The method of producing the multilayer deposits at a later stage

 

The invention relates to the field of the oil industry, and in particular to methods of developing multilayer oil fields. Provides the most complete development of each layer of one well. The inventive method provides for the drilling of injection and production wells, injection of the displacing fluid injection and sampling of product formation via the production well. In the drilling process to expose the upper part of the clays, which are prone to shattering and swelling. Then drilled part of the well is fixed by the descent of the production string. Then continue drilling a bit smaller diameter and open fully productive layer of mud on the balance or depression with the aim of preserving the reservoir properties of the formation. In the process of drilling lowered below the production casing to determine the profitability of the layers operate gas logs. According to the results of the logging and analysis of sludge conclude a cease drilling or further deepening. If the reservoir profitable, you develop an open bottom with filling it with coarse sand. After full development of the reservoir and holding the e underlying layers. If the walls of productive formations are prone to shedding, they overlap profile perekryvatel or shank of legkousvojaemogo material. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of oil and gas industry, and in particular to methods of developing multilayer oil fields in the late stages of development.

There is a method of developing multilayer oil field [1], which includes drilling injection and production wells, injection of the displacing fluid into the injection well and the selection of products from combined into a single production facility several productive strata.

The disadvantage of this method, as correctly noted by the authors of the source of information [1], is that it is not possible to involve in active development of the reserves of all of the layers, as it developed only high-permeability layers or portions that fall on the line of cutting. In addition, due to the heterogeneity of the reservoir is impossible to develop water injection all formations opened injection wells.

These shortcomings are corrected in the way of developing multilayer oil field [2], including drilling nagassarium injection of the displacing fluid separately in each layer through one injection well and separate the selection of several oil sucker-rod pumps from each reservoir through one production well.

Not begging advantages of this method note that it has several shortcomings. Is it that it requires a descent of two parallel columns, consistent with their descent there is a risk of jamming and tightening. And 5’ production string, the application of parallel rows of tubes is not possible, this leads to the complication of ground equipment wells due to the need to install on the mouth 2 sets of wellhead equipment at a close distance, tripping, lifting of a number of parallel tubes increase the complexity of the work and underground repair of wells.

Due to the lack of reliable pakiruumi devices, as well as reliable surface and subsurface well equipment, the method has limited application.

This way the technical nature closer to the offer and may be accepted as a prototype because it provides the most complete development of each layer of one well.

However, an additional disadvantage of the prototype is that productive formations at autopsy, drilling, and when the fastening bore heavily polluted due to falling down of the drilling fluid and filtrate, and the products of hydration of cement,current products in development. At the late stage development of highly productive reservoirs are the most developed. At the opening of the perforation receive water-saturated products.

In addition, in the continuous development of the lower water-saturated layer of the wall of the production string almost the entire length is subjected to physical wear and tear due to aggressive products and round-trip operations in the implementation of various technological and repair works.

The present invention is to eliminate the above drawbacks of the prototype.

The problem is solved by the described method, including drilling injection and production wells, injection of the displacing fluid injection and sampling of product formation via the production well.

What's new is that the drilling reveal geological cross-section to the roof of the reservoir, located in the upper part of the section clays prone to shedding and swelling. Drilled part of the well is fixed by the descent of the production string. Then continue drilling to deepen a bit smaller in diameter to the full drilling (see drawing). With its open using a solution of Ravnopravie to its full output. After complete development of the reservoir is isolated highly permeable insulating compounds, such as swollen polymers, and cement. Next, a similar pattern drilling reveal and develop consistently the rest of the underlying oil-bearing stratum. After forming these layers by drilling reveal highly permeable water reservoir and well grow shank, fixed, after which they develop separately.

The method is distinguished by the fact that if uncovered the reservoir is prone to shattering, prior to the selection of oil it fix the filling of coarse-grained quartz sand or block profile perekryvatel, legkorazmyvaemykh shank (for example, aluminum, fiberglass or other material). If the two adjacent a productive formation of uniform permeability and are composed of hard rock, they have been jointly developing an open face.

The method is distinguished by the fact that in the process of drilling below are lowered and cemented columns carry out geophysical monitoring getcaretpos party and the results of the research determine the cessation of drilling or further deepening.

Prive well - 1 (№№1, 2, 3, 4). After opening the drilling of the upper part of the clay up to the roof of the productive formation produce the descent of the production casing and cementing. Further drilling will continue to deepen a bit smaller diameter to complete the drilling. In terms of clay - 3 lies reservoir. Above the cut clay overlain by carbonate rocks - 2. The reservoir in the upper part of the saturated oil - 4, and the bottom watered injected water - 5. In the drawing, the stack of layers is divided into 3 interlayer. In wells No. 1, 2 operational column - 6 perforated - 8, reservoir operated by the General filter. Due to the fact that reservoir properties (porosity, permeability) of the underlying layers is much better than the underlying layers, so these highly productive layers of highly vraboteni and flooding injected water - 5. Unproductive strata were not involved in the development of low collectorsa properties and imperfections in the opening. Well # 3 was drilled by the proposed method, where the upper part of the clay-lined production column - 6 and cemented.

First opened the reservoir in terms of clays developed as an open face the productive stratum Daboutafter complete development of the insulated swollen polymer composition 10 and after fixing with cement mortar the bottom hole dredged to a bottom part below the reservoir.

These reservoirs as a cost-effective and due to the homogeneity permeable and composed of solid rocks taken to operate an open bottom at the same time.

Clays have the ability to swell and crumble. Therefore, they must be open to high-quality clay, obsahovat the production column and cement.

The method is carried out in the following sequence.

Oil field razvarivat project net production and injection wells, and then carry out its infrastructure. After opening the drilling of the upper part of the clay up to the roof of the productive formation produce the descent of the production casing and cementing. Further drilling will continue to delve a bit smaller diameter to complete the drilling.

For the preservation of reservoir properties reservoir opening his conduct drilling mud balance or depression.

In the process of drilling below are lowered production casing carried out geophysical co is ukrasheniya drilling or further deepening.

In the case of profitability development of the reservoir oil extraction carried out through the open bottom with filling it with coarse sand. If exposed layer is exposed to falling, then its block, flat shank of legkousvojaemogo material (such as fiberglass, aluminum or other material). After complete development of the productive formation and implementation of insulation works by drilling on a similar scheme consistently reveal and develop other underlying layers and the stack of layers. Insulation work is carried out by injection of high-permeability of the composition, such as swollen polymer, followed by cementing. After forming these layers by drilling reveal highly permeable water reservoir and well grow shank, cement, after which they develop separately.

Literature

1. Book R. H. Muslimov, A. M. Savelieva, R. B. chisamba and other “Geology, development and exploitation of Romashkinskoye oil field”, Moscow, VNIIEM, 1995, volume 2, S. 243-244.

2. The book “separate Simultaneous operation of multiple zone oil fields”, in “the Depths”, M. 1974, S. 83, authors: R. A. Maksutov, B. E. Dobroskok, Y. C. hares.

 

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