ONGC has , therefore , done well by continuing drilling operations in Gujarat , Himachal Pradesh , UP , West Bengal , Tripura , Assam and Andhra Pradesh . इस कारण से आयोग ने गुजरात , हिमाचल प्रदेश , उत्तरप्रदेश , पश्चिमी बंगाल , त्रिपुरा , आसाम और आंध्रप्रदेश में कुंओं की खुदाई का काम जारी रखकर अच्छा ही किया है .
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