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$65$

Project in Pipesim

Problem statement

A production system is under study. The reservoir can be considered as homogeneous and cylindrical with a drainage radius of $2,{000}^{\text{'}},$ a thickness of ${200}^{\text{'}}$ and permeability of $20mD.$ The reservoir connate water is hydraulically connected to the surface, hence the reservoir pressure is hydrostatic. The pressure gradient due to water salinity is given in the following Table. The reservoir temperature is given in the following Table.

The well is a typical build$-$and$-$hold one $(2$D well$),$ that is it exhibits a vertical part $(L_1)$ followed by a curved one and another straight $($but inclined, $L_3)$ one so as to reach the target. The curved part has been drilled with an inclination build up ratio of $3\frac{}{{100}^{\text{'}}}$ thus leading to a curvature radius $R$ equal to $1,{910}^{\text{'}}.$ The diameter of the borehole within which the production casing has been installed is ${9\mathrm{.}75}^{\text{'}\text{'}}.$ The production casing has been installed down to the well bottom hole and it is an L$80$ grade one with an outer diameter of $8\mathrm{.}625"$ and a weight of $49lb\frac{m}{f}t.$

The tubing string is hanged from the wellhead and it arrives at $500\text{'}($MD$)$ above the well bottom hole. It is of the same quality as the production casing string and it has an OD of $3\mathrm{.}5"$ and a weight of $12\mathrm{.}8lb\frac{m}{f}t.$ The tubing and the casing string roughness is ${0\mathrm{.}001}^{\text{'}\text{'}}.$ A packer has been installed $700\text{'}($MD$)$ above the bottom hole. Additionally, an SSSV with a bean size of ${2\mathrm{.}25}^{\text{'}\text{'}}$ is installed at $1,{000}^{\text{'}}($MD$)$ and two closed sliding sleeves are installed at $3,000\text{'}($MD$)$ and at $5,000\text{'}($MD$)$ respectively.

The perforations are centred halfway between the bottom hole and the lower end of the tubing, that is ${250}^{\text{'}}$ below the tubing string. Note that due to some formation damage a skin factor of $2$ appears in the reservoir.

The temperature profile is assumed to vary linearly between the reservoir temperature at target depth and ambient temperature $(60F)$ at surface. The heat coefficient has been estimated at deg $($:$f{t}^2\}.$

The reservoir fluid is a black oil with an $R_s$ value of $500sc\frac{f}{b}bl,$ gas gravity of $0\mathrm{.}64$ and $30\frac{A}{P}$I $.$ The reservoir water specific gravity is $1\mathrm{.}02.$ No contaminants have been traced in the fluid composition.

The separator pressure has been set at $500$ psi.

Find the maximum water cut level that the production can bear until the liquid production rate falls below $1,000st\frac{b}{d}.$ What is the depth and the temperature at that depth where the fluid turns to a two$-$phase one?

Find the maximum water cut level that the production can bear until the oil production rate falls below $200$ stb$/$d$.$ What is the depth and the temperature at that depth where the fluid turns to a two$-$phase one?

A gas injection valve is to be set $300$ feet above the packers depth. Compute the required gas injection rate $(G$ as $s_g=0\mathrm{.}64)$ so as to double the liquid production rate when the water exhibits the maximum value found in q$.1.$ Do the same for q$.2.$

By assuming a water cut level of zero, find the relative reduction of the oil production rate if the skin factor increases from $2$ to $4.$ Similarly, find the relative increase of the oil production rate if the skin factor is removed due to some acidization project.

In a few years from now the reservoir pressure is expected to decrease by $500.$ Is it possible to maintain the original production rate by simply decreasing the separator pressure given that it can never be set to a value less than $200$ psi as this is the minimum pressure required to ensure flow to the sales point?

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$\backslash$table$[[,1,2,3,4,5,6,7,],[q($deg$/100$ ft$),3,3,3,3,3,3,3,$deg$/100\text{'}],[L1($ft$),2000,2500,4000,4000,2500,1500,3500,$feet$],[L3(ft),4000,3500,1500,1800,3500,4500,2200,$feet$],[(deg),30,40,20,25,10,30,35,$deg$],[T(F),200,180,175,215,195,182,188,$feet$],[$pi $($psi$)$ use the data number $5$ and i want pipe sim calculations if you cant pipe sim can u solve for paragraph two excel file deviation angle and length