Method of fitting well filter in horizontal well

FIELD: oil-and-gas industry.

SUBSTANCE: in drilling, seepage-volume characteristics of the bed and their alteration over borehole are defined, borehole is divided into zones that differ in said characteristics by 1.5-1.6 times to select filter performance separately for each zone and quantity of holes. Screen filter elements are fitted in filter holes under plugs. Flow string with filter equipped with water- or oil-swelling packers is lowered into well, said packers being set at boundaries of zones with different characteristics and string being fixed. Assembly is assembled at mouth and composed of the following elements arranged from bottom to top, i.e. cutter, locating bearing, screw downhole motor and stiff locator to be lowered against the stop to plugs. At cutting sheared plugs, flow string is displaced downward to remove sheared plugs and to withdraw the flow string. Flexible pipe sting is lowered to work face and displaced therefrom to mouth along with injection of plugging material to isolate holes made at filter bottom perimeter.

EFFECT: higher efficiency of extraction or injection, simplified mounting.

3 dwg

 

The invention relates to the field of development of high viscosity oil and can be used for opening the productive strata horizontal extraction or injection wells and their equipment in this interval filters.

There is a method of completion of well construction (patent RU №2134341, IPC EV 43/11, publ. 10.08.1999, including the descent into a drilled well casing with the filter fitted plugs in the holes of the material, collapsing during the chemical exposure, the installation of the production casing in the well with the location of the filter in the productive interval of the formation, plugging of the production string with the filter, the expectation of curing grouting material, the descent into the well of the column tubing, filling the wells with a chemical reagent, patience well at the time of destruction plugs holes of the filter, the injection of gas with a variable pressure to the connection rate of the injected gas with the reservoir fluid and clean the bore from the reaction products. According to the invention in the grouting material in the interval filter type material, soluble chemical reagent for the destruction of the plugs holes of the filter. Before filling the wells with a chemical reagent fill the cavity tubing gas when outdoor satr the service space at the wellhead and push them downhole fluid to the bottom of the tubing, and after filling the wells with a chemical reagent his push gas into the annulus in the interval of the filter, after which the annulus at the wellhead is closed, and the subsequent injection of the gas is performed by the compressor.

The disadvantages of this method are:

first, the low quality of the opening of the reservoir, due to the fact that produce plugging as the production string and the filter, the filter is formed of a cement stone, worsening the hydrodynamic coupling hole and the reservoir;

- secondly, the low efficiency of development of deposits of heavy oil, due to the fact that when water breakthrough at some interval filter is flooding the entire production;

- thirdly, the imperfection of the opening of the reservoir, due to the fact that the number of holes formed through the body of the filter, which is installed soluble under the action of a chemical reagent plugs, does not take into account reservoir characteristics of separate parts of the reservoir, and this means that in areas with high porosity and permeability characteristics of the reservoir bandwidth of the filter is limited, and in areas with low porosity and permeability characteristics of the reservoir, on the contrary, will exceed the volume of the selection of high-viscosity oil.

Also there is a method of completion of well construction (A.S. SU # 1210507, IPC EV 43/08, publ. 07.12.1987, including the descent into a drilled well casing with filter plugs in the holes of the material, collapsing during the chemical exposure, the installation of the production casing in the well with the location of the filter in the productive interval of the formation, plugging of the production string with the filter, the expectation of curing grouting material, run a string of tubing in the hole, filling the hole with a chemical reagent, patience well at the time of destruction plugs holes of the filter, the injection of gas with a variable pressure to the connection rate of the injected gas with the reservoir fluid and clean the bore from the reaction products.

The disadvantages of this method are:

- first, when the plugging of the production string with the filter space between the reservoir and the filtration channels in the edges of the filter overlaps backfill material, which reduces the productivity of the well.

- secondly, there is inefficient opening of a productive layer due to the fact that the number of holes formed through the body of the filter, which is installed soluble under the action of a chemical reagent plugs, does not take into account the filtration-e the bone characteristics of separate parts of the reservoir, this means that in areas with high porosity and permeability characteristics of the reservoir bandwidth of the filter is limited, and in areas with low porosity and permeability characteristics of the reservoir, on the contrary, will exceed the injected amount or selection of high-viscosity oil in this zone.

