Satan can not know what your prayers and thoughts are, if you do not speak them out loud. This is a good prayer to use at the beginning of prayer:
Prayer for a Spiritual Canopy
Dear Lord Jesus, please forgive me for all the times I have not submitted to your will in my life. Please forgive me for all my sinful actions, making agreements with the enemy, and for believing the devilās lies. I now submit to you as my Lord, dear Jesus. Now I break every agreement that I have made with the enemy.
Lord Jesus, please send an assignment of angels to remove and bind to the abyss all demons and their devices that had access to me because I believed their lies. I now ask you to establish a hedge of protection around me, over me and under me, and seal it with your blood, Lord Jesus Christ.
I now choose to put on the full armour of God and ask that you cleanse me and seal me, body, mind, soul and spirit, with your blood, Lord Jesus Christ. Please have your angelic army bind up and remove all demons, their devices, and all their power from within this protective hedge and have them sent to the abyss.
Please have your angels destroy all demonic, occult or witchcraft assignments directed against me. Please have your angels stand guard over me and protect me from all attacks of the enemy. I thank you for establishing an impenetrable shield of protection around me, in Jesusā name. Amen.
Anima Christi
Soul of Christ, sanctify me; Body of Christ, save me; Blood of Christ, inebriate me; Water from the side of Christ, wash me; Passion of Christ, strengthen me; O good Jesus, hear me; within your wounds, hide me; let me never be separated from you; from the evil one, protect me; at the hour of my death, call me; and bid me to come to you; that with your saints, I may praise you forever and ever. Amen.
Hope these help you in your prayer life.
THT