Essay Example on Well Completion Report Summary

Published: 2023-02-22
Essay Example on Well Completion Report Summary
Type of paper:  Essay
Categories:  Engineering Energy Geology
Pages: 6
Wordcount: 1390 words
12 min read

The drilling of the Whicher Range makes it the second-most bottomless well in the Southern region of the Perth Basin. The No. 1 deepest well, Sue is 16 miles away to the Southern part of Whicher Range. This well had a penetration of this well was abandoned at 15,266 feet in Permian sediments. With approximately 900 feet nearing the top of Permian deposits, the Whicher Range had a well-defined domain closure. Again, the intervals used in testing for the well's formation were done at the intervals of 12.958-14017 feet. Despite the acidification and fracturing of this well, no amount of effort resulted in an improvement in gas production.

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The drilling of the Whicher Range No. 1 took place in the Southern part of the Perth Basin. It borders the nearest well, which is West Australian Petroleum. After reaching the basement of 10,021 feet, the well drilling of this well was terminated. Initially, Whicher Ranger well was programmed to reach 15000 feet in testing the sections of Jurassic and Permian, both of which had a terminal in the upper part extended to 15,266 feet. This well remains the deepest ever drilled in Australia.

Well History

The operational name of Whicher Range is Union Development and Oil Corporation. Its address is 3601 Tower Building, Australia Square, SYDNEY. The name and the address of the tenant holders are the West Australian Petroleum Pty. Limited, 22 St. George Terrace PERTH. The details for the petroleum tenement are the Permit to Explore 261H License to Prospect 198H. The commencement date is on 19th March 1968, while the drilling was completed on 23rd July 1968. However, the abandonment and the release date for the rig are 22nd September 1968 for the two actions.

Water Supply

In the attempts to reach the surface water in the Whicher Range, there was the drilling of two wells. Approximately the wells were 1500 feet. Since the water in these holes was not enough, the attainment of the water surface in the well took place by a truck hauling from a distance of about 4 miles away. Water was then pumped into the site through the installed pump and installed a polythene pipeline.

Logging and Testing

There was the collection of ditched logged samples at intervals of 10 feet to the total depth from the surface. After the drying of samples, they were forwarded to Core Laboratories and Mill Streets, where they were prepared for the geological survey.


The cutting of twenty-six conventional cores took place at 1846 feet and 13813 feet. The recovery of the core was at 84% with 383 feet core cut recovering 285' 4'' of the required core. Again, the slabbed were also forwarded to the laboratory.

Sidewall Core

At the interval of 2585- 15, 199' there were the attempts of sidewall cores totaling 112. The active cores were eighty-six, which revealed information about hydrocarbon shows. The unused cores in the analysis were also sent to the Bureau of Mineral Resources.

Composite Well Log

This enclosure includes the bit records, the drilling rates, deviation of holes, depths of casting strings, formation tests, stratigraphic units, gas chromatograph, and hot-wire gas reading.

Formation Tests

Through the perforations in the 7" liner, there was the testing of ten drill stem. From the tests, there was a collection of six samples of natural gas at different intervals. From the provided results, the gas has a composition of approximately 92% of methane gas, 4.4% ethane, and a higher structure of homologs at 3.2%, and the last component being nitrogen at 0.4%.


Geological - In the Southern part of South Perth, there are outcrops restricted by sedimentary Quaternary sediments. At the shallow depths of bows and shells, lies the lower end of the Bunbury that occurs along the south coast but within the undercover. There are several publications that provide information about geology, as evidenced by the research.

Geophysical - In 1957, the B.M.R conducted an aeromagnetic survey. Together with the West Australian Petroleum, the B.M.R conducted different studies on gravity and presented their results in 1956 and 1963, respectively. Also, B.M.R has successfully conducted seismic surveys. The combination of reviews from both Sabina and Margaret River formed the necessary foundation for the formation of Whicher Ranger No.1.

Drilling - The existence of wells such as Sue No. 1 forms one of the exploratory wells in the past. Sue No. 1 well and the Alexander Bridge were drilled to the depth of 10 097' and 2 513' respectively. The two wells are located on the thin shelf of the western basin, with some of the sediments expected to exist in those areas.

Regional Geology

The western side of the Whicher Range is the bounding of the deep graben and the Dunsborough and also the more substantial Darling fault to the eastern side. The drilling of the Sue No.1 took place at the shallow lower end to match with the shelf areas along the westwards. Again, there are missing areas of Triassic sediments to the reduced section of the shelved area within the Sue No.1 area. Based on the available information, the shelf sections are not within the marine facies and section dating.


An accurate correlation of the information about the Whicher Range No.1 is not possible due to a lack of knowledge. However, the use of Perth Basins and tentative units it is possible to distinguish different lithologies relating to the correlation of the facts about the existence of the Whicher Range. Also, this finding shows the formation of the Perth Basin in other areas. Most importantly, it is possible to determine the ages of these sites with sufficient shreds of evidence of palynology.

Quaternary (18'-50')

Consists of light grey fine and soft particles of clay matrix. Also, there exist components of freshwater deposits through the reddish-brown sandy deposits.

Unit A: Lower Cretaceous (50'-321')

Consist of medium grey siltstones, soft coals, and carbonated light grey minor particles. In the absence of paleontological evidence, the researchers use the lower cretaceous age.

Unit B: Upper Jurassic (321'- 3,075')

The region has both light and yellowish-grey medium-grain granular sandstone of clay matrix deposits and feldspar, which are very porous.

Unit C: Lower Jurassic (3,075' - 7,366')

This unit has a similar composition as Unit B except for the fact that it has traces of pyrite. However, it does not have spores that can be identified.

Unit D: Lower Triassic (7,366'-12,030')

This unit has grey particles with varying quantities of coarse-grained sandstone. It also contains traces of well-consolidated granules and quartzose that has components of feldspar and even the porous streaks of sands. The identification of this age took place through the determination of its palynology.

Unit E: Lower Triassic (12, 030' - 12, 846')

This unit has a composition of interbedded sandstone with shales. The sandstone is light grey with specks of orange and also medium to coarse grains and the granules. The lower Triassic unit may have a representation of the southern sandier extension, which may be part of Kockatea Shale.

Unit F: Upper Permian (12,846' - 15, 266')

This unit uses coal sequences to measure the components of the minor shale and sandstones within the larger areas of coal deposits. It also has traces of granules and quartz ones.


This wide measure range of dips and strikes with the majority of these factors ranging from 0-20'. Based on the inspection, there exist plane dips due to the effects of cross-bedding.

Relevance to the Occurrence of Petroleum

The occurrence of significant gas took place from 12,960'. However, the most anticipated event of the gas zones took place between 13,610' and 13,870', leading to the detection of new hydrocarbon components.

Porosity and Permeability

This measurement was conducted by the Core Laboratories using the intervals of 12, 962' feet to 13,809' feet. Throughout these intervals, porosity and permeability are very poor.

Contributions to Geological Knowledge Resulting from Drilling Whicher Range No. 1 Well

The only two wells that penetrated the Permian section are the Whicher Ranger and the Sue No. 1 wells. At 15001 feet, Pinjarra No.1 well was terminated. Based on palynological data, it was possible to correlate the information about Whicher Range well. Also, there is an assumption that the Lower Permian deposit is highly concentrated in the Sue No.1 well. Due to the production of gas of up to 1.93 MMCFD, shows that this section of the Perth Basin has a potential of producing industrial gas. However, with the structural location of permeable sediments, the production of the gas can improve.

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