A temporary plugging method and temporary plugging agent for tripping string construction in water injection wells
A technology for water injection wells and temporary plugging agents, which is used in earth-moving drilling, wellbore/well components, sealing/packaging, etc. It can solve problems such as high cost, slow construction progress, and inability to completely solve on-site problems, and reduce wellheads. The effect of overflow and reducing wellhead pressure
Active Publication Date: 2022-06-03
PETROCHINA CO LTD
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Problems solved by technology
The introduction of this technology has effectively solved the problem of depressurization of water injection wells, but the cost is relatively high, about 150,000 yuan for a single well under pressure, and the construction is complicated. Due to the influence of personnel, equipment, and costs, the construction progress is slow and cannot completely solve the problem on site. question
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[0025] The present invention will be further described in detail below with reference to specific embodiments, which are to explain rather than limit the present invention.
[0026] The present invention is a temporary plugging method used for the construction of pipe strings in water injection wells. After mixing the temporary plugging agent, water and suspending agent in a liquid dosing tank on the ground, the injection rate of 1-2 cubic meters per hour is carried out by a metering pump truck. The mixed liquid is injected into the perforation section of the water injection well, and then the well is shut in for a while, and the perforation section is blocked after the plugging agent is cross-linked. After 5 hours, open the wellhead of the water injection well and watch the wellhead overflow. If the wellhead pressure drops rapidly, and if the pressure is less than 1MPa within 0.5 hours, it is judged that the perforation section is effectively blocked.
[0027] The mass ratio ...
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The invention discloses a temporary plugging method and a temporary plugging agent for tripping and lowering pipe strings in water injection wells. Said include: According to reservoir porosity φ, perforation section thickness h and temporary plugging radius r a , determine the amount of temporary plugging fluid, and then determine the amount of temporary plugging agent, water and suspending agent; connect the ground pipeline, mobile injection device and liquid distribution tank in sequence, test the pressure, mix the temporary plugging agent, water and suspending agent and pass through The mobile injection device injects into the perforated section of the water injection well. The temporary plugging agent includes degradation agent, organic expansion monomer and thickener. The present invention mixes temporary plugging agent, suspending agent and water and injects them into the stratum through a metering pump truck, and a cross-linking reaction occurs to form a rubber plug to effectively block the perforation section, thereby reducing wellhead overflow, lowering wellhead pressure, and ensuring lifting and lowering Pipeline construction went smoothly. When the construction is over, after 72‑120 hours, the temporary plugging agent can be automatically degraded by the degradation agent, and the degradation products will not cause damage to the oil layer.
Description
technical field [0001] The invention belongs to the field of oilfield development, and in particular relates to a construction method for tripping a pipe string from a water injection well during water injection development, in particular to a temporary plugging method and a temporary plugging agent for tripping and tripping a pipe string from a water injection well. Background technique [0002] With the deepening of oilfield development, the amount of water injection well maintenance and measures to increase injection is increasing. Conventional string inspection operations use wellhead discharge and overflow, and the construction is carried out after reducing the pressure. This operation method has a long construction period (about 30 days). ), large amount of emptying water (2000-3000m 3 ), destroying the injection-production balance, wasting energy, polluting the environment and many other problems. With the gradual improvement of environmental protection requirements,...
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IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 陆小兵姚斌张随望王勇王尔珍邓志颖申晓莉侯金晔
Owner PETROCHINA CO LTD