SU1209704A1 - Reagent for calcium drilling muds and method of producing same - Google Patents

Abstract

14 Reagent for calcium drilling fluids, including phenol, PRS, formalin and water, in a tl l and y and, in order to increase the thermo solids resistance of drilling fluids, it additionally contains polyethylene terephthalate (PET) of general formula 5.0 -10.0 15.0-20.0 15.0-20.0 30.0-35.0 The rest is different-. with a molecular mass of (15-30.0) 10 in the following ratio of components, wt.%: Phenol PET Formalin PRS Water 2. The reagent according to claim 1, u and with the fact that as PET it contains or synthesis waste according to - polyethylene terephthalate, or knitwear production waste based on polyethylene terephthalate fibers. 3. A method for producing a calcium boring agent reagent, comprising mixing PRS with phenol and formalin followed by heat treatment of the mixture at 90-95.0 seconds, characterized in that it is pre-prepared at. heating the mixture of phenol and PET and formalin is introduced into it, the resulting reaction mixture is subjected to heat treatment for 40-45.0 minutes, then the PRS is introduced and the heat treatment is continued for 30-35.0 minutes. i (L o so

Description

one

The invention relates to drilling technology, in particular to drilling compositions and methods for producing reagents for the preparation of washing liquids, and may be used to treat saline drilling fluids.

The purpose of the invention is to increase the thermo salt resistance of the drilling fluid.

The invention is as follows.

In 50 ml of an 85% aqueous solution of denol heated to 50 ° C, 150 g of pre-ground polyethylene terephthalate are introduced and stirred for 30 minutes. After the polymer is dissolved, 150 ml of a 30% formalin solution are introduced into the mixture and the temperature of the resulting mixture is set to. After 40 minutes, another 300 ml of the PRS solution was added to the flask and the process was continued for another 30 minutes.

The reagent obtained in this way is a homogeneous dark brown liquid with a specific gravity of 1.14-1.16 g / cm of the following composition, wt%:

Phenol5.0

PET15,0

Formalin15,0

SSB30,0

WaterEverything

Calcium drilling mud with a specific gravity of 1.20-1.22 g / cm is prepared by diluting the bentonite paste with distilled water and stirring on a high-speed mixer at 3000 rpm. Prepared10

15

12097042

The solution thus treated is treated with a reagent.

Table 1 gives the technological properties of a calcium drilling mud treated with 5.0% by weight of the reagent in the presence of salts: 1.5% by weight of CaCl3 (0.5% by weight of CaOH) and 25.0% by weight of NaCe.

B Table 2 shows the data of the solution treated with the proposed reagent, obtained on the basis of the waste synthesis resin of Dacron with the content of the basic substance of 85.0 wt.%, With the indicated salt content; in table 3 - the same solution data, but with a basic substance content of 100% by weight. The data in Table 4 reflect the parameters of the calcium drilling mud as in Table 3, but after hydrothermal treatment.

As PET additives, waste obtained from its synthesis, as well as waste from knitted production of PET fibers, is used. The maximum content of PZTF in the reaction mixture is 85.0 wt.%. With a smaller PET content, oligomeric compounds with a reduced molecular weight increase in the final product (reagent-stabilizer), which leads to a decrease in stability of the resulting stabilizer reagent and thermal decomposition, especially in the presence of various electrolytes, causing a significant increase in water loss suspensions (up to 30-35.0 minutes and loss of its fluidity at elevated temperatures.

20

25

thirty

The original composition of calcium drilling mud

25.0 40.0, 35/47

Solution 1 + 4.0 reagents 31.0 11.0 38/67 - - + 5.0 - -34.0 7.0 43/72

table 2

Table 3

430 680 900

The initial composition of the calcium mud after thermostating at

Editor N. Egorova

Compiled by, Boriska

Tehred O. Niece Proofreader I. Muska

465/34

Circulation 644Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Continued table. 3

Claims (3)

1. The reagent for calcium drilling fluids, including phenol, CSP, formalin and water, characterized in that, in order to increase the heat resistance of drilling fluids, it additionally contains polyethylene terephthalate (PET) of the general formula with molecular weight (15-30.0) 10 ³ at the following ratio of components, wt.%: Phenol PETF Formalin PRS Water 5.0-10.0 15.0-20.0 15.0-20.0 30.0-35.0 Else 2. The reagent according to claim 1, characterized in that as PET it contains either waste synthesis of polyethylene terephthalate, or waste knitted production based on fibers of polyethylene terephthalate. 3. A method of obtaining a reagent for calcium drilling fluids, comprising mixing SSB with phenol and formalin, followed by heat treatment of the mixture at 9095.0 ⁰ C, characterized in that it is preliminarily prepared at. heating A mixture of phenol and PETP and formalin is introduced into it, the resulting reaction mixture is subjected to heat treatment for 40-45.0 minutes, then SSB is introduced and heat treatment is continued for 30-35.0 minutes.