SU1730429A1 - Bottomhole design - Google Patents

Abstract

The invention relates to a well construction. The goal - reducing the complexity of the work. After drilling a well, the production string 1 is lowered to the top of the production object 4 and is cemented. Next, the productive object is drilled with 4 bits, the diameter of which is smaller than the internal diameter of the production string 1. after which it is expanded with sliding expanders. Work on measuring the actual diameter of the well bore. Assembling a perforated casing (POS) pipe metal 3 with memory

Description

The invention relates to oil and gas production and can be used in the construction of wells.

A well bottom design is known, including a production string lowered to the roof of a production object, a secret column with perforated holes (slits) installed against the production object, the outer diameter of the secret column being less than the diameter of the well bore

However, s of this design, the internal diameter of the perforated casing is significantly smaller than the inside diameter of the production casing, which determines the low productivity of the well and complicates its maintenance and operation.

Since the annular gap is present, the pressure but the wall of the well during its operation decreases and, over time, the wellbore zone of the well collapses. A poorer one also leads to the destruction of the pshach column.

Closest to the proposed well design, which includes an operational column, lowered to the roof of the productive object, an extended wellbore in the interval of the productive object, a secret perforated casing string installed against the interval of the productive object, while preventing the annular space to prevent formation destruction. behind a secret column they fill a gravel-sand filter. The well-known well construction has the following disadvantages: the laboriousness of work on creating a gravel-sand filter is high; as the gravel-sand filter is in operation, the well is reduced and the productivity decreases, the small diameter of the blind column determines the low productivity of the well and complicates its maintenance and operation.

The purpose of the invention is to reduce the labor intensity and increase the productivity of the well.

This goal is achieved by the fact that in the well design, which includes a production string, lowered to the roof of the productive object, an expanded borehole in the interval of the productive object, a perforated column installed against the interval of the productive object, the perforated casing string is made

of metal with a memory that restores the original shape after its descent into the mounting interval, the outer diameter of the perforated casing string of the original cylindrical shape being equal to the diameter of the wellbore, and the inner diameter is larger than the inner diameter of the production string.

The principle of the metal with memory is as follows.

It is known that there are metallic alloys in which inelastic deformations are completely restored when the load is removed or heated, i.e. metal, recollecting, acquires its former form. This phenomenon, found in many pure metals, alloys and metallic compositions, is called a shape memory effect.

FIG. 1 is shown schematically

proposed downhole design; in fig. 2 is a section A-A in FIG. one; in fig. 3 - the secret column deformed before descending into the well; in fig. 4 is a section BB in FIG. 3 (largest transverse diameter

the deformed column is smaller than the internal diameter of the production string).

The bottom hole design includes production string 1, extended

a borehole 2 in the range of a production object 4 and a perforated string of 3 casing.

After drilling a well, the production string 1 is lowered to the top of the production object 4 and cement it. Next, the production object 4 is drilled with a bit, the diameter of which is less than the internal diameter of the production string 1, after which the

its sliding spreaders. Perform work on measuring the actual

borehole diameter. Perforated casing is assembled from 3 metal pipes with a cylindrical memory with an outer diameter equal to the diameter of the expanded borehole. Before descending into the well, the perforated column 3 is shaped with transverse dimensions, ensuring its free descent into the interval of the bedding of the productive object 4. Using an electric heater or by other means, the memory rod is heated to the calculated temperature. At the same time, the rod with memory restores its original shape.

Example. Drilling under the production string to a depth of 2000 m is performed with a chisel 0 215.9 mm. The production column is lowered to the specified depth from 0 168 mm pipes with a thickness of 10 mm and is cemented. The underlying production object is drilled with a chisel of 0 145 mm to the design depth of 2020 m. Then the borehole is expanded with sliding expanders to a diameter of 0 250 mm. A perforated column with a length of m and dimensions MM, mm is made of metal with memory. The column is deformed, giving the cross-sectional view in FIG. 4 with the largest cross-sectional diameter e) of 140mm, which ensures an annular gap of 4 mm, with an inner diameter of the production string of 148 mm and, consequently, free transport of the standpipe to the depth of the productive object. Descend the deformed column on the cable into the well until it stops with the bottom, Turn on the electric heating system. After a certain period of time, the secret column restores its original cylindrical shape with an outer diameter of 250 mm.

Economic efficiency from the implementation of the proposed technical solutions

neither is determined by the additional well flow rate. According to the Dupuis formula, the flow rate Q is inversely proportional to the natural logarithm of the relationship between the radius of the power loop (RK) and the radius of the well (rf), on the basis of which the performance of the well with an increased radius rci, all other conditions being equal, is determined by the expression

In

Q

Jk

rci

In

Jk

Gs1

Accepted m, .145 m, receive, 08Q.

Thus, an increase in productivity is achieved due to the implementation of the proposed technical solution.

Claims (1)

Invention Formula The bottom hole design, including the production string, lowered to the roof of the productive object, an expanded well bore in the interval of the productive object, the perforated casing string installed against the interval of the productive object, so as to reduce the labor intensity and increase productivity the well, the perforated casing string is made of metal with a memory that restores the original shape after descending into the mounting interval, moreover, the outer diameter of the perforated casing of the original cylindrical shape is equal to the diameter of the wellbore, and the inner diameter is greater than the internal diameter of the production string. X (Reg. 2 6-5