well bore

As the well is being drilled, formation fluid flows into the wellbore and up to the surface.

A particularly crooked place in a wellbore where the trajectory of the wellbore in three-dimensional space changes rapidly.

The surface force per unit area exerted at the top of a wellbore when it is closed at either the Christmas tree or the BOP stack.

The point or depth at which a tool or drift of a specific size can no longer pass through the wellbore.

An uncontrolled flow of reservoir fluids into the wellbore, and sometimes catastrophically to the surface.

Carbon steel coiled tubing (CT) strings have been used in sour wellbore environments for many years.

Wellbore instability is one of many problems that have been encountered during field tests.

A downhole tool on which downhole gauges or instruments that are to be temporarily left in the wellbore are attached.

A device that can be run into a wellbore with a smaller initial outside diameter that then expands externally to seal the wellbore.

Obviously, such an action limits future options and is employed only as a last resort to regain pressure control of the wellbore.

Kill procedures typically involve circulating reservoir fluids out of the wellbore or pumping higher density mud into the wellbore, or both.

A condition whereby the drill string cannot be moved (rotated or reciprocated) along the axis of the wellbore.

A condition that may occur when a coiled tubing string is run into a horizontal or highly deviated wellbore.

Corrosion-resistant alloys can be formulated for a wide range of aggressive wellbore conditions.

A multi branch well is defined as a well that has more than one branch drilled from a single site and connected back to a single wellbore.

The purpose of reciprocating the drill string is usually to clean cuttings and other debris from the wellbore.

The influence of Poisson's ratio on the surrounding rock strain around the wellbore can be ignored.

The method can be used to calculate the the end time of effect of wellbore storage with start-up pressure gradient considered.

An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore.

It must not be over-displaced otherwise the critical near-wellbore area of the fracture will not be propped.

A simple slick line tool used to dislodge or push tools or equipment down the wellbore.

For a gas well the flow versus the difference of the squares of the average reservoir and wellbore pressures are plotted on log-log paper.

This in turn requires longer step-out wells, pushing kickoff points higher up the wellbore, often occurring within extensive salt bodies.

A formal plan developed for a specific well with predictions and requirements at various intervals of the wellbore depth.

The production model of wellbore tool is one of typical many varieties, medium and small batch production mode.

Drillers depth is the first depth measurement of a wellbore and is taken from the rotary table level on the rig floor.

when wellbore pressure is less than formation pressure, some drilling fluid still flows into the fracture.

In the case of junk, the metal must be broken into smaller pieces to facilitate removal from the wellbore so that drilling can continue.

Lost time due to wellbore instability and tools lost in a borehole leads to higher drilling expenditures and delayed production.

Bow-spring centralizers are used to keep casing in the center of a wellbore or casing ( "centralized" ) prior to and during a cement job.

Pressures and flow field and temperature distributions in a wellbore are necessary factors to the drilling operation while drilling a well.

The experimental results show that the anisotropy of the mechanical property in the plane perpendicular to the wellbore axis is existing.

The activity of the water and properties of the solutes are two significant factors affecting wellbore instability in shale.

High pressure squeeze increases formation stress around the wellbore.

The flow of oil and sand mixture in horizontal wellbore is a special flow model of solid-liquid two phase flow in pipe flow actually.

Atmospheric corrosion is generally associated with surface storage conditions, or with upper wellbore annuli that may not be fluid-filled.

In much stress element of creating wellbore stability, mud density is only can controlled.

Thus, by circulating out, the gas bubble is eased out of the wellbore safely.

The circulated fluids should be capable of removing the milled material from the wellbore.

The wings of the fracture extend away from the wellbore in opposing directions according to the natural stresses within the formation.

The action of forcing a pipe or tubular into a well against wellbore pressure.

The mills, or similar cutting tools, must be compatible with the fish materials and wellbore conditions.

The paper deals with the model of a pulsing theory considering wellbore storage and wall skin effect.

A downhole tool with a profiled external surface designed to catch and retrieve junk or debris from the wellbore.

Establish the transient flow model of the horizontal well for the uniform flux and infinite conductivity wellbore type.

An acid treatment placed in the wellbore over the interval to be perforated.

The instrument hanger is run into the wellbore on slick line and set in a completion nipple at the required depth.

Each formation will create different effects on the wellbore due to the paraffin content, depth and formation porosities.

