Complex powder composition for structured spacer fluid preparation

FIELD: gas and oil production.

SUBSTANCE: invention refers to structured spacer fluids with adjustable density, applied in separation of backfilling and drilling slurry of different composition and density and in efficient displacement of drilling slurry from well cementing interval with abnormally high bed pressure (AHBP). Complex powder composition for structured spacer fluid preparation includes, wt %: the rest is lignin-alkaline agent of fraction composition, % at mesh sieve: N 0.9 - 2.12; N 0.315 - 22.35; N 0.08 - 34.10, N 0.08 and others are the rest; 80.0-85.0, carboxymethyl cellulose 15.0-20.0, nitrylotrimethylphosphonic acid 0.01- 0.15 above 100%.

EFFECT: increased quality of well bore preparation for cementing, improved cement contact with string and rock, bed separation quality in wells with AHBP.

1 ex, 1 tbl

 

The invention relates to the fastening of oil and gas wells, in particular to structured buffer fluids with variable density.

Known powder mixture "Algum for preparation of buffer fluid and treatment of drilling mud, containing, wt.%: ogledaloto reagent 30-50 and reagent ECOTECH (vinylacetate with the addition of polysaccharide) - 50-70 (EN 2099504 C1, 20.12.1992).

The lack of buffer fluid prepared from such a composition is that it does not have the structural stability to carry the weight, providing the density of the buffer solution above 2.0 g/cm3and does not provide the adhesive properties of the cement stone with rock and casing pipe.

Known buffer the water-based liquid, comprising, in wt.%: ogledaloto reagent 8-12, carboxymethylcellulose - of 0.45 to 0.8, nitrilotriacetate acid - 0,02-0,05, weight - 0-70, water - other (RU 2199648 C2, 14.05.2001).

However, this composition does not provide a stable structure of the weighted buffer systems density of 2.0 to 2.35 g/cm3, is unstable rheological parameters (large precipitate of insoluble substances) and does not ensure complete sealing cemented space.

The invention aims to improve the functionality of the buffer fluid is directed to the section is of different composition and density of cement and drilling mud and the effective displacement of the last interval cementing wells with abnormally high formation pressure (AHP), by increasing the chemical activity of components.

The problem is solved in that the complex powder composition for preparing a structured buffer fluid containing the stabilizer - ogledaloto reagent, the amendment carboxymethylcellulose and nitrilotriethanol acid, characterized in that during simultaneous dissolution of the three-component composition ogledaloto reagent contains certain fractions, with the following ratio of components, wt.%:

Ogledaloto reagent80,0-85,0
Carboxymethylcellulose15,0-20,0
Nitrilotriacetate acid0,01-0,20, over 100%

Fractional composition phaselocked reagent is determined according to GOST 6613 and has the balance, % sieve: №0,9-21,2; №0,315-22,35; №0,08-34,10 and after No. 0.08 to rest.

The technical result is an increase in chemical activity of the buffer fluid is directed to the removal of clay and polymer films, the formation of a homogeneous structure capable of bearing weight, providing high density, sedimentation stability and low water flows in structures is one solution, giving the possibility to coat well with AHP.

This technical result is achieved due to the simultaneous dissolution, with the formation of a synergistic effect in the interaction of natural macromolecular substances phaselocked reagent specific fractional composition and organic components carboxymethyl cellulose, which is manifested in the fact that at higher concentrations the number of ionized groups phaselocked reagent (with carboxyl groups of cellulose ethers at a certain pH) decreases, macromolecules twisted, aggregated, and the initial viscosity increases linearly. The minimum molecular weight of the formed structural unit is more than 15000 nuclear units at four nitrogen atoms (created by the interaction phaselocked reagent, nitrilotriethanol acid), while dissolving the composition of the macromolecule strive to take the form of globules, while the dissolution only phaselocked reagent in water in a solution of macromolecules are formed in the expanded state, taking a linear form. This inventive composition is different from the prototype. Larger globules provide a homogeneous structure with stable properties of the buffer liquid, zero sedimentation at high t the particular buffer composition, which contribute to full substitution of the drilling fluid, thereby providing high adhesion of cement - stone, while preserving previously acquired properties (nezapushena mud and cement slurries in contact with the buffer liquid).

