The whole process of logging
Coordinates of well location—initial well location, re-measurement—design—team, equipment, material and data preparation—design disclosure, logging condition inspection—various logging—well completion discussion—well completion operation—well completion data collation and submission , Acceptance rating – print binding and filing.
1. The coordinates of the well location: the units that send the coordinates are: oil production plants, earth institutes, etc.
2. Initial re-measurement of well location: survey team completed
The re-measurement of the well position shall be completed before the drilling. Party A stipulates that the well position survey and initial measurement shall not be carried out for the wells that have not been tendered or arranged.
3. design:
(1) Preparation process: receiving the notice – collecting the data of the adjacent wells – designing – submitting for review – printing and binding – issuing.
(2) Design content:
Exploration well: ①Basic data
②Introduction to regional geology
③Design basis and drilling purpose
④Designed stratigraphic profile and predicted location of oil and gas water layers
⑤ Formation pore pressure prediction and drilling fluid performance requirements
⑥ Request for information
⑦Sample selection requirements
⑧Well body quality requirements, midway test requirements
⑨Technical description and requirements
Development well: ①Basic data sheet
②Drilling purpose and design basis
③Design layered and offset well layered data
④ Offset well data
⑤ Principle requirements for the use of drilling fluid
⑥ Request for information
⑦Cementing cement back to high requirements
⑧ Tips and requirements for projects
⑨Attachment and attached table
4. Preparation for going to the well:
(1) Team: The comprehensive logging team is generally 6-7 people, and the geological team is 3 people.
(2) Equipment: The exploratory well shall be equipped with instruments according to Party A’s requirements
(3) Materials: sand sample boxes, sample bags, labels, analytical drugs and reports, etc.
(4) Data: logging map of adjacent wells, well logging map, relevant geological data of the block
5. Design disclosure (geological disclosure): completed before the second opening or logging
(1) Development well: the team is responsible for
(2) Rolling wells and exploratory wells: Party A’s organization and logging personnel participate
(3) Contents disclosed by logging personnel:
①Basic data of the well design, geological data of blocks and adjacent wells
② Logging task requirements
③Engineering tips
④ Requirements for logging conditions
(4) Logging condition inspection: completed before and during the logging process, the development wells are in charge of the brigade, and the production management center conducts random inspections; the rolling wells and exploration wells are inspected by the “center” or Party A’s personnel.
Contents of logging condition inspection: quantity and quality of logging team, installation and commissioning of logging equipment, material preparation, water for sample washing, sample fishing environment, power supply conditions and document preparation, etc.
6. The logging contents include:
(1) Logging during drilling
(2) Cuttings logging
(3) Fluorescence logging
(4) Gas logging logging and comprehensive logging (including chromatography, engineering parameters and full sample removal)
(5) Core logging (drilling coring, wellbore coring)
(6) Drilling fluid logging (density, viscosity, water loss, chloride content)
(7) Geochemical logging and quantitative fluorescence logging
(8) Admission of special operation data (logging, midway testing, casing running, cementing and pressure testing, etc.)
7. Completion discussion: The time is generally notified by the logging company, and Party A organizes and participates in the logging and logging institute personnel.
(1) Information that logging personnel should provide:
①、Basic data of design and completion of drilling, well deviation and target situation, drilling fluid usage and complex engineering accidents, etc.
②. Statistics of logging layered and segmented oil and gas display layers, display during drilling and after-effect display
③. Geochemical, gas measurement, quantitative fluorescence and comprehensive interpretation results
④. Logging stratigraphic comparison and drilling knowledge
(2) Determination of completion discussion data:
Contents: Oil top, oil bottom, resistance, short joint, cement return height and matters needing attention
Generally, the resistance is 30 meters below the oil bottom, and the short section is 30 meters above the oil top or 30 meters above the main oil and gas layer. The return height requirements are: 100-150 meters above the oil top and 200-300 meters above the gas top. When the completion discussion data is issued, Party A shall notify the logging unit, and the logging unit will issue it to the team, drilling unit and engineering supervision center.
8. Completion operations: – The process from drilling to completion. include:
(1) Completion electrical logging: The logging unit shall fill in the logging notice according to the design requirements, the exploration well shall be approved by Party A, and the notice shall be issued to the logging unit 24 hours before the logging operation.
Logging content: standard, combination, well deviation, special project
Well logging series: general I, general II, domestic CNC, CSU
(2) Lowering the oil layer casing: according to the completion discussion data and requirements, the oil casing is installed, focusing on checking the lower depth, choke ring and the position of the short joint. Depth of casing == connection + total length of casing string + length of casing shoe
(3) Casing cementing: mainly collect process content and timeliness, including: cementing time, cement injection volume (t), cement slurry density (maximum, minimum, average), replacement drilling fluid volume and performance, and impact pressure.
(4) Cementing quality logging (measurement of sound amplitude, variable density, etc.): pay attention to whether the return height, short joints, and artificial bottom meet the actual and standard requirements.
(5) Completion pressure test: The pressure test must be done with a cement truck, and the mud pump of the well team is not allowed to be used for pressure test! The pressure test of the oil jacket is 25MPa, and after 30 minutes, the pressure drop is less than 0.5MPa, which is qualified. Completion time: the time when the data collection of the last process is completed.
9. Completion data are sorted and submitted for acceptance rating (exploration wells also need internal audit and Party A review)
10. print binding for filing