For most vertical wellbores, inclination is the only measurement of the path of the wellbore.

Large-diameter hydraulic cylinders, normally retracted, force the two halves of the cover together in the middle to seal the wellbore.

Thus, it could be thought of as miniaturized 4D seismic and permanent log in an individual wellbore.

Information transmission between ground and down hole is the of key the closed-loop control system of wellbore trajectory.

WBFs fall behind with respect to shale inhibition, wellbore stability, rate of penetration (ROP), and fluid stability.

The force required to insert a tool or tubing string into a live wellbore.

Wellbore Strengthening Reducing lost circulation costs through fracture prevention.

The nonlinear effects of the curvature of wellbore on the lateral forces on bit are shown through the computations.

On the basis of this, the mathematical models of carbon monoxide flow and diffusion in wellbore were established.

Real-time surveillance practices were also improved to ensure wellbore breakout was detected earlier and corrective measures taken quickly.

Therefore, it is necessary to develop a calculation method applied to the wellbore pressure and temperature of condensate gas well.

A flow of reservoir fluids into the wellbore during drilling operations.

A wellbore tubular in which slots or holes have been made before the string is assembled and run into the wellbore.

A type of refraction survey to help define a salt-sediment interface near a wellbore.

Then the top valves of the tree are opened to enable the tools to fall or be pumped into the wellbore under pressure.

In the drilling field a drill string, formed of lengths of drill pipe joined in end-to-end relationship, is fed down the wellbore.

With the new three-dimensional FEM model, some research is done on the ERD wellbore stability under elastic and elastoplastic conditions.

The section of wellbore that has been prepared for production by creating channels between the reservoir formation and the wellbore.

In high-sulfur gas reservoir process, the formation, wellbore and surface gathering pipelines would appear sulfur deposition.

Horizontal wells are the advantages of oil wellbore and reservoir increases the direct contact area.

Secondly, in the horizontal gas wells, wellbore annulus flow of gas - solid two-phase flow.

In this paper, the flow model in reservoirs and the fluid flow model within horizontal wellbore are obtained by a semi-analytical method.

A subset of the more general term "directional drilling, " used where the departure of the wellbore from vertical exceeds about 80 degrees.

To create holes in the casing or liner to achieve efficient communication between the reservoir and the wellbore.

Synthetic-base muds (SBM) provide excellent wellbore stability and maximum ROP, particularly in combination with PDC bits.

For improving the permeability of contaminated oil and gas near wellbore area, people have carried out a lot of useful exploration.

Graphite is utilized to seal and isolate the near wellbore fractures at the tip along with optimizing the rheology of the SBM.

A downhole tool used to cut tubing or similar tubulars that have become stuck in the wellbore.

Under production with constant pressure, the pressure loss in the wellbore has obvious effect on the production rate at the initial period.

Wellbore temperature is an important parameter in high pour-point oil field development.

It is important to improve the heat insulation effect of wellbore by some methods for ensuring the efficiency of thermal recovery.

The calculation of wellbore pressure distribution in gas wells makes great sense for gas well design and performance analysis.

In the light-pipe condition the string will be ejected from the wellbore if the gripping force of the slips is lost.

Removing cement plug in oil pipes with chemical methods can reduce difficulty of mechanical operation and damage of wellbore.

Changing the kill fluid capacity and inlet temperature can adjust the wellbore temperature effectively.

A new coalbed methane transient seepage flow model with multi-wells is developed by considering the wellbore storage and skin effect.

when LD is smaller, the dimensionless wellbore radius has great effect on wellbore pressure response and long-term productivity.

A type of packer that uses an inflatable bladder to expand the packer element against the casing or wellbore.

A design feature on packers and similar downhole tools that occupy a large proportion of the drift diameter of the wellbore.

A drill stem test performed in an open hole section of the wellbore.

Such formations require an inhibitive fluid to maintain a stable wellbore and prevent enlargement, or wash outs .

When using hand tools around the rotary table or the wellbore, be sure to cover the hole.

Such formations require an inhibitive fluid to maintain a stable wellbore and prevent enlargement, or wash outs .

When using hand tools around the rotary table or the wellbore, be sure to cover the hole.

Large number of lateral hole has a great effect on the production of main wellbore.

A mud additive for lowering torque (rotary friction) and drag (axial friction) in the wellbore and to lubricate bit bearings if not sealed.

