Abstract

Step change in drilling effiency to enhance drilling performance in our field.

Our casing design in our field heavy casing design as drill 22″ hole and set 18.5/8″ casing at +/- 2000 ft and drill this phase with RSS to control the verticalitly in the hole as our wells drilled in cluster location the separation between each wells is 10 M only so the verticalitly is very important to avoid anti collsions between the wellsso 1st phase the quality to drill the hole and run casing is very important than make perfroamnce.

Second phace in our casing design is 16″ phase which will drill it deviated section up to +/- 9000 ftand will discuss it in detail after complete discsions the remain phases in our casing design.

Step change in drilling effiency to enhance drilling performance in our field.

Our casing design in our field heavy casing design as drill 22″ hole and set 18.5/8″ casing at +/- 2000 ft and drill this phase with RSS to control the verticalitly in the hole as our wells drilled in cluster location the separation between each wells is 10 M only so the verticalitly is very important to avoid anti collsions between the wellsso 1st phase the quality to drill the hole and run casing is very important than make perfroamnce.

Second phace in our casing design is 16″ phase which will drill it deviated section up to +/- 9000 ftand will discuss it in detail after complete discsions the remain phases in our casing design.

Third phase is to drill 12.1/4″ hole @ 60 deg. Slanted to +/- 15000 ft (the section length betweem 5000 ft and 6000 ft either will be slanted at 60 deg. Or some time in dep wells build from 30 deg to 60 deg. Based on the departure of the wells.which we improve the performance in this phase by utilizing motorize RSS compare to RSS before which over come the high torque and enhance performance of the section and our average now reached to 60 ft/hrs and still we work in it to able to reach to our stretch target of 80 ft/hrs which we achieved it in some wells then run and cement 9.5/8″ casing in onr stage without any problem and this section new drill it with Oil base mud 95 PCF mud wt to over ocme the shale problem across halul and Laffan formation plus Nahe UMR shale and set 9.5/8″ casing in 50 ft into Bab MBR above our reservoir.

Then we drill 8.1/2″ short section to land our wells across our target zone in the reservoie this section not so long +/- 1500 ft and drill it with RSS with average ROP 50 ft/hrs our landing point in our wells in range from 3000 ft departure and reach in majority of our wells to 12000 ft departure at landing point and landing point measure depth reach to 16000 ft measure depth, then run and cement 7″ liner.

Then we drill 6″ H.H which our hole length is 4000 ft drill it with motorize RSS to over come the stick and slip which enhance our ROP to reach 70 ft /hrs average ROP and 150 ROP in BTM rop which give us big chance to enhance our ROP in section by work with the drilling crew to enhance norm data for the connection time and tripping time as due to the big expension in our company we have drilling crew have less experience which by timeand train the crew the performance will able to enahce it and maximize ROP in this section after that, we L/D all the pipe run cement bond log and run completion either oil producer completion or wag completions.

From the above Back ground for our well casing design we able to manage the performance in all the phases and achieve our expect ROP only the challenge phase to us was 17.1/2″ /16″ phase in our casing design so we work with all the vendor to make different trials in this section to achieve our target to drill the section in one run with good ROP.

We start our project in this field in 2003 by drilling +/- 80 wells up to 2006 during this period this section drill as 17.1/2″ hole in two trips some time if we have motor failure or bit falure compelte the section in three trips with average ROP between 25 ft/hrs max. achieve was 30 ft/hrs which consume from our well duration more than 15 days including two trips in between So we start with 1st change in this phase to drill it with 16″ hole instead off 17.1/2″ hole which enhance the rop by +/- 10 % improvement but still to low compare to our expectations so seond trials for this sectionto use PDCand motor to drill the section in one trip and build the well angle up to 60 deg. Inclination but due to aggrasive of PDC we found we have a lot of hanging problemmand not able to acieve require dog leg and we forced to POOH and Run with rock bit 445 bit and compelte section with two run again which prove to us motor assy and PDC bitwill ehance performance only in vertical or slanted hole but in the build up section will not give us our expectation for the performance require from this section.

So we start call the vendor again especially we will start in second phase from our project which we will drill+/- 200 wells from same design and the performance of the section still not as per our expecations so we get different proposal from different vendors and start try all the proposal one by one.

