CN101693827A - Coagulation composite sealing agent - Google Patents

Abstract

The invention discloses a coagulation composite sealing agent, which comprises components in percentage by weight: sodium silicate 3-6, potassium silicate 2-4, magnesium oxide 10-20, calcium carbonate 20-30, shell powder 15-30 and calcium oxide 5-10, which are evenly mixed and stirred under normal temperature and pressure. The invention is characterized by repairing and coagulating fractures, not bearing the pressure of leakage stratum well walls, being capable of freely pumping, forming concretion substances coagulated on easy broken well walls of leakage channels and leakage fractures and the like. The sealing agent is extensively applicable to petroleum and geology boring projects, in particular to application in bearing and leak-stopping processes of low-voltage brokenness stratums, reef limestone stratums and fracture stratums.

Description

Coagulation composite sealing agent

One, technical field

The present invention relates to drilling plugging agent, particularly a kind of coagulation composite sealing agent.

Two, background technology

The processing of leakage is the great technical barrier in the petroleum drilling, and it is particularly thorny that particularly complicated leakage is lost problem.Conventional plugging agent is generally chemical gel leak stopping methods such as the leak stopping of bridge slurry, bridging plug leak stopping, the leak stopping of diesel oil bentonite slurry, though also play a role, has following shortcoming or deficiency: 1. when blocking construction, can't condense and repair the leakage stratum borehole wall.2. for ravelly ground, the leakage that easily collapses stratum particularly during the stratum of low pressure cementing properties difference, can not be repaired the ravelly ground borehole wall and condense; 3. behind the blocking construction, bearing capacity is low, and plugging effect is poor, causes the repeated multiple times leak stopping, thereby has directly reduced the pressure-bearing plugging effect of ravelly ground, so that influence subsequent job operation and oil production.

Three, summary of the invention

The purpose of this invention is to provide a kind of coagulation composite sealing agent, the plugging agent that employing has the shutoff of condensing, repairs ravelly ground, bonding capacity is strong, the shortcoming or the deficiency that overcome effectively or avoid existing in the above-mentioned prior art, improve ravelly ground pressure-bearing plugging effect effectively, increase substantially drilling speed, reduce drilling well and always drop into.

Coagulation composite sealing agent of the present invention, its composition and content are weight part:

Water glass 3-6; Potassium silicate 2-4; Magnesium oxide 10-20; Lime carbonate 20-30; Oyster shell whiting 15-30; Calcium oxide 5-10

Compound method: the material of above-mentioned component, mixing and stirring gets final product at normal temperatures and pressures.

The present invention has following advantage or beneficial effect compared with prior art:

1, have the very strong function of condensing, can well repair the ravelly ground borehole wall.

2, have very strong shut-off capacity, can be used for the low pressure weak zone, but shutoff slit formation stratum again.

3, have certain intensity after condensing, can improve the bearing capacity on broken leakage stratum.

4, good rheological property, sealing ratiod height, the performance of condensing is adjustable.

5, the leak stopping slurries condense after can entering the drop ply certain depth, have glued reinforcement ability simultaneously;

6. nontoxic, pollution-free, construction safety, simple, easy to operate, the leak stopping success ratio height of preparation.

Five, embodiment: a kind of coagulation composite sealing agent, its composition and content, content are weight part:

Water glass 3-6; Potassium silicate 2-4; Magnesium oxide 10-20; Lime carbonate 20-30; Oyster shell whiting 15-30; Calcium oxide 5-10

Compound method: the material of above-mentioned component mixing and stirring at normal temperatures and pressures gets final product.

Provide following specific embodiment below, its component and content, content are weight part:

The 1st example

Water glass 3 potassium silicates 2 magnesium oxide 10 lime carbonate 20 oyster shell whitings 15 calcium oxide 5.Mixing and stirring at normal temperatures and pressures.

The 2nd example

Water glass 4 potassium silicates 3 magnesium oxide 15 lime carbonate 25 oyster shell whitings 20 calcium oxide 6.Mixing and stirring at normal temperatures and pressures.

The 3rd example

Water glass 5 potassium silicates 3.5 magnesium oxide 18 lime carbonate 28 oyster shell whitings 25 calcium oxide 8.Mixing and stirring at normal temperatures and pressures.

The 4th example

Water glass 6 potassium silicates 4 magnesium oxide 20 lime carbonate 30 oyster shell whitings 30 calcium oxide 10.Mixing and stirring at normal temperatures and pressures.

Wherein, the 1st example, the 2nd example, the 3rd example are embodiment, and the 4th example is a comparative example.

Claims (1)

1. coagulation composite sealing agent, its component and content, content are weight part:

1. water glass 3-6

2. potassium silicate 2-4

3. magnesium oxide 10-20

4. lime carbonate 20-30

5. oyster shell whiting 15-30

6. calcium oxide 5-10