Designed of the wellbore which withstand high temperature and high pressure.

To attempt to retrieve a fish from a wellbore.

To stop a well from flowing or having the ability to flow into the wellbore.

Surface pre-orienting drilling technology is employed for preventing wellbore from collision and channeling in CDXA Cluster Wells.

So, it's very important to research on temperature distribution within the wellbore and oil reservoir.

The wellbore evaluating model was build considering the liquid-solid-wetting coupling.

The wellbore evaluating model was build considering the liquid-solid-wetting coupling.

Experimental study on physical modeling of the foaming oil wellbore.

In the heavy-pipe condition, the string will drop into the wellbore if the gripping force is lost.

In the drilling process, the collapse of wellbore wall is severe in the Cretaceous and Jurassic strata.

However, wellbore problems continued and attempts to solve this problem with the use of oil-based mud were unsuccessful.

Wellbore and formation are connected by Ramey heat-transfer coefficient.

The study work of wellbore stability and capacity to carry rock cutting during liquid UBD and gas drilling is developed.

A relatively small volume of specially prepared fluid placed or circulated in the wellbore.

Chemical materials and wellbore compatible.

An improved algorithm has been developed according to the problems of the conventional algorithm for wellbore heat loss.

An improved algorithm has been developed according to the problems of the conventional algorithm for wellbore heat loss.

The foam plug removal technology is studied aimed at the chocking problem of near wellbore formations in the process of production.

The elastic stability problems of wellbore are studied according to the anisotropic strength criterion.

A wireline device that is used to remove sand or debris from the bottom of the wellbore.

Unlike sand migration that is best stabilized, the material mobilized in fines migration should be produced to avoid near-wellbore damage.

Wellbore instability caused by brittle shale is a very complex problem during drilling.

To deepen the wellbore by way of collecting a cylindrical sample.

Perfo Frac is a new technique which combines perforation with high energy gas fracturing to improve near wellbore zone.

chemo-mechanical effects on wellbore stability.

During drilling well, keeping wellbore stability is very important for drilling normally.

During drilling well, keeping wellbore stability is very important for drilling normally.

To alternately raise and lower the drill string, casing string or liner in the wellbore.

Steam jet pump is a kind of oil production device which can supply energy for oil lifting and improve the temperature of oil in wellbore.

For reducing wellbore's viscosity of lukeqin heavy crude oil , this paper will solve it by emulsification of crude oil.

The unloading process for long32 is simulated with numerical method by dividing wellbore into minim cell.

A well system includes a main wellbore extending from a terranean surface toward a subterranean zone.

A remedial cementing operation designed to force cement into leak paths in wellbore tubulars.

A valve located on the Christmas tree that controls all flow from the wellbore.

A packer assembly that can be removed from the wellbore only by drilling or milling.

The affect factors on pattern of wellbore pressure&temperature are production rate, gas composition, geothermal gradient and so on.

The affect factors on pattern of wellbore pressure&temperature are production rate, gas composition, geothermal gradient and so on.

The more tortuous the wellbore, the more areas for sand and particles to settle.

After the responsibility of model is verified by case history, the sulfur depositional law in wellbore for PuGuang gas field is analysed.

A mechanical device to position casing concentrically in the wellbore.

A perforating charge designed to provide a long perforation tunnel, such as may be required to bypass any near-wellbore damage.

In the meantime, the paper introduces how to raise the effective viscosity in annular so as to enhance wellbore purification capacity.

A balanced plug of cement slurry placed in the wellbore.

What pressure is the wellbore tested to?

To plug the wellbore around a drill string.

In some designs, they are flat at the mating surfaces to enable them to seal over an open wellbore.

In some designs, they are flat at the mating surfaces to enable them to seal over an open wellbore.

Findings have a guiding role for the use of exploding in the wellbore technology in oilfield.

the mixed loss caused by inflow from wellbore is ignored.

The depth at which a tubing or coiled tubing string that is stuck in the wellbore is free to move.

We must take the overall design of fluid in the wellbore into consi. . .

In the process of perforated completion, the oillet of perforation should go deep into reservoir in order to communicate wellbore and layer.

A ball that is dropped or pumped through the wellbore tubulars to activate a downhole tool or device.

For example, a deviated wellbore has a longer length than vertical depth.

