RU2095565C1 - Sampler for bed tester - Google Patents

Abstract

FIELD: oil and gas industry. SUBSTANCE: this relates to bed liquid sampling at drilling oil and gas wells, at testing operations with using tube-type bed testers. Installed between multiple-cycle bed tester and its equalizing valve interlocked with shut-off valve are drill pipes having threaded seat and locking needle. After raising to surface, locking needle is unscrewed and gas is released with taking its samples. After pressure is fully released, sampler (drill pipes) is unloaded prior to opening of shut-off valve from underneath. Outflowing liquid is then sampled (if necessary). Use of sampler allows for taking samples considerable in their volume. EFFECT: high efficiency. 1 dwg

Description

 The invention relates to the drilling of oil and gas wells, in particular, to their testing during drilling by pipe testing of formations.

 Samplers for sampling are known [1] (p. 101). Samplers are installed in a set of testing equipment for the purpose of sampling reservoir fluid under downhole conditions.

The following sampling methods are available at the well intake:
methods using special samplers in the form of separate assembly units;
methods using standard samplers methods related to sampling in a closed container located between the shut-off valve and the formation tester.

 Well-known formation testers [1] (p. 67). The formation tester includes two main components: a hydraulic time switch and a valve assembly. Valve assembly is a device containing equalizing and receiving valves. This unit is designed so that if the equalizing valve is open, the receiving valve can only be in the closed position.

 Known IPGs of the first assembly differ from IPGs of the second assembly in that the holes of the equalizing valve are plugged in the last [2] (p. 79).

 After 1 5 min. (after unloading the tool to the face), the IPG first assembly time relay is triggered, its equalizing valve closes and then the receiving valve opens, which allows fluid to pass from the formation to the pipes (empty) located between two hydraulic formation testers.

 After a certain time, the relay of the second IPG assembly is activated, and the reservoir fluid enters the drill pipe.

Known valve locking and rotary multi-cycle ZPKM2-146 [3] (hereinafter ZPKM2-146) is intended for:
1) multiple call fluid flow from the reservoir;
2) multiple acquisition of reservoir pressure recovery curves without removing the load from the packer;
3) selection of a sealed formation sample;
4) a multi-cycle test of several objects in one run, if the first ones turn out to be powerless.

 The device and operation of ZPKM2-146 and its main parts.

The concept of ZPKM2-146 incorporates the conversion of the rotational movement of drill pipes and rods into the reciprocating movement of its individual elements. ZPKM2-146 includes four valves that differ in purpose and principle of operation:
1) the main inlet valve, which is controlled by the rotation of the drill pipe;
2) equalizing valve;
3) additional shut-off valve. Equalization and auxiliary valves are controlled by vertical movement of drill pipes;
4) bypass valve, designed to automatically maintain the pressure differential between the internal insulated cavity of the product and the bottomhole space. The bypass valve is adjusted in such a way that an excess pressure of not more than 3 MPa is maintained in the inner cavity of ZPKM2-146, and not more than 20 MPa from the outside.

 In all cases, when drawing up any line-up with the inclusion of ЗПКМ2-146, the use of a hydraulic formation tester is excluded.

 Maintenance ZPKM2-146, transfer of the sample to the container, etc. carried out in a production workshop or at a drilling site using available means of mechanization of work.

 Multi-cycle testers of the MIG size range, more precisely their sets, do not contain a shut-off and rotary valve. Closed periods are provided by a stretch tool.

 In general, any set of tubular test instruments should have four valves: a main inlet valve, a shutoff valve for closed periods, and equalizing and circulating valves. The latter is performed as a separate unit.

 In multi-cycle ZPKM2-146 and MIG, the main inlet valve also functions as a shut-off valve. Both are also equipped with a balancing valve. In fact, both of them are multi-cycle reservoir testers, ZPKM2-146 should be called a multi-cycle rotary reservoir tester, and IPM-146U from the MIG kit is a multi-cycle hydraulic reservoir tester.

 Both ZPKM2-146 and MIG do not form the closed capacity mentioned by source 1, which is the analogue of the invention.

 An essential feature of the analogue, consistent with the invention. The sample is locked in a closed container by the nodes of the pipe formation tester.

 An essential feature of the invention, different from the analogue. Mentioned source 1 valve assembly without a hydraulic time switch is installed under the capacity of the drill pipe, and above it a multi-cycle formation tester without equalizing valve.

 The technical result will be expressed in an increase in the volume of the raised sample, as well as in the widespread use of a multi-cycle rotary bed tester, the use of which removes the restriction on unloading the tool during its descent.

 The reasons that impede the receipt of such a technical result, the applicant can not specify.

 The essence of the invention lies in the fact that between the multi-cycle reservoir tester and its equalizing valve, blocked with a receiving valve, according to source 1, drill pipes are installed. Pressure relief and sampling of gas and partially liquid is carried out through a threaded socket, locked by a needle, which are built into the sub with standard threads. When installing two such sub with threaded sockets, it is possible to transfer the fluid under pressure into the container.

 The drawing shows a section of a threaded socket with a locking needle built into the sub with standard threads.

 A threaded socket with a locking needle in the sub at the suggestion of the applicant was made and tested in 1970 by the Belorusneft association.

 Decision of March 22, 1971 on the application N 1469984 / 22-3. The Mining Department of VNIIGPE found no reason to issue a copyright certificate for this device, which was installed between the IPG of the first and second assembly. Since 1976, on expeditions of the Arkhangelskgeologiya association, a device was installed between the IPG and a two-cycle shut-off and rotary valve.

 In August 1996, this device was installed between the IPG and ZPKM2-146 without equalizing valve and twice raised the oil sample under pressure in the drill pipe.

 Between the IPG and ZPKM2-146, a deep sampler was installed in the drill pipe with a pin cut off by pressure close to the reservoir, which required lowering the ZPKM2-146 with the main drain valve open. ZPKM2-146 was the first model and did not contain other valves mentioned by source 3.

With serial production, the following units will be included in the set of a multi-cycle rotary reservoir tester with a sampler:
1) ZPKM2-146 with one main inlet valve without equalizing valve;
2) IPG (hydraulic bed tester) without a time switch or without an oil chamber;
3) two sub with threaded sockets and locking needles;
4) three to four nozzles instead of a drill pipe.

 When using a multi-cycle hydraulic formation tester, it is possible to use the first and second assembly IPG with plugged openings of the equalizing valve.

 With international patenting, these products will be patented.

 Sampling at the mouth. The safety plug is turned out of the threaded socket, a fitting with a rubber hose is screwed into it. Turning off the needle, the gas dissolved in the sample is admitted. Gas samples are taken into the bottle, dropping it into the water. Together with the gas, a clean liquid is also ejected from the rubber hose, as sediment settles in the drill pipe.

 Having completely relieved the pressure, the bottom of the sampler is sent to the container and unloaded until the inlet valve opens, through which the liquid from the sampler is drained into the container.

 To transfer the sample into the container between the drill pipes, a nozzle is installed with two subwoofers screwed in with threaded sockets and locking needles.

Claims (1)

 A sampler to the formation tester, including a formation tester with valves: the main inlet, equalizer and receiver and drill pipes, characterized in that the drill pipes are equipped with one or two sub with threaded sockets and locking needles, the formation tester is multi-cycle, its equalizer and receiver valves are blocked and drill pipes are installed between the multi-cycle formation tester and its interlocked equalizing and receiving valves.