KingFahad University of Petroleum and Minerals Collegeof Petroleum and GeosciencesPetroleumEngineering Department 171 COMPLETIONCHALLENGES UNDER HPHT CONDITIONS PreparedforDr.RAHUL N. GAJBHIYEPETE302 Studentname: Mohammed AL-NemerStudentID: 201445720 Submissiondate: 26 / 12 /2017 Table of Contents INTRODUCTION.
. 2 History. 2 Overview.. 3 OBJECTIVE. 3 CHALLENGES ASSOCIATED WITH HPHT TECHNOLOGY. 4 Materials Technology. 4 Packers.
4 Liner Hangers. 4 Polished Bore Receptacle (PBR) 5 Electronics. 5 Perforating Technology.
6 CONCLUSION.. 6 REFERENCES. 7 INTRODUCTION History Phillips Petroleum Company was pioneerin HPHT well test.
They conducted the first test in 1965 on Josephine well No.1, Mississippi, USA. The well was at depth of between 19700 – 22250 ft andexhibited pressures and temperatures of between 17.5 – 22 ksi and 365 – 385 °Fthe produced fluids contained 45 – 65 % methane, 27 – 46 % H2S and 3– 9 % CO2. Shell Oil Company was the first to complete a HPHT wellin 1969, but the well had to be neglected because of completion equipmentfatigues in the wellhead, seals, tubulars, packers and connectors.
Overview HPHT is an abbreviation for highpressure high temperature conditions. Wells which present pressures exceeding15 ksi or exhibit temperatures above 350 °F are considered to be HPHT wells. Ifoperations are to be effective, wells present particular difficulties that mustbe considered. These difficulties comprise all parts of well construction andproduction, and they need manpower and service companies to take actions.
Thoseactions rely upon the levels of pressures and temperatures experienced. Afterthe expected pressures and temperatures are resolved, rules and operationalsoftwares can be detailed to drill, evaluate, complete and securely deliverhydrocarbons. OBJECTIVE The objective of this paper is to discuss HPHT completionchallenges, and to discuss difficulties associated with introducing HPHTtechniques and equipment to the well.
CHALLENGESASSOCIATED WITH HPHT TECHNOLOGY Today, HPHT wells drilled and completedefficiently in most significant petroleum producing states in the world. Thedifficulties related to the HPHT completion have a tendency to exceed materialsabilities. Nonetheless, there are different difficulties related with boreholeequipment and electronic devices which should be considered. (Douglas et al,2014) MaterialsTechnology The knowledge of a component’sproperties within the well temperature range is a crucial part to design amaterial. This applies to nonmetallic and metallic materials. In addition, thereare other materials than metallic and nonmetallic that are used under HPHTconditions like ceramic components, composites, and lubricants. Some of themare one time use and other are lifelong. (Douglas et al, 2014) Packers Plugs and packers advanced for severeconditions as high as 500 °F and 25 ksi.
Over the last 30 years, HPHT packer evolutionmethodology promoted, the main challenge in the evolution track today is the availabilityof components and the data for metallic and nonmetallic properties, which willsustain the ultra high pressure and temperatures, and to resist corrosion. (Douglaset al, 2014) Liner Hangers Liner hangers with pack off capability (expandableseal packer) have been improved to adapt HPHT applications, usually these toolsare needed to complete their part in sealing for gas-tight demands. Nonetheless,an industry specifications fitted for the liner hangers role until now are notexist. (Douglas et al, 2014) Polished Bore Receptacle (PBR) To isolate the reservoir from the production casing annulus, PBRsystem is utilized. The PBR is run as a complementary part of the production liner,directly below the liner hanger with the seal mandrel and stack run with thecompletion string. A PBR style completion was selected over a packer stylecompletion because it provides: 1) Simpler workovers.2) Lower tubing stresses.3) Simpler completion design.
4) Successful experience in US HPHT wells and recently on theStrathspey field in the North Sea. To enhance completion efficiency and decrease the probability ofa workover, the seal stack will be installed in a static position during allproduction operations. adequate weight will be set down together with annulus stressto prevent seal movement during hot producing and cold shut in periods. Thestack is positioned in the PBR to sustain upward movement during well kill operationsor stimulation treatment. Seal stack testing at simulated bottom holeconditions are ongoing to determine the best available configuration.(G.S.
Elliott et al, 1995) Electronics Typical field electronics parts are usuallyestimated only to 257 °F, far below the estimating needed for the high temperatureborehole electronics actions such as measurement while drilling and rotarysteerable systems (RSS) that they are used in. however, the oldest and largest userof electronics for high temperature implementations is the downhole oil and gasindustry. These parts and components can have multiple failure patterns, due toelectric chemical reactions, which are quicken by increased temperatures. Asreservoir temperatures approach the plastic material’s limit, distinguishingbetween a packaging related failure and a silicon related failure is difficult.
Testing plays an important role in establishing failure patterns, and as reservoirtemperature expectations rise, engineers will also have to develop testingprograms. (Douglas et al, 2014) PerforatingTechnology Strong explosion perforating charges have improved over time andare used efficiently in most HPHT perforating applications. For temperaturesbetween 350 °F and 500 °F, HNS charges are utilized and their life isapproximated at between one and five hours. (Douglas et al, 2014)To make the largest probability of flow. Over balanceperforation is utilized when certain restrictions are encountered using tubingconveyed perforating.
Deep penetration gun appropriate for High temperatureapplication is required for creating connection between heavy walled casing andHPHT reservoir. (Al-Salali et al, 2013) CONCLUSION To overcome all HPHT challenges, we need to consider all difficultiesand how to manage equipment to sustain such conditions. HPHT wells can bedesigned safely using reliable technologies and the well should be continuouslytested and evaluated.
When completing a well, we should always consider theworst scenarios. REFERENCES Al-Salali.Y, Bader.
H, Duggirala.V, Manimaran.A, Packirisamy.S,Al- Ibrahim.A, Rajkhowa.A, (2013). Challengesin Testing and Completion ofHighly Sour HPHT Reservoir in The State of Kuwait. KOC.
Retrieved from:https://www.onepetro.org/download/conference-paper/SPE-167647- MS?id=conference-paper%2FSPE-167647-MSLehr.D, Coolins.S, (2014). The HPHT Completion Landscape -Yesterday, Today, and Tomorrow. BakerHughes.
Retrieved from:https://www.onepetro.org/download/conference-paper/SPE-170919- MS?id=conference-paper%2FSPE-170919-MS Elliott.G, Brockman.R, (1995). HPHT Drilling and CompletionDesign for the Erskine Field.
TexacoNorth Sea UK Co, SPE, Texaco Limited. Retrieved from:https://www.onepetro.org/download/conference-paper/SPE-30364- MS?id=conference-paper%2FSPE-30364-MS