021 Stuck Pipe

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This is the real example of how to determine stuck depth using the stuck depth calculation.

Well Information:

TD = 8,900’MD/5,600’ TVD
Bit Size = 8.5”
Drilling fluid = water based mud (PHPA system)
Formation: sand shale sequence
BHA: 7” mud motor + 9 stands of 5” HWDP S-135, 4-1/2” IF connection
Drillstring: 5” DP S135, 4-1/2” IF connection
Neutral weight @ 6,850’MD = 175 Klb

While tripping out of hole to 6,850’MD, observe over pull 40 Klb over pick up weight. Stop tripping out and attempt to go down no issue. Attempt to rotate, pipe is able to rotate at 30K ft-lb. Attempt to circulate, observe restricted flow.

Figure 1 - Stuck While Pulling Out

Figure 1 – Stuck While Pulling Out Continue reading →

How To Free Stuck Pipe (Oilfield)

By DrillingFormulas.Com | March 5, 2014 - 8:12 am |March 30, 2014 Stuck Pipe

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This article is a summary of how to free stuck pipe caused by three main mechanisms which are wellbore geometry, differential sticking and packing/bridging off. It will give you some ideas which you can apply for your operation.

How-to-free-a-stuck-pipe2

Free Stuck Pipe Caused By Wellbore Geometry

These following instructions are guide lines on how to free the stuck drill string caused by wellbore geometry.

What should you do to free the stuck pipe caused by wellbore geometry ?

• If the drill string gets stuck while moving up, jar down with maximum trip load and torque can be applied into drill string while jarring down. Be caution while applying torque, do not exceed make up torque.

• On the other hand, if the drill string gets stuck while moving down, jar up with maximum trip load. DO NOT apply torque in the drill string while jarring up.

• Flow rate must be reduced while attempting to free the drill string. Do not use high flow rate because it will make the stuck situation became worse and you will not be able to free the pipe forever.

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