Starting at the bottom, obviously, the bit is the first and most important part of the bottom hole assembly bha. The assembly may be designed for slight build or drop tendency to counteract formation tendencies. Bottomhole assembly article about bottomhole assembly by. The bottom hole assembly bha is a key component of the drilling system, consisting of various components and tools including the drill bit itself which operate at the bottom of the wellbore and physically drill the rock. Bhapro bottom hole assembly model drilling software.
Wellbore trajectory is controlled by the type of bottom hole assembly used and the weight on the bit. In the air drilling process, the prebent pendulum bottom hole assembly pbpbha has excellent performance in controlling the well deviation and improving the wellbore quality, but the mechanism. Jan 12, 1999 the buildup rate causes bottom hole assembly 10 to contact lateral borehole a at point 84 where stabilizer 14 engages the lower side 90 of borehole a, point 86 where the wear pad 70 of bent housing 16 contacts lower side 90, and point 88 where bit 22 contacts the lower side 90 of borehole a. The packedhole assemblies contain three to five stabilizers properly spaced to maintain the angle. Introduction the drillstring design is the mechanical linkage connecting the drillbit at the bottom of the hole to the rotary drive system on the surface. Bottom hole assembly schlumberger technology corporation. The program allows up to 4 sections of drill pipe, four sections of hwdp, and four sections of drill collars. The lower portion of the drillstring, consisting of from the bottom up in a vertical well the bit, bit sub, a mud motor in certain cases, stabilizers, drill collar, heavyweight drillpipe, jarring devices jars and crossovers for various threadforms. Drilling bottomhole assembly dynamics rice university. The main outputs are the side force and displacement graphics.
It hangs below the drill pipe and provides weight to the drill or core bit to induce the teeth to penetrate the formation, thereby drilling a hole or recovering core to meet the scientific. Aramco shares its experience in constructing a computer software system that. Integrating drillpipe, instrumentation, measurement technologies, and bits, schlumberger bhas enable precise geosteering and optimal landing. It consists of a string below the drill pipe in a drill string. The bha is attached to the bottom of a long string of pipe called the drill string. Method and system for designing bottom hole assembly.
The oem bottom hole assembly bha kit has been used since 1980 by both large and small inspection companies for inspection performed on and offshore. Bit selection is a complicated issue that would take more space than i have here, but most drillers have a good idea what kind of bits to run, based on overall cost per foot. Tools and techniques to minimize shock and vibration to the bottom hole assembly spring 2014 iii abstract when drilling a well there is a risk of serious damage caused by drillstring vibrations. Drilling equipment bha tasman oil tools oifield equipment. The bottomhole assembly bha is the component of the drill string that includes the core bit, outer core barrel, various subs, and the drill collars. Complete analysis for bottom hole assembly design bha design. Bha design including bha reference and graphic drillingsoftware. Selection of optimum bottom hole assembly configuration. Bottom hole assembly bha design for directional control. Point 86 often serves as a fulcrum for bottom hole.
Contents 1 factors that determine drilling tendency of the bottom hole assembly bha. Heavyweight drill pipe, which has the same outer diameter as regular drill pipe but with thicker walls for. Bottom hole assembly bha modeling is always an essential part in directional drilling. The pressure measured in a well at or near the depth of the producing formation. Bottomhole assembly bha is a complex combination of several drilling tools including directional drilling assembly. Pcb manufacturing software assembly electronics for ems. The program allows up to 4 sections of drill pipe, four sections of hwdp, and four sections of. A method for selecting a bottomhole assembly, including performing a. Tools and techniques to minimize shock and vibration to. Tasman offers a comprehensive range of drilling equipment used in the bottom hole assembly bha of the drillstring.
It includes the drill bit, directional control and monitoring equipment, a mud. Shock and vibration are identified as a cause of premature failure on drill bit and components in the bottom hole. A downhole drilling assembly is all the equipment from the end of the drilling string to the face of the tunnel. Sep 10, 2014 bottomhole assembly bha design purpose components assemblies. For example, a flex component in the bha, which is a design feature, has a different effect on the bha response within different trajectories e. A state of the art windows graphical user interface gui program has been developed to predict and design the bottom hole assembly bha performance for drilling. Bottomhole assembly article about bottomhole assembly. A generic solution to bha bottomholeassembly modeling. This is the most complete system available with choices aplenty for the most experienced inspectors. It hangs below the drill pipe and provides weight to the drill or core bit to induce the teeth to penetrate the formation, thereby drilling a hole or recovering core to meet the scienti. The assembly can consist of drill collars, subs such as stabilizers, reamers, shocks, hole openers, and the bit sub and bit.
