Conditions for zero value of SIDPP

There are some condition when we don’t have SIDPP (0 or very low value of sidpp) or are unable to see it.
  1. If there is float valve in drill string or casing. Float valve is a NRV (Non return valve) installed in drill string or casing and allows fluid flow in one direction only. In this case there is shut-in pressure but float valve dosent allow it to transmit through itself due to which shut-in drill pipe pressure is not seen at surface. To measure SIDPP in this case, we need to follow a procedure called Float bumping.
    float valve
  2. If drill string or casing is plugged, shut-in drill pipe pressure is not seen at surface. Also as the drill string is plugged it’s not possible to pump drilling fluid through the string. In this case it’s not possible to follow Driller's Method or wait and weight method and we have to go for volumetric method which involves pumping the mud through the annulus using kill line. And the formation pressure and kill mud weight is calculated using shut-in casing pressure (SICP) and hydrostatic pressure on annulus side.
  3. If there is no drill pipe shut-in pressure (DPSIP or SIDPP both are same) which happens when the formation pressure is completely balanced on the drill string side but not on the annulus side. In that case simply circulating Drill string mud through annulus and to surface is going to balance the BHP from annulus side too.
    shut in pressure
In the first two cases we had shut in drill pipe pressure but due to float and plugging that pressure is not felt at surface and the guages will show '0' value. While in third case SIDPP is actually zero.

Kill mud weight

Kill mud is the mud required to kill the well in case the Kick has taken place. To calculate the kill mud weight required, first we need to calculate formation pressure due to which kick has taken place.

kill mud weight

Shut-in Drill pipe pressure SIDPP

Shut-in drill pipe pressure (sidpp) is the surface pressure on drill string side when an influx has taken place and the well is shut. While Shut-in casing pressure SICP is the surface pressure on casing side.

There is a assumption in well-control calculation, When the kick takes place formation fluid flows into annulus and not inside the drill-pipe. Which is genrally true, as the genral direction of fluid flow is from drill pipe to annulus side.

u-tube-effect-drilling

Oil Well kick

Kick is the inflow of formation fluid into the wellbore. Generally drilling is done under overbalance condition which means borehole pressure is higher than formation pressure. This overbalance keeps the formation fluid from entering into the wellbore. But sometimes due to different reasons wellbore pressure may decrease below the formation pressure (under-balance condition), which allows the formation fluid to enter into the hole. This influx is called kick.

Kick can happen during any operation drilling,tripping and circulation. If the kick is handled successfully kick is said to be killed and if the kick flows to the surface uncontrolled its called a blowout.

oil and gas kick

Brent vs WTI crude oil price

Whenever we check for crude oil prices, we notice one thing that Brent crude oil prices are generally higher than WTI crude oil Prices.What is the reason for this Brent WTI price spread?

Brent refers to the oil produced from the North sea and has a sulphur content of 0.37% while WTI is mainly produced in North america and it is delivered at cushing, okhalama(U.S.A) where its prices are set and has a sulphur content of 0.24%. And remember Lower the sulphur content cheaper it is to refine the crude oil. WTI is sweeter than Brent crude that’s why WTI is considered superior to Brent crude, but still is priced lower than Brent crude

Brent vs WTI spread

Oil industry 2020

Meanwhile ,the oil price that had started plummeting in November 2014 has rebounded to 99$/bbl on January 2020.The operations that were shutdown over years -when oil price reached 33 $ ,while Iran flooded the market in Early 2016 ,were resumed in 2017-18 and are operating at full phase now- creating more job prospects & higher demand in 2020.

While the Multinational Service Companies were hit by the low oil prices in 2015-16 resulting in Cost cuttings,at the same time they were taking advantage of the situation & busy planning for swallowing up the companies that could not able to sustain the weakness. The Wave of Mergers and Acquisitions that started in 2014-15 are a bit Freezing now as Industry is Prepared with Restructuring !

oil field ahead

Difference Between Leak off test, Formation integrity test & Formation breakdown test

While Leak off test, Formation integrity test & Formation breakdown test all have the same procedure and aim, the only difference is the point to which the casing shoe will be pressured.

Leak off test