A Horizontal Well Fracturing Test Gas Completion Technology Using Completely Dissolvable Bridge Plug

Abstract

The invention discloses a horizontal well fracturing gas testing and well completion technology adopting a completely dissoluble bridge plug. The technology comprises the following steps: (1) a shaft is prepared; (2) a perforating gun is conveyed by coiled tubing for first-section perforation; (3) first-section fracturing operation is performed; (4) a cable connecting tool string connected with a perforating gun string and the ball type completely dissoluble bridge plug is pumped into the downhole; (5) first ignition is performed to set the completely dissoluble bridge plug; (6) second ignition is performed to detonate the perforating gun to shoot through a casing pipe and communicate the shaft with a reservoir; (7) the steps (4), (5) and (6) are repeated sequentially; (8) the cable connecting tool string is connected with the full-seal type completely dissoluble bridge plug, the full-seal type completely dissoluble bridge plug is pumped into the well, ignition is performed for setting, a gas production wellhead is mounted under a non-pressure condition, and a completion pipe string is descended to finish the horizontal well fracturing gas testing and well completion work; (9) the bridge plug can be degraded and dissolved within 7-14 days, and then operation is shifted to a production stage. The construction period is shortened greatly, the complex degree of the technology is reduced, and the well control safety risks are reduced.

Description

technical field [0001] The invention relates to the field of development of unconventional oil and gas resources, in particular to a horizontal well fracturing gas test completion process using a completely dissolvable bridge plug. Background technique [0002] In the development of unconventional oil and natural gas (including shale oil, shale gas, tight oil and gas, etc.) resources, three key technologies ensure that unconventional oil and gas resources can complete fracturing, test and gas completion operations, including: [0003] (1) Horizontal well bridge plug staged fracturing technology: In the staged fracturing process of horizontal well bridge plug, the drillable composite bridge plug and perforating gun string are used under the cable, the bridge plug is set and released, and the upward shot The perforation gun is fired at the perforation position, and the fracturing operation is carried out after the perforating gun string is pulled out, and then the above steps ...

AI Technical Summary

Problems solved by technology

If the debris is not circulated out of the wellbore in time to cause accumulation, or the debris is too large to be circulated out of the annulus between the drilling and grinding tool and the casing, resulting in the drilling and grinding tool being stuck, repeated drilling and grinding cycles are required, not only It increases the risk and workload of the drilling operation, and even causes the risk of the drilling and grinding tool string falling into the bottom of the well; at the same time, a large amount of drilling fluid is sometimes used during the construction process, which increases the construction cost of the liquid

[0009] (3) Due to the development of unconventional oil and gas reservoirs, the horizontal section of the horizontal well is between 800-2000m long, and the drilling pressure of the bottom hole drilling tool is low. It is possible that the drilling pressure of the drilling tool at the end of the horizontal section is not enough to complete the remaining bridges. plug drilling

[0010] (4) During the drilling and grinding process of the horizontal section, the grinding shoe on the tool string is in contact with the casing of the oil and gas well, which is easy to cause damage to the casing body, thereby reducing the strength of the casing and the stability of the wellbore structure, and bringing new benefits to the later construction. Wellbore Operation Risk

[0011] (5) During the drilling and grinding process of the horizontal section, it is necessary to drill and grind multiple bridge plugs, and the coiled tubing has to be pulled up and down many times due to the complex working conditions downhole, and sometimes the motor and grinding shoes on the drilling and grinding tool string need to be replaced. Increased construction period and operating costs

[0012] (6) After the drilling and grinding operation of the horizontal section is completed, the completion of the production tubing needs to be completed under pressure at the wellhead, and the well control safety risk is high and the operation cost is high

[0013] (7) When drilling plugs and well completion operations under pressure, a large number of ground-related equipment is added, resulting in high equipment rental service costs; and additional hoisting operations, installation into wells, and pressure operations are complicated, which also increases the cost of the well. control security risks

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