{"id":12862,"date":"2022-11-27T11:19:03","date_gmt":"2022-11-27T11:19:03","guid":{"rendered":"https:\/\/www.oilnewskenya.com\/?p=12862"},"modified":"2022-11-27T11:19:03","modified_gmt":"2022-11-27T11:19:03","slug":"zimbabwe-mukuyu-1-to-be-sidetracked-as-borehole-conditions-deteriorate","status":"publish","type":"post","link":"https:\/\/www.oilnewskenya.com\/index.php\/zimbabwe-mukuyu-1-to-be-sidetracked-as-borehole-conditions-deteriorate\/","title":{"rendered":"ZIMBABWE: Mukuyu-1 to be Sidetracked as Borehole Conditions Deteriorate"},"content":{"rendered":"

\u2022 Mukuyu-1 successfully deepened to 3,923 metres Measured Depth (\u201cmMD\u201d),
\nencountering additional elevated gas shows and fluorescence through to total depth
\n\u2022 Results prove up potential of the Upper Angwa formation over a 900m gross interval
\n\u2022 Upper Angwa formation thicker than pre-drill estimates, boding well for future
\nprospectivity in the Cabora Bassa Basin
\n\u2022 Mukuyu-1 to be sidetracked to complete evaluation
\n\u2022 Shareholder briefing to discuss preliminary well results and forward operations
\n.
\nComments from Managing Director Scott Macmillan:
\n\u201cThe existing Mukuyu-1 wellbore was successfully deepened to 3,923mMD and continued to encounter multiple reservoir units with elevated gas shows and fluorescence until total depth (TD), proving up the potential of the Upper Angwa formation over a 900m gross interval.<\/em>
\n\u201cOur primary Upper Angwa target formation is thicker than anticipated from pre-drill estimates, which bodes well for future prospectivity in the basin.<\/em>
\n\u201cAfter reaching TD, the borehole was prepared to run wireline logs, however, due to a <\/em>deterioration in borehole conditions, the tools were unable to pass below a depth of<\/em>
\napproximately 3,030mMD where the primary fluid sampling targets are located.<\/em>
\n\u201cCurrent borehole conditions make logging the existing hole section extremely risky with an increased likelihood of losing tools and not meeting the objectives of the well.<\/em>
\n\u201cAs a result, the decision has been made to sidetrack^ the Mukuyu-1 well in order to complete our evaluation and obtain a fluid sample.\u00a0<\/em><\/p>\n

\u201cResults to date have been extremely encouraging and we plan to suspend the sidetrack well for future testing.<\/em>
\n\u201cWe anticipate the remaining activities will require a further 12 to 18 days and we look forward to providing further updates in coming weeks.\u201d<\/em><\/p>\n

^Sidetracking is a regularly used oilfield practice where a secondary wellbore is drilled away from the original wellbore to bypass an unusable section of the well or explore a geological feature nearby. In the bypass case, the secondary wellbore is usually drilled substantially parallel to the original well. Mukuyu-1 ST-1 planned well path is shown below in Figure 1.<\/p>\n

\"\"<\/p>\n

Progress and current operations<\/strong>
\nSince the last update, the Mukuyu-1 well was successfully deepened to 3,923mMD where TD was called.
\nThe well encountered additional reservoir zones displaying elevated gas shows and
\nfluorescence to TD.<\/p>\n

This proves up the potential over an approximately 900m gross interval within the Upper
\nAngwa, which is thicker than pre-drill estimates.<\/p>\n

Following TD, the borehole was prepared for wireline logging, however the logging tools were unable to pass beyond a depth of 3,030mMD following several attempts. In addition, substantial amounts of overpull were required to free the tool from several points along the wellbore which is typically indicative of wellbore instability\/breakdown.<\/p>\n

Analysis shows borehole conditions have deteriorated over the last few days while waiting for the wireline formation testing tool to arrive. Further attempts to log the existing hole section is deemed to carry elevated risk of losing wireline tools and not fulfilling the objectives of the evaluation program to obtain a fluid sample.<\/p>\n

Deterioration is likely due to heavy water-based mud utilised as a precaution during drilling,\u00a0\u00a0previous remedial action taken to stem the losses experienced in the Pebbly Arkose formation and the substantial length of time the current 8\u00bd\u201d hole section has been open, which now exceeds 25 days.<\/p>\n

