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From Tables ?Tables55 and ?and6,6, we will see that mudstone interbed whose thickness and elasticity modulus are huge can restrain shrinkage successfully and mitigate risk of drill pipe sticking. When the mud density is intended Mizoribine in drilling engineer, thickness and elasticity modulus of mudstone interbed need to be comprehensively selleck bio deemed.5. The Effect with the Thickness and Elasticity Modulus on Equivalent Strain on CasingWhen the influence of thickness and elasticity modulus of mudstone interbed on casing equivalent tension are analyzed, the internal strain of casing is ignored. The outcome of no. 1 simulation scheme is proven in Figure 3, from which we will know that with the increasing of thickness, the equivalent tension of casing while in the middle of mudstone interbed decreases, so does the equivalent strain of casing during the middle of salt rock.



The equivalent pressure from the middle of salt rock is greater than that of in the middle of the adjacent mudstone interbed. The accident of casing collapse is much more likely to take place from the middle of salt rock than while in the mudstone interbed. When the thickness of mudstone interbed increases from 0.2m to 2.0m, the equivalent stress on casing inside the middle of salt rock decreases from 364MPa to 339MPa, as well as equivalent stress inside the middle of mudstone interbed decreases from 357MPa to 304MPa. The equivalent tension of casing tends to get stable twelve months later on.Figure 3Relationship in between the thickness of mudstone interbed as well as the casing equivalent pressure. (A) The casing equivalent tension while in the middle of salt rock.



(B) The casing equivalent stress while in the middle of mudstone interbed.Figure four exhibits the consequence of No. 2 simulation scheme. With the escalating of elasticity modulus of mudstone interbed, the casing equivalent stress while in the middle of mudstone interbed decreases, so does thep53 signaling equivalent tension of casing inside the middle of salt rock. Once the elasticity modulus of mudstone interbed increases from 10GPa to 30GPa, the equivalent anxiety on casing from the middle of salt rock decreases from 352MPa to 315MPa, and the equivalent tension inside the middle of mudstone interbed decreases from 327MPa to 291MPa. The equivalent anxiety on casing tends for being basically stable soon after twelve months.Figure 4Relationship in between the elasticity modulus of mudstone interbed as well as the equivalent strain on casing.

(A) The casing equivalent worry from the middle of salt rock.

(B) The casing equivalent tension within the middle of mudstone interbed.From Figures ?Figures33 and ?and4,4, it's clear that the casing in salt rock stratum with mudstone interbed which has small thickness and reduced elasticity modulus runs a larger risk of casing collapse. When we style the casing strength in drilling engineer, thickness and elasticity modulus of mudstone interbed ought to be taken into consideration.6.