特高压注水技术在中原油田的研究与应用

中原油田深层低渗透及特低渗透油藏在井口注水压力小于31.4MPa条件下,注不进水或完不成地质配注水量,造成采油速度低、自然递减幅度大。为此,进行了特高压注水技术研究,将井口注水压力提高到接近于地层破裂压力,使地层产生微裂缝,从而提高地层渗透率,将水注到油层,实现补充地层能量、增加水驱动用储量的目的。开展了特高压注水方式及选井原则、套管保护技术、地面工程配套技术研究,制定了特高压安全注水操作规程、设计规范等,形成了系列特高压安全注水工艺。经过3年的推广应用,确保了特高压注水工作的安全生产,取得了显著的经济效益和社会效益。

Study and Application of Extremely High Pressure Water Injection Technology in Zhongyuan Oilfield

The wellhead water injection pressure is lower than 31.4 MPa for deep reservoirs of low and extremely low permeability, little water is injected into the well which leads to low production speed and large natural descending. Study on water injection technology of extremely high pressure is conducted, which increases the injection pressure approximately up to the formation fracture pressure, so that micro-fractures can be produced and thus improve the permeability and push the water into formation, so as to compensate formation energy and improve the flooding efficiency. The study coves injection methods, well selection principle, casing protection, surface engineering auxiliary technology, safety operation procedures and designing specifications, etc. The technology has been applied for 3 years and remarkable economical and social benefits have been achieved.