1st we tried to run with RSS and PDC SIX plate and nighnteen MM cutter we able to achieve require build up rate but still the achieved ROP less than our requiremtns which we aim to acieve it in this section. So another company came and propse to us to go with RSS and Rock bit which also we achieve require build up rate but still not able to achieve good performance from drillability point of you as the rop still in range of 33 ft/hrs which improve by 10 % only so we cont. discuss the subject section to to achieve our aim of good ROP as this time we looking to acieve 40 FT/Hrs which never done So we get proposal to use motorize RSS instead off RSS only with same PDC bit and finaaly we able to enhance ROP in the section as we drill in the 1st well with motorize RSS +/- 5000 FT in one run and achieved 41.2 FT/HRS then in cont. to use Motorize RSS and our avarge ROP enhanced from 30 ft/hrs up to 40 ft /hrs So far this achievement done in four wells with one vendor only and second vendor did two trials but still they have Issue with build up rate and currnently we work with them to check the good bit selection to able to repeat the achievement which done with the 1st vendor and same time another two vwndors study our data and BHA to get in and make one trial per each to have all the vendorsc work with us in this section to have good competations between all the vendors who work with our team in our company as we have all the directional company work with us as we have in our company so far more than 40 rigs 8 our of this 40 rigs work in our project which we shouls complete in the 1st batch of this phase more than 120 wells of same design So far we complete 30 wells only So looking to enhance the performance in this section which we able to achieve so far minmum of 5 days per well.

So up to now we start in change number of Drill collars and number of heavy weight to minimize torque and drag which had direct factor for enhance ROP and up to this moment we achieved record ROP in last section which we drilled 6800 ft start from 2000 ft measure depth and reachto casing point at 8800 ft and achieved 45.3 FT /HRS which enhance performance in the section by more than 50 % improvement by minimize number of drill collers to only four drill collars and only eleven heavt weight drill pipe able to minimize torque and enhance ROP as mention above to 45.3 ft/hrs which saved +/- 5 days in the last wells and by complete this well ahead in 13.3/8″ casing we able to complete the same well up to T.D and run completiuon in total of 55 days compare to 65 days plan as achived target of the well saved 10 days from the well plan and compare to another wells similar departure which T.D +/- 19500 ft we drill it almost in 70 days which show to us How much imrove in this well compare to the similar wells as if we start the well ahead which happen in recent wells we finiosh 13.3/8″ phase ahead by 5 days we able to finish the well ahead by 10 days.

So what we achieved so far in the 16″ phase excellent acheivmeent which we looking for it since many years as we have good step in the drilling effiency by utilizing the recent new technology of using motorize RSS and the last version of PDC to able to achieve ecxellent performance of drilling this section which we phase a lot of difficulty in different wells until reach to the 1st step of enhance the performance by utilizing new technology and enhance ROP as mentioned above.

What we gain in this phase so far.

  1. Enhance ROP in the 16.″ Section by more than 50 %.

  2. Achieved good quality hole as we drill with rotory assy all the tiem no slide.

  3. Exellent hole cleaning and less torque.

  4. Less waste out from this type of wells as we drill 16 hole compare to 17 hole as our area has enivernoment impact as we drill as mention before in restricted area in natural island or new build small island inside the sea which we have logstic issue to trasfar the waste.

  5. Running casing smooth to BTM due to drill quality hole no slide all the hole drill it with rotory and no high dog leg.

  6. Good cementation for 13.3/8″ casing.

  7. Enhmace well duration with 15% reductions.

After able to make good performance in 16″ hole while keep work in enhance the performance and increase ROP we start looking to another factor of casing design to see for some type of trajectory which we can change casing design to have slim casing design and from this point we divide our wells trajectory to three type of wells.

First type of wells which we have departure between 6000 ft and more up to 12000 ft and this type of trajectory will cont. same design which I explained it above and will work in enhance the perforamcne as mention above in each phase and so far we are doing very good in enhancing the ROP and well duration.

Second our wells which we have the departure at landing point less than 2000 ft we make MOC and change casing design for this type of wells to be light casing dersign as we drill the wells as following, we start our wells to drill 16″ hole to 2000 ft then run 13.3/8″ casing, then drill 12.1/4″ hole vertical to 7500 ft and run 9.5/8″ casing then drill 8.1/2″ hole to laning point and run 7″ liner +/- 11000 ft then drill 6″ H.H 4000 ft by utilizing this light casing design in this type of wells we able to complete four wells from this type of trajectory with average well duration off 40 days while if we drill it same casing design for the long departure ERD wells it will take not less than 48 up to 50 days.

