SAGD shaft liquid extrusion pretreatment method

Abstract

The invention provides a SAGD shaft liquid extrusion pretreatment method. The method comprises the following steps: a liquid extrusion pretreatment device is assembled as follows: an outlet of an injecting pipe is connected to a middle pipe to form a first tee joint; a first end of a short pipe connecting pipe is connected to the middle pipe to form a second tee joint; a third end of a long pipe connecting pipe is connected to the middle pipe to form a third tee joint; and then, a first switch valve, a second switch valve, a third switch valve, a fourth switch valve and a fifth switch valve are provided; the liquid extrusion pretreatment device connects an injecting pump with a SAGD shaft as follows: an inlet of the injecting pipe is connected to the injecting pump; a second end of the short pipe connecting pipe is connected to a short pipe of the SAGD shaft; a fourth end of the long pipe connecting pipe is connected to a long pipe of the SAGD shaft; and the injecting pump and the liquid extrusion pretreatment device are used for injecting and draining liquid in and out from the short pipe and/or the long pipe. The method can satisfy the requirements of the SAGD shaft liquid extrusion pretreatment method on the ground flow pipe manifold.

Description

Technical field [0001] The present invention relates to the technical field of petroleum exploitation, in particular, to a pretreatment method for squeezing liquid of SAGD wellbore. Background technique [0002] SAGD (steam flooding production method) refers to the continuous injection of high temperature and high dryness steam toward the SAGD wellbore. First, a steam cavity is developed to heat the oil layer and maintain a certain oil layer pressure to drive the crude oil to the surrounding production wells and then produce it. Among them, in a single well of a steam injection horizontal well, a short pipe and a long pipe are run. The short pipe runs at point A (the starting point of the horizontal section), and the long pipe runs to point B (the end point of the horizontal section). [0003] The SAGD wellbore squeeze liquid pretreatment technology is mainly based on the existing SAGD horizontal well string conditions, inject fluid at a certain pressure through the long tube in th...

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Problems solved by technology

[0004] However, if the bulk surface manifold is directly applied to the SAGD wellbore liquid extrusion pretreatment technology, there will be the following problems: (1) In the implementation process of the SAGD wellbore liquid extrusion pretreatment technology, depending on the actual situation, not only requires a long time Pipe injection and short pipe return, also need to have short pipe injection and long pipe return, long pipe and short pipe injection at the same time, long pipe and short pipe return at the same time, long pipe and short pipe separate injection, long pipe and short pipe separate return The outlet, long pipe and short pipe can be closed at the same time, so as to adapt to the function of reservoir diversity transformation

At present, the bulk manifold needs to assemble the pumping system on the ground. By adjusting the ground manifold to achieve the required process, these functions cannot be satisfied at the same time; The above process has the ability to switch quickly, which cannot be realized with bulk manifolds at present; (3) Bulk ground manifolds require several tees, short connections, gate valves, hard pipelines, high-pressure hoses, clamps, and bent necks

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