Pengenalan Lapangan Migas Dan Pabum

 

Pengenalan Lapa La pang ngan an Mi Miga gass & Pan Panas as Bum umii By : Desmita Mariyani.B.M Gusmar Pakiding Jeanet Mayori.M Marya Reny.R.R Rani Ab Abriyana Yoki Samuel.S

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Background Drilling Drilli ng tec techno hnolo logy gy in geo geothe therma rmall fie fields lds ado adopts pts fro from m oil and gas dri drilli lling ng tec techno hnolog logy y. Mo Most st geot ge othe herm rmal al we well llss ar are e de desig signe ned d fo foll llow owin ing g th the e sa same me pr prin inci cipl ples es as th thos ose e us used ed in oi oill an and d ga gass in indu dust stry ry.. Although geothermal reservoir and oil/gas reservoir are similar, but there are several differences that could not be ignored. When drilling procedures in oil/gas fields are applied to geothermal fields, those diff di ffer eren ence cess gi give ve ba bad d si sign gnif ific ican antt im impac pactt to ge geot othe herm rmal al dr dril illi ling ng if th they ey ar are e do done ne wi with thou outt co cons nsid ider er th them em..

Differenc Diffe rences es betwe between en Oil/G Oil/Gas as and Geoth Geotherma ermall Drill Drilling ing

VS Temperature Hard – Rock Formations Large wellbore Low Reservoir Pressure Completion Method

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Types of Geothermal Geothermal Reso Resources urces 1. 2. 3. 4.

Liquid Domi Liquid Dominate nated d Vaporr Domi Vapo Dominate nated d Geopress Geop ressured ured Engineered Geotherm Geothermal al System (EGS)

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Temperature In geothermal needs : • Mud coolers Needed to keep fluid cool to maintain mud properties. •

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Mud Cake Gel Yield Carrying Capacity

High Temperatures can damage electronic drilling tools.

• High temperature electronics Directional tools are very temperature temperatur e sensitive •

Wireline electronic logging tools are also very temperature temperatur e sensitive •

•

Mud must be changed out prior to entering the productive reservoir. •

•

Bit program design must

take temperature and circulating media into consideration

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Temperature In geothermal needs : • High temperature cements Cements will need to be retarded to withstand reservoir conditions. •

Unlike Oil and Gas wells, casing in Geothermal wells need to be cemented across entire length.

• High temperature mud additives Gel (Bentonite) Muds can cause formation damage in production sections. •

•

High temperatur temperature e polymers are needed to clean the hole and stabilize the wellbore. •

•

Uncemented voids in casing annuli will result in casing failures (One of the primary important factor of a good geothermal well is a good cement job

Air or Aerated Fluids can be used due to low pressure formations. •

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Hard Rock Formation

Pahat Insert

Pahat Miltooth

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Large Wellbore

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Low Reservoir Pressure Underbalanced drilling was drilling was a common application in in highly  highly fractured and subnormal pressured formation as found in geothermal

Advantages of using underbalanced drilling : 1. Increases RO ROP 2. Pre Preven vents ts lost lost circu circulat lation ion in in low rese reservo rvoir ir press pressure ure 3. Pr Prev even ents ts stu tucck pip pipe e 4. Saving bi bit lilife

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Completion Method •

  Many geothermal wells are completed open hole and resource is produced

through casing. • Slotted or Perforated casing is utilized to filter large formation debris from entering flow stream. • Wellhead Wellhead completion are large diameter master valvethrough valvet hrough which the well was drilled

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THANK YOU