ANSI API RP 19D-2008 Measuring the Long-term Conductivity of Proppants (First Edition Errata July 2008).pdf

1、Measuring the Long-term Conductivity of ProppantsANSI/API RECOMMENDED PRACTICE 19DFIRST EDITION, MAY 2008ERRATA, JULY 2008REAFFIRMED, MAY 2015ISO 13503-5 (Identical), Part 5: Procedures for measuring the long-term conductivity of proppantsSpecial Notes API publications necessarily address problems o

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13、PI standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publication

14、s and materials is published annually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005. Suggested revisions are invited and should be submitted to the Standards and Publications Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org. iiContents Page API F

15、oreword ii Foreword .v Introductionvi 1 Scope1 2 Normative reference1 3 Terms and definitions .1 4 Abbreviations.2 5 Procedures for evaluating long-term proppant pack conductivity 2 5.1 Objective.2 5.2 Discussion2 6 Reagents and materials 2 6.1 Test fluid.2 6.2 Sandstone 3 7 Long-term conductivity t

16、est apparatus.3 7.1 Test unit3 7.2 Hydraulic load frame .3 7.3 Pack width measurement device(s).3 7.4 Test fluid drive system3 7.5 Differential pressure transducers3 7.6 Back-pressure regulators.3 7.7 Balance.4 7.8 Oxygen removal.4 7.9 Temperature control4 7.10 Silica saturation and monitoring4 8 Eq

17、uipment calibration.5 8.1 Pressure indicators and flow rates5 8.2 Zero pack width measurement.5 8.3 Determination of cell width.5 8.4 Hydraulic load frame .6 9 Leak tests .6 9.1 Hydraulic load frame .6 9.2 Test fluid system .6 10 Procedure for loading the cells6 10.1 Preparation of the test unit.6 1

18、0.2 Cell setup7 11 Loading cell(s) in the press8 12 Acquiring data9 13 Calculation of permeability and conductivity.9 14 Data reporting 11 Annex A (informative) Conversion factors .12 Annex B (normative) Silica-saturation vessel setup.13 Annex C (informative) Figures 15 Bibliography . 24 Foreword IS

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23、ying any or all such patent rights. ISO 13503-5 was prepared by Technical Committee ISO/TC 67, Materials. equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 3, Drilling and completion fluids, and well cements. ISO 13503 consists of the followin

24、g parts, under the general title Petroleum and natural gas industries Completion fluids and materials: Part 1: Measurement of viscous properties of completion fluids Part 2: Measurement of properties of proppants used in hydraulic fracturing and gravel-packing operations Part 3: Testing of heavy bri

25、nes Part 4: Procedure for measuring stimulation and gravelpack fluid leakoff under static conditions Part 5: Procedures for measuring the long-term conductivity of proppants vIntroduction This part of ISO 13503 is largely based on API RP 611. Informative references are also included in the Biblograp

26、hy, References 2 to 15. The tests and test apparatus herein have been developed to establish standard procedures and conditions for use in evaluating the long-term conductivity of various hydraulic fracture proppant materials under laboratory conditions. This procedure enables users to compare the c

27、onductivity characteristics under the specifically described test conditions. The test results can aid users in comparing proppant materials for use in hydraulic fracturing operations. The procedures presented in this publication are not intended to inhibit the development of new technology, materia

28、ls improvements, or improved operational procedures. Qualified engineering analysis and sound judgment is required for their application to fit a specific situation. This part of ISO 13503 may be used by anyone desiring to do so. Every effort has been made by ISO and API to ensure the accuracy and r

29、eliability of the data contained in it. However, ISO and API make no representation, warranty, or guarantee in connection with this part of ISO 13503, and hereby expressly disclaim any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, o

30、r municipal regulation with which this part of ISO may conflict. In this part of ISO 13503, where practical, U.S. customary units are included in parentheses for information. vi1 Petroleum and natural gas industries Completion fluids and materials Part 5: Procedures for measuring the long-term condu

31、ctivity of proppants CAUTION The testing procedures in this part of ISO 13503 are not designed to provide absolute values of proppant conductivity under downhole reservoir conditions. Long-term test data have shown that time, elevated temperatures, fracturing fluid residues, cyclic stress loading, e

32、mbedment, formation fines and other factors further reduce fracture proppant pack conductivity. Also, this reference test is designed to measure only the frictional energy losses corresponding to laminar flow within a pack. It is recognized that fluid velocity within an actual fracture can be signif

33、icantly higher than in these laboratory tests, and can be dominated by inertial effects. 1 Scope This part of ISO 13503 provides standard testing procedures for evaluating proppants used in hydraulic fracturing and gravel-packing operations. NOTE The “proppants” mentioned henceforth in this part of

