Modified sheet rock mix

 

The invention relates to the oil and gas industry and can be used for cementing oil, gas and gas condensate wells. The technical result is to increase frost resistance and reducing the degree of degradation of the cement stone. Modified sheet rock grouting mixture including Portland cement, gypsum and gidrokarbonat calcium, it also contains jingikan in the following ratio, wt.%: Portland 50-96, gypsum 2-25, gidrokarbonat calcium 1,98-24,95, jingikan 0,02-0,05. table 1.

The invention relates to the oil and gas industry and can be used for cementing oil, gas and gas condensate wells.

Known sheet rock solutions foreign firms (Halliburton, Byron Jackson, Schlumberger and others), including Portland cement and gypsum at a ratio of from 50/50 to 60/40 [1]. Cement stone, formed from these mixtures is characterized by low resistance and frost resistance of cement, as well as its high degree of destruction. These factors have a negative impact on the quality of cementing and durability of the support hole.

The closest eucheuma Portland, gypsum and gidrokarbonat calcium - associated product complex nepheline ores on alumina [2] . The specified mix, although it does have a number of improved properties (zero voodoodoll, increased resistance and extension), but it is characterized by low resistance and a high degree of degradation of the cement stone. Taken together, these shortcomings reduce the reliability and durability well as structures in complex geocryological conditions of the Far North.

In the claimed invention solved the problem of improving the quality of attachment and reliability of the wells in the conditions of permafrost due to increase frost resistance and reduce the degree of destruction of the cement stone.

The technical result of the invention is to develop a cement slurry forming cement stone with high frost resistance and low degree of decomposition.

The solution of this problem is achieved in that the modified sheet rock grouting mixture including Portland cement, gypsum and gidrokarbonat calcium, it also contains jingikan in the following ratio, wt.%: Portland - 50-96 Gypsum - 2-25 Gidrokarbonat calcium - 1,98-24,95 Jingikan - 0,02-0,isovalues in the form of dark green rhombic crystals with a characteristic metallic sheen. Physico-mechanical properties: molecular weight 218,21, with a density of 1400 kg/m3the melting point of 171oC.

Preparation of sheet rock mixture in the factory is carried out on existing technology and is reduced to the dosage of the individual components with Poppet feeders or weight feeders and subsequent grinding in ball mills. Field preparation sheet rock mixture can be carried out using cementoossifying machines SMS-20, and hangeron is introduced into the liquid mixture, prepared with the help of cementing units CA-320.

Were prepared with the composition of the known sheet rock mixture comprising Portland cement, gypsum and gidrokarbonat calcium, and five trains a sheet rock grouting mixture according to the invention (Portland cement, gypsum, gidrokarbonat calcium and jingikan) when Vademecum respect 0,38 with boundary and an average grade components, as well as their contents below and above the boundary limits at a temperature of 02oC.

Determination of frost resistance was carried out in accordance with the methodology proposed in [3] the coefficient frost resistance, harakterizuyu the completed samples held during this period at a temperature of 5oC. the Degree of degradation of cement was estimated by the ratio of the strength of the samples in compression to tensile bending in a two-day age.

The test results presented in the table. The data obtained indicate that the proposed sheet rock compound with an optimal ratio of components has better properties than known, namely: - coefficient frost resistance increased on average by 25%; - the degree of degradation of the formed stone fell on average by 36%.

When the content of the components above the upper limit worsen the rheological properties of the solution, and when the content of component below the lower limit of the degree of degradation of the cement stone.

The increase frost resistance and reducing the degree of degradation of cement in the aggregate, contribute to the quality of attachment and reliability of wells under conditions of permafrost.

Sources of information 1. Century. And. Vyakhirev, A. C. Rudnitsky, A. A. Ryabokon and other Backfill materials and chemicals foreign firms//KBO. Inform. Ser. Drilling of gas and gas condensate wells. - M: IDC, JSC "Gazprom", 1997, - 44 C.

2. Patent 2127798 RF, MP the ski guidelines for the testing of backfill materials for the conditions of permafrost". - M.: the gas industry, 1982, - 32 C.

Claims

Modified sheet rock grouting mixture including Portland cement, gypsum and gidrokarbonat calcium, characterized in that it further comprises jingikan in the following ratio, wt. %:
Portland cement - 50 - 96
Gypsum - 2 - 25
Gidrokarbonat calcium - 1,98 - 24,95
Jingikan - 0,02 - 0,05 and

 

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1 tbl

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1 ex

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2 cl, 1 tbl

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2 tbl

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1 tbl

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.2
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2 tbl

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1 dwg, 1 ex

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1 tbl

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2 tbl, 4 ex, 2 cl

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