Can one who suffers from continuous flatulence pray Tarawih and Qiyam al-Layl with a single ablution, or must he renew his ablution in the middle of the night?

One who is afflicted with perpetual ritual impurity performs ablution (wudu) after the time for prayer begins and then prays. Whatever is discharged from him during the prayer does not harm him, and his ablution is not invalidated by it, unless another impurity occurs. Sheikh al-Islam Ibn Taymiyyah said: "Whoever is unable to maintain purity for the duration of the prayer, performs ablution and prays, and whatever is discharged from him during the prayer does not harm him, nor is his ablution invalidated by it, by agreement of the Imams. The most that is required of him is to perform ablution for each prayer." You should perform ablution for the 'Isha prayer and then pray 'Isha and what follows it, such as the regular sunnah prayers and Tarawih. You are not required to renew your ablution for Qiyam al-Layl after midnight, unless another impurity occurs from you. This is what Sheikh Ibn 'Uthaymeen preferred.