Mô phỏng số dòng hơi nước siêu nhiệt trong giếng khoan 2 ống

Fengrui Sun1,2, Yuedong Yao1,2, Xiangfang Li1
1College of Petroleum Engineering, China University of Petroleum, Beijing, People’s Republic of China
2State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, People’s Republic of China

Tóm tắt

Trong bài báo này, một mô hình mới được trình bày để ước lượng các thuộc tính nhiệt lý của hơi nước siêu nhiệt (SHS) trong các giếng khoan 2 ống (DTW). Đầu tiên, một mô hình toán học bao gồm phương trình bảo toàn khối lượng, phương trình cân bằng động lượng và phương trình cân bằng năng lượng trong ống đôi tích hợp (IJT) và các khoảng không gian là đề xuất cho các giếng khoan 2 ống đồng tâm (CDTW), và trong ống chính (MT) và ống phụ (AT) đối với các giếng khoan 2 ống song song (PDTW). Thứ hai, phân bố nhiệt độ, áp suất và độ siêu nhiệt dọc theo các giếng được thu được bằng phương pháp sai phân hữu hạn trong không gian và được giải bằng kỹ thuật lập phương trị. Cuối cùng, dựa trên mô hình đã được xác nhận, phân tích độ nhạy của nhiệt độ bơm được thực hiện. Kết quả cho thấy: (1) tác động của sự khác biệt nhiệt độ bơm giữa MT và AT lên các profile nhiệt độ là yếu so với sự khác biệt giữa IJT và các khoảng không gian; (2) gradient nhiệt độ trong IJT và các khoảng không gian gần miệng giếng lớn hơn so với ở MT và AT; (3) độ siêu nhiệt trong cả CDTW và PDTW đều tăng khi nhiệt độ bơm trong IJT và MT lần lượt tăng; (4) độ siêu nhiệt trong IJT và MT giảm nhanh gần miệng giếng, nhưng độ siêu nhiệt trong các khoảng không gian và AT lại tăng lên; (5) bức xạ nhiệt và đối lưu là các phương thức chính để trao đổi nhiệt giữa MT và AT. Bài báo này cung cấp cho các kỹ sư một cái nhìn mới về đặc điểm dòng chảy và truyền nhiệt của SHS trong DTW, đồng thời cung cấp một phương pháp tối ưu hóa các thông số bơm cho mỏ dầu.

Từ khóa

#mô phỏng số #hơi nước siêu nhiệt #giếng khoan 2 ống #thuộc tính nhiệt lý #phân tích độ nhạy

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