# Boyle’s Gas Law and Its Application in Drilling

Understand Boyle’s Gas Law

Boyle’s law states that at constant temperature, the absolute pressure and the volume of a gas are inversely proportional in case of constant temperature within a closed system. It may sound pretty hard to understand what it is.

Well, we can describe the statement above into simple mathematics as following formula:

Boyle’s Gas Law: P x V = constant

Or express Boyle’s law in another term: P1 x V1 = P2 x V2

Where; P = Pressure and V = Volume

It sounds easy a little bit to understand.

Let’s apply Boyle’s law into our drilling business

Calculate the volume of gas you will have on the surface, 14.7 psi for atmospheric pressure, when 1 bbl of gas kick is circulated out from reservoir where has formation pressure of 3,000 psi.

Boyle’s Gas Law: P1 x V1 = P2 x V2

P1= 3000 psi (reservoir pressure)

V1 = 1 bbl (volume at bottom hole)

P2 = 14.7 psi (atmosphere pressure)

V2 = ? (volume at surface)

P1 x V1 = P2 x V2

3000 x 1 = 14.7 x V2

V2 = 204 bbl

Reference book: Well Control Books

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Working in the oil field and loving to share knowledge.

### 10 Responses to Boyle’s Gas Law and Its Application in Drilling

1. Pingback: Kick Tolerance Calculation‎

Thank you for your useful information. Kindly send me some Litrature fo Silicate Mud system and send us the testing procedure of Sodium Silicate in the system.

3. Alibek says:

Isn’t “P*V=const” when “T=const”?
Otherwise, it should be “(P*V)/T=const”. If I remember school programm well.

• Boyle’s Law is based on the Templerature constant therefore P x V = constant like you said.

4. Alibek says:

What I mean is that temperature of resourvoir is higher than temperature on surface.

• You need to apply temperature into the equation so the relationship will be PV/T = znRT.