BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2050
SUBJECT RUNNING TEST STRING SEMISUBS
REVISION 0
DATE 01/10/92
RUNNING TEST STRING SEMISUBS
1. SAFETY
1.1 A BOP test should have been carried out less than 7 days before commencement of the operation.
1.2 Ensure all equipment to be run is rated for the pressures to which it will be subjected.
1.3 Ensure that any nitrogen to be used in the test tools contains less than 1% Oxygen. Use of off spec Nitrogen could result in the compression ignition of residual
hydrocarbons/hydraulic oils present in the test tools.
1.4 Ensure a stab in valve (Kelly Cock) is on the floor and made up to the correct cross over at all times.
1.5 Check that the tubing diameter is within the operating range of the variable rams.
2.1 Before making up the minor string pick up the flowhead and first joint of landing string and make up same. Layout the flowhead and first joint of landing string on the pipe deck.
Attach the coflexips (if using a coiled tubing lifting frame it is best not to attach coflexips at this point)and paint a white line across the swivel connections. (The making up of the flowhead may already have been done if TCP guns are being run)
2.2 Ensure all downhole tools are certified, that they are pressure tested to psi and that their operation is confirmed on the deck before running in the hole.
2.3 Tools that require a nitrogen precharge should be charged up at least 24 hours before they are due to be run. The charge pressure should be checked several hours before the tools are run.
2.4 Check power output of mud pumps/cement pumps to determine the number of circulation ports to use on the circulating valve. (Only applies to Schlumberger and Baker tools).
2.5 The lengths, drift and connections of all downhole tools are to be checked by the PE/DE.
The drift diameter must be 2.125".
2.6 Have the tubing cleaned, inspected and protected as follows:
a All joints should be measured and clearly painted with a number.
b Each " tubing joint should be drifted from the Box-end to " with a 42" long drift. Check the drift across two diameters at each end and in the middle using callipers.
c Blow through the pipe with compressed air to ensure it is internally clean and dry.
d The connection threads/seal faces should be cleaned with either, a high pressure steam jet followed by an air blast to dry them, or by a high pressure water jet followed by a de-watering solvent eg 'Houghtoclean 500' applied with a soft clean brush.
Diesel or Paraffin should not be used for joint cleaning since, if not fully removed, a lack of lubricant adhesion to thread/seal surfaces can result.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2050
SUBJECT RUNNING TEST STRING SEMISUBS
REVISION 0
DATE 01/10/92
2.7 The drill collars to be run must be drifted to 2.125" and have their threads inspected for signs of wear/damage.
2.8 Have the running equipment checked as follows:
a Power Tongs
Check the torque output of the tongs up to the maximum anticipated for the job.
Check the accuracy of the hydraulic load cell versus the computer torque output.
Check the operation of the dump valve which automatically cuts make up when the required connection torque has been reached.
b Elevators and Slips
Check that the single joint elevators are in good working order and are rated for the maximum anticipated load. Check the condition of the slip dies and perform a trial latch of the elevators on to the tubing before the job starts.
c Stabbing Guide
Check that the stabbing guide fits snugly over the box, extending at least to the inside of the shoulder, in order to prevent the pin seal catching on the box whilst stabbing.
2.9 Prepare a string running order and include details of all equipment lengths, ID's, OD's, thread connections and make up torques. Indicate on the running list when to pressure test and the joints where the tailpipe/packer assembly enters the BOP's and any liner tops.
Note
The packer should be set at least 3m from the nearest casing collar (from CBL/CCL log)
3.1 Run Packer and DST tools, drill collars and slip joints as per attached running list/diagram.
Only dope the pin ends of the test string joints sparingly with either a 2" paint brush or a spray dope applicator. The importance of keeping the string I.D. clear cannot be over
3.3 Continue to run the -1/2" tubing using the computerised joint make-up analyser.
Exercise extreme care when the tailpipe/packer assembly enters the BOP's and any liner tops.
Continue to fill string with seawater.
Inform the BP PE/DE/REP of any joints that fail to make up or are rejected for any other reason. Lay out rejected joints and mark with red paint.
3.4 Pressure test the string to 300 psig for 5 minutes and psi for 10 minutes after running joint .
3.5 Run the remainder of the -1/2" tubing using the computerised joint make-up analyser.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2050
SUBJECT RUNNING TEST STRING SEMISUBS
REVISION 0
DATE 01/10/92
3.7 Pick up and run the fluted hanger and slick joint. Denzo tape or paint the slick joint with white paint. RIH joints to of drill pipe and land out the fluted hangar in the wear bushing.
Do not fill the drill pipe with seawater.
3.8 Rig up wireline and compensate as per open hole logging. Run GR/CCL correlation log to locate RA markers in test string and casing.
3.9 Rig down wireline, close then open the middle pipe rams and pull back the landing string.
Adjust the tubing spaceout as required taking into consideration the stroke of the slip joints, jars, hydrostatic reference tool and packer.
4.1 If TCP guns are not being run then delete item 3.0 from the operating procedure.
4.2 Read section 2900 of the Drilling Manual. This has more detailed procedures for preparing the tubing and the tubing running equipment.
4.3 Discuss the maximum running speed per joint with the TCP and Downhole Tools Engineers.
4.4 If running a Halliburton TST valve the string will be self filling and will fill with wellbore fluid. The operating procedure should be changed to reflect this. Note that prior to pressure testing against a TST valve it is a good idea to Yo-Yo the string to clean the TST valve's seal faces.
4.5 Under no circumstances should tubulars be handled without having thread protectors installed on the pins. This includes standing back in the derrick.
4.6 Note that the packer should be set at least 3m from the nearest casing collar (from CBL/CCL log).
4.7 If a PLT is to be run the distance from the tail pipe to the top shot should ideally be a minimum of 35 metres.
4.8 Following the gun correlation run, the space out should be proposed by the PE and be verified by two others, eg TCP rep & DE. Spaceouts are not recommended to be calculated by committee.
4.9 In sour or CO2 wells consideration should be given to the use of CB rings (Corrosion barrier) in the tubing box ends to protect the seal areas from corrosion.
4.10 The cementing kelly should not be used for pressure testing the tubing.
4.11 It is more time efficient to run the fluted hanger (step 3.7) on drill pipe than use the landing string tubing. This is because it takes extra time to make up and breakout tubing joints than to make and break drill pipe.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2050
SUBJECT RUNNING TEST STRING SEMISUBS
REVISION 0
DATE 01/10/92
4.12 Running the test string with a permanent packer
If a seal mandrel and permanent packer are being run, the following points must be considered.
a Every run into and out of the permanent packer runs the risk of damaging seals.
b It is possible to pressure lock the string when stabbing in or out of the packer unless consideration has been given to bypass routes.
c The most common method of spacing out the seal assembly is to stab into the packer and land off in the locator, then pull back and adjust the spaceout as required.
Methods of depth correlation that avoid stabbing the seal assembly into the permanent packer, eg tubing RA sub and GR correlation run, can be used if the risk of damaging the seals by stabbing in twice is considered high.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2060
SUBJECT RUNNING TEST STRING JACKUPS
REVISION 0
DATE 01/10/92