What is a Monobore well?

“Monobore” describes a well where the diameter of the production conduit is uniform from the reservoir to surface.

What is A and B annulus?

Annulus B Measurement. The annulus of an oil well is the space between two concentric objects. In a completed well, there are normally at least two annuli. The A annulus is the space between the production tubing and the smallest casing string, while the B annulus is located between different casing strings.

What is wellhead completion?

Well completion is defined as a single operation involving the installation of production casing and equipment in order to bring the well into production from one or more zones (Perrin, 1999). From: Stress Corrosion Cracking, 2011.

What is annular pressure?

Annular pressure is the pressure that builds up in the spaces between the drill string and the external casing or borehole wall. Excess pressure can cause problems in a trenchless drilling operation. It is important to measure and monitor this pressure while drilling if possible.

What are the steps of well completion?

Well completion incorporates the steps taken to transform a drilled well into a producing one. These steps include casing, cementing, perforating, gravel packing and installing a production tree.

How does well head work?

Simply put, a wellhead is a system of spools, valves, and assorted adapters that used to provide pressure control of a production well. Its primary purpose is to provide a suspension point and pressure seals for the casing strings that run from the bottom of the hole sections to the surface pressure control equipment.

Where annulus is found?

Annulus are the ring like structures found in both mosses and ferns. An annulus in botany is a single row of specialized cells on the outer rim of a sporangium that serves in spore dispersal.

How do you calculate annular pressure?

P= (1.4327 x 10—7) x MW x Lx V2 Dh — Dp where P = annular pressure losses, psi L = length, ft Dh = hole or casing ID, in. Example: Mud weight = 12.5 ppg Circulation rate = 350 gpm Drill pipe OD = 5.0 in. MW = mud weight, ppg V = annular velocity, ft/mm Dp = drill pipe or drill collar OD, in.

What are the types of well completion?

Completions can be divided into three categories: open hole completions, liner completions, and perforated casing completions. In most wells, conventional single perforated casing completions are used; however, multiple, alternate, or slim hole completions may be used under certain conditions.

What is monobore well design?

Monobore Well Design An Aike–Barda Las Vegas field, Argentina To optimize and develop the existing completion 7-in. production casing and 4 1/2-in tubing (gas reservoir)

What size of monobore completion is best for gas wells?

9 5/8-in. big-hole monobore completion in gas wells. Production rate and cost analysis of different sizes of monobore completion (5 ½- in., 7-in. & 9 5/8-in.) Limitations were addressed in development of some components to

How to drill monobore wells in the Niobrara Shale play?

Enables Monobore Wells to be Drilled in the Niobrara Unconventional Shale Play with a Single Drilling Assembly Niobrara shale play Using Positive Displacement Motor (PDM) with short bit-to-bend technology to drill monobore horizontal well in one run and compare it to conventional well design wrt build-up rate, ROP, and number of days

Does wellbore diameter affect the inflow performance of slim-hole monobore completion?

performance as a function of wellbore diameter, slim-hole monobore completion has minimal impact on the inflow performance Completion tools and equipment need to be redesigned to fit the slim-hole monobore completion design (3 ½-in. or 2 7/8-in.) 24965-1992An Evolutionary Approach to Slim-Hole Many offshore and onshore fields