SPM EXL翼形螺母正在申請專利，其設(shè)計旨在降低導(dǎo)致傳統(tǒng)翼形螺母故障的重力，同時提供可實施在新的和使用中的客戶資產(chǎn)上的解決方案。

產(chǎn)品概述

設(shè)計挑戰(zhàn)

翼形螺母故障有兩個主要來源：周期性負荷引起的疲勞裂紋和錘擊產(chǎn)生的過大負載沖擊。與泵送操作期間產(chǎn)生的典型脈動相配合的連續(xù)側(cè)向載荷力對鐵錘設(shè)備產(chǎn)生顯著的應(yīng)力水平。因此，疲勞裂紋形成可能發(fā)生在螺紋根部，其可以軸向傳播并導(dǎo)致意外的分離。

解決方案

SPM EXL翼形螺母正在申請專利，有助于從源頭解決故障，并在內(nèi)螺紋上具有全根半徑，以幫助小化應(yīng)力濃度。這種設(shè)計特征還有另外的益處，即增大間隙以增加螺紋中積聚的碎屑，有助于正確組裝。向前延伸的稠化劑凸耳與較大的外徑配對可通過抑制傳播路徑減少裂紋，并提供更大的表面積來吸收鐵錘沖擊載荷。 SPM EXL翼形螺母可以改進現(xiàn)有的SPM產(chǎn)品，并且與大多數(shù)現(xiàn)有的具有相當尺寸和壓力等級的鐵錘聯(lián)接頭兼容。

設(shè)計確認

SPM EXL翼形螺母的設(shè)計旨在使關(guān)鍵位置的應(yīng)力濃度小化。通過綜合分析證實，該設(shè)計減少的疲勞應(yīng)力導(dǎo)致故障前的循環(huán)增加了235%。這種疲勞分析主要基于1500 lb. 交替?zhèn)认蜉d荷。

應(yīng)用

壓裂

固井

油井服務(wù)

關(guān)于鼎恒石油

四川鼎恒石油是Weir SPM的授權(quán)代理商，若需要購買SPM產(chǎn)品或需要了解產(chǎn)品詳細參數(shù)及相關(guān)疑問，可直接進入鼎恒石油官網(wǎng)咨詢網(wǎng)站客服或者撥打銷售熱線18000522697。

四川鼎恒石油機械設(shè)備有限公司(http://www.kawai-kstw.com)是一家擁有進出口經(jīng)營權(quán)，長期從事國內(nèi)外石油天然氣設(shè)備和配件的專業(yè)銷售公司。鼎恒石油公司總部設(shè)在四川成都，在加拿大大不列顛哥倫比亞省成立了分公司。我公司與多家世界知名制造廠商建立了緊密的合作關(guān)系。

注：該文章由鼎恒石油編譯，轉(zhuǎn)發(fā)須注明出處。

附英文原文：

SPM® EXL Wing Nut

The patent pending SPM® EXL wing nut is designed to reduce stresses that have been a cause of legacy wing nut failures, while providing a solution that can be implemented on new and in-use customer assets.

Overview

Design Challenges

There are two primary sources of wing nut failure: fatigue cracks from cyclical loading and excessive load impact from hammer strikes. Continual side load forces paired with the typical pulsations produced during pumping operations create significant levels of stress on hammer unions. Consequently, fatigue crack formations may develop at the thread root which can propagate axially and lead to an unexpected separation.

The Solution

The patent pending SPM® EXL wing nut helps address failures at their source and features a full root radius on the internal threads to help minimize stress concentrations. This design feature also provides the additional benefit of added clearance for debris accumulation in the threads, assisting with proper assembly. Thicker lugs that extend forward, paired with a larger outside diameter, reduce cracking by suppressing the propagation path and provide a greater surface area to absorb hammer impact loads. The SPM® EXL wing nut can be retrofitted to existing SPM® product and is compatible with most existing hammer union connections of comparable size and pressure rating.

Design Validation

The SPM® EXL wing nut is engineered to minimize stress concentrations at critical locations. A comprehensive analysis confirmed the design reduced fatigue stress resulting in a 235% increase in cycles prior to failure. This fatigue analysis is based on 1,500 lb. alternating side load.

Applications

Fracking

Cementing

Well Service