SU1682376A1 - Reagent for treating drilling fluids - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells and is intended for the washing of wellbores. The goal is to improve the quality of drilling fluids by increasing their lubricants while improving their structural properties. The reagent contains the following components at their ratio, wt.: Hydrocarbon phase 100; natural peat with a bitumen content of at least 2.5% (on a dry basis) 10-20. The reagent is prepared by thoroughly mixing the components until a homogeneous state. The reagent saves scarce reagents: clay powders, organic stabilizers. 4 tab.

Description

The invention relates to the drilling of oil and gas wells, in particular to the washing of a well bore.

The aim of the invention is to improve the quality of drilling fluids by increasing their lubricating and structural properties.

Example: In 100 g of oil (type I), 10 g of natural peat (on a dry basis) are stirred and thoroughly mixed until homogeneous.

For the preparation of the reagent, peat from four deposits is used, whose properties are presented in Table. one.

Different types of reagents were prepared similarly, containing a different hydrocarbon phase, which is prepared before entering the peat.

All tested reagents are given in table. 2, the effect of reagents on various types of solutions is given in Table. 3

In the experiments using reagents: SMAD (TU 38-1-192-68), tall oil pitch (OST 13-145-82).

In addition, the effect of partial dissolution of peat in a hydrocarbon liquid is used.

This effect is explained by the simultaneous natural hydrophobicity and hydrophilicity of peat, which allows this material to actively interact with the aqueous and hydrocarbon phases. In this case, the (hydrophobic) part of peat dissolves in the hydrocarbon phase, reducing filtration, and the fibrous particles ensure the growth of structural-viscous parameters and effective clogging of the formation, the consistent output of these materials does not allow to obtain the specified effect. In addition, the use of the proposed reagent does not increase, but reduces the alkalinity of the drilling fluid. In the known reagent humic substances,

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extractable with alkali and alkali itself cause swelling of the wells, rocks of the reservoir, coagulated in the presence of salts.

In order for the peat to disperse in the hydrocarbon phase, a certain amount of natural bitumen must be present in the peat. The minimum content of bitumen should not be less than 2, .0 wt.% Of the mass of peat. At lower bitumen contents, peat is poorly dispersed in the hydrocarbon phase. The upper level is not limited since the higher the bitumen content, the lower the filtration.

Table 4 shows the change in the wear rate of steel in an environment of 7% clay slurry under a load of 30 xrc / ivM without prf. treated with a mixture of oil and oil (reagent according to the table 2) (data in the numerator) and npv hourly input of peat v in the same quantities (in the denominator). These parameters characterize the ability of a mixture of peat with a hydrocarbon phase to improve the lubricating properties of drilling fluids.

Claims (1)

Invention Formula Reagent for treatment of drilling fluids containing a hydrocarbon phase and an additive, characterized in that, in order to improve the quality of drilling fluids by increasing their lubricating properties while simultaneously improving their structural properties, the reagent contains natural peat with a bitumen content of at least 2.5% in the following ratio of components, May. including: Hydrocarbon phase100 Natural peat with bitumen content not less than 2.5% (on Dry substance) 10-20 Table 1 2 3 4 5 6 7 table 2 15 15 15 15 10 2 four 10 10 GPAA 4 T-80 100 Kaolin 100 Sodium chloride 100 Water Else Rishev 1 CMC-700 5 Asbestos 2 Iron sulfate NaOH Water Else Solution 9 0.4 A solution of 9 + 1 OH oil + 4-3Z peat (4) Highly oxidized bitumen 150 Oxidized petrolatum 10 Diesel fuel Else  With and e and c. e. plastic viscosity; Ј „- dynamic shear stress; 9, / 9.0 - static shear stress for 1–10 min; F f f %% - filtration over 30 missions at 20 and 8 ° C, respectively. 25 15 22 1 2 3 4 8 4 4 eight ten 12 15 7 7 23 30 42 45 51 38 30 75 26 0.2 / 0.3 0.6 / 0.8 1.0 / 1.2 0.8 / 1.1 0.4 / 0.5 0.3 / 0.7 2.1 / 2.5 10/11 12 6 four four eight ten 3 ten sixteen ten eight 7 12 15 five 12 ABOUT with N3 GS 4 SP 5 6 7 8 15 12 18 Y. 8 120 39 35 54 32 29 28 18/26 25/31 31/39 18/20 2/2 7 7 4 12 10 o 9 8 5 15 14 2 3