34、ISO 13503 refer to sand, ceramic media, resin-coated proppants, gravel packing media, and other materials used for hydraulic fracturing and gravel-packing operations. The objective of this part of ISO 13503 is to provide consistent methodology for testing performed on hydraulic-fracturing and/or gra

35、vel-packing proppants. It is not intended for use in obtaining absolute values of proppant pack conductivities under downhole reservoir conditions. 2 Normative reference The following referenced document is indispensable for the application of this document. For dated references, only the edition ci

36、ted applies. For undated references, the latest edition of the referenced standard (including any amendments) applies. ISO 3506-1, Mechanical properties of corrosion-resistant stainless-steel fasteners Part 1: Bolts, screws and studs 3 Terms and definitions 3.1 conductivity width of the fracture mul

37、tiplied by the permeability of the proppant pack 3.2 laminar flow type of streamlined flow for single-phase fluids in which the fluid moves in parallel layers, or laminae, such that the layers flow smoothly over each other with instabilities being dampened by the viscosity2 API Recommended Practice

38、19D/ISO 13503 3.3 Ohio sandstone fine-grained sandstone found in the United States from the Scioto Formation in southern Ohio 3.4 permeability a measure of the ability of media to transmit fluid through pore spaces 4 Abbreviations API American Petroleum Institute ASTM American Society for Testing an

39、d Materials RTV Room temperature vulcanizing ANSI American National Standards Institute PID Proportional-integral device 5 Procedures for evaluating long-term proppant pack conductivity 5.1 Objective The objective is to establish a standard test procedure, using a standard apparatus, under standard

40、test conditions to evaluate the long-term conductivity of proppants under laboratory conditions. This procedure is used to evaluate the conductivity of proppants under laboratory conditions but is not intended for use in obtaining absolute values of proppant pack conductivities under downhole reserv

41、oir conditions. The effects of fines, formation hardness, resident fluids, time, and/or other factors are beyond the scope of this procedure. 5.2 Discussion In this part of ISO 13503 procedure, a closure stress is applied across a test unit for 50 h 2 h to allow the proppant sample bed to reach a se

42、mi-steady state condition. As the fluid is forced through the proppant bed, the proppant pack width, differential pressure, temperature and flow rates are measured at each stress level. Proppant pack permeability and conductivity are calculated. Multiple flow rates are used to verify the performance

43、 of the transducers, and to determine darcy flow regime at each stress; an average of the data at these flow rates is reported. A minimum pressure drop of 0.01 kPa (0.002 0 psi) is recommended; otherwise, flow rates shall be increased. At stipulated flow rates and temperature conditions, no apprecia

44、ble non-darcy flow or inertial effects are encountered. After completing the rates at a closure stress level in all cells, the closure stress is increased to a new level; 50 h 2 h is allowed for the proppant bed to reach a semi-steady state condition, and multiple flow rates in all cells are introdu

45、ced to gather data required to determine proppant pack conductivity at this stress level. The procedure is repeated until all desired closure stresses and flow rates have been evaluated. To achieve accurate conductivity measurements, it is essential that single-phase flow occurs. Test condition para

46、meters, such as test fluid, temperature, loading, sandstone and time, at each stress shall be reported along with long-term conductivity and permeability data. Other conditions can be used to evaluate different characteristics of proppants and, therefore, can be expected to produce differing results

47、. 6 Reagents and materials 6.1 Test fluid The test fluid is 2 % by mass potassium chloride (KCl) in a deionized or distilled-water solution filtered to at least 7 m. The potassium chloride shall be at least 99.0 % by mass pure. Measuring the Long-term Conductivity of Proppants 3 6.2 Sandstone Ohio s

48、andstone cores should have dimensions of 17.70 cm to 17.78 cm (6.96 in to 7.00 in) in length, 3.71 cm to 3.81 cm (1.46 in to 1.50 in) wide, and a minimum of 0.9 cm (0.35 in) thick. The ends of the sandstone cores shall be rounded to fit into the test unit (see 7.1). Parallel thickness shall be maint

49、ained within 0.008 cm ( 0.003 in). 7 Long-term conductivity test apparatus 7.1 Test unit The test unit shall be a linear flow design with a 64.5 cm2(10 in2) proppant and bed area. Figure C.1 illustrates the details of the test unit and an example of how cells can be stacked. The pistons and test chamber(s) shall be constructed of 316 stainless steel (e.g. ISO 3506-1, Grade A4), Monel1)or Hastalloy material. Filters for the test unit may be constructed using Monel wire cloth with an opening of 150 m or equivalent (100 US mesh). Nominal particle retention