Thermal oil production pipe column for injection-production in the same well for vertical well and oil production method thereof

Abstract

The invention discloses a thermal oil production pipe column for injection-production in the same well for a vertical well and an oil production method thereof. The oil production pipe column comprises a telescopic pipe, a first insulated pipe, an upper packer, a second insulated pipe, a steam injection check valve, an oil pipe, a lower packer, an oil well pump, a sieve pipe, a tail pipe and a screwed plug which are connected in sequence from the top to bottom, an oil pumping rod is placed in the oil production pipe column, and the lower end of the oil pumping rod is connected with a traveling valve in the oil well pump; a gas injection flow passage which connects the inside to the outside in one direction is formed in the side wall of the steam injection check valve, a fixed sealing ring plate and a movable sealing ring plate placed on the fixed sealing ring plate are arranged in the inner cavity of the lower side of the gas injection flow passage, the movable sealing ring plate sleeves the oil pumping rod, and the outer periphery thereof hermetically contacts with the upper surface of the inner periphery of the fixed sealing ring plate. The thermal oil production pipe column for the injection-production in the same well for the vertical well and the oil production method thereof are capable of effectively using the steam heat, improving the economical benefit and improving the cyclic steam stimulation effect for thickened oil.

Description

technical field [0001] The invention belongs to the field of steam thermal oil recovery, and relates to a steam huff and puff oil recovery device and an oil recovery method, in particular to a same-well injection-production thermal oil recovery pipe string and an oil recovery method for vertical wells. Background technique [0002] In oil well production, conventional thermal oil recovery for vertical wells is mainly steam huff and puff. Among them, steam huff and puff refers to injecting a certain amount of steam into the oil well, shutting the well for a period of time, and then opening the well to produce heavy oil after the heat energy of the steam diffuses to the oil layer. The main method, about 80% of the country's heavy oil production is obtained by the steam stimulation process. The conventional steam huff and puff implementation process is to complete the entire well section of the heavy oil reservoir, and to perform periodic steam injection and oil recovery in th...

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Problems solved by technology

There are three main problems in this method: 1. The water content of the production fluid produced at the initial stage of venting is close to 100%, and the temperature is very high, resulting in a certain waste of heat injected into the steam; 2. Two sets of strings are used for steam injection and oil recovery. Two sets of pipe strings, each round requires two operations, and the operation cost is high; 3. The lower production string needs to be killed, and part of the heat accumulated in the formation will be lost during the operation time. Although the well kill operation uses hot sewage ( 80 ℃), but the hot sewage has a certain cooling and pollution effect on the near-well area; 4. The lifting process in the later stage of steam huff and puff requires heat tracing technology, which increases the lifting cost

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