Research and Application of Tight Oil and Gas Tail Pipe Connection Non-cementing Fracturing Well Borehole Technology
In order to resolve the contradiction between the demand for high pressure wellbore dur-ing the transformation of tight oil and gas reservoirs,the demand for low-cost wellbore construc-tion due to production efficiency,the demand for large wellbore diameter in production technolo-gy,and safe and efficient mining,the full-diameter wellbore technology with retrievable tail pipe cementing and segmented fracturing was investigated.By analyzing the different emphasis of well performance requirements during reservoir transformation and production construction stages,a plug and lock non-cementing connection after tail pipe cementing was proposed,which provides full bore and high pressure well conditions for reservoir reconstruction and fracturing construc-tion.By studying the integrated technology combination of cementing and completion,the struc-tural design and process application of the tail pipe cementing tool function extending to the com-pletion function were proposed.By analyzing the axial force on the completion string during the fracturing process,reference was provided for the optimization design of the anchoring locking mechanism,the construction of the return pipe string,and the optimization of parameters such as displacement and pressure during fracturing construction.This technology has been applied to more than 500 highly deviated and horizontal wells in several tight gas reservoirs,such as North China Oil and Gas Company,Shengli Oilfield.The total construction pressure is relatively high and the overall performance is good.Research has shown that tail pipe cementing can retrieve and connect segmented fracturing full-bore well technology,which can solve the technical problems of gas channeling caused by fracturing construction damage to the casing cement sheath,leading to wellhead pressure and endangering safety production.It provides a low-cost,high-pressure,full-bore and easy-to-operate new technical solution for the efficient and safe development of tight oil and gas reservoirs,and promotes the efficient development of oil and gas.
tail pipe cementingcan be connected backtight oil and gassegmented fracturinganchoring and sealing
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