CN102854088B - A device and method for fast density measurement of foamed cement slurry - Google Patents
A device and method for fast density measurement of foamed cement slurry Download PDFInfo
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- CN102854088B CN102854088B CN201110180162.4A CN201110180162A CN102854088B CN 102854088 B CN102854088 B CN 102854088B CN 201110180162 A CN201110180162 A CN 201110180162A CN 102854088 B CN102854088 B CN 102854088B
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Abstract
The invention discloses a device for fast density measurement of foamed cement slurry, including a cup body, an upper cover, a lower cover, a piston and a pressure system, the pressure system includes a handwheel, a screw nut and a screw rod, the screw rod has one end inserted into the cup body to connect with the piston, the other end inserted into the screw nut to connect with the handwheel, the handwheel rotates to drive the screw rod to move to realize reciprocating movement of the piston in the cup body; the screw nut is fixed on the upper cover; the center of the lower cover is set with a slurry inlet. The method includes pouring the cement slurry to be measured into the cup body, rotating the handwheel to slowly withdraw the screw rod till the cup body is full of the cement slurry, calculating density. By adopting the inventive device and method, the invention realizes measurement of the density of the foamed cement slurry in closed condition under pressure, and simple and convenient operation.
Description
Technical field
The present invention relates to drilling applications, say further, relate to a kind of Quick density measuring device for foam cement slurry and measuring method.
Background technology
Oil field at home majority enters mid-later development phase, the quantity showed increased of deep-well and ultra deep well.The well cementing operation difficulty of the low pressure and easy leaking in deep-well, long open hole, long cementing interval, multi pressure series of strata strengthens, and often needs to adopt high-performance low-density cement mortar to carry out sealing.In common well cementing operation, general drift pearl and the flyash of adopting mixes with cement as lightening material.But due to mixing of lightening material, system stability is poor, fluid loss is difficult to problems such as controlling, intensity is low, perviousness is high to have caused grout to occur.In recent years, compared with other low-density cement mortars, foamed cement cost is low, and has obvious technical advantage, has larger promotional value.
Foamed cement refers to and be mixed into a certain amount of foam in conventional cement slurries, forms solid, liquid, gas three-phase and has the heterogeneous system of high dispersion.Foamed cement well cementation mainly reduces cement slurry density, thus reduces the fluid column pressure of annular space grout section, to solve the well cementation leakage problem of low pressure and easy leaking oil reservoir, and plays the effect of formation protection.The research that foamed cement carries out cementing operation at home starts from 1985, and achieve successfully in Xinjiang Oilfield at first, in succession be able to research and development in the long cementing interval well cementation and Absorption Wells of Low Pressure well cementation of telling the oil field such as Kazakhstan, long Khanh Hoa Qinghai subsequently, be wherein mainly used widely in low pressure and easy leaking lost territory layer, thickened oil recovery well and the leak stopping of anti-gas channeling well, cementing operation etc.Each oil field domestic to the research contents of foamed cement with similar abroad, be all mainly concentrate on the aspects such as foam slurry compound method, construction method, technological process and relevant well cementation theory, but also there is certain gap compared with abroad on the range of investigation and application.
Foam slurry is by solid phase cement granules, the heterogeneous system of the material such as water and gas composition.In this heterogeneous system, gas is compressible, and the change of its volume is by pressure and temperature effect.In foam slurry, the pressure change of gas, must have influence on the change of cement slurry density; The change of cement slurry density, affects the change of fluid column pressure again; The change of fluid column pressure, affects again the volume of gas and the density of the soaked mud of foam conversely.
The impact be stressed due to foamed cement pulp density is very large, therefore common densitometer can not react foam slurry real density under stress situations, in foam cementing cementing practice process, foam slurry whole process is with pressure, because foam slurry has compressibility, the impact that density is stressed is very large, along with pressure increases density also in increase, therefore to measure the density of on-the-spot foam slurry really, need carry out under airtight condition with pressure.Current domestic measurement foamed cement pulp density multipurpose liquid densitometer; this device is lever liquidensitometer; measuring accuracy is easily affected because of chi bar, support sword and rider deformation damage; and during foamed cement pulp density with this densimeter measurement; can only by band pressure condition foam slurry earth pressure release after under atmospheric pressure state density measurement; so often can make foam slurry lather collapse after pressure sharply discharges; density reduces, and measures foamed cement pulp density under cannot truly realizing airtight condition with pressure online.