An assessment determined plugging back the existing 8\u00bd\u201d wellbore section and conducting a sidetrack from the 9\u215d\u201d casing shoe (at approximately 2,020mMD) would provide the Company the best opportunity of acquiring a valid fluid sample and the ability to suspend the well for future flow testing.<\/p>\n

Forward plan<\/strong>
\nExalo Rig 202 is preparing to plug back the existing 8\u00bd\u201d wellbore section to seal off
\nhydrocarbon zones and leave the well in a safe state prior to and commencing the re-drill of the upper 8\u00bd\u201d hole section to approximately 3,500mMD. This will provide sufficient
\ninformation to calibrate the deeper sections of the original Mukuyu-1 wellbore.<\/p>\n

The sidetrack well (Mukuyu-1 ST-1) will be drilled to a slight updip location to the north of Mukuyu-1, with a lower mud weight and solids content mud system (approximately 1,500psi reduction in overbalance), which will improve the logging conditions and chances of successfully obtaining a fluid sample.<\/p>\n

Following conclusion of sidetrack drilling, the well will be logged, including wireline formation testing, with final results to be provided.<\/p>\n

The Mukuyu-1 ST-1 well will then be suspended for potential future testing.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u2022 Mukuyu-1 successfully deepened to 3,923 metres Measured Depth (\u201cmMD\u201d), encountering additional elevated gas shows and fluorescence through to total depth \u2022 Results prove up potential of the Upper Angwa … Read More<\/a><\/p>\n","protected":false},"author":24,"featured_media":12690,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[7442,7445,11],"tags":[9258,10170,7812,10413,10833,10832,2767],"class_list":["post-12862","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-countries","category-southern-africa","category-top-news","tag-cabora-bassa-basin","tag-exalo-rig-202","tag-invictus-energy","tag-mukuyu-1","tag-mukuyu-1-st-1","tag-sg-4571-licence","tag-zimbabwe","entry"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.oilnewskenya.com\/wp-content\/uploads\/2022\/09\/Zimbabwe-Baobab-1.png?fit=614%2C393&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p5JWkQ-3ls","jetpack-related-posts":[{"id":13183,"url":"https:\/\/www.oilnewskenya.com\/index.php\/zimbabwe-mukuyu-1-evaluation-update-operations-completed-phase-2-campaign-planning-commenced\/","url_meta":{"origin":12862,"position":0},"title":"ZIMBABWE: Mukuyu-1 Evaluation Update, Operations Completed & Phase 2 Campaign Planning Commenced","author":"","date":"January 23, 2023","format":false,"excerpt":"HIGHLIGHTS \u2022 Mukuyu-1 ST1 identifies 13 potential hydrocarbon bearing zones \u2022 Combined 225m gross potential hydrocarbon bearing zones identified in primary Upper Angwa target \u2022 Mukuyu-1 ST1 operations completed \u2022 Rig 202 is rigged down in preparation for maintenance and upgrades \u2022 Planning commenced for Mukuyu appraisal & Phase 2\u2026","rel":"","context":"In "Countries"","block_context":{"text":"Countries","link":"https:\/\/www.oilnewskenya.com\/index.php\/category\/countries\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.oilnewskenya.com\/wp-content\/uploads\/2023\/01\/Mukuyu-1.png?fit=615%2C331&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.oilnewskenya.com\/wp-content\/uploads\/2023\/01\/Mukuyu-1.png?fit=615%2C331&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.oilnewskenya.com\/wp-content\/uploads\/2023\/01\/Mukuyu-1.png?fit=615%2C331&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":13818,"url":"https:\/\/www.oilnewskenya.com\/index.php\/zimbabwe-mukuyu-2-appraisal-well-location-selected-ahead-of-spudding-in-q3-2023\/","url_meta":{"origin":12862,"position":1},"title":"ZIMBABWE: Mukuyu-2 Appraisal Well Location Selected Ahead of Spudding in Q3 2023","author":"","date":"July 17, 2023","format":false,"excerpt":"Invictus Energy Limited has provided an update on the Mukuyu-2 appraisal well, a follow up to the successful, play-opening Mukuyu-1 well in the Cabora Bassa Basin in Zimbabwe. 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