The closest in technical essence is the method of installation of the downhole filter (patent RU №2378495, IPC EV 43/08, publ. 10.01.2010,, bull. No. 1), which includes the drilling of the wellbore, the descent into the drilled well at least one of the downhole filter installed as part of the production string and contains the cut tube through the holes in the filter, each downhole filter before descending into the well set the centralizer, which is fixed at the free filter element pipe downhole filter, above the downhole filter set casing packers, the number of which corresponds to the number of productive strata, after the casing is washed well and turn upwards to activate the packers, closing the Central hole in the seat of the packers fault element, for example a ball, with a subsequent rise of pressure inside the production casing and pumping cement into the annulus for mounting the casing above about aktivnogo layer. After hardening of the cement produced drilling cementing plugs, saddles packers and fault elements, as well as cut off the tube all the filters.

The disadvantages of this method are:

firstly, the complexity of the technological process associated with alternate landing packers, the number of which corresponds to the number of productive layers, while landing packers carry out, closing the Central hole in the seat of the packers fault element, for example a ball, with a subsequent rise in pressure inside the casing and pumping cement into the annulus above the productive formation, after the hardening of the cement produced drilling cementing plugs, saddles packers and fault elements;

- secondly, the low reliability of the method is related to the fact that landing packers carry out, closing the Central hole in the seat of the packers fault element, for example, ball and in horizontal wells likely unpressurized landing fault element on the packer saddle;

- third, ineffective opening of the reservoir, as the number of cut tubes that are installed on the body of the filter, does not take into account porosity and permeability characteristics of the reservoir, so the bandwidth of the filter will not match filtratio the but-capacitive characteristics of separate parts of the reservoir, for example, in areas with high permeability bandwidth of the filter will be limited, and in areas with low permeability, on the contrary, to exceed the total selection of high-viscosity oil in this zone.

The technical task of the invention is to improve the reliability and efficiency of drilling a horizontal well in the high viscosity oil with regard to porosity and permeability characteristics of the reservoir, as well as simplify the process of installation of the downhole filter in the horizontal well.

The tasks are solved by the method of installation of the downhole filter in horizontal wells, including drilling shaft horizontal wells, the descent into a drilled well casing, equipped with a downhole filter with cut plugs in the holes and packers, the fastening of the production string in the well with the position of the filter in the interval of the reservoir, remove cutting tubes in the holes in the filter.

What's new is that in the process of drilling a producing or injection horizontal well determine reservoir characteristics reservoir and change the trunk horizontal wells, divide the wellbore into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times, could be the cost from the reservoir characteristics select the bandwidth of the holes of the filter separately for each zone and the number of holes, then into the holes of the filter under the plugs set mesh filter elements, which number corresponds to the number of holes in each zone, down in the drilled horizontal well production casing with filter, equipped with a porous water or Nefteyugansk packers, and install them on the borders of zones of different porosity and permeability characteristics, generate fastening of the production string, then at the wellhead gather the layout from the bottom up: cutter, bearing the centralizer, a downhole mud motor, rigid centralizer, the lower the Assembly to the column pipe all the way into the cutting tube, serves the process liquid in the string of pipe and through the downhole motor lead the rotation of the cutter, in the process of milling cutting tubes move the string of pipe down and remove the cut off filter tube throughout its cross-section, remove the string of pipe with the layout of the wells, then to bottom down a column of flexible pipes, drag from the bottom to the mouth with the simultaneous injection of cement composition on the column flexible pipes, which isolate the holes drilled in the bottom perimeter of the filter.

In figures 1, 2, 3 schematically shows the method of installation of the downhole filter in the horizontal well.

The proposed method is carried out SL is blowing.

In the process of drilling a producing or injection well determine reservoir characteristics and their variation within the productive formation 1 (see figure 1) trunk horizontal wells 2. Divide the wellbore into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times.

For example, the length L of the barrel horizontal wells 2 in the reservoir 1 is equal to 400 m, reservoir properties and change the trunk horizontal wells 2 are defined as follows:

zone 3' - permeability of 0.85 Darcy, length L1=120 m;

zone 3 is the permeability of 1.3 Darcy, length L2=80 m (1.53 times relative to zone 3');

zone 3'" - permeability of 2.0 Darcy, length L3=60 m (1.54 times relative to the zone 3");

zone 3 is the permeability of 3.2 Darcy, length L4=140 m (1.6 times relative to zone 3'").

Border zones 3', 3", 3'", 3"" boundaries are the lengths L1, L2, L3, L4where reservoir characteristics differ 1.5-1.6 times.