Therefore need to develop a set of Density Measuring Instrument that can meet under operation pressure condition, carry out the situation of change of authentic testing foam slurry in different construction conditions lower density.
Summary of the invention
For solving problems of the prior art, the invention provides a kind of Quick density measuring device for foam cement slurry and measuring method.Foamed cement pulp density is measured under can realizing airtight condition with pressure.
An object of the present invention is to provide a kind of Quick density measuring device for foam cement slurry.
Comprise: cup 10, upper cover 5, lower cover 11, piston 12 and pressure preparation system, described upper cover 5 and lower cover 11 are arranged at cup 10 two ends respectively, are threaded connection with cup 10, and piston 12 is arranged in cup 10, coordinate with cup 10 inwall.
Described pressure preparation system comprises handwheel 1, screw 2 and screw mandrel 3, and described screw mandrel 3 one end is inserted in cup 10 and is connected with piston 12, and the other end inserts in screw 2 and is connected with handwheel 1, is moved, make piston 12 to-and-fro movement in cup 10 by handwheel 1 rotating band movable wire bar 3;
Described screw 2 is fixed on and covers; Described lower cover 11 central authorities are provided with stock inlet.
Described screw 2 is fixed on upper cover 5 by screw web joint 13, screw 2 overcoat screw web joint 13, and screw web joint 13 is annular slab, and screw web joint 13 is close to upper cover 5 and is fixedly connected with upper cover 5, connects preferably by screw;
Described screw mandrel 3 one end is inserted in screw mandrel adapter sleeve 6, is fixedly connected with screw mandrel adapter sleeve 6, and preferred weld connects; Screw mandrel 3 is connected with piston 12 by screw mandrel adapter sleeve 6;
Thrust bearing 8 and back-up ring 7 is provided with between described screw mandrel adapter sleeve 6 and piston 12; Screw mandrel adapter sleeve 6 is stuck in piston by thrust bearing 8 and back-up ring 7, makes piston can to-and-fro movement together with screw mandrel, and during work, screw mandrel adapter sleeve can directly insert in thrust bearing, and the effect of back-up ring prevents thrust bearing from departing from piston;
O-ring seal 9 is provided with between described cup 10 and lower cover 11;
Described cup 10 can preferably clear corrosion-resistant pressure-resistant material obtain, be convenient to observe, the shape of cup can be various regular shape, preferably drum shape; Cup 10 outer wall, with scale, can read the volume of foam slurry by scale; The height of cup 10 and thickness can set as the case may be, can preferred heights be 100-150mm in the present invention; Thickness is 8-12mm.
Two of object of the present invention is to provide a kind of foam slurry fast density measuring method.
Comprise:
(1) be injected in cup by foam slurry by stock inlet, foam slurry with pressure promotes bottom piston and moves upward;
(2) shake handwheel, exit screw mandrel, the standby pressure of slow release, makes foam slurry slowly evenly can inject cup; The pressure of foam slurry will have slight change in injection process, only has and just can be injected in cup by the certain pressure reduction foam slurry of the standby pressure generation of slow release;
(3) piston retreats to upper cover place, and foam slurry fills cup, weighs, and according to the volume of cup, measures the foam slurry density value under this pressure condition;
In step (2), the rate travel of described screw mandrel is 1 ~ 3mm/s.
Wherein, described standby pressure refers to that tightly suppressing piston by screw rod in advance makes system pressure remain unchanged, otherwise piston can return to the other end rapidly under the effect of system pressure, although it is still identical with system pressure that this is the pressure of sampler inside, but have most of gas in sampler to occur, the density of grout cannot be judged.By the slow movement of screw mandrel, both ensured system pressure constant (because pressure in same pressure system is everywhere equal), it also avoid the generation of gas.
The present invention is by a kind of device testing the variable density situation of foam slurry under airtight condition with pressure fast, by the foam slurry with pressure of stirring apparatus mixture, utilize rapid-acting coupling, inject the graduated cup of band, then close the valve of rapid-acting coupling, take off cup, due to the volume of known cup, as long as each weight weighing cup, just can learn the density of the foam slurry under airtight condition.
