Planning Technique-Key to Drilling Efficiency (includes associated papers 14971 and 15044 )
- D. Remson (Western Oceanic Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- September 1985
- Document Type
- Journal Paper
- 1,613 - 1,621
- 1985. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 5.6.1 Open hole/cased hole log analysis, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 1.6.10 Running and Setting Casing, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.7 Pressure Management, 6.1.5 Human Resources, Competence and Training, 5.5.11 Formation Testing (e.g., Wireline, LWD), 1.10 Drilling Equipment, 1.14.1 Casing Design, 1.14 Casing and Cementing, 1.6 Drilling Operations, 4.1.5 Processing Equipment, 7.5.1 Ethics, 4.2 Pipelines, Flowlines and Risers, 2 Well Completion, 1.1 Well Planning
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Drilling efficiency is a function of three variables: technology, equipment, and performance. Drilling contractors can improve the performance of their rigs by applying sound management principles to repetitive tasks. A well can be drilled on paper, so to speak, before it is drilled in practice. This type of planning helps to position everyone involved on the learning curve and permits problems and potential bottlenecks to be identified in time to take alternative action. Mutual expectations are developed between the operator and drilling contractor; therefore, the company man and the toolpusher have a common well plan and schedule that define these expectations. Their performance is measured so that deviations from expected performance can be identified on a real-time basis and dealt with effectively. On the basis of contemporary tests. we anticipate about a 10% reduction in time required to drill a given well, if the program described in this paper is fully implemented.
Before drilling a well, the drilling contractor receives a well prognosis from the operator. This prognosis, or plan, outlines the various parameters under which the well will be drilled, But even if the plan uses the latest drilling technology and if the contractor selected has the latest equipment, its ultimate success depends on the rig crew's ability to perform the drilling tasks in sequence. This paper describes a program in which the operator's well prognosis is reviewed thoroughly and systematically. The analyses undertaken are not academic, but are entirely benefit-related. Time- and pressure-related aspects of the plan are identified and quantified. The drilling schedule and related functions, such as rig maintenance and logistics, are separated into component parts, and planned, scheduled, and executed according to a predetermined, timed sequence. Benefits include these items: (1) time savings, (2) increased safety, (3) increased control over well progress, (4) creation of a data base for performance measurement and problem solving, (5) application of teaming-curve technology, and (6)enhanced crew morale and proficiency through goal setting and recognition.
Program Drilling efficiency is a function of three variables: technology, equipment, and performance.
DE = drilling efficiency, T = technology, E = equipment, and P = performance.
The proposed five-step program considers the contribution of "performance"to drilling efficiency. A basic premise provides that success depends on the rig crew's ability to understand the drilling plan. They must know and understand the duties and obligations of everyone involved and carry out the plan according to mutual expectations.
Step 1. Review the operator's well prognosis and quantify pressure-and time-related aspects. 1. The pressure profile is reviewed, and additional data are gathered if requested by the operator. Also, someone may add information because he has had previous experience in the area. The pressure profile is studied to identify the existence and location of transition zones, to select casing seats, and to define the difference between required wellbore pressure at any depth and the fracture pressure at the last casing seat. This information is very important in circumstances in which a narrow band of wellbore pressure is critical. Fig. I is a sample pressure profile. 2. The depth-vs. -time curve (historical rig time curve) is the operator's statement of acceptable rig performance. It must be studied in detail. In addition to time expectations, the information it contains, such as hole sizes, casing sizes, setting depths, mud weights, logging intervals, etc., is the basis for the contractor's planning and scheduling. 3. The remainder of the forecast is reviewed to provide familiarity with special requirements and features of the well. Operators differ as to how much information they furnish. Ideally, the prognosis contains sufficient information on the directional program, cementing program, possible problem areas, service companies to use, mud and bit records of previous wells, and other useful proprietary information. By taking these review steps, the contractor becomes familiar with the well program and ascertains the operator's expectations and the contractor's corresponding obligations. A degree of proficiency in understanding well plans is required to review the drilling prognosis adequately. In this regard, the program is prefaced by a training seminar for contractor rig management and supervisory personnel.
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