SU911015A1 - Method of finishing wells - Google Patents

Description

The invention relates to the drilling of a well, in particular to their completion. A well completion method is known, which includes opening the production formation, descending the column, its centration above the production plate and perforation of the uncemented interval of the casing 1. However, this method does not provide isolation of the production layer from aquifers. In addition, the method is limited in applications, especially in cases when product layers are composed of rocks prone to rock formation. The closest to the invention is a method of completing wells, including opening the reservoir with a hydrocarbon-based solution, lowering the production string, cementing it and conveying l2J. The disadvantage of this method is the possibility of clogging of the productive horizon during cementing the production string. The purpose of the invention is to increase reliability in preventing clogging of the productive formation and increasing its filtration properties. The goal is achieved by the fact that before the descent of the column is productive -. The perforation is punched and then overlapped with an impermeable shell. The method is carried out in the following sequence. After opening the hydrocarbon-based reservoir, perforation of the reservoir is performed. Then the layer overlap impermeable shell. After that, the production column is launched, cemented, the formation is re-treated with a hydrocarbon-based solution, and the production column is perforated.

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PRI me R. After the reservoir has been covered and the well has been drilled to the design depth with a hydrocarbon-based solution or solution (the last case is considered), a geophysical survey is carried out on a water-based basis. of the following composition, weight:

Diesel fuel 20-50 Mineralized water B-Ub Oxidized petrolatum 3.5-4.0

Caustic Sodium 0.2-0.3

Phenol formaldehyde resin

OF-10.2-0.8 brands

The volume of solution is taken from the calculation of the complete overlap of the interval of the productive formation.

Then a perforator is lowered into the well and a productive formation is shot through, thereby creating additional channels and cracks in it. Then the reservoir overlap impermeable shell. For example, a profile overlay is used as the latter. It is lowered into the interval of the productive formation on the pipes and is pumped out by pumping fluid through the pipes. The cover block, increasing to the diameter of the well, tightly presses against its walls and isolates the reservoir in this interval. In order to increase the quality of the insulation, a hermetic sealing paste is applied to the hollows of the profile tubes.

The further lowering and cementing of the casing string is carried out by known methods. At the same time cement

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the solution is not in contact with the reservoir and does not clog it.

After the cement has hardened into the column in the interval of the productive formation

a hydrocarbon-based solution is pumped, then the production string, the cement ring and the shutter are perforated and the well is drilled.

The technical and economic advantage of the method consists of increasing the flow rate of the productive formation (by a factor of 3-5) both by eliminating the negative effect on the permeability of the bottom-hole drilling and cement zone

solutions, and due to a significant increase in permeability through the additionally formed channels during the preliminary perforation of the uncemented productive formation.

Claims (2)

Invention Formula The method of completing wells, including opening the reservoir with a hydrocarbon-based solution, lowering the production string, cementing it and perforation and then overlap it with an impermeable shell. Sources of information taken into account during the examination 1. Yu.V. Vadetsky. Drilling of oil and gas wells. M., Nedra, 1973, p. . 2. Mishevich V.I. Drilling Engineer's Handbook, Vol. 2. M., Nedra, 1973, p. 265-282 (prototype).