Method for well bottom zone consolidation

FIELD: underground well repair, particularly methods to create behind-casing screen in productive reservoir of oil, water and gas wells.

SUBSTANCE: method involves injecting foamed polymeric solution including water-soluble polymer in amount of 1.5-2.5 % by weight, foaming agent in amount of 1-3% by weight, cross-linking foam stabilizing agent in amount of 0.2-0.6% by weight and water in bottomhole formation zone; injecting porous plugging composition including cement grout with 0.3-0.5 water-cement rate taken in amount of 60-80% by weight, above mentioned foamed polymeric solution in amount of 20-40% by weight in bottomhole formation zone. Each of said solutions is characterized by viscosity η and yield point τ change during injection and cross-linkage thereof.

EFFECT: prevention of bottomhole formation zone blocking in slightly cemented reservoirs.

8 cl, 4 tbl, 5 dwg, 1 ex

 

The present invention relates to techniques and technologies for underground repair of wells, and in particular to methods of creating a porous filter in the reservoir oil, water and gas wells.

The known method of fastening the bottom zone of the well, comprising a casing, injection grouting cement mortar, its hardening and perforation columns [1].

The drawback of this method is that from the reservoir with laborzentrifugen breed through the perforation tunnels into the borehole come silt suspension and sand, and this leads to the obstruction of the channels and, consequently, to the decommissioning of the well.

The closest in technical essence and the achieved result to the proposed technical solution is the method of fastening the bottom zone of the well selected for the prototype, including the injection of stable and plastic grouting cement mortar, the porosity of which is ensured by the presence kilocharacters inclusions.

In the method of fastening the bottom zone of the well, comprising preparing a cement slurry with kilocharacters filler, pumping and hardening, drilling, washing the formed stone of salt, as collateraldamage filler used coquina fracc is and 0.7-1.5 mm in the amount of 10-15 wt.% and in addition to the cement slurry is injected surfactant in quantities of 0.5-1.0 wt.%.

However, this method does not provide the quality education the permeability zone after surgery due to changes in the structure of the resulting cement, namely the change of rheological properties in the process of pumping a cement slurry into the reservoir.

According to the prototype of the cement slurry is an aqueous disperse system on the basis of cement filled with limestone fraction of 0.7 to 1.5. In static conditions the cement slurry filled sedimentation stable system. Static shear stress in the process of beginning structuring, providing the ability of a solution to keep suspended particles, is 1000-1800 DPA. After processing, the porosity of the obtained cement costs 35-40% after treatment acid solution.

However, the curve of the flow of the solution (figure 1) - dependence of shear stress on the shear velocity, taken in the opposite direction from the maximum speed to the minimum at the time of injection and, Vice versa, from the minimum to the maximum in the process of structuring, defined by revisorer "RHEOTEST-2" at a temperature of 28.5°C (temperature of the reservoir SC-1) - indicates that a stable and plastic cement cement is a non-Newtonian fluid, i.e. the viscosity is not the settlement of annoy value and depends on the shear rate. Cement mortar filled with limestone fraction of 0.7 to 1.5 is a pseudo-plastic fluid, which is characterized by the presence of a static shear stress and the lack of ultimate dynamic shear stress, that is, under the application of shear stress above the SNA is the destruction of the structural grid, which hold particles of limestone in suspension, the composition does not already possess strength characteristics and behaves as a Newtonian liquid. Thus, when the shear stresses above 125 DPA there is a change in the distribution of filler in cement mortar with filler due to sedimentation of suspended particles. Released from the solution of the filler settles when promoting composition in the wellbore with high shear agitation, the solution loses its homogeneity. The result is not formed porous cement stone in the whole and in the bottomhole formation zone clogged ducts and formation fluids do not arrive at the wellhead.

In addition, the spin-off of the cement slurry shell with borehole jednoty gets on pumps, disabling the internal equipment of the well.

The aim of the invention is to obtain a porous material in the entire volume to prevent clogging of the bottom zone for scheduling fastening of the bottom-hole formation zone by successive injection of foamed polymer solution, then the porous backfill cement mortar.

