SU1470758A1 - Drilling fluid composition - Google Patents

Abstract

This invention relates to the field of well drilling in the exploration and petroleum industries. The purpose of the invention is to increase the efficiency of destruction and clean-up of the wells by reducing the conditional viscosity of the drilling mud and increasing the instantaneous water loss. The drilling fluid contains the following ingredients, wt%: bentonite 2-5, starch 4-5, sodium hydroxide 0.5-1.0, resin containing methyl groups 30-34% 6-10, water the rest. The resin with a content of methyl groups of 30-34% is carbamide resin KS-11, which is a viscous liquid with a solids content of 62%. Sodium hydroxide, starch and gum are dissolved in water to prepare the solution. Then the resulting solution is mixed with a bentonite suspension. The use of a urea resin with a content of methylol groups of 30-34% in the solution provides a low conditional solution capacity and high instantaneous yield, which leads to an increase in the efficiency of rock destruction at the bottom of the well and its removal from sludge. The use of the solution reduces the cost of well construction. 1 ill., 1 tab.

Description

The invention relates to the field of drilling wells in the exploration industry of the oil industry and is intended for flushing them.

The purpose of the invention is to increase the efficiency of destruction and cleaning of the bottom hole by reducing the conditional viscosity of the drilling fluid and increasing instantaneous water loss.

Drilling fluid contains, in May.%:

Bentonite2-5

Starch4-5

Sodium hydroxide Resin with a methylol content of 30-34%. Water

0.5-1.0

6-10 Else

 sd

00

As a carbamide resin with a methylol group content of 30-34%, KC-I1 resin is used, which is a viscous liquid with a density of 1160 kg / m and a viscosity of 15 sec according to VZ-1. It contains 62% dry matter, 4% free formaldehyde

30-34% of methylol groups and has a pH of 8.5.

The preparation of the drilling fluid is carried out in a known manner. For this purpose, the calculated amounts of sodium hydroxide, starch, and carbamide resin KS-P are dissolved in one part of the required mass of water, and then

U707584

pp PH-340, daily sludge using a 100 ml measuring cylinder, nondispersive properties using a sedimentary analysis to estimate the density function of the distribution of particles of bentonite of a certain size.

The instantaneous yield on the VM-6 device is determined by the method, the included solution is mixed with a bento-0 using the graphic

nitrous suspension prepared from the remaining mass of water and the estimated amount of bentonite, not subjected to hydration and dispersion.

Example 1: 500 g of water is dissolved in 5 g of sodium hydroxide, 40 g of starch and 60 g of KS-11 resin with a methylol content of 30%, and in 375 g of water, 20 g of bentonite are added and mixed to obtaining a homogeneous suspension. The starch reagent obtained and the bentonite suspension are mixed and stirred until a homogeneous solution is obtained. Prepared drilling mud has the following composition, wt.%; bentonite 2 | starch 4J sodium hydroxide 0.5; KS-11 6; water is 87.5. It is characterized by the following parameters: П 1050. УВ 43 cj.Bjo 4 cm В 0.5 cm; sleep, / 40 0/13 dPa; С „, 0; pH 9, 1.0 g; Gd. 1.5;

15

20

25

 thirty

-3.

;

 100

3.5 and

415

1.8% / MKM through

1 hour stirring: g. 0.4, g

8s

 35

0.8; g, 00 2.9 and g, 1.0% 7 microns after 4 hours of mixing the drilling mud.

The following conventions are assumed: p - density; HC — conditional viscosity; B - water loss for 30 in; B - instantaneous loss of water; ATP 1 — static shear stress after 1 and 10 min; C - daily sludge; r-, r, r and rj are the density of the distribution of particles with an average radius of 70, 85, 100 and 115 µm, respectively.

Experimental work on the evaluation of the technological properties of the drilling fluid was carried out by evaluating the compaction of commonly measured characteristics using conventional techniques and instruments. Density is measured by the pycnometric method, the conditional viscosity is measured using the WWR-1 funnel, the water loss on the VM-6 instrument, the static shear stress on P1 and the BCH-3 sampler, and the pH is adjusted by means of the instrument.

For example, the determination of instantaneous water loss in example 3: (see table is carried out in a similar way.

In the process of measuring the water loss by the stopwatch, the time intervals during which the water loss reaches I, 2, 3, and .4 cm are noted. They are respectively 3, 5, 9, 18.5, and 43.5 minutes. Paramilitary points are plotted on a graph in the coordinate system of water loss - time.

The drawing shows a graph in the coordinate system of water loss - time.

Through points 1-4, a curve is drawn. From the origin of coordinates to this curve, a tangent Q is carried out. A linear portion of the curve (from the origin of coordinates to point 1) 5 which is cut off by a tangent corresponds to the magnitude of the instantaneous water loss, which is determined from the graph and is in cm. The water loss in 30 minutes is also determined according to the schedule (point 5) and is 3.5 cm.

The results of the investigation of the solutions are given in the table.

Analysis of the data obtained shows the following. When the content in the drilling mud ingredients, wt. % bentonite 2-5; starch 4-5, sodium hydroxide 0.5-1; KS-P 6-10 (examples 1-5), the conditional viscosity is 45 40-45-C, and the moisture loss is 0.5-1.0 cm, It. It indicates that the viscosity is lower, and the instantaneous yield is higher than the similar parameters of the known JQ drilling mud (examples 8, 9) (which constitute DO-75 and O c, respectively, which contributes to a decrease in conventional and increase instantaneous water loss.

