CN2100480U

CN2100480U - Pressure-guiding sand-blast packer for pressing crack

Info

Publication number: CN2100480U
Application number: CN 91223460
Authority: CN
Inventors: 赵恩远; 王凤山; 谢建华
Original assignee: OIL PROD TECH INST DAQING PET
Current assignee: OIL PROD TECH INST DAQING PET
Priority date: 1991-08-16
Filing date: 1991-08-16
Publication date: 1992-04-01

Abstract

The utility model relates to a pressure-guiding sand-blast packer for pressing crack used in a deep well of an oil field. The utility model is composed of a sand-blast body, a packer body and a flow nipple assembly. The utility model is characterized in that the sand-blast body and the packer body are connected into integration by an upper steel bowl and are provided with a pressure-guiding system so that the tool has dual functions of sand-blast and oil layer package; the external diameter from a sand blast opening to a sealing element is identical, and the distance between the sand blast opening and the sealing element is short, so a crack pressing post is not easy to seize sand; The inner part of the sand-blast body is provided with a sliding bush which can press seal and press crack step by step and can be used by multiple steps; meanwhile, the middle part of the tool is provided with a path which can be matched with the graded current limiting and crack pressing of a throwing blast-hole ball, so as to achieve the purpose of pressing crack on multiple layers at a time without moving a pipe post.

Description

Pressure-guiding sand-blast packer for pressing crack

The downhole tool that the utility model relates in a kind of oil field, deep well fracturing is used, it is chewed assembly three big parts by sandblast body, packing body, throttling and forms.

At present the oil field existing in, deep well fracturing sandblaster and packer respectively be single instrument, be connected to during use on the fracturing string, sand jet outlet is to the external diameter difference of seal, and both distances are bigger, fracturing sand easily is deposited in oil, sleeve pipe annular space, the easy sand card of tubing string; In existing, the deep well fracturing packer not step by step seat envelope function, sandblaster do not have sliding sleeve, can not multistagely use; Sandblaster does not have passage, can not be with to throw borehole ball classification current limliting pressure break supporting, and fixed tubular column once can only pressure break one deck, and efficiency of construction is low; Existing packer is a compression, and seal is seat envelope midway easily in the down-hole, and by upper lifting pipe post deblocking, it is bigger that down-hole string bears load after the pressure break.

The purpose of this utility model be to avoid the deficiency in the above-mentioned prior art and provide a kind of in, deep well fracturing is with pilot sandblast packer.

The utility model is chewed assembly three big parts by sandblast body, packing body, throttling and is formed, and upper steel bowl fuses sandblast body and packing body, and sand jet outlet is identical to seal outer diameter, and has shortened both distances, and tubing string is difficult for the sand card; In the sandblast body sliding sleeve is arranged, dropping into throttling and chew assembly, sliding sleeve is moved down, is sand jet outlet during the elongated slot on the sliding sleeve is relative with elongated slot on the pilot main body, hydraulic pressure can make packer set by the pressure guiding system conduction simultaneously, and this instrument has the double action of sandblast and oil-separating layer; Pilot sandblast packer has center-aisle, for the oil reservoir of fracturing string bottom, can throw the borehole ball earlier and carry out classification current limliting pressure break, again to other formation fracturings, but reaches the once purpose of pressure break multilayer of fixed tubular column, has improved efficiency of construction; This instrument seal is the expanding packing element, and the seat seal pressure is low, can upper and lower movable tubing string during the construction of down-hole.

The drawing of accompanying drawing is described as follows:

Fig. 1: pilot sandblast packer construction schematic diagram.

Fig. 2: the assembly structure schematic diagram is chewed in throttling.

Fig. 3: the on-the-spot fracturing string schematic diagram that uses.

The utility model is described in further detail below in conjunction with accompanying drawing.

Shown in Figure 1: the sandblast body by top connection (1), filter screen (2), pipe nipple (3), sealing ring (4), sliding sleeve (5), pin (7), pilot main body (9), form; The packing body is made up of upper steel bowl (10), central tube (11), seal (12), lower steel bowl (13), sealing ring (14), lower contact (15); Throttling chew assembly by throttling chew (20), sealing ring (21), (24), pin (22), plug (23) is formed.

Entire tool is by pipe nipple (3), upper steel bowl (10), lower steel bowl (13), be connected as a single entity top connection (1), conductor main body (9), central tube (11), seal (12) and lower contact (15).Sand jet outlet is identical to seal (12) external diameter, and this instrument has pressure guiding system and center-aisle.

Filter screen (2) links to each other with sliding sleeve (5) screw thread, and pin (7) connects together pilot main body (9) and sliding sleeve (5), and filter screen (2) has 16 road strias, has pressure transmission and sand control effect; The sliding sleeve middle and upper part has two elongated slots that communicate (16), and respectively there are step (17), (18) in one in the upper and lower part, and the groove of 8 dress sealing rings is arranged from top to bottom.

Pilot main body (9) is welded by inner and outer pipe, and it is sand jet outlet (19) that the middle part has two elongated slots that communicate, and pilot passage (8) is arranged between two pipes; Interior pipe has 8 pilot grooves bottom, is used for conducting hydraulic pressure, makes packer sealing, and there are 3 pin holes the upper end.