In the method of fastening the bottom zone of the well, comprising pumping in the near-wellbore area of the formation of porous cement slurry, pre-injected foamed polymer solution containing, wt.%: water-soluble polymer of 1.5 to 2.5, the expander 1-3, the staple-foam stabilizer of 0.2-0.6, the aqueous phase is rest, and porous cement slurry contains, wt%: cement mortar with water-cement ratio of 0.3-0.5 - 60-80 specified foamed polymer solution 20-40, with each of the solutions previously injected specified polymer and porous backfill, are characterized by a viscosity- η and the maximum dynamic shear stress - τ in the injection process and structure within ηmaxmin- 2.4 to 3.9 and τpZack- 1,3-2,7, where ηmaxmaximum viscosity in the process of structuring, MPa·, ηmin- minimum viscosity during injection, MPa·, τpultimate dynamic shear stress in the process of structuring, DPA, τZackultimate dynamic shear stress in the injection process, the AAA.

As the foaming agent can be applied nitrogen, air, natural gas to obtain a foam with a ratio of 0.2-0.6. As motorstv the action of the polymer can be applied polyacrylamide and/or carboxymethylcellulose, and/or styromaniac sodium, and/or polysaccharides. As the foaming agent can be applied Las sodium, and/or sulfinol, and/or neprinol GED, and/or neonol.

As the staple-foam stabilizer can be applied potassium bichromate, and/or sodium bichromate, and/or kalichrome alum, and/or potassium alum, and/or sodium acetate. As the aqueous phase can be applied to fresh water, and/or produced water, and/or a solution of CaCl2and/or a solution of KCl and/or NaCl solution.

Porous cement slurry is prepared as follows: first, the cement slurry is then foamed polymer solution, and then stirred, and to ensure uniform distribution of the foamed polymer solution during the structuring in the cavities of the layer of the injection of fluids into the borehole lead with a time of 30-40 minutes.

In the proposed method prior to the formation of porous cement filter injected foamed polymer solution. Foamed polymer solution is a flexible foam system is partially cross-linked polymer solution with the prisoners inside the gas bubbles. While moving in the wellbore at high shear rates obtained polymer frame is not destroyed, but is stretched macromolecules crosslinked elastic polymer, the gas bubbles are deformed, but the strength of the structural grid is sufficient for retention of gas bubbles in the solution. After stress injection in a static state at a temperature of formation of the gas bubbles expand, foamed polymer solution increases in volume, filling cavities and caverns, procreate, while maintaining porosity. Flow curves of injection foamed cross-linked polymer solution and restoring the structure to its structuring is shown in figure 2.

As can be seen from figure 2, the flow curves of crosslinked foamed polymer solution characterized by the presence of the SNA and the maximum dynamic shear stress. The restoration of the structure after removal of the load is characterized by a measure of thixotropy, which is determined by the ratio of the maximum viscosity of the beginning of the structure to the minimum viscosity of the destroyed structures in the injection process, ηmaxmin. The degree of destruction of the structural grid when pumping the solution and recovering its structuring is determined by the ratio of the marginal dynamic shear stress when structuring to the maximum shear stress during injection τpZack.

Table 1 shows the rheological characteristics during injection and structuring compositions with different ratios of components and Paris the ity of the samples after the study.

The studies proposed composition of the dispersion medium foamed polymer solution, wt.%:

Water-soluble polymer of 1.5-2.5

The expander 1-3

The staple of 0.2-0.6

The aqueous phase is the rest

As the results of the study of rheological properties and porosity of the proposed technology allows to deliver foamed polymer solution is not practically destroyed when pumping.

In addition, the foamed polymer solution in contact with formation water is additionally expands by absorbing water, creating a waterproof barrier. At the same time the oil is freely filtered through the porous foamed polymer. Foamed polymer composition has good adhesion to the breed and pescaderia ability, while maintaining mechanical impurities (sand, silt inclusions of rocks and so on) in a suspended state, without creating dense sand tubes (figure 3).

Then pumped porous cement slurry, which after curing forms a porous cement stone. Porous backfill composition is a composition based on cement with a water-cement ratio of 0.3-0.8 and spumed races the thief in the ratio, providing the necessary rheological parameters of the injection and the beginning of the structure and hardening filter with a porosity of not less than 30-40% vol. within 48-36 hours. Flow curves of the pump filter and the beginning of the structure shown in figure 4. Rheological parameters of porous cement slurry, curing time and the porosity of the resulting filter is shown in table 4. Figure 5 shows a photograph of the obtained filter with increased 90 times.

As a result of laboratory research is proposed composition of the porous filter,%:

Cement mortar with water-cement ratio of 0.35-0.40 - 60-80.

Foamed polymer solution 20-40.

Specific example

The method is as follows.

