SU30231A1 - Cement lamp for testing oil inflows in secured wells - Google Patents

Description

The present invention relates to flashlights for cementing exploratory wells according to a well-known method of Perkins when testing reef inflows in loose wells, and aims to achieve rotary drilling to test any oil location that is thick with a significant number of oil formations and strata, each of which must be tested for inflow with pre-isolation of the upper waters and without descent of the columns. Each well after testing can be emptied of a lantern, deepened to the next flow and re-tested.

FIG. 1 of the schematic drawing shows a general view and a longitudinal rim; cut lamp; Fig 2 - the location (bottom) of the traffic jams in the lamp.

The proposed lantern is made of Wood and consists of two upper double wood washers 7 with a sealing cuff 2 pinched between both parts and two lower same washers 3 with a sealing cuff #. The base of the lamp is a wooden washer 5. All three washers /,

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5 and 5 are fastened at respective distances from each other by four pillars 6.

A tube 7 passes through the upper / middle 3 washers, connecting with washer 5 by means of the left internal cutting of washer B, which, in turn, is attached to the lower washer 3 by means of four bolts 9. In washers 7 the pipe 7 is enclosed by sealing cuff W. Four holes 77 are made in the lower part of the pipe 7, connecting the cavity of the pipe 7 with the space between the washers 7 and 5, during which the pipe 7 has a left-hand thread that was screwed into the washer 5 to close the holes after the end of cementing.

At the lower end of the pipe 7 there is a cork 12 with a right-hand thread, screwed into the pipe 7 and fitted with handles 75. When closing the holes 7 /, the handles 75 are simultaneously unscrewed from the pipe end when the pipe 7 is rotated to the left, held in racks 6, to release the remaining 7 cement pipes.

At the upper end of the pipe 7 there is a coupling 14 for connecting the lamp with pipes, also having a left-hand thread, on which the lamp is lowered into the well (Fig. 1),

To test the oil inflow in any reservoir encountered during exploratory drilling, the lantern is lowered on left-handled pipes and installed on the bottomhole. The entire length of the lamp should be such that its upper washers / are located within the rock covering the roof of the formation to be tested. Before the operation to close the water through the pipes, clean water is supplied to the lantern, coming out through the openings // in the m auger space. The purpose of flushing and creating the best conditions for cement fixation is through the flow of water. Wash water flows between the walls of the well and cuff 2.

The closure of the water is achieved by cementing using the Perkyis method. To do this, cork 75 is inserted into the end of the pipe at the wellhead and cement is pumped into it with ordinary cementing fittings in an amount sufficient to fill the space between the washers 7 and 5 and form a layer above the washer 7. The main closure must be achieved with cement between the washers . A mixture of cement and clay is accumulated above the lantern, not giving full confidence in its impenetrability. After cement is pumped, a second plug 16 is placed on its level and all of this is driven downwards, and the water in the pipes goes through the holes -77 into the inter-washer space and further into the well space above the lantern. By passing the lower plug 75 of the holes 77, it will be installed above the plug 72, and the cement will LEAD after the water into the inter-washer space and further into the well.

When the stopper 16 reaches its lower position, the openings 77 will be closed and the flow of fluid will stop. This moment, marked by a pressure gauge, serves as a signal for the end of cementation (Fig. 2).

At the end of cementation, turn the pipe 7 to the washer 8 by turning it to the left until it closes the holes / 7. At the same time, thanks to the right-hand threading, the cork 12 is screwed in and falls on the bottom. Now after that, a rod is pulled down on the tartar rope, which is pushed out of the pipes 7 into the lamppost of the cementing corks. Farther; hardening of the cement follows with a closed mouth of lampposts using cemented reinforcement.

Trial testing of the oil inflow is carried out by a jacking tartan or a deep pump according to the rules of well operation. At the end of the well test, the lantern tubes are near, removed, and the lantern is destroyed.

The subject matter of the invention.

- A lantern for cementing when testing oil inflows in loose wells, consisting of two double wooden washers with sealing cuffs and a wooden base, fastened together by four vertical wooden racks, characterized by the use of internal washers 8 with internal left-handed cutting , attached by four bolts 9 to the bottom washer 3, with the bottom of the pipe 7, to pump into the space between the washers 1 n 3, holes 77 are made, and for closing, neither holes 77 after the end of cementing, rub and 7, over these holes, has a long left-hand threading screwed into the washer 8, for the purpose of releasing the cement left in the pipes.7 a plug 72 was used with a right-hand thread and with the handles 13 unscrewed simultaneously with the opening 77 from the pipe end during rotation pipe left.