Low density consolidation plugging agent

Abstract

The invention relates to a low-density consolidation type plugging agent. The low-density consolidation type plugging agent comprises the following components in parts by weight: 10-20 parts of calcium carbonate, 10-20 parts of shell powder, 20-30 parts of fly ash, 10-20 parts of floating beads, 10-20 parts of hollow glass balls, 0.1-1 part of sodium dodecyl sulfonate, 0.5-1 part of XC biopolymer, 0.5-1 part of polyacrylamide (PAM) and 1-5 parts of calcium hydroxide. A preparation method of the low-density consolidation type plugging agent comprises the following steps: adding the substances into a reaction kettle according to the contents, stirring and mixing for 6-8h at normal pressure and temperature of 40-55 DEG C, then adding into a dryer for drying, and then crushing to form a powdery product of 0.01mm-0.3mm. The low-density consolidation type plugging agent provided by the invention has the advantages of no environmental pollution, low density, a wide adjustable range, strong plugging capability, good flow property, certain coagulability, high success rate of plugging in low-pressure and easy-to-leak strata, scientific and simple process, and safety in construction, can be widely applied in petroleum and geological drilling processes, and is particularly suitable for dropout plugging of low-pressure dropout strata, as well as applications in broken strata and large-crack and carve type dropout strata.

Description

technical field [0001] The invention relates to a drilling lost circulation agent, in particular to a low-density consolidation type lost circulation agent. Background technique [0002] In oil drilling, diesel bentonite slurry, ordinary plugging slurry plus bridge plugging material, and clear water plus bridge plugging material are often used to plug leakage when drilling low-pressure leakage zones. Although these plugging methods solve temporary leakage, they also have the following disadvantages Or insufficient: ①The plugging slurry density is high and the adjustable space is small, so it is difficult to solve the problem of leakage in the low-pressure formation; ②Due to the low formation pressure, the density of the plugging slurry is high and it is difficult to adjust, which makes the plugging construction difficult and the plugging time is long. The leakage is becoming more and more serious; ③The above plugging methods have a certain effect on the plugging of some medi...

AI Technical Summary

Problems solved by technology

[0002] In oil drilling, diesel bentonite slurry, ordinary plugging slurry plus bridge plugging material, and clear water plus bridge plugging material are often used to plug leakage when drilling low-pressure leakage zones. Although these plugging methods solve temporary leakage, they also have the following disadvantages Or insufficient: ①The plugging slurry density is high and the adjustable space is small, so it is difficult to solve the problem of leakage in the low-pressure formation; ②Due to the low formation pressure, the density of the plugging slurry is high and it is difficult to adjust, which makes the plugging construction difficult and the plugging time is long. The leakage is becoming more and more serious; ③The above plugging methods have a certain effect on the plugging of some medium and low pressure leakage formations, but it cannot be solved when encountering low pressure formations and long openhole low pressure leakage; ④When adding inert materials, the density will increase, The plugging slurry added with bridge plugging materials is difficult to stay in the lost channel, which affects the plugging effect

⑤The plugging time is long, the density will become higher and higher, and the leakage will become more and more serious, resulting in repeated leakage and great economic losses