阅读说明：本技术 一种新型深水井口设备 (novel deep water well head equipment ) 是由 弓大为 樊霞 于 2018-06-04 设计创作，主要内容包括：本发明涉及石油井设备设计技术领域,特别涉及一种新型深水井口设备。在本发明的设计中,低压井口头返流孔外侧的弧形结构用于防止水合物上窜；高压井口头内侧分散承重,各层套管挂自带承重锁环的设计增加了高压井口头总的承载能力满足了更深水域的作业需求,也可以解决防腐的要求；高低压井口之间的刚性锁紧环可以同时满足普通作业需求以及深水锁紧增强抗弯能力的要求；通用密封总成可以满足不同层位套管挂环空的密封要求。(The invention relates to the technical field of petroleum well equipment design, in particular to novel deepwater wellhead equipment. In the design of the invention, the arc-shaped structure outside the backflow hole of the low-pressure wellhead is used for preventing the hydrate from flowing upwards; the inner side of the high-pressure wellhead head is subjected to dispersed load bearing, and the total bearing capacity of the high-pressure wellhead head is increased by the design that each layer of sleeve is hung with a bearing lock ring, so that the operation requirement of a deeper water area is met, and the requirement of corrosion resistance can be met; the rigid locking ring between the high-pressure well mouth and the low-pressure well mouth can simultaneously meet the requirements of common operation and deepwater locking and bending resistance enhancement; the universal sealing assembly can meet the sealing requirements of different layer casing string annular spaces.)

1. A novel deepwater wellhead device is characterized by comprising a low-pressure wellhead, a high-pressure wellhead, a first casing hanger, a second casing hanger, a third casing hanger, a universal sealing assembly and an anti-wear bushing,

The high-pressure wellhead head is provided with a high-pressure wellhead head locking ring groove, a first high-pressure wellhead head connecting interface and a high-pressure metal sealing surface, the lower end of the high-pressure wellhead head is provided with a bearing step surface, a sealing ring is additionally arranged on the outer side of the high-pressure wellhead head, the high-pressure wellhead head locking ring groove, a first high-pressure wellhead head locking ring groove, a locking ring groove and a second high-pressure wellhead head locking ring groove, the second high-pressure wellhead head locking ring groove is arranged above the high-pressure wellhead head locking ring groove, the locking ring groove is arranged at the upper end of the high-pressure wellhead head and below the high-pressure metal sealing surface, and the high-pressure wellhead head is also provided with an inner sealing surface of the high-pressure wellhead head, which is used for being matched with the outer sealing point to realize metal sealing;

The second casing hanger is provided with a support locking ring, the support locking ring is provided with a locking ring bearing step, the support locking ring is matched with the high-pressure wellhead head locking ring groove for use, the support locking ring can be locked into the high-pressure wellhead head locking ring groove under the action of the support ring, the third casing hanger is provided with a top outer step, a casing hanger outer sealing surface, a casing hanger inner step, the outer side of the third casing hanger is provided with a casing padlock ring groove, the inner side of the third casing hanger is provided with a third casing padlock ring groove, the outer side of the middle part of the third casing hanger is also provided with a locking ring, and the locking ring is provided with a locking ring support inner step;

The universal seal assembly is provided with a seal assembly main body inner step and a mounting hanging step, the universal seal assembly is provided with a first lock ring, a second lock ring, an outer lock ring and an inner lock ring, the first lock ring is arranged above the outer side of the second lock ring, an outer seal point is arranged on the outer side of the universal seal assembly, a seal assembly inner seal point is arranged on the inner side of the universal seal assembly, and the outer seal point and the seal assembly inner seal point are oppositely arranged.

2. The novel deepwater wellhead equipment as claimed in claim 1, wherein the number of the sealing rings is two.

3. The novel deepwater wellhead equipment as claimed in claim 1, wherein the upper end of the backflow hole is designed with a cambered surface, so that the hydrate is prevented from directly jumping up along the outer side of the low-pressure wellhead head to cause damage to other equipment.