Compared with prior art, the invention has the beneficial effects as follows:
(1) cup cylinder all adopts corrosion-resistant, anti abrasive pmma material, one be lightweight, two be convenient to observe;
(2) device of the application of the invention, under the condition of pressure 0-0.8Mpa, can carry out the density measure of foam slurry with pressure in the internal volume of volume 200-400ml;
(3) utilize this device can the execution conditions of simulated field foam cementing, in airtight situation with pressure, provide a kind of device of measurement foamed cement variable density situation directly perceived, on-line measurement foamed cement pulp density;
(4) accuracy that detects the performance evaluation of simulated field foam slurry of this device is high, and experimental implementation is simple and easy to do.
Accompanying drawing explanation
Fig. 1 Quick density measuring device for foam cement slurry of the present invention
Description of reference numerals:
1-handwheel; 2-screw; 3-screw mandrel; 4-screw; 5-upper cover; 6-screw mandrel adapter sleeve;
7-back-up ring; 8-thrust bearing; 9-O-ring seal; 10-cup; 11-lower cover;
12-piston; 13-screw web joint; A-stock inlet
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
Embodiment:
As shown in Figure 1, a kind of Quick density measuring device for foam cement slurry, comprise: cup 10, upper cover 5, lower cover 11, piston 12 and pressure preparation system, described upper cover 5 and lower cover 11 are arranged at cup 10 two ends respectively, be threaded with cup 10, piston 12 is arranged in cup 10, coordinates with cup 10 inwall
Described pressure preparation system comprises handwheel 1, screw 2 and screw mandrel 3, and described screw mandrel 3 one end is inserted in cup 10 and is connected with piston 12, and the other end inserts in screw 2 and is connected with handwheel 1, is moved, make piston 12 to-and-fro movement in cup 10 by handwheel 1 rotating band movable wire bar 3;
Described screw 2 is fixed on and covers; Described lower cover 11 central authorities are provided with stock inlet.
Described screw 2 is fixed on upper cover 5 by screw web joint 13, screw 2 overcoat screw web joint 13, and screw web joint 13 is annular slab, and screw web joint 13 is close to upper cover 5 and is fixedly connected with by screw with upper cover 5;
Described screw mandrel 3 one end is inserted in screw mandrel adapter sleeve 6, is welded to connect with screw mandrel adapter sleeve 6; Described screw mandrel 3 is connected with piston 12 by screw mandrel adapter sleeve 6;
Thrust bearing 8 and back-up ring 7 is provided with between described screw mandrel adapter sleeve 6 and piston 12; Screw mandrel adapter sleeve 6 is stuck in piston by thrust bearing 8 and back-up ring 7, makes piston can to-and-fro movement together with screw mandrel,
O-ring seal 9 is provided with between described cup 10 and lower cover 11;
Described cup 10 is transparent cylindrical shape, and cup material is organic glass; Cup 10 outer wall is with scale, and cup volume is 300ml, the height 100mm of cup, thickness 10mm.
Test 1
Foam slurry is slowly injected the cup of the measurement mechanism described in embodiment with 0.45MPa pressure from stock inlet bottom bottom end cover, simultaneously by shake handwheel, exit screw mandrel, the speed of screw mandrel is 1.5mm/s, slow release pressure, makes foam slurry slowly can inject sampler, when piston top is set up lid place, to decorporate gradually screw and wire cover, close the valve into slurry, weigh, remove container weight, foam slurry net weight 366g, by formula r=G/V, learns foamed cement pulp density 1.22g/cm
3.
Test 2
Foam slurry is slowly injected the cup of the measurement mechanism described in embodiment from stock inlet bottom bottom end cover with 0.65MPa pressure, simultaneously by shake handwheel, exit screw mandrel, the speed of screw mandrel is 2.5mm/s slow release pressure, makes foam slurry slowly can inject sampler, when piston top is set up lid place, to decorporate gradually screw and wire cover, close the valve into slurry, weigh net weight 429g, by formula r=G/V, learn foamed cement pulp density 1.43g/cm
3.
