The FREE global community of drilling, completion & subsea professionals - Gives you access to a wealth of knowledge that you may not otherwise have had http://myspread.co.uk/ en Wed, 22 Feb 2012 23:44:38 +0530 SPREAD http://myspread.co.uk/images/icons/feed-icon.png http://myspread.co.uk/ http://myspread.co.uk/discussion/2216_Well-Control-a-variable-water-injector-reservoir-pressure/ http://myspread.co.uk/discussion/2216_Well-Control-a-variable-water-injector-reservoir-pressure/ Tue, 21 Feb 2012 06:37:05 GMT Number of responses : 3
Last reply received on 22-Feb-2012 at 02:34 PM]]> Hi forum, I am planning workover a water injector well which in the previous workover experienced reservoir pressure fluctuations that leads to change the hydrostatic fluid weight to control it (from 85 pcf to 130 pcf mud weight). Looks like there are low and high permeabilities across the horizontal reservoir zone and some times there are fluid losses and then the well kick off. Do you have recommendations to handle this well conditions over the workover operation?
Thanks
John Correa ]]> http://myspread.co.uk/discussion/2212_Drilling-w-Landing-String/ http://myspread.co.uk/discussion/2212_Drilling-w-Landing-String/ Sat, 18 Feb 2012 09:27:10 GMT Number of responses : 3
Last reply received on 20-Feb-2012 at 04:50 PM]]> We are considering whether to use the Landing String as part of the drilling string. Is this a common practice? A full string of 6-5/8" DP should mitigate some downhole vibrations that operators have/are experienced in the area (this is a separate discussion). Would prefer to have dedicated 6-5/8" LS, but finger board can't rack a dedicated LS and a separate drillstring of 6-5/8" DP.

Plan would be to run 0.522" WT DP below 0.625" WT LS. Some of my questions include the following:
- Do you "de-rate" the LS? How much? It's inspected to 95% RBW
- Recommended inspection frequency of the LS if used for drilling?
- Key Risks to consider? BOP's will shear 0.522" WT DP.
- Key Risk Mitigations to be successful drilling w/ the LS.
- Do you adjust anything in the slip crush calculation? ]]> http://myspread.co.uk/discussion/2205_Displacement-fluid/ http://myspread.co.uk/discussion/2205_Displacement-fluid/ Sun, 12 Feb 2012 00:27:43 GMT Number of responses : 3
Last reply received on 15-Feb-2012 at 12:44 PM]]> We have been having some discussion about what fluid it's best to displace with on cement jobs with WBM in the hole. For casing pressure tests it is common to treat water as incompressible, although this is not strictly true. Does anybody have any insight into the compressibility effects that mud chemicals (non hydrocarbon based) and drill solids have? Do these reduce the compressibility, increase it or have a neutral effect? ]]> http://myspread.co.uk/discussion/2196_Mud-mixing-procedures-on-the-rig/ http://myspread.co.uk/discussion/2196_Mud-mixing-procedures-on-the-rig/ Fri, 10 Feb 2012 05:17:56 GMT Number of responses : 4
Last reply received on 14-Feb-2012 at 02:41 PM]]> Please debate the following statement;

Mixing in the active tank is a shoody practice that should be discouraged. ]]> http://myspread.co.uk/discussion/2192_Temperature-Effects-On-CaBr-Brines/ http://myspread.co.uk/discussion/2192_Temperature-Effects-On-CaBr-Brines/ Thu, 9 Feb 2012 09:16:12 GMT Number of responses : 7
Last reply received on 13-Feb-2012 at 04:23 AM]]> I am looking for feedback on possible weight loss of CaBr due to low tempertures in the pits. Temperatures here in the Danish North Sea have been as low as -15C for a prolonged period, circ 3 weeks and the density of the brine measured has dropped from 13.8ppg to 12.5ppg. Looking at the usual temperature charts for these Brines shows it is stable over varying temperatures. Contamination is obviously the first point of investigation, this so far does not seem to be the issue. Could these lower temperatures have such large effects on weight? ]]> http://myspread.co.uk/discussion/2175_Severe-Vibration-Drilling-Top-Hole/ http://myspread.co.uk/discussion/2175_Severe-Vibration-Drilling-Top-Hole/ Tue, 7 Feb 2012 04:46:50 GMT Number of responses : 15
Last reply received on 10-Feb-2012 at 10:45 PM]]> While using a BHA with a 9.62m560XP Motor with a 1.5 Deg Bend.