Then select the bandwidth (the area of the passage sections) holes 4, 4', 4"...4n(figure 1 shows the relative) filter 5, for example, for a filter with a diameter of 168 mm separately for each zone 3', 3", 3'", 3"" find the area of the flow cross sections of the holes depending on reservoir characteristics. Selection square p is ochotnych cross sections of the holes 4, 4', 4"...4nfilter 5 for each zone 3', 3", 3'", 3"" carried out by any known method, for example as described in patent RU No. 2134341, IPC EV 43/11, publ. in bull. No. 33 of 09.12.1999,

The filter 5 is made of casing pipes with an external diameter D equal to 168 mm, and inner diameter of D equal 140,3 mm cross-sectional Area of the filter 5 F equal 154,5 cm2.

Next, determine the number of holes 4; 4'; 4"...4nperformed in the filter 5 in each zone, according to the formula:

NZi=(K1/Ki)-(4·F/N·do2)·Li/k,

where K1- minimum permeability in the zone of the productive part, opened the trunk horizontal wells, Darcy;

Ki is the permeability of rocks in the zone of the productive part, opened the trunk horizontal wells, Darcy;

F - sectional area of the filter, cm2;

P=3,14;

do - diameter cutting tubes 6, 6', 6"...6n(figure 2 shows conventionally inserted into the holes 4, 4', 4"...4n(see figure 1) filter 5, cm, accept do is 1.2 cm;

Li- the length of the productive zone of the barrel horizontal wells;

k - factor duty cycle, taking into account that the development of high-viscosity oil pools is conducted through the upper perimeter of the filter 2, take k equal to 5.

Thus, substituting the values into the formula, we get the number of holes that are performed in the filter 5 in each of the first separate area:

NZ1=(0,85/0,85)·(4·154,5/3,14·1,22)120/5=3281 pieces

NZ2=(0,85/1,3)·(4·154,5/3,14·1,22)80/5=1430 pieces

NZ3=(0,85/2,0)·(4·154,5/3,14·1,22)60/5=697 pieces

NZ4=(0,85/3,2)·(4·154,5/3,14·1,22)140/5=1016 pieces

The distance between holes along the length of the filter 5 and the number of holes 4, 4', 4"...4nalong the perimeter of the filter are determined by calculation.

For example, for a zone of length L2with the number of holes NZ21430 units perform a radial series of holes 8 holes with a diameter of 20 mm around the perimeter of the filter 5 and at a distance of 0.45 m between rows of radial holes, i.e. (80 m/1430)·8=0,45 m Similarly carry out the holes in the filter 5 in the remaining zones with lengths L1, L3, L4.

All holes 4, 4', 4"...4nfilter 5 will be equipped with cutting tubes 6, 6', 6"...6n(figure 2 shows conditionally), i.e. set into the holes 4 of a cutting tube 6, 6'; 6"...6nfor example pressed cutting tube 6, 6', 6"...6nthe bottoms inside (see figure 2) into the holes 4, 4', 4"...4nfilter 5. Cutting tube 6, 6', 6"...6nmade of steel 35.

Then in holes 4, 4', 4"...4n(figure 1 and 2 shows the relative) filter 5 under cutting tube 6, 6', 6"...6ninstall mesh filter elements 7 (figure 2 shows conditionally), the number of which corresponds to the number of holes 4, 4', 4"...4nin zones 3', ", 3"', 3"".

Down in the drilled barrel producing or injection horizontal well 2 (figure 1) production casing 8 with the filter 5, is equipped with annular oil or swollen packers 9', 9", 9'"...9nrespectively and install them on the borders of zones 3', 3", 3'", 3"" productive stratum 1. For example, in areas 3', 3", 3'", 3"" establish three packer 9', 9", 9'".

As the annular oil or swollen packers are used, for example, the packers brand FREECAP firm THERE. These packers expand (swell), causing separation of the layers after exposure to high-viscosity oil or water on their sleeve, while the volumetric expansion of the packer reaches 200%.

Mesh filter elements 7 (see figure 2) is performed, for example, of a porous metalloproteinase material (PMF) and the porous sintered material (SL), made of stainless steel 316L or alloy with a high Nickel content, which allows them to withstand the most severe operating conditions in the horizontal production well. Mesh filter element 7 provides reliable and long-lasting prevention of sand.

The use of a porous oil or swollen packers excludes alternate landing packers by dropping from the mouth into the hole of the locking elements, as well as drilling and cementing plugs, saddles packers and reset the financial elements, to simplify, accelerate and reduce the cost of implementation of the method.

