SU1552030A1 - Method of interval hydraulic testing of column of drill pipes - Google Patents

Abstract

The invention relates to instrumentation engineering and allows for improved test performance and manufacturability of work. In the string of drill pipes include elements with a narrowing of the internal channel in the form of drill pipes with planted inside the ends. Transport in the column shutoff organ of elastic material. After its landing, a section of the column above the closure member is hydrotested to narrow the internal channel. The pressure is then increased beyond the test one before the valve is forced through the constriction. The locking organ is adjusted to the next narrowing, all operations are repeated. After squeezing the valve through the last narrowing, it reaches the bottom and goes into the well. 1 hp f-ly.

Description

The invention relates to a measuring and measuring technique and can be used for hydrotesting and determining the interval of leakage of a drill pipe string.

The purpose of the invention is to increase the productivity of tests and workability by eliminating the need to use elements with a narrowing of the inner diameter and locking bodies of various sizes, as well as using standard drill pipes with in-line ends as elements with a narrowing of the internal channel.

The method of interval hydraulic drilling of a drill pipe string is carried out as follows.

Elements with a narrowing of the internal channel are included in the string of drill pipes in the necessary heights, which are used as drill pipes with inward-set ends. Such pipes can be any number and in any places, they can be placed, for example, periodically after a certain length, in particular, the entire column can be composed of such pipes. After the descent of the column, it is dropped (after carrying out any technological operations, if necessary) a closure organ made of elastic material, for example a ball or a cementing plug, and, including pumps, is transported together with the washing liquid the closure organ before it is landed.

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its channel is landed inside the end of the pipe. The pressure in the column is increased to the test one and pressure testing is performed on the section of the column above the closure member by soaking under. this pressure given time. If the pressure in the column has not decreased, the entire section is recognized as airtight.

The circulation is then restored by increasing the pressure over the test one before pushing the valve through the narrowing of the inner canal, which is characterized by a pressure drop. The transport shut-off organ until the next narrowing of the internal channel and all operations are repeated.

In the event of a drop in pressure at the time of hydrotesting of the next section (the leakage of the drill-string between the valve body h is fixed by a previous pipe with inward-set ends. Since the location of these pipes is known, a defective area is easily identified. Particularly if consists of such (coarse, tightness is checked successively all the pipes of the column (and the column as a whole).

After squeezing through the latter, the narrowing of the internal channel, the locking organ reaches the bottom and goes into the well.

The proposed method can be used during the descent of a column into a well without a downhole motor and Chisel, which is possible either specifically for hydrotesting or for performing technological operations without mechanical drilling. The latter allows to combine hydro-tests with other technological operations and gives the maximum effect.

The effectiveness of the invention is to increase the productivity of the tests by using the same .Po and the same closure member for

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sealing in all places the narrowing of the internal passage, rapid restoration of circulation and reaching the next valve by the locking body, unlike the prototype, where a set of locking bodies of different sizes is needed, and pressing another part requires waiting until the next locking body reaches the channel narrowing.

Claims (2)

1. The method of interval testing of the drill pipe string, which consists in including elements with a narrowing of the internal channel in the column, transporting the stop valve in the column, when it is fitted to the narrowing of the internal channel, the pressure in the column is increased to the test one, pressure testing is performed. body, restore circulation, transport the valve to another narrowing of the internal channel, and pressurize another section of the column, characterized in that, in order to increase The number of tests is performed using a closure organ made of an elastic material, and the circulation is restored by increasing the pressure over the test body before pushing the closure organ through a narrowing of the internal channel and landing it on another narrowing. 2. Method according to claim, characterized in that, in order to improve the workability of the work, drill pipes with ends upset inside are used as elements with a narrowing of the internal channel. Editor A. Shandor Compiled by Y. Lysenko Tehred A. Kravchuk Proofreader I. Mueka Order 323 Circulation 447 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab; 4/5 Subscription