Drilling Perameters: surface to 500 Ft: Bit 16", TFA .9In2, WOB 35-40 Klbs, Srrface RPM 40-60,Total Bit RPM 160-180, GPM 900-950, SPP, 1000-2000 Psi> While drilling this section drilling contractor is expieriencing severe surface vibration which in turn is causing problems to the top driveand other equipment in the mast. Has anyone ever expierienced this problem and how was it mitigated.

Thanks
Lyle Hopkins
Tesco ]]> http://myspread.co.uk/discussion/2033_Hydril-annular-element/ http://myspread.co.uk/discussion/2033_Hydril-annular-element/ Thu, 10 Nov 2011 14:45:23 GMT Number of responses : 7
Last reply received on 08-Feb-2012 at 06:25 PM]]> Can anyone tell me the recommended amount of times an annular can be closed. And what would be the storage life of a Hydril annular element. We have just experienced a failure after 50 closures with our annular. ]]> http://myspread.co.uk/discussion/2162_Close-tolerance-between-casing-tubing/ http://myspread.co.uk/discussion/2162_Close-tolerance-between-casing-tubing/ Fri, 3 Feb 2012 11:50:52 GMT Number of responses : 6
Last reply received on 07-Feb-2012 at 04:04 AM]]> Folks, maybe you can help me with this. We have had tubing sizing work done which specifies 7" completion tubing for our water injector wells and one of our oil producers.
I know we can get slim SSSV with control line feed through capability and in our case we will have in addition to the control line for the SSSV, lines for downhole gauge and chemical injection.
Other relevant facts - the oil producer will be gas lifted at some point (mandrel clearance?) and these are directional wells, building to horizontal with 3-4 deg doglegs. Coupling Vam Top.
Does anyone have experience of running a 7” completion similar to this inside 9 5/8”47# casing, or should we be looking at lighter weight 9 5/8" or 10 3/4" for example?. I suspect the answer is yes but would welcome any thoughts.

thanks,
Dave Buckley ]]> http://myspread.co.uk/discussion/1952_Drill-pipe-screens-for-XT-54-pipe/ http://myspread.co.uk/discussion/1952_Drill-pipe-screens-for-XT-54-pipe/ Wed, 28 Sep 2011 08:56:18 GMT Number of responses : 3
Last reply received on 04-Feb-2012 at 04:28 AM]]> We're using 5-1/2" XT-54 drill pipe on our rigs in Kazakhstan, and over the last couple of years have had a two instances of large amounts of debris getting into - and completely plugging - the MWD/LWD tools, having bypassed all the suction and discharge screens on the mud pumps. We do not want to modify the pipe to accommodate a screen (also not recommended by Grant Prideco), so the only options are either to modify the saver sub or to install an extra sub with a screen between the drillpipe and the saver sub. This, however, is not so easy to break out and inspect on a regular basis. Does anyone have any experience of similar problems and possible solutions?

Thanks,
Tim Harrison ]]> http://myspread.co.uk/discussion/2163_Cementing-5-liner-in-6-hole/ http://myspread.co.uk/discussion/2163_Cementing-5-liner-in-6-hole/ Fri, 3 Feb 2012 12:45:51 GMT Number of responses : 4
Last reply received on 03-Feb-2012 at 03:33 PM]]> Hi everyone,
I would be interested to find our any global experience of cementing 5" liners, especially inside of 6" holes.

On the number of recent wells, we had to run 5" (contingency) liner and cement them inside 6" hole.

Cement bond logs on all that wells indicated pore cement quality (channelling, mud pockets). From cement job designing we don’t see any obvious problems (plenty of centralisation; adequate amount of spacer; on one job we used sacrificial lead slurry).
The cement job execution didn’t go as text book but were not that wrong to suggest that entire cement job would be bad.

