Development and Application of a Casing Annulus Pressure Relief Device for Better Wellbore Integrity in Deepwater Wells
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摘要: 针对深水油气开发中因密闭环空压力升高而导致的套管挤毁、破裂等问题，研制了一种深水井套管环空泄压装置，并对其进行了性能测试和现场应用。该泄压装置以高精度破裂盘为核心部件，利用爆破片材料能瞬时泄压的特性，释放环空高压膨胀流体，消除套管环空压力升高带来的危害。破裂盘阀体选用SS316不锈钢，爆破片选用NS312镍铬合金，采用普通正拱形结构，最高设计破裂压力36.6 MPa；破裂盘套管短节采用双孔泄压设计，以防破裂失效。室内性能测试结果显示，破裂盘结构完整，耐温性能、时效稳定性好，能满足工程中0.80倍设计破裂压力条件下的稳压要求；实测破裂压力符合制造范围偏差±3.0%的设计要求；同时，随着流体介质温度升高，破裂压力降低，降低幅度不超过5.0%，小于破裂压力允值，满足现场应用需求。深水井套管环空泄压装置在南海东部某区块3口深水井进行了应用，均取得良好的应用效果，投产至今未出现由于环空压力升高导致的井下故障。研究表明，深水井套管环空泄压装置达到了预期的环空压力控制和管理的目的，可保障井筒安全。Abstract: A kind of casing annulus pressure relief device with high precision rupture disk as the core part was developed to solve the problem of annular pressure buildup problems which can cause casing collapse and rupture during deepwater oil and gas production.It makes use of the characteristics of rupture disk material to release the annulus expansion fluid instantaneous and eliminate the potential risk caused by the increase of the annulus pressure.The rupture disk assembly body is manufactured with stainless steel SS316,and burst disk is manufactured from nicochrome NS312,which incorporate a conventional domed inward type structure design with a maximum design rupture pressure level of 36.6 MPa.The rupture disk casing sub design has a double hole pressure relief to prevent failure.Laboratory tests demonstrate that the rupture disk maintains structure integrity,has high temperature resistance and good aging stability with 0.80 times of designed rupture pressure for the engineering requirement.The actual test rupture pressure complies with the design requirement of manufacturing deviation of ±3.0%.With the increasing of test fluid temperature,the test rupture pressure would slightly decrease,with the total change volume less than 5.0% and lower than rupture pressure tolerance,meeting field application requirements.The casing annulus pressure relief device achieved success in field applications in 3 deepwater wells in one eastern block of the South China Sea,and no downhole accidents have occurred up to now that were caused by annular pressure buildup problems.The research showed that the casing annular pressure relief device achieved the anticipated annular pressure management objectives and could ensure the wellbore safety.
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Keywords:
- deepwater well /
- pressure buildup /
- pressure relief device /
- rupture disk /
- performance test
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