4. The novel deepwater wellhead equipment as claimed in claim 1, wherein a recovery feeding groove is formed in the top of the inner step of the casing hanger for taking and feeding the wear-resistant core.

5. The novel deepwater wellhead device as claimed in claim 1, wherein the low-pressure wellhead body, the high-pressure wellhead body, the first casing hanger, the second casing hanger, the third casing hanger and the universal seal assembly are made of corrosion-resistant alloy steel.

Technical Field

The invention relates to the technical field of petroleum well equipment design, in particular to novel deepwater wellhead equipment.

Background

With the development of the national ocean strategy to deep water, the development of deep water oil and gas fields gradually moves to deeper sea areas, oil and gas exploration in China shows that the deep water sea areas at the east and the west of the south sea have larger reserves, China general oceanic oil companies, China general oil companies and China general petrochemical companies pay more and more attention to the development of the deep water oil and gas fields, and particularly, the China general oceanic oil companies are found in the deep water sea areas at the west of the south sea and the mouth of the Zhujiang river in recent years. However, deep water oil and gas exploration and development equipment in the longitudinal market is a clear European and American product, and sometimes the products are monopolized by the technology of the European and American countries, the domestic oil companies are limited in terms of purchasing period and technical support, even sometimes the project period can only be delayed because the products cannot be purchased in time, the technical support cannot be obtained in time when the products are used on site, and the small problems are changed into big accidents, so that extra cost is increased.

In addition, only five companies, namely the united states and norway, are currently available on the market, and although their products have already become mature, they have many disadvantages. Aiming at a well mouth of a deep water well drilling completion, well mouth equipment required by deep water has large bearing capacity, high bending strength, high corrosion resistance requirement and high working temperature and working pressure requirement. On the bearing step of high pressure well head, the carbide that their adoption inlayed improves bearing capacity, but carbide's corrosion resisting property is restricted, still utilizes the locking ring of annular seal assembly to provide the support, and its inner space will diminish like this, has increased the degree of difficulty of running into the instrument and sitting and hanging follow-up operation. The rigid locking of the matching at the high-low pressure wellhead head is complex, and the design is lacked in the aspect of waterproof compounds.

Disclosure of Invention

in view of the above problems, the invention provides a novel deepwater wellhead device which increases the total bearing capacity of a high-pressure wellhead head to meet the operation requirements of deeper water areas, meets the requirements of common operation and deepwater locking and bending resistance enhancement, meets the sealing requirements of casing hanging ring spaces at different layers, and solves the corrosion prevention requirement.

in order to achieve the above object, the present invention provides the following technical solutions:

The invention relates to a novel deepwater wellhead device, which comprises a low-pressure wellhead head, a high-pressure wellhead head, a first casing hanger, a second casing hanger, a third casing hanger, a universal sealing assembly and an anti-wear bushing,

The high-pressure wellhead head is provided with a high-pressure wellhead head locking ring groove, a first high-pressure wellhead head connecting interface and a high-pressure metal sealing surface, the lower end of the high-pressure wellhead head is provided with a bearing step surface, a sealing ring is additionally arranged on the outer side of the high-pressure wellhead head, the high-pressure wellhead head locking ring groove, a first high-pressure wellhead head locking ring groove, a locking ring groove and a second high-pressure wellhead head locking ring groove, the second high-pressure wellhead head locking ring groove is arranged above the high-pressure wellhead head locking ring groove, the locking ring groove is arranged at the upper end of the high-pressure wellhead head and below the high-pressure metal sealing surface, and the high-pressure wellhead head is also provided with an inner sealing surface of the high-pressure wellhead head, which is used for being matched with the outer sealing point to realize metal sealing;

The second casing hanger is provided with a support locking ring, the support locking ring is provided with a locking ring bearing step, the support locking ring is matched with the high-pressure wellhead head locking ring groove for use, the support locking ring can be locked into the high-pressure wellhead head locking ring groove under the action of the support ring, the third casing hanger is provided with a top outer step, a casing hanger outer sealing surface, a casing hanger inner step, the outer side of the third casing hanger is provided with a casing padlock ring groove, the inner side of the third casing hanger is provided with a third casing padlock ring groove, the outer side of the middle part of the third casing hanger is also provided with a locking ring, and the locking ring is provided with a locking ring support inner step;

the universal seal assembly is provided with a seal assembly main body inner step and a mounting hanging step, the universal seal assembly is provided with a first lock ring, a second lock ring, an outer lock ring and an inner lock ring, the first lock ring is arranged above the outer side of the second lock ring, an outer seal point is arranged on the outer side of the universal seal assembly, a seal assembly inner seal point is arranged on the inner side of the universal seal assembly, and the outer seal point and the seal assembly inner seal point are oppositely arranged.

