The evaluation requirements for drilling operations are identified by the Reservoir and Petroleum Engineering Department and are incorporated in the drilling programme for each well, or as a separate test programme. The implementation of the evaluation programme at the well site is generally carried out by the Logging Engineer under the supervision of the Drilling … Formation Evaluation – Organisation and Responsibilities
This article presents the following Formation Strength Tests Calculations: – Formation Intake Gradient (FIG) – Effective Mud Gradient (EMG) – Maximum Allowable Annular Surface Pressure (MAASP) Formation Intake Gradient (FIG) FIG (psi/ft) = LOP + (CSD x MG) (CSD – RKB) Effective Mud Gradient (EMG) EMG (psi/ft) = LOP + (CSD x … Formation Strength Tests Calculations
A pre-job safety meeting shall be held before pulling the core barrel through the rotary table to ensure that the Drilling and Service Contractors’ personnel understand the job and potential hazards (eg., trapped pressures and catcher failure). Recovery – H2S If there is any possibility of the core containing H2S, only the Drilling Supervisor, Driller, … Core Recovery, Handling and Packing
Formation strength tests (FST’s – sometimes referred to as “leak-off tests” (L.O.T) or “limit tests” or “formation intake tests” (F.I.T)) measure the formation strength below the casing. FST’s, shall be done below all casing shoes (or outside milled casing windows for side-tracks) in exploration and appraisal wells. For development wells, the FST will be done … Formation Strength Tests Profiles and Definitions
Coring operations guidelines. Core samples are taken in order to measure accurately the reservoir parameters in hydrocarbon and water bearing formations, and also for other geological investigation. 1 General Coring Guidelines Fibre glass inner core barrel should be used. Use a full closure system type core catcher including i.e. a clamshell device that completely closes … Coring Operations Guidelines
Mud and data logging comprise two distinct but complementary operations which may be combined, or alternatively mud logging may be carried out on its own. 1 General Requirements Mud logging includes the following: Continuous logging of total gas and the chromatographic analysis of hydrocarbons. Detailed cuttings analysis including the description of lithology and hydrocarbon evaluation … Mud and Data Logging
Limit or leak-off tests in development wells may be omitted if no hydrocarbon bearing and/or overpressured formations are to be penetrated. Information obtained from leak-off tests in straight holes is not applicable to deviated holes in the same field (and vice versa). Only measurements in the deviated hole themselves should be used. It is not … Formation strength testing
Stuck logging tools are one of the non-productive time incidents experienced in well operations. Before logging, the Drilling Supervisor shall verify that the hole is in good condition and the well is not live. He shall also record the logging weak-point tension, cable tension limit and tool weight in mud. The Logging Contractor’s stretch chart … Stuck Wireline Logging Tools
The evaluation requirements for a particular well depend upon the type of well being drilled eg., development, appraisal or exploration. The detailed requirements for each well shall be indicated in the Well Proposal. 1. Evaluation Standards Evaluation Categories Typically, the formation evaluation carried out by the Drilling Department falls into two categories: Formation evaluation undertaken … Evaluation Standards
This article describes the responnsibilities for planing and safety, logging, Pipe conveyed logging(PCL), coring, mud logging, FST and Cement evaluation logging. Planning and Safety The Drilling Supervisor shall ensure: all personnel are familiar with the mandatory requirements for explosive and radioactive materials, (explosive magazines and radioactive stores shall be set aside in a designated, marked … Responsibilities for Evaluation Operations