The composition was prepared by mixing components a certain humidity. The effectiveness of the composition was determined by experimental test data prepared from it buffer fluid, carried out by known methods.

An example implementation of the invention

Used USHR (ogledaloto reagent) TU 2458-008-20672718-0000; CMC (carboxymethylcellulose) TU 2231-001-53535770-01, NTF (nitrilotriacetate acid) TU 2439-347-05763441-2001. Take 1.2 g (12%) complete powder composition for preparing a structured buffer liquid, dissolved in 1 liter of water and add the weighting agent is barite 5.9 g (59%) (Example 1 (table 1, experiment 1)). Then check the resistance patterns weighted buffer fluid: sedimentation, water yield, viscosity and density of the resulting solution. Sedimentation is 0%. Yield - 6 cm3/30 min, a viscosity of 20 CP. The density of the solution - 2180 kg/m3. The adhesion of the cement stone: primary - 0, after processing is 2.2 MPa.

Analogously to example 1 was prepared in the inventive compositions ratios and tested it by known methods. With the relationship of the components and the test results are presented in the table.

As the weights can be: barite (example 1-3); magnesite (example 4-5); Magyar (example 6). From the data given in the table, it follows that the received buffer solution has a high sedimentation, low fluid loss, the necessary viscosity and high density (up to 2300-2350 kg/m3), which reduces filtereddata solution into the reservoir and ultimately improves the adhesion of the cement stone.

Determination of the viscosity of the buffer fluid. Equipment - laboratory stirrer any brand, providing the frequency of rotation of the shaft 5□0,2·-2(THE 22-D-3333-83), field viscometer ABR-1 (SST-5) (TU 25-04-2771-77).

The testing. To prepare 1 l of buffer liquid: 100 g of compound powder composition for preparing a structured buffer fluid mixed with 900 g of water. The mixture is stirred at a temperature of 23□2°C for 30 minutes electronically with a speed of 300 Rev/min, to measure the viscosity of the buffer fluid by using a viscometer ABR-1 (SST-5). To spend three dimensions. The arithmetic mean value of these measurements is taken for viscosity.

Sedimentation stability of the buffer fluid was assessed by the change in density after her weight. The liquid is poured into the sedimentation cylinder SP-2 and leave it alone. After 15 minutes, drain the upper and lower parts of the solution and determine Aut their density. The criterion for the buffer fluid is the difference between the densities of 0.1 g/cm3in 15 minutes.

The use of the inventive complex powder composition for preparing a structured buffer fluid will improve the quality of training of the wellbore for cementing, strength contact cement with string and rock, as zonal isolation in wells with abnormally high formation pressure.

Integrated powder composition for preparing a structured buffer fluid containing ogledaloto reagent, carboxymethylcellulose and nitrilotriacetate acid, characterized in that the simultaneous dissolution of the three-component composition contains ogledaloto reagent fractional composition of residue, % sieve: № 0,9-2,12; № 0,315-22,35; № 0,08-34,10 and after No. 0.08 to rest, with the following ratio of components, wt.%:

Ogledaloto reagent80,0-85,0
Carboxymethylcellulose15,0-20,0
Nitrilotriacetate acid0,01-0,15 over 100



 

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1 tbl

Drilling mud // 2268909

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2 tbl, 3 ex

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2 tbl, 2 ex

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4 tbl

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2 cl, 2 tbl, 6 ex

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2 cl, 2 tbl, 6 ex

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2 tbl

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1 tbl

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2 cl, 15 ex

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2 cl, 1 ex

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