DE2927420A1 - QUICK-BINDING, DRY, CEMENTING MIXTURE FOR ELIMINATING COMPLICATION ZONES IN DRILLING HOLES AND METHOD FOR THE PRODUCTION THEREOF - Google Patents

Description

1. Territorialnoe geologicheskoe upravlenie tsentralhykh raionov - Moscow, USSR

2. Severo-Zapadnoe territorialnoe geologicheskoe upravlenie - Leningrad, USSR

Quick-setting, dry, cementing mixture for the elimination of complication zones when drilling

of wells and methods of making them

The invention relates to the drilling of wells, and more particularly to a quick-setting, dry, cementing mixture for the elimination of complication zones when drilling boreholes and on a method for its manufacture.

The invention is for use in practice of geological search work, mining investigations, oil and gas extraction work and Blasting work intended to eliminate zones of geological complications associated with the uptake of flushing water, the water inflow or with a volatile Borehole area are connected.

909804/0771

A quick-setting, dry, cementing mixture for the elimination of complication zones in the drilling of boreholes, which on the Base made of a powdered gypsum cement binder which contains 40-50% by weight of calcium aluminate cement and 50-60% by weight of gypsum or alabaster (see e.g. Collection of scientific works of the scientific all-union research institute for methodology and technology of the explorations "Methodology and Technique of Explorations", No. 114, 1974, Leningrad, pp. 67-69).

The known mixture is intended to be fed into the complication zone in the dry state to it to be processed directly in place of the mixture application on the borehole walls to form a lining.

After the mixture has been processed in the borehole to form the casing, the drilling tool is removed from the Borehole taken out to feed a new portion of the quick-setting mixture or the other Carry out sinking of the hole.

When the boring tool is removed there is a piston effect, i. H. is created under the tool Dilution, which causes the pressure gradient of the fluid that is inside and outside the liner is located.

A high hydrostatic pressure is maintained outside the liner, inside the liner

909324/0771

but it diminishes.

One-sided pressure promotes the destruction of the lining, as the quick-setting mixture that makes up the lining is shaped, does not have the required rapid strength absorption and sufficient adhesion, i.e. has the ability to bond with the types of rock that form the borehole walls.

The piston effect can lead to complete separation the lining from the borehole walls and from the Cracks lead.

Vibrations and purging of the pressure in the medium as a result of the rotation can lead to a similar result of the drilling tool and the drilling columns when drilling the fast-setting, cementing mixture with the known composition that lead to the inclusion the required strength of the lining to eliminate the complication zones in a few minutes not guaranteed.

In addition, the quick-setting, dry, cementing mixture quickly loses its activity on storage, what is caused by a mutual action of cement and plaster of paris with the moisture that is in the surrounding Air is conditional.

The well-known quick-setting, dry, cementing Mixture for eliminating zones of complication when drilling boreholes is obtained by mechanical means Mixing the powdered cement and gypsum or

809884/0776

Alabaster proportions taken in the stated ratio.

However, this method of mixing does not ensure the required uniformity of the distribution of Cement and plaster or alabaster in the entire volume of the mixture, which leads to the destruction of the structure of the Artificial stone of the malleable lining, for leaching the lining material and, as a result, for destruction whose hermetic closure leads to within a short time (on the second or on the third day).

In addition, the existing technology does not allow the known dry mixture to be processed Improvement in quality of the latter due to the impossibility of introducing necessary additives in small quantities and distribute them evenly throughout the volume of the mixture.

The invention is based on the object of a quick-setting, dry, cementing mixture for removal of complication zones when drilling boreholes and to develop a process for its production by introducing necessary additives and their uniform distribution, the required speed of strength absorption of the mixture, high adhesion to rock types that form the borehole walls and a long shelf life when stored under unfavorable conditions Conditions are secured.

This object is achieved in that the quick-setting, dry, cementing mixture for removal of complication zones when drilling boreholes, which is based on a powdery gypsum cement binder

909834/0776

is made, the 40-50 wt.% cement and 50-60 wt.% or contains alabaster, according to the invention 0.01-3.0% by weight

Contains barium hexaferrite powder with particle sizes,

which are comparable to the dimensions of the binder particles

It is advisable to add 5-15% by weight of silica gel to the mixture to introduce.

The invention also relates to a method for producing the mixture in which the gypsum cement binder by mechanical mixing of the powdery cement and plaster or alabaster components which are taken in an appropriate ratio, marked that according to the invention the mixing is carried out under the conditions of an electromagnetic alternating field, barium hexaferrite powder additionally introduced by rubbing the working organs and, as such, magnetized granules based on barium hexaferrite can be used.

It's functional. Use granules that are perfect are made from barium hexaferrite.

It is no less expedient to use granules, which are made of barium hexaferrite with inert additives.

It is also expedient to use some of the granules which have increased rubability.

