Temporary plugging workover fluid for low-pressure carbonate reservoir gas well and preparation and application method of temporary plugging workover fluid
A carbonate rock reservoir and workover fluid technology, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling, etc. Realize problems such as temporary plugging and workover, and achieve good anti-swelling effect, reduce damage, and reduce water lock damage.
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Embodiment 1
[0075] G×-× gas well replacement damaged tubing workover operation
[0076] Firstly, calculate the required workover fluid density and dosage based on the formation pressure coefficient and wellbore structure of G×-× well; then, configure two workover fluid slugs; finally, carry out well killing and workover operations . The specific operation steps are as follows:
[0077] 1) Clean the liquid distribution tank, configure 8 m 3 Low solid phase water-locking type temporary plugging fluid slug and 180 m 3 Water-based anti-swell inhibitor slug.
[0078] 2) Check the blowout prevention pipeline. After passing the pressure test, release the pressure at the wellhead, and start to kill the well when the pressure drops below 5MPa.
[0079] 3) Inject a 5.0m water-based anti-swelling inhibitor slug from the oil jacket annulus 3 , and then inject a 5m slug of low solid phase water-locking temporary plugging fluid 3 , and then injected water-based anti-swelling inhibitor slug 25m ...
Embodiment 2
[0087] Lian × gas well bridge plug salvage and workover operations
[0088] Firstly, calculate the required workover fluid density and dosage according to the formation pressure coefficient and wellbore structure of the Lian× gas well; then, configure two workover fluid slugs; finally, carry out well killing and workover operations. The specific operation steps are as follows:
[0089] 1) Clean the liquid distribution tank, configure 5 m 3 Low solid phase water-locking type temporary plugging fluid slug and 150 m 3 Water-based anti-swell inhibitor slug.
[0090] 2) Check the blowout prevention pipeline. After the pressure test is qualified, the wellhead is ignited and blowout is started. When the pressure is released below 5MPa, the well killing will be carried out.
[0091] 3) Inject water-based anti-swelling inhibitor slug 3m from the oil jacket annulus 3 , and then inject a 5m slug of low solid phase water-locking temporary plugging fluid 3 , and then injected water-b...
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