Pdf a state of the art windows graphical user interface gui program has been developed to predict and design the bottomhole assembly bha. Bha design 32 bit is a complete analysis for bottom hole assembly design bha design. Over the years, the bottomhole assembly has grown from one or two simple drill collars to quite a complex array of tools, stacking up above the bit about 500 to 1,000 ft 150 to 300 m. It provides the required force on the bit weight on bit to efficiently. This pressure may be calculated in a static, fluidfilled wellbore with the equation. Selection of optimum bottom hole assembly configuration using. Bottomhole assembly management system bhams onepetro. The intellijar software application will make recommendations regarding the appropriate placement of mechanical and hydraulic jars within a bottom hole assembly bha, based on the information you provide and using stabildrill best practices.
A mathematical model is proposed for studying the dynamic behavior of drillstrings, focusing on the lower section of the drillstring known as the bottomhole assembly or bha. The bottom hole assembly is an important part in the drilling process. The assembly can consist of drill collars, subs such as stabilizers, reamers, shocks, holeopeners, and the bit sub and bit. Prior to running a bha most oilfield service providers have software to model the bha behaviour such as the maximum wob achievable, the directional tendencies.
Introduction the drillstring design is the mechanical linkage connecting the drillbit at the bottom of the hole to. But when you get near the bottom, many specialized tools are needed to successfully drill. Bottomhole assembly bha components trican well service. May 01, 2017 starting at the bottom, obviously, the bit is the first and most important part of the bottom hole assembly bha. In order to make a usable hole in the earth, there has to be a connection from the rig to the ground and a way to remove the earth as you drill. The effects of rockbit interaction have also been incorporated. Predicting bottomhole assembly performance journal article. Predicting bottomhole assembly performance journal. A state of the art windows graphical user interface gui program has been developed to predict and design the bottomhole assembly bha performance for drilling.
There is an inherent complication in bottom hole assembly bha tendency modeling, which lies within the isolation of the impact of individual design and environmental factors. These bottom hole assmebly items are utilized in the drill string to achieve connection changes, regulate pressure, help guide the string, add or decrease the length. Bhapro is a bottom hole assembly modeling software that calculates the stress and bha components under complex downhole loading conditions. It is the lowest part of the drill string, extending from the bit to the drill pipe. A complete analysis for bottom hole assembly design bha design torque and harmonics. As such bottom hole assembly bha design can vary greatly from simple vertical wells with little or now lwd requirements to complex directional wells which must run multicombo lwd suites. The degree of nonelastic behavior of the formation during impact of the bottom hole assembly with the hole wall is represented by a restitution coefficient. Bha components consist of varying tool types from stabilizers, cross over subs, torque reducers, float subs, float valves, bull noses, zbits, pony collars, and drill collars. This data is then used by process engineers or test engineers to program. With these features the user is able to drill the hole as efficient as posible. A graphic design and all the critical properties of your bha. The bottom hole assembly bha is a portion of the drillstring that affects the trajectory of the bit and, consequently, of the wellbore. With our application, you can chosse what you want on the drilling string and see it visually with our module. Parker drilling is well equipped and staffed when your operation needs bottom hole assembly component rentals.
A computerreadable medium including software that, when executed by a processor causes the processor to design a configuration of a bottom hole assembly including components that include at least one stabilizer, the bottom hole assembly being connected with a drill string that also includes a drill bit, the designing including. We develop ready to run excel software for the petroleum industry. The bottom hole assembly, or bha, is that portion of the drill string closest to the drill bit. The new technology drastically reduces the time required to count parts so that user can return part to stock in fraction of the time that is required today. A bottom hole assembly bha is a component of a drilling rig. The position of drill string can be changed to suite all well designs all dcs or all hwdp. Bha designincluding bha reference and graphic complete analysis for bottom hole assembly design bha design. However, while both cup and mechanical style holddowns both offer satisfactory installations. Pdf dynamics of the bottom hole assembly during drilling. Oftentimes the assembly includes a mud motor, directional drilling and measuring equipment, measurementswhiledrilling tools, logging whiledrilling tools and other specialized devices. Components, together as a group, that make up lower end of drillstring drill bit, drill collars, drill pipe and ancillary equipment. Abstract the bottomhole assembly bha is one of the most critical downhole drilling string components that determines the course of the drilling operation and its efficiency. The drilling bottom hole assembly bha is the part of the drilling string which is below the drill pipes. Bottom hole assembly for directional drilling halliburton.
