Screened well drainage pipe structure with sealed, variable length labyrinth inlet flow control apparatus

摘要: A drainage pipe section for a horizontal subterranean well has base coaxially circumscribed by tubular structure having longitudinally intermediate portion defined sand screen assembly. An annular flow passage is formed between the and communicates with interior of via sidewall openings positioned inwardly adjacent opposite end portions structure. Annular adjustable control members variable length labyrinth passages recessed into their outer sides are interposed in ends assembly openings. The sealed within means rubber coating adhered to side surfaces, an adhesive type sealant material injected spaces facing pipe. Specially designed plugs resilient used selectively seal off vary its effective thus resistance therethrough fluid through passage. Additional structures provided at structure, each including quantity pipe, two elastomeric backup seals.