Application of plug removal technology by self-generated heated gas and acid compound on horizontal wells in Jinxian 1-1 Oilfield

Due to the multiple damages in A32H and A33H horizontal wells in Jinxian 1-1 oilfield, such as high clay content, high viscosity of reservoir crude oil, organic deposit and drilling fluid leakage, the oil production rate is lower than that is expected after well completion, and moreover, the common acidification technique was of no effect. So the combined plug removal technology of chemical self-generated heated gas, acidification and nitrogen gas foam diffluent technique was employed, in which sodium nitrite and urea serve as self-generated reactive chemicals, fluorin boric acid as acidific fluid, and nitrogen foam diversion as acid deploying technology. The oil rate is increased greatly after its application. The technique is an important stimulation treatment for horizontal wells in Jinxian 1-1 Oilfield.