SU1077913A1 - Method for preparing drilling mud - Google Patents

Description

The invention relates to the field of drilling wells, and more specifically to the preparation of water-based drilling mud. There are known methods for preparing a drilling fluid to bind hydrogen sulfide with Ct 3. However, in the drilling solutions obtained by this method, T-66 reagent does not act as a filtration reducer and builder, and therefore requires the addition of appropriate reagents. Closest to the invention is a method of preparing a drilling fluid by mixing a clay slurry with a stabilizer reagent, an electrolyte, and a special additive. Preparation of the beech solution according to the above method is as follows. The clay suspension is treated with a stabilizer reagent, electrolyte and thinned (barite). Next, waste is introduced into the solution at the stage of processing oil synthesis of dimethyldioxane during the production of isoprene rubber (reagent T-66) and thoroughly mixed with C2D. The disadvantage of this method is the high consumption of expensive stabilizer reagents (CMC, starch, CSSC, etc.) to maintain the required solution parameters. Moreover, with this method, the T-66 reagent does not in all cases play the role of a filtration reducer and structurant, which makes it difficult to effectively control the technological properties of the solution in the process of deep boreholes in complex geological conditions. The purpose of the invention is to increase the efficiency of regulating the structures of the no-mechanical and rheological properties of drilling fluids while reducing the consumption of the reagent-stabilizer. This goal is achieved by the fact that the method of preparation of drilling mud by means of blended. Before the introduction, the clay suspension with the stabilizer reagent and electrolyte and special additive is mixed with a special additive, which is used as waste from the processing stage of the aqueous layer of dimethyl dioxane (LV) synthesis or from the oil processing stage. dimethyl dioxane synthesis layer in the production of isoprene rubber (T-66) in an amount of 1-100 parts by weight clay suspension. In addition, in order to obtain an oil emulsion drilling mud, diesel fuel or oil in an amount of 515 parts by weight is introduced into the clay slurry. to the treated clay suspension. The waste of the stage of processing the aqueous layer of dimethyldioxane (LV) synthesis according to the technical conditions (TU 38 30371-79) of the Volga synthetic rubber plant is, wt%: Piran alcohol 0.5-1.8 Methylbutadiol-1, 315.0-22 , 0 The alcohol esters1, 6-4.2 A mixture of di oxane alcohols40.0-44.0 Water5.0-10.0 Dioxane diols and triols25, 0-29.0 A mixture of sodium salts of formic and acetic acid 0.5-1.0 DL confirmations of the proposed tool were tested drilling muds based on clay suspension from bentonite clay and fresh mud from well 7 Romanovsky, Prepared by the proposed method and known (table. 1). Mixtures 1-4, 7-24 were prepared using a new technology, i.e. T-66 (or LV), electrolyte reagents, stabilizers, diesel fuel were sequentially introduced and mixed into the fresh drilling mud or clay slurry. Then the solutions were thermostated for 1 h at 95-100 ° C. After cooling, the parameters of the solution were measured. Mixtures 5 and 6 were prepared in a known manner, i.e. T-66 (or LV) was injected into a clay slurry or a simple drilling mud, after all the additives. Within an hour, thermo solutionsJ10779134

stats at 95-100 0. After with mn 6 and 5, the parameters of cooling cooling were measured by the dissolving method.

ra. The mixtures 1 and 2 prepared by the results of the experiments were carried out by the method in comparison with the mixture in the table. f. Clay suspension 13 .13 20/40 1.10 Zi 10 7.0 2.5 1.08

Fresh solution from well 7

P

From tab. Figure 1 shows that according to the proposed method, mixtures 1 and 2 have less filtration and more SNA compared to mixtures 5 and 6. This allows maintaining the amount of solid phase in the solution at a lower level and thereby increasing the efficiency of controlling the parameters of the solution in the process . drills. In addition, the proposed method allows reducing the content of expensive stabilizer reagents without degrading the properties of the drilling mud (mixture of

3 and 4). In mixtures 7-16, the interval of additives or LP to the initial solution was determined. Lower limit

T-66 or LV supplements are 1% (mixtures 8 and 13). The value 100 is the upper limit (mixtures 10 and 3). Above this value, processing is economically non-feasible (a mixture of 10 and 16). In order to convert the drilling fluid into oil emulsion, diesel fuel was added in the amount of 5–15% (Table 2). Solutions 11-16 were prepared from freshwater drilling mud from well 7 of Romanovskaya, in which the solid phase is represented by plastic clays that went into solution during the drilling process, and is contained in an amount of 25 parts by weight. Solutions 17-19 contain bentonite in an amount up to 10 parts by weight. T is conditional viscosity; F - fsh1tra1Ts1; sleep — static shear stress; PV — plastic viscosity; HC - specific gravity; bottom - dynamic shear stress.

table 2

Claims (2)

1. A METHOD FOR PREPARING A DRILLING Mud by mixing a clay suspension with a stabilizing reagent, an electrolyte and a special additive, characterized in that, in order to increase the efficiency of regulating the structural-mechanical and rheological properties of the solution while reducing the costs of the stabilizing reagent before being introduced into the clay suspension stabilizer reagent and electrolyte it is pre-mixed with a special additive, which is used as a product of the processing stage of the oil layer synt for dimethyl dioxane or waste aqueous layer processing step in the production of the dimethyl dioxane synthesis isoprene rubber in an amount of 1100 parts by weight clay suspension. 2. The method of pop. 1, characterized in that, in order to obtain an oil-emulsion drilling mud, diesel fuel or oil is introduced into the clay suspension in an amount of 5-15 weight. hours to the treated clay suspension. ♦