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North Cowden Asset Best Practices to Reduce ROTW and Rod Pump Failures Pete Maciula Production Coordinator Robert Ricks Lift / Downhole Specialist.

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Presentation on theme: "North Cowden Asset Best Practices to Reduce ROTW and Rod Pump Failures Pete Maciula Production Coordinator Robert Ricks Lift / Downhole Specialist."— Presentation transcript:

1 North Cowden Asset Best Practices to Reduce ROTW and Rod Pump Failures Pete Maciula Production Coordinator Robert Ricks Lift / Downhole Specialist

2 Best Practice Documentation – This form is intended to capture artificial lift related best practices being applied by OXY Permian’s North Cowden Asset Downhole Team. Location: North Cowden Date practice began: 1999 Date practice ceased: Current practice Problems: 1. Excessive tubing failures in beam pumped wells with the majority caused by rod on tubing effects. 2. Excessive rod pump failures in beam pumped wells with the majority due to design, solids, over pumping, and/or corrosion.

3 Need: The majority of the North Cowden tubing failures appeared to be caused by rod on tubing effects (wear/corrosion). Several “Best Practices” were developed to reduce those cause of failures. Indicators of success: Realization of a 58.7% reduction in tubing failures since Tubing Best Practices

4 Historical Tubing Failures

5 Several “Best Practices” were utilized in accomplishing the reduction of tubing failures (primarily due to ROTW): 1.Loose fit pumps (increased pump clearances). Recommended plunger to barrel fit clearances: 1-1/4”0.004” to 0.006” 1-1/2”0.005” to 0.008” 1-3/4”0.006” to 0.009” 2”0.007” to 0.009” 2-1/4”0.007” to 0.010” 2.Recommend a maximum PRV of 240 Ft/Min. PRV Ft/Min = (SL x SPM X 2) / 12 3.Sinker bars rather than 1” rods in bottom rod design to reduce compression. Recommended sinker bar utilization: 1-5/8” no-neck with 7/8” pin Gr K with 7/8” SH SM couplings in 2-7/8” tubing. 1-1/2” no-neck with ¾” pin Gr K with ¾” FH SM couplings in 2- 3/8” tubing. 4.Rod rotators on problem wells and on all wells with rod guides. Tubing Best Practices

6 5.Discourage the utilization of rod guides in the rod string. However, in wells with ROTW due to deviation where no other method has proven successful the utilization of Amodel PPA non-glass filled molded on rod guides with 4 guides per rod in IPC tubing and Amodel PPA 33% glass filled in bare tubing. 6.On well failure pulls with 2-7/8” tubing and with any wear on rods, removal of one 25’ rod and installation of 2 – 1” x 12’ plastic coated rod subs (one at bottom and one at top of string) to alternate the wear pattern. On subsequent pulls install one 25’ rod and remove the two subs. Continued process on subsequent alternative pulls. 7.Pump stabilizer rod subs. Recommended pump stabilizer rod subs: 1”x4’ type 90 Gr KD sub with 7/8” pin and 3 Amodel PPA non- glass filled guides in 2-7/8” tubing. 7/8”x4’ type 90 Gr KD sub with 3/4” pin and 3 Amodel PPA non- glass filled guides in 2-3/8”. Tubing Best Practices

7 8.Utilization of TK-99 IPC tubing from the marker sub (just above the TAC) down. 9.TAC landing tension of 18 points. 10.Performing WH tubing scanning on wells where excessive rod wear is found and on problem wells. When performing WH tubing scanning, the process of scanning all the tubing, including that below the TAC even if you know that tubing below the TAC to be bare and plan to replace with IPC in order to establish any wear or corrosion intervals. 11.Performing WH tubing scanning to include the classification of Double Green (31-40% wall loss) and utilization of this DG tubing in the top 1500’ of the tubing string while landing with Yellow or new tubing (designed more for cost reduction). 12.Utilization of Lufkin SROD and Theta RodStar for predictive wave equation programs. Tubing Best Practices