Further, the number of the sealing rings is two.

Furthermore, the upper end design of refluence hole has the cambered surface, avoids hydrate direct channeling upward along the low pressure well head outside to cause harm to other equipment.

Furthermore, the top of the inner step of the casing hanger is provided with a recycling and feeding groove for taking and feeding the wear-resistant core.

Furthermore, the low-pressure well head, the high-pressure well head, the first casing hanger, the second casing hanger, the third casing hanger and the universal sealing assembly are all made of corrosion-resistant alloy steel.

The invention has the advantages and beneficial effects that: the utility model provides an increase the total bearing capacity of high pressure well head in order to satisfy the operation demand in deeper waters, satisfy ordinary operation demand and the requirement of deep water locking reinforcing bending resistance, satisfy the sealed requirement of different level sleeve pipe string annuluses simultaneously, solve anticorrosive novel deep water well head equipment of requirement.

In the design of the invention, the arc-shaped structure outside the backflow hole of the low-pressure wellhead is used for preventing the hydrate from flowing upwards; the inner side of the high-pressure wellhead head is subjected to dispersed load bearing, and the total bearing capacity of the high-pressure wellhead head is increased by the design that each layer of sleeve is hung with a bearing lock ring, so that the operation requirement of a deeper water area is met, and the requirement of corrosion resistance can be met; the rigid locking ring between the high-pressure well mouth and the low-pressure well mouth can simultaneously meet the requirements of common operation and deepwater locking and bending resistance enhancement; the universal sealing assembly can meet the sealing requirements of different layer casing string annular spaces.

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

fig. 1 is a schematic structural diagram of a novel deepwater wellhead device.

Description of the reference numerals

1. The low-pressure well head 2, the high-pressure well head 3, the high-pressure metal sealing surface 4, the high-pressure well head connecting interface 5, the locking ring groove 6, the wear-resistant bushing 7, the recovery feed-in groove 8, the first locking ring 9, the outer locking ring 10, the first high-pressure well head locking ring groove 11, the sealing assembly main body inner step 12, the top outer step 13, the sleeve padlock ring groove 14, the inner locking ring 15, the second locking ring 16, the outer sealing point 17, the high-pressure well head inner sealing surface 18, the sealing assembly inner sealing point 19, the sleeve hanger outer sealing surface 20, the sleeve hanger step 21, the sleeve hanger inner step 22, the locking ring 23, the second high-pressure well head locking ring groove 24, the locking ring support inner step 25, the locking ring support outer step 27, the supporting ring 28, the third sleeve hanger 29, the second sleeve hanger 31, the low-pressure well head upper contact surface 32, the rigid locking ring contact surface 33, the low-pressure well head upper step 34 and the first sleeve. Sealing ring 36, first low pressure wellhead inner surface 37, first wellhead hanging step surface 38, bearing step surface 39, return orifice 201, high pressure wellhead hanging step 202, low pressure wellhead hanging step 203, second low pressure wellhead inner surface 204, rigid locking ring 205, pressure ring 206, low pressure wellhead locking ring groove 207, arc surface 208, support locking ring 209, support ring 210, high pressure wellhead locking ring groove 211, locking ring bearing step 101, universal sealing assembly 103, third wellhead hanging locking ring groove

