Browse Prior Art Database

Modified SPS-A Sampler

IP.com Disclosure Number: IPCOM000201115D
Publication Date: 2010-Nov-08
Document File: 3 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

One of the most important aspects of a well test program is the collection of a representative reservoir fluid sample. A sampling operation can encompass a number of possibilities. One aspect of sampling includes the collection of bottomhole samples. Bottomhole samples can be collected in one of two ways. In one embodiment a sampler is conveyed down hole by means of a sample carrier which is a piece of hardware associated as part of a drill stem test (DST) string. The carrier can be designed to convey multiple samplers with a wide range of quantities and volume. In another embodiment a sampler may be conveyed down hole by slickline or wireline. In this embodiment, between one and usually three samplers are run in the hole on a cable.

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-          TITLE

-          Method and apparatus for converting an existing tubing conveyed sampler to a slick/wireline conveyed sampler.

-          ABSTRACT

One of the most important aspects of a well test program is the collection of a representative reservoir fluid sample.  A sampling operation can encompass a number of possibilities.  One aspect of sampling includes the collection of bottomhole samples.  Bottomhole samples can be collected in one of two ways.  In one embodiment a sampler is conveyed down hole by means of a sample carrier which is a piece of hardware associated as part of a drill stem test (DST) string.  The carrier can be designed to convey multiple samplers with a wide range of quantities and volume. In another embodiment a sampler may be conveyed down hole by slickline or wireline.  In this embodiment, between one and usually three samplers are run in the hole on a cable.

Understandably, any service company wishing to present itself as a complete sampling capability provider needs to be able to provide a complete suite of sampling solutions, namely tubing and slick/wireline conveyed sampling.   For the sake of simplicity and practical expediency it would be advisable for both kinds of samplers to be based on the same technical platform.  Accordingly, this disclosure teaches the transformation through small modifications of a very reliable carrier carried sampler into a slick/wireline sampler.  

            DESCRIPTION OF INVENTION

Figure 1 below is a schematic of a very successful carrier conveyed sampler.

1             2             3          4             5          6            7              8           9           10            

   

Figure 1.  Carrier Conveyed Sampler.

In sequence the numbered items are as follows:

1.    Sample entry stinger

2.    Sample entry section

3.    Sample piston

4.    Displacement fluid

5.    Metering element – sampler center section

6.    Sampler center section

7.    Displacement piston

8.    Air chamber

9.    Nitrogen release section

10.  Nitrogen entry section

The sampler portrayed in Figure 1 requires two additional components to be fully functional, namely a trigger section that stinger 1 can stab into and a nitrogen section that stinger 10 can stab into.  The trigger is essential to control when fluid enters the sampler and the nitrogen section is crucial to keep the sampler single phase after it is collected.  However, because this is a carrier conveyed sampler, both the trigger and nitrogen section are part of the carrier and used to service multiple samplers.

In field performance the sampler is very reliable because it has proven internal components that have been tested under exacting circumstances.  Given the reliability of the sampler there is a considerable incentive to transform it to function in a slick/wireline mode.  For this purpose it is necessary that the sampler have a reliable st...