8 13.SPOC settings: Maintain ’ gas free fluid above pump at pump off. Maximum of 25 cycles per day. Maximum of 2 consecutive pump off strokes. Maximum of 2 consecutive load violation strokes. 14.More timely and accurate fluid level data. Utilization of Lufkin Ventawave and Echometer Model E equipment for fluid level data gathering. 15.Post failure follow up program by PFA and SPOC Tech. 30 days post restoring failed well to production the PFA and SPOC Tech perform well analysis to include: Fluid level. Pump cards – Startup, Shutdown, and Live Action. Low and High Limits. Run Times and Cycle Times. Pump Off Strokes. Dynamometer analysis. Spreadsheet recording of any parameter changes made and when made. Tubing Best Practices

9 16.Corrosion chemical program. –Corrosion monitoring: Weight Loss Coupons. LPR probes (instantaneous corrosion rates). –Corrosion inhibitor types: Oil soluble water dispersible chemical on low FAP wells (<800’ FAP). Water soluble chemical on higher FAP wells (>800’ FAP). Continuous treatment (water soluble) on problem wells. –Corrosion inhibitor dosage based on total fluids: Batch treatment average 25 PPM. Increased to average 40 PPM in Continuous treatment average 25 PPM. –Corrosion inhibitor treatment frequencies based on total production: 1 per week to continuous, based upon coupon data and well failure samples. Pouring 5 gallons of oil soluble water dispersible corrosion inhibitor down tubing prior to RIH with pump and rods on all failures. Circulation with Phosphoric acid of HIT problem wells post failure repair and restoration to production (after well pumps down to <500’ FAP) to combat under deposit corrosion, followed by a slug of inhibitor to reestablish film. Tubing Best Practices

10 17.Root cause failure analysis. –Oxy DHS on-site supervision. Obtaining failure samples and photos on all fails. –Excel failure database. –Integrated Solutions Team. Tubing Best Practices

11 Need: North Cowden historical pump performance and pump component failure data indicated that there were five outstanding areas of concern: 1.Brass HVR pull tubes - wear and corrosion failures in the bending moment area. 2.Pump fit tolerances (.002” to.004” fits) – system and pump problems due to solids and friction forces. 3.Four piece, top load, insert guided cages (thin wall) – split and cracked cages. 4.Lower extension couplings on tubing pumps (bare) – internal corrosion failures. 5.Plungers on tubing pumps (bare ID) – internal corrosion causing plungers to split. Pump specifications were developed in which these areas of concern were particularly addressed. Indicators of success: Realization of a 59.7% reduction in rod pump failures since Rod Pump Best Practices

12 Historical Pump Failures

13 2005 YTD Pump MTRBF Less than 50 days = 1 51 ….100 = 3 101….250 = 1 251….365 = 2 366….730 = 2 731….1000 = ….1500 = … = 5 Greater than 2001 = 7

14 The development of pump specifications driven by local historical pump component failure data and industry best practices. Periodically review the pump specs and failure data so as to maintain an “Evergreen” program. Utilize the pump specs in conjunction with many of the afore mentioned “Best Practices” in the Tubing section. Rod Pump Best Practices

15 The “Best Practices” pump specifications: Valve Rod Insert Pump Component:Specification: Top Bushing316L SS (L has lowered carbon content) Collet Nut316L SS Valve RodGrade “K” metalized (7/8” K gr rod w/ 316 SS spray coating) Collet NutMonel Top Plunger AdapterMonel PlungerSpray Metal w/ Monel pin TV CageBottom load insert Monel w/.075” clearance inserts w/ short ball travel TV BallSilicon Nitride, alternate pattern TV SeatNickel Carbide, alternate pattern single lapped Seat PlugBrass hex only Rod Guide316L SS Rod Pump Best Practices