Claims (9)
1. a Quick density measuring device for foam cement slurry, comprise: cup (10), upper cover (5), lower cover (11), piston (12) and pressure preparation system, described upper cover (5) and lower cover (11) are arranged at cup (10) two ends respectively, be threaded with cup (10), piston (12) is arranged in cup (10), coordinate with cup (10) inwall, it is characterized in that:
Described pressure preparation system comprises handwheel (1), screw (2) and screw mandrel (3), described screw mandrel (3) one end is inserted in cup (10) and is connected with piston (12), the other end inserts in screw (2) and is connected with handwheel (1), mobile by handwheel (1) rotating band movable wire bar (3), make piston (12) to-and-fro movement in cup (10);
Described screw (2) is fixed on and covers; Described lower cover (11) central authorities are provided with stock inlet;
Described screw (2) is fixed on upper cover (5) by screw web joint (13), screw (2) overcoat screw web joint (13), screw web joint (13) is annular slab, and screw web joint (13) is close to upper cover (5) and is fixedly connected with upper cover (5);
Described screw mandrel (3) one end is inserted in screw mandrel adapter sleeve (6), is fixedly connected with screw mandrel adapter sleeve (6); Screw mandrel (3) is connected with piston (12) by screw mandrel adapter sleeve (6);
Thrust bearing (8) and back-up ring (7) is provided with between described screw mandrel adapter sleeve (6) and piston (12); Screw mandrel adapter sleeve (6) is stuck in piston by thrust bearing (8) and back-up ring (7).
2. Quick density measuring device for foam cement slurry as claimed in claim 1, is characterized in that:
Described screw web joint (13) and upper cover (5) are connected by screw.
3. Quick density measuring device for foam cement slurry as claimed in claim 1, is characterized in that:
Described screw mandrel (3) and screw mandrel adapter sleeve (6) are welded to connect.
4. the Quick density measuring device for foam cement slurry as described in one of claims 1 to 3, is characterized in that:
Described cup (10) is transparent cylindrical shape, and cup material is corrosion-resistant pressure-resistant material.
5. Quick density measuring device for foam cement slurry as claimed in claim 4, is characterized in that:
O-ring seal (9) is provided with between described cup (10) and lower cover (11).
6. Quick density measuring device for foam cement slurry as claimed in claim 1, is characterized in that:
Described cup (10) outer wall is with scale.
7. Quick density measuring device for foam cement slurry as claimed in claim 1, is characterized in that:
Described cup (10) is highly 100-150mm; Thickness is 8-12mm.
8. adopt a measuring method for the Quick density measuring device for foam cement slurry as described in one of claim 1 ~ 7, it is characterized in that comprising the following steps:
(1) be injected in cup by foam slurry by stock inlet, foam slurry with pressure promotes bottom piston and moves upward;
(2) shake handwheel, exit screw mandrel, the standby pressure of slow release, makes foam slurry slowly evenly can inject cup;
(3) piston retreats to upper cover place, and foam slurry fills cup, weighs, and according to the volume of cup, measures the foam slurry density value under this pressure condition.
9. measuring method as claimed in claim 8, is characterized in that:
In step (2), the rate travel of described screw mandrel is 1 ~ 3mm/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110180162.4A CN102854088B (en) | 2011-06-29 | 2011-06-29 | A device and method for fast density measurement of foamed cement slurry |
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| CN201110180162.4A CN102854088B (en) | 2011-06-29 | 2011-06-29 | A device and method for fast density measurement of foamed cement slurry |
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| CN102854088B true CN102854088B (en) | 2015-07-15 |
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| CN103967484A (en) * | 2014-04-24 | 2014-08-06 | 黑龙江高仕达通用机械制造有限公司 | Piston type unloading-free sampling device |
| CN104502059B (en) * | 2014-12-02 | 2017-07-04 | 中国石油大学(华东) | Foam stabilization system safety testing device and method of work under a kind of pressure oscillation |
| CN112782037B (en) * | 2019-11-07 | 2023-07-25 | 中国石油化工股份有限公司 | Device and method for evaluating compression performance of foam cement slurry |
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| CN202141664U (en) * | 2011-06-29 | 2012-02-08 | 中国石油化工股份有限公司 | Quick density measuring device for foam cement slurry |
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Application publication date: 20130102 Assignee: SJS Ltd. Assignor: SINOPEC Research Institute OF PETROLEUM ENGINEERING Contract record no.: X2022980000637 Denomination of invention: A fast density measuring device and measuring method for foamed cement slurry Granted publication date: 20150715 License type: Exclusive License Record date: 20220118 |
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