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

A novel deepwater wellhead device is disclosed, as shown in figure 1, comprising a low pressure wellhead head 1, a high pressure wellhead head 2, a first casing hanger 34, a second casing hanger 29, a third casing hanger 28, a universal seal assembly 101 and an abrasion-resistant bushing 6, wherein the low pressure wellhead head 1 is provided with a low pressure wellhead head hanging step 202, the lower part of the low pressure wellhead head hanging step 202 is provided with a return hole 39, the low pressure wellhead head 1 is also provided with a first low pressure wellhead head inner surface 36, a second low pressure wellhead head inner surface 203 and a low pressure wellhead head lock ring groove 206, the second low pressure wellhead head inner surface 203 is arranged above the first low pressure wellhead head inner surface 36, the high pressure wellhead head 2 is provided with a high pressure wellhead head hanging step 201, the upper end of the high pressure wellhead head 2 is designed with a high pressure wellhead head connection interface 4 and a high pressure metal seal surface 3, the lower end of the high pressure wellhead head 2 is provided with a bearing step surface 38, the outer side of the high pressure wellhead head 2, the high-pressure wellhead head locking ring groove 210, the first high-pressure wellhead head locking ring groove 10, the locking ring groove 5 and the second high-pressure wellhead head locking ring groove 23 are arranged on the high-pressure wellhead head 2, the second high-pressure wellhead head locking ring groove 23 is arranged above the high-pressure wellhead head locking ring groove 210, the locking ring groove 5 is arranged at the upper end of the high-pressure wellhead head 2 and below the high-pressure metal sealing surface 3, and the high-pressure wellhead head 2 is also provided with a high-pressure wellhead head inner sealing surface 17 which is used for being matched with the outer sealing point 16 to realize metal sealing; the second casing hanger 29 is provided with a support lock ring 208, the support lock ring 208 is provided with a lock ring bearing step 211, the support lock ring 208 is matched with a high-pressure wellhead head lock ring groove 210 for use, the support lock ring 208 can be locked into the high-pressure wellhead head lock ring groove 210 under the action of the support ring 209, the third casing hanger 28 is provided with a top outer step 12, a casing hanger outer sealing surface 19, a casing hanger inner step 21, and a casing hanger annular groove 13 is arranged on the outer side of the third casing hanger 28, the inner side of the third casing hanger 28 is provided with a third casing hanger annular groove 103, the outer side of the middle part of the third casing hanger 28 is also provided with a lock ring 22, and the lock ring 22 is provided with a lock ring support inner step; the general seal assembly 101 is provided with a seal assembly main body inner step 11 and a hanging step 20, the general seal assembly 101 is provided with a first lock ring 8, a second lock ring 15, an outer lock ring 9 and an inner lock ring 14, the first lock ring 8 is arranged above the outer side of the second lock ring 15, the outer side of the general seal assembly 101 is provided with an outer seal point 16, the inner side of the general seal assembly 101 is provided with a seal assembly inner seal point 18, and the outer seal point 16 and the seal assembly inner seal point 18 are arranged oppositely.

The high-pressure wellhead head 2 is hung on the low-pressure wellhead head hanging step 202 of the low-pressure wellhead head 1 through the high-pressure wellhead head hanging step 201, and the first low-pressure wellhead inner surface 36 and the second low-pressure wellhead inner surface 203 are matched with the outer side of the high-pressure wellhead 2, so that high bending resistance is provided, a rigid locking ring 204 and a low-pressure wellhead locking ring groove 206 are provided for deep water operation, a large pre-loading capacity is provided for the rigid locking ring 204 under the action of a pressure ring 205, and the bending resistance of the high-pressure wellhead 2 is enhanced, the bending stress on the high-pressure wellhead head 2 is directly transferred to the upper surface of the low-pressure wellhead head 1, so that the bending resistance of the whole wellhead is enhanced, the two sealing rings 35 are additionally arranged on the outer side of the high-pressure wellhead and are matched with the inner surface 36 of the first low-pressure wellhead, so that hydrates are prevented from moving upwards to enter cavities of the high-pressure wellhead and the low-pressure wellhead, and damage is caused. A backflow hole 39 is formed in the lower portion of a low-pressure wellhead head hanging step 202 of the low-pressure wellhead head 1 according to operation requirements, an arc surface 207 convenient for hydrate dispersion is designed at the upper end of the backflow hole 39, and damage to other equipment caused by the fact that hydrates directly move upwards along the outer side of the low-pressure wellhead head 1 is avoided.