There are two sealed grooves central tube (11) upper end, and there is one section male thread the below of groove, links to each other with long steel bowl (10) screw thread, has four pilot elongated slots (6) on the screw thread.

Seal (12) is enclosed within outside the central tube (11), and upper and lower end links to each other with upper and lower steel bowl (10), (13) respectively.

The assembly external diameter is chewed in throttling and sliding sleeve (5) internal diameter size is supporting, need pressure break which floor just connects several pilot sandblast packers on tubing string, under the pressure break during one deck, assembly is chewed in the supporting throttling of throwing and next stage sliding sleeve earlier, make the work of this grade pilot sandblast packer, reach seat envelope, the purpose of pressure break step by step step by step.

During on-the-spot the use, this instrument can be formed the fracturing string of various ways with other downhole tool.

Wherein a kind of fracturing string when Fig. 3 has introduced on-the-spot use, it by pilot sandblast packer (27), hydraulic anchor (25), packer (26), packer (28), throttling chew (29) sleeve pipe (34), oil pipe (35) is formed.

Packer (26) is the inflatable packer of band sliding sleeve, and it and pilot sandblast packer are supporting, and the interval of pressure break is wanted in packing, and packer (28) is an inflatable packer.

After tubing string is gone into the well, throw borehole ball classification current limliting pressure break oil reservoir (30) earlier, (31), at this moment, packer (28) is chewed in the oil pipe that (29) causes by throttling, outer pressure reduction seat envelope, other packers are not worked, drop into the throttling that matches with subordinate's pilot sandblast packer (27) then and chew assembly, packer (26) seat is honored as a queen continues on the step (17) of descending seat in sliding sleeve, pin when pressure raises (7) is cut off, elongated slot (16) and elongated slot (19) centering, hydraulic pressure imports pilot passage (8) into by the stria of filter screen simultaneously, and 8 grooves from the interior pipe of pilot main body (9) lower end enter pilot elongated slot (6) again, make seal (12) expansion; Pressure continuation this moment is risen pin (22) is cut off, and plug (23) seat is gone on the step (18), plays plugging action, and throttling is chewed (20) and made the inside and outside connection of oil pipe, and can cause the tubing string inside and outside differential pressure, guarantees that packer continues sealing, can pressure break oil reservoir (32).

Assembly is chewed in the supporting throttling of input and higher level's pilot sandblast packer (27), repeats above-mentioned action, pressure break oil reservoir (33).Trip out the purpose that tubing string reaches the pressure break multilayer of once constructing after pressure break is intact.

The utility model compared with prior art has the following advantages:

Because the pressure guiding system in cooperating of assembly and sliding sleeve (5) and the instrument is chewed in throttling, can guarantee that sandblast chews sandblast, can guarantee that again seal seals, and makes this instrument that the double action of sandblast and oil-separating layer be arranged;

Sand jet outlet is identical to seal outer diameter, and both are apart from weak point, and tubing string is difficult for the sand card;

Easy construction during on-the-spot the use can upper and lower movable tubing string, has reduced the load of lift pipe string;

This instrument has step by step seat envelope, pressure break function step by step, can multistagely use, but construction pressure break multilayer has once improved efficiency of construction.

It simple in structure, pressure-bearing is high, the heatproof height, the sandblast amount is big, is hyposmosis, deep-seated oil, gas reservoir, the oil formation improvement that the oil reservoir interlayer is bigger provides means.

Claims

1, the pilot sandblast packer that the utility model relates in a kind of oil field, deep well fracturing is used, it is chewed assembly three big parts by sandblast body, packing body, throttling and forms, it is characterized in that: upper steel bowl (10) is connected as a single entity sandblast body and packing body, have pressure guiding system and center-aisle, sand jet outlet is identical to the external diameter of seal (12), and the sandblast body is made up of top connection (1), filter screen (2), pipe nipple (3), sealing ring (4), sliding sleeve (5), pin (7), pilot main body (9); The packing body is made up of upper steel bowl (10), central tube (11), seal (12), lower steel bowl (13), sealing ring (14), lower contact (15); Throttling chew assembly by throttling chew (20), sealing ring (21), (24), pin (22), plug (23) is formed.

2, pilot sandblast packer as claimed in claim 1, it is characterized in that: filter screen (2) links to each other with sliding sleeve (5) screw thread, pin (7) connects together pilot main body (9) and sliding sleeve (5), pipe nipple (3) upper and lower end respectively with top connection (1) and pilot main body (9) screwed connection, filter screen (2) has 16 road strias, sliding sleeve (5) middle and upper part has two elongated slots that communicate (16), and respectively there are step (17) in, (18) in the upper and lower part, 8 sealed grooves are arranged from top to bottom; Pilot main body (9) is welded by inner and outer pipe, and the middle part has two sandblast elongated slots (19) that communicate, and has pilot passage (8) between inner and outer pipe, and there are 3 pin holes interior pipe upper end, and there are 8 pilot grooves the lower end, and the outer tube upper and lower end has male thread.

3, pilot sandblast packer as claimed in claim 1 is characterized in that: there are two sealed grooves central tube (11) upper end, and one section male thread is arranged at the bottom of groove, has four pilot elongated slots (6) on the screw thread; Seal (12) is the expanding packing element.