SU1608330A1 - Bottom-hole zone casing device - Google Patents

Abstract

The invention relates to the mining industry and can be used in the extraction of hydrocarbon raw materials. The goal is to simplify the technology of the well bottom zone mounting while increasing its reliability and safety. To do this, gravel is introduced into the filter zone of the well in a carrier fluid (LV) and secured. An aqueous solution of a mineral salt or a 20-32 @ -th aqueous solution of oxidized tall oil pitch (PRT) is used as a ZhN. Gravure fixation is performed by pumping a buffer fluid (BZ), active in relation to the LF. When an aqueous solution of a mineral salt is used as a ZhN, a 20-32% aqueous solution of PRP is used as the BZ, and when using a 20-32% aqueous solution of PRP, an aqueous solution of a mineral salt is used as the BZ as the BZH. As an aqueous solution of the mineral salt, aqueous solutions of sodium chloride with a concentration not lower than 10%, or calcium with a concentration not lower than 5%, or zinc with a concentration not lower than 40%, or produced water with a density not lower than 1150 kg / m ^{3, are used} . At the same time, an anchoring material with high adhesive properties is formed in the intergranular space of the filter. As a result, the gravel is fixed in one monolithic frame, the phase permeability of which is restored to gas by gas to 86.7% of the original. 1 hp ff.

Description

an aqueous solution of PRP as a carrier fluid, an aqueous solution of a mineral salt is used as a buffer liquid;

Sodium chloride or calcium chloride, or zinc chloride, or formation water with a density of at least 1150 kg / m can be used to prepare an aqueous solution of the mineral salt. The concentration of the aqueous solution should not be less than 10% for sodium chloride, not less than 5% for calcium chloride and not less than 40% for zinc chloride.

When this method is implemented directly in the well in the intergranular space of the filter, a fixing material with high adhesion properties is formed, due to which the gravity is fixed in one monolithic skeleton, the phase permeability of which is reduced by gas to 86.7% of the original, i.e. before fixing the gravity forming anchoring agent.

The choice of the concentration of an aqueous solution of PRP from 20 to 32% is due to the need to separate as much resinous anchoring material in the intergravel space as possible to obtain durable elastic shells around gravel grains to form a filter with a fixed position of the gravel grains. The minimum content of mineral salts in the solution is chosen depending on the conditions of application of the method and the need to convert the entire PRT into a resin. In order to achieve an effect in practice (taking into account the possible dilution of solutions with fresh water), the concentration of mineral salts should be increased.

PRI me R. Downhole equipment is extracted from a production well drilled to a productive horizon represented by unstable sandstone. The open portion of the borehole is expanded to a diameter of 260-300 mm. The well is filled with a clay mortar with a density of 1050-1150 kg / m and a filter with a diameter of 89 mm is pushed into it with a tubing with a gap between the turns of the profiled wire of 0.3-0.4 mm.

A gummy film is obtained on the surface of the gravel grains, which fasten them together due to the high adhesiveness of the resin, while retaining the gas permeability of the gravel mass.

The method is carried out as follows.

The 5 m tank is cleaned until all mechanical and salt contamination is completely removed; an OTP aqueous solution is prepared in it. For this purpose, 320 kg of PRP are crushed, filled with hot water (70-80 ° C) to a volume of 1 m, and thoroughly mixed to obtain a homogeneous aqueous solution with a viscosity of 60-80 s. With stirring, pre-sieved gravel of 0.63-1.00 mm fraction is introduced into the resulting solution. The suspension is pumped into the well through the tube space. Then, 1.5-2.0 m of fresh water is pumped as the first buffer fluid through a gravel filter into the reservoir with the after-removal of excess gravel,

5 formed above the filter zone in the annulus. After conducting geophysical surveys using the GGK method, in order to determine the quality of the gravel packing in the filter zone, and unpacking the tubing at a closed hole, 20–40 m of formation water of 1150 density is pumped through the tubing, starting from the initial to the final portion of the reservoir water.

5When attaching the bottomhole zone of a well that has just emerged from drilling with a relatively stable reservoir, use an OTP aqueous solution as a carrier fluid, and

The quality of the buffer liquid is a 30% aqueous solution of sodium chloride.

In a well filled with a saline, clay solution with a density of 1800 kg / m, an aqueous solution of a mineral salt (70% zinc chloride solution) is used as a carrier fluid, and a 32% aqueous solution is used as a buffer fluid. OTP.

The proposed method of attaching a downhole zone at 0 allows an increase in the well flow rate by increasing the permeability of the filter as the mechanical strength of the gravel filter increases and the gravel is fixed to the fixed skeleton.

Claims (2)

1. The method of securing the well bottom zone, which includes the delivery of gravel to the filter zone of the well in the carrier fluid with its subsequent fixing 0 by pumping a buffer fluid active in relation to the carrier fluid, characterized in that, in order to simplify the technology while at the same time increasing its reliability and safety, 5, an aqueous solution of a mineral salt or a 20–30% aqueous solution of saponified taller pitch is used as a carrier fluid, while a buffer liquid active with respect to the carrier liquid is used, respectively. 5 16083306 20-32% aqueous solution of oxidized sodium chloride with a concentration not lower than tall pitch or an aqueous solution of mine-10%, or an aqueous solution of calcium chloride Ralny salt. with a concentration of not less than 5%, or water 2. The method according to claim 1, characterized by a solution of zinc chloride with a concentration not by the fact that, as an aqueous solution of mine-5, below 40%, or produced water with sea salt, use an aqueous solution not lower than 1150 kg / m.