A Study on Dynamic Distribution of the Liquid-carrying Critical Velocities and Flow Rates along the Wellbore of Gas Wells

A Method for Determining the Critical Time of Wellbore Instability at Water-sensitive Shale Formations

A Method for Determining the Critical Time of Wellbore Instability at Water-sensitive Shale Formations

Simulation of a strapdown inertial continuous wellbore survey algorithm

Wellbore Stabilization and Experimental Study of Reservoir Protection of PRD Drill-in Fluid

Bachu exploration block; deep well; drilling; pipe stuck prevention; wellbore stabilization; penetration rate raising;

Mathematical model and its application in well test with injection into wellbore for oil well in homogeneous reservoir

Researches on the Coupling of Formation Percolation and Wellbore Multiphase Flow and Its Application

Transient productivity prediction of bottom-water drive reservoir in horizontal well under a coupling of wellbore with reservoir

Accurate Solution of Two-Layer Reservoir with Crossflow Including Wellbore Storage and Skin Effect

Countermeasure for Protecting Wellbore Stability while Gas-liquid Transformation during Drilling

Exploding in the Wellbore; Oil Well Productivity; Conformal Transformation; Nodal System Analysis; Electric Analog;

Well test interpretation method for triple-media oil reservoir in which fracture communicated with wellbore

Numerical Simulation of the Coupling Flow between the Wellbore and Oil Reservoir

Theoretical Research on the Pressure Distribution in the Wellbore of Multilateral Horizontal Wells with Open Hole Completion

Theoretical and Experimental Research of Pressure Drop for Variable Mass Intermittent Flow in Horizontal Wellbore Flow

Flow Model of Variable-mass Gas-Liquid Stratified Flow in the Wellbore of a Horizontal Hole

The Modelling of Wellbore Pressure Performance During Extreme Overbalance Perforation

Wellbore Strengthening & Lost Circulation Material

Near-Wellbore Modeling to Assist Operation of an Intelligent Multilateral Well

Defects in and Advices for Liner Cementing Tools in Sidetrack Slim Wellbore

Theoretical and experimental research on pressure drop of variable mass dispersed bubble flow in horizontal wellbore

Productivity Calculation for Near-Wellbore Scale of Horizontal Well with Partial Degasification

Reasonable Casing Rotary Speed under Different Casing-Wellbore Dimensional Assembly

Wellbore Temperature Distribution in Condensate Gas Well by Electromagnetic Heating

This comprehensive approach to modeling WBS during the wellbore construction process also accounts for (1) ECD, swab and surge pressures;

Objective description and calculation of drilled wellbore trajectories

Theoretical Model and Numerical Investigation of Near-Wellbore Effects in Hydraulic Fracturing

Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations

Status of Research on Vertical Conduit Flow of Gas-Liquid Two Phases in Wellbore

The Analysis of Inertial Measurement Technology Applied to the Oil or Gas Wellbore

Monitoring Wellbore Cleaning Degree and Sticking Possibility in Offshore Extended Wells

Effect of temperature and pressure on fluid column pressure of wellbore drilling fluid in deep-water drilling with oil-based drilling fluid

Computation Precision Analysis of Wellbore Trajectory by Natural Parameter Method

Deviation Percent Model to Analyze Target Hitting of Actual Horizontal Wellbore Trajectories

Method Evaluates Wellbore Stimulation Efficiency

Evaluation of Wellbore Stability Through Advanced Logging Technology

Transient Well Performance Prediction with Coupling Reservoir and Wellbore

Thermal Recovery Numerical Model Coupling Flow in Reservoir With Various-Mass-Rate Flow in Horizontal Wellbore

Optimizing design of wellbore trajectory of three-dimensional multi-target directional well

Theoretical research for improving temperature distribution of fluid in wellbore using heat pipe

Wellbore instability and control technologies in the Triassic system and Carboniferous system in Tahe Oil-field

An Analytical Model of Pressure Drawdown of Gas and Liquid Two-phase Annular Fog Flow With Variable Mass in Horizontal Wellbore

Mechanism Model for Predicting the Distributions of Wellbore Pressure and Temperature

Experimental research on flow pattern transition of gas-liquid two-phase variable flow in horizontal wellbore

Calculation of Heat Loss Considering the Variety of Wellbore Pressure During Steam Injection

Wellbore Structure, Completion Methods and Stimulation of Rolling Exploratory Well in Yibin Jialingjiang Reservoir

