The way the secondary opening of productive layers

 

(57) Abstract:

The invention relates to the field development of reservoir fluids (oil) gas, water and others) and can be used during the operation of multilayer deposits. Provides extended field of application of the method due to the possibility of its use in the development of multilayer deposits, productive formations are overlain by intermediate casing strings. Down and plugging in the drilling process intermediate and production casing to supply against all productive formations filters, plugs, destroyed by chemical means. The filters provided with centralizers. In the process of plugging annular space in the interval filters fill not hardening solution. Secondary completion is carried out by gradual destruction of stub filters and removal of the annular spaces special not hardening solution. 1 Il.

The invention relates to the field development of reservoir fluids (oil, gas, water and others) and can be used during the operation of multilayer deposits. Known SPO the column filter with holes, blocked cyclotrisiloxane plugs, and placement in the annular space against the filter of cement with addition of polyvinyl chloride in the amount of 10-20% by weight of cement after hardening last carry out thermal degradation of polyvinyl chloride /1/.

The disadvantage of this method is the impossibility of its application in overlapping productive layers multiple casing strings.

Closest to the described method is a method of secondary opening of productive strata, including the descent into the well and plugging intermediate casing, and production casing to supply the latter against each productive stratum filters, plugs, destroyed by chemical means, and the secondary completion by destroying plugs /2/.

The disadvantages of this method is that it can be applied only when the overlap of the productive strata one casing (operational) column, and for the successful construction of wells, it is often necessary to overlap the upper productive strata intermediate casing strings with their subsequent cementing (Campanian opportunities for its use in the development of multilayer deposits, productive formations are overlain by intermediate casing strings.

Required technical result is achieved in that in the method the secondary opening of productive layers, including the descent into the well and plugging intermediate casing, and production casing to supply the latter against each productive stratum filters, plugs, destroyed by chemical means, and secondary completion by the destruction of the plugs according to the invention in the process of building well equipped with filters with stubs against the productive layers and the intermediate casing, filters, supply units, and in the process of plugging the column spacing in the range of filters fill not hardening solution, and secondary completion is carried out by gradual destruction of stub filters and removal of the annular spaces not hardening solution.

The drawing shows the circuit implementation of this method secondary opening of productive strata, showing: I - the lower reservoir, II - medium reservoir. III - the upper reservoir, 1 - usage of the casing upper productive formation; 6 - filter of the second intermediate casing middle of the formation; 7, 8, 9 filters casing top, middle and bottom of productive layers, respectively; 10, 11, 12 - backfill material intermediate casing and the production string. Accordingly, the 13 - special not hardening solution, 14 - centralizers filter, 15 - column tubing, 16 - packer, 17 - circulating valve, 18 - valve, 19 - chemical reagent.

The invention consists in the following.

For the development of multilayer deposits are drilling wells with the descent and plugging the required number (drilling conditions) intermediate casing 2, 3 and operating 1 columns. Each of the intermediate (2, 32) and the production casing 1 is equipped against the productive layers I, II, III filters 4-9 with centralizers 14, holes filter supply caps, destroyed by chemical means. When plugging the casing intermediate columns 2 and casing 1 in the grouting material (cement mortar) 11, 12 add not hardening solution 13 in such amounts and in such a way that it is in column spacing in the range of filters. As netviper stable mud with physical properties, close to the properties of the backfill material in the process of sequential feeding into the annular space grouting and not hardening solutions did not result in mixing. The use of not hardening solution provides quick removal and access of the chemical reagent to stub filters the intermediate casing in the secondary drilling formations.

The filters are equipped with centralizers to prevent stub filter from mechanical damage when the shutter casing and production casing and ensure uniform plugging annular spaces.

For secondary opening of productive formations message them with a well) in a well in the interval of the reservoir connected to the development in accordance with the field development project the sequence of their development (drainage), serves a chemical reagent (e.g., hydrochloric acid, caustic soda and other). Under the action of a chemical reagent plugs filters are destroyed. The time of the destruction of stub determined empirically for the particular material and used chemical reagent. After the destruction of the stub filter between productive commissioning.

At the opening of the upper productive layers, for example, in the diagram layer III, after the destruction of the first portion of the chemical reagent blanks filter 7 of the casing 1 is removed from the annular space (between the operational and the second intermediate casing strings) not hardening solution 13. Then in this same interval the second portion of the chemical reagent, destroy stub filter 5 second intermediate casing 2, remove the special solution 13 from the space between the first and second intermediate casing strings, and then served another portion of the chemical reagent, destroy stub filter 4, the first intermediate casing 3 and proceed with development and commissioning of the productive formation III.

When there are potential difficulties in removing the cement from the annulus between the destructible plugs and the walls of wells in the process of development of the productive layers of backfill material directly overlying the reservoir, add material, destructible used chemical reagent, such as sawdust material from which made the stub filters.