the high-pressure wellhead 2 is a core component of wellhead equipment, and the upper end of the high-pressure wellhead is provided with a high-pressure wellhead connecting interface 4 connected with other equipment and a matched high-pressure metal sealing surface 3, so that a sealed high-pressure cavity can be formed with other equipment. The high-pressure well head connecting interface 4 can be designed differently according to the requirements of customers, and at the lower end bearing step surface 38 of the high-pressure well head 2, materials consistent with the materials of the body can be adopted, because the set of well head equipment adopts each layer of sleeve hanger with a bearing ring, the bearing load is dispersed and borne, and the bearing step surface 38 only bears the weight of the first sleeve hanger 34 carrying the sleeve and the load when the universal sealing assembly 101 is subjected to pressure testing. On the second casing hanger 29 is mounted its own support lock ring 208 and during lowering the support ring 209 is activated so that the support lock ring 208 locks into the high pressure wellhead lock ring groove 210 of the high pressure wellhead 2. The second casing hanger 29 now carries the casing weight and can carry the load through the lock ring bearing step 211 of the support lock ring 208, sitting the weight entirely on the support lock ring 208 and then passing through the support lock ring 208 into the high pressure wellhead head 2. The top of the first casing hanger 34 does not bear any load, the third casing hanger 28 is also locked into the lock ring groove 23 of the high-pressure wellhead head 2 through the lock ring 22, the support step 24 matched with the lock ring 22 is also used for transmitting the weight of the casing hanger 28 and the carrying sleeve directly to the body of the high-pressure wellhead head 2 through the lock ring 22 by the action of touching the support ring 27 during the lowering process, and the top of the second casing hanger 29 does not bear any load.

In the design process, in consideration of the universality of equipment, the universal annular seal assembly 101 used by people adopts the same design between each layer of casing hanger and the high-pressure wellhead head 2, the universal seal assembly 101 is pressed into place in a gravity lowering mode, so that the inner seal point 18 of the seal assembly and the outer seal surface 19 of the casing hanger realize metal seal, while the outer sealing point 16 of the universal seal assembly 101 and the high-pressure wellhead inner sealing surface 17 of the high-pressure wellhead 2 realize metal sealing, in order to ensure that the universal seal assembly 101 is locked between the casing hanger and the high-pressure wellhead head 2, an inner locking ring 14 is designed to be matched with a casing padlock ring groove 13, an outer locking ring 9 is designed to be matched with a first high-pressure wellhead head padlock ring groove 10 of the high-pressure wellhead head 2, both lock rings are pressed down by the running tool with the first lock ring 8 of the universal seal assembly 101, simultaneously effecting a locking action of both lock rings. The universal seal assembly 101 is pressed into place by pressing the seal assembly main body inner step 11 into place on the top outer step 12 of the casing hanger.

After each layer of casing hanger and seal assembly is installed in place, the wear-resistant bushing 6 for protecting the inner seal surface is installed, the wear-resistant bushing 6 shown in fig. 1 is used after the third casing hanger 28 and the universal seal assembly 101 are installed, the wear-resistant bushing 6 is hung on the inner step 21 of the casing hanger of the third casing hanger 28 through the hanging step 20, and is locked in the third casing hanger locking ring groove 103 of the third casing hanger 28 through the second locking ring 15 to be fixed. The top of the anti-wear supplementary core 6 is provided with a recovery feeding groove 7 which is mainly used for taking and feeding the anti-wear supplementary core 6. The upper part of the inner side of the high-pressure wellhead head 2 is provided with a lock ring groove 5 which is mainly used for a feeding tool to be recovered and fed into the high-pressure wellhead head 2 and can also be used for locking and developing a tubing hanger.

The low-pressure wellhead head 1, the high-pressure wellhead head 2, the first casing hanger 34, the second casing hanger 29, the third casing hanger 28 and the universal seal assembly 101 are all made of corrosion-resistant alloy steel.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.