$ 103684/077

ORIGINAL INSPECTED

2927A2Q

The quick-setting, dry, cementing mixture according to the invention for eliminating zones of complication when drilling wells and the method for its production ensure the necessary speed of strength absorption, a high one Adhesion to the rock types that make up the borehole walls, as well as a long shelf life in storage under unfavorable conditions.

The quick-setting, dry, cementing mixture for the elimination of complication zones when drilling Boreholes is made on the basis of a gypsum cement binder, which contains 40 - 50% by weight cement and 50 - 60% by weight Contains plaster of paris or alabaster, and also contains 0.01 to 3.0% by weight of barium hexaferrite powder with particle sizes which are comparable to the dimensions of the binder particles.

A mixture that contains less than 0.01% by weight of barium hexaferrite contains, does not ensure the required strength and adhesion characteristics.

The introduction of more than 3.0% by weight of barium hexaferrite in the mixture significantly lengthens the onset of setting and decreases strength.

The mixture can additionally contain from 5 to 15% by weight of silica gel, which can be added to the mixture both in the form of a Powder as well as in the form of granules can be introduced.

809884/0775 ORlGJNAL INSPECTED

2927A2Q

The introduction of silica gel extends the shelf life of the mixture.

The said quick-setting, dry, cementing Mixture for eliminating zones of complication when drilling wells is obtained as follows.

Powdered cement and plaster of paris (or alabaster) that are in a required ratio is taken, mixing is carried out in a chamber under the conditions of an electromagnetic Alternating field.

Working bodies are in the Chamber in advance in the form housed by magnetized barium hexaferrite granules.

The introduction of the barium hexaferrite powder into the mixture occurs as a result of the abrasion of the granules during mixing in the chamber.

The barium hexaferrite granules can be made entirely of barium hexaferrite as well as being inert Additives.

In addition, a part of barium hexaferrite granules which have a high level of rubability can be used.

For a better understanding of the present invention, the following exemplary embodiments are explained below.

The properties of the quick-setting, dry, cementing mixture to be prepared are given in Tables 1-3 listed following the examples.

example 1

The components of the mixture: 50% cement and 50% alabaster in an amount of 2 kg were poured into a cylinder

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- TO -

shaped chamber with a diameter of 100 mm, in which 500 g of magnetized balls with a Diameter of 5 now found from barium hexaferrite.

The chamber was enclosed with an electromagnetic coil, namely a solenoid, which in section had a height of 80 mm and a width of 45 mm and one coiled Has copper wire with a diameter of 2 mm.

liach the connection of the electromagnetic coil to an alternating current network with a voltage of 220 V and a frequency of 50 Hz received the magnetized Balls cause a disordered movement, which leads to the mixing of the components of the working chamber located in the working chamber Mixture led.

As a result of this treatment within 10 s, a mixture with the following composition was obtained:

Alabaster 49.995% by weight

Cement 49.995 wt.%

Barium hexaferrite 0.01% by weight.

Example 2

To increase the Bariumhexaferritgehalts in the mixture the remaining 497.8 g Bariumhexaferritkugeln (Example 1) were added 100 g of similar balls, which have an increased abradability (in whose preparation was the sintering temperature to 50 ⁰ C above the recommendable temperature (1250 ⁰ G) reduced).

809884/0778

/ NSPECTED

The remaining parameters of the technology described above have not been changed.

As a result, after the treatment, a mixture with the following composition was obtained in the course of 10 s:

Alabaster 49.95% by weight

Cement 4 9.95 wt.%

Barium hexaferrite 0.1 wt.%

Example 3

After processing 2 kg of mixture, which contained 50% by weight of cement and 50% by weight of alabaster, was within a mixture with the following composition is obtained after 50 s:

alabaster 49.5 cement 49.5 Barium hexaferrite 1.0

The other parameters of the technology described in Example 1 were not changed.

Example 4

After processing 2 kg of mixture containing 50% by weight of cement and 50 % by weight of alabaster, a mixture with the following composition was obtained within 150 s:

Alabaster 48.5% by weight

Cement 48.5% by weight

Barium hexaferrite 3 wt.%

The setting times and strength for uniaxial compaction were then determined for these mixtures.

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The tests of the mixtures to determine the setting times were carried out with a Vieck needle and those for Determination of strength during uniaxial compaction carried out with cubes with dimensions of 7 χ 7 χ 7 cm. The results of the tests are summarized in Table 1 below.