The remaining technological parameters of the drilling mud: p

 1-050 kg / m 3-4 cm SNS ,, about 0/16 dPa; Co 0; pH 9-10 - correspond to the parameters of the known rast5

0

five

0

five

way.

For example, the determination of instantaneous water loss in example 3: (see table is carried out in a similar way.

In the process of measuring the water loss by the stopwatch, the time intervals during which the water loss reaches I, 2, 3, and .4 cm are noted. They are respectively 3, 5, 9, 18.5, and 43.5 minutes. Paramilitary points are plotted on a graph in the coordinate system of water loss - time.

The drawing shows a graph in the coordinate system of water loss - time.

Through points 1-4, a curve is drawn. From the origin of coordinates to this curve, a tangent Q is carried out. A linear portion of the curve (from the origin of coordinates to point 1) 5 which is cut off by a tangent corresponds to the magnitude of the instantaneous water loss, which is determined from the graph and is in cm. The water loss in 30 minutes is also determined according to the schedule (point 5) and is 3.5 cm.

The results of the investigation of the solutions are given in the table.

The analysis of the obtained data shows the following. When the content in the drilling mud ingredients, wt. % bentonite 2-5; starch 4-5, sodium hydroxide 0.5-1; KS-P 6-10 (examples 1-5), the conditional viscosity is 40-45 ° C, and the apparent yield is 0.5-1.0 cm, This. It indicates that the viscosity is lower, and the instantaneous yield is higher than the similar parameters of the known drilling mud (examples 8, 9) (which respectively make DO-75 and O c, which contributes to a decrease in the conditional visibility of the drilling mud and instant water loss.

The remaining technological parameters of the drilling mud: p

 1-050 kg / m 3-4 cm SNS ,, about 0/16 dPa; Co 0; pH 9-10 - correspond to the parameters of the known plant 1470758

1050-1080 kg / m; AT

; SNS ,, 0/20 dPa; C 0 „

ba me ns sve 1 ru

The non-dispersive properties of this drilling fluid (g

6 through

100

l.5; g, oo

1 h and g

then t

 3.5; 0.4; g

 2.9; r ,, g -1.0 through

 1.0; , 15 J. S 8S

0.8; 4h)

correspond to the properties of a known solution: g 1,0; g. 1.6; .

oh that

15 as

3.8; g

115

1.8 after 1 h and 0.7; g, oo 3,0;

0.3; GDZ

 1.1 through 4 hours). Also, in the well-known, in this drilling mud, dispersed particles with a radius of 16-18 microns were not detected. This indicates the preservation of non-dispersive properties.

With an increase in the content of KS-11 resin in the drilling fluid within b-10 wt.%, An increase in the instantaneous filtration from 0.0 to 1.0 cm is noted (examples 1, 2, 4, 5), and with its content exceeding 10 wt.% instant

filtration does not increase (example 7). This indicates that it is not feasible to increase the content of KS-1 1 to more than 10% by weight. With a decrease in the content of the resin KS-11 relative to 6 wt.%

an increase in viscosity is noted in example 6), in addition, there is an increase in water loss of up to 4.5 cm and a momentary water loss to zero. It testifies

It is not appropriate to reduce the content of KS-11 below 6 wt.%.

Thus, the use of carbamide resin KS-11 with a methylol content of 30–34% reduces the mud viscosity from 60–75 to 40–45 s and increases the instantaneous yield from zero to 0.5–1.0 cm while maintaining non-dispersive properties.

Claims (1)

0 Economic efficiency from the application of the proposed drilling mud can be achieved by increasing the mechanical drilling speed, reducing the cost of 5 times to combat complications, as well as reducing the consumption of reagents. Formula of Invention Drilling fluid containing bentonite, starch, sodium hydroxide, Q carbamide resin and water, so that, in order to increase the efficiency of destruction and clean-up of the well by reducing the conditional mud viscosity and an increase in instant water loss, as a carbamide resin, the drilling fluid contains a resin with a methylol content of 30–34% with the following ratio of ingredients, wt.%: Bentonite 2-5 Starch .-. 4-5 Sodium hydroxide 0.5-1.0 Resin with by methyl 5 groups of 30-34% 6-10 WaterEverything five 0 ooooooo ON ON ON ON ON ON ON ON E c jtscMr ic eMcvino OO 00 CO 00 00 00 00 t r SE about cT about SE EO o O about oh se sg oh oh oh oh ooooooooooooooooooo 1Л1Л1Л1Л «ЛЩ1Г | 0000 co r go go co no co no co 1Л1Г | Ю1ЛЮ1ЛЮЧО X) ooooooooo ChCTi "CCOiOOiO OCH „-, - oososoooo fOCMin CU- - nCO - - - cm Cv | ossssooos 1LS SG- - SG-with - about with inu- -d - a-fOcOfO4rM-.n COC4rir CSO SOlO O1L1LShOOOOOO iniri or oou-iooin "ooooooooooo O о 00 о о Ю - VO о inr ooiriom oh oh oh s ) to Id  - G1L1L- Yu- 1G | u a l be: MF cm SO1G | 1LG 1 l / ICM 1L - t4-tn- invor ooo J, 5 9 Yu Ц52030 , fit / H . . l 0 3.5