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A kind of tripping and gel technology, which is used in earth-moving drilling, sealing/packing, wellbore/well components, etc. The effect of reducing well control risks and protecting reservoirs
Inactive Publication Date: 2019-04-16
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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[0004] However, the prior art represented by the above-mentioned patent documents cannot guarantee the safety of well control during the precise pressure-controlled tripping process, and the operation is not strict, and the drilling fluid will still be lost during the entire tripping process, resulting in oil and gas reservoirs being polluted
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Embodiment 1
[0021] As a preferred embodiment of the present invention, it discloses a method for tripping out of a gel solid slug compartment, the steps of which are as follows:
[0022] Step 1: Pull out under pressure to the designed well depth, pump in the designed amount of gel, and pull out to the upper part of the gel slug;
[0023] The second step: cycle for n hours, and trigger the gel solidification by the formation temperature;
[0024] Step 3: After the gel is solidified, verify whether the downhole pressure is completely cut off. If it is completely cut off, the open well is tripped in the conventional way;
[0025] Step 4: When tripping in, go down the open well to the top of the gel solid slug, drill out the gel solid slug, then add pressure and go down to the bottom of the well with pressure to resume drilling.
Embodiment 2
[0027] As the best implementation mode of the present invention, concrete work process of the present invention:
[0028] Step 1: Pull out under pressure to the designed well depth, pump in the designed amount of gel, and pull out to the upper part of the gel slug 0.1-100m;
[0029] The second step: cycle for n hours (n=0.1-999), trigger gel solidification by formation temperature;
[0030] Step 3: After the gel is solidified, verify whether the downhole pressure is completely cut off. If it is completely cut off, the open well is tripped in the conventional way;
[0031] Step 4: When tripping in, go down the open well to the top of the gel solid slug, drill out the gel solid slug, then add pressure and go down to the bottom of the well with pressure to resume drilling.
[0032] Before the open well is pulled out, the gel is injected into the design position of the well, and then the temperature control triggers the solidification to form a slug, which cuts off the downhole p...
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Abstract
The invention discloses a gel solid slug segmented trip method, and relates to the field of drilling operation of sulfur-containing oil and gas wells. The method comprises the following steps that step1, under-pressure trip-out is performed to a designed well depth, a designed amount of gel is pumped, and trip-out is performed to the upper portion of a gel slug; step2, circulation is performed forn hours, and gel solidification is triggered through formation temperature; step3, after gel is solidified, it is verified whether or not the downhole pressure is completely blocked, and if yes, tripis performed through a well-opened normal mode; step4, during trip-in, well-opened trip-in is performed to the rear of the top of the gel solid slug, the gel solid slug is drilled, then aftercompaction is performed, under-pressure drip-in is performed to the shaft bottom, and drilling is restored. The method can achieve the well control safety during fine pressure-controlled trip, ensures that adrilling fluid cannot be lost in the whole drilling process, and effectively protects the oil and gas reservoirs.
Description
technical field [0001] The invention relates to the field of drilling operation of sulfur-containing oil and gas wells, in particular to a tripping method for drilling a narrow safe density bed in a sulfur-containing formation. Background technique [0002] The tripping method of fine-managed pressure drilling generally adopts the heavy slurry cap method, that is, the density and height of the heavy slurry cap are designed, and the drill is tripped to the design position with pressure to replace the heavy slurry cap, and then the open well is tripped out. Cycle down to the bottom. However, in practice, due to the near-zero safe density window or negative window, only the method of checking the grouting volume can be used to lift the tank and the heavy slurry cap method, and the light slurry is reversed to ensure the safety of well control, resulting in a large amount of drilling fluid loss and pollution. reservoir. [0003] The publication number is 103711452A, and the Chi...
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Application Information
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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B33/134
CPCE21B33/13E21B33/134
Inventor 李枝林梁玉林杨玻韩烈祥陆灯云肖润德李赛聂捷高如军左星
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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