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'Tabel

Setting times and strength of the cementing mixes for uniaxial compaction, ν / cm

of the composition .abbxnde example setting d. times

th

oeirn uniaxial earning

Mixture beginning Eade

Conditions d. Hardening

Cements Z) (min) (mm) Air hardens and ^ 24 hours water hardness Aläbaster C A) 1h 2h ■ 1h 2 _h 24 h Barium Hexa * ferrite HHF) 700 i _# Kontrpll- Z 50% by weight 6 8 17 <? 260 220 300 75 ^G Sample A 50 Ge ^.% 2. Example 1, line 49.995 ■ ■;. '; ■ weight #, ■■■; _i;. 'A, 49.995 - ·,: weight fo ■ , BHF; 0.01 70C 180 260 250 200 75 0

3. Example 2 Z 49.95

Weight%

A.49.95, ''. ■. ■■ Gev /,% ¹

co O (O OO OO

* ■ »

σ *

BHF 0 $ 1 wt.%

600 198C 750

7OC 180C

. Example ? Z 49.5 Weight%

-.49.5
Weight% 14th 16 270 360 BHF.1.0
Weight% 5. Example 4 Z 49.5
Weight% A ·, 48.5
Weight% 20th 25th 180 220 BHF 3.0
& ew,%

From Table 1 it can be seen that a cementing Mixture with a cement content of 49.95% by weight, an alabaster content of 49.95% by weight and a barium hexaferrite content of 0.1% by weight has the best physical-mechanical properties. A cementing mixture with a cement content of 49.99 5% by weight, an alabaster content of 49.9 95% by weight and a Barium hexaferrite content of 0.01% by weight differs little in terms of its properties from a control mixture, in the case of a cementing mixture with a cement content of 48.5%, an alabaster content of 48.5% by weight and a barium hexaferrite content of 3.0% by weight However, the start of setting and the strength is significantly reduced compared to Examples 2 and 3.

Therefore, further tests were carried out for a cementing mixture with the best physical-mechanical Properties performed, d. H. for a Qemish, which contains 49.95 wt.% cement, 49.95 wt.% alabaster and 0.1 wt.% barium hexaferrite.

The results of the adhesion tests of the Cement stone on types of rock in the event of expansion are summarized in Table 2.

909884/0775

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909884/0775

ORIGINAL INSPECTED

In connection with high activity of the Cementing Mixture of the Invention and Difficulties When stored under the conditions of a research expedition, the mixture was used before storage Silica gel in the form of a finely divided powder or granules or in the form of a mixture thereof added.

The results of the property change tests of the cementing mixture with a cement content of 49.95% by weight, an alabaster content of 49.95% by weight. and a barium hexaferrite content of 0.1 wt. % at j its storage under the conditions of the far north are summarized in Table 3.

S09884 / 0778

ORlGIlSfAL, INSPECTED

Table 5.

Change of properties of the cementing mixture
"when it was stored under the conditions of the far north

ce » 'No. of , example Silica gel •O Pourability . 12 M. 24 M. • Well Well ¹ O.M · - Compressive strength 12 13. c in % ο Example ι
!Control additive Well sole « Schl. Well Well 100 - ^e ? Output of fs mm co ι Weight% Mt 6, M by 6 M. 24 M. 00 ;Example mm Well sole. through T. sole. average 100 40 80 mm OO i average O ι 1 5 Well 100 30th 33 O \ Example Well Well 100 100 Q -4
-4 example ■ ζ. cn 2 10 Well 1OC 80 Γ " Well 100 100 Z Well 80 - SPE 3 15 Well 100 100 4 20 Well 80 -

■ M = month

This table shows that with a silica gel addition of

% By weight of the mixture at Lagsru ^ up to a year its high

Retains physical-mechanical properties, which, however, change significantly with prolonged storage worsen.

A silica gel addition of 20% by weight leads to a loss of strength of the cement stone, while a silica gel content of 15% by weight in the mixture is optimal.

Ö0988A / 077S

'NSPECTED

Claims (6)

Claims Der40 fast-binding _r dry cementing mixture to eliminate complication zones in the drilling of wells, which is produced on the basis of a powdered gypsum cement binder - containing 5O% by weight of cement and 5O- 60% by weight gypsum, or alabaster, dad ur ch labeled in z.. eic h et that it contains 0.01-3.0% by weight of barium hexaferrite powder with particle sizes which are comparable to the dimensions of the binder particles. 2. Mixture according to claim 1, characterized in that it contains 5-15% by weight of silica gel. 3. Process for the preparation of a mixture according to claim or 2, in which the gypsum-cement binder is produced by mechanical mixing of the powdered cement - and gypsum - or Alabaster is contained, which are taken in an appropriate ratio, characterized in that the mixing is carried out under the conditions of an electromagnetic alternating field, barium hexaferrite powder is additionally introduced by rubbing the working organs and, as such, magnetized granules Barium hexaferrite base were used. 530- (P 77866-X-6DTF 00985 ^ / 0776 4. The method according to claim 3, characterized in that granules are used that are completely off Barium hexaferrite are made. 5. The method according to claim 2, characterized in that granules are used, which are made of barium hexaferrite are made with inert additives. 6. The method according to claim 4 oderl5, characterized in that a part of granules is used, the one have increased rubability. 9098Ö4 / 077B