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Collaborating Authors
Results
Development of a New Squeeze Scale Inhibitor for Mitigating Formation Damage for High TDS High Temperature Tight Carbonate Reservoir
Chen, Tao (Nalco Champion, an Ecolab Company) | Lewis, Jennifer (Nalco Champion, an Ecolab Company) | Chen, Ping (Nalco Champion, an Ecolab Company) | Benvie, Ronald (Nalco Champion, an Ecolab Company) | Hagen, Thomas (Nalco Champion, an Ecolab Company) | Montgomerie, Harry (Nalco Champion, an Ecolab Company)
Abstract The development of effective scale squeeze inhibitors in tight carbonate reservoirs with permeability less than 5md is still a big challenge, especially for high Total Dissolved Solids (TDS) and high temperature wells. The formation damage is one of the major considerations in high TDS, high temperature, and tight carbonate reservoirs as it can be caused due to fines mobilization, carbonate reservoir dissolution and collapse, and scale inhibitor compatibility issues. For the development of any scale inhibitor for squeeze application, the product must also demonstrate good inhibition performance, long squeeze life and accurate residual analysis at low concentrations. This paper will demonstrate a logical design procedure to develop a new scale inhibitor suitable for a challenging high TDS, high temperature tight carbonate reservoir through squeeze application. The new scale inhibitor has been shown to be nondamaging to tight carbonate reservoir material under high temperature high TDS conditions, along with excellent retention and release characteristics. The results of a comprehensive testing program, including compatibility, formation dissolution, dynamic tubing blockage and core flood tests will be presented that will highlight the development of a non-formation damage scale inhibitor suitable for the high TDS high temperature tight carbonate reservoir. In addition, the potential mechanisms of formation damage will be addressed. The impact of calcium tolerance, pH and molecular chemistry, carbonate reservoir dissolution and lab test procedure will be discussed compared to some traditional phosphonate and other polymeric scale inhibitors.
- Europe (1.00)
- North America > United States > Louisiana (0.28)
- Geology > Mineral (0.47)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Limestone (0.46)
- Water & Waste Management > Water Management > Constituents > Salts/Sulphates/Scales (1.00)
- Materials > Chemicals (1.00)
- Energy > Oil & Gas > Upstream (1.00)
Development of an Environmentally Friendly Polymer Scale Inhibitor for Tight Carbonate Reservoir Squeeze Treatment
Chen, Tao (Champion Technologies) | Benvie, Ronald (Champion Technologies) | Heath, Stephen Mark (Champion Technologies) | Chen, Ping | Hagen, Thomas Hille (Champion Technologies Ltd.) | Montgomerie, Harry (Champion Technologies)
Abstract A tight carbonate reservoir is one of the typical formations in the oil and gaswells. The unique feature of the subject reservoir is low permeability (2–5md). The formation damage, compatibility, residual analysis and squeeze lifeare still major challenges for the conventional scale inhibitor squeezetreatment in this kind of reservoir. The development of effective squeeze scale inhibitors to prevent the aboveproblems in BaSO4 scale scenario is still a big challenge, especially with theincreasing environmental constraints. For tight carbonate reservoirs, theformation damage is one of the major considerations since the formation damagecan be caused due to fines mobilization, carbonate reservoir dissolution andcompatibility issues. For the development of any product for squeezeapplication, the product must also demonstrate good performance on field scaleinhibition, long squeeze life and accurate residual analysis at lowconcentration. This paper will demonstrate a logical design procedure to develop anenvironmental friendly polymer scale inhibitor product suitable for challengingtight carbonate reservoir through squeeze application and will discuss themechanism of scale inhibitor retention with regard to selection and design ofsuitable scale squeeze inhibitors. Many scale inhibitors are either irreversibly retained in chalk reservoirs dueto uncontrolled precipitation reactions or are poorly adsorbed with bothprocesses resulting in short treatment lifetimes. A new polymeric scaleinhibitor chemistry, containing a special functional amine group to have a goodaffinity to the chalk reservoir, was developed to provide a balance betweenirreversible and poor retention and thus provide effective squeeze life. Theresults of a comprehensive testing program, including compatibility, formationdissolution, dynamic tubing blocking, static adsorption and core flood testswill be presented, that will highlight the development of polymer scaleinhibitor suitable for the tight carbonate reservoir, while meeting theenvironmental requirements for application in the UK and Scandinavia. Inaddition, a new residual detection method will be presented which willdemonstrate accurate scale inhibitor detection at low concentration (<1ppm)in high TDS water. Introduction Barium sulphate, BaSO4, is one of the most common scale deposits found inoilfields both in the North Sea and elsewhere. It can be deposited all alongthe water paths from injectors through the reservoir to the surface equipment1,2, 3. Barium sulphate is generally formed after seawater breakthrough, whenformation water containing barium mixes with seawater which is rich insulphate. Barium sulphate scale formation can impair production by blockage ofnear wellbore, tubing and flowlines, fouling of equipment and concealment ofcorrosion. The effects of scale can be dramatic and costs can beenormous4. Effective techniques are needed to solve the scale deposition and keepproducing wells healthy. In most cases, scale prevention through chemicalinhibition is the preferred method of maintaining well productivity. Scaleinhibitor squeeze treatments provide one of the most common and efficientmethods for preventing the formation of carbonate and sulphate scales in thenear wellbore and top facilities of production wells3.
- North America > United States > Texas (0.28)
- Europe > United Kingdom > North Sea (0.24)
- Europe > Norway > North Sea (0.24)
- (2 more...)
- Geology > Mineral (0.96)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.55)
- Water & Waste Management > Water Management > Constituents > Salts/Sulphates/Scales (1.00)
- Materials > Chemicals (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- North America > United States > California > Sacramento Basin > 3 Formation (0.99)
- Europe > Russia > Volga Federal District > Perm Krai > Volga Urals Basin > Pavlovskoye Field (0.99)