An example implementation of the method.

Has the 50 m, average - gas-condensate reservoir thickness HCC= 40 m and the lower oil layer thickness Hn= 20 m On the drilling conditions at the construction of wells gas and gas-condensate reservoirs are overlapped with the first and second intermediate casing strings, oil reservoir pipe casing. All columns in the range of productive formations equipped with filters with plugs from aluminum alloy. The diameters of the columns: Dn= 244,5 mm, DB1= 224,5 mm - outer and inner first intermediate, respectively; DH2= 173,7 mm - outer and inner second intermediate, respectively; Dne= 146,1 mm, Dve= 126,0 mm - outer and inner diameter of the production casing, respectively. For the destruction of the plugs filters use a solution of caustic soda, served in the interval filters on the column tubing (tubing) (outer diameter tubing - d = 73,0 mm

Defined:

volumes not hardening solution (use a solution with addition of a stabilizer, such as polyacrylamide) to fill the annular spaces in the interval filters when plugging casing:

for annular space intermediate casing in the Onna columns in the interval of the gas reservoir;

for the annular space of the second intermediate casing, and production casing in the interval of gas condensate reservoir.

The volume of chemical reagent (caustic soda) for the destruction of stub filters:

for a filter casing in the interval of the gas reservoir;

Vp2= Vp1+Vr2= 0,41+0,35= 0.76 m3- to filter the second intermediate casing in the interval of the gas reservoir;

Vp3=Vp1+Vr2+Vr1=0,41+0,35+0,5=1.26 m3- to filter the first intermediate casing in the interval of the gas reservoir;

for a filter casing in the interval of gas condensate reservoir;

Vp5= Vp4+Vr3= 0,33+0,28= 0,61 m3- to filter the second intermediate casing in the interval of gas condensate reservoir;

- for a filter casing in the interval oil reservoir.

Before the second opening of the desired layer is prepared as a chemical reactant in the calculated volume in the well on the tubing string 15 (see drawing) descends packer (16) with inverse (18) and a circulating valve (17). The packer is set below the breakable seam. Then, for example, for opening the gas reservoir III across the 1 within the range of its filter 7 pump first portion of the chemical reagent 19 - solution of caustic soda (Vp1= 0,41 m3). After the exposure time required for destruction (dissolution) of the caps of the filter casing, the circulation of process water to produce cleaned well from the reaction products and not hardening (clay) solution annular space between the operational and the second intermediate casing strings. Then in the interval filter is a second portion of a solution of caustic soda (Vp2= 0.76 m3), according to the described technology open up holes in the filter of the second intermediate casing, and after washing the wells, and the filing of the third portions of a solution of caustic soda (Vp3= 1.26 m3) similarly reveal the holes in the filter of the first intermediate casing. After the liberation from the stub holes all filters secondary opening of the gas layer is finished, then move to the development and commissioning.

The use of this method allows to produce a secondary opening of productive layers in any desired sequence and at any stage of the life of the well, which can be implemented in various schemes for developing multilayer deposits: owls is>Sources of information

RF patent N 2083806, CL E 21 B 43/11, 10.07.97.

RF patent N 2100580, CL E 21 B 43/14, 27.12.97.

The way the secondary opening of productive layers, including the descent into the well and plugging intermediate casing, and production casing to supply the latter against each productive stratum filters, plugs, destroyed by chemical means, and secondary completion by destroying plugs, characterized in that in the process of building well equipped with filters with stubs against the productive layers and the intermediate casing, filters, supply units, and in the process of plugging annular space in the interval filters fill not hardening solution, and secondary completion is carried out by gradual destruction of stub filters and removal of the annular spaces not hardening solution.

 

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FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling perforation channels in wall of casing string and behind-pipe space, by drill. Drill is extended after each deepening for a length of its rod. Assembly for feeding drill is detached from received combined rod, left in drilled channel. Drill is provided with guiding elements, placed at distance from each other for keeping drilling direction. Firstly, wall of casing pipe is drilled by cutting portion of guiding element when it is in conductor of feeding assembly. With displacement into wall of casing string, another guiding element is inserted into conductor. With drilling of casing string, concurrent presence of guiding elements in feeding assembly conductor and in formed channel is provided for, said channel being used as conductor for drill after exit of guiding elements from feeding assembly conductor. Device has drilling perforator, containing electronic block, electric drive, fixing assembly, assembly for feeding drill with conductor, and case block with inbuilt cases containing drilling rods and drill. Drill is provided with guiding elements, having elliptic shape, placed at distance from each other along drill axis and turned relatively to each other for 90.

EFFECT: higher reliability.

2 cl, 6 dwg

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