Plugging cement paste system suitable for petroleum well repair of strata in Yayaozu

Abstract

The invention relates to the technical field of oil field well repair, in particular to a plugging cement paste system suitable for petroleum well repair of strata in Yayaozu. The cement paste systemconsists of dry powder and water. The dry powder comprises the following components in parts by mass: 100 parts of silicate superfine cement dry powder, 30 parts of G-grade silicate cement dry powder,10 parts of silicon powder, 0.6 part of flexibilizer dry powder, 0.6 part of expanding agent dry powder and 0.5 part of carbon fiber dry powder; the dry powder and water are blended into a slurry product with the density of 1.89 g / cm <3>. The plugging cement paste system is high in binding power, good in impact resistance, high in strength, good in performance, beneficial to on-site constructionand good in plugging effect; and the pressure test of a plugged well section can meet design requirements after plug drilling.

Description

Technical field:

[0001] The invention relates to the technical field of oil field workover, in particular to a plugging cement slurry system suitable for oil well workover in Yaojia Formation formation. Background technique:

[0002] Cement slurry is often used in well workover to block abandoned formations, block water channeling, block channeling layers, and strengthen the cement sheath outside the casing, etc. Seal formation: When reusing old wells in gas storage, use cement slurry to seal the abandoned perforation layer to block water channeling. After the cement slurry is solidified, the plugging layer is drilled and pressure tested to make the blasthole sealed to withstand a certain pressure and meet the conditions for wellbore reuse to meet production needs.

[0003] Conventional oil and gas well cement slurry used to block water channeling in layers often fails to meet the design requirements, and the pressure test after drilling the cement plug fails. For formatio...

Examples

Embodiment 1

[0021] Put 100 parts of Portland superfine cement dry powder, 10 parts of silicon powder, 0.6 part of toughening agent dry powder, 0.6 part of expansion agent dry powder, and 0.5 part of carbon fiber dry powder into a ball mill to grind to form a mixture. The mixture is mixed with 30 parts of G-grade Portland cement dry powder, and stirred with clean water to obtain a mixed slurry with a density of 1.89 g / cubic centimeter, which is the product.

[0022] According to the plugging radius and plugging thickness, inject this product into the formation through the wellbore, drill the cement plug after the cement solidifies, and complete the plugging construction after the wellbore pressure test is qualified.

[0023] For the strength test data of this product obtained in Example 1 (the gas storage requires a pressure test pressure of 14 MPa), the 683.6-687.2m / 619.2-621.2m / 617.6- 619.2m. Layered plugging, after drilling, the pressure test of 14MPa passed.

Technical field:

[0001] The invention relates to the technical field of oil field workover, in particular to a plugging cement slurry system suitable for oil well workover in Yaojia Formation formation. Background technique:

[0002] Cement slurry is often used in well workover to block abandoned formations, block water channeling, block channeling layers, and strengthen the cement sheath outside the casing, etc. Seal formation: When reusing old wells in gas storage, use cement slurry to seal the abandoned perforation layer to block water channeling. After the cement slurry is solidified, the plugging layer is drilled and pressure tested to make the blasthole sealed to withstand a certain pressure and meet the conditions for wellbore reuse to meet production needs.

[0003] Conventional oil and gas well cement slurry used to block water channeling in layers often fails to meet the design requirements, and the pressure test after drilling the cement plug fails. For formatio...

Examples

Embodiment 1

[0021] Put 100 parts of Portland superfine cement dry powder, 10 parts of silicon powder, 0.6 part of toughening agent dry powder, 0.6 part of expansion agent dry powder, and 0.5 part of carbon fiber dry powder into a ball mill to grind to form a mixture. The mixture is mixed with 30 parts of G-grade Portland cement dry powder, and stirred with clean water to obtain a mixed slurry with a density of 1.89 g / cubic centimeter, which is the product.

[0022] According to the plugging radius and plugging thickness, inject this product into the formation through the wellbore, drill the cement plug after the cement solidifies, and complete the plugging construction after the wellbore pressure test is qualified.

[0023] For the strength test data of this product obtained in Example 1 (the gas storage requires a pressure test pressure of 14 MPa), the 683.6-687.2m / 619.2-621.2m / 617.6- 619.2m. Layered plugging, after drilling, the pressure test of 14MPa passed.