Shale gas horizontal well high pressure bridge plug pumping device

Abstract

The invention relates to a shale gas horizontal well high pressure bridge plug pumping device, including a well barrel, a well opening mechanism, a well opening bridge plug packaging mechanism, a bridge plug pumping mechanism, and a fracturing fluid pumping mechanism. The well opening mechanism and the well opening bridge plug packaging mechanism are correspondingly connected to both ends of the well barrel, and the bridge plug pumping mechanism and the fracturing fluid pumping mechanism are connected with the well barrel in a pipeline mode. Due to the fact that the bridge plug pumping mechanism and the fracturing fluid pumping mechanism of the shale gas horizontal well high pressure bridge plug pumping device are separately arranged, independent control over the bridge plug pumping mechanism and the fracturing fluid pumping mechanism can be realized without interference, and the bridge plug pumping mechanism can be maintained during operation of the shale gas horizontal well high pressure bridge plug pumping device; and a pressure relief assembly can ensure normal starting of the well opening mechanism, etc., abnormal damage of the shale gas horizontal well high pressure bridge plug pumping device is avoided, and working reliability of the well opening mechanism, etc., can be further ensured.

Description

technical field [0001] The invention relates to the technical field of shale gas horizontal well engineering, in particular to a high-pressure pumping bridge plug device for shale gas horizontal wells. Background technique [0002] At present, natural gas resources are increasingly difficult to meet demand in large-scale industrial development, and shale gas, as a kind of unconventional natural gas, has become an important supplement. The key to obtaining industrial production capacity of shale gas wells is to use horizontal wells, but since shale gas wells are mainly completed by casing perforation in horizontal wells, and the horizontal section is greater than 1000m, staged perforation fracturing must be used. Shale gas horizontal wells generally use cable transmission, hydraulic pumping composite bridge plugs and combined perforation technology to realize staged fracturing of horizontal wells without using drilling rigs and workover rigs , is the key technology to realiz...

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Problems solved by technology

[0003] The existing equipment and processes for high-pressure pumping bridge plugs in horizontal shale gas wells (liquid-supply mixing truck, low-pressure manifold, high-pressure manifold, and well-entry pipeline) all adopt main pressure equipment and processes. The following problems exist: (1) The slick water fracturing fluid used in shale gas horizontal wells has weak sand-carrying capacity, complex high and low manifold structures, many variable diameter structures, and large friction loss, resulting in upper and lower pressures in the high and low pressure processes. Residual proppant during a stage of construction, the residual proppant will cause the cable to be jammed and blocked during the later stage; (2) The displacement fluid contains a large amount of proppant during the displacement process, and the displacement process adopts non-over displacement process, resulting in sand accumulation in the wellbore fluid, production accidents such as downhole tool string getting stuck, pumping off, and bridge plug midway sealing; (3) The wellhead pressure is high, generally after staged fracturing, the wellhead is always under pressure, Generally higher than 25MPa, because there is no wellhead pressure balance system, the wellhead process control high-pressure components cannot be opened normally; (4) The pumping bridge plug process needs to be carried out with the help of the high and low pressure manifold processes in the main pressure zone, and cannot be controlled during pumping The fracturing pump truck is undergoing equipment rectification; (5) After the pumping is completed, the fracturing pump truck is in the state of stopping and waiting for a long time while the cable is being pulled out of the bottom of the well, resulting in unnecessary non-production time limit; (6) It cannot meet The need for synchronous construction of multi-well cross fracturing in well factory fracturing

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