The Analysis of Stabilization of the Wellbore with Anisotropic Rock Formation

Wellbore Performance Analysis of High-Temperature High-Pressure Condensate Gas Wells

Microbial Wellbore Treatment for Paraffin Deposition Control and Viscosity Reduction in Production Wells at Faulted Reservoir K90

Wellbore Pressure Drop Calculation Considering the Radial Inflow Through Wall in the Extended Reach Well

Method of In-situ Stress Measurement in Foothill Structure and Wellbore Stability Analysis Model for Vertical Wells

The determination of in-situ stress from wellbore breakouts in the main borehole of the Chinese Continental Scientific Drilling

Law of temperature influence on wellbore stability in hot well

Application of the Track Control and Drilling Technology of Left-hand Wellbore to Bohai Gulf

Numerical simulation of steam injection down the wellbore

The Dynamic analysis for condensate banking around wellbore in condensate gas reservoir

Discussion on the Mechanical Factors of Wellbore Instability of Air Drilling in Qingxi Oilfield

Application of Wellbore Stability Analysis of Weak-surface Formation in Tarim Oilfield

Distinction of near - wellbore friction and perforation friction

Reckon Model of Stable State Oil Rate of Vertical Fracture Well With Wellbore Flow

The Specific Properties of Horizontal Wellbore and the Optimal Analysis on the Perforation Density

Transonic gas-water separation and liquid drainage technology by swirling flow in gas wellbore

Oil Gas Occurrence and Flowing Features of Near wellbore Formation in Condensate Gas Reservoir

An Analysis of Drilling Information Transmission Behavior in Wellbore

Non-planar propagation of hydraulic fracture near horizontal wellbore

Dynamic performance analysis on horizontal wellbore

Eliminating wellbore-storage effects by improving ISA technique

Coiled-Tubing Perforation and Zonal Isolation in Harsh Wellbore Conditions

Pressure drop of variable mass flow in perforation completion of horizontal wellbore

A Mechanical-Chemical Model for Shale Wellbore Stability Under Solute Diffusion

Calculating models for heating area of horizontal wellbore in steam stimulation

Corrosion Mechanism and Protection Measure of Wellbore of Oil Well in Changqing Oilfield

Review on Model of Wellbore Temperature Distribution during Drilling

Influence of Flow Velocity on Viscosity Reducing of Wellbore and Oil - water Mixed Flow Pipeline

Application of Wellbore-lifting Technology in Cold Production of Viscous Crude

A New Idea of Wellbore Stability: Conservation of Energy

Calculation of fluid temperature distribution in wellbore with heavy oil pump

Physical modeling of heat transmission in wellbore insulated by nitrogen

The factors influencing the wellbore temperature in heavy oil production

Discussion on several models on permeability variation in the vicinity of wellbore area

Process design of electrothermal lifting by wellbore Kelvin effect

New formula of drilling mud density of the control wellbore closed rate in salt bed

Well Test Analysis for Water and Oil Two Phase Flow with Wellbore Storage

Analytical solution of temperature in wellbore and formation in multi-layer

Pressure Gradient Model for Variable Mass Fluid Flow in Horizontal Wellbore

Experimental research of flow mechanism of near wellbore area of fishbone wells

A Method of Determining Aerated Drilling Fluid Density for Wellbore Stability

Effects of wellbore gap on transverse vibrations of bottom hole assemblies

Discussion on the Wellbore Deviation Controlling in Air Drilling

Conventional PM technique at immediate vicinity of wellbore

Calculation method of wellbore heat transfer and heat loss during steam injection

Well test interpretation method for triple meduim reservoir with variable wellbore storage

Analysis on Heat Transfer and Steam Injection in the Wellbore and Calculation on Heat Loss

Study on Transition of Gas-Liquid Two-Phase Variable Mass Flow in Horizontal Wellbore

Analysis of Wellbore Creep Shrinkage in Inclined Salt Formation

Influence of Silicate Base Drilling Fluid on Wellbore Stability of Shale

Calculation of Wellbore Steam Parameters for Extra-and Super-Heavy Oil Wells

Improved algorithm of wellbore heat loss calculation

Mechanism study on the potassium ion stabilizing wellbore

Experiment of super heavy oil wellbore visbreaking by active water instead of electric heating

Laboratory Detection of Viscosity of Oil-water Mixture in Wellbore