{'fraction_non_alphanumeric': 0.016498137307078234, 'fraction_numerical': 0.0, 'mean_word_length': 5.5964912280701755, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Establishment and Evaluation of an Effective Driving Pressure System in a Rectangular Five-Spot Pattern

Abstract For rapid production decline in low-permeability reservoirs, and for pressure transmission discipline between injection and production wells, effective driving pressure system is proposed. An effective driving pressure system can supplement enough energy to layer on time to curb production decline. The calculation of pressure drop at a point in infinite rectangular five-spot pattern is simplified into pressure drop overlay of two bounded rectangular reservoirs by mirror image and inverse mirror image theory. Layer pressure caused by a well with uniform flux fracture in the center of a bounded rectangular reservoir is gained by integrating instantaneous source function. Bottomhole pressure (BHP) of a well with infinite-conductivity fracture in infinite five-spot pattern is gained by pressure overlay while injection and production wells work at the same time. The method of establishing and the model of evaluating effective driving pressure system are gained by demanding for time limits on BHP of the fractured well. Results show that the efficiency of an injection-production pressure system is in directly proportionate to reservoir thickness and permeability, producing pressure drop; is inversely proportionate to production rate and oil viscosity; and is also related to length of fractured crack, well spacing, and well draining. The bigger the production rate, the smaller the terminal well draining while other factors are given; The bigger the permeability, the bigger the production rate while other factors are given; optimizing relationship between permeability, production rate, well spacing, and well draining makes pressure system between injection and production wells stable, and an effective driving pressure system be established.