For thl ight casing design above we able to save 20 % from the total well duration compare to heavy casing design wells without any other work in utilizing any new technology in 8.1/2″ hole which we drill 3500 ft in this section by utilizing motorize RSS we able to manage and acived rop up to 50 FT/HRS compare to our average of 40 ft/hrs which enhance drillability by more than 20 % in this sections .and same as well in 6″ H.H we cont. drill with motorize RSS with average of ROP more than 60 ft/hrs ans aiming to achieve 70 ft/hrs by working with the crew in enhance connection time and minimize wash and ream each stand and minimize survet time by utilizing inclination at bit with contnous reading which will give us chance to take survey each stand and some time each two stand which will save a lot especially if you see different between ON BTM ROP and average ROP as our average ROP is 60 ft /hrs while our on BTM ROP more than 130 ft/hrs.

Also we have another good practice we start to did it which saved to us each wells +/- pone day per well by pick up all the 4″ pipe which require to drill 6″ hole we pick up all while drill 8.1/2″ hole offline we prepare more than 80 stand ready at derrick to minimize tripping time while RIH with 6″ assy and saved one day per well as well as also we utilizing PC machine to enhance performance to AL/Down all the pipe before running completiuon instead off L/Down it by horse which take long time and enhance L/Down from 12 joint per hrs up to 22 joitns per hrs which over ocme the less comptancy of the crew due to the big expension in our company.

Third type of trajectory which we havedeparture between 3000 ft up to 6000 ft we found we can eliminate 8.1/2″ section by drilling 12.1///4″ hole to landing point direct in the reservoir instead off set it at top of reservoir then run 9.5/8″ casing to landing point and drill 8.1/2″ H.H instead off 6″ H.H so the different between this design and first design we just eliminate short section oh 8.1/2″ deviated hole to landing point and extend 12.1/4″ hole to landing point so we saved all the flaste time of POOH off 8.1/2″ assy run liner and cment same which saved in each well +/- 6 days and $ 720,000.

So the conclusion from the above we make three steps to enhance our performance and make step change in our drilling effiency.

  1. First steps utizing motorize RSS in 16″ hole with PDC bit which able to enhance performance by more than 50% and saved +/- 5 days per well plus to the hole quality and decrease the torque while drilling and minimize chance of stuck by minimize torque and also due to decrease number of drill collars in the string and no slid due to using motorize RSS.

  2. Modified heavy casing design which saved to us +/- 6 days per well due to eliminate drilling 8 ½ deviated hole and run 7″ liner and drill 8.1/2″ H.,H instead off 6″ hole.

  3. Third step change which we did it in our team to enhance drilling effiency use light casing design in less departure trajectory which maname us to drill the well in duration less than 40 days just due to minimize one casing phase and still we will able to challenge this duration by working with crew competency to reach our stretch target and drill this type of wells in 30 days.

  4. Make 4″ pipe offline while drill 8.1/2″ section saved to us in each well 1 day.

From all the above by utilizing new technology and used different scheme of casing design as mention above we categorize our project for each well we looking to the trajectory in advance more than six months before drill the well and decide what type of casing design will drill it from the three catogery as mention above and based on each catogery, engineer of the assigned rig work with his team on rig site to enhance the performance by utilizing different new technology available in the market to enhance the performance of ROP which lead to enhance the well durations and contnous improvement in our project to able to complete the project in due time as all our wells in Batch I of phase –III must complete it by Q −3 from 2017 to able to produce by end of 2017.

Last point to complete the document as we woprk in project which have different clusters we give each cluster to different directional company to work with their new technology to have good competation between all the directional companies and achieve max. Benfit of performance as we have our clusters from 6 well per cluster up to 30 wells per clusters and make each cluster as small project and make competation between all the service provider to take the maximum from them and enhancement of the drilability in each wells, which clear to every body for each type of wells.

In first cvatogry we manage to enhance total duration of the well from 70 days up to 55 days, and second catogery we manage to enaghnce well duration from 60 days up to 52 days and light casing design we able to achieve so far 36 days per well and cont. with our effort to achieve oue stretch target 30 days per well .plus the main achievement of our succeed in 16″ hole by achieved 50 % improvement in rop and saved +/- 5 days per wells.

This is work for complete team one team leader my self and our drilling engineer in our team thnks for all of them for their contribution in enhanced the performance as well for all service providers who work with us in the project.

All the above challenges done by our team supervision by my self and no any reference from some where else.

This paper was selected for presentation by an SPE/IADC program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed by the Society of Petroleum Engineers or the International Association of Drilling Contractors and are subject to correction by the author(s). The material does not necessarily reflect any position of the Society of Petroleum Engineers or the International Association of Drilling Contractors, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper without the written consent of the Society of Petroleum Engineers or the International Association of Drilling Contractors is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of SPE/IADC copyright.