API SPEC 10F-2020 pdf download.Cementing Float Equipment Testing.
1 Scope This specification provides testing and marking requirements for cementing float equipment to be used in oil and natural gas well construction. 2 Normative References The following referenced documents are indispensable for the application of this document. For undated references, the latest edition of the referenced document applies (including any addenda/errata). For dated references, only the edition cited applies. However, not all documents listed may apply to your specific needs. The body of the standard should be referred to for how these documents are specifically applied. API Recommended Practice 13B-1, Field Testing Water-Based Drilling Fluids API Specification 13A, Drilling Fluid Materials API Specification Q1, Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry For a list of other documents associated with this standard, see the Bibliography. 2.1 Use of SI and U.S. Customary Units This document contains derived metric units (SI) and U.S. customary oilfield units. For the purposes of this document, the conversion between the systems is not exact and has been intentionally rounded to allow for ease of use in calibration and measurement. 3 Terms and Definitions For the purposes of this specification, the following terms and definitions apply. 3.1 annulus Area between the casing and open hole or previously set casing. 3.2 autofill (auto-fill) A feature incorporated in the design of some float equipment that allows the flow check system(s) to be initially disengaged so fluid may pass in either direction when running a string of casing. This feature facilitates casing fill-up and may also be used for surge reduction. NOTE This action may reduce surge pressures in the well that may otherwise be present if float valves remained closed during running of the casing.
Auto-fill float equipment is a special type of float equipment that allows the casing to fill from the bottom as the casing is run into the well. This may help reduce pressure surges as the casing is lowered into the well. Auto-fill float equipment may help ensure that the collapse pressure of the casing is not exceeded. Once the casing is run, the auto-fill float equipment check valve mechanism is activated, and the float equipment is converted to “standard” equipment. The conversion is normally executed by either pumping a surface- released ball through the equipment or by circulating above a predetermined rate. 5.2 Performance of Cementing Float Equipment There are a number of performance criteria that may be used to evaluate the suitability of a particular piece of float equipment for a given well. Float equipment should function after a fluid containing solids has been circulated through the equipment for a period of time. Flow period, flow rate, fluid temperature, and fluid properties can affect the durability of the equipment. Float equipment should be capable of withstanding a differential pressure with the higher pressure being exerted from below the check valve, and capable of functioning at the temperature to which it is exposed. The testing procedures consist of: a) flow durability; b) static pressure and temperature testing. The flow durability tests entail installing the float equipment in a flow loop and pumping a specified test fluid for a set amount of time. This is followed by applying a low backpressure to determine if the valve holds pressure. If casing fill-up equipment is being evaluated, the equipment is subjected to reverse flow of fluids for a specified time and then converted prior to testing forward flow. Following the flow durability tests, the float equipment is mounted in an apparatus that allows the equipment to be heated to elevated temperature and backpressure applied to determine if the valve leaks.