The increased stiffness on the bha from the added stabilizers keeps the drillstring from bending or bowing and forces the bit to drill straight ahead. A bottomhole assemblygeological formation dynamic interaction computer program. The xquik xray part counter can count part size from 01005 and up. It is able to locate contact points between bha components and wellbore wall, and also identify critical rotary spe ed rpm to avoid detrimental vibrations. The bottomhole assembly must provide force for the bit to break the rock weight on bit, survive a hostile mechanical environment and. The bottom hole assembly of the present invention includes a drill bit driven by a positive displacement drilling motor, the motor being constructed of tubular housings, one of said housings having a bend so as to cause the bit to drill directionally, another housing containing a rotor and stator to generate power, and a flexible section between the power generation housing and the bend. It can be as simple as bit and drill collars or it can be very complex and made up. For welltest purposes, it is often desirable to refer the pressure to a datum level chosen at a reference depth by calculating the pressure that would occur if the pressure measurement were made at the datum level rather than at the actual depth of the gauge. By adhering to this rule the chance of recovery from a failure is maximised. Over the years, the bottomhole assembly has grown from one or two simple drill collars to quite a complex array of tools, stacking up above the bit about 500 to 1,000 ft 150 to 300. In parallel, a comprehensive assessment of existing concepts and techniques for addressing drillstring dynamics is undertaken. Design and drawing of bottom hole assembly design and. A nonported float valve nrv shall be installed in all bottom hole assemblies which are used in top.
The bottomhole assembly must provide force for the bit to break the rock weight on bit, survive a hostile mechanical environment and provide the driller with directional control of the well. A stateoftheart bha program enables many critical applications such as i designing a bha to optimize directional performance, ii optimizing stabilizer locations to minimize vibration and increase downhole tool reliability, and iii improving survey. Quotation and cost estimation report instantly receive a report containing component counts for top and bottom of the pc board broken down by smt, fine pitch, bgas, thruhole, etc. Pcb manufacturing software assembly electronics for ems, cem. The bha is connected to the drilling rig by the drill pipe, an extendable hollow tube which conveys the mechanical and. The bottom hole assembly bha is the component of the drill string that includes the core bit, outer core barrel, various subs, and the drill collars. Oftentimes the assembly includes a mud motor, directional drilling and measuring equipment, measurementswhiledrilling tools, logging whiledrilling. Pdf implementation of a bottomhole assembly program. The assembly of drill pipe, sophisticated instruments and pipe called the bottomhole assembly, or bha, is the business end of the drilling rig. A mathematical model is proposed for studying the dynamic behavior of drillstrings, focusing on the lower section of the drillstring known as the bottom hole assembly or bha. The most common components of the bha are drill collars, stabilizers, shock absorbs, jars, reamers, heavy weight drill pipe and the drilling bit. Abstract the bottom hole assembly bha is one of the most critical downhole drilling string components that determines the course of the drilling operation and its efficiency. Bottomhole assembly bha modeling is always an essential part in directional drilling. Prior to running a bha most oilfield service providers have software to model the bha behaviour such as the maximum wob achievable, the.
Bottomhole assembly bha design purpose components assemblies. Equiped with accucount software developed by accuassembly inc. Tools and techniques to minimize shock and vibration to the. The bha design objective for directional control is to provide the directional tendency that will match the planned trajectory of the well. The pressure, usually measured in pounds per square inch psi, at the bottom of the hole. Heavyweight drill pipe, which has the same outer diameter as regular drill pipe but with thicker walls for greater weight, used as a transition between drill. Tightly closing a well so that hydrocarbons cannot escape. In compliance with european union eu legislation for visitors from the eu, schlumberger requests your permission to place cookies on your computer to both. To configure the bottom hole assembly, design optimization software is used to help in mitigating cost and eliminating ineffective drilling operations. If you are a human and are seeing this field, please leave it blank. It hangs below the drill pipe and provides weight to the drill or core bit to induce the teeth to penetrate the formation, thereby drilling a. The present invention provides a bottom hole assembly bha for connection to a drillstring for use in directing the path of a drill bit while rotary drilling, the bha comprising an apparatus for providing a modified cutting action of the bit in a predetermined portion of the hole, a stabilizer, and a flexible member interposed between the bit and the stabilizer.
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