Lightweight cement composition

 

The invention relates to the field of mining, namely to cementing oil and gas wells with abnormally low formation pressure. Lightweight cement composition containing clinker, Tripoli and gypsum contains Tripoli and additionally heat-treated limestone in the following ratio, wt.%: clinker 56, Tripoli heat-treated 38, gypsum 3, limestone 3. Effect: increase and preserve the activity of lightweight cement composition during long term storage, tensile bending/compression of the cement stone in the temperature range 20-100oWith, sedimentation stability. table 2.

The invention relates to the field of mining, namely to cementing oil and gas wells with abnormally low formation pressure.

Known lightweight cement composition (element) for cementing in the interval zone unproductive sediments containing Portland cement and bentonite bentonite in the following ratio, wt.% /1/: Portland - 80-86 Bentonite bentonite - 14-20 However, the application of elementnum compositions has the following disadvantages: additional costs pricoa not only on the quality of the cement, but also on the quality bentonite; significant water segregation.

In addition, the slow rate of structure formation in elementnum solution at low temperatures leads to an increase of the hardening period, low strength in bending and compression, especially in the early stages of hardening. This adversely affects the quality of attachment, as measured by coupling of the resulting stone casing and rock formation, since the processes of hardening slowed down in time and in the formation of the pore structure, the role of sedimentation processes constantly makes a destructive nature.

The decrease in the density of cement slurries can be achieved by using as facilitating supplements siliceous materials. The advantage of lightweight cement compositions with additives siliceous materials are increased sulphate resistance and physical-mechanical properties of stone, obtained on the basis of them.

Known cement composition containing Portland cement clinker, facilitating additive Tripoli and gypsum in the following ratios, wt.% /2/: Portland cement clinker - 47 Tripoli - 50
Gypsum - 3
On the basis of this cement composition may receive oblegchenno the/img>1,0.

The disadvantages of this lightweight composition are reduced rheological and physico-mechanical properties of mortar and stone with long-term (>3 months) storage time, high water segregation of cement slurry and low strength of the rock at low and normal temperatures curing. This is because under normal preparation of raw materials Tripoli contains from 10 to 15% of residual water. The presence in Tripoli residual water leads to moisture absorption during storage of cement and, as a consequence, the deterioration of its rheological and physico-mechanical properties.

The problem solved by the invention is to increase and preserve the activity of lightweight cement composition with long-term (up to 9 months) the retention, provision of high-strength Flexural/compressive cement stone at its base in the temperature range 20-100oWith, sedimentation stability.

The technical essence of the invention is that a lightweight cement composition containing clinker, Tripoli and gypsum contains Tripoli and additionally heat-treated limestone in the following ratio, wt.%:
Clinker - 56
Tripoli heat-treated - 38
Gypsum - 3
And who implemented the composition of the lightweight cement cement contains a pre-heat-treated Tripoli and limestone, and therefore meets the criterion of "novelty."

Preliminary preparation of raw material Tripoli is cooked with specially selected temperature. When this is dried to zero moisture content and activation of Tripoli, which allows to obtain a lightweight backfill material and the solution on the basis of density 1400-1500 kg/m3low-water separation, high strength characteristics of the stone and to ensure long-term retention of the material. Physico-mechanical and rheological parameters of cement mortar and stone of the proposed lightweight material stored within 9 months meet the requirements of GOST 1581-96 and exceed the parameters and analog prototype, measured in identical conditions.

The addition of limestone can increase the thickening time of the cement test at the test temperature 75oAnd strength properties remain almost unchanged in the range of additives 1-3%.

Thus, the claimed technical solution meets the criterion of "inventive step and is industrially applicable.

For the development of a lightweight cement composition to laboratory studies. Study the CSOs plugging material at the minimum, optimum and maximum ratio of components, wt.%:
Example 1 (minimum)
Clinker - 67
Tripoli heat-treated - 28
Gypsum - 3
Limestone - 2
Example 2 (optimum)
Clinker - 56
Tripoli heat-treated - 38
Gypsum - 3
Limestone - 3
Example 3 (maximum)
Clinker - 47
Tripoli heat-treated - 45
Gypsum - 3
Limestone - 4
Example 4 (to a minimum)
Clinker - 72
Tripoli heat-treated - 25
Gypsum - 3
Limestone - 1
Example 5 (above maximum)
Clinker - 42
Tripoli heat-treated - 50
Gypsum - 3
Limestone - 5
The research results are summarized in table. 1.

To assess the duration of storage materials laboratory investigations into the changes in rheological and physico-mechanical properties of mortar and stone lightweight cement compositions, both known and proposed, depending on the time of their storage.

The research results are summarized in table. 2.

From table. 1 and 2 it follows that suggested by the authors lightweight cement composition possesses enhanced strength characteristics and retains its properties during long-term storage. The latter is especially true when using it in remote fields where a cement composition.

The fastening of the production string in the range of productive deposits of cement is Portland cement, corresponding to GOST 1581-96.

For mounting the casing in the interval unproductive deposits with an overlap of 100 m Shoe conductor uses proposed by the authors lightweight backfill material. With the application of the proposed lightweight composition on the fields of OJSC "Surgutneftegas" 8 cemented production casing.

Feasibility or other efficiency.

1. The adaptability of this material in the works for cementing production casing. The solution is stable during the whole process of cementing.

2. The reduction in time for cementing by 10%.

3. Ensure the lifting height of cement slurry for the production column to the design level by 100%.

4. Increasing the quality factor of the well casing at 30-33% compared with ElementName mixtures.

SOURCES of INFORMATION
1. Danyushevsky B. C. and other reference backfill materials. M., Nedra, 1987, S. 114.

2. Bulatov, A. I. Grouting materials and technology cementing. M., Nedra, 1982, S. 195 - a prototype of the EP, Tripoli and gypsum, characterized in that it contains Tripoli and additionally heat-treated limestone in the following ratio, wt. %:
Clinker - 56
Tripoli heat-treated - 38
Gypsum - 3
Limestone - 3

 

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