SU1303701A1 - Method of cementing boreholes - Google Patents

Abstract

The invention relates to the mining industry. The purpose of the invention is to increase the efficiency of cementing by improving clogging properties of non-hardening composition. The hardening, non-hardening and non-hardening compositions are introduced into the zag pillar space, the latter of which consists of a liquid and a solid phase. A preliminary estimate of the possible magnitude of channel opening. Depending on this value, the solid phase of non-hardening composition is dispersed before its injection and three discreteness fractions of 1.2-0.8 are used; 0.3-0.1 or less of the opening of the channels when the ratio of the fraction volumes is 3: 2: 5, respectively. The total concentration of the solid phase is taken as maximum, determined from the conditions for pumping the composition. As a solid phase non-hardening composition using a mixture of crumb rubber and lignin. After the portions of the cement slurry adjacent to the non-hardening composition are solidified, the non-hardening composition is enclosed in a confined space. (L o 00

Description

The invention relates to the mining industry, and more specifically to oil and gas 3 O before existing, and can be used for well cementing.

The purpose of the invention is to increase the efficiency of cementing by improving the spinning properties of the non-hardening composition.

The essence of the method is that a hardening solution and a non-hardening composition consisting of liquid and solid phases are introduced into the annular space. Preliminary estimate the possible value of opening the channels. Depending on this value, the solid phase of the non-hardening composition is dispersed before it is injected and three fractions of dispersion of 1.2-0.8 are used; 0.3-0.1 or less of the opening of the channels at a ratio of the volumes of the fractions, respectively, -3: 2: 5. The total concentration of the solid phase is taken as the maximum, defined. Leakage of the condition of pumpability of the composition. As a solid phase of a non-hardening composition, a mixture of rubber shredding and lignin is used. After the portions of the cement slurry adjacent to the non-hardening composition harden, the non-hardening composition is enclosed in a confined space. In the case of formation of the channel composition at intervals from below and above, the fluid (for example, from the lower channel) will begin to flow to the composition, pushing it up or inserting it into it. In this case, we assume that the pressure drop is directed upwards. For the first time after the beginning of the movement of the fluid, the non-hardening composition will be pressed into the upper channel. If the upper channel clogs with the composition before the fluid approaches it, the formation will be reduced and cease.

Example. In previously constructed wells, where fluidization of n6 to the cemented annulus took place, the amount of opening of the fluid-conducting channels is determined using known methods. Suppose this value is 1 mm.

053-0.1 and less than 0.61 mm, while the volumes of the fractions are taken in a ratio of 3: 2: 5, respectively.

Shutter the resulting mixture with water 5 in ratios, the AzNII cone determines the maximum concentration of the solid phase in the non-hardening composition, at which the latter retains pumpability.

To know the depth of the well at which the plaspotential fluid source is located, calculate the volume of the annular space in the interval of cementing over the reservoir.

 5 V, under the roof of the seam V Select the volume of non-hardening composition V

of condition

Y „

VCM - V,

cr

20

25

where d is the volume of the mixture of non-hardening composition. cement slurry resulting from pumping;

cr

- critical volume netver30

The blowing composition, determined from the conditions of excess hydrostatic pressure in the well above the reservoir.

V,

 0.04 (V + V),

where Vj is the internal volume of the casing. Assume V, 40 m; 5 m; V 45 m; VKP 6 m, then 0.04 (45 + 5) 2 m, we get m.

wasp

j At a drilling 4 m rubber-lignin slurry with a predetermined concentration of solids is prepared in any mixing device or using a cementing unit.

40

Pumped into

annular space portions 36 m (y, -V)

 40-4: 36

LZ

M

cement mortar.

45 m non-hardening composition and 5.5

cement mortar (V, + V „5 +0.5

1 ST

 5.5 mgde

- estimated volume

cement glass). 50 Formula of invention

A method of cementing wells, including batch injection into the annular space, hardened. Before cementing a well, 55 Brush of cement slurry and inadequate dispersion and selection of the necessary composition consisting of hardened fractions prepare a mixture of water and liquid phases that distinguishes - Zine brooding and lignin. At the same time, in order to increase the effect, fractions equal to 1.2-0.68 are selected; the efficiency of cementing by

3037012

053-0.1 and less than 0.61 mm, while the volumes of the fractions are taken in a ratio of 3: 2: 5, respectively.

Shutter the resulting mixture with water 5 in ratios, the AzNII cone determines the maximum concentration of the solid phase in the non-hardening composition, at which the latter retains pumpability.

To know the depth of the well at which the plaspotential fluid source is located, calculate the volume of the annular space in the interval of cementing over the reservoir.

 5 V, under the roof of the reservoir V Select the volume of non-hardening

of condition

Y „

VCM - V,

cr

20

where d is the volume of the mixture of non-hardening composition. cement slurry resulting from pumping;

cr

- the critical volume of non-hardening composition, determined from the conditions of excess hydrostatic pressure in the well above the reservoir.

V,

 0.04 (V + V),

where Vj is the internal volume of the casing. Assume V, 40 m; 5 m; V 45 m; VKP 6 m, then 0.04 (45 + 5) 2 m, we get m.

wasp

 At a drilling 4 m rubber-lignin slurry with a predetermined concentration of solids is prepared in any mixing device or using a cementing unit.

Pumped into

annular space portions 36 m (y, -V)

 40-4: 36

LZ

M

cement mortar.

5 m non-hardening composition and 5.5

cement mortar (V, + V „5 +0.5

1 ST

 5.5 mgde

- estimated volume

cement glass). 50 Formula of invention

3 1303701 4

improvement of clogging properties of the non-covering of channels; tipn; ratio of the hardening composition, as fractions of 3: 2: 5, respectively;

solid phase non-hardening composition and the concentration of the solid phase in

a mixture of rubber crumb is used in the invertorizing composition; they take the maximum of the lignin of three degrees of dispersion, which is determined from the condition of the rocage 1.2-0.8; 0.3-0.1 or less of the latter.

Claims (1)

A method of cementing wells, including batch injection into annular space, is hardening. Before cementing a well, by dispersing and selecting the necessary fractions, a mixture of rubber crumb and lignin is prepared. In this case, fractions equal to 1.2-0.68 are selected; cement mortar and non-hardening composition, consisting of solid liquid phases, characterized in that, in order to increase the cementing efficiency by improving the colmatizing properties of a non-hardening composition, a mixture of rubber crumb and lignin of three degrees is used as a solid phase of a non-hardening composition dispersion, gene 1.2-0.8; 0.3-0.1 and less than the opening of the channels ίιρπ the ratio of the volumes of fractions is 3: 2: 5, respectively, and the concentration of the solid phase in the non-hardening composition is taken to be maximum · 5, determined from the condition of non-pumpability of the latter.