16 Valve Rod Insert Pump Component:Specification: Extension CouplingsBrass Barrel TubeBrass ELNI coated (Brass Nickle Carbide) BDV Connector316L SS BDV Jacket316L SS BDV CageBottom load insert Monel w/.075” clearance inserts w/ short ball travel BDV BallSilicon Nitride, alternate pattern BDV SeatNickel Carbide, alternate pattern single lapped BDV Seat PlugBrass hex only SV CageBottom load insert Monel w/.075” clearance inserts w/ short ball travel SV BallSilicon Nitride, alternate pattern SV SeatNickel Carbide, alternate pattern single lapped Mandrel Adapter316L SS Hold Down Mandrel316L SS Spacer Rings316L SS Gas Anchor Coupling316L SS Strainer Nipple24” perforated steel Rod Pump Best Practices

17 Note: Spacing TV and SV ½” to 1-1/2” Maximum Cages are three piece, bottom load, insert guided Barrel and Plunger Tolerance 1-1/4”0.004” to 0.006” 1-1/2”0.005” to 0.008” 1-3/4”0.006” to 0.009” 2” 0.007” to 0.009” 2-1/4”0.007” to 0.010” Vertical Discharge Guides Rod Pump Best Practices

18 The “Best Practices” pump specifications: Tubing Pump Component:Specification: Top Coupling J-55 API w/ TK-99 coated ID Top Lift Sub2’ Lathe cut J-55 nipple w/ TK-99 coated ID Barrel Couplings316L SS BarrelBrass ELNI coated Lower Barrel Extension18’ Lathe cut J-55 nipple w/ TK-99 coated ID Lower CouplingJ-55 API w/ TK-99 coated ID Seating Nipple316L SS API TV CageBottom load insert Monel w/.075” clearance inserts w/ short ball travel TV BallSilicon Nitride, alternate pattern TV SeatNickel Carbide, alternate pattern single lapped PlungerSpray Metal w/ Monel pins w/ TK-99 coated ID Puller Assy316L SS Rod Pump Best Practices

19 Tubing Pump Component:Specification: SV Fish Neck316L SS SV CageBottom load insert Monel w/.075” clearance inserts w/ short ball travel SV BallSilicon Nitride, alternate pattern SV SeatNickel Carbide, alternate pattern single lapped SV Mandrel316L SS SV Spacers316L SS SV Lock Nut316L SS SV Gas Anchor Coupling316L SS Strainer Nipple24” perforated steel Rod Pump Best Practices

20 Note: Spacing TV and SV ½” to 1-1/2” Maximum Cages are three piece, bottom load, insert guided Barrel and Plunger Tolerance 1-1/4” 0.004” to 0.006” 1-1/2” 0.005” to 0.008” 1-3/4” 0.006” to 0.009” 2” 0.007” to 0.009” 2-1/4” 0.007” to 0.010” Note: October 2002 made design change from 12” to 24” perforated strainer nipples (to increased area of strainer below SN). February 2003 made design changes to special clearance valve cages and alternate pattern valves (for solids and seat cracking problems). Rod Pump Best Practices

21 North Cowden Asset 720 Beam Lift Wells 106 Mark II units (Avg PRV) 265 Air Balance Units (201.3 PRV) 348 Conventional Units (179.2 PRV) 1 Rota - Flex Unit ( PRV)

22 Average Well Characteristics Beam unit with 144” – 168” SL x 7.76 SPM. Average 2.00” bore pump. Average PRV of Ft/Min. Average production rate of 350 BFPD. Average total depth of 4534’ with 300’- 400’ of open hole. Average casing shoe depth 4203’. Average tubing set depth 91’ above TD. Average TAC set depth 4102’.

23 Average Failed Well 400 BFPD 7.96 SPM Stroke Length Polished Rod Velocity (Ft/Min) 98 Tubing Failure (JFS)

24 Historical Failure Frequency

25 Problem Well Count Defined as any Two Failures within 365 days

26 Failure Index Number “Cost per Failure x Failure Frequency”


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