• drilling
    Drilling

    Schlumberger drilling CDs free download

    Schlumberger Drilling Course the biggest source ever about oil well drilling, from the biggest company in the oil industry fields. it helps you to understand the drilling process fro the beginning, in other words; it is an “A to Z drilling course” , With highly interactive show with visual and vocal effects illustrating drilling  and other topics related to oil production. it will give you a Complete training for understanding oil production. the cd’s are explained in 6 languages: – Arabic – English – French – Spanish – Indonesian – Portuguese As usual, AONG website provide this useful series for our users, in FREE direct links, with NO ads, you will find…

  • oil well drilling
    Drilling

    Oil Well Drilling Problems

        like any process in the oil industry, oil well drilling has its own problems,  and each problem has its own causes and remedy, you have to well-understand the drilling process to deal with drilling problems. we can summarize the drilling problems as follows: Oil Well Drilling Problems : – Stuck pipe – Lost circulation – Borehole instabilities – Mobile formation – Undergauge hole – Kicks and blowout (1). Stuck Pipe/Pipe Sticking: it is one of the most common problems in oil well drilling process. Definition: When part of the drill pipe or collars are stuck in the hole If pipe cannot be rotated or pulled and circulation is…

  • cementing
    Drilling

    Oil Well Cementing Functions, Classes and Equipment

        Functions of cement –  Restriction of fluid movement between permeable zones –  Provision of mechanical support of the casing string –  Protection of casing from corrosion –  Support of the well-bore walls to prevent collapse of formations The manufacture and composition of cement –  Raw material from calcareous and argillaceous rocks (limestone, clay, shale and slag). –  Dry raw materials finely ground and mixed in correction proportions (kiln feed). – Chemical compositions of dry mix determined and adjusted. – Kiln feed fed at a uniform rate in a sloping rotary kiln. – The mixture travels at the lower end. – Powdered coal, fuel oil or gas, fired into the kiln.…

  • well completion
    Drilling

    Well Completion Concepts

          Porosity Porosity is the fraction of the total volume of the rock that is pore (non rock) space or void and not made of solid pieces of the formation. It will be filled with a gas, water or hydrocarbon or two or more at the same time. Porosity will range from a high of 40-50% in some marginally consolidated chalk formations to a low of near zero in some of the evaporites (anhydrite). The average porosity of producing reservoirs ranges from about 5-15% in limestones or dolomites, 10-25% in sandstones and over 30% in many of the chalk formations. In most unconsolidated formation, porosity depends upon the grain…

  • drilling
    Drilling

    Water-Base Muds

        Drilling Muds A water-base drilling fluid is one that has water as its continuous or liquid phase. The types of drilling fluids are briefly described in the following lines. Freshwater muds are generally lightly treated or untreated muds having a liquid phase of water, containing small concentrations of salt, and having a pH ranging from 8.0 to 10.5. Oil-Base Muds differs from water base muds, Fresh water muds include the following types. Spud Muds These muds are prepared with available water and appropriate concentrations of bentonite and/or premium commercial clays. They are generally untreated chemically, although lime, cement, or caustic soda is occasionally added to increase viscosity and…

  • casing
    Drilling

    Oil Well Casing

        Types of Casing  Based on the primary function of the casing string, there are five types of casing to be distinguished. Stove or Surface Casing The stovepipe is usually driven to sufficient depth (15–60 ft) to protect loose surface formation and to enable circulation of the drilling fluid. This pipe is sometimes cemented in predrilled holes. Conductor String This string acts as a guide for the remaining casing strings into the hole. The purpose of the conductor string is also to cover unconsolidated formations and to seal off over pressured formations. The conductor string is the first string that is always cemented to the top and equipped with…

  • drilling
    Drilling

    how Drilling Fluid Additives are classified

          Each drilling fluid vendor provides a wide array of basic and specialty chemicals to meet the needs of the drilling industry. The general classification of drilling fluid additives below is based on the definitions of the International Association of Drilling Contractors (IADC): Alkalinity or pH control additives are products designed to control the degree of acidity or alkalinity of a drilling fluid. These additives include lime, caustic soda, and bicarbonate of soda. Bactericides reduce the bacteria count of a drilling fluid. Paraformaldehyde, caustic soda, lime, and starch are commonly used as preservatives. Calcium removers are chemicals used to prevent and to overcome the contaminating effects of anhydride…

  • fishing
    Drilling

    Fishing Equipment

    Fishing Operations and Equipment A fish is a part of the drill string that separates from the upper remaining portion of the drill string while the drill string is in the well. This can result from the drill string failing mechanically, or from the lower portion of the drill string becoming stuck or otherwise becoming disconnected from drill string upper portion. Such an event will instigate an operation to free and retrieve the lower portion (or fish) from the well with a strengthened specialized string. Junk is usually described as small items of non-drillable metals that fall or are left behind in the borehole during the drilling, completion, or workover operations.…

  • Drilling

    Well Control

    what is well control Basically, all formations penetrated during drilling are porous and permeable to some degree. Fluids contained in pore spaces are under pressure that is overbalanced by the drilling fluid pressure in the well bore. The borehole pressure is equal to the hydrostatic pressure plus the friction pressure loss in the annulus. If for some reason the borehole pressure falls below the formation fluid pressure, the formation fluids can enter the well. Such an event is known as a kick. This name is associated with a rather sudden flowrate increase observed at the surface. A formation fluid influx (a kick) may result from one of the following reasons:…

  • drilling
    Drilling

    Wells – Chemicals

    Chemicals Used in Fracturing The identities of chemicals incorporated in fracturing fluids were probably the first thing sensationalized about fracturing. The movie “Gasland” created quite a stir with the statement that a “cocktail” of several hundred toxic chemicals were “potentially” used in fracturing. The grain of truth was that there are many chemicals in additives sold for incorporation in fracturing; however; the fact is that most fracs use only a dozen or so major chemicals, some of which are food-grade additives and many are in parts per million concentration. About half of fracturing jobs are “slick water” fracturing fluid that often use low concentrations of two to five chemicals. Many…

  • Drilling Rotating Equipment
    Drilling

    Drilling Rotating Equipment

          Rotating system: the figure indicate the comparative sizes of the drill pipe and drill collar. Swivel ♦ The swivel hangs from the drilling hook by means of large bail, or handle. The swivel is not rotate, but allow everything below it to rotate. ♦ Drilling fluid is introduced into the drill stem through a gooseneck connection on the swivel, which is connected to the rotary hose. Power Swivel ♦ When a ‘top-drive’ system is used, the swivel is replace by power swivel. ♦ The power swivel performs the same functions as the ‘normal swivel’, but it is also associated with a transmission system used to rotate the…

  • drilling
    Drilling

    Oil-Base and Synthetic-Base Muds

    Drilling Mud Tests The field tests for rheology, mud density, and gel strength are accomplished in the same manner as outlined for water-based drilling mud. The main difference is that rheology is tested at a specific temperature, usually 120◦F or 150◦F. Because oils tend to thin with temperature, heating fluid is required and should be reported on the API Mud Report. see our Drilling Fluids Books section Sand Content Sand content measurement is the same as for water-base drilling mud except that the mud’s base oil instead of water should be used for dilution. The sand content of oil-base mud is not generally tested. HPHT Filtration The API filtration test result for oil-base drilling…