We are wondering if 5” liner by 6” hole is a bad combination. May be we should run smaller liner or drill (underream) bigger hole.

Really appreciate if anyone can share the thoughts or real experience with cementing small size liners in small hole sizes (5” liners inside of 6”hole, or other combination). ]]> http://myspread.co.uk/discussion/1995_Reamers-in-cement-drill-out-BHA/ http://myspread.co.uk/discussion/1995_Reamers-in-cement-drill-out-BHA/ Thu, 20 Oct 2011 21:34:03 GMT Number of responses : 2
Last reply received on 02-Feb-2012 at 04:30 PM]]> Is it OK to run roller reamers in a BHA to drill out cement (bearing in mind the reamers will be rattling around inside the casing).? ]]> http://myspread.co.uk/discussion/2157_Expectations-Workshops-PNG/ http://myspread.co.uk/discussion/2157_Expectations-Workshops-PNG/ Tue, 31 Jan 2012 19:51:17 GMT Number of responses : 0]]> In early January, Dave Taylor spent a few days in the Highlands of PNG to facilitate 2 x Expectations workshops at High Arctic Rig 104. After a series of performance scene-setting discussions in the pre and post-tour meetings in the smoko shack, the rig was shut down for 2 hours per shift to lay out the work programme and then break into groups to discuss our expectations from each other : Rig crew from their Supv; Supv from their crew; Oil Co from Drilling Co & Service Co; Drilling Co from Oil Co & Service Co; Service Co from others .. oh, and so embarrassing of all, what we liked about each other.

Too touchy-feely for you ? .. I just read (from Christine Lafarge, the new IMF leader) that it is sometimes necessary to "waste" time upfront to achieve consensus (and get the team motivated) than waste a lot more time later on when they are not.

Many people made the event(s) possible, but I would like to make special mention to both of the HSE Advisors at HAES, whose translation skills and enthusiasm helped engage the nationals : Jaeboy James and John Tumun .. tenkyu tru lads.

Folks .. it's never too late to make a difference.

Dave Taylor
(dave@relentlesspursuit.co.uk) ]]> http://myspread.co.uk/discussion/2142_Chemical-injection-line-drainage/ http://myspread.co.uk/discussion/2142_Chemical-injection-line-drainage/ Fri, 20 Jan 2012 15:22:59 GMT Number of responses : 3
Last reply received on 26-Jan-2012 at 05:10 PM]]> During a RFI one of the vendors we are looking at for supplying chemical injection valves brought up an interesting scenario.
They mentioned the possibility of drainage in the chemical injection line and the consequent potential for “boiling” of chemicals and crystals plugging the injection line.
Their explanation for the drainage is that with the increased draw down with the ESP pumps there is potential for the pressure at the mandrel (in the control line) to be higher than the tubing pressure at depth, therefore allowing draining and boiling to occur.

Have any of the member ever heard/have experience of this scenario or control line blockages due to chemicals?
Thanks ]]> http://myspread.co.uk/discussion/2145_Conn-torque-and-dope-preference-in-H2S-wells/ http://myspread.co.uk/discussion/2145_Conn-torque-and-dope-preference-in-H2S-wells/ Mon, 23 Jan 2012 15:22:07 GMT Number of responses : 9
Last reply received on 26-Jan-2012 at 03:04 PM]]> When drilling in a high Hydrogen Sulphide Environment much is documented about the effects on elastomers and steels.
However what is the effect on the make up torque of tubulars - should it be modified somewhat?
Similarly, what is the best pipe and collar connection dope for this environment? ]]> http://myspread.co.uk/discussion/2140_FIT-LOT-XLOT-in-deepwater-enviornments/ http://myspread.co.uk/discussion/2140_FIT-LOT-XLOT-in-deepwater-enviornments/ Fri, 13 Jan 2012 05:25:13 GMT Number of responses : 1
Last reply received on 15-Jan-2012 at 06:25 PM]]> What best practices or lessons learned are being applied in deepwater regarding formation integrity tests being conducted.

Notable at surface and intermediate casing shoes.

Is extending the test to a XLOT beneficial and how is this data then being used to add value to future well(s) developments. ]]>