Grouting mortar

FIELD: gas and oil industry.

SUBSTANCE: invention relates to grouting mortars used in cementing casing strings in gaseous, gas-condensate or petroleum holes in zone of productive seam at moderate temperatures. Proposed grouting mortar comprises the following components, wt.-%: grouting Portland cement, 64.41-66.24; sulfacell, 0.13-0.40; microsilica MK-85, 0.33-1.99, and water, 33.20-33.30. Invention provides preparing grouting mortar of reduced water yield in face conditions and with simultaneous enhance of strength of cohesion of cement stone with a casing string.

EFFECT: improved and valuable properties of grouting mortar.

1 tbl, 1 ex

 

The invention relates to cement mortars used in the cementing of gas, gas condensate or oil wells at moderate temperatures in the zone of the reservoir.

Known grouting mortar containing Portland cement, waste production silicon, calcium chloride and water /auth. St. No. 1832149, IPC EV 33/138, epubl, bull.№29/.

A disadvantage of the known cement slurry is increased yield and low adhesion strength of stone with the column.

Closest to the proposed composition and purpose is grouting mortar containing Portland cement, superplasticizer C-3, water-soluble hydroxyethyl cellulose, alfacell and water /Patent No. 213643, IPC EV 33/138, publ. 09.10.1999,/.

The disadvantage of this solution is the high fluid loss cement slurry in downhole conditions at high density and low effective flowing property, insufficient adhesive strength of stone with metal casing.

Increased density combined with low fluidity can cause absorption of cement slurry in cementing process and neopolyol cement to the design elevation. High values of water loss in downhole conditions can lead to significant hoteltravel fluid mixing and restaurantname salustiano cement slurry and also to nedoponyato cement mortar.

In the claimed invention solved the problem of improving the quality of the mounting casing in the interval permeable neftegazonosnyh layers.

The technical result of the invention is to develop a cement slurry normal density with reduced yield in downhole conditions while increasing the strength of adhesion of the cement to the casing string.

The solution of this problem is achieved by the fact that cement slurry comprising Portland cement, alfacell and water, unlike the prototype further comprises a fume MK-85 in the following ratio, wt.%:

Portland cement64,41-66,24
Alfacell0,13-0,40
Fume MK-850,33-1,99
Water33,20-33,30

In the experiments used fume MK-85 Chelyabinsk electrometallurgical plant THAT 5743-048-02495332-96, which is an ultra-fine material consisting of spherical particles (with a diameter of 0.25 μm or less), obtained in the process of gas purification furnaces in the production of silicon alloys. The main component material is silicon dioxide amorphous modification. Mick is kremnizer in the presence of moisture reacts with the cement to form calcium hydrosilicate, different more advanced spatial structure. Uncompensated charges fine microsilica form a connection with a water-soluble polymer, alfacell.

Alfacell - reagent, reducing sedimentation and water yield. Due to the nonionic nature of alfacell has a wide range of compatibility with other components produced according to TU 2231-013-32957739-01 CJSC polycell" Vladimir.

The mutual influence of the components on each other, their synergistic action in this composition allows to improve the physico-mechanical properties of cement slurry to lower the yield in downhole conditions at normal density and to increase the adhesive strength of the cement from the casing string.

In the presented experiments we used Portland cement PCT 1-100 according to GOST 1581-96 OJSC "Sukholozhskcement", alfacell on THE 2231-013-32957739-01 CJSC polycell" Vladimir, fume MK-85 on THE 5743-048-02495332-96, drinking water GOST 2874-82.

The definition of the main properties of cement mortar and stone was carried out at a temperature of 75±3°in accordance With GOST 26798.1-96 "Cement grouting. Test methods". The density of the cement slurry was determined by the pycnometer, the flowing - in cone of lubricant additives, the tensile strength of stone on a bend, on a test machine to the STAND-100, compressive strength and grip the metal - hydraulic press P-10.

Water flows in solution was determined on the tester M 7120 firm "Chandler Engineering" STO Gazprom EP 2.1-156-2005 at a temperature of 75°and the differential pressure 4.0 MPa.

The time of thickening of the solution was determined on the consistometer CZ-3 at a temperature of 75°and a pressure of 45 MPa according to GOST 26798.1-96.

Cement slurry was prepared as follows. Preparing a dry mixture of Portland cement and microsilica MK-85 in predetermined ratios. The required quantity alfacell was dissolved in water. Then the obtained solution stopped the dry mixture in mixer blade SL-1.

The solution prototype also prepared in the laboratory and measured its parameters - density, yield at moderate temperatures, the time of thickening, adhesion, missing in the description of the prototype.

Example. To prepare 1 kg of cement slurry (table, part 2), you must take 500 g of water and dissolve 0.4 g of alfacell, then prepare a dry cement blend of 980 g of Portland cement and 20 g of silica fume MK-85. The composition is stirred for three minutes, after which determine density, flowability. The solution is poured into the Cup of the consistometer CZ-3, in the assembled cylinder tester M 7120 and forms to determine the strength of stone on bending, compression and traction. Samples to the test time of Granat thermostat at a temperature of 75° C.

The prepared composition has a density equal to 1.82 g/cm3, spreading 235 mm, the thickening of up to 30 Bc - 202 min, yield 30 min - 429,6 cm3the adhesive strength of - 1.8 MPa.

Examples of the preparation and testing of other compounds listed in the table, the same algorithm.

To identify distinctive features and positive effect changed the mass ratio of components.

As can be seen from the table, the inventive cement slurry has a low yield in the conditions of moderate temperatures (declare 429,6 cm3and the prototype 1071,2 cm3), normal density (declare 1,82 g/cm3the prototype 1,89 g/cm3). The adhesive strength of stone with the metal of 1.7 MPa (part 2), and prototype 0.6 MPa.

The addition of microsilica MK-85 in the amount of 0.4 wt.% (8) leads to the reduction of water loss (160,1 cm3and high adhesion (1.8 MPa), but the solution has a low flowability (180 mm) and time of thickening 105 min - time is insufficient for the cementation process. The minimum number of microsilica MK-85 (7) does not allow to prepare the composition with reduced water yield (yield 542,8 cm3).

We offer cement slurry improves the quality of well casing due to the increase of the adhesion strength of the cement stone with metal is m casing, reducing water loss at high temperatures under normal density cement slurry.

1,82
Table
Physico-mechanical properties of cement slurries with microsilica MK-85 and alfacell at the test temperature 75°
№ p/pThe solution composition, wt.%Density, g/cm3Fluidity, mmThe thickening time of up to 30 Bc, minYield, cm330 minStrength, MPa, 2 days
cementMK-85alfacellwaterbendcompressiongrip
166,240,330,1333,301,82245281481,26,022,51,9
265,161,330,2733,241,82235202429,65,823,61,7
364,501,990,2733,24233182442,4the 5.720,41,8
464,411,990,4033,201,81225210204,75,622,51,8
Transcendent values
766,500,100,13for 33.271,82250300542,86,023,01,6
862,423,980,433,201,83180105160,14,312,41,8
The placeholder
68,35C-3 0,210,4231,021,891801201071,26,221,40,6

Cement slurry comprising Portland cement, alfacell and water, characterized in that it further contains silica fume MK-85 in the following ratio, wt.%:

cement portland.com is NT 64,41-66,24
alfacell0,13-0,40
fume MK-850,33-1,99
water33,20-33,30



 

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