SU1239272A1 - Buffer fluid - Google Patents

Description

 ..

The invention relates to the drilling of oil and gas wells, in particular, to buffer liquids used in casing cementing.

The purpose of the invention is to increase the heat resistance and the sedimentation stability of the buffer fluid.

The technology of preparation of the proposed buffer liquid does not differ from the technology of cement mortar preparation: the calculated amount of water is added to the estimated amount of lignosulfonates and porous granulated sand with a grain size of 110.-mm, after which the mixture is stirred.

Table 1 shows the compositions and indicators of buffer liquids.

The composition and properties of drilling fluids are given in table 2.

The results of laboratory studies - show that. By heat resistance Table

. ,, “... - - -. - .--,“

The content of components, wt.%

The proposed composition

40 0.5. - 0,5

50 1.5 - 0.75

60 2 - 1, 5

Known composition

0.3

39272 2

For bone and sedimentation stability, we offer a buffer liquid that far exceeds the known,

Table 3 shows the experimental data, 5 showing the nature of the compatibility of the proposed buffer fluid with various drilling fluids.

V. Unlike the known buffer fluid, when mixed with drilling 10 solutions, density and static

the voltage of the proposed buffer fluid does not increase.

Data showing the nature of the compatibility of buffer liquids with 15 cement slurries are given in Table 4.

Tests on the determination of the time to thicken the mixtures of the buffer fluid with various cement mortars 20 show that the addition of the proposed buffer fluid in all cases does not shorten the thickening time. cement mortars.

59 47 36

31

14

55

The proposed composition of 1300 24 20/24; 40

1450 23 2.7 / 3.7 28. 1580 23. 3.2 / 4.5 18 Known composition

Continuation of table 1

1300 22.8 23/27 30 1450 22 3.2 / 3.8 21 1580 21.7 3.7 / 4.8 13

Table 3

95 50 25 95 50

Editor N. Tupitsa

Compiled by V. Boryshina Tehred O. Sopko

Order 3365/27 Circulation 548 Subscription

VNIIPI USSR State Committee

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

Production and Printing Project, Uzhgorod, Projecto st., 4

Table 4

Proofreader M..Sharoshi

Claims (1)

BUFFER LIQUID, containing a stabilizing reagent, structure-forming and erosive additives and water, characterized in that, in order to increase the heat resistance and sedimentation stability of the buffer liquid, porous granulated expanded clay sand is used as structure-forming and erosive additives, and lignosulfonates as stabilizing reagent the following ratio of components, porous granular expanded clay sand Lignosulfonates Water May. /about 40-60 0.5-2 The rest. SU, 1239272