Landing casing oil or swollen packers occurs due to their contact with the oil in the producing horizontal wells or water injection in horizontal wells, which eliminates the use of fault elements for planting packers and the likelihood of their unpressurized landing on the seat of the packers, and this increases the reliability of the method.

Make the mount casing 8 (see figure 1) in the horizontal well 2 cementing 8' and 8", pre-filter 5 and for them accordingly. Leave horizontal well 2 on the waiting time of solidification, for example, cement mortar within 48 hours

Calculating the bandwidth of the filter 5, i.e. the square of the flow areas of the openings 4, 4', 4"...4nfilter 5 depending on reservoir characteristics of each zone 3', 3", 3'", 3"" of the reservoir, opposite which is a filter 5, improves the quality of drilling 1.

At the mouth of horizontal wells 2 gather the layout from the bottom up: the cutter 10, the bearing-centralizer 11, a downhole mud motor 12, a rigid centralizer 13, Put it in horizontal well 2 on the string of pipe 14 to the interaction of the cutter 10 with a cutting tubes 6 (figure 1 shows hematite).

As the downhole motor 12 is used, for example, engine brand D3-MR/8.37.

Have pumped process fluid, such as fresh water density of 1000 kg/m3in the string of pipe 14 through the pump unit, for example CA-320. Under the hydraulic pressure of the fluid in the string of pipe 14 actuate a downhole mud motor 12, which transmits the rotation of the cutter 10. Thus, removing the cutting tube 6 milling around the section throughout the filter 5. Then extract the string of pipe 14 with the layout.

In horizontal well 2 to the bottom 15 of the lower pillar pipe bending (unwind a flexible pipe on the drum setup) (figures 1 and 2, 3 are not shown), for example, a diameter of 38.1 mm

Then a column of flexible pipes move (wound on the drum of the unit with flexible pipe) from the bottom 15 to the mouth throughout the filter 2 (see figure 1) with the simultaneous injection of the cement composition, such as cement mortar 16 (see figure 3), the flexible tube for isolation of holes 4' (see figure 1), made in the lower perimeter of the filter 5.

Thus, in the horizontal well 2 cement mortar 16 flood the lower perimeter of the filter 5 over its entire length (L=400 m). At the end of the waiting time of hardening of the cement, for example 24 hours, the filter 5 (see figure 3) has scry the s holes 4 only along the upper perimeter of the filter 5 over its entire length (L=400 m).

The method of installation of the downhole filter in the horizontal well permits:

to improve the effectiveness of screening high-viscosity oil from the horizontal production well or injection of steam into the injection horizontal well;

- to improve the quality of drilling through selection or steam injection only through the upper perimeter of the filter with regard to porosity and permeability characteristics of the reservoir;

to simplify the process of installation of the downhole filter in the horizontal producing or injection well.

The method of installation of the downhole filter in horizontal wells, including drilling shaft horizontal wells, the descent into a drilled well casing, equipped with a downhole filter with cut plugs in the holes and packers, the fastening of the production string in the well with the position of the filter in the interval of the reservoir, remove cutting tubes in the holes in the filter, characterized in that in the process of drilling a producing or injection horizontal well determine reservoir characteristics reservoir and change the trunk horizontal wells, divide the wellbore into zones, which differ in porosity and permeability characteristics of 1.5-1.6 times, depending on the filtration-capacitive the x characteristics select the bandwidth of the holes of the filter separately for each zone and the number of holes, then into the holes of the filter under the plugs set mesh filter elements, which number corresponds to the number of holes in each zone, down in the drilled horizontal well production casing with filter, equipped with a porous water or Nefteyugansk packers, and install them on the borders of zones of different porosity and permeability characteristics, generate fastening of the production string, then at the wellhead gather the layout from the bottom up: cutter, bearing the centralizer, a downhole mud motor, rigid centralizer, the lower the Assembly to the column pipe all the way into the cutting tube, serves the process liquid in the string of pipe and through the downhole motor lead the rotation of the cutter, in the process of milling cutting tubes move the string of pipe down and remove the cut off filter tube throughout its cross-section, remove the string of pipe with the layout of the wells, then to bottom down a column of flexible pipes, drag from the bottom to the mouth with the simultaneous injection of cement composition on the column flexible pipes, which isolate the holes drilled in the bottom perimeter of the filter.



 

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