In pescarola mining oil well pipe casing, perforated in the interval of the reservoir, and equipped down to the perforated interval pump-compressor pipe (tubing) using the unit of CA-320 and compressor with the mixing of the components is prepared, the composition is foamed polymer solution in the amount of 2/3 of the anchoring zone is about 2 m3and perform its injection into the high-permeability, laborzentrifugen areas of the reservoir. The composition is maintained in the reservoir for 10-30 min to structure and secure grip foam floor is dimensional solution with the breed due to thermal expansion of gas bubbles.

During this time preparing comosite porous cement slurry.

In the compartment Assembly CA-320 prepares the estimated number of 0.3 m3foamed polymer solution. In an intermediate tank is preparing cement water-cement ratio of 0.35-0.40 in the amount of 0.7 m3. In a ready solution under stirring at low speed unit is added to the foamed polymer solution.

The resulting mixture is pumped into the perforations, partially zadumivaetsa in formation, blocking the perforations, left on RFQ for 48 hours. Then razvarivat cement glass and cause the flow of fluid in the usual way.

Technology was used in the North-Pokursky field K SCV to conduct selective water shut-off layer with a high content of solids (0.2 wt.%). The water content of the product was 95%. In the well was observed absorption solution, pickup 570/80.

The dipstick Assembly CA-320 was prepared 2 m3foamed polymer solution. Pumped into the reservoir 1.5 m3compositions at low speed cementing unit AC-320.

Prepared 80 wt.% cement mortar with water-cement ratio of 0.36. The dipstick Assembly is thoroughly mixed with 20 wt.% composition foamed polymer solution. The obtained porous cement slurry ass is dragged into the reservoir, blocking the perforations. A pressure of 180 atmospheres. After 48 hours rasberry "glass mastered the well in the usual way.

Water cut decreased and amounted to 82%, a solids content of 0.01 wt.%.

Sources of information

1. Abislaiman and other Equipment and technologies of well workover. M.: Nedra, 1987, pp.28-33.

2. RF patent № 2005165 on CL EV 33/138, 1993, BI No. 47.

3. RF patent № 2172814 on CL EV 33/138, EV 43/32, 2001.

1. The method of fastening the bottom zone of the well, comprising pumping in the near-wellbore area of the formation of porous cement slurry, wherein the pre-fetch foamed polymer solution containing, wt.%: water-soluble polymer of 1.5 to 2.5, the expander 1-3, the staple-foam stabilizer of 0.2-0.6, the aqueous phase else, and porous cement slurry contains, wt%: cement mortar with water-cement ratio of 0.3-0.5:60-80 specified foamed polymer solution 20-40, with each of the solutions - pre-injected - specified polymer and porous backfill are characterized by viscosity η and the maximum dynamic shear stress τ in the injection process and structure within ηmaxmin2.4 to 3.9 and τpZack1,3-2,7, where ηmaxmaximum viscosity in the process of structuring, MPa·C;

ηmin- minimum viscosity during injection, MPa·C;

τpultimate dynamic shear stress in the process of structuring, DPA;

τZackultimate dynamic shear stress in the injection process, the AAA.

2. The method according to claim 1, characterized in that as the foaming agent applied nitrogen, air, natural gas to obtain a foam with a ratio of 0.2-0.6.

3. The method according to claim 1, characterized in that as the water-soluble polymer used polyacrylamide, and/or carboxymethylcellulose, and/or styromaniac sodium, and/or polysaccharides.

4. The method according to claim 1, characterized in that as the foaming agent used Las sodium; and/or sulfonic acid and/or neprinol GED, and/or neonol.

5. The method according to claim 1, characterized in that as a staple-foam stabilizer used potassium bichromate, and/or sodium bichromate, and/or kalichrome alum, and/or potassium alum, and/or sodium acetate.

6. The method according to claim 1, characterized in that the aqueous phase used in fresh water, and/or produced water, and/or a solution of CaCl2and/or a solution of KCl and/or NaCl solution.

7. The method according to claim 1, characterized in that the porous cement slurry is prepared as follows: first, the cement slurry is then foamed polymer solution, and then stirred the.

8. The method according to claim 1, characterized in that in order to ensure uniform distribution of the foamed polymer solution during the structuring in the cavities of the layer of the injection of fluids into the borehole lead with time 30-40 minutes



 

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.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

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8 ex, 2 tbl

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2 cl, 2 dwg, 1 ex, 1 tbl

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